U.S. patent application number 16/877371 was filed with the patent office on 2020-11-26 for cross-slot scheduling for cross numerology.
The applicant listed for this patent is QUALCOMM Incorporated. Invention is credited to Peter Pui Lok Ang, Olufunmilola Omolade Awoniyi-Oteri, Wooseok Nam, Gabi Sarkis, Huilin Xu.
Application Number | 20200374918 16/877371 |
Document ID | / |
Family ID | 1000004852456 |
Filed Date | 2020-11-26 |
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United States Patent
Application |
20200374918 |
Kind Code |
A1 |
Ang; Peter Pui Lok ; et
al. |
November 26, 2020 |
CROSS-SLOT SCHEDULING FOR CROSS NUMEROLOGY
Abstract
Methods, systems, and devices for wireless communications are
described. A user equipment (UE) may identify a scheduling offset
threshold corresponding to a cross-slot grant. The UE may monitor a
control channel in a first slot for the cross-slot grant, the
control channel having a first numerology that is different than a
second numerology of a shared channel and determine a beginning
slot defined in the second numerology based on interpreting the
scheduling offset threshold as being defined in the first
numerology or the second numerology. The UE may then enter a low
power state, or communicating a data transmission, during the
beginning slot based on whether the cross-slot grant is
detected
Inventors: |
Ang; Peter Pui Lok; (San
Diego, CA) ; Xu; Huilin; (San Diego, CA) ;
Nam; Wooseok; (San Diego, CA) ; Sarkis; Gabi;
(San Diego, CA) ; Awoniyi-Oteri; Olufunmilola
Omolade; (San Diego, CA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
QUALCOMM Incorporated |
San Diego |
CA |
US |
|
|
Family ID: |
1000004852456 |
Appl. No.: |
16/877371 |
Filed: |
May 18, 2020 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
62852959 |
May 24, 2019 |
|
|
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04W 72/1289 20130101;
H04W 24/08 20130101; H04W 52/0229 20130101; H04W 72/0446 20130101;
H04L 1/1642 20130101; H04W 72/14 20130101 |
International
Class: |
H04W 72/14 20060101
H04W072/14; H04W 72/04 20060101 H04W072/04; H04W 24/08 20060101
H04W024/08; H04L 1/16 20060101 H04L001/16; H04W 72/12 20060101
H04W072/12; H04W 52/02 20060101 H04W052/02 |
Claims
1. A method for wireless communications by a user equipment (UE),
comprising: identifying a scheduling offset threshold corresponding
to a cross-slot grant; monitoring a control channel in a first slot
for the cross-slot grant, the control channel having a first
numerology that is different than a second numerology of a shared
channel; determining a beginning slot defined in the second
numerology based at least in part on the scheduling offset
threshold; and operating in a low power state, or communicating a
data transmission, during the beginning slot based at least in part
on whether the cross-slot grant is detected.
2. The method of claim 1, wherein identifying the scheduling offset
threshold comprises: retrieving a plurality of different candidate
scheduling offset thresholds from local storage of the UE, the
plurality of different candidate scheduling offset thresholds being
preconfigured; and receiving layer one control signaling indicating
the scheduling offset threshold from the plurality of different
candidate scheduling offset thresholds.
3. The method of claim 1, further comprising: receiving the
cross-slot grant in a downlink bandwidth part having the first
numerology, the cross-slot grant scheduling the data transmission
as an uplink transmission on the shared channel in an active uplink
bandwidth part having the second numerology.
4. The method of claim 1, further comprising: receiving the
cross-slot grant in a downlink bandwidth part having the first
numerology, the cross-slot grant scheduling the data transmission
as a downlink transmission on the shared channel in a target
downlink bandwidth part having the second numerology.
5. The method of claim 1, wherein determining the beginning slot
comprises: converting the scheduling offset threshold to a second
scheduling offset threshold in the second numerology, the
scheduling offset threshold being defined in the first numerology;
and determining the beginning slot based at least in part on the
second scheduling offset threshold.
6. The method of claim 1, further comprising: receiving the
cross-slot grant via a first component carrier that is defined in
the first numerology, the cross-slot grant scheduling the data
transmission on the shared channel via a second component carrier
that is defined in the second numerology.
7. The method of claim 1, wherein the scheduling offset threshold
indicates a number of slots defined in the second numerology.
8. The method of claim 1, wherein the scheduling offset threshold
indicates a number of symbol periods defined in the second
numerology.
9. A method for wireless communications by a base station,
comprising: transmitting control signaling that indicates a
scheduling offset threshold corresponding to a cross-slot grant;
transmitting, in a first slot, the cross-slot grant in a control
channel that has a first numerology that is different than a second
numerology of a shared channel; determining a beginning slot in the
second numerology based at least in part on the scheduling offset
threshold; and transmitting or receiving a data transmission during
the beginning slot based at least in part on the cross-slot
grant.
10. The method of claim 9, wherein transmitting the control
signaling comprises: transmitting layer one control signaling
indicating the scheduling offset threshold from a plurality of
different candidate scheduling offset thresholds.
11. The method of claim 9, wherein transmitting the cross-slot
grant comprises: transmitting the cross-slot grant in a downlink
bandwidth part having the first numerology, the cross-slot grant
scheduling the data transmission as an uplink transmission on the
shared channel in an active uplink bandwidth part having the second
numerology.
12. The method of claim 9, wherein transmitting the cross-slot
grant comprises: transmitting the cross-slot grant in a downlink
bandwidth part having the first numerology, the cross-slot grant
scheduling the data transmission as a downlink transmission on the
shared channel in a target uplink bandwidth part having the second
numerology.
13. The method of claim 9, wherein determining the beginning slot
comprises: converting the scheduling offset threshold to a second
scheduling offset threshold in the second numerology, the
scheduling offset threshold being defined in the first numerology;
and determining the beginning slot based at least in part on the
second scheduling offset threshold.
14. The method of claim 9, wherein transmitting the cross-slot
grant comprises: transmitting the cross-slot grant via a first
component carrier that is defined in the first numerology, the
cross-slot grant scheduling the data transmission on the shared
channel via a second component carrier that is defined in the
second numerology.
15. The method of claim 9, wherein the scheduling offset threshold
indicates a number of slots defined in the first numerology.
16. The method of claim 9, wherein the scheduling offset threshold
indicates a number of symbol periods defined in the second
numerology.
17. An apparatus for wireless communications by a user equipment
(UE), comprising: a processor, memory coupled with the processor;
and instructions stored in the memory and executable by the
processor to cause the apparatus to: identify a scheduling offset
threshold corresponding to a cross-slot grant; monitor a control
channel in a first slot for the cross-slot grant, the control
channel having a first numerology that is different than a second
numerology of a shared channel; determine a beginning slot defined
in the second numerology based at least in part on the scheduling
offset threshold; and operate in a low power state, or communicate
a data transmission, during the beginning slot based at least in
part on whether the cross-slot grant is detected.
18. The apparatus of claim 17, wherein the instructions to identify
the scheduling offset threshold comprise instructions that are
further executable by the processor to cause the apparatus to:
retrieve a plurality of different candidate scheduling offset
thresholds from local storage of the UE, the plurality of different
candidate scheduling offset thresholds being preconfigured; and
receive layer one control signaling indicating the scheduling
offset threshold from the plurality of different candidate
scheduling offset thresholds.
19. The apparatus of claim 17, wherein the instructions are further
executable by the processor to cause the apparatus to: receive the
cross-slot grant in a downlink bandwidth part having the first
numerology, the cross-slot grant scheduling the data transmission
as an uplink transmission on the shared channel in an active uplink
bandwidth part having the second numerology.
20. The apparatus of claim 17, wherein the instructions are further
executable by the processor to cause the apparatus to: receive the
cross-slot grant in a downlink bandwidth part having the first
numerology, the cross-slot grant scheduling the data transmission
as a downlink transmission on the shared channel in a target
downlink bandwidth part having the second numerology.
21. The apparatus of claim 17, wherein the instructions to
determine the beginning slot comprise instructions that are further
executable by the processor to cause the apparatus to: convert the
scheduling offset threshold to a second scheduling offset threshold
in the second numerology, the scheduling offset threshold being
defined in the first numerology; and determine the beginning slot
based at least in part on the second scheduling offset
threshold.
22. The apparatus of claim 17, wherein the instructions are further
executable by the processor to cause the apparatus to: receive the
cross-slot grant via a first component carrier that is defined in
the first numerology, the cross-slot grant scheduling the data
transmission on the shared channel via a second component carrier
that is defined in the second numerology.
23. The apparatus of claim 17, wherein the scheduling offset
threshold indicates a number of slots defined in the second
numerology.
24. An apparatus for wireless communications by a base station,
comprising: a processor, memory coupled with the processor; and
instructions stored in the memory and executable by the processor
to cause the apparatus to: transmit control signaling that
indicates a scheduling offset threshold corresponding to a
cross-slot grant; transmit, in a first slot, the cross-slot grant
in a control channel that has a first numerology that is different
than a second numerology of a shared channel; determine a beginning
slot in the second numerology based at least in part on the
scheduling offset threshold; and transmit or receiving a data
transmission during the beginning slot based at least in part on
the cross-slot grant.
25. The apparatus of claim 24, wherein the instructions to transmit
the control signaling comprise instructions that are further
executable by the processor to cause the apparatus to: transmit
layer one control signaling indicating the scheduling offset
threshold from a plurality of different candidate scheduling offset
thresholds.
26. The apparatus of claim 24, wherein the instructions to transmit
the cross-slot grant comprise instructions that are further
executable by the processor to cause the apparatus to: transmit the
cross-slot grant in a downlink bandwidth part having the first
numerology, the cross-slot grant scheduling the data transmission
as an uplink transmission on the shared channel in an active uplink
bandwidth part having the second numerology.
27. The apparatus of claim 24, wherein the instructions to transmit
the cross-slot grant comprise instructions that are further
executable by the processor to cause the apparatus to: transmit the
cross-slot grant in a downlink bandwidth part having the first
numerology, the cross-slot grant scheduling the data transmission
as a downlink transmission on the shared channel in a target uplink
bandwidth part having the second numerology.
28. The apparatus of claim 24, wherein the instructions to
determine the beginning slot comprise instructions that are further
executable by the processor to cause the apparatus to: convert the
scheduling offset threshold to a second scheduling offset threshold
in the second numerology, the scheduling offset threshold being
defined in the first numerology; and determine the beginning slot
based at least in part on the second scheduling offset
threshold.
29. The apparatus of claim 24, wherein the instructions to transmit
the cross-slot grant comprise instructions that are further
executable by the processor to cause the apparatus to: transmit the
cross-slot grant via a first component carrier that is defined in
the first numerology, the cross-slot grant scheduling the data
transmission on the shared channel via a second component carrier
that is defined in the second numerology.
30. The apparatus of claim 24, wherein the scheduling offset
threshold indicates a number of slots defined in the second
numerology.
Description
CROSS REFERENCE
[0001] The present Application for Patent claims the benefit of
U.S. Provisional Patent Application No. 62/852,959 by ANG et al.,
entitled "CROSS-SLOT SCHEDULING FOR CROSS NUMEROLOGY," filed May
24, 2019, assigned to the assignee hereof, and expressly
incorporated by reference herein.
BACKGROUND
[0002] The following relates generally to wireless communications,
and more specifically to cross-slot scheduling for cross
numerology.
[0003] Wireless communications systems are widely deployed to
provide various types of communication content such as voice,
video, packet data, messaging, broadcast, and so on. These systems
may be capable of supporting communication with multiple users by
sharing the available system resources (e.g., time, frequency, and
power). Examples of such multiple-access systems include fourth
generation (4G) systems such as Long Term Evolution (LTE) systems,
LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth
generation (5G) systems which may be referred to as New Radio (NR)
systems. These systems may employ technologies such as code
division multiple access (CDMA), time division multiple access
(TDMA), frequency division multiple access (FDMA), orthogonal
frequency division multiple access (OFDMA), or discrete Fourier
transform spread orthogonal frequency division multiplexing
(DFT-S-OFDM). A wireless multiple-access communications system may
include a number of base stations or network access nodes, each
simultaneously supporting communication for multiple communication
devices, which may be otherwise known as user equipment (UE).
[0004] A UE may support communications with a base station using
one or more numerologies. Scheduling techniques based on two or
more different numerologies may have some deficiencies that can be
improved.
SUMMARY
[0005] The described techniques relate to improved methods,
systems, devices, and apparatuses that support cross-slot
scheduling for cross numerology. Generally, the described
techniques provide for a user equipment (UE) to determine whether
to operate in a low power state or to communicate data on a shared
channel. The UE may be configured with one or more component
carriers or bandwidth parts (BWPs), or both, according to a carrier
aggregation configuration. Some carriers may be configured for
uplink transmissions, downlink transmissions, or both uplink and
downlink. In some cases, two carriers configured for the UE may
have different subcarrier spacings (SCSs). The UE may be capable of
operating in a lower power mode when not scheduled for a
transmission. For example, if the UE knows ahead of time the range
of symbols which are not scheduled for a transmission, the UE may
put some of its antenna, radio frequency (RF) hardware, or
front-end hardware into a power saving mode for that range of
symbols.
[0006] To support an extended duration of the UE being in the power
saving mode, the UE and base station may implement techniques to
enhance cross-slot scheduling by using a minimum scheduling offset.
For example, a minimum downlink scheduling offset may control the
minimum gap between a downlink control channel and a downlink
shared channel that the UE is expected to handle for downlink
shared channel scheduling. These techniques may be described with
reference to cross-slot scheduling slots that may have different
numerologies. These techniques may remove ambiguity in how the UE
could interpret the minimum scheduling offset when the scheduling
downlink control channel has a different numerology than the shared
channel. Using the techniques described herein, the UE may
interpret the minimum scheduling offset and determine a first slot,
or a beginning slot, on a shared channel which could be scheduled
by a grant transmitted on a downlink control channel. The UE may
then determine to either operate in a low power state or to
communicate data on the shared channel based on whether the UE
received a grant scheduling the UE for a transmission.
[0007] A method of wireless communications by a UE is described.
The method may include identifying a scheduling offset threshold
corresponding to a cross-slot grant, monitoring a control channel
in a first slot for the cross-slot grant, the control channel
having a first numerology that is different than a second
numerology of a shared channel, determining a beginning slot
defined in the second numerology based on the scheduling offset
threshold, and operating in a low power state, or communicating a
data transmission, during the beginning slot based on whether the
cross-slot grant is detected.
[0008] An apparatus for wireless communications by a UE is
described. The apparatus may include a processor, memory coupled
with the processor, and instructions stored in the memory. The
instructions may be executable by the processor to cause the
apparatus to identify a scheduling offset threshold corresponding
to a cross-slot grant, monitor a control channel in a first slot
for the cross-slot grant, the control channel having a first
numerology that is different than a second numerology of a shared
channel, determine a beginning slot defined in the second
numerology based on the scheduling offset threshold, and operate in
a low power state, or communicating a data transmission, during the
beginning slot based on whether the cross-slot grant is
detected.
[0009] Another apparatus for wireless communications by a UE is
described. The apparatus may include means for identifying a
scheduling offset threshold corresponding to a cross-slot grant,
monitoring a control channel in a first slot for the cross-slot
grant, the control channel having a first numerology that is
different than a second numerology of a shared channel, determining
a beginning slot defined in the second numerology based on the
scheduling offset threshold, and operating in a low power state, or
communicating a data transmission, during the beginning slot based
on whether the cross-slot grant is detected.
[0010] A non-transitory computer-readable medium storing code for
wireless communications by a UE is described. The code may include
instructions executable by a processor to identify a scheduling
offset threshold corresponding to a cross-slot grant, monitor a
control channel in a first slot for the cross-slot grant, the
control channel having a first numerology that is different than a
second numerology of a shared channel, determine a beginning slot
defined in the second numerology based on the scheduling offset
threshold, and operate in a low power state, or communicating a
data transmission, during the beginning slot based on whether the
cross-slot grant is detected.
[0011] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein,
identifying the scheduling offset threshold may include operations,
features, means, or instructions for retrieving a set of different
candidate scheduling offset thresholds from local storage of the
UE, the set of different candidate scheduling offset thresholds
being preconfigured, and receiving layer one control signaling
indicating the scheduling offset threshold from the set of
different candidate scheduling offset thresholds.
[0012] Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for interpreting the
scheduling offset threshold as being defined in the first
numerology or the second numerology based on a preconfiguration or
received control signaling.
[0013] Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for receiving the
cross-slot grant in a downlink bandwidth part having the first
numerology, the cross-slot grant scheduling the data transmission
as an uplink transmission on the shared channel in an active uplink
bandwidth part having the second numerology.
[0014] Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for switching from a
first uplink bandwidth part to the active uplink bandwidth part
based on receiving the cross-slot grant.
[0015] Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for receiving the
cross-slot grant in a downlink bandwidth part having the first
numerology, the cross-slot grant scheduling the data transmission
as a downlink transmission on the shared channel in a target
downlink bandwidth part having the second numerology.
[0016] Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for switching from a
first downlink bandwidth part to the target downlink bandwidth part
based on receiving the cross-slot grant.
[0017] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein,
determining the beginning slot may include operations, features,
means, or instructions for converting the scheduling offset
threshold to a second scheduling offset threshold in the second
numerology, the scheduling offset threshold being defined in the
first numerology, and determining the beginning slot based on the
second scheduling offset threshold.
[0018] Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for receiving the
cross-slot grant via a first component carrier that may be defined
in the first numerology, the cross-slot grant scheduling the data
transmission on the shared channel via a second component carrier
that may be defined in the second numerology.
[0019] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, entering
the low power state or communicating the data transmission may
include operations, features, means, or instructions for entering
the low power state based on determining that the cross-slot grant
may have not been detected.
[0020] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, entering
the low power state or communicating the data transmission may
include operations, features, means, or instructions for receiving
or transmitting the data transmission based on receiving the
cross-slot grant.
[0021] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the
scheduling offset threshold indicates a number of slots defined in
the first numerology.
[0022] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the
scheduling offset threshold indicates a number of slots defined in
the second numerology.
[0023] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the
scheduling offset threshold corresponds to a minimum scheduling
offset or a minimum applicable value.
[0024] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein,
determining the beginning slot of the shared channel may include
operations, features, means, or instructions for determining the
beginning slot relative to the control channel based on the
scheduling offset threshold.
[0025] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the
control channel of the first slot occurs after a beginning symbol
period of the first slot, and where the scheduling offset threshold
indicates a number of symbol periods defined in the second
numerology relative to a beginning of the control channel.
[0026] Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for receiving, via a
second control channel of the first slot, a second cross-slot
grant.
[0027] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein,
determining the beginning slot of the shared channel may include
operations, features, means, or instructions for determining the
beginning slot relative to the control channel based on the
scheduling offset threshold and a second scheduling offset
indicated in the cross-slot grant, and determining a second
beginning slot relative to the second control channel based on the
scheduling offset threshold and a third scheduling offset indicated
in the second cross-slot grant.
[0028] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the
scheduling offset threshold indicates a number of symbol periods
defined in the second numerology.
[0029] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the
scheduling offset threshold indicates a relative timing
difference.
