U.S. patent application number 17/317281 was filed with the patent office on 2021-09-02 for method and arrangement for power control handling.
The applicant listed for this patent is Telefonaktiebolaget LM Ericsson (PUBL). Invention is credited to Daniel Larsson, Imadur RAHMAN.
Application Number | 20210274450 17/317281 |
Document ID | / |
Family ID | 1000005583264 |
Filed Date | 2021-09-02 |
United States Patent
Application |
20210274450 |
Kind Code |
A1 |
Larsson; Daniel ; et
al. |
September 2, 2021 |
Method and Arrangement for Power Control Handling
Abstract
A network node, a wireless device and methods therein are
provided for handling transmit power control for contemporaneous
links related to multi-connectivity. A method in a network node
involves obtaining a separate maximum transmit power value for a
wireless device per contemporaneous link; and transmitting at least
one of the obtained maximum transmit power values to another
network node, thereby enabling the other network node to control
the transmit power of the wireless device for a link corresponding
to at least one of the obtained maximum transmit power values
Inventors: |
Larsson; Daniel;
(Vallentuna, SE) ; RAHMAN; Imadur; (Sollentuna,
SE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Telefonaktiebolaget LM Ericsson (PUBL) |
Stockholm |
|
SE |
|
|
Family ID: |
1000005583264 |
Appl. No.: |
17/317281 |
Filed: |
May 11, 2021 |
Related U.S. Patent Documents
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
|
|
14413780 |
Jan 9, 2015 |
11019581 |
|
|
PCT/SE2014/051126 |
Sep 26, 2014 |
|
|
|
17317281 |
|
|
|
|
61883395 |
Sep 27, 2013 |
|
|
|
61883420 |
Sep 27, 2013 |
|
|
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04W 52/281 20130101;
H04W 52/386 20130101; H04L 5/1469 20130101; H04L 5/001 20130101;
H04L 5/0048 20130101; H04W 52/245 20130101; H04W 52/241 20130101;
H04W 72/0473 20130101; H04W 52/38 20130101; H04L 5/0023 20130101;
H04W 52/367 20130101; H04W 52/365 20130101; H04W 72/12 20130101;
H04W 52/346 20130101 |
International
Class: |
H04W 52/38 20060101
H04W052/38; H04W 52/24 20060101 H04W052/24; H04W 52/34 20060101
H04W052/34; H04W 52/36 20060101 H04W052/36; H04W 52/28 20060101
H04W052/28; H04W 72/12 20060101 H04W072/12; H04W 72/04 20060101
H04W072/04 |
Claims
1. A method performed in a network node, for enabling transmit
power control of a wireless device that is configured to support
two or more contemporaneous links with two or more corresponding
wireless access points, the method comprising: obtaining (501, 601)
a separate maximum transmit power value for the wireless device per
contemporaneous link, and transmitting (502) at least one of the
obtained maximum transmit power values to another network node,
thereby enabling the other network node to control the transmit
power of the wireless device for a link corresponding to at least
one of the obtained maximum transmit power values.
2. The method according to claim 1, wherein the separate maximum
transmit power values are determined based on a total power
constraint for the wireless device.
3. The method according to claim 2, wherein the separate maximum
transmit power values are determined such that the sum of all the
separate maximum transmit power values does not exceed the maximum
allowed transmit power for the wireless device.
4. The method according to claim 2, wherein the separate maximum
transmit power values are determined such that the sum of all the
separate maximum transmit power values does not exceed the maximum
allowed transmit power for the wireless device minus a threshold
value.
5. The method according to any of claims 2-4, wherein the separate
maximum transmit power values are determined based on one or more
of: a power headroom report from the wireless device, information
on a Reference Signal Received Power, RSRP, or a Reference Signal
Received Quality, RSRQ, of the wireless device, a buffer status of
the wireless device, priority of a corresponding contemporaneous
link.
6. The method according to claim 5, wherein the separate maximum
transmit power values are determined based on one or more of the
following rules: determining a higher transmit power value for a
link with a larger corresponding buffer size, as compared to
another contemporaneous link; determining a higher transmit power
value for a link which has a higher priority, as compared to
another contemporaneous link; determining a higher transmit power
value for a link having a lower RSRP and/or RSRQ value, as compared
to another contemporaneous link.
7. The method according to any of claims 2-6, wherein different
maximum transmit power values for a link are determined for
different subframes and/or for different channels or signals.
8. The method according to any of claims 1-7, wherein the maximum
transmit power values are determined based on different criteria
during different time intervals.
9. The method according to claims 7 or 8, comprising determining a
time-varying pattern for the maximum transmit power value for one
or more of the contemporaneous links.
10. The method according to any of claims 1-9, wherein the network
node is a wireless access point.
11. The method according to any of the preceding claims, wherein
the network node is a Main eNB and the other network node is a
Secondary eNB.
12. The method according to any of the claims 1-10, wherein the
other network node is a Main eNB or a Secondary eNB.
13. The method according to any of the claims 10-12, further
comprising: signaling at least one of the obtained maximum transmit
power values to the wireless device.
14. The method according to any of claims 10-13, further
comprising: scheduling the wireless device in the uplink based on
the maximum transmit power value corresponding to the link between
the network node and the wireless device.
15. The method according to any of claims 10-14, further
comprising: receiving a power headroom report from the wireless
device; and scheduling the wireless device on one of the
contemporaneous links, based on the maximum transmit power for that
link, and the received power headroom report.
16. The method according to claim 15, further comprising
determining the actual power headroom available to the wireless
device for transmission on one of the contemporaneous links, based
on the received power headroom report and on the obtained maximum
transmit power value for that link.
17. The method according to any of the preceding claims wherein the
separate maximum transmit power values are determined by the
network node.
18. The method according to any of claims 1-16, wherein the
separate maximum transmit power value for the wireless device per
contemporaneous link are received from another network node.
19. A method performed in a network node, for controlling the
transmit power of a wireless device that is configured to support
two or more contemporaneous links with two or more corresponding
wireless access points, the method comprising: obtaining (601) a
separate maximum transmit power value for the wireless device per
contemporaneous link; and signaling (602) the separate maximum
transmit power values to the wireless device.
20. The method according to claim 19, wherein the separate maximum
transmit power values are determined based on a total power
constraint for the wireless device.
21. The method according to claim 20, wherein the separate maximum
transmit power values are determined such that the sum of all the
separate maximum transmit power values does not exceed the maximum
allowed transmit power for the wireless device.
22. The method according to claim 20, wherein the separate maximum
transmit power values are determined such that the sum of all the
separate maximum transmit power values does not exceed the maximum
allowed transmit power for the wireless device minus a threshold
value.
23. The method according to any of claims 20-22, wherein the
separate maximum transmit power values are determined based on one
or more of: a power headroom report from the wireless device,
information on a Reference Signal Received Power, RSRP, or a
Reference Signal Received Quality, RSRQ, of the wireless device, a
buffer status of the wireless device, priority of a corresponding
contemporaneous link.
24. The method according to claim 23, wherein the separate maximum
transmit power values are determined based on one or more of the
following rules: determining a higher transmit power value for a
link with a larger corresponding buffer size, as compared to
another contemporaneous link; determining a higher transmit power
value for a link which has a higher priority, as compared to
another contemporaneous link; determining a higher transmit power
value for a link having a lower RSRP and/or RSRQ value, as compared
to another contemporaneous link.
25. The method according to any of claims 20-24, wherein different
maximum transmit power values for a link are determined for
different subframes and/or for different channels or signals.
26. The method according to any of claims 20-25, wherein the
maximum transmit power values are determined based on different
criteria during different time intervals.
27. The method according to claims 25 or 26, comprising determining
a time-varying pattern for the maximum transmit power value for one
or more of the contemporaneous links.
28. The method according to any of claims 19-27, wherein the
network node is a wireless access point.
29. The method according to any claims 19-28, wherein the network
node is a Main eNB.
30. The method according to any of claims 28-29, further
comprising: scheduling the wireless device in the uplink based on
the maximum transmit power value corresponding to the link between
the network node and the wireless device.
31. The method according to any of claims 28-30, further
comprising: receiving a power headroom report from the wireless
device; and scheduling the wireless device on one of the
contemporaneous links, based on the maximum transmit power for that
link, and the received power headroom report.
32. The method according to claim 31, further comprising
determining the actual available power headroom available to the
wireless device for transmission on one of the contemporaneous
links, based on the received power headroom report and on the
obtained maximum transmit power value for that link.
33. The method according to any of the claims 19-32 wherein the
separate maximum transmit power values are determined by the
network node.
34. The method according to any of claims 19-32, wherein the
separate maximum transmit power value for the wireless device per
contemporaneous link are received from another network node.
35. A method performed in a network node for scheduling a wireless
device, the wireless device being configured to support two or more
contemporaneous links with two or more corresponding wireless
access points, the method comprising: obtaining (701, 801) a
separate maximum transmit power value for the wireless device per
contemporaneous link; receiving (703, 802) a power headroom report
from the wireless device; and scheduling (704, 804) the wireless
device on one of the contemporaneous links, based on the obtained
maximum transmit power value for that link, and on the received
power headroom report.
36. The method according to claim 35, further comprising
determining (804) the actual available power headroom available to
the wireless device for transmission on one of the contemporaneous
links, based on the received power headroom report and on the
obtained maximum transmit power value for that link.
