U.S. patent application number 16/047764 was filed with the patent office on 2019-01-31 for power headroom report for lte-nr co-existence.
The applicant listed for this patent is QUALCOMM Incorporated. Invention is credited to Wanshi Chen, Peter Gaal, Seyedkianoush Hosseini, Yi Huang, Seyong Park, Renqiu Wang.
Application Number | 20190037560 16/047764 |
Document ID | / |
Family ID | 65038438 |
Filed Date | 2019-01-31 |
View All Diagrams
United States Patent
Application |
20190037560 |
Kind Code |
A1 |
Huang; Yi ; et al. |
January 31, 2019 |
POWER HEADROOM REPORT FOR LTE-NR CO-EXISTENCE
Abstract
Methods, systems, and devices for wireless communication are
described. Generally, the described techniques provide for a power
headroom report for multiple radio access technologies (RATs). A
user equipment (UE) may support multiple RATs that correspond to
different transmission time intervals (TTIs). A UE may determine a
reporting schedule for power headroom reports (PHRs) for a first
RAT and a second schedule for PHRs for a second RAT. The UE may
generate a PHR for the first RAT and a companion PHR for the second
RAT, and may transmit the PHR and companion PHR based at least in
part on the first PHR schedule. In some examples, the UE may
receive a PHR type from the base station, and may determine a joint
PHR based on the type. The UE may determine a joint PHR schedule
based on a granularity of supported RATs.
Inventors: |
Huang; Yi; (San Diego,
CA) ; Chen; Wanshi; (San Diego, CA) ;
Hosseini; Seyedkianoush; (San Diego, CA) ; Gaal;
Peter; (San Diego, CA) ; Wang; Renqiu; (San
Diego, CA) ; Park; Seyong; (San Diego, CA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
QUALCOMM Incorporated |
San Diego |
CA |
US |
|
|
Family ID: |
65038438 |
Appl. No.: |
16/047764 |
Filed: |
July 27, 2018 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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62539446 |
Jul 31, 2017 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04W 88/06 20130101;
H04W 52/325 20130101; H04W 24/10 20130101; H04W 72/048 20130101;
H04W 52/365 20130101; H04W 72/0446 20130101; H04W 72/1215 20130101;
H04W 52/367 20130101 |
International
Class: |
H04W 72/04 20060101
H04W072/04; H04W 52/36 20060101 H04W052/36; H04W 52/32 20060101
H04W052/32; H04W 72/12 20060101 H04W072/12 |
Claims
1. A method for wireless communication by a user equipment (UE) in
a system that supports a first radio access technology (RAT)
corresponding to a first transmission time interval (TTI) duration
and a second RAT corresponding to a second TTI duration that is
different than the first TTI duration, comprising: determining a
first power headroom reporting schedule for the first RAT, and a
second power headroom reporting schedule for the second RAT
different from the first power headroom reporting schedule;
generating a power headroom report (PHR) for the first RAT and a
companion PHR for the second RAT; and transmitting the PHR and the
companion PHR based at least in part on the first power headroom
reporting schedule.
2. The method of claim 1, further comprising: determining that a
first TTI of a plurality of TTIs includes a scheduled transmission
and that a second TTI of the plurality of TTIs does not include a
scheduled transmission; and determining power headroom for the
first TTI, wherein the companion PHR includes the determined power
headroom for the first TTI.
3. The method of claim 2, further comprising: determining virtual
power headroom for the second TTI, wherein the companion PHR
includes the virtual power headroom for the second TTI.
4. The method of claim 3, wherein determining the virtual power
headroom for the second TTI further comprises: determining the
virtual power headroom for the second TTI based on a number of
resource blocks.
5. The method of claim 1, wherein: the PHR for the first RAT and
the companion PHR for the second RAT are configured based at least
in part on a semi-static power split between the first RAT and the
second RAT.
6. The method of claim 1, wherein: a duration of a plurality of
TTIs of the second RAT corresponds to a duration of a single TTI of
the first RAT.
7. The method of claim 6, further comprising: determining that two
or more of the plurality of TTIs each include a scheduled
transmission.
8. The method of claim 7, further comprising: determining average
power headroom for the two or more of the plurality of TTIs,
wherein the companion PHR includes the average power headroom.
9. The method of claim 7, further comprising: identifying a
reference TTI in the two or more of the plurality of TTIs; and
determining power headroom for the reference TTI, wherein the
companion PHR includes the power headroom for the reference
TTI.
10. The method of claim 6, further comprising: determining power
headroom for each of the plurality of TTIs, wherein the companion
PHR includes the determined power headroom for the each of the
plurality of TTIs.
11. The method of claim 1, further comprising: generating a PHR for
the second RAT and a companion PHR for the first RAT; and
transmitting the PHR for the second RAT and the companion PHR for
the first RAT based at least in part on the second power headroom
reporting schedule.
12. The method of claim 1, wherein: the first RAT and the second
RAT communicate using different numerology.
13. The method of claim 1, wherein: at least one of the PHR or the
companion PHR is a virtual PHR.
14. The method of claim 1, wherein: at least one of the PHR or the
companion PHR includes a maximum transmission power of the UE.
15. The method of claim 1, wherein generating the PHR comprises:
determining power headroom as a function of a maximum transmission
power of the UE and an estimated transmission power, wherein the
estimated transmission power is a function of scheduled
transmission power in a control channel of the first RAT, or a
shared channel of the first RAT, or any combination thereof.
16. The method of claim 1, wherein generating the companion PHR
comprises: determining power headroom as a function of a maximum
transmission power of the UE and an estimated transmission power,
wherein the estimated transmission power is a function of scheduled
transmission power in a control channel of the second RAT, or a
shared channel of the second RAT, or any combination thereof.
17. A method for wireless communication by a user equipment (UE) in
a system that supports a first radio access technology (RAT)
corresponding to a first transmission time interval (TTI) duration
and a second RAT corresponding to a second TTI duration that is
different than the first TTI duration, comprising: receiving a
signal specifying a power headroom report (PHR) type, the PHR type
associated with at least one channel of the first RAT and at least
one channel of the second RAT; generating a joint PHR for the at
least one channel of the first RAT and the at least one channel of
the second RAT according to the PHR type; and transmitting the
joint PHR.
18. The method of claim 17, further comprising: determining a PHR
reporting timeline corresponding to a shorter of the first TTI
duration and the second TTI duration, wherein transmitting the
joint PHR is based at least in part on the determined PHR reporting
timeline.
19. The method of claim 17, wherein generating the joint PHR
further comprises: determining power headroom as a function of a
maximum transmission power of the UE and an estimated transmission
power, wherein the estimated transmission power is a function of
scheduled transmission power in a control channel of the first RAT,
or a shortened TTI of the first RAT, or a control channel of the
second RAT, or a shared channel of the first RAT, or a shared
channel of the second RAT, or any combination thereof.
20. The method of claim 17, wherein: the first RAT and the second
RAT communicate using different numerology.
21. The method of claim 17, wherein: the joint PHR includes a
maximum transmission power of the UE.
22. The method of claim 17, wherein: the first TTI duration or the
second TTI duration corresponds to a duration of a short TTI (sTTI)
or a mini-slot.
23. A method for wireless communication by a base station in a
system that supports a first radio access technology (RAT)
corresponding to a first transmission time interval (TTI) duration
and a second RAT corresponding to a second TTI duration that is
different than the first TTI duration, comprising: configuring a
user equipment (UE) with a first power headroom reporting schedule
for the first RAT and a second power headroom reporting schedule
for the second RAT; receiving a power headroom report (PHR) for the
first RAT and a companion PHR for the second RAT based at least in
part on the first power headroom reporting schedule; and allocating
resources to the UE based at least in part on the PHR for the first
RAT and the companion PHR for the second RAT.
24. The method of claim 23, further comprising: determining that a
first TTI of a plurality of TTIs includes a scheduled transmission
and that a second TTI of the plurality of TTIs does not include a
scheduled transmission; and receiving a companion PHR that includes
a power headroom for the first TTI.
25. The method of claim 24, wherein the companion PHR includes a
virtual power headroom for the second TTI.
26. The method of claim 25, wherein the virtual power headroom for
the second TTI is based on a number of resource blocks.
27. The method of claim 23, further comprising: adjusting a
bandwidth allocation based at least in part on the PHR for the
first RAT and the companion PHR for the second RAT.
28. The method of claim 23, further comprising: receiving a PHR for
the second RAT and a companion PHR for the first RAT based at least
in part on the second power headroom reporting schedule; and
determining whether to adjust the allocated resources based at
least in part on the PHR for the second RAT and the companion PHR
for the first RAT.
29. A method for wireless communication by a base station in a
system that supports a first radio access technology (RAT)
corresponding to a first transmission time interval (TTI) duration
and a second RAT corresponding to a second TTI duration that is
different than the first TTI duration, comprising: transmitting a
message specifying a power headroom report (PHR) type corresponding
to at least one channel of the first RAT and at least one channel
of the second RAT; receiving a joint PHR based at least in part on
the PHR type; and allocating resources to a user equipment based at
least in part on the joint PHR.
30. The method of claim 29, further comprising: transmitting a
second message specifying a second PHR type that differs from the
PHR type; receiving a second joint PHR based at least in part on
the second PHR type; and determining whether to adjust the
allocated resources based at least in part on the second joint PHR.
Description
CROSS REFERENCES
[0001] The present Application for Patent claims the benefit of
U.S. Provisional Patent Application No. 62/539,446 by HUANG, et
al., entitled "POWER HEADROOM REPORT FOR LTE-NR CO-EXISTENCE,"
filed Jul. 31, 2017, assigned to the assignee hereof, and expressly
incorporated herein.
BACKGROUND
[0002] The following relates generally to wireless communication,
and more specifically to power headroom reporting for LTE-NR
co-existence.
[0003] Wireless communications systems are widely deployed to
provide various types of communication content such as voice,
video, packet data, messaging, broadcast, and so on. These systems
may be capable of supporting communication with multiple users by
sharing the available system resources (e.g., time, frequency, and
power). Examples of such multiple-access systems include fourth
generation (4G) systems such as a Long Term Evolution (LTE) systems
or LTE-Advanced (LTE-A) 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-OFDM
(DFT-S-OFDM). A wireless multiple-access communications system may
include a number of base stations or network access nodes, each
simultaneously supporting communication for multiple communication
devices, which may be otherwise known as user equipment (UE).
[0004] In some wireless communications systems, a base station may
communicate with a UE. While communicating with one or more UEs,
the base station may determine whether to increase, decrease, or
maintain a bandwidth allocated to a particular UE. The base station
may utilize power headroom information to make this or other
determinations. In some examples, a UE may transmit a power
headroom report (PHR) to the base station. In some cases, one or
more UEs in a wireless communications system may support more than
one radio access technology (RAT). Different RATs may correspond to
different transmission time interval (TTI) durations, and therefore
may have different PHR reporting schedules.
SUMMARY
[0005] The described techniques relate to improved methods,
systems, devices, or apparatuses that support power headroom
reporting for long term evolution new radio (LTE-NR) co-existence.
Generally, the described techniques provide for a power headroom
report for multiple radio access technologies (RATs). In some
examples, a user equipment (UE) may support connectivity via
multiples RATs that operate using different transmission time
interval (TTI) durations. In the examples described herein, a UE
may send multiple power headroom reports (PHRs) or a joint PHR in
accordance with a PHR reporting schedule determined based on the
different TTI durations to enable a base station to improve
allocation of resources for the multiple RATs.
[0006] In some examples, a UE may semi-statically split
transmission power between multiple RATs. The UE may determine a
first reporting schedule for a PHR for a first RAT and a second
reporting schedule for a PHR for a second RAT. The UE may generate
a PHR for the first RAT and a companion PHR (CPHR) for the second
RAT, and may transmit the PHR and CPHR based on the first reporting
schedule. The UE may thus report power headroom information for the
second RAT based on the first reporting schedule for the first RAT,
even though the second reporting schedule for the second RAT
indicates that a PHR is not yet due. The UE may also generate a PHR
for the second RAT and a CPHR for the first RAT, and may transmit
the PHR for the second RAT and the CPHR based on the second PHR
schedule. The UE may thus report power headroom information for the
first RAT based on the second reporting schedule for the second
RAT, even though the first reporting schedule for the first RAT
indicates that a PHR is not yet due. Beneficially, the base station
may be informed of power headroom information for each RAT whenever
a UE is scheduled to send a PHR for any of the RATs, and the base
station may use the increased reporting of power headroom
information to improve allocation of resources for the multiple
RATs.
[0007] In some examples, the UE may perform joint power management
that dynamically divides transmission power between multiple RATs.
The base station may inform the UE of a PHR type that indicates on
which channels and/or RATs the UE is to calculate power headroom.
The UE may calculate a power headroom value based on the PHR type,
and transmit a joint PHR that includes the calculated power
headroom value. In some examples, the UE may determine a schedule
for sending the joint PHR to the base station based on a shortest
TTI granularity of the supported RATs. Beneficially, the base
station may be informed of joint power headroom information for the
RATs based on how transmission power is currently being jointly
managed for the multiple RATs, and the base station may use the
joint power headroom information to improve allocation of resources
for the multiple RATs.
[0008] A method of wireless communication by a UE in a system that
supports a first RAT corresponding to a first TTI duration and a
second RAT corresponding to a second TTI duration that is different
than the first TTI duration is described. The method may include
determining a first power headroom reporting schedule for the first
RAT, and a second power headroom reporting schedule for the second
RAT different from the first power headroom reporting schedule,
generating a PHR for the first RAT and a companion PHR for the
second RAT, and transmitting the PHR and the companion PHR based at
least in part on the first power headroom reporting schedule.
[0009] An apparatus for wireless communication by a UE in a system
that supports a first RAT corresponding to a first TTI duration and
a second RAT corresponding to a second TTI duration that is
different than the first TTI duration is described. The apparatus
may include means for determining a first power headroom reporting
schedule for the first RAT, and a second power headroom reporting
schedule for the second RAT different from the first power headroom
reporting schedule, means for generating a PHR for the first RAT
and a companion PHR for the second RAT, and means for transmitting
the PHR and the companion PHR based at least in part on the first
power headroom reporting schedule.
[0010] Another apparatus for wireless communication by a UE in a
system that supports a first RAT corresponding to a first TTI
duration and a second RAT corresponding to a second TTI duration
that is different than the first TTI duration 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 operable to cause the processor to
determine a first power headroom reporting schedule for the first
RAT, and a second power headroom reporting schedule for the second
RAT different from the first power headroom reporting schedule,
generate a PHR for the first RAT and a companion PHR for the second
RAT, and transmit the PHR and the companion PHR based at least in
part on the first power headroom reporting schedule.
[0011] A non-transitory computer readable medium for wireless
communication by a user equipment (UE) in a system that supports a
first RAT corresponding to a first TTI duration and a second RAT
corresponding to a second TTI duration that is different than the
first TTI duration is described. The non-transitory
computer-readable medium may include instructions operable to cause
a processor to determine a first power headroom reporting schedule
for the first RAT, and a second power headroom reporting schedule
for the second RAT different from the first power headroom
reporting schedule, generate a PHR for the first RAT and a
companion PHR for the second RAT, and transmit the PHR and the
companion PHR based at least in part on the first power headroom
reporting schedule.
[0012] In some examples of the method, apparatus, and
non-transitory computer-readable medium described above, a duration
of a plurality of TTIs of the second RAT corresponds to a duration
of a single TTI of the first RAT.
[0013] Some examples of the method, apparatus, and non-transitory
computer-readable medium described above may further include
processes, features, means, or instructions for determining that
two or more of the plurality of TTIs each include a scheduled
transmission.
[0014] Some examples of the method, apparatus, and non-transitory
computer-readable medium described above may further include
processes, features, means, or instructions for determining average
power headroom for the two or more of the plurality of TTIs,
wherein the companion PHR includes the average power headroom.