[0030] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein,
determining the beginning slot of the shared channel may include
operations, features, means, or instructions for determining the
beginning slot relative to the control channel based on the
relative timing difference, and determining the second beginning
slot of the shared channel relative to the second control channel
based on the relative timing difference.
[0031] Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for receiving control
signaling indicating a change to the scheduling offset
threshold.
[0032] Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for applying the
change to the scheduling offset threshold in a slot occurring after
the beginning slot.
[0033] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein,
determining the beginning slot of the shared channel may include
operations, features, means, or instructions for mapping an ending
symbol period of the control channel to a shared channel slot of
the shared channel defined in the second numerology, and
determining the beginning slot based on the shared channel slot and
the relative timing difference.
[0034] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the
control channel of the first slot includes a beginning symbol
period of the first slot, and where the scheduling offset threshold
indicates a number of symbol periods defined in the second
numerology relative to the control channel.
[0035] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, entering
the low power state or communicating the data transmission may
include operations, features, means, or instructions for
controlling at least one radio frequency chain to enter the low
power state based on whether the cross-slot grant may be
detected.
[0036] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein,
determining the beginning slot of the shared channel may include
operations, features, means, or instructions for determining the
beginning slot based on the scheduling offset threshold and a
second scheduling offset indicated in the cross-slot grant.
[0037] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein,
monitoring the control channel in the first slot for the cross-slot
grant further may include operations, features, means, or
instructions for determining that the cross-slot grant may be
invalid based on the second scheduling offset having a shorter
duration than the scheduling offset threshold, and entering the low
power state based on determining that the cross-slot grant may be
invalid.
[0038] A method of wireless communications by a base station is
described. The method may include transmitting control signaling
that indicates a scheduling offset threshold corresponding to a
cross-slot grant, transmitting, in a first slot, the cross-slot
grant in a control channel that has a first numerology that is
different than a second numerology of a shared channel, determining
a beginning slot in the second numerology based on the scheduling
offset threshold, and transmitting or receiving a data transmission
during the beginning slot based on the cross-slot grant.
[0039] An apparatus for wireless communications by a base station
is described. The apparatus may include a processor, memory coupled
with the processor, and instructions stored in the memory. The
instructions may be executable by the processor to cause the
apparatus to transmit control signaling that indicates a scheduling
offset threshold corresponding to a cross-slot grant, transmit, in
a first slot, the cross-slot grant in a control channel that has a
first numerology that is different than a second numerology of a
shared channel, determine a beginning slot in the second numerology
based on the scheduling offset threshold, and transmit or receiving
a data transmission during the beginning slot based on the
cross-slot grant.
[0040] Another apparatus for wireless communications by a base
station is described. The apparatus may include means for
transmitting control signaling that indicates a scheduling offset
threshold corresponding to a cross-slot grant, transmitting, in a
first slot, the cross-slot grant in a control channel that has a
first numerology that is different than a second numerology of a
shared channel, determining a beginning slot in the second
numerology based on the scheduling offset threshold, and
transmitting or receiving a data transmission during the beginning
slot based on the cross-slot grant.
[0041] A non-transitory computer-readable medium storing code for
wireless communications by a base station is described. The code
may include instructions executable by a processor to transmit
control signaling that indicates a scheduling offset threshold
corresponding to a cross-slot grant, transmit, in a first slot, the
cross-slot grant in a control channel that has a first numerology
that is different than a second numerology of a shared channel,
determine a beginning slot in the second numerology based on the
scheduling offset threshold, and transmit or receiving a data
transmission during the beginning slot based on the cross-slot
grant.
[0042] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein,
transmitting the control signaling may include operations,
features, means, or instructions for transmitting layer one control
signaling indicating the scheduling offset threshold from a set of
different candidate scheduling offset thresholds.
[0043] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein,
transmitting the cross-slot grant may include operations, features,
means, or instructions for transmitting the cross-slot grant in a
downlink bandwidth part having the first numerology, the cross-slot
grant scheduling the data transmission as an uplink transmission on
the shared channel in an active uplink bandwidth part having the
second numerology.
[0044] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein,
transmitting the cross-slot grant may include operations, features,
means, or instructions for transmitting the cross-slot grant in a
downlink bandwidth part having the first numerology, the cross-slot
grant scheduling the data transmission as a downlink transmission
on the shared channel in a target uplink bandwidth part having the
second numerology.
[0045] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein,
determining the beginning slot may include operations, features,
means, or instructions for converting the scheduling offset
threshold to a second scheduling offset threshold in the second
numerology, the scheduling offset threshold being defined in the
first numerology, and determining the beginning slot based on the
second scheduling offset threshold.
[0046] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein,
transmitting the cross-slot grant may include operations, features,
means, or instructions for transmitting the cross-slot grant via a
first component carrier that may be defined in the first
numerology, the cross-slot grant scheduling the data transmission
on the shared channel via a second component carrier that may be
defined in the second numerology.
[0047] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the
scheduling offset threshold indicates a number of slots defined in
the first numerology.
[0048] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the
scheduling offset threshold indicates a number of slots defined in
the second numerology.
[0049] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the
scheduling offset threshold may be a minimum scheduling offset
threshold.
[0050] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein,
determining the beginning slot of the shared channel may include
operations, features, means, or instructions for determining the
beginning slot relative to the control channel based on the
scheduling offset threshold.
[0051] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the
control channel of the first slot occurs after a beginning symbol
period of the first slot, and where the scheduling offset threshold
indicates a number of symbol periods in the second numerology
relative to a beginning of the control channel.
[0052] Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for transmitting, via
a second control channel of the first slot, a second cross-slot
grant.
[0053] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein,
determining the beginning slot of the shared channel may include
operations, features, means, or instructions for determining the
beginning slot relative to the control channel based on the
scheduling offset threshold and a second scheduling offset
indicated in the cross-slot grant, and determining a second
beginning slot relative to the second control channel based on the
scheduling offset threshold and a third scheduling offset indicated
in the second cross-slot grant.
[0054] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the
scheduling offset threshold indicates a number of symbol periods
defined in the second numerology.
[0055] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the
scheduling offset threshold may be a relative timing
difference.
[0056] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein,
determining the beginning slot of the shared channel may include
operations, features, means, or instructions for determining the
beginning slot relative to the control channel based on the
relative timing difference, and determining the second beginning
slot of the shared channel relative to the second control channel
based on the relative timing difference.
[0057] Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for transmitting
control signaling indicating a change to the scheduling offset
threshold.
[0058] Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for applying the
change to the scheduling offset threshold in a slot occurring after
the beginning slot.
[0059] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein,
determining the beginning slot of the shared channel may include
operations, features, means, or instructions for mapping an ending
symbol period of the control channel to a shared channel slot of
the shared channel defined in the second numerology, and
determining the beginning slot based on the shared channel slot and
the relative timing difference.
[0060] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the
control channel of the first slot includes a beginning symbol
period of the first slot, and where the scheduling offset threshold
indicates a number of symbol periods defined in the second
numerology relative to the control channel.
BRIEF DESCRIPTION OF THE DRAWINGS
[0061] FIG. 1 illustrates an example of a system for wireless
communications that supports cross-slot scheduling for cross
numerology in accordance with aspects of the present
disclosure.
[0062] FIG. 2 illustrates an example of a wireless communications
system that supports cross-slot scheduling for cross numerology in
accordance with aspects of the present disclosure.
[0063] FIGS. 3 through 5 illustrate example of cross-slot
scheduling configurations that support cross-slot scheduling for
cross numerology in accordance with aspects of the present
disclosure.
[0064] FIG. 6 illustrates an example of a process flow that
supports cross-slot scheduling for cross numerology in accordance
with aspects of the present disclosure.
[0065] FIGS. 7 and 8 show block diagrams of devices that support
cross-slot scheduling for cross numerology in accordance with
aspects of the present disclosure.
[0066] FIG. 9 shows a block diagram of a communications manager
that supports cross-slot scheduling for cross numerology in
accordance with aspects of the present disclosure.
[0067] FIG. 10 shows a diagram of a system including a device that
supports cross-slot scheduling for cross numerology in accordance
with aspects of the present disclosure.
[0068] FIGS. 11 and 12 show block diagrams of devices that support
cross-slot scheduling for cross numerology in accordance with
aspects of the present disclosure.
[0069] FIG. 13 shows a block diagram of a communications manager
that supports cross-slot scheduling for cross numerology in
accordance with aspects of the present disclosure.
[0070] FIG. 14 shows a diagram of a system including a device that
supports cross-slot scheduling for cross numerology in accordance
with aspects of the present disclosure.
[0071] FIGS. 15 through 20 show flowcharts illustrating methods
that support cross-slot scheduling for cross numerology in
accordance with aspects of the present disclosure.
DETAILED DESCRIPTION
[0072] A user equipment (UE) may communicate with a base station on
one or more component carriers according to a carrier aggregation
configuration. Some carriers may be configured for uplink
transmissions, downlink transmissions, or both uplink and downlink.
In some cases, two carriers configured for the UE may have
different subcarrier spacings (SCSs). In some examples, slot
duration may be based on SCS, so a slot on a first carrier may have
a different length than a slot on a second carrier if the first and
second carriers have different numerologies. In some cases, the
base station may transmit downlink control information (DCI) on a
downlink carrier, the DCI carrying a grant which may schedule the
UE for an uplink or downlink shared channel transmission. In some
cases, the base station may indicate a scheduling gap between a
grant on a downlink control channel and the shared channel which is
scheduled by the grant. In some examples, the scheduling gap may be
0, indicating that the shared channel is scheduled for the same
slot as the grant. In some other examples, the scheduling gap may
be greater than 0 slots, indicating that the scheduled shared
channel is in a subsequent slot (e.g., a value of 0 may indicate
same slot, a value of 1 may indicate the next slot, a value of 2
may indicate the slot after next, etc.).
[0073] The UE may be capable of operating in a lower power mode
when not scheduled for a transmission. For example, if the UE knows
ahead of time the range of symbols which are not scheduled for a
transmission, the UE may put some of its antenna, radio frequency
(RF) hardware, or front-end hardware into a power saving mode for
that range of symbols. It may take some time for the UE to process
a downlink control channel to determine whether or not the downlink
control channel has an assignment for the UE. With cross-slot
scheduling (e.g., a scheduling gap larger than 0 slots), the UE may
determine if a current slot is scheduled based on downlink control
information received in a previous slot, which may enable the UE to
extend the duration of being in the low power state. However, some
advantages of cross-slot scheduling may not be realized as long as
the UE supports same-slot scheduling. In some cases, it may not be
sufficient for the network to cross-slot scheduling as well as
same-slot scheduling, as the UE may first have to finish blind
decoding all of the downlink control channel candidates to know
whether or not there are any same-slot assignments.
[0074] Therefore, the UE and base station may implement for
cross-slot scheduling by using a minimum scheduling offset. For
example, a minimum downlink scheduling offset may explicitly
control the minimum gap between a downlink control channel and a
downlink shared channel that the UE is expected to handle for
downlink shared channel scheduling. These techniques are described
with reference to cross-slot scheduling slots that may have
different numerologies. In some cases, cross-slot scheduling with
different numerologies may introduce some ambiguity in how the UE
could interpret the minimum scheduling offset. For example, the UE
may not know whether to interpret the minimum scheduling offset
based on the numerology of the scheduling channel or based on the
numerology of the scheduled channel if the two numerologies are
different. Using the techniques described herein, the UE may
interpret the minimum scheduling offset and determine a first slot,
or a beginning slot, on a shared channel which could be scheduled
by a grant transmitted on a downlink control channel. The UE may
then determine to either operate in a low power state starting at
that slot or to communicate data on the shared channel based on
whether the UE received a grant scheduling the UE for a
transmission. Various different scenarios are described herein,
including cross-bandwidth part (BWP) scheduling, cross-component
carrier scheduling, and BWP reselection, among others. Further,
multiple different possible interpretations of the minimum
scheduling offset are described herein, including interpretations
based on the numerology of the scheduling control channel, the
scheduled shared channel, or a combination thereof.
[0075] Aspects of the disclosure are initially described in the
context of a wireless communications system. Aspects of the
disclosure are further illustrated by and described with reference
to apparatus diagrams, system diagrams, and flowcharts that relate
to cross-slot scheduling for cross numerology.
[0076] FIG. 1 illustrates an example of a wireless communications
system 100 that supports cross-slot scheduling for cross numerology
in accordance with aspects of the present disclosure. The wireless
communications system 100 includes base stations 105, UEs 115, and
a core network 130. In some examples, the wireless communications
system 100 may be a Long Term Evolution (LTE) network, an
LTE-Advanced (LTE-A) network, an LTE-A Pro network, or a New Radio
(NR) network. In some cases, wireless communications system 100 may
support enhanced broadband communications, ultra-reliable (e.g.,
mission critical) communications, low latency communications, or
communications with low-cost and low-complexity devices.
[0077] Base stations 105 may wirelessly communicate with UEs 115
via one or more base station antennas. Base stations 105 described
herein may include or may be referred to by those skilled in the
art as a base transceiver station, a radio base station, an access
point, a radio transceiver, a NodeB, an eNodeB (eNB), a
next-generation NodeB or giga-NodeB (either of which may be
referred to as a gNB), a Home NodeB, a Home eNodeB, or some other
suitable terminology. Wireless communications system 100 may
include base stations 105 of different types (e.g., macro or small
cell base stations). The UEs 115 described herein may be able to
communicate with various types of base stations 105 and network
equipment including macro eNBs, small cell eNBs, gNBs, relay base
stations, and the like.
[0078] Each base station 105 may be associated with a particular
geographic coverage area 110 in which communications with various
UEs 115 is supported. Each base station 105 may provide
communication coverage for a respective geographic coverage area
110 via communication links 125, and communication links 125
between a base station 105 and a UE 115 may utilize one or more
carriers. Communication links 125 shown in wireless communications
system 100 may include uplink transmissions from a UE 115 to a base
station 105, or downlink transmissions from a base station 105 to a
UE 115. Downlink transmissions may also be called forward link
transmissions while uplink transmissions may also be called reverse
link transmissions.
[0079] The geographic coverage area 110 for a base station 105 may
be divided into sectors making up a portion of the geographic
coverage area 110, and each sector may be associated with a cell.
For example, each base station 105 may provide communication
coverage for a macro cell, a small cell, a hot spot, or other types
of cells, or various combinations thereof. In some examples, a base
station 105 may be movable and therefore provide communication
coverage for a moving geographic coverage area 110. In some
examples, different geographic coverage areas 110 associated with
different technologies may overlap, and overlapping geographic
coverage areas 110 associated with different technologies may be
supported by the same base station 105 or by different base
stations 105. The wireless communications system 100 may include,
for example, a heterogeneous LTE/LTE-A/LTE-A Pro or NR network in
which different types of base stations 105 provide coverage for
various geographic coverage areas 110.
[0080] The term "cell" refers to a logical communication entity
used for communication with a base station 105 (e.g., over a
carrier), and may be associated with an identifier for
distinguishing neighboring cells (e.g., a physical cell identifier
(PCID), a virtual cell identifier (VCID)) operating via the same or
a different carrier. In some examples, a carrier may support
multiple cells, and different cells may be configured according to
different protocol types (e.g., machine-type communication (MTC),
narrowband Internet-of-Things (NB-IoT), enhanced mobile broadband
(eMBB), or others) that may provide access for different types of
devices. In some cases, the term "cell" may refer to a portion of a
geographic coverage area 110 (e.g., a sector) over which the
logical entity operates.
[0081] UEs 115 may be dispersed throughout the wireless
communications system 100, and each UE 115 may be stationary or
mobile. A UE 115 may also be referred to as a mobile device, a
wireless device, a remote device, a handheld device, or a
subscriber device, or some other suitable terminology, where the
"device" may also be referred to as a unit, a station, a terminal,
or a client. A UE 115 may also be a personal electronic device such
as a cellular phone, a personal digital assistant (PDA), a tablet
computer, a laptop computer, or a personal computer. In some
examples, a UE 115 may also refer to a wireless local loop (WLL)
station, an Internet of Things (IoT) device, an Internet of
Everything (IoE) device, or an MTC device, or the like, which may
be implemented in various articles such as appliances, vehicles,
meters, or the like.
[0082] Some UEs 115, such as MTC or IoT devices, may be low cost or
low complexity devices, and may provide for automated communication
between machines (e.g., via Machine-to-Machine (M2M)
communication). M2M communication or MTC may refer to data
communication technologies that allow devices to communicate with
one another or a base station 105 without human intervention. In
some examples, M2M communication or MTC may include communications
from devices that integrate sensors or meters to measure or capture
information and relay that information to a central server or
application program that can make use of the information or present
the information to humans interacting with the program or
application. Some UEs 115 may be designed to collect information or
enable automated behavior of machines. Examples of applications for
MTC devices include smart metering, inventory monitoring, water
level monitoring, equipment monitoring, healthcare monitoring,
wildlife monitoring, weather and geological event monitoring, fleet
management and tracking, remote security sensing, physical access
control, and transaction-based business charging.
[0083] Some UEs 115 may be configured to employ operating modes
that reduce power consumption, such as half-duplex communications
(e.g., a mode that supports one-way communication via transmission
or reception, but not transmission and reception simultaneously).
In some examples half-duplex communications may be performed at a
reduced peak rate. Other power conservation techniques for UEs 115
include entering a power saving "deep sleep" mode when not engaging
in active communications, or operating over a limited bandwidth
(e.g., according to narrowband communications). In some cases, UEs
115 may be designed to support critical functions (e.g., mission
critical functions), and a wireless communications system 100 may
be configured to provide ultra-reliable communications for these
functions.
[0084] In some cases, a UE 115 may also be able to communicate
directly with other UEs 115 (e.g., using a peer-to-peer (P2P) or
device-to-device (D2D) protocol). One or more of a group of UEs 115
utilizing D2D communications may be within the geographic coverage
area 110 of a base station 105. Other UEs 115 in such a group may
be outside the geographic coverage area 110 of a base station 105
or be otherwise unable to receive transmissions from a base station
105. In some cases, groups of UEs 115 communicating via D2D
communications may utilize a one-to-many (1:M) system in which each
UE 115 transmits to every other UE 115 in the group. In some cases,
a base station 105 facilitates the scheduling of resources for D2D
communications. In other cases, D2D communications are carried out
between UEs 115 without the involvement of a base station 105.
[0085] Base stations 105 may communicate with the core network 130
and with one another. For example, base stations 105 may interface
with the core network 130 through backhaul links 132 (e.g., via an
S1, N2, N3, or another interface). Base stations 105 may
communicate with one another over backhaul links 134 (e.g., via an
X2, Xn, or other interface) either directly (e.g., directly between
base stations 105) or indirectly (e.g., via core network 130).
[0086] The core network 130 may provide user authentication, access
authorization, tracking, Internet Protocol (IP) connectivity, and
other access, routing, or mobility functions. The core network 130
may be an evolved packet core (EPC), which may include at least one
mobility management entity (MME), at least one serving gateway
(S-GW), and at least one Packet Data Network (PDN) gateway (P-GW).
The MME may manage non-access stratum (e.g., control plane)
functions such as mobility, authentication, and bearer management
for UEs 115 served by base stations 105 associated with the EPC.