37. The method according to claim 35 or 36, wherein scheduling the
wireless device on one of the contemporaneous links comprises
selecting one or more of the following parameters for the uplink
grant based on the obtained maximum transmit power value for that
link: amount of physical resource blocks assigned to the terminal,
a transport block size assigned to the terminal, a modulation and
coding scheme assigned to the terminal.
38. The method according to any of claims 35-37, wherein the
separate maximum transmit power values are determined based on a
total power constraint for the wireless device.
39. The method according to claim 38, wherein the separate maximum
transmit power values are determined such that the sum of all the
separate maximum transmit power values does not exceed the maximum
allowed transmit power for the wireless device.
40. The method according to claim 38, wherein the separate maximum
transmit power values are determined such that the sum of all the
separate maximum transmit power values does not exceed the maximum
allowed transmit power for the wireless device minus a threshold
value.
41. The method according to any of claims 35-40, wherein the
separate maximum transmit power values are further determined based
on one or more of: information on a Reference Signal Received
Power, RSRP, or a Reference Signal Received Quality, RSRQ, of the
wireless device, a buffer status of the wireless device, priority
of a corresponding contemporaneous link.
42. The method according to claim 41, wherein the separate maximum
transmit power values are determined based on one or more of the
following rules: determining a higher transmit power value for a
link with a larger corresponding buffer size, as compared to
another contemporaneous link; determining a higher transmit power
value for a link which has a higher priority, as compared to
another contemporaneous link; determining a higher transmit power
value for a link having a lower RSRP and/or RSRQ value, as compared
to another contemporaneous link.
43. The method according to any of claims 38-42, wherein different
maximum transmit power values for a link are determined for
different subframes and/or for different channels or signals.
44. The method according to any of claims 38-43, wherein the
maximum transmit power values are determined based on different
criteria during different time intervals.
45. The method according to claims 43 or 44, comprising determining
a time-varying pattern for the maximum transmit power value for one
or more links.
46. The method according to any of claims 35-45, wherein the
network node is a wireless access point.
47. The method according to any of the claims 35-46, wherein the
network node is a Main eNB.
48. The method according to any of claims 35-47, further comprising
determining the actual available power headroom available to the
wireless device for transmission on one of the contemporaneous
links, based on the received power headroom report and on the
obtained maximum transmit power value for that link.
49. The method according to any of the claims 35-48 wherein the
separate maximum transmit power values are determined by the
network node.
50. The method according to any of claims 35-49, wherein the
separate maximum transmit power value for the wireless device per
contemporaneous link are received from another network node.
51. A network node, for enabling transmit power control of a
wireless device that is configured to support two or more
contemporaneous links with two or more corresponding wireless
access points, the network node comprising processing means (10,
1503) and a memory (30, 1504) comprising instructions (1505), which
when executed by the processing means causes the network node (1,
1500) to: obtain a separate maximum transmit power value for the
wireless device per contemporaneous link, and to transmit at least
one of the obtained maximum transmit power values to another
network node, thereby enabling the other network node to control
the transmit power of the wireless device for a link corresponding
to at least one of the obtained maximum transmit power values.
52. The network node according to claim 51, wherein the execution
of the instructions further causes the network node to perform the
method according to any of the claims 2-18.
53. A network node, for transmit power control of a wireless device
that is configured to support two or more contemporaneous links
with two or more corresponding wireless access points, the network
node comprising processing means (10, 1503) and a memory (30, 1504)
comprising instructions (1505), which when executed by the
processing means causes the network node (1, 1500) to: obtain a
separate maximum transmit power value for the wireless device per
contemporaneous link; and to signal the separate maximum transmit
power values to the wireless device.
54. The network node according to claim 53, wherein the execution
of the instructions further causes the network node to perform the
method according to any of the claims 20-34.
55. A network node for scheduling a wireless device, the wireless
device being configured to support two or more contemporaneous
links with two or more corresponding wireless access points, the
network node comprising processing means (10, 1503) and a memory
(30, 1504) comprising instructions (1505), which when executed by
the processing means causes the network node (1, 1500) to: obtain a
separate maximum transmit power value for the wireless device per
contemporaneous link; receive a power headroom report from the
wireless device; and schedule the wireless device on one of the
contemporaneous links, based on the obtained maximum transmit power
value for that link, and on the received power headroom report.
56. The network node according to claim 55, wherein the execution
of the instructions further causes the network node to perform the
method according to any of the claims 36-50.
57. A method performed in a wireless device configured to support
two or more contemporaneous links with two or more corresponding
wireless access points, the method comprising: receiving (1001) a
separate maximum transmit power value for the wireless device for
each contemporaneous link; and applying (1003) power control to
transmissions on each contemporaneous link based on the maximum
transmit power value corresponding to the respective link.
58. The method according to claim 57, further comprising:
Determining (1002) that contemporaneous transmission will be
performed based on having received more than one uplink grant with
respect to a subframe k, and applying power control to
transmissions on each contemporaneous link in subframe k based on
the maximum transmit power value corresponding to the respective
link.
59. The method according to claim 57 or 58, further comprising
receiving an indication to vary one or more of the maximum transmit
power values according to a time pattern, and applying power
control to transmissions on the corresponding link or links
according to the time pattern.
60. A method performed in a wireless device configured to support
two or more contemporaneous links with two or more corresponding
wireless access points, the method comprising: receiving (1101) a
separate maximum transmit power value for each contemporaneous
link, and receiving (1102) an indication to vary one or more of the
maximum transmit power values according to a time pattern
61. A wireless device configured to support two or more
contemporaneous links with two or more corresponding wireless
access points, the wireless device comprising processing means
(1720, 1803) and a memory (1804) comprising instructions (1805),
which when executed by the processing means causes the wireless
device (1700, 1800) to: receive a separate maximum transmit power
value for each contemporaneous link, and apply power control to
transmissions on each contemporaneous link based on the maximum
transmit power value corresponding to the respective link
62. The wireless device according to claim 61, wherein the
execution of the instructions further causes the wireless device
to: determine that contemporaneous transmission will be performed
based on having received more than one uplink grant with respect to
a subframe k, and applying power control to transmissions on each
contemporaneous link in subframe k based on the maximum transmit
power value corresponding to the respective link.
63. The wireless device according to claim 61 or 62, wherein the
execution of the instructions further causes the wireless device
to: receive an indication to vary one or more of the maximum
transmit power values according to a time pattern; and to apply
power control to transmissions on the corresponding link or links
according to the time pattern.
64. A wireless device configured to support two or more
contemporaneous links with two or more corresponding wireless
access points, the wireless device comprising processing means
(1720, 1803) and a memory (1804) comprising instructions (1805),
which when executed by the processing means causes the wireless
device (1700, 1800) to: receive a separate maximum transmit power
value for each contemporaneous link, and to receive an indication
to vary one or more of the maximum transmit power values according
to a time pattern.
Description
TECHNICAL FIELD
[0001] The solution described herein relates generally to handling
of power control, and in particular to handling of transmit power
control for a wireless device at multi-connectivity.
BACKGROUND
[0002] The 3rd Generation Partnership Project (3GPP) is responsible
for the standardization of the Universal Mobile Telecommunication
System (UMTS) and Long Term Evolution (LTE). The 3GPP work on LTE
is also referred to as Evolved Universal Terrestrial Access Network
(E-UTRAN). LTE is a technology for realizing high-speed
packet-based communication that can reach high data rates both in
the downlink and in the uplink, and is thought of as a next
generation mobile communication system relative to UMTS. In order
to support high data rates, LTE allows for a system bandwidth of 20
MHz, or up to 100 Hz when carrier aggregation is employed. LTE is
also able to operate in different frequency bands and can operate
in at least Frequency Division Duplex (FDD) and Time Division
Duplex (TDD) modes.
[0003] LTE uses Orthogonal Frequency Division Multiplexing (OFDM)
in the downlink and Discrete Fourier Transform (DFT)-spread OFDM in
the uplink. The basic LTE downlink physical resource can thus be
seen as a time-frequency grid as illustrated in FIG. 1a, where each
resource element corresponds to one OFDM subcarrier during one OFDM
symbol interval.
[0004] In the time domain, LTE downlink transmissions are organized
into radio frames of 10 ms, each radio frame consisting of ten
equally-sized subframes of length T.sub.subframe=1 ms
[0005] Furthermore, the resource allocation in LTE is typically
described in terms of resource blocks, PRBs, where a resource block
corresponds to one slot, 0.5 ms, in the time domain and 12
contiguous subcarriers in the frequency domain. Resource blocks are
numbered in the frequency domain, starting with 0 from one end of
the system bandwidth.
[0006] Downlink transmissions are dynamically scheduled, i.e., in
each subframe the base station transmits control information
indicating to which terminals and on which resource blocks the data
is transmitted during the current downlink subframe. This control
signaling is typically transmitted in the first 1, 2, 3 or 4 OFDM
symbols in each subframe. A downlink system with 3 OFDM symbols as
control region is illustrated in FIG. 3
Physical Uplink Control Channel
[0007] LTE uses hybrid-Automatic Repeat Request (ARQ), where, after
receiving downlink data in a subframe, the terminal attempts to
decode it and reports to the base station whether the decoding was
successful (ACK) or not (NAK). In case of an unsuccessful decoding
attempt, the base station can retransmit the erroneous data.