[0015] Some examples of the method, apparatus, and non-transitory
computer-readable medium described above may further include
processes, features, means, or instructions for identifying a
reference TTI in the two or more of the plurality of TTIs. Some
examples of the method, apparatus, and non-transitory
computer-readable medium described above may further include
processes, features, means, or instructions for determining power
headroom for the reference TTI, wherein the companion PHR includes
the power headroom for the reference TTI.
[0016] Some examples of the method, apparatus, and non-transitory
computer-readable medium described above may further include
processes, features, means, or instructions for determining power
headroom for each of the plurality of TTIs, wherein the companion
PHR includes the determined power headroom for the each of the
plurality of TTIs.
[0017] Some examples of the method, apparatus, and non-transitory
computer-readable medium described above may further include
processes, features, means, or instructions for determining that a
first TTI of the plurality of TTIs includes a scheduled
transmission and that a second TTI of the plurality of TTIs does
not include a scheduled transmission. Some examples of the method,
apparatus, and non-transitory computer-readable medium described
above may further include processes, features, means, or
instructions for determining power headroom for the first TTI,
wherein the companion PHR includes the determined power headroom
for the first TTI.
[0018] Some examples of the method, apparatus, and non-transitory
computer-readable medium described above may further include
processes, features, means, or instructions for determining virtual
power headroom for the second TTI, wherein the companion PHR
includes a virtual power headroom for the second TTI. In some
examples of the method, apparatus, and non-transitory
computer-readable medium described above, determining the virtual
power headroom for the second TTI may include determining the
virtual power headroom for the second TTI based on a number of
resource blocks.
[0019] In some examples of the method, apparatus, and
non-transitory computer-readable medium described above, generating
the PHR comprises: determining power headroom as a function of a
maximum transmission power of the UE and an estimated transmission
power, wherein the estimated transmission power may be a function
of scheduled transmission power in a control channel of the first
RAT, or a shared channel of the first RAT, or any combination
thereof.
[0020] In some examples of the method, apparatus, and
non-transitory computer-readable medium described above, generating
the companion PHR comprises: determining power headroom as a
function of a maximum transmission power of the UE and an estimated
transmission power, wherein the estimated transmission power may be
a function of scheduled transmission power in a control channel of
the second RAT, or a shared channel of the second RAT, or any
combination thereof.
[0021] Some examples of the method, apparatus, and non-transitory
computer-readable medium described above may further include
processes, features, means, or instructions for generating a PHR
for the second RAT and a companion PHR for the first RAT. Some
examples of the method, apparatus, and non-transitory
computer-readable medium described above may further include
processes, features, means, or instructions for transmitting the
PHR for the second RAT and the companion PHR for the first RAT
based at least in part on the second power headroom reporting
schedule.
[0022] In some examples of the method, apparatus, and
non-transitory computer-readable medium described above, the first
RAT and the second RAT communicate using different numerology.
[0023] In some examples of the method, apparatus, and
non-transitory computer-readable medium described above, at least
one of the PHR or the companion PHR may be a virtual PHR.
[0024] In some examples of the method, apparatus, and
non-transitory computer-readable medium described above, at least
one of the PHR or the companion PHR includes a maximum transmission
power of the UE.
[0025] In some examples of the method, apparatus, and
non-transitory computer-readable medium described above, the PHR
for the first RAT and the companion PHR for the second RAT may be
configured based at least in part on a semi-static power split
between the first RAT and the second RAT.
[0026] A method of wireless communication by a UE in a system that
supports a first RAT corresponding to a first TTI duration and a
second RAT corresponding to a second TTI duration that is different
than the first TTI duration is described. The method may include
receiving a signal specifying a PHR type, the PHR type associated
with at least one channel of the first RAT and at least one channel
of the second RAT, generating a joint PHR for the at least one
channel of the first RAT and the at least one channel of the second
RAT according to the PHR type, and transmitting the joint PHR.
[0027] An apparatus for wireless communication by a UE in a system
that supports a first RAT corresponding to a first TTI duration and
a second RAT corresponding to a second TTI duration that is
different than the first TTI duration is described. The apparatus
may include means for receiving a signal specifying a PHR type, the
PHR type associated with at least one channel of the first RAT and
at least one channel of the second RAT, means for generating a
joint PHR for the at least one channel of the first RAT and the at
least one channel of the second RAT according to the PHR type, and
means for transmitting the joint PHR.
[0028] Another apparatus for wireless communication by a UE in a
system that supports a first RAT corresponding to a first TTI
duration and a second RAT corresponding to a second TTI duration
that is different than the first TTI duration 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 operable to cause the processor to
receive a signal specifying a PHR type, the PHR type associated
with at least one channel of the first RAT and at least one channel
of the second RAT, generate a joint PHR for the at least one
channel of the first RAT and the at least one channel of the second
RAT according to the PHR type, and transmit the joint PHR.
[0029] A non-transitory computer readable medium for wireless
communication by a UE in a system that supports a first RAT
corresponding to a first TTI duration and a second RAT
corresponding to a second TTI duration that is different than the
first TTI duration is described. The non-transitory
computer-readable medium may include instructions operable to cause
a processor to receive a signal specifying a PHR type, the PHR type
associated with at least one channel of the first RAT and at least
one channel of the second RAT, generate a joint PHR for the at
least one channel of the first RAT and the at least one channel of
the second RAT according to the PHR type, and transmit the joint
PHR.
[0030] Some examples of the method, apparatus, and non-transitory
computer-readable medium described above may further include
processes, features, means, or instructions for determining a PHR
reporting timeline corresponding to a shorter of the first TTI
duration and the second TTI duration, wherein transmitting the
joint PHR may be based at least in part on the determined PHR
reporting timeline.
[0031] In some examples of the method, apparatus, and
non-transitory computer-readable medium described above, generating
the joint PHR further comprises: determining power headroom as a
function of a maximum transmission power of the UE and an estimated
transmission power, wherein the estimated transmission power may be
a function of scheduled transmission power in a control channel of
the first RAT, or a shortened TTI of the first RAT, or a control
channel of the second RAT, or a shared channel of the first RAT, or
a shared channel of the second RAT, or any combination thereof.
[0032] In some examples of the method, apparatus, and
non-transitory computer-readable medium described above, the first
RAT and the second RAT communicate using different numerology.
[0033] In some examples of the method, apparatus, and
non-transitory computer-readable medium described above, the joint
PHR includes a maximum transmission power of the UE.
[0034] In some examples of the method, apparatus, and
non-transitory computer-readable medium described above, the first
TTI duration or the second TTI duration corresponds to a duration
of a short TTI (sTTI) or a mini-slot.
[0035] A method of wireless communication by a base station in a
system that supports a first RAT corresponding to a first TTI
duration and a second RAT corresponding to a second TTI duration
that is different than the first TTI duration is described. The
method may include configuring a UE with a first power headroom
reporting schedule for the first RAT and a second power headroom
reporting schedule for the second RAT, receiving a PHR for the
first RAT and a companion PHR for the second RAT based at least in
part on the first power headroom reporting schedule, and allocating
resources to the UE based at least in part on the PHR for the first
RAT and the companion PHR for the second RAT.
[0036] An apparatus for wireless communication by a base station in
a system that supports a first RAT corresponding to a first TTI
duration and a second RAT corresponding to a second TTI duration
that is different than the first TTI duration is described. The
apparatus may include means for configuring a UE with a first power
headroom reporting schedule for the first RAT and a second power
headroom reporting schedule for the second RAT, means for receiving
a PHR for the first RAT and a companion PHR for the second RAT
based at least in part on the first power headroom reporting
schedule, and means for allocating resources to the UE based at
least in part on the PHR for the first RAT and the companion PHR
for the second RAT.
[0037] Another apparatus for wireless communication by a base
station in a system that supports a first RAT corresponding to a
first TTI duration and a second RAT corresponding to a second TTI
duration that is different than the first TTI duration 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 operable to cause the
processor to configure a UE with a first power headroom reporting
schedule for the first RAT and a second power headroom reporting
schedule for the second RAT, receive a PHR for the first RAT and a
companion PHR for the second RAT based at least in part on the
first power headroom reporting schedule, and allocate resources to
a UE based at least in part on the PHR for the first RAT and the
companion PHR for the second RAT.
[0038] A non-transitory computer readable medium for wireless
communication by a base station in a system that supports a first
RAT corresponding to a first TTI duration and a second RAT
corresponding to a second TTI duration that is different than the
first TTI duration is described. The non-transitory
computer-readable medium may include instructions operable to cause
a processor to configure a UE with a first power headroom reporting
schedule for the first RAT and a second power headroom reporting
schedule for the second RAT, receive a PHR for the first RAT and a
companion PHR for the second RAT based at least in part on the
first power headroom reporting schedule, and allocate resources to
a UE based at least in part on the PHR for the first RAT and the
companion PHR for the second RAT.
[0039] Some examples of the method, apparatus, and non-transitory
computer-readable medium described above may further include
processes, features, means, or instructions for adjusting a
bandwidth allocation based at least in part on the PHR for the
first RAT and the companion PHR for the second RAT.
[0040] Some examples of the method, apparatus, and non-transitory
computer-readable medium described above may further include
processes, features, means, or instructions for receiving a PHR for
the second RAT and a companion PHR for the first RAT based at least
in part on the second power headroom reporting schedule. Some
examples of the method, apparatus, and non-transitory
computer-readable medium described above may further include
processes, features, means, or instructions for determining whether
to adjust the allocated resources based at least in part on the PHR
for the second RAT and the companion PHR for the first RAT.
[0041] A method of wireless communication by a base station in a
system that supports a first RAT corresponding to a first TTI
duration and a second RAT corresponding to a second TTI duration
that is different than the first TTI duration is described. The
method may include transmitting a message specifying a PHR type
corresponding to at least one channel of the first RAT and at least
one channel of the second RAT, receiving a joint PHR based at least
in part on the PHR type, and allocating resources to a UE based at
least in part on the joint PHR.
[0042] An apparatus for wireless communication by a base station in
a system that supports a first RAT corresponding to a first TTI
duration and a second RAT corresponding to a second TTI duration
that is different than the first TTI duration is described. The
apparatus may include means for transmitting a message specifying a
PHR type corresponding to at least one channel of the first RAT and
at least one channel of the second RAT, means for receiving a joint
PHR based at least in part on the PHR type, and means for
allocating resources to a UE based at least in part on the joint
PHR.
[0043] Another apparatus for wireless communication by a base
station in a system that supports a first RAT corresponding to a
first TTI duration and a second RAT corresponding to a second TTI
duration that is different than the first TTI duration 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 operable to cause the
processor to transmit a message specifying a PHR type corresponding
to at least one channel of the first RAT and at least one channel
of the second RAT, receive a joint PHR based at least in part on
the PHR type, and allocate resources to a UE based at least in part
on the joint PHR.
[0044] A non-transitory computer readable medium for wireless
communication by a base station in a system that supports a first
RAT corresponding to a first TTI duration and a second RAT
corresponding to a second TTI duration that is different than the
first TTI duration is described. The non-transitory
computer-readable medium may include instructions operable to cause
a processor to transmit a message specifying a PHR type
corresponding to at least one channel of the first RAT and at least
one channel of the second RAT, receive a joint PHR based at least
in part on the PHR type, and allocate resources to a UE based at
least in part on the joint PHR.
[0045] Some examples of the method, apparatus, and non-transitory
computer-readable medium described above may further include
processes, features, means, or instructions for transmitting a
second message specifying a second PHR type that differs from the
PHR type. Some examples of the method, apparatus, and
non-transitory computer-readable medium described above may further
include processes, features, means, or instructions for receiving a
second joint PHR based at least in part on the second PHR type.
Some examples of the method, apparatus, and non-transitory
computer-readable medium described above may further include
processes, features, means, or instructions for determining whether
to adjust the allocated resources based at least in part on the
second joint PHR.
BRIEF DESCRIPTION OF THE DRAWINGS
[0046] FIG. 1 illustrates an example of a system for wireless
communication that supports power headroom report for Long Term
Evolution New Radio (LTE-NR) co-existence in accordance with
aspects of the present disclosure.
[0047] FIG. 2 illustrates an example of a wireless communications
system that supports power headroom report for LTE-NR co-existence
in accordance with aspects of the present disclosure.
[0048] FIG. 3 illustrates an example of a timing configuration that
supports power headroom report for LTE-NR co-existence in
accordance with aspects of the present disclosure.
[0049] FIG. 4 illustrates an example of a power headroom report
(PHR) schedule that supports power headroom report for LTE-NR
co-existence in accordance with aspects of the present
disclosure.
[0050] FIG. 5 illustrates an example of a process flow that
supports power headroom report for LTE-NR co-existence in
accordance with aspects of the present disclosure.
[0051] FIG. 6 illustrates an example of a timing configuration that
supports power headroom report for LTE-NR co-existence in
accordance with aspects of the present disclosure.
[0052] FIG. 7 illustrates an example of a PHR schedule that
supports power headroom report for LTE-NR co-existence in
accordance with aspects of the present disclosure.
[0053] FIG. 8 illustrates an example of a process flow that
supports power headroom report for LTE-NR co-existence in
accordance with aspects of the present disclosure.
[0054] FIGS. 9 through 11 show block diagrams of a device that
supports power headroom report for LTE-NR co-existence in
accordance with aspects of the present disclosure.
[0055] FIG. 12 illustrates a block diagram of a system including a
user equipment (UE) that supports power headroom report for LTE-NR
co-existence in accordance with aspects of the present
disclosure.
[0056] FIGS. 13 through 15 show block diagrams of a device that
supports power headroom report for LTE-NR co-existence in
accordance with aspects of the present disclosure.
[0057] FIG. 16 illustrates a block diagram of a system including a
base station that supports power headroom report for LTE-NR
co-existence in accordance with aspects of the present
disclosure.
[0058] FIGS. 17 through 22 illustrate methods for power headroom
report for LTE-NR co-existence in accordance with aspects of the
present disclosure.
DETAILED DESCRIPTION
[0059] The described techniques support improved power headroom
reporting for Long Term Evolution New Radio (LTE-NR) co-existence.
In some examples, a user equipment (UE) may support connectivity
via multiple radio access technologies (RATs) that operate using
different transmission time intervals (TTIs). In the examples
described herein, a UE may send multiple power headroom reports
(PHRs) or a joint PHR in accordance with a reporting schedule
determined based on the different TTI durations to enable a base
station to improve allocation of resources for the multiple RATs.
In an example, the multiple PHRs may include a PHR and a companion
PHR that may be sent in accordance with the PHR reporting schedules
of the RATs. In an example, the joint PHR may report power headroom
information for specific channels and/or RATs as indicated in a PHR
type.
[0060] In some wireless communications systems, a base station may
communicate with a UE. While communicating with one or more UEs,
the base station may determine whether to increase, decrease, or
maintain an amount of bandwidth allocated to a particular UE for
communication. The base station may utilize power headroom
information to make this or other determinations. In some examples,
a base station may configure a UE with a schedule at which the UE
is to provide a PHR to the base station. The PHR may include a
calculation of a power headroom value for one or more channels. The
UE may calculate a power headroom value as the difference between a
maximum transmission power of the UE and a total estimated
transmission power in the one or more channels. If the UE is not
scheduled to transmit on a particular channel when scheduled to
provide a PHR, the UE may calculate a virtual PHR. In some cases, a
UE may support more than one RAT. In some cases, different RATs may
correspond to different TTI durations and have different PHR
reporting schedules.
[0061] In some examples, a UE that supports multi-RAT connectivity
may semi-statically split transmission power between multiple RATs.
The UE may generate a separate PHR for each RAT. For example, the
UE may generate a PHR for a first RAT according to a reporting
schedule for the first RAT. Because the UE supports multiple RATs,
the UE may also generate a companion PHR for any other RAT (e.g., a
second RAT and/or additional RAT) that the UE also supports. The UE
may send both the PHR and one or more companion PHRs to the base
station corresponding to the reporting schedule for the first RAT.
The UE may send the one or more companion PHRs even though a
reporting schedule of the other RATs may not indicate that a PHR is
due. The UE may also generate a PHR for the second RAT and a CPHR
for the first RAT or any other RAT. The UE may transmit the PHR for
the second RAT and the CPHR for the first RAT or any other RAT
based on the second PHR schedule. Like above, the UE may send the
one or more companion PHRs even though a reporting schedule of the
first RAT or any other RAT may not indicate that a PHR is due.