User IP packets may be transferred through the S-GW, which itself
may be connected to the P-GW. The P-GW may provide IP address
allocation as well as other functions. The P-GW may be connected to
the network operators IP services. The operators IP services may
include access to the Internet, Intranet(s), an IP Multimedia
Subsystem (IMS), or a Packet-Switched (PS) Streaming Service.
[0087] At least some of the network devices, such as a base station
105, may include subcomponents such as an access network entity,
which may be an example of an access node controller (ANC). Each
access network entity may communicate with UEs 115 through a number
of other access network transmission entities, which may be
referred to as a radio head, a smart radio head, or a
transmission/reception point (TRP). In some configurations, various
functions of each access network entity or base station 105 may be
distributed across various network devices (e.g., radio heads and
access network controllers) or consolidated into a single network
device (e.g., a base station 105).
[0088] Wireless communications system 100 may operate using one or
more frequency bands, typically in the range of 300 megahertz (MHz)
to 300 gigahertz (GHz). Generally, the region from 300 MHz to 3 GHz
is known as the ultra-high frequency (UHF) region or decimeter
band, since the wavelengths range from approximately one decimeter
to one meter in length. UHF waves may be blocked or redirected by
buildings and environmental features. However, the waves may
penetrate structures sufficiently for a macro cell to provide
service to UEs 115 located indoors. Transmission of UHF waves may
be associated with smaller antennas and shorter range (e.g., less
than 100 km) compared to transmission using the smaller frequencies
and longer waves of the high frequency (HF) or very high frequency
(VHF) portion of the spectrum below 300 MHz.
[0089] Wireless communications system 100 may also operate in a
super high frequency (SHF) region using frequency bands from 3 GHz
to 30 GHz, also known as the centimeter band. The SHF region
includes bands such as the 5 GHz industrial, scientific, and
medical (ISM) bands, which may be used opportunistically by devices
that may be capable of tolerating interference from other
users.
[0090] Wireless communications system 100 may also operate in an
extremely high frequency (EHF) region of the spectrum (e.g., from
30 GHz to 300 GHz), also known as the millimeter band. In some
examples, wireless communications system 100 may support millimeter
wave (mmW) communications between UEs 115 and base stations 105,
and EHF antennas of the respective devices may be even smaller and
more closely spaced than UHF antennas. In some cases, this may
facilitate use of antenna arrays within a UE 115. However, the
propagation of EHF transmissions may be subject to even greater
atmospheric attenuation and shorter range than SHF or UHF
transmissions. Techniques disclosed herein may be employed across
transmissions that use one or more different frequency regions, and
designated use of bands across these frequency regions may differ
by country or regulating body.
[0091] In some cases, wireless communications system 100 may
utilize both licensed and unlicensed radio frequency spectrum
bands. For example, wireless communications system 100 may employ
License Assisted Access (LAA), LTE-Unlicensed (LTE-U) radio access
technology, or NR technology in an unlicensed band such as the 5
GHz ISM band. When operating in unlicensed radio frequency spectrum
bands, wireless devices such as base stations 105 and UEs 115 may
employ listen-before-talk (LBT) procedures to ensure a frequency
channel is clear before transmitting data. In some cases,
operations in unlicensed bands may be based on a carrier
aggregation configuration in conjunction with component carriers
operating in a licensed band (e.g., LAA). Operations in unlicensed
spectrum may include downlink transmissions, uplink transmissions,
peer-to-peer transmissions, or a combination of these. Duplexing in
unlicensed spectrum may be based on frequency division duplexing
(FDD), time division duplexing (TDD), or a combination of both.
[0092] In some examples, base station 105 or UE 115 may be equipped
with multiple antennas, which may be used to employ techniques such
as transmit diversity, receive diversity, multiple-input
multiple-output (MIMO) communications, or beamforming. For example,
wireless communications system 100 may use a transmission scheme
between a transmitting device (e.g., a base station 105) and a
receiving device (e.g., a UE 115), where the transmitting device is
equipped with multiple antennas and the receiving device is
equipped with one or more antennas. MIMO communications may employ
multipath signal propagation to increase the spectral efficiency by
transmitting or receiving multiple signals via different spatial
layers, which may be referred to as spatial multiplexing. The
multiple signals may, for example, be transmitted by the
transmitting device via different antennas or different
combinations of antennas. Likewise, the multiple signals may be
received by the receiving device via different antennas or
different combinations of antennas. Each of the multiple signals
may be referred to as a separate spatial stream and may carry bits
associated with the same data stream (e.g., the same codeword) or
different data streams. Different spatial layers may be associated
with different antenna ports used for channel measurement and
reporting. MIMO techniques include single-user MIMO (SU-MIMO) where
multiple spatial layers are transmitted to the same receiving
device, and multiple-user MIMO (MU-MIMO) where multiple spatial
layers are transmitted to multiple devices.
[0093] Beamforming, which may also be referred to as spatial
filtering, directional transmission, or directional reception, is a
signal processing technique that may be used at a transmitting
device or a receiving device (e.g., a base station 105 or a UE 115)
to shape or steer an antenna beam (e.g., a transmit beam or receive
beam) along a spatial path between the transmitting device and the
receiving device. Beamforming may be achieved by combining the
signals communicated via antenna elements of an antenna array such
that signals propagating at particular orientations with respect to
an antenna array experience constructive interference while others
experience destructive interference. The adjustment of signals
communicated via the antenna elements may include a transmitting
device or a receiving device applying certain amplitude and phase
offsets to signals carried via each of the antenna elements
associated with the device. The adjustments associated with each of
the antenna elements may be defined by a beamforming weight set
associated with a particular orientation (e.g., with respect to the
antenna array of the transmitting device or receiving device, or
with respect to some other orientation).
[0094] In one example, a base station 105 may use multiple antennas
or antenna arrays to conduct beamforming operations for directional
communications with a UE 115. For instance, some signals (e.g.
synchronization signals, reference signals, beam selection signals,
or other control signals) may be transmitted by a base station 105
multiple times in different directions, which may include a signal
being transmitted according to different beamforming weight sets
associated with different directions of transmission. Transmissions
in different beam directions may be used to identify (e.g., by the
base station 105 or a receiving device, such as a UE 115) a beam
direction for subsequent transmission and/or reception by the base
station 105.
[0095] Some signals, such as data signals associated with a
particular receiving device, may be transmitted by a base station
105 in a single beam direction (e.g., a direction associated with
the receiving device, such as a UE 115). In some examples, the beam
direction associated with transmissions along a single beam
direction may be determined based at least in in part on a signal
that was transmitted in different beam directions. For example, a
UE 115 may receive one or more of the signals transmitted by the
base station 105 in different directions, and the UE 115 may report
to the base station 105 an indication of the signal it received
with a highest signal quality, or an otherwise acceptable signal
quality. Although these techniques are described with reference to
signals transmitted in one or more directions by a base station
105, a UE 115 may employ similar techniques for transmitting
signals multiple times in different directions (e.g., for
identifying a beam direction for subsequent transmission or
reception by the UE 115) or transmitting a signal in a single
direction (e.g., for transmitting data to a receiving device).
[0096] A receiving device (e.g., a UE 115, which may be an example
of a mmW receiving device) may try multiple receive beams when
receiving various signals from the base station 105, such as
synchronization signals, reference signals, beam selection signals,
or other control signals. For example, a receiving device may try
multiple receive directions by receiving via different antenna
subarrays, by processing received signals according to different
antenna subarrays, by receiving according to different receive
beamforming weight sets applied to signals received at a plurality
of antenna elements of an antenna array, or by processing received
signals according to different receive beamforming weight sets
applied to signals received at a plurality of antenna elements of
an antenna array, any of which may be referred to as "listening"
according to different receive beams or receive directions. In some
examples a receiving device may use a single receive beam to
receive along a single beam direction (e.g., when receiving a data
signal). The single receive beam may be aligned in a beam direction
determined based at least in part on listening according to
different receive beam directions (e.g., a beam direction
determined to have a highest signal strength, highest
signal-to-noise ratio, or otherwise acceptable signal quality based
at least in part on listening according to multiple beam
directions).
[0097] In some cases, the antennas of a base station 105 or UE 115
may be located within one or more antenna arrays, which may support
MIMO operations, or transmit or receive beamforming. For example,
one or more base station antennas or antenna arrays may be
co-located at an antenna assembly, such as an antenna tower. In
some cases, antennas or antenna arrays associated with a base
station 105 may be located in diverse geographic locations. A base
station 105 may have an antenna array with a number of rows and
columns of antenna ports that the base station 105 may use to
support beamforming of communications with a UE 115. Likewise, a UE
115 may have one or more antenna arrays that may support various
MIMO or beamforming operations.
[0098] In some cases, wireless communications system 100 may be a
packet-based network that operate according to a layered protocol
stack. In the user plane, communications at the bearer or Packet
Data Convergence Protocol (PDCP) layer may be IP-based. A Radio
Link Control (RLC) layer may perform packet segmentation and
reassembly to communicate over logical channels. A Medium Access
Control (MAC) layer may perform priority handling and multiplexing
of logical channels into transport channels. The MAC layer may also
use hybrid automatic repeat request (HARQ) to provide
retransmission at the MAC layer to improve link efficiency. In the
control plane, the Radio Resource Control (RRC) protocol layer may
provide establishment, configuration, and maintenance of an RRC
connection between a UE 115 and a base station 105 or core network
130 supporting radio bearers for user plane data. At the Physical
layer, transport channels may be mapped to physical channels.
[0099] In some cases, UEs 115 and base stations 105 may support
retransmissions of data to increase the likelihood that data is
received successfully. HARQ feedback is one technique of increasing
the likelihood that data is received correctly over a communication
link 125. HARQ may include a combination of error detection (e.g.,
using a cyclic redundancy check (CRC)), forward error correction
(FEC), and retransmission (e.g., automatic repeat request (ARQ)).
HARQ may improve throughput at the MAC layer in poor radio
conditions (e.g., signal-to-noise conditions). In some cases, a
wireless device may support same-slot HARQ feedback, where the
device may provide HARQ feedback in a specific slot for data
received in a previous symbol in the slot. In other cases, the
device may provide HARQ feedback in a subsequent slot, or according
to some other time interval.
[0100] Time intervals in LTE or NR may be expressed in multiples of
a basic time unit, which may, for example, refer to a sampling
period of T.sub.s=1/30,720,000 seconds. Time intervals of a
communications resource may be organized according to radio frames
each having a duration of 10 milliseconds (ms), where the frame
period may be expressed as T.sub.f=307,200 Ts. The radio frames may
be identified by a system frame number (SFN) ranging from 0 to
1023. Each frame may include 10 subframes numbered from 0 to 9, and
each subframe may have a duration of 1 ms. A subframe may be
further divided into 2 slots each having a duration of 0.5 ms, and
each slot may contain 6 or 7 modulation symbol periods (e.g.,
depending on the length of the cyclic prefix prepended to each
symbol period). Excluding the cyclic prefix, each symbol period may
contain 2048 sampling periods. In some cases, a subframe may be the
smallest scheduling unit of the wireless communications system 100
and may be referred to as a transmission time interval (TTI). In
other cases, a smallest scheduling unit of the wireless
communications system 100 may be shorter than a subframe or may be
dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) or
in selected component carriers using sTTIs).
[0101] In some wireless communications systems, a slot may further
be divided into multiple mini-slots containing one or more symbols.
In some instances, a symbol of a mini-slot or a mini-slot may be
the smallest unit of scheduling. Each symbol may vary in duration
depending on the subcarrier spacing or frequency band of operation,
for example. Further, some wireless communications systems may
implement slot aggregation in which multiple slots or mini-slots
are aggregated together and used for communication between a UE 115
and a base station 105.
[0102] The term "carrier" refers to a set of radio frequency
spectrum resources having a defined physical layer structure for
supporting communications over a communication link 125. For
example, a carrier of a communication link 125 may include a
portion of a radio frequency spectrum band that is operated
according to physical layer channels for a given radio access
technology. Each physical layer channel may carry user data,
control information, or other signaling. A carrier may be
associated with a pre-defined frequency channel (e.g., an evolved
universal mobile telecommunication system terrestrial radio access
(E-UTRA) absolute radio frequency channel number (EARFCN)) and may
be positioned according to a channel raster for discovery by UEs
115. Carriers may be downlink or uplink (e.g., in an FDD mode), or
be configured to carry downlink and uplink communications (e.g., in
a TDD mode). In some examples, signal waveforms transmitted over a
carrier may be made up of multiple sub-carriers (e.g., using
multi-carrier modulation (MCM) techniques such as orthogonal
frequency division multiplexing (OFDM) or discrete Fourier
transform spread OFDM (DFT-S-OFDM)).
[0103] The organizational structure of the carriers may be
different for different radio access technologies (e.g., LTE,
LTE-A, LTE-A Pro, NR). For example, communications over a carrier
may be organized according to TTIs or slots, each of which may
include user data as well as control information or signaling to
support decoding the user data. A carrier may also include
dedicated acquisition signaling (e.g., synchronization signals or
system information, etc.) and control signaling that coordinates
operation for the carrier. In some examples (e.g., in a carrier
aggregation configuration), a carrier may also have acquisition
signaling or control signaling that coordinates operations for
other carriers.
[0104] Physical channels may be multiplexed on a carrier according
to various techniques. A physical control channel and a physical
data channel may be multiplexed on a downlink carrier, for example,
using time division multiplexing (TDM) techniques, frequency
division multiplexing (FDM) techniques, or hybrid TDM-FDM
techniques. In some examples, control information transmitted in a
physical control channel may be distributed between different
control regions in a cascaded manner (e.g., between a common
control region or common search space and one or more UE-specific
control regions or UE-specific search spaces).
[0105] A carrier may be associated with a particular bandwidth of
the radio frequency spectrum, and in some examples the carrier
bandwidth may be referred to as a "system bandwidth" of the carrier
or the wireless communications system 100. For example, the carrier
bandwidth may be one of a number of predetermined bandwidths for
carriers of a particular radio access technology (e.g., 1.4, 3, 5,
10, 15, 20, 40, or 80 MHz). In some examples, each served UE 115
may be configured for operating over portions or all of the carrier
bandwidth. In other examples, some UEs 115 may be configured for
operation using a narrowband protocol type that is associated with
a predefined portion or range (e.g., set of subcarriers or RBs)
within a carrier (e.g., "in-band" deployment of a narrowband
protocol type).
[0106] In a system employing MCM techniques, a resource element may
consist of one symbol period (e.g., a duration of one modulation
symbol) and one subcarrier, where the symbol period and subcarrier
spacing are inversely related. The number of bits carried by each
resource element may depend on the modulation scheme (e.g., the
order of the modulation scheme). Thus, the more resource elements
that a UE 115 receives and the higher the order of the modulation
scheme, the higher the data rate may be for the UE 115. In MIMO
systems, a wireless communications resource may refer to a
combination of a radio frequency spectrum resource, a time
resource, and a spatial resource (e.g., spatial layers), and the
use of multiple spatial layers may further increase the data rate
for communications with a UE 115.
[0107] Devices of the wireless communications system 100 (e.g.,
base stations 105 or UEs 115) may have a hardware configuration
that supports communications over a particular carrier bandwidth or
may be configurable to support communications over one of a set of
carrier bandwidths. In some examples, the wireless communications
system 100 may include base stations 105 and/or UEs 115 that
support simultaneous communications via carriers associated with
more than one different carrier bandwidth.
[0108] Wireless communications system 100 may support communication
with a UE 115 on multiple cells or carriers, a feature which may be
referred to as carrier aggregation or multi-carrier operation. A UE
115 may be configured with multiple downlink component carriers and
one or more uplink component carriers according to a carrier
aggregation configuration. Carrier aggregation may be used with
both FDD and TDD component carriers.
[0109] In some cases, wireless communications system 100 may
utilize enhanced component carriers (eCCs). An eCC may be
characterized by one or more features including wider carrier or
frequency channel bandwidth, shorter symbol duration, shorter TTI
duration, or modified control channel configuration. In some cases,
an eCC may be associated with a carrier aggregation configuration
or a dual connectivity configuration (e.g., when multiple serving
cells have a suboptimal or non-ideal backhaul link). An eCC may
also be configured for use in unlicensed spectrum or shared
spectrum (e.g., where more than one operator is allowed to use the
spectrum). An eCC characterized by wide carrier bandwidth may
include one or more segments that may be utilized by UEs 115 that
are not capable of monitoring the whole carrier bandwidth or are
otherwise configured to use a limited carrier bandwidth (e.g., to
conserve power).
[0110] In some cases, an eCC may utilize a different symbol
duration than other component carriers, which may include use of a
reduced symbol duration as compared with symbol durations of the
other component carriers. A shorter symbol duration may be
associated with increased spacing between adjacent subcarriers. A
device, such as a UE 115 or base station 105, utilizing eCCs may
transmit wideband signals (e.g., according to frequency channel or
carrier bandwidths of 20, 40, 60, 80 MHz, etc.) at reduced symbol
durations (e.g., 16.67 microseconds). A TTI in eCC may consist of
one or multiple symbol periods. In some cases, the TTI duration
(that is, the number of symbol periods in a TTI) may be
variable.
[0111] Wireless communications system 100 may be an NR system that
may utilize any combination of licensed, shared, and unlicensed
spectrum bands, among others. The flexibility of eCC symbol
duration and subcarrier spacing may allow for the use of eCC across
multiple spectrums. In some examples, NR shared spectrum may
increase spectrum utilization and spectral efficiency, specifically
through dynamic vertical (e.g., across the frequency domain) and
horizontal (e.g., across the time domain) sharing of resources.
[0112] To support an extended duration of UEs 115 being in a power
saving mode or microsleep, UEs 115 and base stations 105 described
herein may implement techniques to enhance cross-slot scheduling by
using a minimum scheduling offset. For example, a minimum downlink
scheduling offset may control the minimum gap between a downlink
control channel and a downlink shared channel that a UE 115 is
expected to handle for downlink shared channel scheduling. These
techniques may be described with reference to cross-slot scheduling
slots that may have different numerologies. These techniques may
remove ambiguity in how the UE 115 could interpret the minimum
scheduling offset when the scheduling downlink control channel has
a different numerology than the shared channel. Using the
techniques described herein, the UE 115 may interpret the minimum
scheduling offset and determine a first slot, or a beginning slot,
on a shared channel which could be scheduled by a grant transmitted
on a downlink control channel. The UE 115 may then determine to
either operate in a low power state starting at that slot or to
communicate data on the shared channel during that slot based on
whether the UE115 received a grant scheduling the UE 115 for a
transmission.
[0113] FIG. 2 illustrates an example of a wireless communications
system 200 that supports cross-slot scheduling for cross numerology
in accordance with aspects of the present disclosure. In some
examples, wireless communications system 200 may implement aspects
of wireless communication system 100. The wireless communications
system 200 may include UE 115-a and base station 105-a, which may
be respective examples of a UE 115 and a base station 105 described
herein.