[0008] Uplink control signaling from the terminal to the base
station comprises [0009] hybrid-ARQ acknowledgements for received
downlink data; [0010] terminal reports related to the downlink
channel conditions, used as assistance for the downlink scheduling;
also known as Channel Quality Indicator (CQI); [0011] scheduling
requests, indicating that a mobile terminal needs uplink resources
for uplink data transmissions.
[0012] If the mobile terminal has not been assigned an uplink
resource for data transmission, the Layer 1/Layer 2 (L1/L2) control
information, e.g. channel-status reports, hybrid-ARQ
acknowledgments, and scheduling requests, is transmitted in uplink
resources, i.e. resource blocks specifically assigned for uplink
L1/L2 control information on the Physical Uplink Control Channel
(PUCCH).
[0013] Different PUCCH formats are used for the different
information, e.g. PUCCH Format 1a/1b are used for hybrid-ARQ
feedback, PUCCH Format 2/2a/2b for reporting of channel conditions,
and PUCCH Format 1 for scheduling requests.
Physical Uplink Shared Channel
[0014] To transmit data in the uplink the mobile terminal has to be
assigned an uplink resource for data transmission, on the Physical
Uplink Shared Channel (PUSCH). In contrast to a data assignment in
downlink, in uplink the assignment must always be consecutive in
frequency, this to retain the signal carrier property of the uplink
as illustrated in FIG. 4. In Rel-10 this restriction may however be
relaxed enabling non-noncontiguous uplink transmissions.
[0015] The middle Single Carrier (SC)-symbol in each slot is used
to transmit a reference symbol. If the mobile terminal has been
assigned an uplink resource for data transmission and at the same
time instance has control information to transmit, it will transmit
the control information together with the data on PUSCH.
Uplink Power Control for PUSCH and PUCCH
[0016] Uplink power control is used both on the PUSCH and on PUCCH.
The purpose is to ensure that the mobile terminal transmits with
sufficiently high but not too high power since the latter would
increase the interference to other users in the network. In both
cases, a parameterized open loop combined with a closed loop
mechanism is used.
[0017] Roughly, the open loop part is used to set a point of
operation, around which the closed loop component operates.
Different parameters, e.g. targets and `partial compensation
factors`, for user and control plane are used.
[0018] In more detail, for PUSCH the mobile terminal sets the
output power according to
P PUSCH , c .function. ( i ) = min ##EQU00001## { P C .times. MAX ,
c .function. ( i ) , 10 .times. .times. log 10 .function. ( M PUSCH
, c .function. ( i ) ) + P O .times. .times. _ .times. .times.
PUSCH , c .function. ( j ) + .alpha. c .function. ( j ) PL c +
.DELTA. TF , c .function. ( i ) + f c .function. ( i ) } [ .times.
dBm .times. ] , ##EQU00001.2##
where P.sub.MAXc is the maximum transmit power for the mobile
terminal, M.sub.PUSCHc(i) is the number resource blocks assigned,
P.sub.O_PUSCHc(j) and a control the target received power, PL.sub.c
is the estimated pathloss, .DELTA..sub.TFc(i) is transport format
compensator and f.sub.c(i) is the a UE specific offset or `closed
loop correction`. The function f.sub.c may represent either
absolute or accumulative offsets. The index c numbers the component
carrier and is only of relevance for Carrier Aggregation. For more
detailed description see section 5.1.1.1 of 3GPP TS 36.213, v11.4.0
(incorporated in Annex 1 herewith). The PUCCH power control has a
similar description, see section 5.1.2.1 of 3GPP TS 36.213, v
11.4.0 (incorporated in Annex 1 herewith).
[0019] The closed loop power control can be operated in two
different modes, either accumulated or absolute. Both modes are
based on Transmit Power Control (TPC) command, a command which is
part of the downlink control signaling. When absolute power control
is used, the closed loop correction function is reset every time a
new power control command is received. When accumulated power
control is used, the power control command is a delta correction
with regard to the previously accumulated closed loop correction.
The accumulated power control command is defined as
f.sub.c(i)=f.sub.c(i-1)+.delta..sub.PUSCHc(i-K.sub.PUSCH) where
.delta..sub.PUSCHc is the TPC command received in K.sub.PUSCH
subframe before the current subframe i and f.sub.c(i-1) is the
accumulated power control value. The absolute power control has no
memory, i.e. f.sub.c(i)=.delta..sub.PUSCHc(i-K.sub.PUSCH).
[0020] The PUCCH power control has in principle the same
configurable parameters with the exception that PUCCH only has full
pathloss compensation, i.e. does only cover the case of
.alpha.=1.
Power Headroom Reporting on PUSCH
[0021] In LTE Rel-8, the base station may configure the user
equipment (UE) to send power headroom reports (PHRs) periodically
or when the change in pathloss exceeds a configurable threshold.
The power headroom reports indicate how much transmission power the
UE has left for a subframe i, i.e., the difference between the
nominal UE maximum transmit power and the estimated required power.
The reported value is in the range of 40 to -23 dB, where a
negative value shows that the UE did not have enough power to
conduct the transmission.
[0022] The UE power headroom PH.sub.c for subframe i is defined
as
PH.sub.c(i)=P.sub.CMAXc-{10
log.sub.10(M.sub.PUSCHc(i))+P.sub.O_PUSCHc+(j)+.alpha..sub.c(j)PL.sub.c+.-
DELTA..sub.TFc(i)+f.sub.c(i)} ((1)
where P.sub.CMAXc, M.sub.PUSCHc(i), P.sub.O_PUSCHc(j),
.alpha..sub.c(j), PL.sub.c, .DELTA..sub.TFc(i) and f.sub.c(i) is
defined under the heading "Uplink power control for PUSCH and
PUCCH".
Power Headroom Reporting on PUCCH
[0023] It has been proposed to enable separate PHR for PUCCH if
PUCCH can be transmitted simultaneously with PUSCH. In such cases
either a separate PHR is provided for PUCCH
PH.sub.PUCCHc(i)=P.sub.CMAXc-{P.sub.0_PUCCHc+PL.sub.c+h.sub.c(n.sub.CQI,-
n.sub.HARQ)+.DELTA..sub.F_PUCCH.sub.c(F)+g.sub.c(i)}, (2)
or it is combined with PUSCH,
PH.sub.PUCCHc_and_PUCCHc(i)=P.sub.CMAXc-{P.sub.0_PUCCHc+PL.sub.c+h.sub.c-
(n.sub.CQI,n.sub.HARQ)+.DELTA..sub.F_PUCCH.sub.c(F)+g.sub.c(i)}-{10
log.sub.10(M.sub.PUSCHc(i))+P.sub.O_PUSCHc+(j)+.alpha..sub.c(j)PL.sub.c+.-
DELTA..sub.TFc(i)+f.sub.c(i)} ((3)
The parameter definitions are specified in section 5 in 3GPP TS
36.213 v11.4.0 (see Annex 1) and under the heading "Uplink power
control for PUSCH and PUCCH".
Dual Connectivity
[0024] Dual connectivity is a feature defined from the UE
perspective wherein the UE may simultaneously receive and transmit
to at least two different network points. Dual connectivity is one
of the features that are considered for standardization within the
umbrella work of small cell enhancements for LTE within 3GPP
Rel-12.
[0025] Dual connectivity is defined for the case when the
aggregated network points operate on the same or separate
frequency. Each network point that the UE is aggregating may define
a stand-alone cell or it may not define a stand-alone cell. It is
further foreseen that from the UE perspective, the UE may apply
some form of Time Division Multiplexing (TDM) scheme between the
different network points that the UE is aggregating. This implies
that the communication on the physical layer to and from the
different aggregated network points may not be truly simultaneous.
Thus, rather than purely simultaneous communications, dual
connectivity may be regarded as providing support, to a wireless
device, for contemporaneous communications with multiple network
points, thus having multiple independent connections
simultaneously. Here, "contemporaneous" should be understood as
referring to events or things occurring or existing during the same
period of time, where the periods of time relevant here are time
periods relevant to wireless communications, i.e., on the scale of
transmission time intervals, communications frame times, round-trip
times, etc. The term "simultaneous" could alternatively have been
used to describe the links, but the term contemporaneous is meant
to indicate that the links need not be simultaneously started or be
synchronized or aligned e.g. in terms of frame number, frame
alignment, etc. It is when the contemporaneous links compete for
the same transmission power during an overlapping time period that
the problem addressed herein arises. A link may comprise a number
of carriers, which may be referred to as a carrier group, CG. When
referring to "a link" herein, it is a contemporaneous link that is
referred to if it is not explicitly stated otherwise or obvious
that it is another type of link.
[0026] Dual connectivity, or multi connectivity, as a feature bears
many similarities with carrier aggregation and Coordinated
Multipoint transmission/reception (CoMP); the main differentiating
factor is that dual or multi connectivity is designed considering a
relaxed backhaul and less stringent requirements on synchronization
requirements between the network points. This is in contrast to
carrier aggregation and CoMP wherein tight synchronization and a
low-delay backhaul are assumed between connected network
points.
SUMMARY
[0027] An object of the invention is to improve handling of
transmit power control for a wireless device during dual-, or
multi-connectivity.
[0028] According to a first aspect, a method is provided, which is
to be performed by a network node. The method is suitable for
enabling transmit power control of a wireless device that is
configured to support two or more contemporaneous links with two or
more corresponding wireless access points. The method comprises
obtaining a separate maximum transmit power value for the wireless
device per contemporaneous link; and further comprises transmitting
at least one of the obtained maximum transmit power values to
another network node. Thereby the other network node is enabled to
control the transmit power of the wireless device for a link
corresponding to at least one of the obtained maximum transmit
power values.