Beneficially, the UE more frequently provides the base station with
a PHR for each RAT, and the base station may use the PHRs to
efficiently allocate resources to the UE.
[0062] In some examples, a UE that supports multi-RAT connectivity
may utilize joint power management that dynamically divides
transmission power between multiple RATs. In some examples, the
base station may inform the UE of a PHR type. A PHR type may
specify that the UE is to calculate power headroom for a set of one
or more channels of one or more RATs. The UE may calculate a power
headroom value for the requested PHR type, and generate a joint PHR
that includes the power headroom value. In some examples, the UE
may determine a schedule for sending the PHR based on the
periodicity of the RAT having the shortest TTI. Beneficially, the
base station may be informed of joint power headroom information
for the RATs based on how transmission power is currently being
jointly managed for the multiple RATs, and the base station may use
the joint power headroom information to improve allocation of
resources for the multiple RATs.
[0063] Aspects of the disclosure are initially described in the
context of a wireless communications system. Aspects of the
disclosure are also described in the context of timing
configuration diagrams, scheduling diagrams, and process flow
diagrams. Aspects of the disclosure are further illustrated by and
described with reference to apparatus diagrams, system diagrams,
and flowcharts that relate to power headroom report for LTE-NR
co-existence.
[0064] FIG. 1 illustrates an example of a wireless communications
system 100 in accordance with various aspects of the present
disclosure. The wireless communications system 100 includes base
stations 105, UEs 115, and a core network 130. In some examples,
the wireless communications system 100 may be a Long Term Evolution
(LTE) network, an LTE-Advanced (LTE-A) network, or a New Radio (NR)
network. In some cases, wireless communications system 100 may
support enhanced broadband communications, ultra-reliable (e.g.,
mission critical) communications, low latency communications, or
communications with low-cost and low-complexity devices.
[0065] Base stations 105 may wirelessly communicate with UEs 115
via one or more base station antennas. Base stations 105 described
herein may include or may be referred to by those skilled in the
art as a base transceiver station, a radio base station, an access
point, a radio transceiver, a NodeB, an eNodeB (eNB), a
next-generation Node B or giga-nodeB (either of which may be
referred to as a gNB), a Home NodeB, a Home eNodeB, or some other
suitable terminology. Wireless communications system 100 may
include base stations 105 of different types (e.g., macro or small
cell base stations). The UEs 115 described herein may be able to
communicate with various types of base stations 105 and network
equipment including macro eNBs, small cell eNBs, gNBs, relay base
stations, and the like.
[0066] Each base station 105 may be associated with a particular
geographic coverage area 110 in which communications with various
UEs 115 is supported. Each base station 105 may provide
communication coverage for a respective geographic coverage area
110 via communication links 125, and communication links 125
between a base station 105 and a UE 115 may utilize one or more
carriers. Communication links 125 shown in wireless communications
system 100 may include uplink transmissions from a UE 115 to a base
station 105, or downlink transmissions, from a base station 105 to
a UE 115. Downlink transmissions may also be called forward link
transmissions while uplink transmissions may also be called reverse
link transmissions.
[0067] The geographic coverage area 110 for a base station 105 may
be divided into sectors making up only a portion of the geographic
coverage area 110, and each sector may be associated with a cell.
For example, each base station 105 may provide communication
coverage for a macro cell, a small cell, a hot spot, or other types
of cells, or various combinations thereof. In some examples, a base
station 105 may be movable and therefore provide communication
coverage for a moving geographic coverage area 110. In some
examples, different geographic coverage areas 110 associated with
different technologies may overlap, and overlapping geographic
coverage areas 110 associated with different technologies may be
supported by the same base station 105 or by different base
stations 105. The wireless communications system 100 may include,
for example, a heterogeneous LTE/LTE-A or NR network in which
different types of base stations 105 provide coverage for various
geographic coverage areas 110.
[0068] The term "cell" refers to a logical communication entity
used for communication with a base station 105 (e.g., over a
carrier), and may be associated with an identifier for
distinguishing neighboring cells (e.g., a physical cell identifier
(PCID), a virtual cell identifier (VCID)) operating via the same or
a different carrier. In some examples, a carrier may support
multiple cells, and different cells may be configured according to
different protocol types (e.g., machine-type communication (MTC),
narrowband Internet-of-Things (NB-IoT), enhanced mobile broadband
(eMBB), or others) that may provide access for different types of
devices. In some cases, the term "cell" may refer to a portion of a
geographic coverage area 110 (e.g., a sector) over which the
logical entity operates.
[0069] UEs 115 may be dispersed throughout the wireless
communications system 100, and each UE 115 may be stationary or
mobile. A UE 115 may also be referred to as a mobile device, a
wireless device, a remote device, a handheld device, or a
subscriber device, or some other suitable terminology, where the
"device" may also be referred to as a unit, a station, a terminal,
or a client. A UE 115 may also be a personal electronic device such
as a cellular phone, a personal digital assistant (PDA), a tablet
computer, a laptop computer, or a personal computer. In some
examples, a UE 115 may also refer to a wireless local loop (WLL)
station, an Internet of Things (IoT) device, an Internet of
Everything (IoE) device, or an MTC device, or the like, which may
be implemented in various articles such as appliances, vehicles,
meters, or the like.
[0070] Some UEs 115, such as MTC or IoT devices, may be low cost or
low complexity devices, and may provide for automated communication
between machines (e.g., via Machine-to-Machine (M2M)
communication). M2M communication or MTC may refer to data
communication technologies that allow devices to communicate with
one another or a base station 105 without human intervention. In
some examples, M2M communication or MTC may include communications
from devices that integrate sensors or meters to measure or capture
information and relay that information to a central server or
application program that can make use of the information or present
the information to humans interacting with the program or
application. Some UEs 115 may be designed to collect information or
enable automated behavior of machines. Examples of applications for
MTC devices include smart metering, inventory monitoring, water
level monitoring, equipment monitoring, healthcare monitoring,
wildlife monitoring, weather and geological event monitoring, fleet
management and tracking, remote security sensing, physical access
control, and transaction-based business charging.
[0071] Some UEs 115 may be configured to employ operating modes
that reduce power consumption, such as half-duplex communications
(e.g., a mode that supports one-way communication via transmission
or reception, but not transmission and reception simultaneously).
In some examples half-duplex communications may be performed at a
reduced peak rate. Other power conservation techniques for UEs 115
include entering a power saving "deep sleep" mode when not engaging
in active communications, or operating over a limited bandwidth
(e.g., according to narrowband communications). In some cases, UEs
115 may be designed to support critical functions (e.g., mission
critical functions), and a wireless communications system 100 may
be configured to provide ultra-reliable communications for these
functions.
[0072] In some cases, a UE 115 may also be able to communicate
directly with other UEs 115 (e.g., using a peer-to-peer (P2P) or
device-to-device (D2D) protocol). One or more of a group of UEs 115
utilizing D2D communications may be within the geographic coverage
area 110 of a base station 105. Other UEs 115 in such a group may
be outside the geographic coverage area 110 of a base station 105,
or be otherwise unable to receive transmissions from a base station
105. In some cases, groups of UEs 115 communicating via D2D
communications may utilize a one-to-many (1:M) system in which each
UE 115 transmits to every other UE 115 in the group. In some cases,
a base station 105 facilitates the scheduling of resources for D2D
communications. In other cases, D2D communications are carried out
between UEs 115 without the involvement of a base station 105.
[0073] Base stations 105 may communicate with the core network 130
and with one another. For example, base stations 105 may interface
with the core network 130 through backhaul links 132 (e.g., via an
51 or other interface). Base stations 105 may communicate with one
another over backhaul links 134 (e.g., via an X2 or other
interface) either directly (e.g., directly between base stations
105) or indirectly (e.g., via core network 130).
[0074] The core network 130 may provide user authentication, access
authorization, tracking, Internet Protocol (IP) connectivity, and
other access, routing, or mobility functions. The core network 130
may be an evolved packet core (EPC), which may include at least one
mobility management entity (MME), at least one serving gateway
(S-GW), and at least one Packet Data Network (PDN) gateway (P-GW).
The MME may manage non-access stratum (e.g., control plane)
functions such as mobility, authentication, and bearer management
for UEs 115 served by base stations 105 associated with the EPC.
User IP packets may be transferred through the S-GW, which itself
may be connected to the P-GW. The P-GW may provide IP address
allocation as well as other functions. The P-GW may be connected to
the network operators IP services. The operators IP services may
include access to the Internet, Intranet(s), an IP Multimedia
Subsystem (IMS), or a Packet-Switched (PS) Streaming Service.
[0075] At least some of the network devices, such as a base station
105, may include subcomponents such as an access network entity,
which may be an example of an access node controller (ANC). Each
access network entity may communicate with UEs 115 through a number
of other access network transmission entities, which may be
referred to as a radio head, a smart radio head, or a
transmission/reception point (TRP). In some configurations, various
functions of each access network entity or base station 105 may be
distributed across various network devices (e.g., radio heads and
access network controllers) or consolidated into a single network
device (e.g., a base station 105).
[0076] Wireless communications system 100 may operate using one or
more frequency bands, typically in the range of 300 MHz to 300 GHz.
Generally, the region from 300 MHz to 3 GHz is known as the
ultra-high frequency (UHF) region or decimeter band, since the
wavelengths range from approximately one decimeter to one meter in
length. UHF waves may be blocked or redirected by buildings and
environmental features. However, the waves may penetrate structures
sufficiently for a macro cell to provide service to UEs 115 located
indoors. Transmission of UHF waves may be associated with smaller
antennas and shorter range (e.g., less than 100 km) compared to
transmission using the smaller frequencies and longer waves of the
high frequency (HF) or very high frequency (VHF) portion of the
spectrum below 300 MHz.
[0077] Wireless communications system 100 may also operate in a
super high frequency (SHF) region using frequency bands from 3 GHz
to 30 GHz, also known as the centimeter band. The SHF region
includes bands such as the 5 GHz industrial, scientific, and
medical (ISM) bands, which may be used opportunistically by devices
that can tolerate interference from other users.
[0078] Wireless communications system 100 may also operate in an
extremely high frequency (EHF) region of the spectrum (e.g., from
30 GHz to 300 GHz), also known as the millimeter band. In some
examples, wireless communications system 100 may support millimeter
wave (mmW) communications between UEs 115 and base stations 105,
and EHF antennas of the respective devices may be even smaller and
more closely spaced than UHF antennas. In some cases, this may
facilitate use of antenna arrays within a UE 115. However, the
propagation of EHF transmissions may be subject to even greater
atmospheric attenuation and shorter range than SHF or UHF
transmissions. Techniques disclosed herein may be employed across
transmissions that use one or more different frequency regions, and
designated use of bands across these frequency regions may differ
by country or regulating body.
[0079] In some cases, wireless communications system 100 may
utilize both licensed and unlicensed radio frequency spectrum
bands. For example, wireless communications system 100 may employ
License Assisted Access (LAA), LTE-Unlicensed LTE-U radio access
technology, or NR technology in an unlicensed band such as the 5
GHz ISM band. When operating in unlicensed radio frequency spectrum
bands, wireless devices such as base stations 105 and UEs 115 may
employ listen-before-talk (LBT) procedures to ensure a frequency
channel is clear before transmitting data. In some cases,
operations in unlicensed bands may be based on a CA configuration
in conjunction with CCs operating in a licensed band (e.g., LAA).
Operations in unlicensed spectrum may include downlink
transmissions, uplink transmissions, peer-to-peer transmissions, or
a combination of these. Duplexing in unlicensed spectrum may be
based on frequency division duplexing (FDD), time division
duplexing (TDD), or a combination of both.
[0080] In some examples, base station 105 or UE 115 may be equipped
with multiple antennas, which may be used to employ techniques such
as transmit diversity, receive diversity, multiple-input
multiple-output (MIMO) communications, or beamforming. For example,
wireless communications system may use a transmission scheme
between a transmitting device (e.g., a base station 105) and a
receiving device (e.g., a UE 115), where the transmitting device is
equipped with multiple antennas and the receiving devices are
equipped with one or more antennas. MIMO communications may employ
multipath signal propagation to increase the spectral efficiency by
transmitting or receiving multiple signals via different spatial
layers, which may be referred to as spatial multiplexing. The
multiple signals may, for example, be transmitted by the
transmitting device via different antennas or different
combinations of antennas. Likewise, the multiple signals may be
received by the receiving device via different antennas or
different combinations of antennas. Each of the multiple signals
may be referred to as a separate spatial stream, and may carry bits
associated with the same data stream (e.g., the same codeword) or
different data streams. Different spatial layers may be associated
with different antenna ports used for channel measurement and
reporting. MIMO techniques include single-user MIMO (SU-MIMO) where
multiple spatial layers are transmitted to the same receiving
device, and multiple-user MIMO (MU-MIMO) where multiple spatial
layers are transmitted to multiple devices.
[0081] Beamforming, which may also be referred to as spatial
filtering, directional transmission, or directional reception, is a
signal processing technique that may be used at a transmitting
device or a receiving device (e.g., a base station 105 or a UE 115)
to shape or steer an antenna beam (e.g., a transmit beam or receive
beam) along a spatial path between the transmitting device and the
receiving device. Beamforming may be achieved by combining the
signals communicated via antenna elements of an antenna array such
that signals propagating at particular orientations with respect to
an antenna array experience constructive interference while others
experience destructive interference. The adjustment of signals
communicated via the antenna elements may include a transmitting
device or a receiving device applying certain amplitude and phase
offsets to signals carried via each of the antenna elements
associated with the device. The adjustments associated with each of
the antenna elements may be defined by a beamforming weight set
associated with a particular orientation (e.g., with respect to the
antenna array of the transmitting device or receiving device, or
with respect to some other orientation).
[0082] In one example, a base station 105 may use multiple antennas
or antenna arrays to conduct beamforming operations for directional
communications with a UE 115. For instance, some signals (e.g.
synchronization signals, reference signals, beam selection signals,
or other control signals) may be transmitted by a base station 105
multiple times in different directions, which may include a signal
being transmitted according to different beamforming weight sets
associated with different directions of transmission. Transmissions
in different beam directions may be used to identify (e.g., by the
base station 105 or a receiving device, such as a UE 115) a beam
direction for subsequent transmission and/or reception by the base
station 105. Some signals, such as data signals associated with a
particular receiving device, may be transmitted by a base station
105 in a single beam direction (e.g., a direction associated with
the receiving device, such as a UE 115). In some examples, the beam
direction associated with transmissions along a single beam
direction may be determined based at least in in part on a signal
that was transmitted in different beam directions. For example, a
UE 115 may receive one or more of the signals transmitted by the
base station 105 in different directions, and the UE 115 may report
to the base station 105 an indication of the signal it received
with a highest signal quality, or an otherwise acceptable signal
quality. Although these techniques are described with reference to
signals transmitted in one or more directions by a base station
105, a UE 115 may employ similar techniques for transmitting
signals multiple times in different directions (e.g., for
identifying a beam direction for subsequent transmission or
reception by the UE 115), or transmitting a signal in a single
direction (e.g., for transmitting data to a receiving device).
[0083] A receiving device (e.g., a UE 115, which may be an example
of a mmW receiving device) may try multiple receive beams when
receiving various signals from the base station 105, such as
synchronization signals, reference signals, beam selection signals,
or other control signals. For example, a receiving device may try
multiple receive directions by receiving via different antenna
subarrays, by processing received signals according to different
antenna subarrays, by receiving according to different receive
beamforming weight sets applied to signals received at a plurality
of antenna elements of an antenna array, or by processing received
signals according to different receive beamforming weight sets
applied to signals received at a plurality of antenna elements of
an antenna array, any of which may be referred to as "listening"
according to different receive beams or receive directions. In some
examples a receiving device may use a single receive beam to
receive along a single beam direction (e.g., when receiving a data
signal). The single receive beam may be aligned in a beam direction
determined based at least in part on listening according to
different receive beam directions (e.g., a beam direction
determined to have a highest signal strength, highest
signal-to-noise ratio, or otherwise acceptable signal quality based
at least in part on listening according to multiple beam
directions).