[0114] UE 115-a may communicate with base station 105-a on one or
more component carriers according to a carrier aggregation
configuration. For example, UE 115-a may receive downlink
transmissions on a first carrier 205-a. UE 115-a may also have a
second carrier 205-b configured, which may be an example of an
uplink carrier (e.g., where UE 115-a transmits to base station
105-a on the second carrier 205-b) or a downlink carrier (e.g.,
where base station 105-a transmits to UE 115-a on the second
carrier 205-b). In some cases, two carriers 205 configured for UE
115-a may have different subcarrier spacings (SCSs) 225. For
example, the first carrier 205-a may have a first SCS 225-a, and
the second carrier 205-b may have a second SCS 225-b. In some
cases, a slot 210 configured based on the first SCS 225-a may have
a different duration than a slot configured based on the second SCS
225-b. For example, the first SCS 225-a may be 15 KHz, and the
second SCS 225-b may be 30 KHz. Therefore, a slot configured based
on the first SCS 225-a may be twice as long (e.g., have twice as
long of a duration) as a slot configured based on the second SCS
225-b.
[0115] Base station 105-a may transmit a grant in downlink control
information (DCI) on a downlink control channel 215 (e.g., a
control channel (CCH) such as a physical downlink control channel
(PDCCH)). The grant may schedule resources for UE 115-a, so that UE
115-a can transmit data to base station 105-a, or receive data from
base station 105-a, on the scheduled resources. UE 115-a may
transmit data to base station 105-a on an uplink shared channel,
such as a physical uplink shared channel (PUSCH), and base station
105-a may transmit data to UE 115-a on a downlink shared channel,
such as a physical downlink shared channel (PDSCH).
[0116] In some cases, scheduling techniques of the wireless
communications system 200 may support a scheduling gap between a
scheduling downlink control channel 215 and a scheduled shared
channel. A scheduling gap may be indicated as a number of slots
between the downlink control channel 215 and the scheduled
resource. For example, a scheduling gap of `0` may indicate that a
grant is scheduling resources within the same slot, where a
scheduling gap of `1` may indicate that a grant is scheduling
resources in a following slot. A scheduling gap between PDCCH and
PDSCH may be referred to as K0, and a scheduling gap between PDCCH
and PUSCH may be referred to as K2. Therefore, cross-slot
scheduling may correspond to a scheduling gap value which is
non-zero or greater than zero. Same-slot scheduling may refer to
DCI scheduling resources with a scheduling gap of zero.
[0117] In some examples, a scheduling gap may be indicated in DCI
transmitted on the control channel 215. The scheduling gap may
correspond to a slot offset between the scheduling PDCCH and the
scheduled shared channel (e.g., PDSCH or PUSCH). An index to an
entry in a time domain resource allocation (TDRA) table (e.g.,
"pdsch-TimeDomainAllocationList" or
"pusch-TimeDomainAllocationList") may be indicated by the DCI. The
entry in the TDRA table may contain the actual K0, or K2, value.
The TDRA tables may include one or more possible scheduling gap
values for each of K0 and K2. In some cases, each of the possible
K0 or K2 candidates may be the K0 or K2 values stored in the TDRA
tables. In some cases, the TDRA tables may be semi-statically
configured, such as by RRC.
[0118] UE 115-a may be capable of operating in a lower power mode
when UE 115-a is not scheduled to monitor any resources. For
example, if UE 115-a knows ahead of time (e.g., a-priori) the range
of symbols which are not carrying a transmission for UE 115-a, then
UE 115-a may put its RF and portion of front-end hardware, and in
some cases additional hardware, into a power saving mode for that
range of symbols. In some cases, a UE 115 going into a low power
mode as described for a short period of time (e.g., a few symbol
periods or a few slots) when the UE 115 is not scheduled may be
referred to as microsleep. Microsleep may include turning off the
RF and related circuitry, but some baseband processing may still be
performed on captured samples.
[0119] There may, in some cases, be some processing time associated
with UE 115-a determining whether or not a set of resources are
scheduled. For example, for slot scheduling with a scheduling gap
of 0 (e.g., K0=0), UE 115-a may process the PDCCH of a slot,
determine that there is not a grant or scheduled resources within
that slot, and then enter the low powered mode once the PDCCH is
processed for the remainder of the first slot if there is not an
assignment for UE 115-a within that slot. However, in some
same-slot scheduling techniques, there may be a period after the
last symbol of the PDCCH during which UE 115-a is not scheduled but
also not in the low power mode, as UE 115-a is still processing the
PDCCH and receiving the samples and store them in case a DL
scheduling grant is decoded for the current slot and the PDSCH
needs to be processed.
[0120] With cross-slot scheduling, UE 115-a may determine if a
current slot is scheduled based on downlink control information
received in a previous slot. For example, UE 115-a may determine
whether slot 210-b is scheduled based on DCI received in control
channel 215-a during slot 210-a. If UE 115-a is not scheduled for
one or more symbols of slot 210-b, UE 115-a may go to sleep or
operate in a low power mode during those symbols.
[0121] Cross-slot scheduling may enable UE 115-a to extend the
duration of microsleep or the duration of being in the low power
state, as the PDCCH processing may finish before UE 115-a is able
to know no other transmissions will be missed and UE 115-a can
enter the low power mode. Compared to techniques of same-slot
scheduling (e.g., K0=0), where processing the PDCCH can delay UE
115-a from entering the low power mode, UE 115-a may perform and
complete PDCCH processing in a previous slot. Thus, with cross-slot
scheduling, UE 115-a may be able to enter the low power mode right
away after the last symbol of control channel 215-b in slot 210-b
based on scheduling information (e.g., a grant) received in control
channel 215-a.
[0122] In some cases, UE 115-a may buffer and process received
samples for PDCCH symbols while in the low power mode. For example,
UE 115-a may receive DCI on control channel 215-b and operate in or
enter a low power or sleep state after the last symbol period of
control channel 215-b based on scheduling information received in
control channel 215-a. While in the low power mode, UE 115-a may
process control channel 215-b and determine that there are no
scheduled transmissions for UE 115-a in slot 210-c after control
channel 215-c. Therefore, after UE 115-a monitors control channel
215-c, UE 115-a may immediately enter low power mode for the
remainder of slot 210-c.
[0123] In some cases, some advantages of cross-slot scheduling may
be actualized if the network does not support same-slot scheduling.
For example, it may not be sufficient for the network to be able to
schedule with a scheduling gap greater than 0 by DCI indication. In
the example of downlink scheduling, if a K0 of 0 is among the
semi-statically configured K0 candidates in the downlink TDRA
table, then UE 115-a may still not be able to support extended
microsleep, as UE 115-a may first have to finish blind decoding all
of the PDCCH candidates to know whether or not there are any
same-slot (e.g., K0=0 or K2=0) assignments conveyed by DCI in one
of the PDCCH candidates. Unless UE 115-a checks each possible PDCCH
candidate, UE 115-a may not be certain that there are no scheduled
transmissions for UE 115-a in that slot.
[0124] Therefore, some wireless communications systems, such as
wireless communication system 200, may implement configurations
where a scheduling gap is configured to be greater than 0. In some
cases, the scheduling gap for UE 115-a may be guaranteed to be at
least greater than a threshold (e.g., greater than 0 slots to
ensure cross-slot scheduling). In some cases, each entry in the
TDRAs for uplink data and downlink data may be greater than 0
slots, such that each candidate scheduling gap (e.g., each
candidate K0 and K2) is greater than 0 slots. This may relax the
grant processing timeline to enable UE 115-a to extend the
microsleep duration, which may lead to power savings at UE 115-a.
Therefore, by ensuring that cross-slot scheduling is used, and that
same-slot scheduling is not configured, the wireless communications
system 200 may implement techniques for enhanced extended
microsleep. A minimum of K0>0 configuration (e.g., only
supporting cross-slot scheduling) may be beneficial for UE power
saving but may come at a slight expense of latency. In some cases,
it may be supported to switch to same-slot scheduling (e.g., a mode
where k0 can be equal to 0) during a traffic burst.
[0125] In some cases, the configuration for cross-slot schedule
using the minimum scheduling offset may be triggered or activated
by base station 105-a. For example, the TDRA tables may be
configured by base station 105-a via RRC. In some cases, base
station 105-a may transmit signaling (e.g., a media access control
(MAC) control element (CE)) to indicate that only cross-slot
scheduling is supported and that only scheduling gaps which are
greater than 0 are candidate scheduling gaps. In some cases, base
station 105-a may indicate updates for one or more TDRA tables. In
some examples, UE 115-a may be configured with multiple TDRA
tables, and the signaling may indicate which of the TDRA tables UE
115-a is to use. Or, in some cases, the signaling may indicate to
UE 115-a to ignore some entries of the TDRA tables (e.g., candidate
values where a scheduling gap is equal to 0). Similarly, base
station 105-a may transmit signaling to indicate that same-slot
scheduling is supported (e.g., in addition, or as an alternative,
to cross-slot scheduling).
[0126] In some cases, these techniques may be applied to other
signaling which is dynamically triggered by DCI. For example, when
A-CSI is triggered, the time offset from the grant to the A-CSI-RS
may similarly be configured (e.g., guaranteed) to be span one or
more slots to extend UE microsleep, similar to cross-slot
scheduling for PDSCH and PUSCH. For example, A-CSI reporting may be
supported to implement similar techniques to those described for
PDSCH and PUSCH transmissions where K0 and K2 are larger than
0.
[0127] In some examples, the wireless communications system 200 may
support a minimum scheduling offset configuration. For example, a
minimum downlink scheduling offset may explicitly control the
minimum K0 that UE 115-a is expected to handle for PDSCH
scheduling, even for cross-BWP scheduling (e.g., where a resource
on a target BWP is scheduled, and UE 115-a switches the active BWP
to the target BWP). The minimum scheduling offset may ensure that
any K0 or K2 value indicated to UE 115-a is at least the size of
the minimum scheduling offset. In some cases, the minimum downlink
scheduling offset may define a minimum timing offset for aperiodic
CSI-RS triggering. Generally, the minimum downlink scheduling
offset may also define a minimum timing offset for all other
downlink channels and signals that may be scheduled or triggered by
DCI. Similarly, a minimum uplink scheduling offset may be
explicitly configured, serving uplink scheduling usage (e.g., K2
and A-SRS).
[0128] The minimum scheduling offset may be identified or known by
UE 115-a. The UE 115-a may be signaled or configured with a
scheduling offset threshold that indicates a number of slots in the
minimum scheduling offset. For example, the minimum scheduling
offset may be preconfigured and stored in memory at UE 115-a.
Additionally, or alternatively, the minimum scheduling offset may
be indicated over layer one (L1) signaling, such as DCI, from base
station 105-a to UE 115-a. In some cases, the minimum scheduling
offset may be configured via RRC, or the minimum scheduling offset
may be configured for the network of the wireless communications
system 200. In some examples, the minimum scheduling offset may be
based on a capability of UE 115-a. UE 115-a may report its
capability to base station 105-a, and base station 105-a may
indicate the minimum scheduling offset based on the UE
capability.
[0129] Cross-slot scheduling with slots that have the same
numerology may not result in any ambiguity in slot definition for
the minimum scheduling offset. For example, first slot 210-a may be
configured based on a first numerology (e.g., corresponding to
first SCS 225-a), and second slot 210-b may also be configured
based on that first numerology and first SCS 225-a. If base station
105-a indicates in DCI that the minimum scheduling offset is one
slot, then UE 115-a can determine that the earliest possible
scheduled slot (e.g. a beginning slot) is the following slot after
the scheduling grant. In some cases, base station 105-a may
actually schedule resources in later slots (e.g., where the
scheduling offset is indicated to be 2 slots, 3 slots, etc.), but
UE 115-a can determine that the minimum scheduling offset is at
least one slot. In this example, the definition of a slot may be
the same for PDCCH and PDSCH on the first carrier 205-a. Similarly,
if the PDCCH schedules PUSCH resources which have the same slot
definition, there may be no ambiguity in how UE 115-a would
interpret the minimum scheduling offset. Even for cross-carrier
scheduling with the same numerology (e.g., DCI on carrier 205-a
scheduling a transmission on another carrier 205 with the same
numerology), the slot definition may be the same for both the
scheduling component carrier and the scheduled component carrier.
Therefore, if the minimum scheduling offset is indicated to be one
slot, this corresponds to the same duration on the scheduling
carrier as well as the scheduled carrier.
[0130] However, cross-slot scheduling across slots with different
numerologies may introduce some ambiguity in how UE 115-a could
interpret the minimum scheduling offset. For example, UE 115-a may
not know whether to interpret the minimum scheduling offset based
on the numerology of the scheduling channel or based on the
numerology of the scheduled channel if the two numerologies are
different. Based on the numerologies being different, this may
correspond to different durations of time, so UE 115-a may have
more than one interpretation for the minimum scheduling offset. In
some examples, the active uplink BWP may have a different
numerology than the active downlink BWP, and base station 105-a may
schedule an uplink transmission that has a different numerology
than the PDCCH (e.g., with or without uplink BWP switching). In
another example, the scheduling PDCCH and a scheduled PDSCH on a
target BWP may have different numerologies (e.g., in which case
downlink BWP switching may be triggered). In another example, base
station 105-a may schedule UE 115-a across component carriers with
different numerologies. For example, a control channel 215 on first
carrier 205-a may schedule UE 115-a for a transmission on carrier
205-b, when carrier 205-a and carrier 205-b have different
numerologies (e.g., different SCSs 225).
[0131] The wireless communications system 200 may implement
techniques and configurations to remove ambiguity for UEs 115 to
interpret the minimum scheduling offset for cross-slot scheduling
with different numerologies. In some cases, UE 115-a may interpret
the minimum scheduling offset based on signaling (e.g., an
indication) received from base station 105-a. The signaling may
semi-static signaling, such as over RRC, or base station 105-a may
include the interpretation indication in DCI. Or, in some examples,
UE 115-a may be preconfigured with the interpretation, and this
configuration may be stored in memory at UE 115-a. In one such
example, the preconfigured interpretation can be pursuant to a
definition of the minimum scheduling offset provided for in a
standards document, for example, as described in a technical
standard from the organization named "3rd Generation Partnership
Project" (3GPP).
[0132] In a first example, UE 115-a may be scheduled for an uplink
transmission, or a cross-BWP transmission, with a different
numerology than the numerology of the scheduling downlink channel.
As described above, cross-slot scheduling may provide power saving
by improving PDCCH processing. Cross-slot scheduling may relax the
PDCCH processing timeline and enhance (e.g., maximize) the duration
of microsleep from the end of the last PDCCH symbol to the start of
the next PDCCH occasion. In this example, the minimum scheduling
offset may be defined in terms of the PDCCH slot configuration.
When applying the minimum scheduling offset to scheduling PDSCH or
PUSCH with a different numerology, the offset may be converted
based on the numerology of the scheduled channel.
[0133] For example, X may be the minimum scheduling offset, and
PDCCH may be received in slot n. The subcarrier spacing (SCS) of
the PDCCH may be 2 .mu.PDCCH, and the SCS of the PDSCH may be 2
.mu.PDSCH. UE 115-a may not expect to be indicated for downlink
with a K0 less than a slot determined by Equation (1) below or a K2
less than a slot for uplink determined by Equation (2) below.
( n + X ) * 2 .mu. P D S C H 2 .mu. P D C C H ( 1 ) ( n + X ) * 2
.mu. P U S C H 2 .mu. P D C C H ( 2 ) ##EQU00001##
[0134] In an example, the SCS of a scheduling PDCCH may be 15 KHz
and may be received in slot 0. The SCS of the scheduled channel may
be 120 KHz. UE 115-a may determine that the minimum scheduling
offset is defined as X=1, UE 115-a may apply Equation (1), such
that UE 115-a determines the earliest possible scheduled slot on
the scheduled channel is slot 8, where 8=.left
brkt-top.(0+1)*120/15.right brkt-bot.. In some cases, base station
105-a may schedule UE 115-a resources in a slot which is within or
later than slot 8, which may correspond to the scheduling offset
K0.
[0135] Therefore, UE 115-a may determine a minimum scheduling
offset for a transmission on a schedulable shared channel based on
the numerology of the shared channel and the numerology of the
scheduling control channel using one of the equations above (e.g.,
Equation (1) or Equation (2)). Using the minimum scheduling offset,
UE 115-a may determine the earliest possible slot for the beginning
of a transmission on the shared channel. UE 115-a may monitor for
downlink control information on the scheduling control channel and
determine whether a cross-slot grant on the control channel was
received. If UE 115-a does not receive a cross-slot grant, UE 115-a
may operate in a low power state starting at the earliest possible
slot for the beginning of the transmission based on the minimum
scheduling offset and the lack of the grant. If UE 115-a does
receive a cross-slot grant, UE 115-a may communicate with base
station 105-a based on the resources indicated in the cross-slot
grant.
[0136] In some examples, UE 115-a may detect an error case. For
example, if UE 115-a is indicated a scheduling gap (e.g., a K0 or
K2 value) which is fewer slots than the identified minimum
scheduling gap (e.g., is less than the configured or indicated
scheduling gap threshold), UE 115-a may determine that a scheduling
error has occurred. UE 115-a may transmit an indication of the
error to base station 105-a. In some examples, RF circuitry for the
first carrier 205-a may be linked or tied to RF circuitry for the
second carrier 205-b. In these examples, UE 115-a may only turn off
the RF circuity for both carriers 205 for one or more symbol
periods if UE 115-a is not scheduled on either carrier for those
one or more symbol periods.
[0137] Techniques for determining a minimum scheduling offset in
other scenarios are described herein as well. For example, UE 115-a
may determine a minimum scheduling offset for cross-component
carrier scheduling on component carriers with different
numerologies. These examples may be described in more detail with
reference to at least FIGS. 3 and 4.
[0138] FIG. 3 illustrate examples of cross-slot scheduling
configurations 300 and 301 that supports cross-slot scheduling for
cross numerology in accordance with aspects of the present
disclosure. In some examples, cross-slot scheduling configurations
300 and 301 may implement aspects of wireless communication system
100.
[0139] Cross-slot scheduling configurations 300 and 301 may each
show an example of cross-slot scheduling where the scheduling
carrier has a different numerology than the scheduled carrier. For
example, a base station 105 may transmit a grant on PDCCH of a
downlink carrier 305 to schedule a schedulable carrier 310 for a
shared channel transmission, where the schedulable carrier 310 has
a different numerology (e.g., different SCS, different slot
configuration, slot length, etc.) than the downlink carrier 305.
Generally, a base station 105 may transmit DCI 315 on a downlink
control channel, such as PDCCH. The DCI 315 may include a grant
which schedules resources on the schedulable carrier 310 (e.g.,
shown by a scheduling 320). In some cases, the grant, if included,
may schedule resources in at least a subsequent slot (e.g., with a
scheduling gap, K0 or K2, which is greater than zero), and not in
the same slot.