[0029] According to a second aspect, a method is provided, which is
to be performed in a network node. The method is suitable for
controlling the transmit power of a wireless device that is
configured to support two or more contemporaneous links with two or
more corresponding wireless access points. The method comprises
obtaining a separate maximum transmit power value for the wireless
device per contemporaneous link; and signaling the separate maximum
transmit power values to the wireless device.
[0030] According to a third aspect, a method is provided, which is
to be performed in a network node. The method is suitable for
scheduling a wireless device, which is configured to support two or
more contemporaneous links with two or more corresponding wireless
access points. The method comprises obtaining a separate maximum
transmit power value for the wireless device per contemporaneous
link and receiving a power headroom report from the wireless
device. The method further comprises scheduling the wireless device
on one of the contemporaneous links, based on the obtained maximum
transmit power value for that link, and on the received power
headroom report.
[0031] According to a fourth aspect, a network node is provided,
for enabling transmit power control of a wireless device that is
configured to support two or more contemporaneous links with two or
more corresponding wireless access points. The network node is
configured to obtain a separate maximum transmit power value for
the wireless device per contemporaneous link; and to transmit at
least one of the obtained maximum transmit power values to another
network node.
[0032] According to a fifth aspect, a network node is provided for
transmit power control of a wireless device that is configured to
support two or more contemporaneous links with two or more
corresponding wireless access points, the network node is
configured to obtain a separate maximum transmit power value for
the wireless device per contemporaneous link; and to signal the
separate maximum transmit power values to the wireless device.
[0033] According to a sixth aspect, a network node is provided for
scheduling a wireless device, which is configured to support two or
more contemporaneous links with two or more corresponding wireless
access points. The network node is configured to obtain a separate
maximum transmit power value for the wireless device per
contemporaneous link, and to receive a power headroom report from
the wireless device. The network node is further configured to
schedule the wireless device on one of the contemporaneous links,
based on the obtained maximum transmit power value for that link,
and on the received power headroom report.
[0034] According to a seventh aspect, a method is provided, which
is to be performed in a wireless device configured to support two
or more contemporaneous links with two or more corresponding
wireless access points. The method comprises receiving a separate
maximum transmit power value for the wireless device for each
contemporaneous link; and applying power control to transmissions
on each contemporaneous link based on the maximum transmit power
value corresponding to the respective link.
[0035] According to an eight aspect, a method is provide, which is
to be performed in a wireless device configured to support two or
more contemporaneous links with two or more corresponding wireless
access points. The method comprises receiving a separate maximum
transmit power value for each contemporaneous link, and receiving
an indication to vary one or more of the maximum transmit power
values according to a time pattern.
[0036] According to a ninth aspect, a wireless device is provided,
which is configured to support two or more contemporaneous links
with two or more corresponding wireless access points. The wireless
device is configured to receive a separate maximum transmit power
value for each contemporaneous link; and to apply power control to
transmissions on each contemporaneous link based on the maximum
transmit power value corresponding to the respective link.
[0037] According to a tenth aspect, a wireless device is provided,
which is configured to support two or more contemporaneous links
with two or more corresponding wireless access points. The wireless
device is configured to receive a separate maximum transmit power
value for each contemporaneous link, and to receive an indication
to vary one or more of the maximum transmit power values according
to a time pattern.
BRIEF DESCRIPTION OF DRAWINGS
[0038] The foregoing and other objects, features, and advantages of
the technology disclosed herein will be apparent from the following
more particular description of embodiments as illustrated in the
accompanying drawings. The drawings are not necessarily to scale,
emphasis instead being placed upon illustrating the principles of
the technology disclosed herein.
[0039] FIG. 1a illustrates the LTE downlink physical resource,
according to the prior art.
[0040] FIG. 1b illustrates the LTE time-domain structure, according
to the prior art.
[0041] FIG. 1c illustrates an LTE downlink subframe, according to
the prior art.
[0042] FIG. 2 shows a PUSCH resource assignment, according to the
prior art.
[0043] FIG. 3 illustrates dual connection.
[0044] FIG. 4 illustrates a relationship between two power levels
according to an embodiment.
[0045] FIGS. 5-8 illustrate procedures in a Network Node, according
to exemplifying embodiments.
[0046] FIGS. 9-10 illustrate procedures in a wireless device,
according to exemplifying embodiments.
[0047] FIG. 11a illustrates a system architecture comprising three
network nodes and a wireless device, and further illustrates the
communication between them, according to an exemplifying
embodiment.
[0048] FIG. 11b illustrates a system architecture comprising two
network nodes and a wireless device, and further illustrates the
communication between them, according to an exemplifying
embodiment.
[0049] FIGS. 12-13 illustrate signaling between network nodes and a
wireless device according to exemplifying embodiments.
[0050] FIGS. 14-16 show a Network Node according to exemplifying
embodiments.
[0051] FIGS. 17-19 show a wireless device according to exemplifying
embodiments.
DETAILED DESCRIPTION
[0052] One problem that arises in a dual connectivity scenario is
that since a wireless device, such as a UE, is simultaneously
connected to two wireless access points, e.g. eNBs, there are
possibilities that a wireless device needs to share its limited
uplink power while transmitting simultaneously towards two
different wireless access points. Applying existing independent
power control algorithms to each of two, or more, links may cause a
situation where the wireless device cannot support both links with
the requested power levels. This is because of the fact that two
different and independent power control loops will provide two
different, uncoordinated uplink power levels related to the links.
Because of power limitations at the wireless device, the requested
levels might not be possible to provide for the wireless
device.
[0053] It is hence not clear how the network is able to perform
uplink (UL) scheduling when the wireless device is able to transmit
to multiple wireless access points in UL by making sure that the
different scheduling wireless access points are not competing for
the same available power at the wireless device.
[0054] Some embodiments disclosed herein describe how the network
may control the amount of power that the wireless device will use
for links to different wireless access points, thereby enabling
operations from independent schedulers for UL.
[0055] Within the context of this disclosure, the term "wireless
device" or "wireless terminal" encompasses any type of wireless
node which is able to communicate with a network node, such as a
base station, or with another wireless device by transmitting
and/or receiving wireless signals. Thus, the term "wireless device"
encompasses, but is not limited to: a user equipment, a mobile
terminal, a stationary or mobile wireless device for
machine-to-machine communication, an integrated or embedded
wireless card, an externally plugged in wireless card, a dongle,
etc. Throughout this disclosure, the term "user equipment" is
sometimes used to exemplify various embodiments. However, this
should not be construed as limiting, as the concepts illustrated
herein are equally applicable to other wireless devices. Hence,
whenever a "user equipment" is referred to in this disclosure, this
should be understood as encompassing any wireless device as defined
above. Although certain figures herein show a device being equipped
with a screen, button and speaker, this is also strictly for
illustrative purpose, and should not be taken to imply that such
features are required to be present for the operation of any of the
embodiments presented herein.
[0056] It should be appreciated that although examples herein refer
to an eNB for purposes of illustration, the concepts described
apply also to other wireless access points. The expressions
"network point" or "wireless access point" as used in this
disclosure is intended to encompass any type of radio base station,
e.g. an eNB, NodeB, a pico or micro node, Home eNodeB or Home
NodeB, or any other type of network node which is capable of
wireless communication with a wireless device.
[0057] In the present disclosure, the terms MeNB for Main eNB and
SeNB for Secondary eNB, are used to describe two different roles
that an eNB could have towards a UE. The nodes could alternatively
be denoted Master eNB and Supporting eNB. We further assume for
simplicity that there is only a single SeNB. In practice there
could, however, be multiple SeNBs. Further, the concept of MeNB and
SeNB could alternatively be referred to as anchor and assisting
eNB.
[0058] The expression "network node" may refer to a wireless access
point as defined above, but also encompasses other types of nodes
residing in a wireless network and which are capable of
communicating with one or more wireless access points either
directly or indirectly, e.g. a centralized network node performing
one or more specific functions. Furthermore it should be
appreciated that a network node may at the same time serve as a
wireless access point, and also perform one or more additional
functions on behalf of other nodes or access points in the
network.
Exemplifying Embodiments
[0059] Exemplifying method embodiments will be described below.
Embodiments will first be described as seen from a perspective of a
network node, which may be a wireless access point or a core
network node, as described above. Further below, exemplifying
method embodiments will be described as seen from a perspective of
a wireless device, such as a UE.
Method in a Network Node.
Transmitting Obtained Maximum Transmission Power to Other Network
Node.
[0060] Below, examples of embodiments of a method performed by a
network node will be described with reference to FIGS. 5-8. The
network node is operable in a wireless communication network
comprising one or more wireless devices, which are configured to
support two or more contemporaneous links with/to two or more
wireless access points.
[0061] A method performed by a network node is illustrated in FIG.
5. The network node obtains 501 a separate maximum transmit power
value, Pmax.sub.i, for a wireless device per contemporaneous link.
The network node further transmits 502 at least one of the obtained
Pmax.sub.is to another network node. By performing these actions,
the other network node is enabled to control the transmit power of
the wireless device for a link corresponding to at least one of the
obtained maximum transmit power values.