[0084] In some cases, the antennas of a base station 105 or UE 115
may be located within one or more antenna arrays, which may support
MIMO operations, or transmit or receive beamforming. For example,
one or more base station antennas or antenna arrays may be
co-located at an antenna assembly, such as an antenna tower. In
some cases, antennas or antenna arrays associated with a base
station 105 may be located in diverse geographic locations. A base
station 105 may have an antenna array with a number of rows and
columns of antenna ports that the base station 105 may use to
support beamforming of communications with a UE 115. Likewise, a UE
115 may have one or more antenna arrays that may support various
MIMO or beamforming operations.
[0085] In some cases, wireless communications system 100 may be a
packet-based network that operate according to a layered protocol
stack. In the user plane, communications at the bearer or Packet
Data Convergence Protocol (PDCP) layer may be IP-based. A Radio
Link Control (RLC) layer may in some cases perform packet
segmentation and reassembly to communicate over logical channels. A
Medium Access Control (MAC) layer may perform priority handling and
multiplexing of logical channels into transport channels. The MAC
layer may also use hybrid automatic repeat request (HARQ) to
provide retransmission at the MAC layer to improve link efficiency.
In the control plane, the Radio Resource Control (RRC) protocol
layer may provide establishment, configuration, and maintenance of
an RRC connection between a UE 115 and a base station 105 or core
network 130 supporting radio bearers for user plane data. At the
Physical (PHY) layer, transport channels may be mapped to physical
channels.
[0086] In some cases, UEs 115 and base stations 105 may support
retransmissions of data to increase the likelihood that data is
received successfully. HARQ feedback is one technique of increasing
the likelihood that data is received correctly over a communication
link 125. HARQ may include a combination of error detection (e.g.,
using a cyclic redundancy check (CRC)), forward error correction
(FEC), and retransmission (e.g., automatic repeat request (ARQ)).
HARQ may improve throughput at the MAC layer in poor radio
conditions (e.g., signal-to-noise conditions). In some cases, a
wireless device may support same-slot HARQ feedback, where the
device may provide HARQ feedback in a specific slot for data
received in a previous symbol in the slot. In other cases, the
device may provide HARQ feedback in a subsequent slot, or according
to some other time interval.
[0087] Time intervals in LTE or NR may be expressed in multiples of
a basic time unit, which may, for example, refer to a sampling
period of T.sub.s= 1/30,720,000 seconds. Time intervals of a
communications resource may be organized according to radio frames
each having a duration of 10 milliseconds (ms), where the frame
period may be expressed as T.sub.f=307,200 T.sub.s. The radio
frames may be identified by a system frame number (SFN) ranging
from 0 to 1023. Each frame may include 10 subframes numbered from 0
to 9, and each subframe may have a duration of 1 ms. A subframe may
be further divided into 2 slots each having a duration of 0.5 ms,
and each slot may contain 6 or 7 modulation symbol periods (e.g.,
depending on the length of the cyclic prefix prepended to each
symbol period). Excluding the cyclic prefix, each symbol period may
contain 2048 sampling periods. In some cases a subframe may be the
smallest scheduling unit of the wireless communications system 100,
and may be referred to as a TTI. In other cases, a smallest
scheduling unit of the wireless communications system 100 may be
shorter than a subframe or may be dynamically selected (e.g., in
bursts of shortened TTIs (sTTIs) or in selected component carriers
using sTTIs).
[0088] In some wireless communications systems, a slot may further
be divided into multiple mini-slots containing one or more symbols.
In some instances, a symbol of a mini-slot or a mini-slot may be
the smallest unit of scheduling. Each symbol may vary in duration
depending on the subcarrier spacing or frequency band of operation,
for example. Further, some wireless communications systems may
implement slot aggregation in which multiple slots or mini-slots
are aggregated together and used for communication between a UE 115
and a base station 105.
[0089] The term "carrier" refers to a set of radio frequency
spectrum resources having a defined physical layer structure for
supporting communications over a communication link 125. For
example, a carrier of a communication link 125 may include a
portion of a radio frequency spectrum band that is operated
according to physical layer channels for a given radio access
technology. Each physical layer channel may carry user data,
control information, or other signaling. A carrier may be
associated with a pre-defined frequency channel (e.g., an E-UTRA
absolute radio frequency channel number (EARFCN)), and may be
positioned according to a channel raster for discovery by UEs 115.
Carriers may be downlink or uplink (e.g., in an FDD mode), or be
configured to carry downlink and uplink communications (e.g., in a
TDD mode). In some examples, signal waveforms transmitted over a
carrier may be made up of multiple sub-carriers (e.g., using
multi-carrier modulation (MCM) techniques such as OFDM or
DFT-s-OFDM).
[0090] The organizational structure of the carriers may be
different for different radio access technologies (e.g., LTE,
LTE-A, NR, etc.). For example, communications over a carrier may be
organized according to TTIs or slots, each of which may include
user data as well as control information or signaling to support
decoding the user data. A carrier may also include dedicated
acquisition signaling (e.g., synchronization signals or system
information, etc.) and control signaling that coordinates operation
for the carrier. In some examples (e.g., in a carrier aggregation
configuration), a carrier may also have acquisition signaling or
control signaling that coordinates operations for other
carriers.
[0091] Physical channels may be multiplexed on a carrier according
to various techniques. A physical control channel and a physical
data channel may be multiplexed on a downlink carrier, for example,
using time division multiplexing (TDM) techniques, frequency
division multiplexing (FDM) techniques, or hybrid TDM-FDM
techniques. In some examples, control information transmitted in a
physical control channel may be distributed between different
control regions in a cascaded manner (e.g., between a common
control region or common search space and one or more UE-specific
control regions or UE-specific search spaces).
[0092] A carrier may be associated with a particular bandwidth of
the radio frequency spectrum, and in some examples the carrier
bandwidth may be referred to as a "system bandwidth" of the carrier
or the wireless communications system 100. For example, the carrier
bandwidth may be one of a number of predetermined bandwidths for
carriers of a particular radio access technology (e.g., 1.4, 3, 5,
10, 15, 20, 40, or 80 MHz). In some examples, each served UE 115
may be configured for operating over portions or all of the carrier
bandwidth. In other examples, some UEs 115 may be configured for
operation using a narrowband protocol type that is associated with
a predefined portion or range (e.g., set of subcarriers or RB s)
within a carrier (e.g., "in-band" deployment of a narrowband
protocol type).
[0093] In a system employing MCM techniques, a resource element may
consist of one symbol period (e.g., a duration of one modulation
symbol) and one subcarrier, where the symbol period and subcarrier
spacing are inversely related. The number of bits carried by each
resource element may depend on the modulation scheme (e.g., the
order of the modulation scheme). Thus, the more resource elements
that a UE 115 receives and the higher the order of the modulation
scheme, the higher the data rate may be for the UE 115. In MIMO
systems, a wireless communications resource may refer to a
combination of a radio frequency spectrum resource, a time
resource, and a spatial resource (e.g., spatial layers), and the
use of multiple spatial layers may further increase the data rate
for communications with a UE 115.
[0094] Devices of the wireless communications system 100 (e.g.,
base stations 105 or UEs 115) may have a hardware configuration
that supports communications over a particular carrier bandwidth,
or may be configurable to support communications over one of a set
of carrier bandwidths. In some examples, the wireless
communications system 100 may include base stations 105 and/or UEs
that can support simultaneous communications via carriers
associated with more than one different carrier bandwidth.
[0095] Wireless communications system 100 may support communication
with a UE 115 on multiple cells or carriers, a feature which may be
referred to as carrier aggregation (CA) or multi-carrier operation.
A UE 115 may be configured with multiple downlink CCs and one or
more uplink CCs according to a carrier aggregation configuration.
Carrier aggregation may be used with both FDD and TDD component
carriers.
[0096] In some cases, wireless communications system 100 may
utilize enhanced component carriers (eCCs). An eCC may be
characterized by one or more features including wider carrier or
frequency channel bandwidth, shorter symbol duration, shorter TTI
duration, or modified control channel configuration. In some cases,
an eCC may be associated with a carrier aggregation configuration
or a multi-RAT connectivity configuration (e.g., when multiple
serving cells have a suboptimal or non-ideal backhaul link). An eCC
may also be configured for use in unlicensed spectrum or shared
spectrum (e.g., where more than one operator is allowed to use the
spectrum). An eCC characterized by wide carrier bandwidth may
include one or more segments that may be utilized by UEs 115 that
are not capable of monitoring the whole carrier bandwidth or are
otherwise configured to use a limited carrier bandwidth (e.g., to
conserve power).
[0097] In some cases, an eCC may utilize a different symbol
duration than other CCs, which may include use of a reduced symbol
duration as compared with symbol durations of the other CCs. A
shorter symbol duration may be associated with increased spacing
between adjacent subcarriers. A device, such as a UE 115 or base
station 105, utilizing eCCs may transmit wideband signals (e.g.,
according to frequency channel or carrier bandwidths of 20, 40, 60,
80 MHz, etc.) at reduced symbol durations (e.g., 16.67
microseconds). A TTI in eCC may consist of one or multiple symbol
periods. In some cases, the TTI duration (that is, the number of
symbol periods in a TTI) may be variable.
[0098] Wireless communications systems such as an NR system may
utilize any combination of licensed, shared, and unlicensed
spectrum bands, among others. The flexibility of eCC symbol
duration and subcarrier spacing may allow for the use of eCC across
multiple spectrums. In some examples, NR shared spectrum may
increase spectrum utilization and spectral efficiency, specifically
through dynamic vertical (e.g., across frequency) and horizontal
(e.g., across time) sharing of resources.
[0099] Conventional systems may not be optimized to efficiently
allocate resources for RATs that operate using different TTI
durations.
[0100] In accordance with the techniques described herein, base
station 105 may configure a UE 115 supporting multi-RAT
connectivity with a PHR reporting schedule for each RAT. For a UE
115 that semi-statically splits transmission power between multiple
RATs, the UE 115 may generate a PHR report for a first RAT based on
a PHR schedule, and may also generate a companion PHR for a second
RAT on which the UE 115 is not currently scheduled to send a PHR.
UE 115 may transmit the PHR and the companion PHR to base station
105, which may determine subsequent resource allocation based on
the received PHR and companion PHR. Base station 105 may utilize
the PHR and the companion PHR in allocating resources for
subsequent transmissions. In another example, UE 115 may utilize
joint power management that dynamically divides transmission power
between multiple RATs. The UE 115 may receive a PHR type from base
station 105. The PHR type may specify channels and/or RATs on which
the UE 115 is to report a power headroom (PH) value. UE 115 may
calculate a PH value based on the indicated channels for each RAT,
and may transmit a joint PHR that includes the calculated PH value.
Base station 105 may utilize the received joint PHR in allocating
resources for subsequent transmissions.
[0101] FIG. 2 illustrates an example of a wireless communications
system 200 that supports power headroom report for LTE-NR
co-existence in accordance with various aspects of the present
disclosure. In some examples, wireless communications system 200
may implement aspects of wireless communications system 100.
Wireless communications system 200 may include a base station 105-a
and a UE 115-a, which may be examples of the corresponding devices
described with reference to FIG. 1.
[0102] In some examples, a base station 105-a may communicate with
one or more UEs 115 within a geographic coverage area 110-a. For
example, base station 105-a and UE 115-a may communicate with each
other via downlink transmission 205 and uplink transmission 210.
Base station 105-a may utilize a power headroom (PH) value received
from a to determine how to allocate resources to the UE, such as UE
115-a. In some examples, base station 105-a may determine whether
to increase or decrease an allocated bandwidth for UE 115-a based
on a PH value received from UE 115-a.
[0103] Power headroom may be defined as an estimate of scheduled
transmission power for one or more channels subtracted from a
maximum available transmission power of UE 115-a. The estimated
transmission power may be calculated based on a current modulation
and coding scheme (MCS), current transmission channel, format of a
message being communicated, number of resource blocks allocated for
a transmission, or other metrics corresponding to UE 115-a. Base
station 105-a may schedule power headroom reporting and/or identify
requested PHR types to UE 115-a via one or more downlink
transmissions 205. UE 115-a may respond with a PHR as requested or
scheduled.
[0104] In some cases, wireless communications devices in wireless
communications system 200 may support multi-RAT connectivity. In an
example, UE 115-a may support a first RAT (e.g., LTE RAT) and a
second RAT (e.g., NR RAT). Base station 105-a may request the UE
115-a provide a PHR for the first RAT and a PHR for the second RAT,
so as to be able to allocate resources to the UE 115-a.
[0105] In some examples, uplink transmission power of UE 115-a may
be semi-statically split between multiple RATs (e.g., LTE and NR).
In an example, the UE 115-a may semi-statically divide its
available transmission power between two or more RATs. For example,
fifty percent of available transmission power may be allocated to
an LTE RAT, and fifty percent of available transmission power may
be allocated to a NR RAT. UE 115-a may semi-statically split power
between more than one RAT in any percentage. Base station 105-a may
send, via downlink transmission 205, a schedule for sending PHRs
for a first RAT, and PHRs for a second RAT. For example, UE 115-a
may generate and transmit a PHR for a first RAT in accordance with
a first PHR schedule. UE 115-a may also generate a companion PHR
(CPHR) for a second RAT in accordance with the first PHR schedule,
even though a second PHR schedule of the second RAT does not
indicate that the UE 115-a is due to send a PHR. UE 115-a may
transmit a PHR and CPHR to base station 105-a via uplink
transmission 210. The UE 115-a may similarly generate a PHR for the
second RAT in accordance with the second PHR schedule, as well as a
CPHR for the first RAT. These principles may be extended to any
number of RATS. Base station 105-a may determine resource
allocation based on received PHRs and CPHRs.
[0106] In some examples, UE 115-a may jointly manage uplink
transmission power of multiple RATs. In joint power management, UE
115-a determine how much transmission power to allocate to each RAT
for transmission in one or more channels at a particular time. Base
station 105-a may schedule uplink transmissions for the UE 115-a,
and the UE 115-a may periodically provide a joint PHR to indicate
power headroom. Because the base station 105-a controls scheduling
on one or more uplink channels, the base station 105-a may inform
the UE 115-a of what types of channels to report a PH value. In an
example, base station 105-a may transmit an indication to UE 115-a
via downlink transmission 205. The indication may include a PHR
type. The PHR type may specify which RATs and which channels the UE
115-a is to use for generating the joint PH value. UE 115-a may
process the PHR type to identify the channels and RATs on which a
PH value is to be calculated, and may generate a joint PHR that
includes the PH value. UE 115-a may transmit the joint PHR to base
station 105-c via uplink transmission 210, and base station 105-a
may determine resource allocation based thereon.
[0107] FIG. 3 illustrates an example of a timing configuration 300
that supports power headroom report for LTE-NR co-existence in
accordance with various aspects of the present disclosure. In some
examples, wireless communications system 100 and 200 may implement
aspects of timing configuration 300 may implement. In some
examples, different RATs may have different numerologies (e.g.,
different sub-carrier spacing, different TTI durations, etc.). For
example, an LTE sub-frame 305 may have a first TTI duration 310
(e.g., 1 ms) and a NR slot may have a second TTI duration 320
(e.g., 0.5 ms. In the depicted example, a LTE sub-frame 305 has the
same duration as two NR slots 315-a, 315-a.