[0140] The cross-slot scheduling configurations 300 and 301 may
implement techniques to support a minimum scheduling offset. The
minimum scheduling offset may enable UEs 115 implementing the
cross-slot scheduling configurations 300 and 301 to enter an
extended microsleep as described in FIG. 2. By determining
scheduling information in advance (e.g., cross-slot) and
implementing the minimum scheduling offset, a UE 115 may operate in
a low power state (e.g., by turning off some RF circuity or some
front-end hardware) for symbol periods where the UE 115 is not
scheduled for a transmission. In some cases, the minimum scheduling
offset may prevent any chances that UE 115 goes to sleep when it
may still be scheduled for a transmission. The UE 115 may determine
an earliest possible schedulable slot 325 (e.g., a beginning slot)
that may be scheduled by the grant in the DCI 315. Before the
earliest possible schedulable slot 325 may be a set of slots 330
which cannot be scheduled by a grant in the DCI 315, per the
minimum scheduling offset. The set of slots 330 may, however, be
scheduled by a previously received DCI (e.g., in a previous slot
not shown). UE 115 may be able to operate in the low power state
for some duration of the slots 300 if the durations are not
scheduled by any previously received DCI. Therefore, UE 115 may be
able to enter the low power state after DCI 315 and prior to the
beginning slot 325.
[0141] Cross-slot scheduling configuration 300 may show an example
where the downlink carrier 305 has a lower SCS than the schedulable
carrier 310. For example, downlink carrier 305-a may have an SCS of
15 KHz, and schedulable carrier 310-a may have an SCS of 120 KHz.
Cross-slot configuration 301 may show an example where the downlink
carrier 305 has a larger SCS than the schedulable carrier 310. For
example, downlink carrier 305-b may have an SCS of 120 KHz, and
schedulable carrier 310-b may have an SCS of 15 KHz.
[0142] In a first example of cross-component carrier scheduling
with different numerology, the minimum scheduling offset may be
defined according to numerology of the scheduling PDCCH (e.g., of
the scheduling component carrier). For example, the minimum
scheduling offset may be defined based on the numerology of the
downlink carrier 305. In some cases, defining the minimum
scheduling offset based on the scheduling PDCCH numerology may
reduce complexity. This may lead to additional power savings
related to PDCCH. In some cases, the minimum scheduling offset may
be similarly defined for some cross-BWP cases, which may also
reduce complexity.
[0143] In some cases, the first example may be scalable. For
example, the first example may be beneficial when the downlink
carrier 305 schedules multiple component carriers, where each of
the multiple scheduled component carriers may have a different
numerology than the downlink carrier 305. For example, the downlink
carrier 305 may schedule multiple, other carriers (e.g., one
scheduling many), including at least the schedulable carrier 310.
By basing the minimum scheduling offset configuration based on the
numerology of the downlink carrier 305, the UE 115 may be
configured for new component carriers or drop component carriers
without having to adjust or reconfigure the definition of the
minimum scheduling offset.
[0144] In an example applying the first example to the cross-slot
scheduling configuration 300, the minimum scheduling offset, X, may
be set to 1. DCI 315-a, transmitted in slot 0 of downlink carrier
305-a, may, at the earliest, schedule slot 325-a in the eighth slot
of schedulable carrier 310-a. For example, by applying Equation (1)
for downlink, or Equation (2) for uplink, to the described
scenario, the earliest possible schedulable slot 325-a may be slot
8, where .left brkt-top.(0+1)*8.right brkt-bot.=8. UE 115-a may
apply this equation to identify the minimum scheduling offset (when
indicated) and use the minimum scheduling offset when determining
to operate in a low power mode.
[0145] In an example applying the first example to the cross-slot
scheduling configuration 301, the minimum scheduling offset, X, may
be set to 4. DCI 315-b, transmitted in slot 0 of downlink carrier
305-b, may, at the earliest, schedule slot 325-b in the second slot
of schedulable carrier 310-b. For example, by applying Equation (1)
for downlink, or Equation (2) for uplink, to the described
scenario, the earliest possible schedulable slot 325-b may be slot
1, where .left brkt-top.(0+4)*1/8.right brkt-bot.=1. UE 115-a may
apply this equation to interpret the minimum scheduling offset in
terms of the scheduling PDCCH and use this interpretation of the
minimum scheduling offset when determining to operate in a low
power mode.
[0146] In a second example of cross-component carrier scheduling
with different numerologies, the minimum scheduling offset may be
defined according to the numerology of the scheduled component
carrier. The minimum scheduling offset may be defined in the
scheduled PDSCH or PUSCH numerology. For example, the UE 115 may
interpret the minimum scheduling offset based on the numerology of
the schedulable carrier 310. In some cases, defining the minimum
scheduling offset based on the scheduled component carrier
numerology may reduce complexity when integrating these techniques
with some other cross-carrier scheduling techniques. For example,
the minimum scheduling offset may be defined according to a delta
and a quantization, which may be based on the scheduled component
carrier slot. Further, the second example may provide fine
granularity definition for the earliest possible schedulable slot
325.
[0147] In an example applying the second example to the cross-slot
scheduling configuration 301, the minimum scheduling offset, X, may
be set to 8. DCI 315-b, transmitted in slot 0 of downlink carrier
305-b, may schedule slot 325-b in the eighth slot of schedulable
carrier 310-b at the earliest. In an example applying the second
example to the cross-slot scheduling configuration 301, the minimum
scheduling offset, X, may be set to 1. DCI 315-b, transmitted in
slot 0 of downlink carrier 305-b, may, at the earliest, schedule
slot 325-b in slot 1 of schedulable carrier 310-b.
[0148] In some cases of the second example, such as for a low SCS
carrier scheduling a high SCS carrier, a minimum scheduling offset
may only be well defined for certain situations. For example, K0
numbering may be with respect to the first slot that overlaps with
the scheduling slot. Additionally, or alternatively, the K0
reference may be the same regardless of the position of the PDCCH.
For example, if the PDCCH occasion is late in the scheduling slot,
or there are multiple PDCCH occasions within a slot, the K0 of the
second example may not be well defined. To ensure similar time
delay from the PDCCH to the scheduled slot, a much larger minimum
K0 may be over-provisioned. Some examples of over-provisioned
scheduling gaps are described with reference to FIG. 4.
[0149] FIG. 4 illustrates an example of cross-slot scheduling
configurations 400, 401, and 402 that support cross-slot scheduling
for cross numerology in accordance with aspects of the present
disclosure. In some examples, cross-slot scheduling configurations
400, 401, and 402 may implement aspects of wireless communication
system 100.
[0150] Cross-slot scheduling configurations 400, 401, and 402 may
each show an example of cross-slot scheduling where the scheduling
carrier has a different numerology than the scheduled carrier. For
example, a base station 105 may transmit a grant on PDCCH of a
downlink carrier 405 to schedule a schedulable carrier 410, where
the schedulable carrier 410 has a different numerology (e.g., SCS,
slot configuration, etc.) than the downlink carrier 405. Generally,
a base station 105 may transmit DCI 415 on a downlink control
channel, such as PDCCH. The DCI 415 may include a grant which may
schedule resources on the schedulable carrier 410 (e.g., shown by a
scheduling 420). In some cases, the grant, if included, may
schedule resources in at least a subsequent slot (e.g., with a
scheduling gap, K0 or K2, which is greater than zero), and not in
the same slot.
[0151] The cross-slot scheduling configurations 400, 401, and 402
may implement techniques to support a minimum scheduling offset.
The minimum scheduling offset may enable UEs 115 implementing the
cross-slot scheduling configurations 400, 401, and 402 to enter an
extended microsleep as described in FIG. 2. By determining
scheduling information in advance (e.g., cross-slot) and
implementing the minimum scheduling offset, a UE 115 may operate in
a low power state (e.g., by turning off some RF circuity or some
front-end hardware) for symbol periods where the UE 115 is not
scheduled for a transmission. The UE 115 may determine an earliest
possible schedulable slot 425 that may be scheduled by the grant in
the DCI 415. Before the earliest possible schedulable slot 425 may
be a set of slots 430 which cannot be scheduled by a grant in the
DCI 415, per the minimum scheduling offset. The set of slots 430
may, however, be scheduled by a previously received DCI (e.g., in a
previous slot not shown).
[0152] Cross-slot scheduling configurations 400, 401, and 402 may
each show an example where the downlink carrier 405 has a lower SCS
than schedulable carrier 410. For example, downlink carrier 405-a
may have an SCS of 15 KHz, and schedulable carrier 410-a may have
an SCS of 120 KHz. In some other examples, the downlink carrier 405
may have a larger SCS than the schedulable carrier 410, or the
ratio between the SCS of the downlink carrier 405 and the SCS of
the schedulable carrier 410 may be different.
[0153] The cross-slot scheduling configurations 400 and 401 may
show examples where a minimum scheduling gap is over-provisioned.
As described in FIG. 3, there may be situations where defining the
minimum scheduling offset based on the numerology of the
schedulable carrier 410 may lead to an over-provisioned scheduling
offset. Generally, an over-provisioned scheduling offset may lead
to a significantly larger set of slots 430 which are excluded from
scheduling. This may lead to increased latency for the data.
[0154] In some cases, the UE 115 may decide to go into the low
power state right after the end of the DCI 415, as the UE 115 may
know that even if the DCI 415 carries a scheduling grant, the grant
may schedule resources in a later slot (e.g., in the future). The
UE 115 may determine to go into the low power state without waiting
for the PDCCH processing and decoding of the DCI 415.
[0155] In the cross-slot scheduling configuration 400, DCI 415-a
may be transmitted later in slot 0, not right at the beginning
symbol period. For example, DCI 415-a may be transmitted during
slot 5 and 6 of schedulable carrier 410-a. However, in some cases,
the minimum scheduling offset may be numbered with respect to the
first slot of the schedulable carrier 410-a that overlaps with the
scheduling slot. In an example of a downlink data transmission
based on the cross-slot scheduling configuration 400, the UE 115
may identify that the minimum K0 is equal to 14, interpreted based
on the PDSCH numerology. In this example, all of slots 0 through 13
may be included in set of slots 430-a which are excluded from
scheduling. In this example of an over-provisioned minimum
scheduling offset, some of the earlier slots on the schedulable
carrier 410-a could have been scheduled for transmission, or UE 115
could be operating in a low power state from slot 8 through slot
13.
[0156] In the cross-slot scheduling configuration 401, a base
station 105 may transmit both DCI 415-b and DCI 415-c at different
points in slot 0 of the downlink carrier 405-b. For example, DCI
415-b may be transmitted during slot 0 and 1 of schedulable carrier
410-b, and DCI 415-c may be transmitted during slot 5 and 6 of
schedulable carrier 410-b. In some cases, the minimum scheduling
offset may be the same regardless of the position of the PDCCH. For
example, DCI 415-c may be very late in the slot, but to ensure a
similar time delay from the latest PDCCH occasion, a much larger
minimum scheduling offset may be over-provisioned. Therefore, DCI
415-b and DCI 415-c may indicate the same minimum scheduling
offset. In an example of a downlink data transmission in cross-slot
scheduling configuration 401, the UE 115 may determine that the
minimum K0 is equal to 14, interpreted based on the PDSCH
numerology. In this example, both DCI 415-b and DCI 415-c may
indicate the minimum K0 of 14.
[0157] The cross-slot scheduling configuration 402 may be an
example case, where the two DCI 415 may indicate different minimum
scheduling offsets. For example, DCI 415-d may indicate a minimum
scheduling offset of X=8, and DCI 415-e may indicate a minimum
scheduling offset of X=14. According to the cross-slot scheduling
configuration 402, the UE 115 may then either communicate data
starting at slot 425-c or operate in a low power state at slot
425-c until slot 425-d. Then, based on whether or not the UE 115
receives a grant in DCI 415-e, the UE 115 may either be in the low
power state from slot 425-d, or the UE 115 may be scheduled to
communicate data starting as early as slot 425-d.
[0158] FIG. 5 illustrates an example of a cross-slot scheduling
configuration 500 that supports cross-slot scheduling for cross
numerology in accordance with aspects of the present disclosure. In
some examples, cross-slot scheduling configuration 500 may
implement aspects of wireless communication system 100.
[0159] The cross-slot scheduling configuration 500 may show an
example of cross-slot scheduling where the scheduling carrier has a
different numerology than the scheduled carrier. For example, a
base station 105 may transmit a grant on PDCCH of a downlink
carrier 505 to schedule a schedulable carrier 510, where the
schedulable carrier 510 has a different numerology (e.g., SCS, slot
configuration, etc.) than the downlink carrier 505. In some cases,
the downlink carrier 505 may schedule a shared channel on the
schedulable carrier 510 for a data transmission. For example, if
the schedulable carrier 510 is an uplink carrier, the shared
channel may be an example of PUSCH. Or, if the schedulable carrier
510 is a downlink carrier, the shared channel may be an example of
PDSCH. Generally, a base station 105 may transmit DCI 515 on a
downlink control channel, such as PDCCH. The DCI 515 may include a
grant which schedules resources on the schedulable carrier 510. The
grant, if included, may schedule resources in at least a subsequent
slot (e.g., with a scheduling gap, K0 or K2, which is greater than
zero), and not in the same slot.
[0160] The cross-slot scheduling configuration 500 may implement
techniques to support a minimum scheduling offset. The minimum
scheduling offset may enable UEs 115 implementing the cross-slot
scheduling configuration 500 to enter an extended microsleep as
described in FIG. 2. By determining scheduling information in
advance (e.g., cross-slot) and implementing the minimum scheduling
offset, a UE 115 may operate in a low power state (e.g., by turning
off some RF circuity or some front-end hardware) for symbol periods
where the UE 115 is not scheduled for a transmission. The UE 115
may determine an earliest slot that can be scheduled by the grant
in the DCI 515. Slots before this determined slot may not be able
to be scheduled by a grant in the DCI 515, per the minimum
scheduling offset. Earlier slots may, however, be scheduled by a
previously received DCI (e.g., in a previous slot not shown).
[0161] The cross-slot scheduling configuration 500 may show an
example where the downlink carrier 505 has a lower SCS than
schedulable carrier 510. For example, the downlink carrier 505 may
have an SCS of 15 KHz, and schedulable carrier 510 may have an SCS
of 120 KHz. In some other examples, the downlink carrier 505 may
have a larger SCS than the schedulable carrier 510. Generally, the
SCS of the downlink carrier 505, the SCS of the schedulable carrier
510, or the SCS of both, may be different.
[0162] The cross-slot scheduling configuration 500 may show an
example of a relative definition for a minimum scheduling offset.
For cross-carrier scheduling with different numerologies, the
minimum scheduling offset may be defined based on a relative timing
difference between the scheduling PDCCH and the scheduled shared
channel (e.g., scheduled PDSCH, scheduled PUSCH), instead of
directly defining based on a scheduling gap such as K0 or K2. For
example, if a PDCCH occasion falls on slot 5-6 of the scheduled
component carrier, and the minimum scheduling offset is 7 slots
(e.g., described in terms of the numerology of the scheduled
component carrier), then the earliest scheduled PDSCH would not be
earlier than slot 13, i.e., slot 6 with a 7 slot minimum offset.
This may be different from defining a minimum scheduling offset
based on K0, where instead a minimum K0 value would be indicated as
13. The same minimum scheduling offset may be used for other PDCCH
occasions.
[0163] In an example, DCI 515-a may indicate a minimum scheduling
offset of 7. A UE 115 may receive DCI 515-a and map (e.g., at
520-a) when DCI 515-a was received to slots 0 and 1 of the
schedulable carrier 510. The UE 115 may determine, based on
receiving DCI 515-a at the same time as slot 1 of the schedulable
carrier 510 and the minimum scheduling offset of 7, that the
earliest slot 525-a that can be scheduled by DCI 515-a would be
slot 8 (e.g., DCI 515-a is received in slot 1 with a 7 slot minimum
scheduling offset). The UE 115 may receive DCI 515-b in the same
slot. The UE 115 may map (e.g., at 520-b) when DCI 515-b was
received to slots 5 and 6 of the schedulable carrier 510. Using the
same minimum scheduling offset, the UE 115 may determine that the
earliest slot 525-b that can be scheduled by DCI 515-b would be
slot 13 (e.g., DCI 515-b is received in slot 6 with a 7 slot
minimum scheduling offset). In some cases, the scheduling offset
itself may indicate whether the scheduling offset is defined by the
first numerology or second numerology. Or, in some cases, the
definition of the minimum scheduling offset may be preconfigured or
stored in memory at the UE 115.
[0164] The techniques of the cross-slot scheduling configuration
500 may increase throughput (e.g., if the UE 115 is scheduled for a
transmission) or extend the duration of microsleep for the UE 115.
In some cases, the techniques for the cross-slot scheduling
configuration 500 may prevent the over-provisioning described with
reference to some examples of FIG. 4. In some cases, the
application time of minimum scheduling offset change may implement
similar techniques or use a similar definition. For example, the
base station 105 may signal or reconfigure the application time of
the minimum scheduling offset change, and the UE 115 may apply the
minimum scheduling offset change to slots occurring after the
allocation time.
[0165] FIG. 6 illustrates an example of a process flow 600 that
supports cross-slot scheduling for cross numerology in accordance
with aspects of the present disclosure. In some examples, process
flow 600 may implement aspects of wireless communication system
100. Process flow 600 may include UE 115-b and base station 105-b,
which may be respective examples of a UE 115 and a base station 105
as described herein.
[0166] At 605, base station 105-b may, in some cases, transmit
control signaling that indicates a scheduling offset threshold
corresponding to a cross-slot grant. The scheduling offset
threshold may be an example of a minimum scheduling offset as
described herein. The scheduling offset threshold may indicate a
minimum number of slots which offset a scheduled shared channel
from a scheduling PDCCH. In some cases, the scheduling offset
threshold may be one slot or more, such that the scheduling offset
threshold (e.g., the minimum scheduling offset) prevents same-slot
scheduling and enables only cross-slot scheduling.
[0167] At 610, UE 115-b may identify the scheduling offset
threshold corresponding to the cross-slot grant. In some cases, UE
115-b may receive multiple different candidate scheduling offset
thresholds from local storage of UE 115-b, the multiple different
candidate scheduling offset thresholds being preconfigured (e.g.,
in a technical specification, by prior signaling from the base
station 105-b, etc.). In some cases, UE 115-b may receive the layer
one control signaling indicating the scheduling offset threshold
from the multiple different candidate scheduling offset thresholds.
In some cases, the scheduling offset threshold may correspond to a
minimum scheduling offset (e.g., in a number of slots) or a minimum
applicable value.
[0168] At 615, UE 115-b may monitor a control channel in a first
slot for the cross-slot grant, the control channel having a first
numerology that is different than a second numerology of a shared
channel. In some cases, the scheduling offset threshold identified
at 610 may indicate a number of slots defined in the first
numerology. Or, in some cases, the scheduling offset threshold may
indicate a number of slots defined in the second numerology. In
some cases, the scheduling offset itself may indicate whether the
scheduling offset is defined by the first numerology or second
numerology. Or, in some cases, the definition of the minimum
scheduling offset may be preconfigured or stored in memory at UE
115-b. The control channel may be an example of a scheduling PDCCH
described herein, which may carry a cross-slot grant to schedule a
shared channel that has a different numerology.
[0169] At 620, base station 105-b may, in some cases, transmit, in
a first slot, the cross-slot grant in a control channel that has
the first numerology that is different from the second numerology
of the shared channel. In some examples, UE 115-b may receive the
cross-slot grant via a first component carrier that is defined in
the first numerology. In some cases, the cross-slot grant may
schedule the data transmission on the shared channel via a second
component carrier that is defined in the second numerology. This
may be an example of cross-component carrier scheduling, where the
two component carriers have different numerologies.
