U.S. patent application number 17/140877 was filed with the patent office on 2022-07-07 for dynamic timing advance adjustment schemes.
The applicant listed for this patent is QUALCOMM Incorporated. Invention is credited to Tianyang Bai, Junyi Li, Tao Luo, Yan Zhou.
Application Number | 20220217669 17/140877 |
Document ID | / |
Family ID | |
Filed Date | 2022-07-07 |
United States Patent
Application |
20220217669 |
Kind Code |
A1 |
Bai; Tianyang ; et
al. |
July 7, 2022 |
DYNAMIC TIMING ADVANCE ADJUSTMENT SCHEMES
Abstract
Methods, systems, and devices for wireless communications are
described. A user equipment (UE) may transmit a capability or
mobility mode indication to a base station. The base station may
select a timing advance (TA) adjustment scheme based on the
information included in the indication. The base station may select
a TA adjustment scheme in which the UE autonomously adjusts a TA
value; the UE adjusts the TA value after receiving a command from
the base station; or the UE transmits a message to the base station
including a proposed TA adjustment, and the UE adjusts the TA value
after receiving an approval message from the base station. The base
station may transmit a TA adjustment scheme configuration to the UE
including an indication of the selected TA adjustment scheme. The
UE may adjust a TA value for an uplink transmission based on
applying the TA adjustment scheme.
Inventors: |
Bai; Tianyang; (Somerville,
NJ) ; Zhou; Yan; (San Diego, CA) ; Luo;
Tao; (San Diego, CA) ; Li; Junyi; (Franklin
Park, NJ) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
QUALCOMM Incorporated |
San Diego |
CA |
US |
|
|
Appl. No.: |
17/140877 |
Filed: |
January 4, 2021 |
International
Class: |
H04W 56/00 20060101
H04W056/00; H04W 8/24 20060101 H04W008/24; H04W 8/08 20060101
H04W008/08; H04W 80/02 20060101 H04W080/02 |
Claims
1. A method for wireless communications at a user equipment (UE),
comprising: transmitting a first message comprising information
associated with a timing advance adjustment procedure at the UE,
wherein the information comprises at least one of a UE capability
or mobility mode of the UE; receiving a second message configuring
the UE with a timing advance adjustment scheme that is from a
plurality of timing advance adjustment schemes, the timing advance
adjustment scheme being based at least in part on the first
message; and transmitting an uplink message based at least in part
on performing the timing advance adjustment procedure, wherein the
timing advance adjustment procedure comprises applying a timing
advance adjustment value to the uplink message in accordance with
the timing advance adjustment scheme.
2. The method of claim 1, wherein the timing advance adjustment
scheme comprises: determining the timing advance adjustment value
based at least in part on the information associated with the
timing advance adjustment procedure; and performing the timing
advance adjustment procedure using the determined timing advance
adjustment value.
3. The method of claim 2, wherein the timing advance adjustment
scheme further comprises: transmitting, to a base station, an
indication of the determined timing advance adjustment value.
4. The method of claim 3, wherein the indication is transmitted
based at least in part on performing the timing advance adjustment
procedure.
5. The method of claim 3, further comprising: receiving, from the
base station, a third message configuring the indicated timing
advance adjustment value, wherein the timing advance adjustment
procedure is performed based at least in part on receiving the
third message configuring the indicated timing advance adjustment
value.
6. The method of claim 5, further comprising: determining a second
timing advance adjustment value based at least in part on the
information associated with the timing advance adjustment
procedure; and refraining from applying the second timing advance
adjustment value or transmitting an indication of the second timing
advance adjustment value for a duration based at least in part on
receiving the third message configuring the indicated timing
advance adjustment value.
7. The method of claim 3, further comprising: receiving, from the
base station, a configuration of a second timing advance adjustment
value, wherein the indication of the second timing advance
adjustment value is received after transmitting the indication of
the timing advance adjustment value; and performing a second timing
advance adjustment procedure using the second timing advance
adjustment value based at least in part on the configuration of the
second timing advance adjustment value.
8. The method of claim 7, further comprising: determining that the
configuration of the second timing advance adjustment value is
received within a threshold time period after transmitting the
indication of the timing advance adjustment value, wherein
performing the second timing advance adjustment procedure is based
at least in part on the determination that the configuration of the
second timing advance adjustment value is received within the
threshold time period.
9. The method of claim 3, wherein transmitting the indication of
the determined timing advance adjustment value comprises:
transmitting the indication of the determined timing advance
adjustment value using uplink control information over an uplink
shared channel, uplink control information over an uplink control
channel, a medium access control (MAC) control element, or any
combination thereof.
10. The method of claim 3, further comprising: monitoring, for a
duration after transmitting the indication of the determined timing
advance adjustment value, for a feedback message from the base
station; receiving, from the base station and during the duration,
the feedback message comprising feedback information, wherein the
timing advance adjustment procedure is performed based at least in
part on receiving the feedback message.
11. The method of claim 10, wherein the feedback message indicates
a second timing advance adjustment value, the method further
comprising: performing a second timing advance adjustment procedure
using the second timing advance adjustment value.
12. The method of claim 3, further comprising: monitoring, for a
duration after transmitting the indication of the determined timing
advance adjustment value, for a feedback message from the base
station; transmitting, to the base station, an additional
indication of the determined timing advance adjustment value based
at least in part on failing to receive the feedback message during
the duration.
13. The method of claim 3, wherein: the determined timing advance
adjustment value is indicated per beam, per antenna panel, per
transmission reception point, per beam group, per timing advance
group, or any combination thereof; and the timing advance
adjustment scheme is configured for one or more transmit beams
corresponding to the beam, the antenna panel, the transmission
reception point, the beam group, the timing advance group, or any
combination thereof.
14. The method of claim 2, wherein determining the timing advance
adjustment value comprises: measuring one or more parameters
associated with a plurality of synchronization signal blocks,
wherein the one or more parameters comprise a reference signal
received power, a location of the UE, or both; and calculating the
timing advance adjustment value based at least in part on the one
or more parameters.
15. The method of claim 2, further comprising: receiving, from a
base station, a downlink control channel order for performing a
random access procedure; and refraining from performing the timing
advance adjustment procedure using the determined timing advance
adjustment value based at least in part on the downlink control
channel order being received within a threshold time period of
determining the timing advance adjustment value.
16. The method of claim 1, wherein the timing advance adjustment
scheme comprises: receiving, from a base station, an indication of
the timing advance adjustment value for the timing advance
adjustment procedure based at least in part on the information
associated with the timing advance adjustment procedure; and
performing the timing advance adjustment procedure using the
indicated timing advance adjustment value.
17. The method of claim 1, wherein the first message comprises a
capability for the UE to support one or more timing advance
adjustment schemes of the plurality of timing advance adjustment
schemes, one or more environmental conditions associated with the
UE, or both.
18. A method for wireless communications at a base station,
comprising: receiving, from a user equipment (UE), a first message
comprising information associated with a timing advance adjustment
procedure at the UE, wherein the information comprises at least one
of a UE capability or mobility mode of the UE; selecting a timing
advance adjustment scheme from a plurality of timing advance
adjustment schemes, wherein the timing advance adjustment scheme is
selected based at least in part on the first message; transmitting
a second message configuring the UE with the selected timing
advance adjustment scheme; and receiving an uplink message from the
UE in accordance with the selected timing advance adjustment
scheme.
19. The method of claim 18, wherein the timing advance adjustment
scheme comprises: receiving, from the UE, an indication of a timing
advance adjustment value determined at the UE.
20. The method of claim 19, wherein the indication is received
based at least in part on the UE performing the timing advance
adjustment procedure.
21. The method of claim 19, further comprising: transmitting, to
the UE, a third message configuring the indicated timing advance
adjustment value.
22. The method of claim 19, further comprising: transmitting, to
the UE, a configuration of a second timing advance adjustment
value, wherein the indication of the second timing advance
adjustment value is transmitted before receiving the indication of
the timing advance adjustment value.
23. The method of claim 19, further comprising: transmitting, to
the UE and during a duration after receiving the indication of the
determined timing advance adjustment value, a feedback message
comprising feedback information.
24. The method of claim 23, wherein the feedback message indicates
a second timing advance adjustment value.
25. The method of claim 19, further comprising: receiving, from the
UE, an additional indication of the determined timing advance
adjustment value.
26. The method of claim 19, wherein: the determined timing advance
adjustment value is indicated per beam, per antenna panel, per
transmission reception point, per beam group, per timing advance
group, or any combination thereof; and the timing advance
adjustment scheme is configured for one or more transmit beams
corresponding to the beam, the antenna panel, the transmission
reception point, the beam group, the timing advance group, or any
combination thereof.
27. The method of claim 18, further comprising: transmitting, to
the UE, a downlink control channel order for performing a random
access procedure.
28. The method of claim 18, wherein the timing advance adjustment
scheme comprises: transmitting, to the UE, an indication of a
timing advance adjustment value for the timing advance adjustment
procedure based at least in part on the information associated with
the timing advance adjustment procedure.
29. An apparatus for wireless communications at 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: transmit a first message
comprising information associated with a timing advance adjustment
procedure at the UE, wherein the information comprises at least one
of a UE capability or mobility mode of the UE; receive a second
message configuring the UE with a timing advance adjustment scheme
that is from a plurality of timing advance adjustment schemes, the
timing advance adjustment scheme being based at least in part on
the first message; and transmit an uplink message based at least in
part on performing the timing advance adjustment procedure, wherein
the timing advance adjustment procedure comprises applying a timing
advance adjustment value to the uplink message in accordance with
the timing advance adjustment scheme.
30. An apparatus for wireless communications at 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: receive, from a user equipment (UE), a
first message comprising information associated with a timing
advance adjustment procedure at the UE, wherein the information
comprises at least one of a UE capability or mobility mode of the
UE; select a timing advance adjustment scheme from a plurality of
timing advance adjustment schemes, wherein the timing advance
adjustment scheme is selected based at least in part on the first
message; transmit a second message configuring the UE with the
selected timing advance adjustment scheme; and receive an uplink
message from the UE in accordance with the selected timing advance
adjustment scheme.
Description
FIELD OF TECHNOLOGY
[0001] The following relates to wireless communications, including
dynamic timing advance (TA) adjustment schemes.
BACKGROUND
[0002] 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 one or more base stations or one or more network access
nodes, each simultaneously supporting communication for multiple
communication devices, which may be otherwise known as user
equipment (UE).
SUMMARY
[0003] The described techniques relate to improved methods,
systems, devices, and apparatuses that support dynamic timing
advance adjustment schemes. Generally, the described techniques
provide for a base station to dynamically configure a user
equipment (UE) to use various timing advance (TA) adjustment
schemes based on a capability or mobility mode at the UE. For
example, the UE may transmit a capability or mobility mode
indication to the base station, and the base station may select a
TA adjustment scheme based on the information included in the
indication. In some examples, the base station may select a TA
adjustment scheme in which the UE autonomously adjusts a TA value.
In some cases, the base station may select a TA adjustment scheme
in which the UE adjusts the TA value after receiving a command from
the base station. In some examples, the base station may select a
TA adjustment scheme in which the UE may transmit a message to the
base station including a proposed TA adjustment (e.g., a TA
adjustment value), and the UE may adjust the TA value after
receiving a message from the base station that approves the
proposed TA adjustment. The base station may transmit a TA
adjustment scheme configuration to the UE, which may include an
indication of the selected TA adjustment scheme. In some examples,
the UE may adjust a TA value for an uplink transmission based on
applying the TA adjustment scheme.
[0004] A method for wireless communications at a UE is described.
The method may include transmitting a first message including
information associated with a TA adjustment procedure at the UE,
where the information includes at least one of a UE capability or
mobility mode of the UE, receiving a second message configuring the
UE with a TA adjustment scheme that is from a set of multiple TA
adjustment schemes, the TA adjustment scheme being based on the
first message, and transmitting an uplink message based on
performing the TA adjustment procedure, where the TA adjustment
procedure includes applying a TA adjustment value to the uplink
message in accordance with the TA adjustment scheme.
[0005] An apparatus for wireless communications at a UE is
described. The apparatus may include a processor, memory in
electronic communication with the processor, and instructions
stored in the memory. The instructions may be executable by the
processor to cause the apparatus to transmit a first message
including information associated with a TA adjustment procedure at
the UE, where the information includes at least one of a UE
capability or mobility mode of the UE, receive a second message
configuring the UE with a TA adjustment scheme that is from a set
of multiple TA adjustment schemes, the TA adjustment scheme being
based on the first message, and transmit an uplink message based on
performing the TA adjustment procedure, where the TA adjustment
procedure includes applying a TA adjustment value to the uplink
message in accordance with the TA adjustment scheme.
[0006] Another apparatus for wireless communications at a UE is
described. The apparatus may include means for transmitting a first
message including information associated with a TA adjustment
procedure at the UE, where the information includes at least one of
a UE capability or mobility mode of the UE, means for receiving a
second message configuring the UE with a TA adjustment scheme that
is from a set of multiple TA adjustment schemes, the TA adjustment
scheme being based on the first message, and means for transmitting
an uplink message based on performing the TA adjustment procedure,
where the TA adjustment procedure includes applying a TA adjustment
value to the uplink message in accordance with the TA adjustment
scheme.
[0007] A non-transitory computer-readable medium storing code for
wireless communications at a UE is described. The code may include
instructions executable by a processor to transmit a first message
including information associated with a TA adjustment procedure at
the UE, where the information includes at least one of a UE
capability or mobility mode of the UE, receive a second message
configuring the UE with a TA adjustment scheme that is from a set
of multiple TA adjustment schemes, the TA adjustment scheme being
based on the first message, and transmit an uplink message based on
performing the TA adjustment procedure, where the TA adjustment
procedure includes applying a TA adjustment value to the uplink
message in accordance with the TA adjustment scheme.
[0008] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the TA
adjustment scheme may include operations, features, means, or
instructions for determining the TA adjustment value based on the
information associated with the TA adjustment procedure and
performing the TA adjustment procedure using the determined TA
adjustment value.
[0009] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the TA
adjustment scheme may include operations, features, means, or
instructions for transmitting, to a base station, an indication of
the determined TA adjustment value.
[0010] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the
indication may be transmitted based on performing the TA adjustment
procedure.
[0011] Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for receiving, from
the base station, a third message configuring the indicated TA
adjustment value, where the TA adjustment procedure may be
performed based on receiving the third message configuring the
indicated TA adjustment value.
[0012] Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for determining a
second TA adjustment value based on the information associated with
the TA adjustment procedure and refraining from applying the second
TA adjustment value or transmitting an indication of the second TA
adjustment value for a duration based on receiving the third
message configuring the indicated TA adjustment value.
[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, from
the base station, a configuration of a second TA adjustment value,
where the indication of the second TA adjustment value may be
received after transmitting the indication of the TA adjustment
value and performing a second TA adjustment procedure using the
second TA adjustment value based on the configuration of the second
TA adjustment value.
[0014] Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for determining that
the configuration of the second TA adjustment value may be received
within a threshold time period after transmitting the indication of
the TA adjustment value, where performing the second TA adjustment
procedure may be based on the determination that the configuration
of the second TA adjustment value may be received within the
threshold time period.
[0015] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein,
transmitting the indication of the determined TA adjustment value
may include operations, features, means, or instructions for
transmitting the indication of the determined TA adjustment value
using uplink control information over an uplink shared channel,
uplink control information over an uplink control channel, a medium
access control (MAC)-control element (CE), or any combination
thereof.
[0016] Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for monitoring, for a
duration after transmitting the indication of the determined TA
adjustment value, for a feedback message from the base station and
receiving, from the base station and during the duration, the
feedback message including feedback information, where the TA
adjustment procedure may be performed based on receiving the
feedback message.