[0108] In some examples, a base station 105 may transmit to a UE
115 a PHR schedule, and the PHR schedule may be different for each
RAT supported by the UE 115. For instance, an LTE PH reporting
schedule may indicate a periodicity at which the UE 115 is to
provide a PHR for the LTE RAT. For example, the LTE PH reporting
schedule may indicate that the UE 115-a is to send a PHR once per a
defined numbers LTE sub-frames 305 (e.g., once per every 10
subframes). An NR PHR schedule may indicate a periodicity at which
the UE 115 is to provide a PHR for the NR RAT. For example, the NR
PHR schedule may indicate that the UE 115-a is to send a PHR once
per a defined numbers NR slots 315. In some examples, a NR PH
reporting schedule does not coincide with transmitted LTE PH
reporting schedule. Moreover, different RATs may be scheduled to
provide PHRs at different periodicities. Thus, at a point in time
where a UE 115-a is only scheduled to transmit a PHR for a first
RAT, base station 105-a may have stale PH information for a second
RAT because a PHR corresponding to the second RAT is not due until
some later point in time. To increase the likelihood that the base
station 105-a has up to date PH values for each RAT, the UE 115-a
may generate and send at least one companion PHR each time the UE
is scheduled to send a PHR for a particular RAT.
[0109] FIG. 4 illustrates an example of a timing diagram 400 that
supports power headroom report for LTE-NR co-existence in
accordance with various aspects of the present disclosure. In some
examples, wireless communications system 100 may implement aspects
of timing diagram 400. A base station 105 may configure the UE 115
with one or more PHR schedules indicating when the UE 115 is to
send a PHR. A first timeline 405 may depict times when the UE 115
is scheduled to send PHRs for a first RAT R1 (e.g., LTE RAT). In
the depicted example, PHR 410 and PHR 420 are scheduled to be sent
at a first periodicity 455 corresponding to times TR10 and TR11. A
second timeline 440 may depict times when the UE 115 is scheduled
to send PHRs for a second RAT R2 (e.g., NR RAT). In the depicted
example, PHR 445 may be scheduled at time TR20 and PHR 445 may be
scheduled at time TR21. TR20 and TR21 may be offset by a second
periodicity 460.
[0110] A scheduled LTE PHR (e.g., PHR 410) may not align with a
scheduled NR PHR (e.g., PHR 445) because of the different TTI
durations for the different RATs. In such cases, a UE 115 may
generate a CPHR for the other RAT to send along with the scheduled
PHR. The CPHR may be a PHR for the RAT that is not yet due to send
a PHR. For example, a UE 115 may determine that an LTE PHR 410 is
due at TR10, and that there is no scheduled NR PHR at TR10. The UE
115 may generate a CPHR 415 to transmit together with PHR 410. Base
station 105 may receive PHR 410 and CPHR 415, and may utilize the
PH values of each RAT to allocate resources for subsequent
transmissions. Similarly, at TR20, UE 115 may determine that a NR
PHR 445 is scheduled, but that there is no corresponding LTE PHR
scheduled at the same time. Thus, UE 115 may generate an LTE CPHR
450.
[0111] A PHR (or a CPHR) may be based on a scheduled upcoming
transmission in a particular TTI, or may be a virtual PHR generated
for a TTI during which no uplink signal (e.g., PUCCH or PUSCH) is
scheduled for transmission. A UE 115 may calculate a PH value for a
hypothetical uplink transmission to generate the virtual PHR. The
hypothetical transmission may have a particular format (e.g.,
hypothetical PUCCH and/or PUSCH format), use a particular number of
resource blocks (e.g., one or more resource blocks), or the
like.
[0112] A UE 115 may generate a PHR based on scheduled uplink
transmissions that are performed during a given TTI, virtual
transmissions corresponding to a given TTI, or both actual and
virtual transmissions across one or more TTIs. For example, with
reference to FIG. 3, a UE 115 may determine that an uplink
transmission (e.g., PUSCH or PUCCH) is scheduled to be transmitted
during LTE subframe 305, and that an uplink transmission is
scheduled in each of NR slots 315-a, 315-b. UE 115 may calculate a
PH value for the LTE subframe 305, and PH value for each of the NR
slots 315-a, 315-b. Because the duration of a NR slot 315 is
shorter than the duration of the LTE subframe 305, the UE 115 may
calculate a PH value for each NR slot 315-a, 315-b, and optionally
may combine the PH values. In an example, the UE 115-a may
determine a value that is a function of the PH values for each of
the NR slots 315-a, 315-b. The function may be an average or other
statistic metric of the PH values calculated for each of the NR
slots 315-a, 315-b. In another example, the function may be a
maximum or minimum of the PH values calculated for the NR slots
315-a, 315-b. In this example, the UE 115 may be scheduled to send
a PHR for the LTE RAT. The UE 115 may generate a PHR for the LTE
RAT that includes the PH value calculated for the LTE subframe 305,
and a CPHR for the NR RAT that is the function of the PH values for
the NR slots 315-a, 315-b.
[0113] In some examples, the UE 115 may generate the CPHR that
includes PH values for less than all of the TTIs. In an example, UE
115 may select, or the base station 105 may configure the UE 115 to
select, one of the TTIs as a reference TTI. For example, one of NR
slots 315-a, 315-b may be selected as a reference NR slot. For
instance, UE 115 may select NR slot 315-a as the reference NR slot.
UE 115 may calculate a PH value for the reference NR slot 315, and
ignore the NR slot 315-b in the PH calculation. In this example,
the CPHR for the NR RAT may include the PH value for the reference
NR slot 315-a.
[0114] In some examples, the UE 115 may generate the CPHR using one
or more TTIs that have a scheduled transmission. For example, UE
115 may determine that only one of NR slots 315-a, 315-b has a
scheduled uplink transmission. For example, an uplink transmission
may be scheduled in NR slot 315-a, but not in NR slot 315-b. UE 115
may calculate a PH value based on the scheduled uplink transmission
in NR slot 315-a, and may skip calculating a power headroom value
for NR slot 315-b.
[0115] In some examples, the UE 115 may generate the CPHR for all
NR slots regardless of whether each has a scheduled transmission.
In an example, UE 115 may calculate a PH value based on the
scheduled uplink transmission of NR slot 315-a, and may calculate a
virtual PH value based on hypothetical uplink transmission in NR
slot 315-b. UE 115 may determine a value that is a function of the
PH value for each of the NR slots 315-a, 315-b (e.g., average the
actual and virtual PHRs, a maximum PH value, a minimum PH value).
In some examples, the CPHR may include multiple PH values that may
be calculated on scheduled transmissions and/or using hypothetical
transmissions.
[0116] In some examples, UE 115 may determine that no uplink
transmission is scheduled in any of multiple TTIs. In such
examples, UE 115 may calculate virtual PH value for some or all of
the TTIs. In an example, UE 115 may determine a value that is a
function of the PH value for each of the NR slots 315-a, 315-b
(e.g., an average of the two virtual PHRs, a maximum PH value, a
minimum PH value). UE 115 may generate a CPHR that includes the
value that is a function of the PH value for each of the NR slots,
may include two or more virtual PH values, or any combination
thereof.
[0117] For each time at which a PHR is scheduled for a particular
RAT, a CPHR for the other RAT may be generated based on scheduled
or hypothetical uplink transmissions in the one or more RATs. The
UE 115 may transmit the PHR and one or more CPHRs together to a
base station 105, as depicted in FIG. 4. In some examples, more
than two RATs may be supported, or multiple TTIs may be supported
within the same RAT (e.g., sTTIs and TTIs corresponding to LTE
transmissions). In any such case, UE 115 may determine a PH value
for each RAT and/or TTI duration based on scheduled or hypothetical
transmissions. The UE 115 may transmit a CPHR that includes the PH
values when transmitting a scheduled PHR for a RAT. In some
examples, the PHR and/or CPHR may include a maximum available
transmission power of the UE 115, such that base station 105 may be
aware of UE 115 capabilities.
[0118] Base station 105 may receive the PHR and the CPHR, and may
determine a resource allocation for the UE 115 based thereon. Base
station 105 may transmit a resource grant to UE 115, optionally
adjusting the resource allocation (e.g., bandwidth) for subsequent
transmissions. For example, if UE 115 reports a high PH value
(e.g., the maximum transmission power is somewhat to significantly
higher than the estimated scheduled transmission power), then base
station 105 may has the option to allocate more resources (e.g.,
additional bandwidth) to UE 115 for subsequent transmissions. If UE
115 reports a low PH value (e.g., the maximum transmission power is
slightly more than the estimated desired bandwidth), then base
station 105 may decrease allocated resources to UE 115 for
subsequent transmissions. UE 115 may send uplink transmissions
using the allocated resources.
[0119] FIG. 5 illustrates an example of a process flow 500 that
supports power headroom report for LTE-NR co-existence in
accordance with various aspects of the present disclosure. In some
examples, process flow 500 may implement aspects of wireless
communications systems 100 and 200. In some examples, process flow
500 may include UE 115-b and base station 105-b, which may be
examples of corresponding devices discussed with reference to FIGS.
1-4.
[0120] At 505, base station 105-b may configure the UE 115-b to
transmit a PHR for each RAT on a specific reporting schedule. For
example, the base station 105-b may transmit at least one PHR
schedule to UE 115-b. UE 115-b may utilize the at least one PHR
schedule to determine when to send PHRs for the first RAT and when
to send PHRs for the second RAT.
[0121] At 510, UE 115-b may generate PHRs for the first RAT and the
second RAT based on the schedule set at 505. In the case that a PHR
is due for the first RAT, UE 115-b may determine a PH value as a
function of a maximum transmission power of the UE 115-b and an
estimated scheduled transmission power. The estimated scheduled
transmission power may be a function of scheduled transmission
power in a control channel of the first RAT, or a shared channel of
the first RAT, or a combination of both. In the case that a PHR is
due for a second RAT, the UE 115-b may generate a PHR for the
second RAT in a similar way. The PHR may include a virtual PH value
based on a hypothetical transmission and may specify a maximum
transmission power of the UE 115-b.
[0122] At 515, the UE 115-b may generate a companion power headroom
report CPHR. In the case that a PHR is due for the first RAT, the
UE 115-b may calculate a PH value for the second RAT as a function
of a maximum transmission power of the UE 115-b and an estimated
transmission power of the second RAT. The estimated transmission
power may be a function of scheduled transmission power in a
control channel of the second RAT, or a shared channel of the
second RAT, or any combination thereof. In the case that a PHR is
due for a second RAT, the UE 115-b may generate a CPHR for the
first RAT in a similar way. The CPHR may include a virtual PH
value. The CPHR may include a maximum transmission power of the UE
115-b. In some examples, the first and second RAT may utilize
different numerologies where a duration of a set of TTIs of the
second RAT may correspond to a duration of a single TTI (e.g., the
TTI of the first RAT). In some examples, the UE 115-b may determine
an average PH for the two or more of the multiple TTIs, wherein the
companion PHR includes the average PH. In another example, the UE
115-b may identify a reference TTI in the two or more of the
multiple TTIs and then determine PH for the reference TTI. The
companion PHR may include the PH value for the reference TTI. In
some cases, the UE 115-b may determine PH value for each of the set
of TTIs, and may include the determined PH for each of the multiple
of TTIs in the CPHR.
[0123] In another case, the UE 115-b may determine that a first TTI
of multiple TTIs includes a scheduled transmission and that a
second TTI of the multiple f TTIs does not include a scheduled
transmission. The UE 115-b may calculate a PH value for the first
TTI. The companion PHR may include the determined PH for the first
TTI. In another example, the UE 115-b may determine a virtual PH
value for the second TTI. The CPHR may also include the virtual PH
value for the second TTI.
[0124] At 520, UE 115-b may transmit a PHR and a CPHR to the base
station 105-b. When a PHR is scheduled for the first RAT, the base
station 105-b may receive a PHR for the first RAT and a companion
PHR for the second RAT. When a PHR is scheduled for the second RAT,
the base station 105-b may receive a PHR for the second RAT and a
CPHR for the first RAT.
[0125] At 525, the base station 105-b may determine resource
allocation based on the PHR and the CPHR. For example, base station
105-b may adjust a bandwidth allocation for one or both of the
RATs. At 530, the base station 105-b may transmit a grant to the UE
115-b that may or might not change a resource allocation, and the
UE 115-b may use the allocated resources to transmit to the base
station 105-b at 535. The process flow 500 may repeat one or more
times.
[0126] FIG. 6 illustrates an example of a timing configuration 600
that supports power headroom report for LTE-NR co-existence in
accordance with various aspects of the present disclosure. In some
examples, techniques and devices described with reference to FIGS.
1-5 may implement aspects of timing configuration 600. In some
examples, a UE 115 may support joint power management that
dynamically splits transmission power between two or more RATs. In
such examples, UE 115 may dynamically share uplink transmission
power between uplink transmit channels corresponding to any number
of RATs.
[0127] A base station 105 may transmit an indication of a PHR type,
and the PHR type may identify the one or more channels for one or
more RATs on which the UE 115 is to calculate PH. UE 115 may
receive the indication, and may generate a joint PHR based on the
identified channels and/or RATs corresponding to the type. If UE
115 receives a PHR type that indicates only LTE channels, then the
UE 115 may determine PH for the data and/or control channels in
LTE. For example, the UE 115 may determine a power headroom value
as a difference between a maximum transmission power of the UE 115
and a total of the scheduled transmission power for the data and/or
control channels. If UE 115 receives a PHR type that indicates only
NR channels, then the UE 115 may determine PH for the data and/or
control channels in NR. For example, the UE 115 may determine a
power headroom value as a difference between a maximum transmission
power of the UE 115 and a total of the scheduled transmission power
for the data and/or control channels. If UE 115 receives a PHR type
that includes both NR and LTE channels, UE 115 may determine power
headroom value as a difference between a maximum transmission power
of the UE 115 and a total of the scheduled transmission power for
the data and/or control channels in NR and LTE.
[0128] The UE 115 may calculate power headroom for any number of
channels for any number of RATs. The UE 115 may determine a total
amount of the scheduled amount of transmission power in each
channel, and calculate a PH value by subtracting the total from the
maximum transmission power of the UE 115. In an example, a first PH
type may instruct the UE 115 to determine a PH value for a LTE
PUSCH transmission. UE 115 may determine a PH value by subtracting
the estimated power for the PUSCH transmission from the maximum
transmission power of the UE 115. In another example, a second PH
type may instruct the UE 115 to determine a PH value for a LTE
PUSCH transmission and a LTE PUCCH transmission. In such an
example, the UE 115 may determine a PH value by subtracting a total
of the estimated PUSCH transmission power and the estimated PUCCH
transmission power from the maximum transmission power of the UE
115.
[0129] Below are examples of PH types, and additional PH types may
be defined for these or other RATs. A third PH type may instruct
the UE 115 to determine a PH value for a LTE PUSCH transmission and
a NR PUSCH transmission. A fourth PH type may instruct the UE 115
to determine a PH value for a LTE PUSCH transmission and a NR PUCCH
transmission. A fifth PH type may instruct the UE 115 to determine
a PH value for a LTE PUSCH transmission, a NR PUCCH transmission,
and a NR PUSCH transmission. A sixth PH type may instruct the UE
115 to determine a PH value for a LTE PUSCH transmission, a LTE
PUCCH transmission, and a NR PUSCH transmission. A seventh PH type
may instruct the UE 115 to determine a PH value for a LTE PUSCH, a
LTE PUCCH transmission, and a NR PUCCH transmission. An eighth PH
type may instruct the UE 115 to determine a PH value for a LTE
PUSCH transmission, a LTE PUCCH transmission, a NR PUSCH
transmission, and a NR PUCCH transmission. A ninth PH type may
instruct the UE 115 to determine a PH value for a LTE PUSCH
transmission, an NR PUSCH transmission, and a LTE sTTI
transmission. A tenth PH type may instruct the UE 115 to determine
a PH value for a LTE PUSCH transmission, a NR PUCCH transmission,
and a LTE sTTI transmission. An eleventh PH type may instruct the
UE 115 to determine a PH value for a LTE PUSCH transmission, a NR
PUCCH transmission, a NR PUSCH transmission, and a LTE sTTI
transmission. A twelfth PH type may instruct the UE 115 to
determine a PH value for a LTE PUSCH transmission, a LTE PUCCH
transmission, a NR PUSCH transmission, and a LTE sTTI transmission.