[0170] Or, in some cases, UE 115-b may receive the cross-slot grant
in a downlink bandwidth part having the first numerology, the
cross-slot grant scheduling the data transmission as an uplink
transmission on the shared channel in an active uplink bandwidth
part having the second numerology. This may be an example of a
downlink BWP having a different numerology than an uplink BWP,
which may be described in more detail with reference to FIG. 2. In
some examples, the cross-slot grant may additionally, or
alternatively, schedule a target uplink BWP with the second
numerology to initiate uplink BWP switching.
[0171] In some cases, UE 115-b may receive the cross-slot grant in
a downlink bandwidth part having the first numerology, the
cross-slot grant scheduling the data transmission as a downlink
transmission on the shared channel in a target downlink bandwidth
part having the second numerology. In some cases, this may be an
example of BWP switching for downlink, where the shared channel is
a downlink shared channel (e.g., PDSCH) which is scheduled for a
target BWP.
[0172] At 625-a, UE 115-b may determine a beginning slot defined in
the second numerology based on the scheduling offset threshold. For
example, UE 115-b may determine the beginning slot based on
interpreting the scheduling offset threshold as being defined in
the first numerology or the second numerology. Base station 105-b
may similarly determine the beginning slot at 625-b. For example,
the minimum scheduling offset may be defined based on the
numerology of the scheduling PDCCH or based on the numerology of
the scheduled shared channel.
[0173] In some cases, UE 115-b may convert the scheduling offset
threshold to a second scheduling offset threshold in the second
numerology. For example, the scheduling offset threshold may be
defined in the first numerology, and UE 115-b may determine the
beginning slot based on the second scheduling offset threshold.
This may be an example of converting the scheduling offset
threshold from the numerology of the scheduling PDCCH to the
numerology of the scheduled shared channel, for example by applying
Equation (1) or Equation (2) described with reference to FIG. 2.
Some examples of this conversion for cross-carrier scheduling may
be described with reference to FIG. 3.
[0174] In some examples, UE 115-b may determine the beginning of
the slot relative to the control channel based on the scheduling
offset threshold. In this example, UE 115-b may determine the
beginning slot based on when the cross-slot grant is received. An
example of this may be described in more detail with reference to
FIG. 5.
[0175] UE 115-b may then either operate in a low power state or
communicate a data transmission during the beginning slot based on
whether UE 115-b detected the cross-slot grant. For example, if
base station 105-b did not transmit the cross-slot grant at 620, UE
115-b may be able to enter a low power mode (e.g., go into
microsleep) starting at the beginning slot at 630. For example, UE
115-b may operate in the low power state based on determining that
the cross-slot grant has not been detected.
[0176] Or, if base station 105-b did transmit the cross-slot grant,
UE 115-b may be scheduled to communicate data. Therefore, UE 115-b
may wait until the first scheduled slot to begin communicating
data, then start communicating the data transmission based on
detecting the cross-slot grant at 635. In some cases, the first
slot for the data transmission may be the same or different as the
beginning slot as determined at 625.
[0177] FIG. 7 shows a block diagram 700 of a device 705 that
supports cross-slot scheduling for cross numerology in accordance
with aspects of the present disclosure. The device 705 may be an
example of aspects of a UE 115 as described herein. The device 705
may include a receiver 710, a communications manager 715, and a
transmitter 720. The device 705 may also include a processor. Each
of these components may be in communication with one another (e.g.,
via one or more buses).
[0178] The receiver 710 may receive information such as packets,
user data, or control information associated with various
information channels (e.g., control channels, data channels, and
information related to cross-slot scheduling for cross numerology,
etc.). Information may be passed on to other components of the
device 705. The receiver 710 may be an example of aspects of the
transceiver 1020 described with reference to FIG. 10. The receiver
710 may utilize a single antenna or a set of antennas.
[0179] The communications manager 715 may identify a scheduling
offset threshold corresponding to a cross-slot grant, monitor a
control channel in a first slot for the cross-slot grant, the
control channel having a first numerology that is different than a
second numerology of a shared channel, determine a beginning slot
defined in the second numerology based on interpreting the
scheduling offset threshold as being defined in the first
numerology or the second numerology, and operate in a low power
state, or communicating a data transmission, during the beginning
slot based on whether the cross-slot grant is detected. The
communications manager 715 may be an example of aspects of the
communications manager 1010 described herein.
[0180] The communications manager 715, or its sub-components, may
be implemented in hardware, code (e.g., software or firmware)
executed by a processor, or any combination thereof. If implemented
in code executed by a processor, the functions of the
communications manager 715, or its sub-components may be executed
by a general-purpose processor, a DSP, an application-specific
integrated circuit (ASIC), a FPGA or other programmable logic
device, discrete gate or transistor logic, discrete hardware
components, or any combination thereof designed to perform the
functions described in the present disclosure.
[0181] The communications manager 715, or its sub-components, may
be physically located at various positions, including being
distributed such that portions of functions are implemented at
different physical locations by one or more physical components. In
some examples, the communications manager 715, or its
sub-components, may be a separate and distinct component in
accordance with various aspects of the present disclosure. In some
examples, the communications manager 715, or its sub-components,
may be combined with one or more other hardware components,
including but not limited to an input/output (I/O) component, a
transceiver, a network server, another computing device, one or
more other components described in the present disclosure, or a
combination thereof in accordance with various aspects of the
present disclosure.
[0182] The actions performed by the UE communications manager 715
as described herein may be implemented to realize one or more
potential advantages. One implementation may allow a UE 115 to save
power and increase battery life by staying in a low power mode and
powering down some RF and front-end hardware functionalities.
Additionally, or alternatively, the UE 115 may further reduce the
extent in which it processes PDCCH signaling while in a full power
mode, as the UE 115 may instead perform the PDCCH processing while
in the low power mode. These power saving advantages may be
realized without a significant decrease in throughput for the UE
115.
[0183] The transmitter 720 may transmit signals generated by other
components of the device 705. In some examples, the transmitter 720
may be collocated with a receiver 710 in a transceiver module. For
example, the transmitter 720 may be an example of aspects of the
transceiver 1020 described with reference to FIG. 10. The
transmitter 720 may utilize a single antenna or a set of
antennas.
[0184] FIG. 8 shows a block diagram 800 of a device 805 that
supports cross-slot scheduling for cross numerology in accordance
with aspects of the present disclosure. The device 805 may be an
example of aspects of a device 705, or a UE 115 as described
herein. The device 805 may include a receiver 810, a communications
manager 815, and a transmitter 840. The device 805 may also include
a processor. Each of these components may be in communication with
one another (e.g., via one or more buses).
[0185] The receiver 810 may receive information such as packets,
user data, or control information associated with various
information channels (e.g., control channels, data channels, and
information related to cross-slot scheduling for cross numerology,
etc.). Information may be passed on to other components of the
device 805. The receiver 810 may be an example of aspects of the
transceiver 1020 described with reference to FIG. 10. The receiver
810 may utilize a single antenna or a set of antennas.
[0186] The communications manager 815 may be an example of aspects
of the communications manager 715 as described herein. The
communications manager 815 may include a scheduling offset
threshold identifying component 820, a control channel monitoring
component 825, a beginning slot determining component 830, and a
low power state component 835. The communications manager 815 may
be an example of aspects of the communications manager 1010
described herein.
[0187] The scheduling offset threshold identifying component 820
may identify a scheduling offset threshold corresponding to a
cross-slot grant.
[0188] The control channel monitoring component 825 may monitor a
control channel in a first slot for the cross-slot grant, the
control channel having a first numerology that is different than a
second numerology of a shared channel.
[0189] The beginning slot determining component 830 may determine a
beginning slot defined in the second numerology based on
interpreting the scheduling offset threshold as being defined in
the first numerology or the second numerology.
[0190] The low power state component 835 may operate in a low power
state, or communicating a data transmission, during the beginning
slot based on whether the cross-slot grant is detected.
[0191] The transmitter 840 may transmit signals generated by other
components of the device 805. In some examples, the transmitter 840
may be collocated with a receiver 810 in a transceiver module. For
example, the transmitter 840 may be an example of aspects of the
transceiver 1020 described with reference to FIG. 10. The
transmitter 840 may utilize a single antenna or a set of
antennas.
[0192] FIG. 9 shows a block diagram 900 of a communications manager
905 that supports cross-slot scheduling for cross numerology in
accordance with aspects of the present disclosure. The
communications manager 905 may be an example of aspects of a
communications manager 715, a communications manager 815, or a
communications manager 1010 described herein. The communications
manager 905 may include a scheduling offset threshold identifying
component 910, a control channel monitoring component 915, a
beginning slot determining component 920, a low power state
component 925, a cross-slot grant receiving component 930, and a
multiple cross-slot grant component 935. Each of these modules may
communicate, directly or indirectly, with one another (e.g., via
one or more buses).
[0193] The scheduling offset threshold identifying component 910
may identify a scheduling offset threshold corresponding to a
cross-slot grant.
[0194] In some examples, the scheduling offset threshold
identifying component 910 may retrieve a set of different candidate
scheduling offset thresholds from local storage of the UE, the set
of different candidate scheduling offset thresholds being
preconfigured.
[0195] In some examples, the scheduling offset threshold
identifying component 910 may receive layer one control signaling
indicating the scheduling offset threshold from the set of
different candidate scheduling offset thresholds.
[0196] In some examples, the scheduling offset threshold
identifying component 910 may interpret the scheduling offset
threshold as being defined in the first numerology or the second
numerology based at least in part on a preconfiguration or received
control signaling (e.g., from base station 105).
[0197] In some cases, the scheduling offset threshold indicates a
number of slots defined in the first numerology.
[0198] In some cases, the scheduling offset threshold indicates a
number of slots defined in the second numerology.
[0199] In some cases, the scheduling offset threshold corresponds
to a minimum scheduling offset or a minimum applicable value.
[0200] The control channel monitoring component 915 may monitor a
control channel in a first slot for the cross-slot grant, the
control channel having a first numerology that is different than a
second numerology of a shared channel.
[0201] In some cases, the control channel of the first slot
includes a beginning symbol period of the first slot, and where the
scheduling offset threshold indicates a number of symbol periods
defined in the second numerology relative to the control
channel.
[0202] The beginning slot determining component 920 may determine a
beginning slot defined in the second numerology based on
interpreting the scheduling offset threshold as being defined in
the first numerology or the second numerology.
[0203] In some examples, the beginning slot determining component
920 may convert the scheduling offset threshold to a second
scheduling offset threshold in the second numerology, the
scheduling offset threshold being defined in the first
numerology.
[0204] In some examples, the beginning slot determining component
920 may determine the beginning slot based on the second scheduling
offset threshold.
[0205] In some examples, the beginning slot determining component
920 may determine the beginning slot relative to the control
channel based on the scheduling offset threshold.
[0206] In some examples, the beginning slot determining component
920 may determine the beginning slot based on the scheduling offset
threshold and a second scheduling offset indicated in the
cross-slot grant.
[0207] In some examples, the beginning slot determining component
920 may determine that the cross-slot grant is invalid based on the
second scheduling offset having a shorter duration than the
scheduling offset threshold.
[0208] In some examples, the beginning slot determining component
920 may operate in the low power state based on determining that
the cross-slot grant is invalid.
[0209] In some cases, the control channel of the first slot occurs
after a beginning symbol period of the first slot, and where the
scheduling offset threshold indicates a number of symbol periods
defined in the second numerology relative to a beginning of the
control channel.
[0210] The low power state component 925 may operate in a low power
state, or communicating a data transmission, during the beginning
slot based on whether the cross-slot grant is detected.
[0211] In some examples, the low power state component 925 may
operate in the low power state based on determining that the
cross-slot grant has not been detected.
[0212] In some examples, the low power state component 925 may
receive or transmitting the data transmission based on receiving
the cross-slot grant.
[0213] In some examples, the low power state component 925 may
control at least one radio frequency chain to operate in the low
power state based on whether the cross-slot grant is detected.
[0214] The cross-slot grant receiving component 930 may receive the
cross-slot grant in a downlink bandwidth part having the first
numerology, the cross-slot grant scheduling the data transmission
as an uplink transmission on the shared channel in an active uplink
bandwidth part having the second numerology.
[0215] In some examples, the cross-slot grant receiving component
930 may switch from a first uplink bandwidth part to the active
uplink bandwidth part based on receiving the cross-slot grant.
[0216] In some examples, the cross-slot grant receiving component
930 may receive the cross-slot grant in a downlink bandwidth part
having the first numerology, the cross-slot grant scheduling the
data transmission as a downlink transmission on the shared channel
in a target downlink bandwidth part having the second
numerology.
[0217] In some examples, the cross-slot grant receiving component
930 may switch from a first downlink bandwidth part to the target
downlink bandwidth part based on receiving the cross-slot
grant.
[0218] In some examples, the cross-slot grant receiving component
930 may receive the cross-slot grant via a first component carrier
that is defined in the first numerology, the cross-slot grant
scheduling the data transmission on the shared channel via a second
component carrier that is defined in the second numerology.
[0219] The multiple cross-slot grant component 935 may receive, via
a second control channel of the first slot, a second cross-slot
grant.
[0220] In some examples, the multiple cross-slot grant component
935 may determine the beginning slot relative to the control
channel based on the scheduling offset threshold and a second
scheduling offset indicated in the cross-slot grant.
[0221] In some examples, the multiple cross-slot grant component
935 may determine a second beginning slot relative to the second
control channel based on the scheduling offset threshold and a
third scheduling offset indicated in the second cross-slot
grant.
[0222] In some examples, the multiple cross-slot grant component
935 may determine the beginning slot relative to the control
channel based on the relative timing difference.
[0223] In some examples, the multiple cross-slot grant component
935 may determine the second beginning slot of the shared channel
relative to the second control channel based on the relative timing
difference.
[0224] In some examples, the multiple cross-slot grant component
935 may receive control signaling indicating a change to the
scheduling offset threshold.
[0225] In some examples, the multiple cross-slot grant component
935 may apply the change to the scheduling offset threshold in a
slot occurring after the beginning slot.
[0226] In some examples, the multiple cross-slot grant component
935 may map an ending symbol period of the control channel to a
shared channel slot of the shared channel defined in the second
numerology.
[0227] In some examples, the multiple cross-slot grant component
935 may determine the beginning slot based on the shared channel
slot and the relative timing difference.
[0228] In some cases, the scheduling offset threshold indicates a
number of symbol periods defined in the second numerology.
[0229] In some cases, the scheduling offset threshold indicates a
relative timing difference.
[0230] FIG. 10 shows a diagram of a system 1000 including a device
1005 that supports cross-slot scheduling for cross numerology in
accordance with aspects of the present disclosure. The device 1005
may be an example of or include the components of device 705,
device 805, or a UE 115 as described herein. The device 1005 may
include components for bi-directional voice and data communications
including components for transmitting and receiving communications,
including a communications manager 1010, an I/O controller 1015, a
transceiver 1020, an antenna 1025, memory 1030, and a processor
1040. These components may be in electronic communication via one
or more buses (e.g., bus 1045).
[0231] The communications manager 1010 may identify a scheduling
offset threshold corresponding to a cross-slot grant, monitor a
control channel in a first slot for the cross-slot grant, the
control channel having a first numerology that is different than a
second numerology of a shared channel, determine a beginning slot
defined in the second numerology based on interpreting the
scheduling offset threshold as being defined in the first
numerology or the second numerology, and operate in a low power
state, or communicating a data transmission, during the beginning
slot based on whether the cross-slot grant is detected.
[0232] The I/O controller 1015 may manage input and output signals
for the device 1005. The I/O controller 1015 may also manage
peripherals not integrated into the device 1005. In some cases, the
I/O controller 1015 may represent a physical connection or port to
an external peripheral. In some cases, the I/O controller 1015 may
utilize an operating system such as iOS.RTM., ANDROID.RTM.,
MS-DOS.RTM., MS-WINDOWS.RTM., OS/2.RTM., UNIX.RTM., LINUX.RTM., or
another known operating system. In other cases, the I/O controller
1015 may represent or interact with a modem, a keyboard, a mouse, a
touchscreen, or a similar device. In some cases, the I/O controller
1015 may be implemented as part of a processor. In some cases, a
user may interact with the device 1005 via the I/O controller 1015
or via hardware components controlled by the I/O controller
1015.
[0233] The transceiver 1020 may communicate bi-directionally, via
one or more antennas, wired, or wireless links as described above.
For example, the transceiver 1020 may represent a wireless
transceiver and may communicate bi-directionally with another
wireless transceiver. The transceiver 1020 may also include a modem
to modulate the packets and provide the modulated packets to the
antennas for transmission, and to demodulate packets received from
the antennas.
[0234] In some cases, the wireless device may include a single
antenna 1025. However, in some cases the device may have more than
one antenna 1025, which may be capable of concurrently transmitting
or receiving multiple wireless transmissions.
[0235] The memory 1030 may include RAM and ROM. The memory 1030 may
store computer-readable, computer-executable code 1035 including
instructions that, when executed, cause the processor to perform
various functions described herein. In some cases, the memory 1030
may contain, among other things, a BIOS which may control basic
hardware or software operation such as the interaction with
peripheral components or devices.
[0236] The processor 1040 may include an intelligent hardware
device, (e.g., a general-purpose processor, a DSP, a CPU, a
microcontroller, an ASIC, an FPGA, a programmable logic device, a
discrete gate or transistor logic component, a discrete hardware
component, or any combination thereof). In some cases, the
processor 1040 may be configured to operate a memory array using a
memory controller. In other cases, a memory controller may be
integrated into the processor 1040. The processor 1040 may be
configured to execute computer-readable instructions stored in a
memory (e.g., the memory 1030) to cause the device 1005 to perform
various functions (e.g., functions or tasks supporting cross-slot
scheduling for cross numerology).
[0237] The code 1035 may include instructions to implement aspects
of the present disclosure, including instructions to support
wireless communications. The code 1035 may be stored in a
non-transitory computer-readable medium such as system memory or
other type of memory. In some cases, the code 1035 may not be
directly executable by the processor 1040 but may cause a computer
(e.g., when compiled and executed) to perform functions described
herein.
[0238] Based on extending the duration of the UE 115 in the power
saving mode, a processor of a UE 115 (e.g., controlling the
receiver 810, the transmitter 840, or the transceiver 1020 as
described with reference to FIG. 10) may be able to save power or
reallocate processing power to other functions than monitoring.
Further, the RF circuity may be able to cool down or refrain from
using significant power while in the low power mode. This may
increase longevity of different components of the device while
preserving the device's battery life.
[0239] FIG. 11 shows a block diagram 1100 of a device 1105 that
supports cross-slot scheduling for cross numerology in accordance
with aspects of the present disclosure. The device 1105 may be an
example of aspects of a base station 105 as described herein. The
device 1105 may include a receiver 1110, a communications manager
1115, and a transmitter 1120. The device 1105 may also include a
processor. Each of these components may be in communication with
one another (e.g., via one or more buses).
[0240] The receiver 1110 may receive information such as packets,
user data, or control information associated with various
information channels (e.g., control channels, data channels, and
information related to cross-slot scheduling for cross numerology,
etc.). Information may be passed on to other components of the
device 1105. The receiver 1110 may be an example of aspects of the
transceiver 1420 described with reference to FIG. 14. The receiver
1110 may utilize a single antenna or a set of antennas.