[0062] In embodiments where the network node is a wireless access
point, the other network node, to which the at least one obtained
value is transmitted, would be another wireless access point. That
is, when the network node is e.g. an MeNB, the other network node
may be an SeNB, and vice versa. In this case, the at least one of
the obtained maximum transmit power values could be transmitted 502
on the X2 interface between the wireless access points.
[0063] On the other hand, in embodiments where the network node is
some other type of node, such as a core network node on a higher
hierarchical level, the obtained Pmax.sub.is would be transmitted
502 to a wireless access point, such as an MeNB or an SeNB, e.g.
over an S1 interface over a backhaul link.
[0064] Obtaining, or deriving, of a separate Pmax.sub.i per
contemporaneous link could also be referred to as obtaining a
separate Pmax.sub.i for each access point to which the wireless
device is connected via a contemporaneous link. Alternatively, it
could be described as that the network node obtains a maximum
transmission power per wireless access point that the wireless
device can access, or is configured to access, with dual or multi
connectivity. The maximum transmission power obtained by the
network node could be different or the same for different
subframes, different channels, e.g. PUSCH, PUCCH, and/or for
different signals, such as sounding reference symbols (SRS).
[0065] The term obtaining could herein refer to determining, e.g.
calculating or otherwise deriving, the values, or, it could refer
to receiving or retrieving the values from another node.
[0066] The separate maximum transmit power values, Pmax.sub.i, may
be determined based on a total power constraint for the wireless
device.
[0067] For simplicity, the wireless device is below described as
being configured to support two contemporaneous links, i.e.
configured for dual connectivity. However, the different examples
are also applicable for cases with more than two contemporaneous
links.
[0068] A network node determines a maximum transmit power for each
of the contemporaneous links. The power determined for, and
assigned to, the contemporaneous links may be denoted e.g. as
P.sub.1 and P.sub.2; Pmax.sub.i and Pmax.sub.2; or, as P_MeNB and
P_SeNB. Advantageously, the network node determines P.sub.1 and
P.sub.2 such that a total power constraint, i.e.
P.sub.1+P.sub.2.ltoreq.P.sub.TOTALMAX is met. P.sub.TOTALMAX is the
maximum allowed transmission power for the wireless device, e.g.
UE, at any time instance. That is, also when the UE is only
transmitting on one carrier, it cannot use more transmit power than
P.sub.TOTALMAX. The maximum allowed transmission power is typically
predefined e.g. in the 3GPP standard, e.g. denoted P.sub.MAX, and
already known to the network. However, it may also be possible for
the wireless device to signal this information to the network. With
reference to FIG. 4, P.sub.1+P.sub.2 may thus be determined or,
stated differently, chosen such that the total power transmitted by
the wireless device is either on the diagonal line, or below the
diagonal line. In two extreme cases, either P.sub.1 or P.sub.2 is
set to equal P.sub.TOTALMAX, which means that the other value,
P.sub.2 or P.sub.1, will be set to zero. These extreme cases
correspond to assigning all the available power to one of the
contemporaneous links. This may be done for example if the network
node determines that one of the links needs to be prioritized, e.g.
because of a high number of HARQ NACKs on that link indicating a
low reliability of the link. Other criteria related to a priority
of a contemporaneous link could be e.g. the type of traffic carried
on the link. This will be described in more detail further below.
Of course, it is also possible to assign the power levels in other
ways in order to prioritize one of the links, e.g. 80% of the
available power could be assigned to the prioritized
contemporaneous link, and the rest to the non-prioritized, or at
least not as prioritized, contemporaneous link. Another possibility
is to assign as much power as needed to the prioritized
contemporaneous link, and any remaining power to the
non-prioritized contemporaneous link. In a particular variant, one
of the links is prioritized during a limited time period.
[0069] The separate maximum transmit power values may alternatively
be determined such that the sum of all the separate maximum
transmit power values Pmax.sub.i does not exceed the maximum
allowed transmit power for the wireless device minus a threshold
value, i.e. P.sub.TOTALMAX-P.sub.thresh. This threshold value is
related to a tolerance value for P.sub.TOTALMAX, which may be given
in standard documents, and be e.g. on the form .+-.2 dB. When
applying the herein suggested technique comprising separate maximum
transmit power values for each contemporaneous link, a problem may
arise which is related to this tolerance value, if applying this
tolerance value to each separate transmit power value
independently. Thus the tolerance value should be related to
P.sub.TOTALMAX
[0070] When determining the maximum transmission power values, a
number of different aspects may be taken into account. For example,
the network node may determine the maximum transmission power
values based on one or more of: a Power Headroom Report, PHR, from
the wireless device, when such a report is available; a Reference
Signal Received Power (RSRP), a Reference Signal Received Quality
(RSRQ), a buffer status, and a wireless device priority. In the
case of PHR or RSRQ, the network node may decide, for example, to
allow more transmission power to a certain wireless access point
due that the pathloss is higher towards that wireless access point.
The maximum transmission power values could be determined based on
one or more rules, e.g. from a set of rules. Examples of possible
such rules may be e.g. determining a higher transmit power value
for a contemporaneous link with a larger corresponding buffer size,
as compared to another contemporaneous link; determining a higher
transmit power value for a contemporaneous link which has a higher
priority, as compared to another contemporaneous link; and/or
determining a higher transmit power value for a contemporaneous
link having a lower RSRP and/or RSRQ value, as compared to another
contemporaneous link.
[0071] As previously mentioned, different maximum transmission
power levels may be determined, e.g. by an MeNB, not only for
different wireless access points associated with the
contemporaneous links, but also for different subframes; and/or for
different channels and signals. The maximum transmission power
levels may for example be determined, or defined, as a repeating
pattern over time, wherein the length of the pattern may be
arbitrarily long, in principle. As a special case, all available
transmission power may be assigned to one of the contemporaneous
links for a certain time period, and for the next time period all
available transmission power may be assigned to another one of the
contemporaneous links. Herein, the expressions time period and time
interval may be used interchangeably in this context and may refer
to irregular occasions or a single occasion, but also to intervals
in a regular pattern. Both are possible within this disclosure.
[0072] The time pattern may correspond to that the maximum
transmission power value or level is determined based on different
criteria during different time periods. In a specific example, one
of the links might be prioritized higher than the other links
during a certain time period, in which case a higher transmit power
level would be set for the higher prioritized link during that time
period. The prioritization may be due to the type of traffic being
transmitted on the link, e.g. a link carrying real-time traffic may
be prioritized higher than other links; or due to buffer size, e.g.
a link having more data in the corresponding buffer may be
prioritized higher, as previously mentioned. Another possibility is
to prioritize a link which currently has a low reliability, which
may be detected e.g. due to reception of one or several HARQ NACKs
on that link. Other possibilities are to prioritize macro nodes
over e.g. pico nodes, to prioritize control information over data
transmission. Hence, the criterium which is currently deemed by the
network node to be most important to optimize may be applied during
a certain time period when determining a separate maximum transmit
power value for the wireless device per contemporaneous link.
[0073] In one embodiment, the role to determine or define the
maximum transmit power values for both MeNB and SeNB(s) may be
appointed to an SeNB by an MeNB. This could for example be
applicable if the main scheduling is performed from the SeNB. In
another embodiment, the MeNB may provide the authority to an SeNB
to decide or be in control in a periodic manner. As an example, due
to UL traffic, MeNB and SeNB may be in control with certain time
scales based on certain criteria, e.g. buffer status.
[0074] In embodiments where the network node is a wireless access
point, at least one of the obtained maximum transmit power values
could further be signaled to the wireless device. Further, in
embodiments where the network node is a wireless access point, the
network node could schedule the wireless device in the uplink,
based on the obtained maximum transmit power value corresponding to
the contemporaneous link between the network node and the wireless
device. For example, the network node could receive a power
headroom report, PHR, from the wireless device; and schedule the
wireless device on a contemporaneous link based on the maximum
transmit power for that link, and on the received PHR. Further, an
actual power headroom available to the wireless device for
transmission on one of the contemporaneous links may be determined
based on the received PHR and on the obtained maximum transmit
power value for that link. This will all be further described
below.
[0075] The outlined techniques in this disclosure provide the
possibility to utilize UL resources in a more flexible way as they
enable independent scheduling operation of two or more UL cells
when operating in dual- or multi-connectivity mode. Independent
scheduling is enabled by determining the appropriate maximum power
value for each link on the network side. If a scheduling network
node is not aware of which maximum power value that applies for a
wireless device configured for contemporaneous communication, e.g.
dual connectivity, and if the wireless device itself does not
perform any compensation due to the contemporaneous communication,
then the network node may need to perform joint scheduling together
with other network nodes that are involved in contemporaneous
communication with the same wireless device, in order to ensure
that the maximum allowed transmit power is not exceeded for the
terminal.
[0076] It should be noted that the different ways of e.g.
determining a separate maximum transmit power value per
contemporaneous link, and of assigning priority to one of the
contemporaneous links also apply to the other embodiments described
herein.
Signaling Obtained Maximum Transmission Power to Wireless
Device
[0077] As previously mentioned, a network node could signal the
obtained separate maximum transmit power values to a wireless
device associated with multiple contemporaneous links. This could
be referred to as that the network node configures the wireless
device with the separate maximum transmit power values FIG. 6
illustrates an exemplifying embodiment, where a network node
obtains 601 a separate maximum transmit power value for a wireless
device per contemporaneous link, and signals 602 the separate
maximum transmit power values to the wireless device. In this type
of embodiments, the network node would be a wireless access point,
such as an MeNB or SeNB, or a differently denoted node which is
operable to communicate with the wireless device.