A thirteenth PH type may instruct the UE 115 to determine a PH
value for a LTE PUSCH transmission, a LTE PUCCH transmission, a NR
PUCCH transmission, and a LTE sTTI transmission. A fourteenth PH
type may instruct the UE 115 to determine a PH value for a LTE
PUSCH transmission, a LTE PUCCH transmission, a NR PUSCH
transmission, a NR PUCCH transmission, and a LTE sTTI
transmission.
[0130] In some examples, a base station 105 may transmit a second
message including a second indication of a second PHR type that may
be different than the first PHR type. The second PHR type may
identify the one or more channels for one or more RATs on which the
UE 115 is to calculate a second PH. UE 115 may receive the
indication, and may generate a joint PHR based on the identified
channels and/or RATs corresponding to the second PHR type. UE 115
may determine power headroom value as a difference between a
maximum transmission power of the UE 115 and a total of the
scheduled transmission power for the data and/or control channels
in NR and/or LTE. UE 115 may determine a second joint PHR based on
the second PHR type, and may transmit the second joint PHR to base
station 105. Base station 105 may determine whether to adjust
allocated resources based on the second joint PHR.
[0131] UE 115 may determine when to send a joint PHR based on the
granularity of TTI durations of the supported RATs. A supported RAT
may have PHR reporting periodicity that corresponds to the TTI
duration of the RAT. Thus, a RAT with a longer TTI duration may
have a longer periodicity. A UE 115 may determine a PHR reporting
timeline (e.g., a PHR schedule) corresponding to the shorter of the
TTI durations of the multiple supported RATs. For instance, UE 115
may base a PHR schedule on periodicity of the shortest TTI duration
(e.g., LTE sTTI 620). The shortest TTI duration may correspond to
the shortest periodicity as to when the UE 115 is configured to
send a PHR.
[0132] In some examples, a UE 115 may support multiple RATs that
have different numerologies and TTI durations. In some examples,
even within a single RAT, TTI duration may vary. For instance, an
LTE sub-frame 605 may have a first TTI duration 610 (e.g., 1 ms),
and sTTIs in LTE may have a TTI duration 620 that is shortest than
TTI duration 610. LTE sTTIs 615 and 625 may be utilized for certain
types of communication (e.g., ultra-reliable low latency
communication (URLLC)), A NR slot 635 or NR slot 645 may have a
second TTI duration 640 (e.g., 0.5 ms) that is less than the first
TTI duration 610. In addition, LTE sTTIs 615 and 625 may have a TTI
duration 620 that is shorter than TTI duration 640. In some cases,
an NR mini slot (not shown) may have a TTI duration even shorter
than duration 620. As shown in FIG. 6, the boundaries of the
varying TTIs may not be aligned in some scenarios. A periodicity
corresponding to the shortest TTI duration of the multiple RATs
(e.g. TTI duration 620 corresponding to LTE sTTI 615) may be the
shortest periodicity of the multiple supported RATs. UE 115 may
determine a schedule of when to send a joint PHR based on the
periodicity corresponding to the shortest TTI duration, and may
transmit joint PHRs based on or at this shortest periodicity. Base
station 105 may determine resource allocation for subsequent
transmissions based on the joint PHR. UE 115 may receive a grant
including the allocated resources, and may send an uplink
transmission based thereon.
[0133] FIG. 7 illustrates an example of a timing diagram 700 that
supports power headroom report for LTE-NR co-existence in
accordance with various aspects of the present disclosure. In some
examples, techniques and devices described with reference to FIGS.
1-6 may implement aspects of timing diagram 700. As discussed with
reference to FIG. 6, different RATs may correspond to different TTI
durations, and TTI durations may vary within the same RAT. For
example, an LTE PHR schedule utilizing sTTIs (for URLLC
communications or other applications that require sTTIs) may
include PHRs for sTTI 705-a and 705-b. UE 115 may be scheduled to
send sTTI PHRs in sTTIs 705-a, 705-b that occur with periodicity
710. UE 115 may be scheduled to send NR PHRs in NR slots 715-a, and
NR slot 715-b, that occur with periodicity 720, which may be
greater than the periodicity 710. UE 115 may be scheduled to send
LTE PHRs in LTE subframes 725-a, 725-b that occur with periodicity
730. In some cases, periodicity 730 have a longer duration than
both periodicities 720 and 710. A UE 115 that supports multiple TTI
durations may determine a periodicity with which to send joint PHRs
based on the RAT having with the shortest TTI duration (and
therefore the shortest periodicity). For instance, a UE that
supports communication on sTTIs, NR slots, and LTE subframe may
determine a joint PHR schedule based on periodicity 710. Base
station 105 may determine resource allocation for subsequent
transmissions based on the joint PHR. UE 115 may receive a grant
including the allocated resources, and may send an uplink
transmission based thereon.
[0134] FIG. 8 illustrates an example of a process flow 800 that
supports power headroom report for LTE-NR co-existence in
accordance with various aspects of the present disclosure. In some
examples, techniques described with reference to FIGS. 1-7 may
implement aspects of process flow 800. Base station 105-c and UE
115-c may be examples of corresponding devices discussed with
respect to wireless communications systems 100 and 200, and process
flow 500.
[0135] At 805, the base station 105-c may send a PH type message to
the UE 115-c. The message may specify a PH type corresponding to at
least one channel of the first RAT and at least one channel of the
second RAT. At 810, The UE 115-c may identify the channels
specified by the received PH type.
[0136] At 815, the UE 115-c may generate a joint PHR based on the
received PHR type. Since the first and second RAT may use different
numerology, a schedule for reporting the joint PH may correspond to
a shorter of the first TTI duration and the second TTI duration.
The first TTI duration or the second TTI duration may correspond to
a duration of a short TTI (sTTI) or a mini-slot. The UE 115-c may
calculate a PH value as a function of a maximum transmission power
of the UE 115-c and an estimated transmission power, wherein the
estimated transmission power is a function of scheduled
transmission power in a control channel of the first RAT, or a
shortened TTI of the first RAT, or a control channel of the second
RAT, or a shared channel of the first RAT, or a shared channel of
the second RAT, or a combination. The joint PHR may include the
calculated PH and a maximum transmission power of the UE 115-c.
[0137] At 820, the UE 115-c may transmit the joint PHR to the base
station 105-c. At 825, the base station 105-c may determine whether
or not to adjust resources based on the joint PHR (e.g., increase
or decrease amount of allocated bandwidth). At 830, the base
station 105-c may transmit a grant to the UE 115-c indicating
resources that have been allocated to the UE 115-c, and may or
might not indicate a change in allocated resources from a prior
grant (e.g., a changed or unchanged bandwidth). The UE 115-c may
transmit an uplink signal to the base station 105-c at 835 based on
the grant. The process 800 may repeat one or more times.
[0138] FIG. 9 shows a block diagram 900 of a wireless device 905
that supports power headroom report for LTE-NR co-existence in
accordance with aspects of the present disclosure. Wireless device
905 may be an example of aspects of a user equipment (UE) 115 as
described herein. Wireless device 905 may include receiver 910, UE
communications manager 915, and transmitter 920. Wireless device
905 may also include a processor. Each of these components may be
in communication with one another (e.g., via one or more
buses).
[0139] Receiver 910 may receive information such as packets, user
data, or control information associated with various information
channels (e.g., control channels, data channels, and information
related to power headroom report for LTE-NR co-existence, etc.).
Information may be passed on to other components of the device. The
receiver 910 may be an example of aspects of the transceiver 1235
described with reference to FIG. 12. The receiver 910 may utilize a
single antenna or a set of antennas.
[0140] UE communications manager 915 may be an example of aspects
of the UE communications manager 1215 described with reference to
FIG. 12. UE communications manager 915 and/or at least some of its
various sub-components 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 of
the UE communications manager 915 and/or at least some of its
various sub-components may be executed by a general-purpose
processor, a digital signal processor (DSP), an
application-specific integrated circuit (ASIC), an
field-programmable gate array (FPGA) or other programmable logic
device, discrete gate or transistor logic, discrete hardware
components, or any combination thereof designed to perform the
functions described in the present disclosure. The UE
communications manager 915 and/or at least some of its various
sub-components may be physically located at various positions,
including being distributed such that portions of functions are
implemented at different physical locations by one or more physical
devices. In some examples, UE communications manager 915 and/or at
least some of its various sub-components may be a separate and
distinct component in accordance with various aspects of the
present disclosure. In other examples, UE communications manager
915 and/or at least some of its various sub-components may be
combined with one or more other hardware components, including but
not limited to an I/O component, a transceiver, a network server,
another computing device, one or more other components described in
the present disclosure, or a combination thereof in accordance with
various aspects of the present disclosure.
[0141] UE communications manager 915 may determine a first power
headroom reporting schedule for the first RAT, and a second power
headroom reporting schedule for a second RAT different from the
first power headroom reporting schedule, generate a PHR for the
first RAT and a companion PHR for the second RAT, and transmit the
PHR and the companion PHR based on the first power headroom
reporting schedule. The UE communications manager 915 may also
receive a signal specifying a PHR type, the PHR type associated
with at least one channel of a first RAT and at least one channel
of a second RAT, generate a joint PHR for the at least one channel
of the first RAT and the at least one channel of the second RAT
according to the PHR type, and transmit the joint PHR.
[0142] Transmitter 920 may transmit signals generated by other
components of the device. In some examples, the transmitter 920 may
be collocated with a receiver 910 in a transceiver module. For
example, the transmitter 920 may be an example of aspects of the
transceiver 1235 described with reference to FIG. 12. The
transmitter 920 may utilize a single antenna or a set of
antennas.
[0143] FIG. 10 shows a block diagram 1000 of a wireless device 1005
that supports power headroom report for LTE-NR co-existence in
accordance with aspects of the present disclosure. Wireless device
1005 may be an example of aspects of a wireless device 905 or a UE
115 as described with reference to FIG. 9. Wireless device 1005 may
include receiver 1010, UE communications manager 1015, and
transmitter 1020. Wireless 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).
[0144] Receiver 1010 may receive information such as packets, user
data, or control information associated with various information
channels (e.g., control channels, data channels, and information
related to power headroom report for LTE-NR co-existence, etc.).
Information may be passed on to other components of the device. The
receiver 1010 may be an example of aspects of the transceiver 1235
described with reference to FIG. 12. The receiver 1010 may utilize
a single antenna or a set of antennas.
[0145] UE communications manager 1015 may be an example of aspects
of the UE communications manager 1215 described with reference to
FIG. 12. UE communications manager 1015 may also include scheduling
component 1025, PHR component 1030, PHR type component 1035, and
joint PHR component 1040.
[0146] Scheduling component 1025 may determine a first power
headroom reporting schedule for the first RAT, and a second power
headroom reporting schedule for a second RAT different from the
first power headroom reporting schedule, determine that two or more
of the set of TTIs each include a scheduled transmission, and
determine a PHR reporting timeline corresponding to a shorter of
the first TTI duration and the second TTI duration, where
transmitting the joint PHR is based on the determined PHR reporting
timeline.
[0147] PHR component 1030 may generate a PHR for the first RAT and
a companion PHR for the second RAT, transmit the PHR and the
companion PHR based on the first power headroom reporting schedule,
determine power headroom for each of the set of TTIs, where the
companion PHR includes the determined power headroom for the each
of the set of TTIs, determine power headroom for the first TTI,
where the companion PHR includes the determined power headroom for
the first TTI, generate a PHR for the second RAT and a companion
PHR for the first RAT, and transmit the PHR for the second RAT and
the companion PHR for the first RAT based on the second power
headroom reporting schedule.
[0148] In some cases, generating the PHR includes: determining
power headroom as a function of a maximum transmission power of the
UE and an estimated transmission power, where the estimated
transmission power is a function of scheduled transmission power in
a control channel of the first RAT, or a shared channel of the
first RAT, or any combination thereof. In some cases, generating
the companion PHR includes: determining power headroom as a
function of a maximum transmission power of the UE and an estimated
transmission power, where the estimated transmission power is a
function of scheduled transmission power in a control channel of
the second RAT, or a shared channel of the second RAT, or any
combination thereof. In some cases, at least one of the PHR or the
companion PHR includes a maximum transmission power of the UE. In
some cases, the PHR for the first RAT and the companion PHR for the
second RAT are configured based on a semi-static power split
between the first RAT and the second RAT.
[0149] PHR type component 1035 may receive a signal specifying a
PHR type, the PHR type associated with at least one channel of a
first RAT and at least one channel of a second RAT.
[0150] Joint PHR component 1040 may generate a joint PHR for the at
least one channel of the first RAT and the at least one channel of
the second RAT according to the PHR type and transmit the joint
PHR. In some cases, generating the joint PHR further includes:
determining power headroom as a function of a maximum transmission
power of the UE and an estimated transmission power, where the
estimated transmission power is a function of scheduled
transmission power in a control channel of the first RAT, or a
shortened TTI of the first RAT, or a control channel of the second
RAT, or a shared channel of the first RAT, or a shared channel of
the second RAT, or any combination thereof. In some cases, the
joint PHR includes a maximum transmission power of the UE.
[0151] Transmitter 1020 may transmit signals generated by other
components of the device. In some examples, the transmitter 1020
may be collocated with a receiver 1010 in a transceiver module. For
example, the transmitter 1020 may be an example of aspects of the
transceiver 1235 described with reference to FIG. 12. The
transmitter 1020 may utilize a single antenna or a set of
antennas.
[0152] FIG. 11 shows a block diagram 1100 of a UE communications
manager 1115 that supports power headroom report for LTE-NR
co-existence in accordance with aspects of the present disclosure.
The UE communications manager 1115 may be an example of aspects of
a UE communications manager 915, a UE communications manager 1015,
or a UE communications manager 1215 described with reference to
FIGS. 9, 10, and 12. The UE communications manager 1115 may include
scheduling component 1120, PHR component 1125, PHR type component
1130, joint PHR component 1135, duration component 1140, average PH
component 1145, reference TTI component 1150, TTI determination
component 1155, virtual PH component 1160, and numerology component
1165. Each of these modules may communicate, directly or
indirectly, with one another (e.g., via one or more buses).
[0153] Scheduling component 1120 may determine a first power
headroom reporting schedule for the first RAT, and a second power
headroom reporting schedule for a second RAT different from the
first power headroom reporting schedule, determine that two or more
of the set of TTIs each include a scheduled transmission, and
determine a PHR reporting timeline corresponding to a shorter of
the first TTI duration and the second TTI duration, where
transmitting the joint PHR is based on the determined PHR reporting
timeline.
[0154] PHR component 1125 may generate a PHR for the first RAT and
a companion PHR for the second RAT, transmit the PHR and the
companion PHR based on the first power headroom reporting schedule,
determine power headroom for each of the set of TTIs, where the
companion PHR includes the determined power headroom for the each
of the set of TTIs, determine power headroom for the first TTI,
where the companion PHR includes the determined power headroom for
the first TTI, generate a PHR for the second RAT and a companion
PHR for the first RAT, and transmit the PHR for the second RAT and
the companion PHR for the first RAT based on the second power
headroom reporting schedule.
[0155] In some cases, generating the PHR includes: determining
power headroom as a function of a maximum transmission power of the
UE and an estimated transmission power, where the estimated
transmission power is a function of scheduled transmission power in
a control channel of the first RAT, or a shared channel of the
first RAT, or any combination thereof. In some cases, generating
the companion PHR includes: determining power headroom as a
function of a maximum transmission power of the UE and an estimated
transmission power, where the estimated transmission power is a
function of scheduled transmission power in a control channel of
the second RAT, or a shared channel of the second RAT, or any
combination thereof. In some cases, at least one of the PHR or the
companion PHR includes a maximum transmission power of the UE. In
some cases, the PHR for the first RAT and the companion PHR for the
second RAT are configured based on a semi-static power split
between the first RAT and the second RAT.
[0156] PHR type component 1130 may receive a signal specifying a
PHR type, the PHR type associated with at least one channel of a
first RAT and at least one channel of a second RAT.