[0017] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the
feedback message indicates a second TA adjustment value and the
method, apparatuses, and non-transitory computer-readable medium
may include further operations, features, means, or instructions
for performing a second TA adjustment procedure using the second TA
adjustment value.
[0018] Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for monitoring, for a
duration after transmitting the indication of the determined TA
adjustment value, for a feedback message from the base station and
transmitting, to the base station, an additional indication of the
determined TA adjustment value based on failing to receive the
feedback message during the duration.
[0019] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the
determined TA adjustment value may be indicated per beam, per
antenna panel, per transmission reception point, per beam group,
per TA group, or any combination thereof and the TA adjustment
scheme may be configured for one or more transmit beams
corresponding to the beam, the antenna panel, the transmission
reception point, the beam group, the TA group, or any combination
thereof.
[0020] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein,
determining the TA adjustment value may include operations,
features, means, or instructions for measuring one or more
parameters associated with a set of multiple synchronization signal
blocks, where the one or more parameters include a reference signal
received power (RSRP), a location of the UE, or both and
calculating the TA adjustment value based on the one or more
parameters.
[0021] Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for receiving, from a
base station, a downlink control channel order for performing a
random access procedure and refraining from performing the TA
adjustment procedure using the determined TA adjustment value based
on the downlink control channel order being received within a
threshold time period of determining the TA adjustment value.
[0022] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the TA
adjustment scheme may include operations, features, means, or
instructions for receiving, from a base station, an indication of
the TA adjustment value for the TA adjustment procedure based on
the information associated with the TA adjustment procedure and
performing the TA adjustment procedure using the indicated TA
adjustment value.
[0023] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the first
message includes a capability for the UE to support one or more TA
adjustment schemes of the set of multiple TA adjustment schemes,
one or more environmental conditions associated with the UE, or
both.
[0024] A method for wireless communications at a base station is
described. The method may include receiving, from a UE, a first
message including information associated with a TA adjustment
procedure at the UE, where the information includes at least one of
a UE capability or mobility mode of the UE, selecting a TA
adjustment scheme from a set of multiple TA adjustment schemes,
where the TA adjustment scheme is selected based on the first
message, transmitting a second message configuring the UE with the
selected TA adjustment scheme, and receiving an uplink message from
the UE in accordance with the selected TA adjustment scheme.
[0025] An apparatus for wireless communications at a base station
is described. The apparatus may include a processor, memory in
electronic communication with the processor, and instructions
stored in the memory. The instructions may be executable by the
processor to cause the apparatus to receive, from a UE, a first
message including information associated with a TA adjustment
procedure at the UE, where the information includes at least one of
a UE capability or mobility mode of the UE, select a TA adjustment
scheme from a set of multiple TA adjustment schemes, where the TA
adjustment scheme is selected based on the first message, transmit
a second message configuring the UE with the selected TA adjustment
scheme, and receive an uplink message from the UE in accordance
with the selected TA adjustment scheme.
[0026] Another apparatus for wireless communications at a base
station is described. The apparatus may include means for
receiving, from a UE, a first message including information
associated with a TA adjustment procedure at the UE, where the
information includes at least one of a UE capability or mobility
mode of the UE, means for selecting a TA adjustment scheme from a
set of multiple TA adjustment schemes, where the TA adjustment
scheme is selected based on the first message, means for
transmitting a second message configuring the UE with the selected
TA adjustment scheme, and means for receiving an uplink message
from the UE in accordance with the selected TA adjustment
scheme.
[0027] A non-transitory computer-readable medium storing code for
wireless communications at a base station is described. The code
may include instructions executable by a processor to receive, from
a UE, a first message including information associated with a TA
adjustment procedure at the UE, where the information includes at
least one of a UE capability or mobility mode of the UE, select a
TA adjustment scheme from a set of multiple TA adjustment schemes,
where the TA adjustment scheme is selected based on the first
message, transmit a second message configuring the UE with the
selected TA adjustment scheme, and receive an uplink message from
the UE in accordance with the selected TA adjustment scheme.
[0028] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the TA
adjustment scheme may include operations, features, means, or
instructions for receiving, from the UE, an indication of a TA
adjustment value determined at the UE.
[0029] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the
indication may be received based on the UE performing the TA
adjustment procedure.
[0030] Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for transmitting, to
the UE, a third message configuring the indicated TA adjustment
value.
[0031] Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for transmitting, to
the UE, a configuration of a second TA adjustment value, where the
indication of the second TA adjustment value may be transmitted
before receiving the indication of the TA adjustment value.
[0032] Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for transmitting, to
the UE and during a duration after receiving the indication of the
determined TA adjustment value, a feedback message including
feedback information.
[0033] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the
feedback message indicates a second TA adjustment value.
[0034] Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for receiving, from
the UE, an additional indication of the determined TA adjustment
value.
[0035] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the
determined TA adjustment value may be indicated per beam, per
antenna panel, per transmission reception point, per beam group,
per TA group, or any combination thereof and the TA adjustment
scheme may be configured for one or more transmit beams
corresponding to the beam, the antenna panel, the transmission
reception point, the beam group, the TA group, or any combination
thereof.
[0036] Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for transmitting, to
the UE, a downlink control channel order for performing a random
access procedure.
[0037] In some examples of the method, apparatuses, and
non-transitory computer-readable medium described herein, the TA
adjustment scheme may include operations, features, means, or
instructions for transmitting, to the UE, an indication of a TA
adjustment value for the TA adjustment procedure based on the
information associated with the TA adjustment procedure.
BRIEF DESCRIPTION OF THE DRAWINGS
[0038] FIGS. 1 and 2 illustrate examples of wireless communications
systems that support dynamic timing advance (TA) adjustment schemes
in accordance with aspects of the present disclosure.
[0039] FIGS. 3 through 5 illustrate examples of process flows in a
system that supports dynamic TA adjustment schemes in accordance
with aspects of the present disclosure.
[0040] FIGS. 6 and 7 show block diagrams of devices that support
dynamic TA adjustment schemes in accordance with aspects of the
present disclosure.
[0041] FIG. 8 shows a block diagram of a communications manager
that supports dynamic TA adjustment schemes in accordance with
aspects of the present disclosure.
[0042] FIG. 9 shows a diagram of a system including a device that
supports dynamic TA adjustment schemes in accordance with aspects
of the present disclosure.
[0043] FIGS. 10 and 11 show block diagrams of devices that support
dynamic TA adjustment schemes in accordance with aspects of the
present disclosure.
[0044] FIG. 12 shows a block diagram of a communications manager
that supports dynamic TA adjustment schemes in accordance with
aspects of the present disclosure.
[0045] FIG. 13 shows a diagram of a system including a device that
supports dynamic TA adjustment schemes in accordance with aspects
of the present disclosure.
[0046] FIGS. 14 through 17 show flowcharts illustrating methods
that support dynamic TA adjustment schemes in accordance with
aspects of the present disclosure.
DETAILED DESCRIPTION
[0047] In some wireless communications systems, a base station may
transmit an indication of a timing advance (TA) to a user equipment
(UE), which the UE may use to adjust the timing of subsequent
uplink transmissions. For example, a TA adjustment procedure may
include a UE transmitting a message to a base station and the base
station, in turn, calculating a timing correction based on when the
base station received the message. The base station may then
transmit an indication of the calculated timing correction (e.g.,
the TA adjustment value) to the UE. The UE may apply the TA
adjustment for subsequent transmissions, where the UE may wait for
an amount of time indicated by the TA (e.g., a round-trip time
(RTT)) before transmitting an uplink message. In some cases, the UE
may adjust the TA based on one or more changing conditions.
[0048] The UE may perform reception timing adjustment, which may be
different than a TA adjustment, to correct for errors in a UE
timing clock, to account for any base station changes to a downlink
transmission timing, UE location changes, changes in the
environment surrounding the UE, or the like. In the case of change
of location or environment, the UE may adjust the TA based on the
receive timing adjustment (e.g., when the receive timing difference
is greater than a threshold value). For example, the UE may adjust
the TA based on a base station command, may autonomously adjust the
TA, or may adjust the TA according to some other TA adjustment
scheme. Some wireless communication scenarios may benefit from one
approach over another; however, a implementing a single approach
across the different scenarios may result in inefficiencies in
power adjustment and other issues. Put another way, a static or
semi-static approach to power adjustment configurations may result
in the UE utilizing a power adjustment scheme that may not be
suited to the conditions experienced by the UE.
[0049] As described herein, a UE may adjust a TA according to at
least one TA adjustment scheme dynamically configured by the base
station. In such cases, a UE may transmit information (e.g.,
related to changes in environmental conditions surrounding the UE,
a UE capability for adjusting a TA, a mobility mode of the UE, or a
combination thereof) to a base station, which the base station may
use to select a TA adjustment scheme from a set of TA adjustment
schemes for an uplink transmission from the UE to the base station.
For example, if the UE is in a high speed mobility scenario, the
base station may select a TA adjustment scheme in which the UE
autonomously adjusts the TA. The base station may dynamically
configure the UE to autonomously adjust a TA based on one or more
conditions being met (e.g., such as when a receive timing is
greater than a threshold). In such cases, the UE may inform the
base station of the autonomous TA adjustment (e.g., the current TA
value utilized by the UE). In some cases, the UE may not inform the
base station of the autonomous TA adjustment. In some examples, the
UE may propose a TA adjustment to the base station (e.g., based on
measuring one or more synchronization signal blocks (SSBs), a
configured algorithm, or the like) and may receive, in response, an
approval message from the base station. The UE may then adjust the
TA after receiving the approval. The base station may transmit an
indication of the TA adjustment scheme, so that the UE and the base
station may communicate according to the TA adjustment based on the
scheme. For example, the UE may transmit an uplink message based on
adjusting the TA for a duration. The dynamic configuration of TA
adjustments at the UE may provide greater flexibility and control
to enable efficient timing modifications for communications between
the devices.
[0050] Aspects of the disclosure are initially described in the
context of wireless communications systems. Aspects of the
disclosure are further described in the context of process flows.
Aspects of the disclosure are further illustrated by and described
with reference to apparatus diagrams, system diagrams, and
flowcharts that relate to dynamic TA adjustment schemes.
[0051] FIG. 1 illustrates an example of a wireless communications
system 100 that supports dynamic TA adjustment schemes in
accordance with aspects of the present disclosure. The wireless
communications system 100 may include one or more base stations
105, one or more 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 examples, the
wireless communications system 100 may support enhanced broadband
communications, ultra-reliable (e.g., mission critical)
communications, low latency communications, communications with
low-cost and low-complexity devices, or any combination
thereof.
[0052] The base stations 105 may be dispersed throughout a
geographic area to form the wireless communications system 100 and
may be devices in different forms or having different capabilities.
The base stations 105 and the UEs 115 may wirelessly communicate
via one or more communication links 125. Each base station 105 may
provide a coverage area 110 over which the UEs 115 and the base
station 105 may establish one or more communication links 125. The
coverage area 110 may be an example of a geographic area over which
a base station 105 and a UE 115 may support the communication of
signals according to one or more radio access technologies.
[0053] The UEs 115 may be dispersed throughout a coverage area 110
of the wireless communications system 100, and each UE 115 may be
stationary, or mobile, or both at different times. The UEs 115 may
be devices in different forms or having different capabilities.
Some example UEs 115 are illustrated in FIG. 1. The UEs 115
described herein may be able to communicate with various types of
devices, such as other UEs 115, the base stations 105, or network
equipment (e.g., core network nodes, relay devices, integrated
access and backhaul (IAB) nodes, or other network equipment), as
shown in FIG. 1.
[0054] The base stations 105 may communicate with the core network
130, or with one another, or both. For example, the base stations
105 may interface with the core network 130 through one or more
backhaul links 120 (e.g., via an S1, N2, N3, or other interface).
The base stations 105 may communicate with one another over the
backhaul links 120 (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), or both. In some examples, the
backhaul links 120 may be or include one or more wireless
links.
[0055] One or more of the base stations 105 described herein may
include or may be referred to by a person having ordinary skill 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 a giga-NodeB (either of which may be
referred to as a gNB), a Home NodeB, a Home eNodeB, or other
suitable terminology.
[0056] A UE 115 may include or may 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, among other examples. A UE 115 may also include or may
be referred to as 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 include or be referred to as a wireless local loop (WLL)
station, an Internet of Things (IoT) device, an Internet of
Everything (IoE) device, or a machine type communications (MTC)
device, among other examples, which may be implemented in various
objects such as appliances, or vehicles, meters, among other
examples.
[0057] The UEs 115 described herein may be able to communicate with
various types of devices, such as other UEs 115 that may sometimes
act as relays as well as the base stations 105 and the network
equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or
relay base stations, among other examples, as shown in FIG. 1.
[0058] The UEs 115 and the base stations 105 may wirelessly
communicate with one another via one or more communication links
125 over one or more carriers. The term "carrier" may refer to a
set of radio frequency spectrum resources having a defined physical
layer structure for supporting the communication links 125. For
example, a carrier used for a communication link 125 may include a
portion of a radio frequency spectrum band (e.g., a bandwidth part
(BWP)) that is operated according to one or more physical layer
channels for a given radio access technology (e.g., LTE, LTE-A,
LTE-A Pro, NR). Each physical layer channel may carry acquisition
signaling (e.g., synchronization signals, system information),
control signaling that coordinates operation for the carrier, user
data, or other signaling. The wireless communications system 100
may support communication with a UE 115 using 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 frequency
division duplexing (FDD) and time division duplexing (TDD)
component carriers.
[0059] 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. A
carrier may be associated with a 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 the UEs 115. A carrier may be operated in a standalone mode
where initial acquisition and connection may be conducted by the
UEs 115 via the carrier, or the carrier may be operated in a
non-standalone mode where a connection is anchored using a
different carrier (e.g., of the same or a different radio access
technology).
[0060] The communication links 125 shown in the 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. Carriers may carry downlink or uplink
communications (e.g., in an FDD mode) or may be configured to carry
downlink and uplink communications (e.g., in a TDD mode).
[0061] 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 determined bandwidths for
carriers of a particular radio access technology (e.g., 1.4, 3, 5,
10, 15, 20, 40, or 80 megahertz (MHz)). Devices of the wireless
communications system 100 (e.g., the base stations 105, the UEs
115, or both) may have hardware configurations that support
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 or UEs 115 that support
simultaneous communications via carriers associated with multiple
carrier bandwidths. In some examples, each served UE 115 may be
configured for operating over portions (e.g., a sub-band, a BWP) or
all of a carrier bandwidth.
[0062] Signal waveforms transmitted over a carrier may be made up
of multiple subcarriers (e.g., using multi-carrier modulation (MCM)
techniques such as orthogonal frequency division multiplexing
(OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In
a system employing MCM techniques, a resource element may include
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, the coding rate of the modulation scheme, or
both). 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. 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 or
beams), and the use of multiple spatial layers may further increase
the data rate or data integrity for communications with a UE
115.
[0063] One or more numerologies for a carrier may be supported,
where a numerology may include a subcarrier spacing (.DELTA.f) and
a cyclic prefix. A carrier may be divided into one or more BWPs
having the same or different numerologies. In some examples, a UE
115 may be configured with multiple BWPs. In some examples, a
single BWP for a carrier may be active at a given time and
communications for the UE 115 may be restricted to one or more
active BWPs.
[0064] The time intervals for the base stations 105 or the UEs 115
may be expressed in multiples of a basic time unit which may, for
example, refer to a sampling period of
T.sub.s=1/(.DELTA.f.sub.maxN.sub.f) seconds, where .DELTA.f.sub.max
may represent the maximum supported subcarrier spacing, and N.sub.f
may represent the maximum supported discrete Fourier transform
(DFT) size. Time intervals of a communications resource may be
organized according to radio frames each having a specified
duration (e.g., 10 milliseconds (ms)). Each radio frame may be
identified by a system frame number (SFN) (e.g., ranging from 0 to
1023).