[0078] The network node may signal the obtained or derived maximum
transmission power values, Pmax.sub.i, to the wireless device as a
Radio Resource Control (RRC) parameter. This RRC parameter can, for
example, be signaled as the parameter "P-max" in RRC signaling
described in the document 3GPP TS 36.331 v11.5.0 (see also Annex 2)
that is considered within the power control formulas when
determining the maximum transmission power. In case of two
contemporaneous links, only one maximum transmission power value
may need to be signaled to the wireless device. In case of more
than two contemporaneous links, more than one maximum transmission
power value will need to be signaled. Exemplified below is how the
wireless device would derive the maximum transmission power for
PUSCH, wherein the signaled P-max for the contemporaneous link in
question is considered when deriving P.sub.CMAX,c(i). The remaining
parts of the parameters in the expression below are defined in 3GPP
TS 36.213 v11.4.0 (see Annex 1).
P PUSCH , c .function. ( i ) = min ##EQU00002## { P C .times. MAX ,
c .function. ( i ) , 10 .times. .times. log 10 .function. ( M PUSCH
, c .function. ( i ) ) + P O .times. .times. _ .times. .times.
PUSCH , c .function. ( j ) + .alpha. c .function. ( j ) PL c +
.DELTA. TF , c .function. ( i ) + f c .function. ( i ) } [ .times.
dBm .times. ] ##EQU00002.2##
[0079] In a further exemplification of the embodiment it is
possible for the network node to signal a time pattern of a P-max
value to the wireless device, with or without information on which
channels and signals the value applies to.
[0080] The network node may further receive a power headroom
report, PHR, from the wireless device, indicating an available
transmission power. When the wireless device has been provided, or
configured, with the obtained separate maximum transmit power, the
PHR will be based on one or more of these values. FIG. 7
illustrates an embodiment where a network node obtains 701 a
separate maximum transmit power value for the wireless device per
contemporaneous link, and signals 702 the separate maximum transmit
power values to the wireless device. The reason for that action 702
is outlined with a dashed line is that there are possible
embodiments where the Pmax.sub.is are not signalled to the wireless
device, which will be described further below. The network node
further receives 703 a PHR from the wireless device, and schedules
704 the wireless device on a contemporaneous link based on the
maximum transmit power value for that link and based on the PHR. As
previously mentioned, the PHR will then be derived based on a
maximum transmit power value which was signaled to it by the
network node. This embodiment is also illustrated in FIG. 13, where
the network node which signals the Pmax.sub.i to the wireless
device is an SeNB, which in its turn has obtained the Pmax.sub.i
from an MeNB.
Network Node Control Over Wireless Device on Ensuring Max Transmit
Power Limit
[0081] In another embodiment, the obtained maximum transmission
power values are not sent to the wireless device. Instead, each
scheduling network node needs to ensure that the maximum
transmission power allocated to it is not exceeded by the wireless
device. The network node can most likely only do this on average as
the scheduling network node may not know the current pathloss that
the UE observes. Further, there is uncertainness in how the
wireless device sets its power, and also in how the wireless device
may perform power back offs due to multiple reasons. The power
back-offs are usually done by the wireless device to meet
requirements related to not causing too much interference on
neighboring bands, but there are also other reasons for performing
power back-offs. It is, however, typically not known to the network
which exact back-off the wireless device utilizes instead only the
maximum allowed back-off is specified. Hence, the network can not
exactly govern if the UE exceeds the maximum transmission power or
not. However, the network can govern or make sure that when
excluding these aspects, the wireless device should not exceed the
maximum transmission power.
[0082] In some embodiments, a network node considers the maximum
transmission power for the contemporaneous link in question when
assigning an UL grant on PUSCH to a wireless device. In more
detail, when the UL grant is determined by the scheduling network
node, the maximum transmission power for the contemporaneous link
is taken into consideration in selecting the amount of physical
resource blocks (PRBs) that a wireless device would be granted, the
applicable Modulation and Coding Scheme (MCS) value that a wireless
device is given, the transport block size that a wireless device is
assigned, on which PRBs the wireless device is assigned, based on
which type of resource block and/or assignment type that is
selected.
[0083] To assist the network node in assigning a correct power to
the wireless device when it schedules an UL grant, an example is
given below in how PHR (Power Headroom Report/ing) can be used. It
is assumed further that the network node, e.g. eNB, has received
802 a PHR for at least its "own" link, i.e. the contemporaneous
link between the network node and the wireless device. This example
is also illustrated in FIG. 8 and in FIG. 12.
[0084] In FIG. 8, the network node obtains 801 a separate
Pmax.sub.i per contemporaneous link. These values are in this
embodiment not signaled to the wireless device. The network node
receives 802 a PHR from the wireless device, which is not based on
the Pmax.sub.is, which will be described further below. The network
node determines 803 an actual available power headroom, which is
available to the wireless device for transmission on one of the
contemporaneous links. The power headroom is determined based on
the received PHR and on the obtained Pmax.sub.i for that link. The
network node then schedules 804 the wireless device based on the
Pmax.sub.i and the determined actual power headroom. In FIG. 13, an
SeNB receives at least one Pmax.sub.i from an MeNB, and a PHR from
a wireless device involved in dual or multi connectivity. The SeNB
then determines an actual power headroom for the contemporaneous
link between the SeNB and the wireless device and schedules the
wireless device on that link based on the Pmax.sub.i for that link
and the determined power headroom for that link.
[0085] When the network node has not configured the wireless device
with a maximum transmission power value corresponding to the
network decided value, the PHR will be based on a total power
constraint, such as the previously mentioned P.sub.TOTALMAX.
[0086] That is, the wireless device may be unaware of the herein
disclosed technology, and estimate the power headroom without
considering the dual or multi connectivity. The network node would
need to translate the PHR report received from the wireless device
from being based on a default maximum transmission power value,
assumed by the wireless device, to being based on, or reflecting,
the separate maximum transmission power for the link, obtained by
the network node. Expressed differently, the network node needs to
determine the "actual" power headroom for the contemporaneous link
based on a power headroom, indicated in the PHR, which is based on
a default maximum transmission power value. One way of performing a
translation and thus determining an actual power headroom is to
determine, i.e. "figure out", the minimum transmission power that
the wireless device requires for transmitting a single PRB with a
certain modulation in dBm and then compare this to the
network-given maximum transmission power value, Pmax.sub.i, in dBm.
After this comparison the network node will have an internal
understanding of the "actual" available power headroom for
scheduling on the specific uplink cell, i.e. on the specific
contemporaneous link.
[0087] The network node may utilize this determined "actual" power
headroom value when it performs scheduling and link adaptation e.g.
by assigning a specific number of PRBs, Transport Block Size (TBS),
modulation etc., such that the UE does not exceeds it maximum
transmission power; that is, excluding the above mention
uncertainties.
[0088] In embodiments where the network node does configure the
wireless device with a Pmax value that corresponds to the maximum
transmission power value Pmax.sub.i determined by the network, the
network node does not need to translate a PHR.
[0089] Instead, the network node can use the PHR directly when
performing scheduling or/and link adaption, particularly in
determining the number of PRBs, TBS size, modulation and so on, for
the wireless device.
[0090] In some variants, a wireless access point that has the
priority over another wireless access point in determining the
maximum allowed transmission power for a wireless device may use
different criteria on different time scales, meaning that for
different channels or for different subframes, it may make use of
different criteria in the decision process. The different criteria
could e.g. be the previously mentioned UL buffer status, pathloss
(RSRP), etc.
[0091] As mentioned above, as a specific example, different
criteria may be applied due to that one of the contemporaneous
links is prioritized higher than the other contemporaneous links
during a certain time period, in which case a higher transmit power
level could be set for the higher prioritized link during that time
period. The prioritization may be due to e.g. the type of traffic
being transmitted on the link, e.g. a link carrying real-time
traffic may be prioritized higher than other links. The priority of
a link may alternatively or further be based on a buffer size,
where e.g. a link having more data in a corresponding buffer as
compared to another link may be prioritized higher, and thus e.g.
be allocated a higher transmit power. Another possibility is to
prioritize a link which currently has a low reliability, which may
be detected e.g. due to reception of one or several HARQ NACKs on
that link. Other possibilities are to prioritize macro nodes over
e.g. pico nodes, to prioritize control information over data
transmission. Hence, the criteria which is currently deemed by the
network node to be most important to optimize may be applied during
a certain time period.
Signaling Between Wireless Access Points
[0092] In another embodiment, when UE is configured for dual
connectivity, the eNBs provides the maximum transmission power
information to each other. More specifically, the deciding eNB
transmits the information via the backhaul or X2.
[0093] In another embodiment, similar to the one mentioned under
"Signaling derived maximum transmission power to wireless device",
the deciding wireless access point signals the maximum allowed
transmit power information to the wireless device when the dual
connectivity is setup for any wireless device.
[0094] In another embodiment, if there are changes in the network
information, e.g RSRP received at the wireless access point, etc,
then the new maximum transmission power could be signaled to the
wireless device when the wireless device is scheduled.
[0095] In another embodiment, the signaling between wireless access
points and between the wireless access point and wireless device
may be provided in a fixed periodic manner, or the signaling from
multiple wireless access points to the wireless device may be
designed in a TDM manner.