[0157] Joint PHR component 1135 may generate a joint PHR for the at
least one channel of the first RAT and the at least one channel of
the second RAT according to the PHR type and transmit the joint
PHR. In some cases, generating the joint PHR further includes:
determining power headroom as a function of a maximum transmission
power of the UE and an estimated transmission power, where the
estimated transmission power is a function of scheduled
transmission power in a control channel of the first RAT, or a
shortened TTI of the first RAT, or a control channel of the second
RAT, or a shared channel of the first RAT, or a shared channel of
the second RAT, or any combination thereof. In some cases, the
joint PHR includes a maximum transmission power of the UE.
[0158] Duration component 1140 may determine that the first RAT and
the second RAT may communicate using different numerologies. In
some cases, a duration of a set of TTIs of the second RAT
corresponds to a duration of a single TTI of the first RAT. Average
PH component 1145 may determine average power headroom for the two
or more of the set of TTIs, where the companion PHR includes the
average power headroom. Reference TTI component 1150 may identify a
reference TTI in the two or more of the set of TTIs and determine
power headroom for the reference TTI, where the companion PHR
includes the power headroom for the reference TTI.
[0159] TTI determination component 1155 may determine that a first
TTI of the set of TTIs includes a scheduled transmission and that a
second TTI of the set of TTIs does not include a scheduled
transmission. In some cases, the first TTI duration or the second
TTI duration corresponds to a duration of a short TTI (sTTI) or a
mini-slot.
[0160] Virtual PH component 1160 may determine virtual power
headroom for the second TTI, where the companion PHR includes the
virtual power headroom for the second TTI. In some cases, at least
one of the PHR or the companion PHR is a virtual PHR. In some
cases, determining the virtual power headroom for the second TTI
may include determining the virtual power headroom for the second
TTI based on a number of resource blocks. In some cases, the first
RAT and the second RAT communicate using different numerology. In
some cases, the first RAT and the second RAT communicate using
different numerology.
[0161] FIG. 12 shows a diagram of a system 1200 including a device
1205 that supports power headroom report for LTE-NR co-existence in
accordance with aspects of the present disclosure. Device 1205 may
be an example of or include the components of wireless device 905,
wireless device 1005, or a UE 115 as described above, e.g., with
reference to FIGS. 9 and 10. Device 1205 may include components for
bi-directional voice and data communications including components
for transmitting and receiving communications, including UE
communications manager 1215, processor 1220, memory 1225, software
1230, transceiver 1235, antenna 1240, and I/O controller 1245.
These components may be in electronic communication via one or more
buses (e.g., bus 1210). Device 1205 may communicate wirelessly with
one or more base stations 105.
[0162] Processor 1220 may include an intelligent hardware device,
(e.g., a general-purpose processor, a DSP, a central processing
unit (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, processor 1220 may be configured to operate a memory array
using a memory controller. In other cases, a memory controller may
be integrated into processor 1220. Processor 1220 may be configured
to execute computer-readable instructions stored in a memory to
perform various functions (e.g., functions or tasks supporting
power headroom report for LTE-NR co-existence).
[0163] Memory 1225 may include random access memory (RAM) and read
only memory (ROM). The memory 1225 may store computer-readable,
computer-executable software 1230 including instructions that, when
executed, cause the processor to perform various functions
described herein. In some cases, the memory 1225 may contain, among
other things, a basic input/output system (BIOS) which may control
basic hardware or software operation such as the interaction with
peripheral components or devices.
[0164] Software 1230 may include code to implement aspects of the
present disclosure, including code to support power headroom report
for LTE-NR co-existence. Software 1230 may be stored in a
non-transitory computer-readable medium such as system memory or
other memory. In some cases, the software 1230 may not be directly
executable by the processor but may cause a computer (e.g., when
compiled and executed) to perform functions described herein.
[0165] Transceiver 1235 may communicate bi-directionally, via one
or more antennas, wired, or wireless links as described above. For
example, the transceiver 1235 may represent a wireless transceiver
and may communicate bi-directionally with another wireless
transceiver. The transceiver 1235 may also include a modem to
modulate the packets and provide the modulated packets to the
antennas for transmission, and to demodulate packets received from
the antennas. In some cases, the wireless device may include a
single antenna 1240. However, in some cases the device may have
more than one antenna 1240, which may be capable of concurrently
transmitting or receiving multiple wireless transmissions.
[0166] I/O controller 1245 may manage input and output signals for
device 1205. I/O controller 1245 may also manage peripherals not
integrated into device 1205. In some cases, I/O controller 1245 may
represent a physical connection or port to an external peripheral.
In some cases, I/O controller 1245 may utilize an operating system
such as iOS.RTM., ANDROID.RTM., MS-DOS.RTM., MS-WINDOWS.RTM.,
OS/2.RTM., UNIX.RTM., LINUX.RTM., or another known operating
system. In other cases, I/O controller 1245 may represent or
interact with a modem, a keyboard, a mouse, a touchscreen, or a
similar device. In some cases, I/O controller 1245 may be
implemented as part of a processor. In some cases, a user may
interact with device 1205 via I/O controller 1245 or via hardware
components controlled by I/O controller 1245.
[0167] FIG. 13 shows a block diagram 1300 of a wireless device 1305
that supports power headroom report for LTE-NR co-existence in
accordance with aspects of the present disclosure. Wireless device
1305 may be an example of aspects of a base station 105 as
described herein. Wireless device 1305 may include receiver 1310,
base station communications manager 1315, and transmitter 1320.
Wireless device 1305 may also include a processor. Each of these
components may be in communication with one another (e.g., via one
or more buses).
[0168] Receiver 1310 may receive information such as packets, user
data, or control information associated with various information
channels (e.g., control channels, data channels, and information
related to power headroom report for LTE-NR co-existence, etc.).
Information may be passed on to other components of the device. The
receiver 1310 may be an example of aspects of the transceiver 1635
described with reference to FIG. 16. The receiver 1310 may utilize
a single antenna or a set of antennas.
[0169] Base station communications manager 1315 may be an example
of aspects of the base station communications manager 1615
described with reference to FIG. 16. Base station communications
manager 1315 and/or at least some of its various sub-components 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 of the base station
communications manager 1315 and/or at least some of its various
sub-components may be executed by a general-purpose processor, a
DSP, an ASIC, an FPGA or other programmable logic device, discrete
gate or transistor logic, discrete hardware components, or any
combination thereof designed to perform the functions described in
the present disclosure.
[0170] The base station communications manager 1315 and/or at least
some of its various sub-components may be physically located at
various positions, including being distributed such that portions
of functions are implemented at different physical locations by one
or more physical devices. In some examples, base station
communications manager 1315 and/or at least some of its various
sub-components may be a separate and distinct component in
accordance with various aspects of the present disclosure. In other
examples, base station communications manager 1315 and/or at least
some of its various sub-components may be combined with one or more
other hardware components, including but not limited to an I/O
component, a transceiver, a network server, another computing
device, one or more other components described in the present
disclosure, or a combination thereof in accordance with various
aspects of the present disclosure.
[0171] Base station communications manager 1315 may configure a UE
with a first power headroom reporting schedule for the first RAT
and a second power headroom reporting schedule for a second RAT,
receive a PHR for the first RAT and a companion PHR for a second
RAT based on the first power headroom reporting schedule, and
allocate resources to the UE based on the PHR for the first RAT and
the companion PHR for the second RAT. The base station
communications manager 1315 may also transmit a message specifying
a PHR type corresponding to at least one channel of the first RAT
and at least one channel of the second RAT, receive a joint PHR
based on the PHR type, and allocate resources to a UE based on the
joint PHR.
[0172] Transmitter 1320 may transmit signals generated by other
components of the device. In some examples, the transmitter 1320
may be collocated with a receiver 1310 in a transceiver module. For
example, the transmitter 1320 may be an example of aspects of the
transceiver 1635 described with reference to FIG. 16. The
transmitter 1320 may utilize a single antenna or a set of
antennas.
[0173] FIG. 14 shows a block diagram 1400 of a wireless device 1405
that supports power headroom report for LTE-NR co-existence in
accordance with aspects of the present disclosure. Wireless device
1405 may be an example of aspects of a wireless device 1305 or a
base station 105 as described with reference to FIG. 13. Wireless
device 1405 may include receiver 1410, base station communications
manager 1415, and transmitter 1420. Wireless device 1405 may also
include a processor. Each of these components may be in
communication with one another (e.g., via one or more buses).
[0174] Receiver 1410 may receive information such as packets, user
data, or control information associated with various information
channels (e.g., control channels, data channels, and information
related to power headroom report for LTE-NR co-existence, etc.).
Information may be passed on to other components of the device. The
receiver 1410 may be an example of aspects of the transceiver 1635
described with reference to FIG. 16. The receiver 1410 may utilize
a single antenna or a set of antennas.
[0175] Base station communications manager 1415 may be an example
of aspects of the base station communications manager 1615
described with reference to FIG. 16. Base station communications
manager 1415 may also include scheduling component 1425, PHR
component 1430, resource allocation component 1435, PHR type
component 1440, and joint PHR component 1445. Scheduling component
1425 may configure a UE with a first power headroom reporting
schedule for the first RAT and a second power headroom reporting
schedule for a second RAT.
[0176] PHR component 1430 may receive a PHR for the first RAT and a
companion PHR for a second RAT based on the first power headroom
reporting schedule and receive a PHR for the second RAT and a
companion PHR for the first RAT based on the second power headroom
reporting schedule.
[0177] Resource allocation component 1435 may allocate resources to
the UE based on the PHR for the first RAT and the companion PHR for
the second RAT, adjust a bandwidth allocation based on the PHR for
the first RAT and the companion PHR for the second RAT, determine
whether to adjust the allocated resources based on the PHR for the
second RAT and the companion PHR for the first RAT, allocate
resources to a UE based on the joint PHR, and determine whether to
adjust the allocated resources based on the second joint PHR.
[0178] PHR type component 1440 may transmit a message specifying a
PHR type corresponding to at least one channel of the first RAT and
at least one channel of the second RAT. Joint PHR component 1445
may receive a joint PHR based on the PHR type, transmit a second
message specifying a second PHR type that differs from the PHR
type, and receive a second joint PHR based on the second PHR
type.
[0179] Transmitter 1420 may transmit signals generated by other
components of the device. In some examples, the transmitter 1420
may be collocated with a receiver 1410 in a transceiver module. For
example, the transmitter 1420 may be an example of aspects of the
transceiver 1635 described with reference to FIG. 16. The
transmitter 1420 may utilize a single antenna or a set of
antennas.
[0180] FIG. 15 shows a block diagram 1500 of a base station
communications manager 1515 that supports power headroom report for
LTE-NR co-existence in accordance with aspects of the present
disclosure. The base station communications manager 1515 may be an
example of aspects of a base station communications manager 1615
described with reference to FIGS. 13, 14, and 16. The base station
communications manager 1515 may include scheduling component 1520,
PHR component 1525, resource allocation component 1530, PHR type
component 1535, and joint PHR component 1540. Each of these modules
may communicate, directly or indirectly, with one another (e.g.,
via one or more buses).
[0181] Scheduling component 1520 may configure a UE with a first
power headroom reporting schedule for the first RAT and a second
power headroom reporting schedule for a second RAT. PHR component
1525 may receive a PHR for the first RAT and a companion PHR for a
second RAT based on the first power headroom reporting schedule and
receive a PHR for the second RAT and a companion PHR for the first
RAT based on the second power headroom reporting schedule.
[0182] Resource allocation component 1530 may allocate resources to
the UE based on the PHR for the first RAT and the companion PHR for
the second RAT, adjust a bandwidth allocation based on the PHR for
the first RAT and the companion PHR for the second RAT, determine
whether to adjust the allocated resources based on the PHR for the
second RAT and the companion PHR for the first RAT, allocate
resources to the UE based on the joint PHR, and determine whether
to adjust the allocated resources based on the second joint
PHR.
[0183] PHR type component 1535 may transmit a message specifying a
PHR type corresponding to at least one channel of the first RAT and
at least one channel of the second RAT. Joint PHR component 1540
may receive a joint PHR based on the PHR type, transmit a second
message specifying a second PHR type that differs from the PHR
type, and receive a second joint PHR based on the second PHR
type.
[0184] FIG. 16 shows a diagram of a system 1600 including a device
1605 that supports power headroom report for LTE-NR co-existence in
accordance with aspects of the present disclosure. Device 1605 may
be an example of or include the components of base station 105 as
described above, e.g., with reference to FIG. 1. Device 1605 may
include components for bi-directional voice and data communications
including components for transmitting and receiving communications,
including base station communications manager 1615, processor 1620,
memory 1625, software 1630, transceiver 1635, antenna 1640, network
communications manager 1645, and inter-station communications
manager 1650. These components may be in electronic communication
via one or more buses (e.g., bus 1610). Device 1605 may communicate
wirelessly with one or more UEs 115.
[0185] Processor 1620 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, processor
1620 may be configured to operate a memory array using a memory
controller. In other cases, a memory controller may be integrated
into processor 1620. Processor 1620 may be configured to execute
computer-readable instructions stored in a memory to perform
various functions (e.g., functions or tasks supporting power
headroom report for LTE-NR co-existence).
[0186] Memory 1625 may include RAM and ROM. The memory 1625 may
store computer-readable, computer-executable software 1630
including instructions that, when executed, cause the processor to
perform various functions described herein. In some cases, the
memory 1625 may contain, among other things, a BIOS which may
control basic hardware or software operation such as the
interaction with peripheral components or devices.
[0187] Software 1630 may include code to implement aspects of the
present disclosure, including code to support power headroom report
for LTE-NR co-existence. Software 1630 may be stored in a
non-transitory computer-readable medium such as system memory or
other memory. In some cases, the software 1630 may not be directly
executable by the processor but may cause a computer (e.g., when
compiled and executed) to perform functions described herein.
[0188] Transceiver 1635 may communicate bi-directionally, via one
or more antennas, wired, or wireless links as described above. For
example, the transceiver 1635 may represent a wireless transceiver
and may communicate bi-directionally with another wireless
transceiver. The transceiver 1635 may also include a modem to
modulate the packets and provide the modulated packets to the
antennas for transmission, and to demodulate packets received from
the antennas.
[0189] In some cases, the wireless device may include a single
antenna 1640. However, in some cases the device may have more than
one antenna 1640, which may be capable of concurrently transmitting
or receiving multiple wireless transmissions. Network
communications manager 1645 may manage communications with the core
network (e.g., via one or more wired backhaul links). For example,
the network communications manager 1645 may manage the transfer of
data communications for client devices, such as one or more UEs
115.
[0190] Inter-station communications manager 1650 may manage
communications with other base station 105, and may include a
controller or scheduler for controlling communications with UEs 115
in cooperation with other base stations 105. For example, the
inter-station communications manager 1650 may coordinate scheduling
for transmissions to UEs 115 for various interference mitigation
techniques such as beamforming or joint transmission. In some
examples, inter-station communications manager 1650 may provide an
X2 interface within an LTE/LTE-A wireless communication network
technology to provide communication between base stations 105.
[0191] FIG. 17 shows a flowchart illustrating a method 1700 for
power headroom report for LTE-NR co-existence in accordance with
aspects of the present disclosure. The operations of method 1700
may be implemented by a UE 115 or its components as described
herein. For example, the operations of method 1700 may be performed
by a UE communications manager as described with reference to FIGS.
9 through 12. In some examples, a UE 115 may execute a set of codes
to control the functional elements of the device to perform the
functions described below. Additionally or alternatively, the UE
115 may perform aspects of the functions described below using
special-purpose hardware.
[0192] At block 1705 the UE 115 may determine a first power
headroom reporting schedule for the first RAT, and a second power
headroom reporting schedule for a second RAT different from the
first power headroom reporting schedule. The operations of block
1705 may be performed according to the methods described herein. In
certain examples, aspects of the operations of block 1705 may be
performed by a scheduling component as described with reference to
FIGS. 9 through 12.
[0193] At block 1710 the UE 115 may generate a PHR for the first
RAT and a companion PHR for the second RAT. The operations of block
1710 may be performed according to the methods described herein. In
certain examples, aspects of the operations of block 1710 may be
performed by a PHR component as described with reference to FIGS. 9
through 12.