[0065] Each frame may include multiple consecutively numbered
subframes or slots, and each subframe or slot may have the same
duration. In some examples, a frame may be divided (e.g., in the
time domain) into subframes, and each subframe may be further
divided into a number of slots. Alternatively, each frame may
include a variable number of slots, and the number of slots may
depend on subcarrier spacing. Each slot may include a number of
symbol periods (e.g., depending on the length of the cyclic prefix
prepended to each symbol period). In some wireless communications
systems 100, a slot may further be divided into multiple mini-slots
containing one or more symbols. Excluding the cyclic prefix, each
symbol period may contain one or more (e.g., N.sub.f) sampling
periods. The duration of a symbol period may depend on the
subcarrier spacing or frequency band of operation.
[0066] A subframe, a slot, a mini-slot, or a symbol may be the
smallest scheduling unit (e.g., in the time domain) of the wireless
communications system 100 and may be referred to as a transmission
time interval (TTI). In some examples, the TTI duration (e.g., the
number of symbol periods in a TTI) may be variable. Additionally or
alternatively, the smallest scheduling unit of the wireless
communications system 100 may be dynamically selected (e.g., in
bursts of shortened TTIs (sTTIs)).
[0067] 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 one or more of time division multiplexing (TDM) techniques,
frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM
techniques. A control region (e.g., a control resource set
(CORESET)) for a physical control channel may be defined by a
number of symbol periods and may extend across the system bandwidth
or a subset of the system bandwidth of the carrier. One or more
control regions (e.g., CORESETs) may be configured for a set of the
UEs 115. For example, one or more of the UEs 115 may monitor or
search control regions for control information according to one or
more search space sets, and each search space set may include one
or multiple control channel candidates in one or more aggregation
levels arranged in a cascaded manner. An aggregation level for a
control channel candidate may refer to a number of control channel
resources (e.g., control channel elements (CCEs)) associated with
encoded information for a control information format having a given
payload size. Search space sets may include common search space
sets configured for sending control information to multiple UEs 115
and UE-specific search space sets for sending control information
to a specific UE 115.
[0068] Each base station 105 may provide communication coverage via
one or more cells, for example a macro cell, a small cell, a hot
spot, or other types of cells, or any combination thereof. The term
"cell" may refer 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), or others). In some examples, a cell may also
refer to a geographic coverage area 110 or a portion of a
geographic coverage area 110 (e.g., a sector) over which the
logical communication entity operates. Such cells may range from
smaller areas (e.g., a structure, a subset of structure) to larger
areas depending on various factors such as the capabilities of the
base station 105. For example, a cell may be or include a building,
a subset of a building, or exterior spaces between or overlapping
with geographic coverage areas 110, among other examples.
[0069] A macro cell generally covers a relatively large geographic
area (e.g., several kilometers in radius) and may allow
unrestricted access by the UEs 115 with service subscriptions with
the network provider supporting the macro cell. A small cell may be
associated with a lower-powered base station 105, as compared with
a macro cell, and a small cell may operate in the same or different
(e.g., licensed, unlicensed) frequency bands as macro cells. Small
cells may provide unrestricted access to the UEs 115 with service
subscriptions with the network provider or may provide restricted
access to the UEs 115 having an association with the small cell
(e.g., the UEs 115 in a closed subscriber group (CSG), the UEs 115
associated with users in a home or office). A base station 105 may
support one or multiple cells and may also support communications
over the one or more cells using one or multiple component
carriers.
[0070] In some examples, a carrier may support multiple cells, and
different cells may be configured according to different protocol
types (e.g., MTC, narrowband IoT (NB-IoT), enhanced mobile
broadband (eMBB)) that may provide access for different types of
devices.
[0071] 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, but
the different geographic coverage areas 110 may be supported by the
same base station 105. In other examples, the overlapping
geographic coverage areas 110 associated with different
technologies may be supported by different base stations 105. The
wireless communications system 100 may include, for example, a
heterogeneous network in which different types of the base stations
105 provide coverage for various geographic coverage areas 110
using the same or different radio access technologies.
[0072] The wireless communications system 100 may support
synchronous or asynchronous operation. For synchronous operation,
the base stations 105 may have similar frame timings, and
transmissions from different base stations 105 may be approximately
aligned in time. For asynchronous operation, the base stations 105
may have different frame timings, and transmissions from different
base stations 105 may, in some examples, not be aligned in time.
The techniques described herein may be used for either synchronous
or asynchronous operations.
[0073] 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 such information to a central server or
application program that makes use of the information or presents
the information to humans interacting with the application program.
Some UEs 115 may be designed to collect information or enable
automated behavior of machines or other devices. 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.
[0074] 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 the UEs
115 include entering a power saving deep sleep mode when not
engaging in active communications, operating over a limited
bandwidth (e.g., according to narrowband communications), or a
combination of these techniques. For example, some UEs 115 may be
configured for operation using a narrowband protocol type that is
associated with a defined portion or range (e.g., set of
subcarriers or resource blocks (RBs)) within a carrier, within a
guard-band of a carrier, or outside of a carrier.
[0075] The wireless communications system 100 may be configured to
support ultra-reliable communications or low-latency
communications, or various combinations thereof. For example, the
wireless communications system 100 may be configured to support
ultra-reliable low-latency communications (URLLC) or mission
critical communications. The UEs 115 may be designed to support
ultra-reliable, low-latency, or critical functions (e.g., mission
critical functions). Ultra-reliable communications may include
private communication or group communication and may be supported
by one or more mission critical services such as mission critical
push-to-talk (MCPTT), mission critical video (MCVideo), or mission
critical data (MCData). Support for mission critical functions may
include prioritization of services, and mission critical services
may be used for public safety or general commercial applications.
The terms ultra-reliable, low-latency, mission critical, and
ultra-reliable low-latency may be used interchangeably herein.
[0076] In some examples, a UE 115 may also be able to communicate
directly with other UEs 115 over a device-to-device (D2D)
communication link 135 (e.g., using a peer-to-peer (P2P) or D2D
protocol). One or more 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 examples,
groups of the 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 examples, a base
station 105 facilitates the scheduling of resources for D2D
communications. In other cases, D2D communications are carried out
between the UEs 115 without the involvement of a base station
105.
[0077] In some systems, the D2D communication link 135 may be an
example of a communication channel, such as a sidelink
communication channel, between vehicles (e.g., UEs 115). In some
examples, vehicles may communicate using vehicle-to-everything
(V2X) communications, vehicle-to-vehicle (V2V) communications, or
some combination of these. A vehicle may signal information related
to traffic conditions, signal scheduling, weather, safety,
emergencies, or any other information relevant to a V2X system. In
some examples, vehicles in a V2X system may communicate with
roadside infrastructure, such as roadside units, or with the
network via one or more network nodes (e.g., base stations 105)
using vehicle-to-network (V2N) communications, or with both.
[0078] 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) or 5G core (5GC), which may
include at least one control plane entity that manages access and
mobility (e.g., a mobility management entity (MME), an access and
mobility management function (AMF)) and at least one user plane
entity that routes packets or interconnects to external networks
(e.g., a serving gateway (S-GW), a Packet Data Network (PDN)
gateway (P-GW), or a user plane function (UPF)). The control plane
entity may manage non-access stratum (NAS) functions such as
mobility, authentication, and bearer management for the UEs 115
served by the base stations 105 associated with the core network
130. User IP packets may be transferred through the user plane
entity, which may provide IP address allocation as well as other
functions. The user plane entity may be connected to IP services
150 for one or more network operators. The IP services 150 may
include access to the Internet, Intranet(s), an IP Multimedia
Subsystem (IMS), or a Packet-Switched Streaming Service.
[0079] Some of the network devices, such as a base station 105, may
include subcomponents such as an access network entity 140, which
may be an example of an access node controller (ANC). Each access
network entity 140 may communicate with the UEs 115 through one or
more other access network transmission entities 145, which may be
referred to as radio heads, smart radio heads, or
transmission/reception points (TRPs). Each access network
transmission entity 145 may include one or more antenna panels. In
some configurations, various functions of each access network
entity 140 or base station 105 may be distributed across various
network devices (e.g., radio heads and ANCs) or consolidated into a
single network device (e.g., a base station 105).
[0080] The wireless communications system 100 may operate using one
or more frequency bands, for example, 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 because the wavelengths range from approximately one
decimeter to one meter in length. The UHF waves may be blocked or
redirected by buildings and environmental features, but the waves
may penetrate structures sufficiently for a macro cell to provide
service to the UEs 115 located indoors. The transmission of UHF
waves may be associated with smaller antennas and shorter ranges
(e.g., less than 100 kilometers) 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.
[0081] The 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, or 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, the
wireless communications system 100 may support millimeter wave
(mmW) communications between the UEs 115 and the base stations 105,
and EHF antennas of the respective devices may be smaller and more
closely spaced than UHF antennas. In some examples, this may
facilitate use of antenna arrays within a device. The propagation
of EHF transmissions, however, may be subject to even greater
atmospheric attenuation and shorter range than SHF or UHF
transmissions. The 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.
[0082] The wireless communications system 100 may utilize both
licensed and unlicensed radio frequency spectrum bands. For
example, the 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 industrial, scientific, and medical (ISM) band. When operating
in unlicensed radio frequency spectrum bands, devices such as the
base stations 105 and the UEs 115 may employ carrier sensing for
collision detection and avoidance. In some examples, 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, P2P
transmissions, or D2D transmissions, among other examples.
[0083] A base station 105 or a 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. The antennas of a base station 105
or a UE 115 may be located within one or more antenna arrays or
antenna panels, 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 examples, 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. Additionally or
alternatively, an antenna panel may support radio frequency
beamforming for a signal transmitted via an antenna port.
[0084] The base stations 105 or the UEs 115 may use MIMO
communications to exploit multipath signal propagation and increase
the spectral efficiency by transmitting or receiving multiple
signals via different spatial layers. Such techniques 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 (e.g.,
different codewords). 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.
[0085] 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, a UE 115)
to shape or steer an antenna beam (e.g., a transmit beam, a 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 some 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 amplitude
offsets, phase offsets, or both to signals carried via 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).
[0086] A base station 105 or a UE 115 may use beam sweeping
techniques as part of beam forming operations. For example, a base
station 105 may use multiple antennas or antenna arrays (e.g.,
antenna panels) to conduct beamforming operations for directional
communications with a UE 115. 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. For example, the base station 105
may transmit a signal 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 a transmitting device, such as a base station 105, or by
a receiving device, such as a UE 115) a beam direction for later
transmission or reception by the base station 105.
[0087] 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 on a signal that was transmitted
in one or more 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 may report to the base station 105 an
indication of the signal that the UE 115 received with a highest
signal quality or an otherwise acceptable signal quality.
[0088] In some examples, transmissions by a device (e.g., by a base
station 105 or a UE 115) may be performed using multiple beam
directions, and the device may use a combination of digital
precoding or radio frequency beamforming to generate a combined
beam for transmission (e.g., from a base station 105 to a UE 115).
The UE 115 may report feedback that indicates precoding weights for
one or more beam directions, and the feedback may correspond to a
configured number of beams across a system bandwidth or one or more
sub-bands. The base station 105 may transmit a reference signal
(e.g., a cell-specific reference signal (CRS), a channel state
information reference signal (CSI-RS)), which may be precoded or
unprecoded. The UE 115 may provide feedback for beam selection,
which may be a precoding matrix indicator (PMI) or codebook-based
feedback (e.g., a multi-panel type codebook, a linear combination
type codebook, a port selection type codebook). 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 for
transmitting a signal in a single direction (e.g., for transmitting
data to a receiving device).
[0089] A receiving device (e.g., a UE 115) may try multiple receive
configurations (e.g., directional listening) 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 (e.g., different directional listening weight sets)
applied to signals received at multiple antenna elements of an
antenna array, or by processing received signals according to
different receive beamforming weight sets applied to signals
received at multiple antenna elements of an antenna array, any of
which may be referred to as "listening" according to different
receive configurations or receive directions. In some examples, a
receiving device may use a single receive configuration to receive
along a single beam direction (e.g., when receiving a data signal).
The single receive configuration may be aligned in a beam direction
determined based on listening according to different receive
configuration directions (e.g., a beam direction determined to have
a highest signal strength, highest signal-to-noise ratio (SNR), or
otherwise acceptable signal quality based on listening according to
multiple beam directions).
[0090] The wireless communications system 100 may be a packet-based
network that operates 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 error detection
techniques, error correction techniques, or both to support
retransmissions 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 a core
network 130 supporting radio bearers for user plane data. At the
physical layer, transport channels may be mapped to physical
channels.
[0091] The UEs 115 and the base stations 105 may support
retransmissions of data to increase the likelihood that data is
received successfully. Hybrid automatic repeat request (HARQ)
feedback is one technique for 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.,
low signal-to-noise conditions). In some examples, a 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.
[0092] In some examples, a UE 115 may transmit signaling to a base
station 105 that includes a TA value, which may enable the base
station 105 to receive the signaling within a frame or subframe
boundary (e.g., at the same time in a synchronized system). The TA
value may equal an RTT between the UE 115 and the base station 105,
which may include the time between transmission and reception of a
signal. In some cases, the RTT may change due to changes in the UE
115 location, changes in the UE 115 environment, or both. The base
station 105 may transmit a command to the UE 115 to perform a TA
adjustment based on the RTT change. In some examples, a UE 115 may
perform a receive timing adjustment, which may be different than a
TA adjustment. The UE 115 may perform the receive timing adjustment
based on changes to one or more parameters of received SSBs. For
example, the UE 115 may perform the receive timing adjustment if a
value of a parameter exceeds a threshold value, a difference
between values of SSB parameters exceed a threshold value, or the
like. In some cases, such as when the UE 115 changes location or
the channel environment changes, the UE 115 may perform the TA
adjustment, a receive timing adjustment, or both. For example, the
UE 115 may autonomously adjust a TA value, which may decrease the
signaling overhead at the base station 105. However, the UE 115 may
autonomously adjust the TA value at an unnecessarily high frequency
(e.g., too often), which may cause unnecessary power consumption at
the UE 115.
[0093] Wireless communications system 100 may support techniques
that enable a base station 105 to select a TA adjustment scheme
from a set of TA adjustment schemes. For example, a base station
105 may configure a UE 115 to use a TA adjustment scheme based on
different signaling scenarios, which may reduce unnecessary TA
adjustments at the UE 115. In some cases, the UE 115 may transmit a
capability or mobility mode indication to the base station 105
(e.g., include a timing accuracy of the UE 115, mobility
information of the UE 115, a mobility mode, a capability of the UE
to operating using the one or more of the TA adjustment schemes, or
a combination thereof). In some examples, the base station 105 may
receive the capability or mobility mode indication from the UE 115
and may select a TA adjustment scheme based on the information
included in the indication. For example, if the UE 115 is in a
high-mobility mode, the base station 105 may select a TA adjustment
scheme in which the UE 115 autonomously performs a TA adjustment.
In some examples, the base station 105 may select a TA adjustment
scheme in which the UE 115 adjusts a TA value after receiving a
command from the base station 105. In some examples, the base
station 105 may select a TA adjustment scheme in which the UE 115
may transmit a message to the base station 105 including a proposed
TA adjustment, and the UE 115 may adjust the TA value after
receiving an approval message from the base station 105. In some
cases, base station 105-a may transmit a TA adjustment scheme
configuration to the UE 115, which may include an indication of the
selected TA adjustment scheme. In some examples, the UE 115 may
adjust a TA value for an uplink transmission based on applying the
TA adjustment scheme.