[0241] The communications manager 1115 may transmit control
signaling that indicates a scheduling offset threshold
corresponding to a cross-slot grant, transmit, in a first slot, the
cross-slot grant in a control channel that has a first numerology
that is different than a second numerology of a shared channel,
determine a beginning slot in the second numerology based on the
scheduling offset threshold being defined in the first numerology
or the second numerology, and transmit or receiving a data
transmission during the beginning slot based on the cross-slot
grant. The communications manager 1115 may be an example of aspects
of the communications manager 1410 described herein.
[0242] The communications manager 1115, or its sub-components, may
be implemented in hardware, code (e.g., software or firmware)
executed by a processor, or any combination thereof. If implemented
in code executed by a processor, the functions of the
communications manager 1115, or its sub-components may be executed
by a general-purpose processor, a DSP, an application-specific
integrated circuit (ASIC), a FPGA or other programmable logic
device, discrete gate or transistor logic, discrete hardware
components, or any combination thereof designed to perform the
functions described in the present disclosure.
[0243] The communications manager 1115, or its sub-components, may
be physically located at various positions, including being
distributed such that portions of functions are implemented at
different physical locations by one or more physical components. In
some examples, the communications manager 1115, or its
sub-components, may be a separate and distinct component in
accordance with various aspects of the present disclosure. In some
examples, the communications manager 1115, or its sub-components,
may be combined with one or more other hardware components,
including but not limited to an input/output (I/O) component, a
transceiver, a network server, another computing device, one or
more other components described in the present disclosure, or a
combination thereof in accordance with various aspects of the
present disclosure.
[0244] The transmitter 1120 may transmit signals generated by other
components of the device 1105. In some examples, the transmitter
1120 may be collocated with a receiver 1110 in a transceiver
module. For example, the transmitter 1120 may be an example of
aspects of the transceiver 1420 described with reference to FIG.
14. The transmitter 1120 may utilize a single antenna or a set of
antennas.
[0245] FIG. 12 shows a block diagram 1200 of a device 1205 that
supports cross-slot scheduling for cross numerology in accordance
with aspects of the present disclosure. The device 1205 may be an
example of aspects of a device 1105, or a base station 105 as
described herein. The device 1205 may include a receiver 1210, a
communications manager 1215, and a transmitter 1240. The device
1205 may also include a processor. Each of these components may be
in communication with one another (e.g., via one or more
buses).
[0246] The receiver 1210 may receive information such as packets,
user data, or control information associated with various
information channels (e.g., control channels, data channels, and
information related to cross-slot scheduling for cross numerology,
etc.). Information may be passed on to other components of the
device 1205. The receiver 1210 may be an example of aspects of the
transceiver 1420 described with reference to FIG. 14. The receiver
1210 may utilize a single antenna or a set of antennas.
[0247] The communications manager 1215 may be an example of aspects
of the communications manager 1115 as described herein. The
communications manager 1215 may include a control signaling
component 1220, a cross-slot grant transmitting component 1225, a
beginning slot determining component 1230, and a data communicating
component 1235. The communications manager 1215 may be an example
of aspects of the communications manager 1410 described herein.
[0248] The control signaling component 1220 may transmit control
signaling that indicates a scheduling offset threshold
corresponding to a cross-slot grant.
[0249] The cross-slot grant transmitting component 1225 may
transmit, in a first slot, the cross-slot grant in a control
channel that has a first numerology that is different than a second
numerology of a shared channel.
[0250] The beginning slot determining component 1230 may determine
a beginning slot in the second numerology based on the scheduling
offset threshold being defined in the first numerology or the
second numerology.
[0251] The data communicating component 1235 may transmit or
receiving a data transmission during the beginning slot based on
the cross-slot grant.
[0252] The transmitter 1240 may transmit signals generated by other
components of the device 1205. In some examples, the transmitter
1240 may be collocated with a receiver 1210 in a transceiver
module. For example, the transmitter 1240 may be an example of
aspects of the transceiver 1420 described with reference to FIG.
14. The transmitter 1240 may utilize a single antenna or a set of
antennas.
[0253] FIG. 13 shows a block diagram 1300 of a communications
manager 1305 that supports cross-slot scheduling for cross
numerology in accordance with aspects of the present disclosure.
The communications manager 1305 may be an example of aspects of a
communications manager 1115, a communications manager 1215, or a
communications manager 1410 described herein. The communications
manager 1305 may include a control signaling component 1310, a
cross-slot grant transmitting component 1315, a beginning slot
determining component 1320, a data communicating component 1325,
and a multiple cross-slot grant component 1330. Each of these
modules may communicate, directly or indirectly, with one another
(e.g., via one or more buses).
[0254] The control signaling component 1310 may transmit control
signaling that indicates a scheduling offset threshold
corresponding to a cross-slot grant.
[0255] In some examples, the control signaling component 1310 may
transmit layer one control signaling indicating the scheduling
offset threshold from a set of different candidate scheduling
offset thresholds.
[0256] In some cases, the scheduling offset threshold indicates a
number of slots defined in the first numerology.
[0257] In some cases, the scheduling offset threshold indicates a
number of slots defined in the second numerology.
[0258] In some cases, the scheduling offset threshold is a minimum
scheduling offset threshold.
[0259] In some cases, the control channel of the first slot occurs
after a beginning symbol period of the first slot, and where the
scheduling offset threshold indicates a number of symbol periods in
the second numerology relative to a beginning of the control
channel.
[0260] In some cases, the control channel of the first slot
includes a beginning symbol period of the first slot, and where the
scheduling offset threshold indicates a number of symbol periods
defined in the second numerology relative to the control
channel.
[0261] The cross-slot grant transmitting component 1315 may
transmit, in a first slot, the cross-slot grant in a control
channel that has a first numerology that is different than a second
numerology of a shared channel.
[0262] In some examples, the cross-slot grant transmitting
component 1315 may transmit the cross-slot grant in a downlink
bandwidth part having the first numerology, the cross-slot grant
scheduling the data transmission as an uplink transmission on the
shared channel in an active uplink bandwidth part having the second
numerology.
[0263] In some examples, the cross-slot grant transmitting
component 1315 may transmit the cross-slot grant in a downlink
bandwidth part having the first numerology, the cross-slot grant
scheduling the data transmission as a downlink transmission on the
shared channel in a target uplink bandwidth part having the second
numerology.
[0264] In some examples, the cross-slot grant transmitting
component 1315 may transmit the cross-slot grant via a first
component carrier that is defined in the first numerology, the
cross-slot grant scheduling the data transmission on the shared
channel via a second component carrier that is defined in the
second numerology.
[0265] The beginning slot determining component 1320 may determine
a beginning slot in the second numerology based on the scheduling
offset threshold being defined in the first numerology or the
second numerology.
[0266] In some examples, the beginning slot determining component
1320 may convert the scheduling offset threshold to a second
scheduling offset threshold in the second numerology, the
scheduling offset threshold being defined in the first
numerology.
[0267] In some examples, the beginning slot determining component
1320 may determine the beginning slot based on the second
scheduling offset threshold.
[0268] In some examples, the beginning slot determining component
1320 may determine the beginning slot relative to the control
channel based on the scheduling offset threshold.
[0269] The data communicating component 1325 may transmit or
receiving a data transmission during the beginning slot based on
the cross-slot grant.
[0270] The multiple cross-slot grant component 1330 may transmit,
via a second control channel of the first slot, a second cross-slot
grant.
[0271] In some examples, the multiple cross-slot grant component
1330 may determine the beginning slot relative to the control
channel based on the scheduling offset threshold and a second
scheduling offset indicated in the cross-slot grant.
[0272] In some examples, the multiple cross-slot grant component
1330 may determine a second beginning slot relative to the second
control channel based on the scheduling offset threshold and a
third scheduling offset indicated in the second cross-slot
grant.
[0273] In some examples, the multiple cross-slot grant component
1330 may determine the beginning slot relative to the control
channel based on the relative timing difference.
[0274] In some examples, the multiple cross-slot grant component
1330 may determine the second beginning slot of the shared channel
relative to the second control channel based on the relative timing
difference.
[0275] In some examples, the multiple cross-slot grant component
1330 may transmit control signaling indicating a change to the
scheduling offset threshold.
[0276] In some examples, the multiple cross-slot grant component
1330 may apply the change to the scheduling offset threshold in a
slot occurring after the beginning slot.
[0277] In some examples, the multiple cross-slot grant component
1330 may map an ending symbol period of the control channel to a
shared channel slot of the shared channel defined in the second
numerology.
[0278] In some examples, the multiple cross-slot grant component
1330 may determine the beginning slot based on the shared channel
slot and the relative timing difference.
[0279] In some cases, the scheduling offset threshold indicates a
number of symbol periods defined in the second numerology.
[0280] In some cases, the scheduling offset threshold is a relative
timing difference.
[0281] FIG. 14 shows a diagram of a system 1400 including a device
1405 that supports cross-slot scheduling for cross numerology in
accordance with aspects of the present disclosure. The device 1405
may be an example of or include the components of device 1105,
device 1205, or a base station 105 as described herein. The device
1405 may include components for bi-directional voice and data
communications including components for transmitting and receiving
communications, including a communications manager 1410, a network
communications manager 1415, a transceiver 1420, an antenna 1425,
memory 1430, a processor 1440, and an inter-station communications
manager 1445. These components may be in electronic communication
via one or more buses (e.g., bus 1450).
[0282] The communications manager 1410 may transmit control
signaling that indicates a scheduling offset threshold
corresponding to a cross-slot grant, transmit, in a first slot, the
cross-slot grant in a control channel that has a first numerology
that is different than a second numerology of a shared channel,
determine a beginning slot in the second numerology based on the
scheduling offset threshold being defined in the first numerology
or the second numerology, and transmit or receiving a data
transmission during the beginning slot based on the cross-slot
grant.
[0283] The network communications manager 1415 may manage
communications with the core network (e.g., via one or more wired
backhaul links). For example, the network communications manager
1415 may manage the transfer of data communications for client
devices, such as one or more UEs 115.
[0284] The transceiver 1420 may communicate bi-directionally, via
one or more antennas, wired, or wireless links as described above.
For example, the transceiver 1420 may represent a wireless
transceiver and may communicate bi-directionally with another
wireless transceiver. The transceiver 1420 may also include a modem
to modulate the packets and provide the modulated packets to the
antennas for transmission, and to demodulate packets received from
the antennas.
[0285] In some cases, the wireless device may include a single
antenna 1425. However, in some cases the device may have more than
one antenna 1425, which may be capable of concurrently transmitting
or receiving multiple wireless transmissions.
[0286] The memory 1430 may include RAM, ROM, or a combination
thereof. The memory 1430 may store computer-readable code 1435
including instructions that, when executed by a processor (e.g.,
the processor 1440) cause the device to perform various functions
described herein. In some cases, the memory 1430 may contain, among
other things, a BIOS which may control basic hardware or software
operation such as the interaction with peripheral components or
devices.
[0287] The processor 1440 may include an intelligent hardware
device, (e.g., a general-purpose processor, a DSP, a CPU, a
microcontroller, an ASIC, an FPGA, a programmable logic device, a
discrete gate or transistor logic component, a discrete hardware
component, or any combination thereof). In some cases, the
processor 1440 may be configured to operate a memory array using a
memory controller. In some cases, a memory controller may be
integrated into processor 1440. The processor 1440 may be
configured to execute computer-readable instructions stored in a
memory (e.g., the memory 1430) to cause the device 1405 to perform
various functions (e.g., functions or tasks supporting cross-slot
scheduling for cross numerology).
[0288] The inter-station communications manager 1445 may manage
communications with other base station 105 and may include a
controller or scheduler for controlling communications with UEs 115
in cooperation with other base stations 105. For example, the
inter-station communications manager 1445 may coordinate scheduling
for transmissions to UEs 115 for various interference mitigation
techniques such as beamforming or joint transmission. In some
examples, the inter-station communications manager 1445 may provide
an X2 interface within an LTE/LTE-A wireless communication network
technology to provide communication between base stations 105.
[0289] The code 1435 may include instructions to implement aspects
of the present disclosure, including instructions to support
wireless communications. The code 1435 may be stored in a
non-transitory computer-readable medium such as system memory or
other type of memory. In some cases, the code 1435 may not be
directly executable by the processor 1440 but may cause a computer
(e.g., when compiled and executed) to perform functions described
herein.
[0290] FIG. 15 shows a flowchart illustrating a method 1500 that
supports cross-slot scheduling for cross numerology in accordance
with aspects of the present disclosure. The operations of method
1500 may be implemented by a UE 115 or its components as described
herein. For example, the operations of method 1500 may be performed
by a communications manager as described with reference to FIGS. 7
through 10. In some examples, a UE may execute a set of
instructions to control the functional elements of the UE to
perform the functions described below. Additionally, or
alternatively, a UE may perform aspects of the functions described
below using special-purpose hardware.
[0291] At 1505, the UE may identify a scheduling offset threshold
corresponding to a cross-slot grant. The operations of 1505 may be
performed according to the methods described herein. In some
examples, aspects of the operations of 1505 may be performed by a
scheduling offset threshold identifying component as described with
reference to FIGS. 7 through 10. Additionally or alternatively,
means for performing 1505 may, but not necessarily, include, for
example, antenna 1025, transceiver 1020, communications manager
1010, memory 1030 (including code 1035), processor 1040 and/or bus
1045.
[0292] At 1510, the UE may monitor a control channel in a first
slot for the cross-slot grant, the control channel having a first
numerology that is different than a second numerology of a shared
channel. The operations of 1510 may be performed according to the
methods described herein. In some examples, aspects of the
operations of 1510 may be performed by a control channel monitoring
component as described with reference to FIGS. 7 through 10.
Additionally or alternatively, means for performing 1510 may, but
not necessarily, include, for example, antenna 1025, transceiver
1020, communications manager 1010, memory 1030 (including code
1035), processor 1040 and/or bus 1045.
[0293] At 1515, the UE may determine a beginning slot defined in
the second numerology based on interpreting the scheduling offset
threshold as being defined in the first numerology or the second
numerology. The operations of 1515 may be performed according to
the methods described herein. In some examples, aspects of the
operations of 1515 may be performed by a beginning slot determining
component as described with reference to FIGS. 7 through 10.
Additionally or alternatively, means for performing 1515 may, but
not necessarily, include, for example, antenna 1025, transceiver
1020, communications manager 1010, memory 1030 (including code
1035), processor 1040 and/or bus 1045.
[0294] At 1520, the UE may operate in a low power state, or
communicating a data transmission, during the beginning slot based
on whether the cross-slot grant is detected. The operations of 1520
may be performed according to the methods described herein. In some
examples, aspects of the operations of 1520 may be performed by a
low power state component as described with reference to FIGS. 7
through 10. Additionally or alternatively, means for performing
1520 may, but not necessarily, include, for example, antenna 1025,
transceiver 1020, communications manager 1010, memory 1030
(including code 1035), processor 1040 and/or bus 1045.
[0295] FIG. 16 shows a flowchart illustrating a method 1600 that
supports cross-slot scheduling for cross numerology in accordance
with aspects of the present disclosure. The operations of method
1600 may be implemented by a UE 115 or its components as described
herein. For example, the operations of method 1600 may be performed
by a communications manager as described with reference to FIGS. 7
through 10. In some examples, a UE may execute a set of
instructions to control the functional elements of the UE to
perform the functions described below. Additionally, or
alternatively, a UE may perform aspects of the functions described
below using special-purpose hardware.
[0296] At 1605, the UE may retrieve a set of different candidate
scheduling offset thresholds from local storage of the UE, the set
of different candidate scheduling offset thresholds being
preconfigured. The operations of 1605 may be performed according to
the methods described herein. In some examples, aspects of the
operations of 1605 may be performed by a scheduling offset
threshold identifying component as described with reference to
FIGS. 7 through 10. Additionally or alternatively, means for
performing 1605 may, but not necessarily, include, for example,
antenna 1025, transceiver 1020, communications manager 1010, memory
1030 (including code 1035), processor 1040 and/or bus 1045.
[0297] At 1610, the UE may receive layer one control signaling
indicating the scheduling offset threshold from the set of
different candidate scheduling offset thresholds. The operations of
1610 may be performed according to the methods described herein. In
some examples, aspects of the operations of 1610 may be performed
by a scheduling offset threshold identifying component as described
with reference to FIGS. 7 through 10. Additionally or
alternatively, means for performing 1610 may, but not necessarily,
include, for example, antenna 1025, transceiver 1020,
communications manager 1010, memory 1030 (including code 1035),
processor 1040 and/or bus 1045.
[0298] At 1615, the UE may identify a scheduling offset threshold
corresponding to a cross-slot grant. The operations of 1615 may be
performed according to the methods described herein. In some
examples, aspects of the operations of 1615 may be performed by a
scheduling offset threshold identifying component as described with
reference to FIGS. 7 through 10. Additionally or alternatively,
means for performing 1615 may, but not necessarily, include, for
example, antenna 1025, transceiver 1020, communications manager
1010, memory 1030 (including code 1035), processor 1040 and/or bus
1045.
[0299] At 1620, the UE may monitor a control channel in a first
slot for the cross-slot grant, the control channel having a first
numerology that is different than a second numerology of a shared
channel. The operations of 1620 may be performed according to the
methods described herein. In some examples, aspects of the
operations of 1620 may be performed by a control channel monitoring
component as described with reference to FIGS. 7 through 10.
Additionally or alternatively, means for performing 1620 may, but
not necessarily, include, for example, antenna 1025, transceiver
1020, communications manager 1010, memory 1030 (including code
1035), processor 1040 and/or bus 1045.
[0300] At 1625, the UE may determine a beginning slot defined in
the second numerology based on interpreting the scheduling offset
threshold as being defined in the first numerology or the second
numerology. The operations of 1625 may be performed according to
the methods described herein. In some examples, aspects of the
operations of 1625 may be performed by a beginning slot determining
component as described with reference to FIGS. 7 through 10.
Additionally or alternatively, means for performing 1625 may, but
not necessarily, include, for example, antenna 1025, transceiver
1020, communications manager 1010, memory 1030 (including code
1035), processor 1040 and/or bus 1045.
[0301] At 1630, the UE may operate in a low power state, or
communicating a data transmission, during the beginning slot based
on whether the cross-slot grant is detected. The operations of 1630
may be performed according to the methods described herein. In some
examples, aspects of the operations of 1630 may be performed by a
low power state component as described with reference to FIGS. 7
through 10. Additionally or alternatively, means for performing
1630 may, but not necessarily, include, for example, antenna 1025,
transceiver 1020, communications manager 1010, memory 1030
(including code 1035), processor 1040 and/or bus 1045.
[0302] FIG. 17 shows a flowchart illustrating a method 1700 that
supports cross-slot scheduling for cross numerology in accordance
with aspects of the present disclosure. The operations of method
1700 may be implemented by a UE 115 or its components as described
herein. For example, the operations of method 1700 may be performed
by a communications manager as described with reference to FIGS. 7
through 10. In some examples, a UE may execute a set of
instructions to control the functional elements of the UE to
perform the functions described below. Additionally, or
alternatively, a UE may perform aspects of the functions described
below using special-purpose hardware.