[0194] At block 1715 the UE 115 may transmit the PHR and the
companion PHR based at least in part on the first power headroom
reporting schedule. The operations of block 1715 may be performed
according to the methods described herein. In certain examples,
aspects of the operations of block 1715 may be performed by a PHR
component as described with reference to FIGS. 9 through 12.
[0195] FIG. 18 shows a flowchart illustrating a method 1800 for
power headroom report for LTE-NR co-existence in accordance with
aspects of the present disclosure. The operations of method 1800
may be implemented by a UE 115 or its components as described
herein. For example, the operations of method 1800 may be performed
by a UE communications manager as described with reference to FIGS.
9 through 12. In some examples, a UE 115 may execute a set of codes
to control the functional elements of the device to perform the
functions described below. Additionally or alternatively, the UE
115 may perform aspects of the functions described below using
special-purpose hardware.
[0196] At block 1805 the UE 115 may determine a first power
headroom reporting schedule for the first RAT, and a second power
headroom reporting schedule for a second RAT different from the
first power headroom reporting schedule. The operations of block
1805 may be performed according to the methods described herein. In
certain examples, aspects of the operations of block 1805 may be
performed by a scheduling component as described with reference to
FIGS. 9 through 12.
[0197] At block 1810 the UE 115 may generate a PHR for the first
RAT and a companion PHR for the second RAT. The operations of block
1810 may be performed according to the methods described herein. In
certain examples, aspects of the operations of block 1810 may be
performed by a PHR component as described with reference to FIGS. 9
through 12.
[0198] At block 1815 the UE 115 may transmit the PHR and the
companion PHR based at least in part on the first power headroom
reporting schedule. The operations of block 1815 may be performed
according to the methods described herein. In certain examples,
aspects of the operations of block 1815 may be performed by a PHR
component as described with reference to FIGS. 9 through 12.
[0199] At block 1820 the UE 115 may a duration of a plurality of
TTIs of the second RAT corresponds to a duration of a single TTI of
the first RAT. The operations of block 1820 may be performed
according to the methods described herein. In certain examples,
aspects of the operations of block 1820 may be performed by a
duration component as described with reference to FIGS. 9 through
12. In some cases, a duration of a plurality of TTIs of the second
RAT corresponds to a duration of a single TTI of the first RAT.
[0200] FIG. 19 shows a flowchart illustrating a method 1900 for
power headroom report for LTE-NR co-existence in accordance with
aspects of the present disclosure. The operations of method 1900
may be implemented by a UE 115 or its components as described
herein. For example, the operations of method 1900 may be performed
by a UE communications manager as described with reference to FIGS.
9 through 12. In some examples, a UE 115 may execute a set of codes
to control the functional elements of the device to perform the
functions described below. Additionally or alternatively, the UE
115 may perform aspects of the functions described below using
special-purpose hardware.
[0201] At block 1905 the UE 115 may receive a signal specifying a
PHR type, the PHR type associated with at least one channel of a
first RAT and at least one channel of a second RAT. The operations
of block 1905 may be performed according to the methods described
herein. In certain examples, aspects of the operations of block
1905 may be performed by a PHR type component as described with
reference to FIGS. 9 through 12.
[0202] At block 1910 the UE 115 may generate a joint PHR for the at
least one channel of the first RAT and the at least one channel of
the second RAT according to the PHR type. The operations of block
1910 may be performed according to the methods described herein. In
certain examples, aspects of the operations of block 1910 may be
performed by a joint PHR component as described with reference to
FIGS. 9 through 12.
[0203] At block 1915 the UE 115 may transmit the joint PHR. The
operations of block 1915 may be performed according to the methods
described herein. In certain examples, aspects of the operations of
block 1915 may be performed by a joint PHR component as described
with reference to FIGS. 9 through 12.
[0204] FIG. 20 shows a flowchart illustrating a method 2000 for
power headroom report for LTE-NR co-existence in accordance with
aspects of the present disclosure. The operations of method 2000
may be implemented by a UE 115 or its components as described
herein. For example, the operations of method 2000 may be performed
by a UE communications manager as described with reference to FIGS.
9 through 12. In some examples, a UE 115 may execute a set of codes
to control the functional elements of the device to perform the
functions described below. Additionally or alternatively, the UE
115 may perform aspects of the functions described below using
special-purpose hardware.
[0205] At block 2005 the UE 115 may determine a PHR reporting
timeline corresponding to a shorter of the first TTI duration and
the second TTI duration, wherein transmitting the joint PHR is
based at least in part on the determined PHR reporting timeline.
The operations of block 2005 may be performed according to the
methods described herein. In certain examples, aspects of the
operations of block 2005 may be performed by a scheduling component
as described with reference to FIGS. 9 through 12.
[0206] At block 2010 the UE 115 may receive a signal specifying a
PHR type, the PHR type associated with at least one channel of a
first RAT and at least one channel of a second RAT. The operations
of block 2010 may be performed according to the methods described
herein. In certain examples, aspects of the operations of block
2010 may be performed by a PHR type component as described with
reference to FIGS. 9 through 12.
[0207] At block 2015 the UE 115 may generate a joint PHR for the at
least one channel of the first RAT and the at least one channel of
the second RAT according to the PHR type. The operations of block
2015 may be performed according to the methods described herein. In
certain examples, aspects of the operations of block 2015 may be
performed by a joint PHR component as described with reference to
FIGS. 9 through 12.
[0208] At block 2020 the UE 115 may transmit the joint PHR. The
operations of block 2020 may be performed according to the methods
described herein. In certain examples, aspects of the operations of
block 2020 may be performed by a joint PHR component as described
with reference to FIGS. 9 through 12.
[0209] FIG. 21 shows a flowchart illustrating a method 2100 for
power headroom report for LTE-NR co-existence in accordance with
aspects of the present disclosure. The operations of method 2100
may be implemented by a base station 105 or its components as
described herein. For example, the operations of method 2100 may be
performed by a base station communications manager as described
with reference to FIGS. 13 through 16. In some examples, a base
station 105 may execute a set of codes to control the functional
elements of the device to perform the functions described below.
Additionally or alternatively, the base station 105 may perform
aspects of the functions described below using special-purpose
hardware.
[0210] At block 2105 the base station 105 may configure a UE with a
first power headroom reporting schedule for the first RAT and a
second power headroom reporting schedule for a second RAT. The
operations of block 2105 may be performed according to the methods
described herein. In certain examples, aspects of the operations of
block 2105 may be performed by a scheduling component as described
with reference to FIGS. 13 through 16.
[0211] At block 2110 the base station 105 may receive a PHR for the
first RAT and a companion PHR for a second RAT based at least in
part on the first power headroom reporting schedule. The operations
of block 2110 may be performed according to the methods described
herein. In certain examples, aspects of the operations of block
2110 may be performed by a PHR component as described with
reference to FIGS. 13 through 16.
[0212] At block 2115 the base station 105 may allocate resources to
the UE based at least in part on the PHR for the first RAT and the
companion PHR for the second RAT. The operations of block 2115 may
be performed according to the methods described herein. In certain
examples, aspects of the operations of block 2115 may be performed
by a resource allocation component as described with reference to
FIGS. 13 through 16.
[0213] FIG. 22 shows a flowchart illustrating a method 2200 for
power headroom report for LTE-NR co-existence in accordance with
aspects of the present disclosure. The operations of method 2200
may be implemented by a base station 105 or its components as
described herein. For example, the operations of method 2200 may be
performed by a base station communications manager as described
with reference to FIGS. 13 through 16. In some examples, a base
station 105 may execute a set of codes to control the functional
elements of the device to perform the functions described below.
Additionally or alternatively, the base station 105 may perform
aspects of the functions described below using special-purpose
hardware.
[0214] At block 2205 the base station 105 may transmit a message
specifying a PHR type corresponding to at least one channel of the
first RAT and at least one channel of the second RAT. The
operations of block 2205 may be performed according to the methods
described herein. In certain examples, aspects of the operations of
block 2205 may be performed by a PHR type component as described
with reference to FIGS. 13 through 16.
[0215] At block 2210 the base station 105 may receive a joint PHR
based at least in part on the PHR type. The operations of block
2210 may be performed according to the methods described herein. In
certain examples, aspects of the operations of block 2210 may be
performed by a joint PHR component as described with reference to
FIGS. 13 through 16.
[0216] At block 2215 the base station 105 may allocate resources to
a UE based at least in part on the joint PHR. The operations of
block 2215 may be performed according to the methods described
herein. In certain examples, aspects of the operations of block
2215 may be performed by a resource allocation component as
described with reference to FIGS. 13 through 16.
[0217] It should be noted that the methods described above 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.
[0218] Techniques described herein may be used for various wireless
communications systems such as code division multiple access
(CDMA), time division multiple access (TDMA), frequency division
multiple access (FDMA), orthogonal frequency division multiple
access (OFDMA), single carrier frequency division multiple access
(SC-FDMA), and other systems. A CDMA system may implement a radio
technology such as CDMA2000, Universal Terrestrial Radio Access
(UTRA), etc. CDMA2000 covers IS-2000, IS-95, and IS-856 standards.
IS-2000 Releases may be commonly referred to as CDMA2000 1X, 1X,
etc. IS-856 (TIA-856) is commonly referred to as CDMA2000 1xEV-DO,
High Rate Packet Data (HRPD), etc. UTRA includes Wideband CDMA
(WCDMA) and other variants of CDMA. A TDMA system may implement a
radio technology such as Global System for Mobile Communications
(GSM).
[0219] An OFDMA system may implement a radio technology such as
Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), Institute of
Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE
802.16 (WiMAX), IEEE 802.20, Flash-OFDM, etc. UTRA and E-UTRA are
part of Universal Mobile Telecommunications System (UMTS). LTE and
LTE-A are releases of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS,
LTE, LTE-A, NR, and GSM are described in documents from the
organization named "3rd Generation Partnership Project" (3GPP).
CDMA2000 and UMB are described in documents from an organization
named "3rd Generation Partnership Project 2" (3GPP2). The
techniques described herein may be used for the systems and radio
technologies mentioned above as well as other systems and radio
technologies. While aspects of an LTE or an NR system may be
described for purposes of example, and LTE or NR terminology may be
used in much of the description, the techniques described herein
are applicable beyond LTE or NR applications.
[0220] A macro cell generally covers a relatively large geographic
area (e.g., several kilometers in radius) and may allow
unrestricted access by UEs 115 with service subscriptions with the
network provider. 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, etc.) frequency bands as macro cells. Small cells may
include pico cells, femto cells, and micro cells according to
various examples. A pico cell, for example, may cover a small
geographic area and may allow unrestricted access by UEs 115 with
service subscriptions with the network provider. A femto cell may
also cover a small geographic area (e.g., a home) and may provide
restricted access by UEs 115 having an association with the femto
cell (e.g., UEs 115 in a closed subscriber group (CSG), UEs 115 for
users in the home, and the like). An eNB for a macro cell may be
referred to as a macro eNB. An eNB for a small cell may be referred
to as a small cell eNB, a pico eNB, a femto eNB, or a home eNB. An
eNB may support one or multiple (e.g., two, three, four, and the
like) cells, and may also support communications using one or
multiple component carriers.
[0221] The wireless communications system 100 or systems described
herein may support synchronous or asynchronous operation. For
synchronous operation, the base stations 105 may have similar frame
timing, and transmissions from different base stations 105 may be
approximately aligned in time. For asynchronous operation, the base
stations 105 may have different frame timing, and transmissions
from different base stations 105 may not be aligned in time. The
techniques described herein may be used for either synchronous or
asynchronous operations.
[0222] 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
above description may be represented by voltages, currents,
electromagnetic waves, magnetic fields or particles, optical fields
or particles, or any combination thereof.
[0223] The various illustrative blocks and modules described in
connection with the disclosure herein may be implemented or
performed with a general-purpose processor, a digital signal
processor (DSP), an application-specific integrated circuit (ASIC),
a field-programmable gate array (FPGA) or other programmable logic
device (PLD), discrete gate or transistor logic, discrete hardware
components, or any combination thereof designed to perform the
functions described herein. A general-purpose processor may be a
microprocessor, but in the alternative, the processor may be any
conventional processor, controller, microcontroller, or state
machine. A processor may also be implemented as a combination of
computing devices (e.g., a combination of a DSP and a
microprocessor, multiple microprocessors, one or more
microprocessors in conjunction with a DSP core, or any other such
configuration).
[0224] 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 above can be implemented using
software executed by a processor, hardware, firmware, hardwiring,
or combinations of any of these. Features implementing functions
may also be physically located at various positions, including
being distributed such that portions of functions are implemented
at different physical locations.
[0225] Computer-readable media includes both non-transitory
computer storage media and communication media including any medium
that facilitates transfer of a computer program from one place to
another. A non-transitory storage medium may be any available
medium that can be accessed by a general purpose or special purpose
computer. By way of example, and not limitation, non-transitory
computer-readable media may comprise random-access memory (RAM),
read-only memory (ROM), electrically erasable programmable read
only memory (EEPROM), flash memory, compact disk (CD) ROM or other
optical disk storage, magnetic disk storage or other magnetic
storage devices, or any other non-transitory medium that can be
used to carry or store desired program code means in the form of
instructions or data structures and that can be accessed by a
general-purpose or special-purpose computer, or a general-purpose
or special-purpose processor.
[0226] Also, any connection is properly termed a computer-readable
medium. For example, if the software is transmitted from a website,
server, or other remote source using a coaxial cable, fiber optic
cable, twisted pair, digital subscriber line (DSL), or wireless
technologies such as infrared, radio, and microwave, then the
coaxial cable, fiber optic cable, twisted pair, DSL, or wireless
technologies such as infrared, radio, and microwave are included in
the definition of medium. Disk and disc, as used herein, include
CD, laser disc, optical disc, digital versatile disc (DVD), floppy
disk and Blu-ray disc where disks usually reproduce data
magnetically, while discs reproduce data optically with lasers.
Combinations of the above are also included within the scope of
computer-readable media.
[0227] As used herein, including in the claims, the term "and/or,"
when used in a list of two or more items, means that any one of the
listed items can be employed by itself, or any combination of two
or more of the listed items can be employed. For example, if a
composition is described as containing components A, B, and/or C,
the composition can contain A alone; B alone; C alone; A and B in
combination; A and C in combination; B and C in combination; or A,
B, and C in combination. Also, as used herein, including in the
claims, "or" as used in a list of items (for example, 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
phrase referring to "at least one of" a list of items refers to any
combination of those items, including single members. As an
example, "at least one of: A, B, or C" is intended to cover A, B,
C, A-B, A-C, B-C, and A-B-C., as well as any combination with
multiples of the same element (e.g., A-A A-A-A, A-A-B, A-A-C,
A-B-B, A-C-C, B-B, B-B-B, B-B-C, C-C, and C-C-C or any other
ordering of A, B, and C). Also, as used herein, the phrase "based
on" shall not be construed as a reference to a closed set of
conditions. For example, an exemplary step that is described as
"based on condition A" may be based on both a condition A and a
condition B without departing from the scope of the present
disclosure. In other words, as used herein, the phrase "based on"
shall be construed in the same manner as the phrase "based at least
in part on."
[0228] 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.
[0229] The description set forth herein, in connection with the
appended drawings, describes example configurations and does not
represent all the examples that may be implemented or that are
within the scope of the claims. The term "exemplary" used herein
means "serving as an example, instance, or illustration," and not
"preferred" or "advantageous over other examples." The detailed
description includes specific details for the purpose of providing
an understanding of the described techniques. These techniques,
however, may be practiced without these specific details. In some
instances, well-known structures and devices are shown in block
diagram form in order to avoid obscuring the concepts of the
described examples.
[0230] The description herein is provided to enable a person
skilled in the art to make or use the disclosure. Various
modifications to the disclosure will be readily apparent to those
skilled in the art, and the generic principles defined herein may
be applied to other variations without departing from the scope of
the disclosure. Thus, the disclosure is not limited to the examples
and designs described herein, but is to be accorded the broadest
scope consistent with the principles and novel features disclosed
herein.
* * * * *