[0094] FIG. 2 illustrates an example of a wireless communications
system 200 that supports dynamic TA adjustment schemes in
accordance with aspects of the present disclosure. In some
examples, the wireless communications system 200 may implement
aspects of the wireless communications system 100 and may include
UE 115-a and base station 105-a with coverage area 110-a, which may
be examples of a UE 115 and a base station 105 with a coverage area
110 as described with reference to FIG. 1. In some cases, UE 115-a
may communicate with base station 105-a by receiving control
signaling or data via downlink communication link 205, transmitting
control signaling or data via uplink communication link 210, or
both. For example, base station 105-a may configure UE 115-a with a
TA adjustment scheme to update a TA value for an uplink
transmission from UE 115-a to base station 105-a.
[0095] In some examples, UE 115-a may transmit signaling to base
station 105-a that includes a TA value, which may enable base
station 105-a to receive the signaling within a frame or subframe
boundary (e.g., at the same time in a synchronized system). The TA
value may equal an RTT between UE 115-a and base station 105-a,
which may include the time between transmission and reception of a
signal, such as a feedback message (e.g., an acknowledgment (ACK)
message). In some cases, the RTT may change due to changes in a
location of UE 115-a, changes in the environment at or near UE
115-a, or both. The base station 105 may transmit a command to UE
115-a to perform a TA adjustment based on the RTT change. For
example, the RTT may increase in some scenarios, such as when UE
115-a moves away from base station 105-a (e.g., in scenarios where
UE 115-a may be travelling relatively fast, such as when located on
a high-speed train), and base station 105-a may transmit a command
to UE 115-a to increase the TA value.
[0096] In some examples, UE 115-a may perform a receive timing
adjustment, which may be different than a TA adjustment. UE 115-a
may perform the receive timing adjustment based on changes to one
or more parameters (e.g., a reference signal received power (RSRP),
a location of UE 115-a, or the like) of received SSBs. For example,
UE 115-a may perform the receive timing adjustment if a value of a
parameter exceeds a threshold value, a difference between values of
SSB parameters exceed a threshold value, or the like. The value of
the parameters of one or more SSBs may be different due to errors
in the timing clock of UE 115-a, changes to downlink transmission
timing made by base station 105-a (e.g., via medium access
control-control element (MAC-CE)), changes in location of UE 115-a,
changes in a channel environment (e.g., a channel may change from a
line-of-sight (LOS) channel to a non-line-of-sight (NLOS) channel),
or a combination thereof. In some examples, UE 115-a may perform
the receive timing adjustment more frequently or less frequently
based on the speed, environment, or both, of UE 115-a. For example,
UE 115-a may perform the receive timing adjustment less often when
UE 115-a moves around at a relatively low speed when compared with
a relatively high speed application (e.g., a high-speed train). In
some cases, such as when UE 115-a changes location or the channel
environment changes, UE 115-a may perform the TA adjustment in
addition to, or as an alternative to, performing a receive timing
adjustment. In some examples, the change in location of UE 115-a or
the change in the channel environment may trigger UE 115-a to
perform the TA adjustment. Additionally or alternatively, the
receive timing adjustment performed by UE 115-a may trigger UE
115-a to perform the TA adjustment.
[0097] In some examples, UE 115-a may autonomously perform a TA
adjustment when a receive timing difference between received SSBs
is less than a threshold, which may be referred to as a gradual
timing adjustment, or is greater than a threshold, which may be
referred to as a one-shot timing adjustment. For example, the
receive timing difference between SSBs may be the difference in
reception time at UE 115-a before and after the one-shot timing
adjustment, in accordance with .DELTA.T=|T.sub.1-T.sub.2|, where
.DELTA.T may be the receive timing difference, T.sub.1 may be the
reception time at the UE before the one-shot timing adjustment, and
T.sub.2 may be the reception time used after the one-shot timing
adjustment. In some cases, when UE 115-a performs a one-shot timing
adjustment, the TA adjustment value may be based on the receive
timing adjustment (e.g., twice the receive timing adjustment). For
example, UE 115-a transmit timing may change after the one-shot
timing adjustment based on T.sub.2-(N.sub.TA+N.sub.TA
offset)+.sup.2.times.(T.sub.1-T.sub.2), where N.sub.TA=TA.times.16,
TA may be the TA value, and N.sub.TA offset may be a time offset
from N.sub.TA.
[0098] In some examples, UE 115-a may perform a one-shot timing
adjustment to reduce signaling overhead when the base station 105
transmits a command to UE 115-a to adjust a TA value, which may be
desirable in scenarios where UE 115-a may be moving around
frequently, rapidly, or both. For example, UE 115-a may be moving
at high speed or located on a high-speed vehicle, such as a
high-speed train (e.g., moving at 500 kilometers per hour (km/h)),
and may receive a transmission including one or more symbols. UE
115-a may autonomously adjust the TA value when a timing error of
the one or more symbols exceeds a threshold value, which may be
configured at UE 115-a (e.g., one-fourth of a maximum timing error
(e.g., 0.097 microseconds)). The signaling overhead at base station
105-a and UE 115-a may decrease due to UE 115-a autonomously
adjusting the TA value at a relatively frequent periodicity (e.g.,
every 50 milliseconds) instead of receiving multiple commands from
base station 105-a to adjust the TA value. In some examples,
multiple UEs 115 may be moving at high speed or located on the
high-speed vehicle, and each UE 115 may autonomously adjust each
respective TA value, which may further decrease the signaling
overhead at base station 105-a. However, UE 115-a autonomously
adjusting the TA value may be unnecessary and may introduce errors
in communication between UE 115-a and base station 105-a in cases
where the receive timing difference changes due to causes other
than changes to the location of UE 115-a (e.g., due to errors in
the timing clock of the UE 115 or an IAB node, changes to downlink
transmission timing made by base station 105-a, or the like). For
example, an unnecessarily adjusted TA value may cause a disruption
to the synchronized signaling at base station 105-a, may cause
unnecessary power consumption at UE 115-a, or both.
[0099] In some examples, base station 105-a may dynamically
configure UE 115-a to use a TA adjustment scheme based on different
environments, conditions, deployments, or signaling scenarios,
which may reduce unnecessary TA adjustments at UE 115-a, reduce
signaling overhead, or both. For example, in cases where UE 115-a
is moving at a relatively high speed, base station 105-a may
configure UE 115-a with a different TA adjustment scheme than other
cases where UE 115-a is moving at a relatively slow speed (e.g., in
an IAB network). In some cases, UE 115-a may transmit a message
including a capability or mobility mode indication 215 to base
station 105-a via uplink communication link 210 (e.g., via a
downlink control information (DCI) message, RRC signaling, a
MAC-CE, or the like). The capability or mobility mode indication
215 may include at least one of a capability mode or a mobility
mode at UE 115-a. For example, the capability or mobility mode
indication 215 may include capability information for one or more
TA adjustment schemes, such as a timing accuracy (e.g., a timing
clock accuracy) of UE 115-a, mobility information (e.g., changes in
position, environmental conditions, or the like) of UE 115-a, a
mobility mode (e.g., a high-speed mode, a low-speed mode, or the
like), a capability of the UE to operating using the one or more of
the TA adjustment schemes, or any combination thereof.
[0100] Base station 105-a may receive the capability or mobility
mode indication 215 from UE 115-a, and may select a TA adjustment
scheme based on the information included in the indication. In some
examples, base station 105-a may select a TA adjustment scheme in
which UE 115-a adjusts a TA value after receiving a command from
base station 105-a, which is described in further detail with
respect to FIG. 3. In some other examples, if UE 115-a is in a
high-mobility mode, base station 105-a may select a TA adjustment
scheme in which UE 115-a autonomously performs a TA adjustment,
which is described in further detail with respect to FIG. 4. In
some cases, UE 115-a may transmit a message informing base station
105-a of the autonomous TA adjustment. In some other cases, UE
115-a may not transmit a message informing base station 105-a of
the autonomous TA adjustment. In some examples, base station 105-a
may select a TA adjustment scheme in which UE 115-a may transmit a
message to base station 105-a including a proposed TA adjustment,
and UE 115-a may adjust the TA value after receiving an approval
message from base station 105-a, which is described in further
detail with respect to FIG. 5. In some cases, UE 115-a may
determine a TA adjustment value based on measuring one or more SSB
parameters (e.g., an RSRP value, parameters related to the location
of UE 115-a, or both). Additionally or alternatively, base station
105-a may configure UE 115-a with one or more algorithms (e.g.,
machine learning algorithms) that use the RSRP values of the SSBs
to determine TA values for adjustment.
[0101] In some cases, base station 105-a may transmit a message
including a TA adjustment scheme configuration 220 to UE 115-a via
downlink communication link 205, which may include an indication of
the selected TA adjustment scheme. Base station 105-a may transmit
a TA adjustment scheme configuration 220 after receiving the
capability or mobility mode indication 215 and determining that UE
115-a is in a given mobility mode, a given environment, or is
otherwise capable of supporting the TA adjustment scheme. UE 115-a
may apply the TA adjustment scheme by adjusting a TA value for an
uplink transmissions to base station 105-a based on receiving a
command from base station 105-a, autonomously, based on proposing a
TA value to base station 105-a, or the like. In some examples, UE
115-a may adjust the TA value (e.g., increase the TA value,
decrease the TA value, or maintain the TA value) due to a change in
location of UE 115-a, a change in a mobility mode of UE 115-a, a
change in a channel environment, a receive timing difference of
SSBs being greater than a threshold, or the like. For example, UE
115-a may be dynamically configured with a TA adjustment scheme in
which UE 115-a may adjust the TA value after receiving a command
from base station 105-a. Base station 105-a may refrain from
transmitting a command to UE 115-a to adjust the TA value when an
error in the timing clock at UE 115-a causes a receive timing
difference between SSBs, and UE 115-a may thus maintain the TA
value. UE 115-a may transmit an uplink message 230 to base station
105-a via uplink communication link 210, where the uplink message
230 may have the adjusted TA value applied when transmitted. Base
station 105-a may receive the uplink message 230 within a similar
frame or subframe as other uplink transmissions from other UEs
115.
[0102] In some cases, UE 115-a may transmit, to base station 105-a,
the report indicating a TA adjustment value (e.g., such as when UE
115-a autonomously adjusted its TA) or indicating one or more
preferred TA adjustment values, and UE 115-a may wait some amount
of time for an acknowledgment (e.g., an ACK or some feedback
message) of the report from base station 105-a. The ACK may include
an ACK to a message transmitted over an uplink channel (e.g.,
PUSCH, PUCCH) carrying the report. Additionally or alternatively,
the ACK may include another TA command from base station 105-a. In
other examples, if no ACK is received from base station 105-a
within some time period, UE 115-a may resend the report to base
station 105-a.
[0103] In cases where UE 115-a indicates a requested TA adjustment
value via the report, and UE 115-a subsequently receives a message
approving or configuring the requested TA adjustment value, the TA
adjustment may be applied some amount of time after receiving the
ACK from base station 105-a. In some examples, if the ACK received
from base station 105-a is an ACK for the uplink channel (e.g.,
PUSCH, PUCCH) over which the report was transmitted, UE 115-a may
apply the requested TA value. That is, the ACK may serve as the
approval of the requested TA adjustment value. In other cases, such
as when the ACK is another TA command from base station 105-a, UE
115-a may apply the TA adjustment value indicated in the TA
command.
[0104] In cases where UE 115-a autonomously applies a TA adjustment
value and reports the TA adjustment value to base station 105-a, UE
115-a may receive an ACK in response to the report. If the ACK
received by UE 115-a is a TA command (e.g., a new or additional TA
command), there may be some issues if UE 115-a also receives a TA
adjustment command after (e.g., immediately after) autonomously
adjusting its TA but before receiving the ACK for the report
(including an indication of the autonomous TA adjustment). In such
cases, UE 115-a may be unaware of which TA value may be used for
the TA adjustment (e.g., the TA value before UE 115-a applies the
autonomous TA adjustment or the TA value (in the command) received
after the TA adjustment is reported). Accordingly, a TA command
received by UE 115-a prior to receiving an acknowledgment to the
reported TA value may be meant for a TA value signaled prior to the
autonomous TA adjustment (e.g., an old TA).
[0105] FIG. 3 illustrates an example of a process flow 300 in a
system that supports dynamic TA adjustment schemes in accordance
with aspects of the present disclosure. In some examples, process
flow 300 may implement aspects of the wireless communications
system 100 or the wireless communications system 200. The process
flow 300 may illustrate an example of a base station 105, such as
base station 105-b, configuring a UE 115, such as UE 115-b, with a
TA adjustment scheme based on a capability or mobility mode of the
UE 115. For example, base station 105-b may configure UE 115-b to
adjust a TA value after receiving a command from base station
105-a. Alternative examples of the following may be implemented,
where some processes are performed in a different order than
described or are not performed. In some cases, processes may
include additional features not mentioned below, or further
processes may be added.
[0106] At 305, UE 115-b may transmit information for a TA
adjustment procedure at UE 115-b to base station 105-b. For
example, UE 115-b may transmit at least one of a UE capability or
mobility mode of UE 115-b. In some cases, the information may
include a capability for the UE to support one or more TA
adjustment schemes, one or more environmental conditions associated
with the UE, or both.
[0107] At 310, base station 105-b may select a TA adjustment scheme
based on the information from UE 115-b. For example, base station
105-b may select a TA adjustment scheme in which UE 115-b adjust a
TA value based on receiving a command from base station 105-b.
[0108] At 315, base station 105-b may transmit an indication of the
selected TA adjustment scheme to UE 115-b. For example, base
station 105-b may dynamically configure UE 115-b with the TA
adjustment scheme (e.g., via a DCI message).
[0109] At 320, UE 115-b may receive a command to perform the TA
adjustment procedure from base station 105-b. The command may
include an indication of a TA adjustment value for the TA
adjustment procedure at UE 115-b. The TA adjustment value may be
based on at least one of the UE capability or mobility mode. For
example, UE 115-b may receive a message from base station 105-b
configuring the indicated TA adjustment value.
[0110] At 325, UE 115-b may apply a TA adjustment value to an
uplink message to base station 105-b. For example, UE 115-b may
adjust a TA value based on the TA value indicated in the command
from base station 105-b. That is, UE 115-b may determine the TA
adjustment value based on at least one of the UE capability or
mobility mode and the command from base station 105-b. UE 115-b may
perform the TA adjustment procedure using the determined TA
adjustment value, which may be indicated in the command from base
station 105-b.
[0111] At 330, UE 115-b may transmit the uplink transmission based
on adjusting the TA value at 325.
[0112] FIG. 4 illustrates an example of a process flow 400 in a
system that supports dynamic TA adjustment schemes in accordance
with aspects of the present disclosure. In some examples, process
flow 400 may implement aspects of the wireless communications
system 100, the wireless communications system 200, the process
flow 300, or a combination thereof. The process flow 400 may
illustrate an example of a base station 105, such as base station
105-c, configuring a UE 115, such as UE 115-c, with a TA adjustment
scheme based on a capability or mobility mode of the UE 115. For
example, base station 105-c may configure UE 115-c to autonomously
adjust a TA value. Alternative examples of the following may be
implemented, where some processes are performed in a different
order than described or are not performed. In some cases, processes
may include additional features not mentioned below, or further
processes may be added.