Method in Wireless Device
[0096] Some embodiments herein also relate to a method performed by
a wireless device configured to support two or more contemporaneous
links with two or more corresponding wireless access points.
Exemplifying embodiments of a method in a wireless device will be
described below with reference to FIGS. 9-10.
[0097] According to an exemplifying method embodiment illustrated
in FIG. 9, the wireless device receives 901 a separate maximum
transmit power value for each contemporaneous link, and applies 903
power control to transmissions on each contemporaneous link based
on the maximum transmit power value corresponding to the respective
link. Apart from actual implementation of determined power control
parameters, apply power control could e.g. comprise determining
power headroom values per contemporaneous link based on the
received separate maximum power transmit values. The wireless
device could further provide a respective determined power headroom
value to the respective wireless access points with which it is
involved in dual or multi connectivity.
[0098] In some embodiments, the wireless device may further receive
1002 an indication from a network node to vary one or more of the
maximum transmit power values according to a time pattern. The
wireless device may then apply power control to transmissions on
the corresponding link or links according to the time pattern. That
is, the method comprises receiving 1001 a separate maximum transmit
power value for each contemporaneous link, and receiving 1002 an
indication to vary one or more of the maximum transmit power values
according to a time pattern.
[0099] In a variant, which is also illustrated with a dashed
outline in FIG. 9, the wireless device further determines 902 that
contemporaneous transmission will be performed based on having
received more than one uplink grant with respect to a subframe k,
and applies power control to transmissions on each contemporaneous
link in subframe k using the maximum transmit power value for that
link.
[0100] A further embodiment provides a method performed in a
wireless device configured to support two or more contemporaneous
links with two or more corresponding wireless access points. The
method comprises receiving a separate maximum transmit power value
for the wireless device for each contemporaneous link, and
receiving an indication to vary one or more of the maximum transmit
power values according to a time pattern.
Hardware Implementations
Network Node
[0101] Several of the techniques and processes described above can
be implemented in a network node, such as an eNB or other node in a
3GPP network. FIG. 14 is a schematic illustration of a network node
1 in which a method embodying any of the presently described
network-based techniques can be implemented. A computer program for
controlling the node 1 to carry out a method embodying the present
invention is stored in a program storage 30, which comprises one or
several memory devices. Data used during the performance of a
method embodying the present invention is stored in a data storage
20, which also comprises one or more memory devices. During
performance of a method embodying the present invention, program
steps are fetched from the program storage 30 and executed by a
Central Processing Unit (CPU) 10, retrieving data as required from
the data storage 20. Output information resulting from performance
of a method embodying the present invention can be stored back in
the data storage 20, or sent to an Input/Output (I/O) interface 40,
which includes a network interface for sending and receiving data
to and from other network nodes and which may also include a radio
transceiver for communicating with one or more terminals.
[0102] Accordingly, in various embodiments of the invention,
processing circuits, such as the CPU 10 and memory circuits 20 and
30 in FIG. 14, are configured to carry out one or more of the
techniques described in detail above. Likewise, other embodiments
may include base stations and/or radio network controllers that
include one or more such processing circuits. In some cases, these
processing circuits are configured with appropriate program code,
stored in one or more suitable memory devices, to implement one or
more of the techniques described herein. Of course, it will be
appreciated that not all of the steps of these techniques are
necessarily performed in a single microprocessor or even in a
single module.
[0103] An exemplifying embodiment of a network node is illustrated
in a general manner in FIG. 15. The network node 1500 is configured
to perform at least one of the method embodiments described above
with reference to any of FIG. 5-8 or 11-13. The network node 1500
is associated with the same technical features, objects and
advantages as the previously described method embodiments. The node
will be described in brief in order to avoid unnecessary
repetition.
[0104] The part of the network node 1500 which is most affected by
the adaptation to the herein described solution is illustrated as
an arrangement 1501, surrounded by a dashed line. The network node
1500 or arrangement 1501 may be assumed to comprise further
functionality 1506, for carrying out regular node functions. These
functions would be at least partly different depending on whether
the network node is a wireless access point or a node on a higher
hierarchical level in the wireless communication network.
[0105] The network node or the arrangement part of the network node
may be implemented and/or described as follows:
[0106] The network node 1500 comprises processing means 1503, such
as a processor, and a memory 1504 for storing instructions, the
memory comprising instructions, e.g. computer program 1505, which
when executed by the processing means causes the network node 1500
or arrangement 1501 to obtain a separate maximum transmit power
value for a wireless device per contemporaneous link. The execution
of the instructions further causes the network node to transmit at
least one of the obtained maximum transmit power values to another
network node. Alternatively, or in addition, the execution of the
instructions may cause the network node to signal the separate
maximum transmit power values to the wireless device; and/or to
receive a power headroom report from the wireless device, and
schedule the wireless device on one of the contemporaneous links,
based on the obtained maximum transmit power value for that link,
and e.g. on the received power headroom report.
[0107] An alternative implementation of the network node 1500 is
shown in FIG. 16. The network node 1600 or arrangement 1601
comprises an obtaining unit 1602, configured to obtain a separate
maximum transmit power value for a wireless device per
contemporaneous link. The network node further comprises a
transmitting unit 1603, configured transmit at least one of the
obtained maximum transmit power values to another network node.
[0108] The network nodes described above could be configured for
the different method embodiments described herein. For example, the
network node 1600 could comprise a receiving unit 1604 configured
to receive a power headroom report from the wireless device, and a
scheduling unit 1605, configured for scheduling the wireless device
on one of the contemporaneous links, based on the obtained maximum
transmit power value for that link, and e.g. on the received power
headroom report.
Wireless Device
[0109] Similarly, several of the techniques and methods described
above may be implemented using radio circuitry and electronic data
processing circuitry provided in a wireless device. FIG. 17
illustrates features of an example wireless device 1700 according
to several embodiments presented herein. Wireless device 1700,
which may be a UE configured for dual-connectivity operation with
an LTE network (E-UTRAN), for example, comprises digital signal
processing circuitry 1510, which in turn comprises baseband
circuitry 1712 and 1714. Baseband circuitry 1712 and 1714 are each
connected to one or more power amplifiers each coupled to one or
more transmit/receive antennas. Hence, the mobile terminal is able
to perform contemporaneous communication with two or more wireless
access points by means of separate transmit/receive circuitry.
Although FIG. 17 shows the same antenna being used for transmission
and reception, separate receive and transmit antennas are also
possible. The mobile terminal 1700 further comprises processing
circuitry 1720 for processing the transmitted and received signals.
Note also that digital processing circuitry 1710 may comprise
separate radio and/or baseband circuitry for each of two or more
different types of radio access network, such as radio/baseband
circuitry adapted for E-UTRAN access and separate radio/baseband
circuitry adapted for Wi-Fi access. The same applies to the
antennas: while in some cases one or more antennas may be used for
accessing multiple types of networks, in other cases one or more
antennas may be specifically adapted to a particular radio access
network or networks. Because the various details and engineering
tradeoffs associated with the design and implementation of such
circuitry are well known and are unnecessary to a full
understanding of the invention, additional details are not shown
here.
[0110] An exemplifying embodiment of a wireless device is
illustrated in a general manner in FIG. 18. The wireless device
1800 is configured to perform at least one of the method
embodiments for a wireless device described above with reference to
any of FIGS. 9-13. The wireless device 1800 is associated with the
same technical features, objects and advantages as the previously
described method embodiments for a wireless device. The terminal
will be described in brief in order to avoid unnecessary
repetition.
[0111] The part of the wireless device 1800 which is most affected
by the adaptation to the herein described solution is illustrated
as an arrangement 1801, surrounded by a dashed line. The wireless
device 1800 or arrangement 1801 may be assumed to comprise further
functionality 1806, for carrying out regular terminal
functions.
[0112] The wireless device or the arrangement part of the wireless
device may be implemented and/or described as follows:
[0113] The wireless device 1800 comprises processing means 1803,
such as a processor, and a memory 1804 for storing instructions,
the memory comprising instructions, e.g. computer program 1805,
which when executed by the processing means causes the network node
1800 or arrangement 1801 to receive a separate maximum transmit
power value, for the wireless device, for each contemporaneous
link. The execution of the instructions further causes the wireless
device to apply power control to transmissions on each
contemporaneous link based on the maximum transmit power value
corresponding to the respective link. The execution of the
instructions may further cause the wireless device to receive an
indication to vary one or more of the maximum transmit power values
according to a time pattern
[0114] An alternative implementation of the network node 1800 is
shown in FIG. 19. The wireless device 1900 or arrangement 1901
comprises a receiving unit 1902, configured to receive a separate
maximum transmit power value for each contemporaneous link. The
wireless device further comprises a power control unit 1903,
configured to apply power control to transmissions on each
contemporaneous link based on the maximum transmit power value
corresponding to the respective link.
[0115] The wireless device embodiments described above could be
configured for the different method embodiments described herein.
For example, the receiving unit 1902 could be further configured to
receive an indication to vary one or more of the maximum transmit
power values according to a time pattern. The wireless device 1900
could further comprise a determining unit 1904 configured to
determine that contemporaneous transmission will be, or is to be,
performed, based on having received more than one uplink grant with
respect to a subframe k.