[0303] At 1705, the UE may identify a scheduling offset threshold
corresponding to a cross-slot grant. The operations of 1705 may be
performed according to the methods described herein. In some
examples, aspects of the operations of 1705 may be performed by a
scheduling offset threshold identifying component as described with
reference to FIGS. 7 through 10. Additionally or alternatively,
means for performing 1705 may, but not necessarily, include, for
example, antenna 1025, transceiver 1020, communications manager
1010, memory 1030 (including code 1035), processor 1040 and/or bus
1045.
[0304] At 1710, the UE may monitor a control channel in a first
slot for the cross-slot grant, the control channel having a first
numerology that is different than a second numerology of a shared
channel. The operations of 1710 may be performed according to the
methods described herein. In some examples, aspects of the
operations of 1710 may be performed by a control channel monitoring
component as described with reference to FIGS. 7 through 10.
Additionally or alternatively, means for performing 1710 may, but
not necessarily, include, for example, antenna 1025, transceiver
1020, communications manager 1010, memory 1030 (including code
1035), processor 1040 and/or bus 1045.
[0305] At 1715, the UE may receive the cross-slot grant in a
downlink bandwidth part having the first numerology, the cross-slot
grant scheduling the data transmission as an uplink transmission on
the shared channel in an active uplink bandwidth part having the
second numerology. The operations of 1715 may be performed
according to the methods described herein. In some examples,
aspects of the operations of 1715 may be performed by a cross-slot
grant receiving component as described with reference to FIGS. 7
through 10. Additionally or alternatively, means for performing
1715 may, but not necessarily, include, for example, antenna 1025,
transceiver 1020, communications manager 1010, memory 1030
(including code 1035), processor 1040 and/or bus 1045.
[0306] At 1720, the UE may determine a beginning slot defined in
the second numerology based on interpreting the scheduling offset
threshold as being defined in the first numerology or the second
numerology. The operations of 1720 may be performed according to
the methods described herein. In some examples, aspects of the
operations of 1720 may be performed by a beginning slot determining
component as described with reference to FIGS. 7 through 10.
Additionally or alternatively, means for performing 1720 may, but
not necessarily, include, for example, antenna 1025, transceiver
1020, communications manager 1010, memory 1030 (including code
1035), processor 1040 and/or bus 1045.
[0307] At 1725, the UE may operate in a low power state, or
communicating a data transmission, during the beginning slot based
on whether the cross-slot grant is detected. The operations of 1725
may be performed according to the methods described herein. In some
examples, aspects of the operations of 1725 may be performed by a
low power state component as described with reference to FIGS. 7
through 10. Additionally or alternatively, means for performing
1725 may, but not necessarily, include, for example, antenna 1025,
transceiver 1020, communications manager 1010, memory 1030
(including code 1035), processor 1040 and/or bus 1045.
[0308] FIG. 18 shows a flowchart illustrating a method 1800 that
supports cross-slot scheduling for cross numerology in accordance
with aspects of the present disclosure. The operations of method
1800 may be implemented by a base station 105 or its components as
described herein. For example, the operations of method 1800 may be
performed by a communications manager as described with reference
to FIGS. 11 through 14. In some examples, a base station may
execute a set of instructions to control the functional elements of
the base station to perform the functions described below.
Additionally, or alternatively, a base station may perform aspects
of the functions described below using special-purpose
hardware.
[0309] At 1805, the base station may transmit control signaling
that indicates a scheduling offset threshold corresponding to a
cross-slot grant. The operations of 1805 may be performed according
to the methods described herein. In some examples, aspects of the
operations of 1805 may be performed by a control signaling
component as described with reference to FIGS. 11 through 14.
Additionally or alternatively, means for performing 1805 may, but
not necessarily, include, for example, antenna 1425, transceiver
1420, communications manager 1410, memory 1430 (including code
1435), processor 1440 and/or bus 1450.
[0310] At 1810, the base station may transmit, in a first slot, the
cross-slot grant in a control channel that has a first numerology
that is different than a second numerology of a shared channel. The
operations of 1810 may be performed according to the methods
described herein. In some examples, aspects of the operations of
1810 may be performed by a cross-slot grant transmitting component
as described with reference to FIGS. 11 through 14. Additionally or
alternatively, means for performing 1810 may, but not necessarily,
include, for example, antenna 1425, transceiver 1420,
communications manager 1410, memory 1430 (including code 1435),
processor 1440 and/or bus 1450.
[0311] At 1815, the base station may determine a beginning slot in
the second numerology based on the scheduling offset threshold
being defined in the first numerology or the second numerology. The
operations of 1815 may be performed according to the methods
described herein. In some examples, aspects of the operations of
1815 may be performed by a beginning slot determining component as
described with reference to FIGS. 11 through 14. Additionally or
alternatively, means for performing 1815 may, but not necessarily,
include, for example, antenna 1425, transceiver 1420,
communications manager 1410, memory 1430 (including code 1435),
processor 1440 and/or bus 1450.
[0312] At 1820, the base station may transmit or receiving a data
transmission during the beginning slot based on the cross-slot
grant. The operations of 1820 may be performed according to the
methods described herein. In some examples, aspects of the
operations of 1820 may be performed by a data communicating
component as described with reference to FIGS. 11 through 14.
Additionally or alternatively, means for performing 1820 may, but
not necessarily, include, for example, antenna 1425, transceiver
1420, communications manager 1410, memory 1430 (including code
1435), processor 1440 and/or bus 1450.
[0313] FIG. 19 shows a flowchart illustrating a method 1900 that
supports cross-slot scheduling for cross numerology in accordance
with aspects of the present disclosure. The operations of method
1900 may be implemented by a base station 105 or its components as
described herein. For example, the operations of method 1900 may be
performed by a communications manager as described with reference
to FIGS. 11 through 14. In some examples, a base station may
execute a set of instructions to control the functional elements of
the base station to perform the functions described below.
Additionally, or alternatively, a base station may perform aspects
of the functions described below using special-purpose
hardware.
[0314] At 1905, the base station may transmit layer one control
signaling indicating the scheduling offset threshold from a set of
different candidate scheduling offset thresholds. The operations of
1905 may be performed according to the methods described herein. In
some examples, aspects of the operations of 1905 may be performed
by a control signaling component as described with reference to
FIGS. 11 through 14. Additionally or alternatively, means for
performing 1905 may, but not necessarily, include, for example,
antenna 1425, transceiver 1420, communications manager 1410, memory
1430 (including code 1435), processor 1440 and/or bus 1450.
[0315] At 1910, the base station may transmit control signaling
that indicates a scheduling offset threshold corresponding to a
cross-slot grant. The operations of 1910 may be performed according
to the methods described herein. In some examples, aspects of the
operations of 1910 may be performed by a control signaling
component as described with reference to FIGS. 11 through 14.
Additionally or alternatively, means for performing 1910 may, but
not necessarily, include, for example, antenna 1425, transceiver
1420, communications manager 1410, memory 1430 (including code
1435), processor 1440 and/or bus 1450.
[0316] At 1915, the base station may transmit, in a first slot, the
cross-slot grant in a control channel that has a first numerology
that is different than a second numerology of a shared channel. The
operations of 1915 may be performed according to the methods
described herein. In some examples, aspects of the operations of
1915 may be performed by a cross-slot grant transmitting component
as described with reference to FIGS. 11 through 14. Additionally or
alternatively, means for performing 1915 may, but not necessarily,
include, for example, antenna 1425, transceiver 1420,
communications manager 1410, memory 1430 (including code 1435),
processor 1440 and/or bus 1450.
[0317] At 1920, the base station may determine a beginning slot in
the second numerology based on the scheduling offset threshold
being defined in the first numerology or the second numerology. The
operations of 1920 may be performed according to the methods
described herein. In some examples, aspects of the operations of
1920 may be performed by a beginning slot determining component as
described with reference to FIGS. 11 through 14. Additionally or
alternatively, means for performing 1920 may, but not necessarily,
include, for example, antenna 1425, transceiver 1420,
communications manager 1410, memory 1430 (including code 1435),
processor 1440 and/or bus 1450.
[0318] At 1925, the base station may transmit or receiving a data
transmission during the beginning slot based on the cross-slot
grant. The operations of 1925 may be performed according to the
methods described herein. In some examples, aspects of the
operations of 1925 may be performed by a data communicating
component as described with reference to FIGS. 11 through 14.
Additionally or alternatively, means for performing 1925 may, but
not necessarily, include, for example, antenna 1425, transceiver
1420, communications manager 1410, memory 1430 (including code
1435), processor 1440 and/or bus 1450.
[0319] FIG. 20 shows a flowchart illustrating a method 2000 that
supports cross-slot scheduling for cross numerology in accordance
with aspects of the present disclosure. The operations of method
2000 may be implemented by a UE 115 or its components as described
herein. For example, the operations of method 2000 may be performed
by a communications manager as described with reference to FIGS. 7
through 10. In some examples, a UE may execute a set of
instructions to control the functional elements of the UE to
perform the functions described below. Additionally, or
alternatively, a UE may perform aspects of the functions described
below using special-purpose hardware.
[0320] At 2005, the UE may identify a scheduling offset threshold
corresponding to a cross-slot grant. The operations of 2005 may be
performed according to the methods described herein. In some
examples, aspects of the operations of 2005 may be performed by a
scheduling offset threshold identifying component as described with
reference to FIGS. 7 through 10. Additionally or alternatively,
means for performing 2005 may, but not necessarily, include, for
example, antenna 1025, transceiver 1020, communications manager
1010, memory 1030 (including code 1035), processor 1040 and/or bus
1045.
[0321] At 2010, the UE may monitor a control channel in a first
slot for the cross-slot grant, the control channel having a first
numerology that is different than a second numerology of a shared
channel. The operations of 2010 may be performed according to the
methods described herein. In some examples, aspects of the
operations of 2010 may be performed by a control channel monitoring
component as described with reference to FIGS. 7 through 10.
Additionally or alternatively, means for performing 2010 may, but
not necessarily, include, for example, antenna 1025, transceiver
1020, communications manager 1010, memory 1030 (including code
1035), processor 1040 and/or bus 1045.
[0322] At 2015, the UE may determine a beginning slot defined in
the second numerology based on the scheduling offset. The
operations of 2015 may be performed according to the methods
described herein. In some examples, aspects of the operations of
2015 may be performed by a beginning slot determining component as
described with reference to FIGS. 7 through 10. Additionally or
alternatively, various aspects of determining the beginning slot
defined in the second numerology based on the scheduling offset are
described with reference to FIGS. 15-19. Additionally or
alternatively, means for performing 2015 may, but not necessarily,
include, for example, antenna 1025, transceiver 1020,
communications manager 1010, memory 1030 (including code 1035),
processor 1040 and/or bus 1045.
[0323] At 2020, the UE may operate in a low power state, or
communicating a data transmission, during the beginning slot based
on whether the cross-slot grant is detected. The operations of 2020
may be performed according to the methods described herein. In some
examples, aspects of the operations of 2020 may be performed by a
low power state component as described with reference to FIGS. 7
through 10. Additionally or alternatively, means for performing
2020 may, but not necessarily, include, for example, antenna 1025,
transceiver 1020, communications manager 1010, memory 1030
(including code 1035), processor 1040 and/or bus 1045.
[0324] It should be noted that the methods described herein
describe possible implementations, and that the operations and the
steps may be rearranged or otherwise modified and that other
implementations are possible. Further, aspects from two or more of
the methods may be combined.
[0325] Techniques described herein may be used for various wireless
communications systems such as code division multiple access
(CDMA), time division multiple access (TDMA), frequency division
multiple access (FDMA), orthogonal frequency division multiple
access (OFDMA), single carrier frequency division multiple access
(SC-FDMA), and other systems. A CDMA system may implement a radio
technology such as CDMA2000, Universal Terrestrial Radio Access
(UTRA), etc. CDMA2000 covers IS-2000, IS-95, and IS-856 standards.
IS-2000 Releases may be commonly referred to as CDMA2000 1.times.,
1.times., etc. IS-856 (TIA-856) is commonly referred to as CDMA2000
1.times.EV-DO, High Rate Packet Data (HRPD), etc. UTRA includes
Wideband CDMA (WCDMA) and other variants of CDMA. A TDMA system may
implement a radio technology such as Global System for Mobile
Communications (GSM).
[0326] An OFDMA system may implement a radio technology such as
Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), Institute of
Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE
802.16 (WiMAX), IEEE 802.20, Flash-OFDM, etc. UTRA and E-UTRA are
part of Universal Mobile Telecommunications System (UMTS). LTE,
LTE-A, and LTE-A Pro are releases of UMTS that use E-UTRA. UTRA,
E-UTRA, UMTS, LTE, LTE-A, LTE-A Pro, NR, and GSM are described in
documents from the organization named "3rd Generation Partnership
Project" (3GPP). CDMA2000 and UMB are described in documents from
an organization named "3rd Generation Partnership Project 2"
(3GPP2). The techniques described herein may be used for the
systems and radio technologies mentioned herein as well as other
systems and radio technologies. While aspects of an LTE, LTE-A,
LTE-A Pro, or NR system may be described for purposes of example,
and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of
the description, the techniques described herein are applicable
beyond LTE, LTE-A, LTE-A Pro, or NR applications.
[0327] A macro cell generally covers a relatively large geographic
area (e.g., several kilometers in radius) and may allow
unrestricted access by UEs with service subscriptions with the
network provider. A small cell may be associated with a
lower-powered base station, as compared with a macro cell, and a
small cell may operate in the same or different (e.g., licensed,
unlicensed, etc.) frequency bands as macro cells. Small cells may
include pico cells, femto cells, and micro cells according to
various examples. A pico cell, for example, may cover a small
geographic area and may allow unrestricted access by UEs with
service subscriptions with the network provider. A femto cell may
also cover a small geographic area (e.g., a home) and may provide
restricted access by UEs having an association with the femto cell
(e.g., UEs in a closed subscriber group (CSG), UEs for users in the
home, and the like). An eNB for a macro cell may be referred to as
a macro eNB. An eNB for a small cell may be referred to as a small
cell eNB, a pico eNB, a femto eNB, or a home eNB. An eNB may
support one or multiple (e.g., two, three, four, and the like)
cells, and may also support communications using one or multiple
component carriers.
[0328] The wireless communications systems described herein may
support synchronous or asynchronous operation. For synchronous
operation, the base stations may have similar frame timing, and
transmissions from different base stations may be approximately
aligned in time. For asynchronous operation, the base stations may
have different frame timing, and transmissions from different base
stations may not be aligned in time. The techniques described
herein may be used for either synchronous or asynchronous
operations.
[0329] Information and signals described herein may be represented
using any of a variety of different technologies and techniques.
For example, data, instructions, commands, information, signals,
bits, symbols, and chips that may be referenced throughout the
description may be represented by voltages, currents,
electromagnetic waves, magnetic fields or particles, optical fields
or particles, or any combination thereof.
[0330] The various illustrative blocks and modules described in
connection with the disclosure herein may be implemented or
performed with a general-purpose processor, a DSP, an ASIC, an
FPGA, or other programmable logic device, discrete gate or
transistor logic, discrete hardware components, or any combination
thereof designed to perform the functions described herein. A
general-purpose processor may be a microprocessor, but in the
alternative, the processor may be any conventional processor,
controller, microcontroller, or state machine. A processor may also
be implemented as a combination of computing devices (e.g., a
combination of a DSP and a microprocessor, multiple
microprocessors, one or more microprocessors in conjunction with a
DSP core, or any other such configuration).
[0331] The functions described herein may be implemented in
hardware, software executed by a processor, firmware, or any
combination thereof. If implemented in software executed by a
processor, the functions may be stored on or transmitted over as
one or more instructions or code on a computer-readable medium.
Other examples and implementations are within the scope of the
disclosure and appended claims. For example, due to the nature of
software, functions described herein can be implemented using
software executed by a processor, hardware, firmware, hardwiring,
or combinations of any of these. Features implementing functions
may also be physically located at various positions, including
being distributed such that portions of functions are implemented
at different physical locations.
[0332] Computer-readable media includes both non-transitory
computer storage media and communication media including any medium
that facilitates transfer of a computer program from one place to
another. A non-transitory storage medium may be any available
medium that can be accessed by a general purpose or special purpose
computer. By way of example, and not limitation, non-transitory
computer-readable media may include random-access memory (RAM),
read-only memory (ROM), electrically erasable programmable ROM
(EEPROM), flash memory, compact disk (CD) ROM or other optical disk
storage, magnetic disk storage or other magnetic storage devices,
or any other non-transitory medium that can be used to carry or
store desired program code means in the form of instructions or
data structures and that can be accessed by a general-purpose or
special-purpose computer, or a general-purpose or special-purpose
processor. Also, any connection is properly termed a
computer-readable medium. For example, if the software is
transmitted from a website, server, or other remote source using a
coaxial cable, fiber optic cable, twisted pair, digital subscriber
line (DSL), or wireless technologies such as infrared, radio, and
microwave, then the coaxial cable, fiber optic cable, twisted pair,
DSL, or wireless technologies such as infrared, radio, and
microwave are included in the definition of medium. Disk and disc,
as used herein, include CD, laser disc, optical disc, digital
versatile disc (DVD), floppy disk and Blu-ray disc where disks
usually reproduce data magnetically, while discs reproduce data
optically with lasers. Combinations of the above are also included
within the scope of computer-readable media.
[0333] As used herein, including in the claims, "or" as used in a
list of items (e.g., a list of items prefaced by a phrase such as
"at least one of" or "one or more of") indicates an inclusive list
such that, for example, a list of at least one of A, B, or C means
A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Also,
as used herein, the phrase "based on" shall not be construed as a
reference to a closed set of conditions. For example, an exemplary
step that is described as "based on condition A" may be based on
both a condition A and a condition B without departing from the
scope of the present disclosure. In other words, as used herein,
the phrase "based on" shall be construed in the same manner as the
phrase "based at least in part on."
[0334] In the appended figures, similar components or features may
have the same reference label. Further, various components of the
same type may be distinguished by following the reference label by
a dash and a second label that distinguishes among the similar
components. If just the first reference label is used in the
specification, the description is applicable to any one of the
similar components having the same first reference label
irrespective of the second reference label, or other subsequent
reference label.
[0335] The description set forth herein, in connection with the
appended drawings, describes example configurations and does not
represent all the examples that may be implemented or that are
within the scope of the claims. The term "exemplary" used herein
means "serving as an example, instance, or illustration," and not
"preferred" or "advantageous over other examples." The detailed
description includes specific details for the purpose of providing
an understanding of the described techniques. These techniques,
however, may be practiced without these specific details. In some
instances, well-known structures and devices are shown in block
diagram form in order to avoid obscuring the concepts of the
described examples.
[0336] The description herein is provided to enable a person
skilled in the art to make or use the disclosure. Various
modifications to the disclosure will be readily apparent to those
skilled in the art, and the generic principles defined herein may
be applied to other variations without departing from the scope of
the disclosure. Thus, the disclosure is not limited to the examples
and designs described herein, but is to be accorded the broadest
scope consistent with the principles and novel features disclosed
herein.
* * * * *