[0113] At 405, UE 115-c may perform an uplink transmission (e.g.,
transmit an uplink message) to base station 105-c, where the uplink
transmission may have a TA value applied (which may be an original
TA value previously configured by base station 105-c and signaled
to UE 115-c). In some cases, however, UE 115-c may perform an
autonomous TA adjustment (e.g., after the transmission at 405)
based on SSB parameters (e.g., an RSRP for one or more SSBs). In
such cases, base station 105-c may be unaware of the autonomous TA
adjustment at UE 115-c. For example, base station 105-c may assume
UE 115-c uses the original TA value for TA adjustment procedures
prior to and including the uplink transmission at 405, which base
station 105-c may have estimated based on a previous uplink
transmission.
[0114] At 410, base station 105-c may determine a TA adjustment
value for UE 115-c based on the uplink transmission with the
original TA value, based on an uplink reception window (e.g., a
window size, which may be unknown by UE 115-c), or the like. For
example, base station 105-c may determine UE 115-c is to update the
TA adjustment value based on one or more previous uplink
transmissions (e.g., a sounding reference signal (SRS) transmission
or a physical uplink control channel (PUCCH) transmission), and may
transmit an indication for UE 115-c to adjust the TA value without
knowing UE 115-c may have already autonomously adjusted its own TA
value. In some cases, base station 105-c may transmit a downlink
control channel order (e.g., a physical downlink control channel
(PDCCH) order) to trigger a transmission of, for example, a signal
over a physical random access channel (PRACH) that may be used for
TA measurement, which may be unnecessary if UE 115-c autonomously
adjusted the TA value.
[0115] In some examples, at 415, UE 115-c may transmit information
for a TA adjustment procedure at UE 115-c to base station 105-c.
For example, UE 115-c may transmit at least one of a UE capability
or mobility mode of UE 115-c, as described with reference to FIGS.
2 and 3.
[0116] At 420, base station 105-c may select a TA adjustment scheme
based on the information from UE 115-c. For example, base station
105-c may select a TA adjustment scheme in which UE 115-c
autonomously adjusts a TA value (e.g., if UE 115-c is in a
high-mobility mode). Thus, base station 105-c may be aware of the
autonomous TA adjustment at UE 115-c.
[0117] At 425, base station 105-c may transmit an indication of the
selected TA adjustment scheme to UE 115-c. For example, base
station 105-c may dynamically configure UE 115-c with the TA
adjustment scheme (e.g., via a DCI message). In some cases, UE
115-c may autonomously perform the TA adjustment based on the
indication.
[0118] For example, at 430, UE 115-c may receive one or more SSBs,
and may determine a TA adjustment value for the autonomous TA
adjustment procedure based on the SSBs. In some cases, UE 115-c may
measure one or more parameters from multiple SSBs, where the one or
more parameters include an RSRP, a location of the UE, or both. UE
115-c may calculate the TA adjustment value based at least in part
on the one or more parameters.
[0119] At 435, UE 115-c may apply a TA adjustment value to an
uplink message to base station 105-c. For example, UE 115-c may
autonomously adjust a TA value, UE 115-c may determine the TA
adjustment value based on at least one of the UE capability or
mobility mode. UE 115-c may perform the TA adjustment procedure
using the autonomously determined TA adjustment value. In some
examples, UE 115-c may receive a message from base station 105-c
configuring an indicated TA adjustment value. UE 115-c may perform
a TA adjustment procedure based on receiving the message
configuring the indicated TA adjustment value. In addition, UE
115-c may refrain from applying the autonomously determined TA
value or from transmitting an indication of the autonomously
determined TA value for a duration based on receiving the message
configuring the TA adjustment value.
[0120] In some cases, at 440, UE 115-c may transmit a message
informing base station 105-a of the autonomous TA adjustment. For
example, UE 115-c may transmit an indication of the determined TA
adjustment value based on performing the TA adjustment procedure at
435. UE 115-c may transmit the indication of the determined TA
adjustment value using uplink control information (UCI) over an
uplink shared channel (e.g., a PUCCH, a physical uplink shared
channel (PUSCH), or the like), UCI over an uplink control channel,
a MAC-CE, or any combination thereof. In some cases, UE 115-c may
transmit the MAC-CE in a PUSCH scheduled by an uplink grant (e.g.,
a known uplink grant). In some other cases, UE 115-c may transmit a
scheduling request to base station 105-c to request a new grant in
the PUSCH to send the MAC-CE. The TA adjustment value indicated in
the UE request or report may follow the same indication rule as the
TA adjustment indication in a base station side TA adjustment
command. In some examples, UE 115-c may indicate the TA reporting
per beam, per antenna panel, per transmission reception point
(TRP), per beam group, per TA group, or any combination thereof.
For example, a beam, a panel, a TRP, a beam group ID, or a
combination thereof may be included in the TA adjustment value
report from UE 115-c. In some cases, the TA adjustment scheme may
be configured for one or more transmit beams (e.g., for the beam),
the antenna panel, the TRP, the beam group, the TA group, or any
combination thereof. In some other cases, UE 115-c may not transmit
a message informing base station 105-a of the autonomous TA
adjustment.
[0121] UE 115-c may receive a configuration of a TA adjustment
value from base station 105-c after transmitting the indication of
the TA adjustment value to base station 105-c. UE 115-c may perform
an additional TA adjustment procedure using the configured TA
adjustment value. For example, UE 115-c may perform the additional
TA adjustment procedure based on determining that the configuration
of the TA adjustment value is received within a threshold time
period after transmitting the indication of the TA adjustment value
at 440. In some cases, UE 115-c may refrain from requesting or
applying an autonomous TA adjustment for a time period after
receiving the TA adjustment configuration (e.g., a command) from
base station 105-c. In some examples, if base station 105-c already
requested for UE 115-c to send a signal (e.g., based on a PDCCH
order) that base station 105-c may potentially use for TA
measurement, UE 115-c may hold its autonomous TA adjustment or
request for a time period. For example, if UE 115-c receives a
downlink control channel order from base station 105-c for
performing a random access procedure, UE 115-c may refrain from
performing the TA adjustment procedure using the determined TA
adjustment value based on the downlink control channel order being
received within a threshold time period of determining the TA
adjustment value.
[0122] In some cases, if UE 115-c receives a TA adjustment command
from base station 105-c, then UE 115-c may apply a TA adjustment
based on the command. In some other cases, if UE 115-c does not
receive a TA adjustment command from base station 105-c in the time
period, then UE 115-c may apply or request a new TA adjustment
value after the time period. At 445, UE 115-c may transmit the
uplink message based on adjusting the TA value at 435.
[0123] FIG. 5 illustrates an example of a process flow 500 in a
system that supports dynamic TA adjustment schemes in accordance
with aspects of the present disclosure. In some examples, process
flow 500 may implement aspects of the wireless communications
system 100, the wireless communications system 200, the process
flow 300, the process flow 400, or a combination thereof. The
process flow 500 may illustrate an example of a base station 105,
such as base station 105-d, configuring a UE 115, such as UE 115-d,
with a TA adjustment scheme based on a capability or mobility mode
of the UE 115. For example, base station 105-d may configure UE
115-d to transmit a message to base station 105-d including a
proposed TA adjustment, and UE 115-d may adjust the TA value after
receiving an approval message from base station 105-d. Alternative
examples of the following may be implemented, where some processes
are performed in a different order than described or are not
performed. In some cases, processes may include additional features
not mentioned below, or further processes may be added.
[0124] At 505, UE 115-d may perform an uplink transmission to base
station 105-d using an original TA value (e.g., a TA value that was
previously indicated to UE 115-d).
[0125] At 510, base station 105-d may determine a first TA
adjustment value for UE 115-d based on the uplink transmission with
the original TA value, based on an uplink reception window (e.g., a
window size, which may be unknown by UE 115-d), or the like. For
example, base station 105-d may determine UE 115-d is to update the
TA adjustment value based on one or more previous uplink
transmissions (e.g., an SRS transmission or PUCCH
transmission).
[0126] In some examples, at 515, UE 115-d may transmit information
for a TA adjustment procedure at UE 115-d to base station 105-d.
For example, UE 115-d may transmit at least one of a UE capability
or mobility mode of UE 115-d.
[0127] At 520, base station 105-d may select a TA adjustment scheme
based on the information from UE 115-d. For example, base station
105-d may select a TA adjustment scheme in which UE 115-d transmits
a message to base station 105-d including a proposed TA adjustment,
and UE 115-d may adjust the TA value after receiving an approval
message (e.g., a feedback message) from base station 105-d.
[0128] At 525, base station 105-d may transmit an indication of the
selected TA adjustment scheme to UE 115-d. For example, base
station 105-d may dynamically configure UE 115-d with the TA
adjustment scheme (e.g., via a DCI message).
[0129] In some cases, at 530, UE 115-d may receive one or more
SSBs, and may determine a second TA adjustment value for the TA
adjustment procedure based on the SSBs. For example, at 535, UE
115-d may measure one or more parameters from multiple SSBs, where
the one or more parameters include an RSRP, a location of the UE,
or both. UE 115-d may calculate the second TA adjustment value
based at least in part on the one or more parameters.
[0130] At 540 and 545, base station 105-d and UE 115-d may transmit
an indication of the first TA adjustment value (e.g., in a TA
adjustment command) and the second TA adjustment value (e.g., in a
TA adjustment report or request) to UE 115-d and base station
105-d, respectively. In some examples, if UE 115-d transmits the TA
adjustment report or request a number of symbols (e.g., a decoding
time 550) before receiving the TA adjustment command from base
station 105-d, then base station 105-d may discard the report or
request. The decoding time, or the number of symbols, may be the
time UE 115-d uses to decode the TA adjustment command. In some
cases, UE 115-d may transmit the indication of the second TA
adjustment value after receiving the TA adjustment command from
base station 105-d but before decoding the command. In some
examples, UE 115-d may readjust a TA value based on the TA
adjustment command from base station 105-d, and UE 115-d may use
the original TA value plus the TA adjustment in the command.
[0131] At 555, base station 105-d may transmit a feedback message
to UE 115-d based on receiving the second TA adjustment value from
UE 115-d. For example, base station 105-d may transmit an ACK
message in response to the PUSCH or PUCCH carrying the report
including the TA adjustment value. In some cases, UE 115-d may
monitor for the feedback message from base station 105-d for a
duration after transmitting the indication of the determined second
TA adjustment value. UE 115-d may receive the feedback message
comprising feedback information from base station 105-d and during
the duration. In some cases, the feedback message may indicate an
additional TA adjustment value.
[0132] In some cases, UE 115-d may monitor for the feedback message
from base station 105-d for a duration after transmitting the
indication of the determined second TA adjustment value. UE 115-d
may transmit an additional indication of the determined second TA
adjustment value to base station 105-d based on failing to receive
the feedback message during the duration (e.g., UE 115-d may resend
the report).
[0133] At 560, UE 115-d may apply a TA adjustment value to an
uplink message to base station 105-d based on receiving the
feedback message. For example, UE 115-d may adjust a TA value based
on the second TA adjustment value included in the report to base
station 105-d. UE 115-d may determine the TA adjustment value based
on at least one of the UE capability or mobility mode. In some
cases, UE 115-d may adjust the TA value a duration after receiving
the feedback message from base station 105-d. For example, if the
feedback message is an ACK for the PUSCH or PUCCH, UE 115-d may
apply the second TA adjustment value. In some examples, if the
feedback message indicates an additional TA adjustment value (e.g.,
is another TA adjustment command), UE 115-d may apply the TA
adjustment value indicated in the feedback message. For example, UE
115-d may perform another TA adjustment procedure using the
additional TA adjustment value (e.g., included in the feedback
message).
[0134] In some cases, if the feedback message indicates the
additional TA adjustment value, UE 115-d may receive the additional
TA adjustment value after adjusting the TA value but before
receiving the feedback message. Thus, UE 115-d may be unsure of
which TA value to adjust (e.g., the TA adjustment value from before
or after UE applies an autonomous TA adjustment). In some examples,
base station 105-d may specify or otherwise configure the behavior
at UE 115-d such that any TA adjustment command received before the
feedback message for the TA adjustment value report is meant for
the original TA value.
[0135] At 565, UE 115-d may transmit the uplink transmission based
on adjusting the TA value at 560.
[0136] FIG. 6 shows a block diagram 600 of a device 605 that
supports dynamic TA adjustment schemes in accordance with aspects
of the present disclosure. The device 605 may be an example of
aspects of a UE 115 as described herein. The device 605 may include
a receiver 610, a transmitter 615, and a communications manager
620. The device 605 may also include a processor. Each of these
components may be in communication with one another (e.g., via one
or more buses).
[0137] The receiver 610 may provide a means for receiving
information such as packets, user data, control information, or any
combination thereof associated with various information channels
(e.g., control channels, data channels, information channels
related to dynamic TA adjustment schemes). Information may be
passed on to other components of the device 605. The receiver 610
may utilize a single antenna or a set of multiple antennas.
[0138] The transmitter 615 may provide a means for transmitting
signals generated by other components of the device 605. For
example, the transmitter 615 may transmit information such as
packets, user data, control information, or any combination thereof
associated with various information channels (e.g., control
channels, data channels, information channels related to dynamic TA
adjustment schemes). In some examples, the transmitter 615 may be
co-located with a receiver 610 in a transceiver module. The
transmitter 615 may utilize a single antenna or a set of multiple
antennas.
[0139] The communications manager 620, the receiver 610, the
transmitter 615, or various combinations thereof or various
components thereof may be examples of means for performing various
aspects of dynamic TA adjustment schemes as described herein. For
example, the communications manager 620, the receiver 610, the
transmitter 615, or various combinations or components thereof may
support a method for performing one or more of the functions
described herein.
[0140] In some examples, the communications manager 620, the
receiver 610, the transmitter 615, or various combinations or
components thereof may be implemented in hardware (e.g., in
communications management circuitry). The hardware may include a
processor, a digital signal processor (DSP), an
application-specific integrated circuit (ASIC), a
field-programmable gate array (FPGA) or other programmable logic
device, a discrete gate or transistor logic, discrete hardware
components, or any combination thereof configured as or otherwise
supporting a means for performing the functions described in the
present disclosure. In some examples, a processor and memory
coupled with the processor may be configured to perform one or more
of the functions described herein (e.g., by executing, by the
processor, instructions stored in the memory).
[0141] Additionally or alternatively, in some examples, the
communications manager 620, the receiver 610, the transmitter 615,
or various combinations or components thereof may be implemented in
code (e.g., as communications management software or firmware)
executed by a processor. If implemented in code executed by a
processor, the functions of the communications manager 620, the
receiver 610, the transmitter 615, or various combinations or
components thereof may be performed by a general-purpose processor,
a DSP, a central processing unit (CPU), an ASIC, an FPGA, or any
combination of these or other programmable logic devices (e.g.,
configured as or otherwise supporting a means for performing the
functions described in the present disclosure).
[0142] In some examples, the communications manager 620 may be
configured to perform various operations (e.g., receiving,
monitoring, transmitting) using or otherwise in cooperation with
the receiver 610, the transmitter 615, or both. For example, the
communications manager 620 may receive information from the
receiver 610, send information to the transmitter 615, or be
integrated in combination with the receiver 610, the transmitter
615, or both to receive information, transmit information, or
perform various other operations as described herein.
[0143] The communications manager 620 may support wireless
communications at a UE in accordance with examples as disclosed
herein. For example, the communications manager 620 may be
configured as or otherwise support a means for transmitting a first
message including information associated with a TA adjustment
procedure at the UE, where the information includes at least one of
a UE capability or mobility mode of the UE. The communications
manager 620 may be configured as or otherwise support a means for
receiving a second message configuring the UE with a TA adjustment
scheme that is from a set of multiple TA adjustment schemes, the TA
adjustment scheme being based on the first message. The
communications manager 620 may be configured as or otherwise
support a means for transmitting an uplink message based on
performing the TA adjustment procedure, where the TA adjustment
procedure includes applying a TA adjustment value to the uplink
message in accordance with the TA adjustment scheme.
[0144] By including or configuring the communications manager 620
in accordance with examples as described herein, the device 605
(e.g., a processor controlling or otherwise coupled to the receiver
610, the transmitter 615, the communications manager 620, or a
combination thereof) may support techniques for reduced processing,
reduced power consumption, more efficient utilization of
communication resources based on the base station 105 selecting a
TA adjustment scheme for adjusting a TA value at the UE 115.
[0145] FIG. 7 shows a block diagram 700 of a device 705 that
supports dynamic TA adjustment schemes in accordance with aspects
of the present disclosure. The device 705 may be an example of
aspects of a device 605 or a UE 115 as described herein. The device
705 may include a receiver 710, a transmitter 715, and a
communications manager 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).
[0146] The receiver 710 may provide a means for receiving
information such as packets, user data, control information, or any
combination thereof associated with various information channels
(e.g., control channels, data channels, information channels
related to dynamic TA adjustment schemes). Information may be
passed on to other components of the device 705. The receiver 710
may utilize a single antenna or a set of multiple antennas.
[0147] The transmitter 715 may provide a means for transmitting
signals generated by other components of the device 705. For
example, the transmitter 715 may transmit information such as
packets, user data, control information, or any combination thereof
associated with various information channels (e.g., control
channels, data channels, information channels related to dynamic TA
adjustment schemes). In some examples, the transmitter 715 may be
co-located with a receiver 710 in a transceiver module. The
transmitter 715 may utilize a single antenna or a set of multiple
antennas.
[0148] The device 705, or various components thereof, may be an
example of means for performing various aspects of dynamic TA
adjustment schemes as described herein. For example, the
communications manager 720 may include a TA component 725, a TA
scheme component 730, an uplink component 735, or any combination
thereof. The communications manager 720 may be an example of
aspects of a communications manager 620 as described herein. In
some examples, the communications manager 720, or various
components thereof, may be configured to perform various operations
(e.g., receiving, monitoring, transmitting) using or otherwise in
cooperation with the receiver 710, the transmitter 715, or both.
For example, the communications manager 720 may receive information
from the receiver 710, send information to the transmitter 715, or
be integrated in combination with the receiver 710, the transmitter
715, or both to receive information, transmit information, or
perform various other operations as described herein.
[0149] The communications manager 720 may support wireless
communications at a UE in accordance with examples as disclosed
herein. The TA component 725 may be configured as or otherwise
support a means for transmitting a first message including
information associated with a TA adjustment procedure at the UE,
where the information includes at least one of a UE capability or
mobility mode of the UE. The TA scheme component 730 may be
configured as or otherwise support a means for receiving a second
message configuring the UE with a TA adjustment scheme that is from
a set of multiple TA adjustment schemes, the TA adjustment scheme
being based on the first message. The uplink component 735 may be
configured as or otherwise support a means for transmitting an
uplink message based on performing the TA adjustment procedure,
where the TA adjustment procedure includes applying a TA adjustment
value to the uplink message in accordance with the TA adjustment
scheme.
[0150] FIG. 8 shows a block diagram 800 of a communications manager
820 that supports dynamic TA adjustment schemes in accordance with
aspects of the present disclosure. The communications manager 820
may be an example of aspects of a communications manager 620, a
communications manager 720, or both, as described herein. The
communications manager 820, or various components thereof, may be
an example of means for performing various aspects of dynamic TA
adjustment schemes as described herein. For example, the
communications manager 820 may include a TA component 825, a TA
scheme component 830, an uplink component 835, a time period
component 840, a feedback component 845, or any combination
thereof. Each of these components may communicate, directly or
indirectly, with one another (e.g., via one or more buses).
[0151] The communications manager 820 may support wireless
communications at a UE in accordance with examples as disclosed
herein. The TA component 825 may be configured as or otherwise
support a means for transmitting a first message including
information associated with a TA adjustment procedure at the UE,
where the information includes at least one of a UE capability or
mobility mode of the UE. The TA scheme component 830 may be
configured as or otherwise support a means for receiving a second
message configuring the UE with a TA adjustment scheme that is from
a set of multiple TA adjustment schemes, the TA adjustment scheme
being based on the first message. The uplink component 835 may be
configured as or otherwise support a means for transmitting an
uplink message based on performing the TA adjustment procedure,
where the TA adjustment procedure includes applying a TA adjustment
value to the uplink message in accordance with the TA adjustment
scheme.
[0152] In some examples, to support TA adjustment scheme, the TA
component 825 may be configured as or otherwise support a means for
determining the TA adjustment value based on the information
associated with the TA adjustment procedure. In some examples, to
support TA adjustment scheme, the TA component 825 may be
configured as or otherwise support a means for performing the TA
adjustment procedure using the determined TA adjustment value.
[0153] In some examples, to support TA adjustment scheme, the TA
component 825 may be configured as or otherwise support a means for
transmitting, to a base station, an indication of the determined TA
adjustment value.
[0154] In some examples, the indication is transmitted based on
performing the TA adjustment procedure.
[0155] In some examples, the TA component 825 may be configured as
or otherwise support a means for receiving, from the base station,
a third message configuring the indicated TA adjustment value,
where the TA adjustment procedure is performed based on receiving
the third message configuring the indicated TA adjustment
value.
[0156] In some examples, the TA component 825 may be configured as
or otherwise support a means for determining a second TA adjustment
value based on the information associated with the TA adjustment
procedure. In some examples, the TA component 825 may be configured
as or otherwise support a means for refraining from applying the
second TA adjustment value or transmitting an indication of the
second TA adjustment value for a duration based on receiving the
third message configuring the indicated TA adjustment value.
[0157] In some examples, the TA component 825 may be configured as
or otherwise support a means for receiving, from the base station,
a configuration of a second TA adjustment value, where the
indication of the second TA adjustment value is received after
transmitting the indication of the TA adjustment value. In some
examples, the TA component 825 may be configured as or otherwise
support a means for performing a second TA adjustment procedure
using the second TA adjustment value based on the configuration of
the second TA adjustment value.
[0158] In some examples, the time period component 840 may be
configured as or otherwise support a means for determining that the
configuration of the second TA adjustment value is received within
a threshold time period after transmitting the indication of the TA
adjustment value, where performing the second TA adjustment
procedure is based on the determination that the configuration of
the second TA adjustment value is received within the threshold
time period.
[0159] In some examples, to support transmitting the indication of
the determined TA adjustment value, the TA component 825 may be
configured as or otherwise support a means for transmitting the
indication of the determined TA adjustment value using UCI over an
uplink shared channel, UCI over an uplink control channel, a
MAC-CE, or any combination thereof.
[0160] In some examples, the feedback component 845 may be
configured as or otherwise support a means for monitoring, for a
duration after transmitting the indication of the determined TA
adjustment value, for a feedback message from the base station. In
some examples, the feedback component 845 may be configured as or
otherwise support a means for receiving, from the base station and
during the duration, the feedback message including feedback
information, where the TA adjustment procedure is performed based
on receiving the feedback message.
[0161] In some examples, the feedback message indicates a second TA
adjustment value, and the TA component 825 may be configured as or
otherwise support a means for performing a second TA adjustment
procedure using the second TA adjustment value.
[0162] In some examples, the feedback component 845 may be
configured as or otherwise support a means for monitoring, for a
duration after transmitting the indication of the determined TA
adjustment value, for a feedback message from the base station. In
some examples, the feedback component 845 may be configured as or
otherwise support a means for transmitting, to the base station, an
additional indication of the determined TA adjustment value based
on failing to receive the feedback message during the duration.
[0163] In some examples, the determined TA adjustment value is
indicated per beam, per antenna panel, per TRP, per beam group, per
TA group, or any combination thereof. In some examples, the TA
adjustment scheme is configured for one or more transmit beams
corresponding to the beam, the antenna panel, the TRP, the beam
group, the TA group, or any combination thereof.
[0164] In some examples, to support determining the TA adjustment
value, the TA component 825 may be configured as or otherwise
support a means for measuring one or more parameters associated
with a set of multiple SSBs, where the one or more parameters
include a RSRP, a location of the UE, or both. In some examples, to
support determining the TA adjustment value, the TA component 825
may be configured as or otherwise support a means for calculating
the TA adjustment value based on the one or more parameters.
[0165] In some examples, the time period component 840 may be
configured as or otherwise support a means for receiving, from a
base station, a downlink control channel order for performing a
random access procedure. In some examples, the time period
component 840 may be configured as or otherwise support a means for
refraining from performing the TA adjustment procedure using the
determined TA adjustment value based on the downlink control
channel order being received within a threshold time period of
determining the TA adjustment value.
[0166] In some examples, to support TA adjustment scheme, the TA
component 825 may be configured as or otherwise support a means for
receiving, from a base station, an indication of the TA adjustment
value for the TA adjustment procedure based on the information
associated with the TA adjustment procedure. In some examples, to
support TA adjustment scheme, the TA component 825 may be
configured as or otherwise support a means for performing the TA
adjustment procedure using the indicated TA adjustment value.
[0167] In some examples, the first message includes a capability
for the UE to support one or more TA adjustment schemes of the set
of multiple TA adjustment schemes, one or more environmental
conditions associated with the UE, or both.
[0168] FIG. 9 shows a diagram of a system 900 including a device
905 that supports dynamic TA adjustment schemes in accordance with
aspects of the present disclosure. The device 905 may be an example
of or include the components of a device 605, a device 705, or a UE
115 as described herein. The device 905 may communicate wirelessly
with one or more base stations 105, UEs 115, or any combination
thereof. The device 905 may include components for bi-directional
voice and data communications including components for transmitting
and receiving communications, such as a communications manager 920,
an input/output (I/O) controller 910, a transceiver 915, an antenna
925, a memory 930, code 935, and a processor 940. These components
may be in electronic communication or otherwise coupled (e.g.,
operatively, communicatively, functionally, electronically,
electrically) via one or more buses (e.g., a bus 945).
[0169] The I/O controller 910 may manage input and output signals
for the device 905. The I/O controller 910 may also manage
peripherals not integrated into the device 905. In some cases, the
I/O controller 910 may represent a physical connection or port to
an external peripheral. In some cases, the I/O controller 910 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. Additionally or alternatively, the
I/O controller 910 may represent or interact with a modem, a
keyboard, a mouse, a touchscreen, or a similar device. In some
cases, the I/O controller 910 may be implemented as part of a
processor, such as the processor 940. In some cases, a user may
interact with the device 905 via the I/O controller 910 or via
hardware components controlled by the I/O controller 910.
[0170] In some cases, the device 905 may include a single antenna
925. However, in some other cases, the device 905 may have more
than one antenna 925, which may be capable of concurrently
transmitting or receiving multiple wireless transmissions. The
transceiver 915 may communicate bi-directionally, via the one or
more antennas 925, wired, or wireless links as described herein.
For example, the transceiver 915 may represent a wireless
transceiver and may communicate bi-directionally with another
wireless transceiver. The transceiver 915 may also include a modem
to modulate the packets, to provide the modulated packets to one or
more antennas 925 for transmission, and to demodulate packets
received from the one or more antennas 925. The transceiver 915, or
the transceiver 915 and one or more antennas 925, may be an example
of a transmitter 615, a transmitter 715, a receiver 610, a receiver
710, or any combination thereof or component thereof, as described
herein.
[0171] The memory 930 may include random access memory (RAM) and
read-only memory (ROM). The memory 930 may store computer-readable,
computer-executable code 935 including instructions that, when
executed by the processor 940, cause the device 905 to perform
various functions described herein. The code 935 may be stored in a
non-transitory computer-readable medium such as system memory or
another type of memory. In some cases, the code 935 may not be
directly executable by the processor 940 but may cause a computer
(e.g., when compiled and executed) to perform functions described
herein. In some cases, the memory 930 may contain, among other
things, a basic I/O system (BIOS) which may control basic hardware
or software operation such as the interaction with peripheral
components or devices.
[0172] The processor 940 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 940 may be configured to operate a memory array using a
memory controller. In some other cases, a memory controller may be
integrated into the processor 940. The processor 940 may be
configured to execute computer-readable instructions stored in a
memory (e.g., the memory 930) to cause the device 905 to perform
various functions (e.g., functions or tasks supporting dynamic TA
adjustment schemes). For example, the device 905 or a component of
the device 905 may include a processor 940 and memory 930 coupled
to the processor 940, the processor 940 and memory 930 configured
to perform various functions described herein.
[0173] The communications manager 920 may support wireless
communications at a UE in accordance with examples as disclosed
herein. For example, the communications manager 920 may be
configured as or otherwise support a means for transmitting a first
message including information associated with a TA adjustment
procedure at the UE, where the information includes at least one of
a UE capability or mobility mode of the UE. The communications
manager 920 may be configured as or otherwise support a means for
receiving a second message configuring the UE with a TA adjustment
scheme that is from a set of multiple TA adjustment schemes, the TA
adjustment scheme being based on the first message. The
communications manager 920 may be configured as or otherwise
support a means for transmitting an uplink message based on
performing the TA adjustment procedure, where the TA adjustment
procedure includes applying a TA adjustment value to the uplink
message in accordance with the TA adjustment scheme.
[0174] By including or configuring the communications manager 920
in accordance with examples as described herein, the device 905 may
support techniques for improved user experience related to reduced
processing, reduced power consumption, more efficient utilization
of communication resources, improved coordination between devices,
longer battery life, improved utilization of processing capability
based on the base station 105 selecting a TA adjustment scheme for
adjusting a TA value at the UE 115.
[0175] In some examples, the communications manager 920 may be
configured to perform various operations (e.g., receiving,
monitoring, transmitting) using or otherwise in cooperation with
the transceiver 915, the one or more antennas 925, or any
combination thereof. Although the communications manager 920 is
illustrated as a separate component, in some examples, one or more
functions described with reference to the communications manager
920 may be supported by or performed by the processor 940, the
memory 930, the code 935, or any combination thereof. For example,
the code 935 may include instructions executable by the processor
940 to cause the device 905 to perform various aspects of dynamic
TA adjustment schemes as described herein, or the processor 940 and
the memory 930 may be otherwise configured to perform or support
such operations.
[0176] FIG. 10 shows a block diagram 1000 of a device 1005 that
supports dynamic TA adjustment schemes in accordance with aspects
of the present disclosure. The device 1005 may be an example of
aspects of a base station 105 as described herein. The device 1005
may include a receiver 1010, a transmitter 1015, and a
communications manager 1020. The device 1005 may also include a
processor. Each of these components may be in communication with
one another (e.g., via one or more buses).
[0177] The receiver 1010 may provide a means for receiving
information such as packets, user data, control information, or any
combination thereof associated with various information channels
(e.g., control channels, data channels, information channels
related to dynamic TA adjustment schemes). Information may be
passed on to other components of the device 1005. The receiver 1010
may utilize a single antenna or a set of multiple antennas.
[0178] The transmitter 1015 may provide a means for transmitting
signals generated by other components of the device 1005. For
example, the transmitter 1015 may transmit information such as
packets, user data, control information, or any combination thereof
associated with various information channels (e.g., control
channels, data channels, information channels related to dynamic TA
adjustment schemes). In some examples, the transmitter 1015 may be
co-located with a receiver 1010 in a transceiver module. The
transmitter 1015 may utilize a single antenna or a set of multiple
antennas.
[0179] The communications manager 1020, the receiver 1010, the
transmitter 1015, or various combinations thereof or various
components thereof may be examples of means for performing various
aspects of dynamic TA adjustment schemes as described herein. For
example, the communications manager 1020, the receiver 1010, the
transmitter 1015, or various combinations or components thereof may
support a method for performing one or more of the functions
described herein.
[0180] In some examples, the communications manager 1020, the
receiver 1010, the transmitter 1015, or various combinations or
components thereof may be implemented in hardware (e.g., in
communications management circuitry). The hardware may include a
processor, a DSP, an ASIC, an FPGA or other programmable logic
device, a discrete gate or transistor logic, discrete hardware
components, or any combination thereof configured as or otherwise
supporting a means for performing the functions described in the
present disclosure. In some examples, a processor and memory
coupled with the processor may be configured to perform one or more
of the functions described herein (e.g., by executing, by the
processor, instructions stored in the memory).
[0181] Additionally or alternatively, in some examples, the
communications manager 1020, the receiver 1010, the transmitter
1015, or various combinations or components thereof may be
implemented in code (e.g., as communications management software or
firmware) executed by a processor. If implemented in code executed
by a processor, the functions of the communications manager 1020,
the receiver 1010, the transmitter 1015, or various combinations or
components thereof may be performed by a general-purpose processor,
a DSP, a CPU, an ASIC, an FPGA, or any combination of these or
other programmable logic devices (e.g., configured as or otherwise
supporting a means for performing the functions described in the
present disclosure).
[0182] In some examples, the communications manager 1020 may be
configured to perform various operations (e.g., receiving,
monitoring, transmitting) using or otherwise in cooperation with
the receiver 1010, the transmitter 1015, or both. For example, the
communications manager 1020 may receive information from the
receiver 1010, send information to the transmitter 1015, or be
integrated in combination with the receiver 1010, the transmitter
1015, or both to receive information, transmit information, or
perform various other operations as described herein.
[0183] The communications manager 1020 may support wireless
communications at a base station in accordance with examples as
disclosed herein. For example, the communications manager 1020 may
be configured as or otherwise support a means for receiving, from a
UE, a first message including information associated with a TA
adjustment procedure at the UE, where the information includes at
least one of a UE capability or mobility mode of the UE. The
communications manager 1020 may be configured as or otherwise
support a means for selecting a TA adjustment scheme from a set of
multiple TA adjustment schemes, where the TA adjustment scheme is
selected based on the first message. The communications manager
1020 may be configured as or otherwise support a means for
transmitting a second message configuring the UE with the selected
TA adjustment scheme. The communications manager 1020 may be
configured as or otherwise support a means for receiving an uplink
message from the UE in accordance with the selected TA adjustment
scheme.
[0184] By including or configuring the communications manager 1020
in accordance with examples as described herein, the device 1005
(e.g., a processor controlling or otherwise coupled to the receiver
1010, the transmitter 1015, the communications manager 1020, or a
combination thereof) may support techniques for reduced processing,
reduced power consumption, more efficient utilization of
communication resources based on the base station 105 selecting a
TA adjustment scheme for adjusting a TA value at the UE 115.
[0185] FIG. 11 shows a block diagram 1100 of a device 1105 that
supports dynamic TA adjustment schemes in accordance with aspects
of the present disclosure. The device 1105 may be an example of
aspects of a device 1005 or a base station 105 as described herein.
The device 1105 may include a receiver 1110, a transmitter 1115,
and a communications manager 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).
[0186] The receiver 1110 may provide a means for receiving
information such as packets, user data, control information, or any
combination thereof associated with various information channels
(e.g., control channels, data channels, information channels
related to dynamic TA adjustment schemes). Information may be
passed on to other components of the device 1105. The receiver 1110
may utilize a single antenna or a set of multiple antennas.
[0187] The transmitter 1115 may provide a means for transmitting
signals generated by other components of the device 1105. For
example, the transmitter 1115 may transmit information such as
packets, user data, control information, or any combination thereof
associated with various information channels (e.g., control
channels, data channels, information channels related to dynamic TA
adjustment schemes). In some examples, the transmitter 1115 may be
co-located with a receiver 1110 in a transceiver module. The
transmitter 1115 may utilize a single antenna or a set of multiple
antennas.
[0188] The device 1105, or various components thereof, may be an
example of means for performing various aspects of dynamic TA
adjustment schemes as described herein. For example, the
communications manager 1120 may include a TA component 1125, a TA
scheme component 1130, an uplink component 1135, or any combination
thereof. The communications manager 1120 may be an example of
aspects of a communications manager 1020 as described herein. In
some examples, the communications manager 1120, or various
components thereof, may be configured to perform various operations
(e.g., receiving, monitoring, transmitting) using or otherwise in
cooperation with the receiver 1110, the transmitter 1115, or both.
For example, the communications manager 1120 may receive
information from the receiver 1110, send information to the
transmitter 1115, or be integrated in combination with the receiver
1110, the transmitter 1115, or both to receive information,
transmit information, or perform various other operations as
described herein.
[0189] The communications manager 1120 may support wireless
communications at a base station in accordance with examples as
disclosed herein. The TA component 1125 may be configured as or
otherwise support a means for receiving, from a UE, a first message
including information associated with a TA adjustment procedure at
the UE, where the information includes at least one of a UE
capability or mobility mode of the UE. The TA scheme component 1130
may be configured as or otherwise support a means for selecting a
TA adjustment scheme from a set of multiple TA adjustment schemes,
where the TA adjustment scheme is selected based on the first
message. The TA scheme component 1130 may be configured as or
otherwise support a means for transmitting a second message
configuring the UE with the selected TA adjustment scheme. The
uplink component 1135 may be configured as or otherwise support a
means for receiving an uplink message from the UE in accordance
with the selected TA adjustment scheme.
[0190] FIG. 12 shows a block diagram 1200 of a communications
manager 1220 that supports dynamic TA adjustment schemes in
accordance with aspects of the present disclosure. The
communications manager 1220 may be an example of aspects of a
communications manager 1020, a communications manager 1120, or
both, as described herein. The communications manager 1220, or
various components thereof, may be an example of means for
performing various aspects of dynamic TA adjustment schemes as
described herein. For example, the communications manager 1220 may
include a TA component 1225, a TA scheme component 1230, an uplink
component 1235, a feedback component 1240, or any combination
thereof. Each of these components may communicate, directly or
indirectly, with one another (e.g., via one or more buses).
[0191] The communications manager 1220 may support wireless
communications at a base station in accordance with examples as
disclosed herein. The TA component 1225 may be configured as or
otherwise support a means for receiving, from a UE, a first message
including information associated with a TA adjustment procedure at
the UE, where the information includes at least one of a UE
capability or mobility mode of the UE. The TA scheme component 1230
may be configured as or otherwise support a means for selecting a
TA adjustment scheme from a set of multiple TA adjustment schemes,
where the TA adjustment scheme is selected based on the first
message. In some examples, the TA scheme component 1230 may be
configured as or otherwise support a means for transmitting a
second message configuring the UE with the selected TA adjustment
scheme. The uplink component 1235 may be configured as or otherwise
support a means for receiving an uplink message from the UE in
accordance with the selected TA adjustment scheme.
[0192] In some examples, to support TA adjustment scheme, the TA
component 1225 may be configured as or otherwise support a means
for receiving, from the UE, an indication of a TA adjustment value
determined at the UE. In some examples, the indication is received
based on the UE performing the TA adjustment procedure.
[0193] In some examples, the TA component 1225 may be configured as
or otherwise support a means for transmitting, to the UE, a third
message configuring the indicated TA adjustment value. In some
examples, the TA component 1225 may be configured as or otherwise
support a means for transmitting, to the UE, a configuration of a
second TA adjustment value, where the indication of the second TA
adjustment value is transmitted before receiving the indication of
the TA adjustment value.
[0194] In some examples, the feedback component 1240 may be
configured as or otherwise support a means for transmitting, to the
UE and during a duration after receiving the indication of the
determined TA adjustment value, a feedback message including
feedback information. In some examples, the feedback message
indicates a second TA adjustment value.
[0195] In some examples, the TA component 1225 may be configured as
or otherwise support a means for receiving, from the UE, an
additional indication of the determined TA adjustment value.
[0196] In some examples, the determined TA adjustment value is
indicated per beam, per antenna panel, per TRP, per beam group, per
TA group, or any combination thereof. In some examples, the TA
adjustment scheme is configured for one or more transmit beams
corresponding to the beam, the antenna panel, the TRP, the beam
group, the TA group, or any combination thereof.
[0197] In some examples, the TA component 1225 may be configured as
or otherwise support a means for transmitting, to the UE, a
downlink control channel order for performing a random access
procedure. In some examples, to support TA adjustment scheme, the
TA component 1225 may be configured as or otherwise support a means
for transmitting, to the UE, an indication of a TA adjustment value
for the TA adjustment procedure based on the information associated
with the TA adjustment procedure.
[0198] FIG. 13 shows a diagram of a system 1300 including a device
1305 that supports dynamic TA adjustment schemes in accordance with
aspects of the present disclosure. The device 1305 may be an
example of or include the components of a device 1005, a device
1105, or a base station 105 as described herein. The device 1305
may communicate wirelessly with one or more base stations 105, UEs
115, or any combination thereof. The device 1305 may include
components for bi-directional voice and data communications
including components for transmitting and receiving communications,
such as a communications manager 1320, a network communications
manager 1310, a transceiver 1315, an antenna 1325, a memory 1330,
code 1335, a processor 1340, and an inter-station communications
manager 1345. These components may be in electronic communication
or otherwise coupled (e.g., operatively, communicatively,
functionally, electronically, electrically) via one or more buses
(e.g., a bus 1350).
[0199] The network communications manager 1310 may manage
communications with a core network 130 (e.g., via one or more wired
backhaul links). For example, the network communications manager
1310 may manage the transfer of data communications for client
devices, such as one or more UEs 115.
[0200] In some cases, the device 1305 may include a single antenna
1325. However, in some other cases the device 1305 may have more
than one antenna 1325, which may be capable of concurrently
transmitting or receiving multiple wireless transmissions. The
transceiver 1315 may communicate bi-directionally, via the one or
more antennas 1325, wired, or wireless links as described herein.
For example, the transceiver 1315 may represent a wireless
transceiver and may communicate bi-directionally with another
wireless transceiver. The transceiver 1315 may also include a modem
to modulate the packets, to provide the modulated packets to one or
more antennas 1325 for transmission, and to demodulate packets
received from the one or more antennas 1325. The transceiver 1315,
or the transceiver 1315 and one or more antennas 1325, may be an
example of a transmitter 1015, a transmitter 1115, a receiver 1010,
a receiver 1110, or any combination thereof or component thereof,
as described herein.
[0201] The memory 1330 may include RAM and ROM. The memory 1330 may
store computer-readable, computer-executable code 1335 including
instructions that, when executed by the processor 1340, cause the
device 1305 to perform various functions described herein. The code
1335 may be stored in a non-transitory computer-readable medium
such as system memory or another type of memory. In some cases, the
code 1335 may not be directly executable by the processor 1340 but
may cause a computer (e.g., when compiled and executed) to perform
functions described herein. In some cases, the memory 1330 may
contain, among other things, a BIOS which may control basic
hardware or software operation such as the interaction with
peripheral components or devices.
[0202] The processor 1340 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 1340 may be configured to operate a memory array using a
memory controller. In some other cases, a memory controller may be
integrated into the processor 1340. The processor 1340 may be
configured to execute computer-readable instructions stored in a
memory (e.g., the memory 1330) to cause the device 1305 to perform
various functions (e.g., functions or tasks supporting dynamic TA
adjustment schemes). For example, the device 1305 or a component of
the device 1305 may include a processor 1340 and memory 1330
coupled to the processor 1340, the processor 1340 and memory 1330
configured to perform various functions described herein.
[0203] The inter-station communications manager 1345 may manage
communications with other base stations 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 1345 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 1345 may provide
an X2 interface within an LTE/LTE-A wireless communications network
technology to provide communication between base stations 105.
[0204] The communications manager 1320 may support wireless
communications at a base station in accordance with examples as
disclosed herein. For example, the communications manager 1320 may
be configured as or otherwise support a means for receiving, from a
UE, a first message including information associated with a TA
adjustment procedure at the UE, where the information includes at
least one of a UE capability or mobility mode of the UE. The
communications manager 1320 may be configured as or otherwise
support a means for selecting a TA adjustment scheme from a set of
multiple TA adjustment schemes, where the TA adjustment scheme is
selected based on the first message. The communications manager
1320 may be configured as or otherwise support a means for
transmitting a second message configuring the UE with the selected
TA adjustment scheme. The communications manager 1320 may be
configured as or otherwise support a means for receiving an uplink
message from the UE in accordance with the selected TA adjustment
scheme.
[0205] By including or configuring the communications manager 1320
in accordance with examples as described herein, the device 1305
may support techniques for improved user experience related to
reduced processing, reduced power consumption, more efficient
utilization of communication resources, improved coordination
between devices, longer battery life, improved utilization of
processing capability based on the base station 105 selecting a TA
adjustment scheme for adjusting a TA value at the UE 115.
[0206] In some examples, the communications manager 1320 may be
configured to perform various operations (e.g., receiving,
monitoring, transmitting) using or otherwise in cooperation with
the transceiver 1315, the one or more antennas 1325, or any
combination thereof. Although the communications manager 1320 is
illustrated as a separate component, in some examples, one or more
functions described with reference to the communications manager
1320 may be supported by or performed by the processor 1340, the
memory 1330, the code 1335, or any combination thereof. For
example, the code 1335 may include instructions executable by the
processor 1340 to cause the device 1305 to perform various aspects
of dynamic TA adjustment schemes as described herein, or the
processor 1340 and the memory 1330 may be otherwise configured to
perform or support such operations.
[0207] FIG. 14 shows a flowchart illustrating a method 1400 that
supports dynamic TA adjustment schemes in accordance with aspects
of the present disclosure. The operations of the method 1400 may be
implemented by a UE or its components as described herein. For
example, the operations of the method 1400 may be performed by a UE
115 as described with reference to FIGS. 1 through 9. In some
examples, a UE may execute a set of instructions to control the
functional elements of the UE to perform the described functions.
Additionally or alternatively, the UE may perform aspects of the
described functions using special-purpose hardware.
[0208] At 1405, the method may include transmitting a first message
including information associated with a TA adjustment procedure at
the UE, where the information includes at least one of a UE
capability or mobility mode of the UE. The operations of 1405 may
be performed in accordance with examples as disclosed herein. In
some examples, aspects of the operations of 1405 may be performed
by a TA component 825 as described with reference to FIG. 8.
[0209] At 1410, the method may include receiving a second message
configuring the UE with a TA adjustment scheme that is from a set
of multiple TA adjustment schemes, the TA adjustment scheme being
based on the first message. The operations of 1410 may be performed
in accordance with examples as disclosed herein. In some examples,
aspects of the operations of 1410 may be performed by a TA scheme
component 830 as described with reference to FIG. 8.
[0210] At 1415, the method may include transmitting an uplink
message based on performing the TA adjustment procedure, where the
TA adjustment procedure includes applying a TA adjustment value to
the uplink message in accordance with the TA adjustment scheme. The
operations of 1415 may be performed in accordance with examples as
disclosed herein. In some examples, aspects of the operations of
1415 may be performed by an uplink component 835 as described with
reference to FIG. 8.
[0211] FIG. 15 shows a flowchart illustrating a method 1500 that
supports dynamic TA adjustment schemes in accordance with aspects
of the present disclosure. The operations of the method 1500 may be
implemented by a UE or its components as described herein. For
example, the operations of the method 1500 may be performed by a UE
115 as described with reference to FIGS. 1 through 9. In some
examples, a UE may execute a set of instructions to control the
functional elements of the UE to perform the described functions.
Additionally or alternatively, the UE may perform aspects of the
described functions using special-purpose hardware.
[0212] At 1505, the method may include transmitting a first message
including information associated with a TA adjustment procedure at
the UE, where the information includes at least one of a UE
capability or mobility mode of the UE. The operations of 1505 may
be performed in accordance with examples as disclosed herein. In
some examples, aspects of the operations of 1505 may be performed
by a TA component 825 as described with reference to FIG. 8.
[0213] At 1510, the method may include receiving a second message
configuring the UE with a TA adjustment scheme that is from a set
of multiple TA adjustment schemes, the TA adjustment scheme being
based on the first message. The operations of 1510 may be performed
in accordance with examples as disclosed herein. In some examples,
aspects of the operations of 1510 may be performed by a TA scheme
component 830 as described with reference to FIG. 8.
[0214] At 1515, the method may include determining the TA
adjustment value based on the information associated with the TA
adjustment procedure. The operations of 1515 may be performed in
accordance with examples as disclosed herein. In some examples,
aspects of the operations of 1515 may be performed by a TA
component 825 as described with reference to FIG. 8.
[0215] At 1520, the method may include performing the TA adjustment
procedure using the determined TA adjustment value. The operations
of 1520 may be performed in accordance with examples as disclosed
herein. In some examples, aspects of the operations of 1520 may be
performed by a TA component 825 as described with reference to FIG.
8.
[0216] At 1525, the method may include transmitting an uplink
message based on performing the TA adjustment procedure, where the
TA adjustment procedure includes applying a TA adjustment value to
the uplink message in accordance with the TA adjustment scheme. The
operations of 1525 may be performed in accordance with examples as
disclosed herein. In some examples, aspects of the operations of
1525 may be performed by an uplink component 835 as described with
reference to FIG. 8.
[0217] FIG. 16 shows a flowchart illustrating a method 1600 that
supports dynamic TA adjustment schemes in accordance with aspects
of the present disclosure. The operations of the method 1600 may be
implemented by a base station or its components as described
herein. For example, the operations of the method 1600 may be
performed by a base station 105 as described with reference to
FIGS. 1 through 5 and 10 through 13. In some examples, a base
station may execute a set of instructions to control the functional
elements of the base station to perform the described functions.
Additionally or alternatively, the base station may perform aspects
of the described functions using special-purpose hardware.
[0218] At 1605, the method may include receiving, from a UE, a
first message including information associated with a TA adjustment
procedure at the UE, where the information includes at least one of
a UE capability or mobility mode of the UE. The operations of 1605
may be performed in accordance with examples as disclosed herein.
In some examples, aspects of the operations of 1605 may be
performed by a TA component 1225 as described with reference to
FIG. 12.
[0219] At 1610, the method may include selecting a TA adjustment
scheme from a set of multiple TA adjustment schemes, where the TA
adjustment scheme is selected based on the first message. The
operations of 1610 may be performed in accordance with examples as
disclosed herein. In some examples, aspects of the operations of
1610 may be performed by a TA scheme component 1230 as described
with reference to FIG. 12.
[0220] At 1615, the method may include transmitting a second
message configuring the UE with the selected TA adjustment scheme.
The operations of 1615 may be performed in accordance with examples
as disclosed herein. In some examples, aspects of the operations of
1615 may be performed by a TA scheme component 1230 as described
with reference to FIG. 12.
[0221] At 1620, the method may include receiving an uplink message
from the UE in accordance with the selected TA adjustment scheme.
The operations of 1620 may be performed in accordance with examples
as disclosed herein. In some examples, aspects of the operations of
1620 may be performed by an uplink component 1235 as described with
reference to FIG. 12.
[0222] FIG. 17 shows a flowchart illustrating a method 1700 that
supports dynamic TA adjustment schemes in accordance with aspects
of the present disclosure. The operations of the method 1700 may be
implemented by a base station or its components as described
herein. For example, the operations of the method 1700 may be
performed by a base station 105 as described with reference to
FIGS. 1 through 5 and 10 through 13. In some examples, a base
station may execute a set of instructions to control the functional
elements of the base station to perform the described functions.
Additionally or alternatively, the base station may perform aspects
of the described functions using special-purpose hardware.
[0223] At 1705, the method may include receiving, from a UE, a
first message including information associated with a TA adjustment
procedure at the UE, where the information includes at least one of
a UE capability or mobility mode of the UE. The operations of 1705
may be performed in accordance with examples as disclosed herein.
In some examples, aspects of the operations of 1705 may be
performed by a TA component 1225 as described with reference to
FIG. 12.
[0224] At 1710, the method may include selecting a TA adjustment
scheme from a set of multiple TA adjustment schemes, where the TA
adjustment scheme is selected based on the first message. The
operations of 1710 may be performed in accordance with examples as
disclosed herein. In some examples, aspects of the operations of
1710 may be performed by a TA scheme component 1230 as described
with reference to FIG. 12.
[0225] At 1715, the method may include transmitting a second
message configuring the UE with the selected TA adjustment scheme.
The operations of 1715 may be performed in accordance with examples
as disclosed herein. In some examples, aspects of the operations of
1715 may be performed by a TA scheme component 1230 as described
with reference to FIG. 12.
[0226] At 1720, the method may include receiving, from the UE, an
indication of a TA adjustment value determined at the UE. The
operations of 1720 may be performed in accordance with examples as
disclosed herein. In some examples, aspects of the operations of
1720 may be performed by a TA component 1225 as described with
reference to FIG. 12.
[0227] At 1725, the method may include receiving an uplink message
from the UE in accordance with the selected TA adjustment scheme.
The operations of 1725 may be performed in accordance with examples
as disclosed herein. In some examples, aspects of the operations of
1725 may be performed by an uplink component 1235 as described with
reference to FIG. 12.
[0228] The following provides an overview of aspects of the present
disclosure:
[0229] Aspect 1: A method for wireless communications at a UE,
comprising: transmitting a first message comprising information
associated with a timing advance adjustment procedure at the UE,
wherein the information comprises at least one of a UE capability
or mobility mode of the UE; receiving a second message configuring
the UE with a timing advance adjustment scheme that is from a
plurality of timing advance adjustment schemes, the timing advance
adjustment scheme being based at least in part on the first
message; and transmitting an uplink message based at least in part
on performing the timing advance adjustment procedure, wherein the
timing advance adjustment procedure comprises applying a timing
advance adjustment value to the uplink message in accordance with
the timing advance adjustment scheme.
[0230] Aspect 2: The method of aspect 1, wherein the timing advance
adjustment scheme comprises: determining the timing advance
adjustment value based at least in part on the information
associated with the timing advance adjustment procedure; and
performing the timing advance adjustment procedure using the
determined timing advance adjustment value.
[0231] Aspect 3: The method of aspect 2, wherein the timing advance
adjustment scheme further comprises: transmitting, to a base
station, an indication of the determined timing advance adjustment
value.
[0232] Aspect 4: The method of aspect 3, wherein the indication is
transmitted based at least in part on performing the timing advance
adjustment procedure.
[0233] Aspect 5: The method of any of aspects 3 through 4, further
comprising: receiving, from the base station, a third message
configuring the indicated timing advance adjustment value, wherein
the timing advance adjustment procedure is performed based at least
in part on receiving the third message configuring the indicated
timing advance adjustment value.
[0234] Aspect 6: The method of aspect 5, further comprising:
determining a second timing advance adjustment value based at least
in part on the information associated with the timing advance
adjustment procedure; and refraining from applying the second
timing advance adjustment value or transmitting an indication of
the second timing advance adjustment value for a duration based at
least in part on receiving the third message configuring the
indicated timing advance adjustment value.
[0235] Aspect 7: The method of any of aspects 3 through 6, further
comprising: receiving, from the base station, a configuration of a
second timing advance adjustment value, wherein the indication of
the second timing advance adjustment value is received after
transmitting the indication of the timing advance adjustment value;
and performing a second timing advance adjustment procedure using
the second timing advance adjustment value based at least in part
on the configuration of the second timing advance adjustment
value.
[0236] Aspect 8: The method of aspect 7, further comprising:
determining that the configuration of the second timing advance
adjustment value is received within a threshold time period after
transmitting the indication of the timing advance adjustment value,
wherein performing the second timing advance adjustment procedure
is based at least in part on the determination that the
configuration of the second timing advance adjustment value is
received within the threshold time period.
[0237] Aspect 9: The method of any of aspects 3 through 8, wherein
transmitting the indication of the determined timing advance
adjustment value comprises: transmitting the indication of the
determined timing advance adjustment value using uplink control
information over an uplink shared channel, uplink control
information over an uplink control channel, a MAC-CE, or any
combination thereof.
[0238] Aspect 10: The method of any of aspects 3 through 9, further
comprising: monitoring, for a duration after transmitting the
indication of the determined timing advance adjustment value, for a
feedback message from the base station; receiving, from the base
station and during the duration, the feedback message comprising
feedback information, wherein the timing advance adjustment
procedure is performed based at least in part on receiving the
feedback message.
[0239] Aspect 11: The method of aspect 10, wherein the feedback
message indicates a second timing advance adjustment value, the
method further comprising: performing a second timing advance
adjustment procedure using the second timing advance adjustment
value.
[0240] Aspect 12: The method of any of aspects 3 through 11,
further comprising: monitoring, for a duration after transmitting
the indication of the determined timing advance adjustment value,
for a feedback message from the base station; transmitting, to the
base station, an additional indication of the determined timing
advance adjustment value based at least in part on failing to
receive the feedback message during the duration.
[0241] Aspect 13: The method of any of aspects 3 through 12,
wherein the determined timing advance adjustment value is indicated
per beam, per antenna panel, per transmission reception point, per
beam group, per timing advance group, or any combination thereof
and the timing advance adjustment scheme is configured for one or
more transmit beams corresponding to the beam, the antenna panel,
the transmission reception point, the beam group, the timing
advance group, or any combination thereof.
[0242] Aspect 14: The method of any of aspects 2 through 13,
wherein determining the timing advance adjustment value comprises:
measuring one or more parameters associated with a plurality of
synchronization signal blocks, wherein the one or more parameters
comprise a reference signal receive power, a location of the UE, or
both; and calculating the timing advance adjustment value based at
least in part on the one or more parameters.
[0243] Aspect 15: The method of any of aspects 2 through 14,
further comprising: receiving, from a base station, a downlink
control channel order for performing a random access procedure; and
refraining from performing the timing advance adjustment procedure
using the determined timing advance adjustment value based at least
in part on the downlink control channel order being received within
a threshold time period of determining the timing advance
adjustment value.
[0244] Aspect 16: The method of any of aspects 1 through 15,
wherein the timing advance adjustment scheme comprises: receiving,
from a base station, an indication of the timing advance adjustment
value for the timing advance adjustment procedure based at least in
part on the information associated with the timing advance
adjustment procedure; and performing the timing advance adjustment
procedure using the indicated timing advance adjustment value.
[0245] Aspect 17: The method of any of aspects 1 through 16,
wherein the first message comprises a capability for the UE to
support one or more timing advance adjustment schemes of the
plurality of timing advance adjustment schemes, one or more
environmental conditions associated with the UE, or both.
[0246] Aspect 18: A method for wireless communications at a base
station, comprising: receiving, from a UE, a first message
comprising information associated with a timing advance adjustment
procedure at the UE, wherein the information comprises at least one
of a UE capability or mobility mode of the UE; selecting a timing
advance adjustment scheme from a plurality of timing advance
adjustment schemes, wherein the timing advance adjustment scheme is
selected based at least in part on the first message; transmitting
a second message configuring the UE with the selected timing
advance adjustment scheme; and receiving an uplink message from the
UE in accordance with the selected timing advance adjustment
scheme.
[0247] Aspect 19: The method of aspect 18, wherein the timing
advance adjustment scheme comprises: receiving, from the UE, an
indication of a timing advance adjustment value determined at the
UE.
[0248] Aspect 20: The method of aspect 19, wherein the indication
is received based at least in part on the UE performing the timing
advance adjustment procedure.
[0249] Aspect 21: The method of any of aspects 19 through 20,
further comprising: transmitting, to the UE, a third message
configuring the indicated timing advance adjustment value.
[0250] Aspect 22: The method of any of aspects 19 through 21,
further comprising: transmitting, to the UE, a configuration of a
second timing advance adjustment value, wherein the indication of
the second timing advance adjustment value is transmitted before
receiving the indication of the timing advance adjustment
value.
[0251] Aspect 23: The method of any of aspects 19 through 22,
further comprising: transmitting, to the UE and during a duration
after receiving the indication of the determined timing advance
adjustment value, a feedback message comprising feedback
information.
[0252] Aspect 24: The method of aspect 23, wherein the feedback
message indicates a second timing advance adjustment value.
[0253] Aspect 25: The method of any of aspects 19 through 24,
further comprising: receiving, from the UE, an additional
indication of the determined timing advance adjustment value.
[0254] Aspect 26: The method of any of aspects 19 through 25,
wherein the determined timing advance adjustment value is indicated
per beam, per antenna panel, per transmission reception point, per
beam group, per timing advance group, or any combination thereof
and the timing advance adjustment scheme is configured for one or
more transmit beams corresponding to the beam, the antenna panel,
the transmission reception point, the beam group, the timing
advance group, or any combination thereof.
[0255] Aspect 27: The method of any of aspects 18 through 26,
further comprising: transmitting, to the UE, a downlink control
channel order for performing a random access procedure.
[0256] Aspect 28: The method of any of aspects 18 through 27,
wherein the timing advance adjustment scheme comprises:
transmitting, to the UE, an indication of a timing advance
adjustment value for the timing advance adjustment procedure based
at least in part on the information associated with the timing
advance adjustment procedure.
[0257] Aspect 29: An apparatus for wireless communications at a 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 perform a method of any of aspects 1
through 17.
[0258] Aspect 30: An apparatus for wireless communications at a UE,
comprising at least one means for performing a method of any of
aspects 1 through 17.
[0259] Aspect 31: A non-transitory computer-readable medium storing
code for wireless communications at a UE, the code comprising
instructions executable by a processor to perform a method of any
of aspects 1 through 17.
[0260] Aspect 32: An apparatus for wireless communications at 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 perform a method of any of
aspects 18 through 28.
[0261] Aspect 33: An apparatus for wireless communications at a
base station, comprising at least one means for performing a method
of any of aspects 18 through 28.
[0262] Aspect 34: A non-transitory computer-readable medium storing
code for wireless communications at a base station, the code
comprising instructions executable by a processor to perform a
method of any of aspects 18 through 28.
[0263] 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.
[0264] Although 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 networks. For example, the described techniques may be
applicable to various other wireless communications systems such as
Ultra Mobile Broadband (UMB), Institute of Electrical and
Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX),
IEEE 802.20, Flash-OFDM, as well as other systems and radio
technologies not explicitly mentioned herein.
[0265] 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.
[0266] The various illustrative blocks and components described in
connection with the disclosure herein may be implemented or
performed with a general-purpose processor, a DSP, an ASIC, a CPU,
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 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).
[0267] 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 may 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.
[0268] 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 may be accessed by a general-purpose or special-purpose
computer. By way of example, and not limitation, non-transitory
computer-readable media may include RAM, 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 may be
used to carry or store desired program code means in the form of
instructions or data structures and that may 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 computer-readable
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.
[0269] 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 example
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."
[0270] 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.
[0271] 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 "example" 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, known structures and devices are shown in block diagram
form in order to avoid obscuring the concepts of the described
examples.
[0272] The description herein is provided to enable a person having
ordinary skill in the art to make or use the disclosure. Various
modifications to the disclosure will be apparent to a person having
ordinary skill 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.
* * * * *