[0116] Processing circuitry 1720 or 1803 may comprise one or more
processors coupled to one or more memory devices that make up a
data storage memory and a program storage memory. The processor(s)
may be a microprocessor, microcontroller, or digital signal
processor, in some embodiments. More generally, processing
circuitry 1720 may comprise a processor/firmware combination, or
specialized digital hardware, or a combination thereof. The memory
may comprise one or several types of memory such as read-only
memory (ROM), random-access memory, cache memory, flash memory
devices, optical storage devices, etc. Again, because the various
details and engineering tradeoffs associated with the design of
baseband processing circuitry for mobile devices are well known and
are unnecessary to a full understanding of the invention,
additional details are not shown here.
[0117] Typical functions of the processing circuitry 1720 or of the
further functionality 1507 or 1607 include modulation and coding of
transmitted signals and the demodulation and decoding of received
signals. In several embodiments of the present invention,
processing circuit 1720 is adapted, using suitable program code
stored in a program storage memory, for example, to carry out one
of the techniques described above for controlling transmit power.
Of course, it will be appreciated that not all of the steps of
these techniques are necessarily performed in a single
microprocessor or even in a single module.
[0118] The units or modules in the arrangements in the respective
different network node embodiments and wireless device embodiments
described above could be implemented e.g. by one or more of: a
processor or a microprocessor and adequate software and memory for
storing thereof, a Programmable Logic Device (PLD) or other
electronic component(s) or processing circuitry configured to
perform the actions described above, and illustrated e.g. in FIGS.
5-10. That is, the units or modules in the arrangements in the
different nodes described above could be implemented by a
combination of analog and digital circuits, and/or one or more
processors configured with software and/or firmware, e.g. stored in
a memory. One or more of these processors, as well as the other
digital hardware, may be included in a single application-specific
integrated circuitry, ASIC, or several processors and various
digital hardware may be distributed among several separate
components, whether individually packaged or assembled into a
system-on-a-chip, SoC.
[0119] It should be noted that although terminology from 3GPP LTE
has been used in this disclosure to exemplify the invention, this
should not be seen as limiting the scope of the invention to only
the aforementioned system. Other wireless systems which support
contemporaneous connections with two or more wireless access
points, e.g. dual connectivity, may also benefit from exploiting
the ideas covered within this disclosure.
[0120] When using the word "comprise" or "comprising" it shall be
interpreted as non-limiting, i.e. meaning "consist at least
of".
[0121] Example embodiments are described herein with reference to
block diagrams and/or flowchart illustrations of
computer-implemented methods, apparatus (systems and/or devices)
and/or computer program products. It is understood that a block of
the block diagrams and/or flowchart illustrations, and combinations
of blocks in the block diagrams and/or flowchart illustrations, can
be implemented by computer program instructions that are performed
by one or more computer circuits. These computer program
instructions may be provided to a processor circuit of a general
purpose computer circuit, special purpose computer circuit, and/or
other programmable data processing circuit to produce a machine,
such that the instructions, which execute via the processor of the
computer and/or other programmable data processing apparatus,
transform and control transistors, values stored in memory
locations, and other hardware components within such circuitry to
implement the functions/acts specified in the block diagrams and/or
flowchart block or blocks, and thereby create means (functionality)
and/or structure for implementing the functions/acts specified in
the block diagrams and/or flowchart block(s).
[0122] These computer program instructions may also be stored in a
tangible computer-readable medium that can direct a computer or
other programmable data processing apparatus to function in a
particular manner, such that the instructions stored in the
computer-readable medium produce an article of manufacture
including instructions which implement the functions/acts specified
in the block diagrams and/or flowchart block or blocks.
Accordingly, embodiments of present inventive concepts may be
embodied in hardware and/or in software (including firmware,
resident software, micro-code, etc.) running on a processor such as
a digital signal processor, which may collectively be referred to
as "circuitry," "a module" or variants thereof.
[0123] It should also be noted that in some alternate
implementations, the functions/acts noted in the blocks may occur
out of the order noted in the flowcharts. For example, two blocks
shown in succession may in fact be executed substantially
concurrently or the blocks may sometimes be executed in the reverse
order, depending upon the functionality/acts involved. Moreover,
the functionality of a given block of the flowcharts and/or block
diagrams may be separated into multiple blocks and/or the
functionality of two or more blocks of the flowcharts and/or block
diagrams may be at least partially integrated. Finally, other
blocks may be added/inserted between the blocks that are
illustrated, and/or blocks/operations may be omitted without
departing from the scope of inventive concepts. Moreover, although
some of the diagrams include arrows on communication paths to show
a primary direction of communication, it is to be understood that
communication may occur in the opposite direction to the depicted
arrows.
[0124] Modifications and other embodiments of the disclosed
invention(s) will come to mind to one skilled in the art having the
benefit of the teachings presented in the foregoing descriptions
and the associated drawings. Therefore, it is to be understood that
the invention(s) is/are not to be limited to the specific
embodiments disclosed and that modifications and other embodiments
are intended to be included within the scope of this disclosure.
Although specific terms may be employed herein, they are used in a
generic and descriptive sense only and not for purposes of
limitation.
[0125] It is to be understood that the choice of interacting units,
as well as the naming of the units within this disclosure are only
for exemplifying purpose, and nodes suitable to 5 execute any of
the methods described above may be configured in a plurality of
alternative ways in order to be able to execute the suggested
procedure actions.
[0126] It should also be noted that the units described in this
disclosure are to be regarded as logical entities and not with
necessity as separate physical entities.
[0127] While the embodiments have been described in terms of
several embodiments, it is contemplated that alternatives,
modifications, permutations and equivalents thereof will become
apparent upon reading of the specifications and study of the
drawings. It is therefore intended that the following appended
claims include such alternatives, modifications, permutations and
equivalents as fall within the scope of the embodiments.
ABBREVIATIONS
[0128] 3GPP 3rd Generation Partnership Project [0129] DFT Discrete
Fourier Transform [0130] eNB or [0131] eNodeB Enhanced Node B
[0132] E-UTRAN Evolved Universal Terrestrial Access Network [0133]
FDD Frequency Division Duplex [0134] LTE Long Term Evolution [0135]
OFDM Orthogonal Frequency Division Multiplexing [0136] PHR Power
Headroom Report/ing [0137] PUCCH Physical Uplink Control Channel
[0138] PUSCH Physical Uplink Shared Channel [0139] TDD Time
Division Duplex [0140] UMTS Universal Mobile Telecommunication
System Annex 1: Excerpts from 3GPP TS 36.213, v11.4.0
5.1 Uplink Power Control
[0141] Uplink power control controls the transmit power of the
different uplink physical channels.
[0142] For PUSCH, the transmit power {circumflex over
(P)}.sub.PUSCH,c(i) defined in clause 5.1.1, is first scaled by the
ratio of the number of antennas ports with a non-zero PUSCH
transmission to the number of configured antenna ports for the
transmission scheme. The resulting scaled power is then split
equally across the antenna ports on which the non-zero PUSCH is
transmitted.
[0143] For PUCCH or SRS, the transmit power {circumflex over
(P)}.sub.PUCCH(i), defined in clause 5.1.1.1, or {circumflex over
(P)}.sub.SRS,c(i) is split equally across the configured antenna
ports for PUCCH or SRS. {circumflex over (P)}.sub.SRS,c(1) is the
linear value of {circumflex over (P)}.sub.SRS,c(i) defined in
clause 5.1.3.
[0144] A cell wide overload indicator (OI) and a High Interference
Indicator (HII) to control UL interference are defined in [9].
5.1.1 Physical Uplink Shared Channel
5.1.1.1 UE Behaviour
[0145] The setting of the UE Transmit power for a Physical Uplink
Shared Channel (PUSCH) transmission is defined as follows.
[0146] If the UE transmits PUSCH without a simultaneous PUCCH for
the serving cell c, then the UE transmit power P.sub.PUSCH,c (i)
for PUSCH transmission in subframe i for the serving cell c is
given by
P PUSCH , c .function. ( i ) = min ##EQU00003## { P C .times. MAX ,
c .function. ( i ) , 10 .times. .times. log 10 .function. ( M PUSCH
, c .function. ( i ) ) + P O .times. .times. _ .times. .times.
PUSCH , c .function. ( j ) + .alpha. c .function. ( j ) PL c +
.DELTA. TF , c .function. ( i ) + f c .function. ( i ) } [ .times.
dBm .times. ] ##EQU00003.2##
If the UE transmits PUSCH simultaneous with PUCCH for the serving
cell c, then the UE transmit power P.sub.PUSCH,c (i) for the PUSCH
transmission in subframe i for the serving cell c is given by
P PUSCH , c .function. ( i ) = min ##EQU00004## { 10 .times.
.times. log 1 .times. 0 .function. ( P ^ C .times. M .times. A
.times. X , c .function. ( i ) - P ^ P .times. U .times. C .times.
C .times. H .function. ( i ) ) , 10 .times. .times. log 1 .times. 0
.function. ( M P .times. U .times. S .times. C .times. H , c
.function. ( i ) ) + P O .times. .times. _ .times. .times. PUSCH ,
c .function. ( j ) + .alpha. c .function. ( j ) P .times. L c +
.DELTA. T .times. F , c .function. ( i ) + f c .function. ( i ) }
.function. [ dBm ] ##EQU00004.2##
[0147] If the UE is not transmitting PUSCH for the serving cell c,
for the accumulation of TPC command received with DCI format 3/3A
for PUSCH, the UE shall assume that the UE transmit power
P.sub.PUSCH,c (i) for the PUSCH transmission in subframe i for the
serving cell c is computed by
P.sub.PUSCH,c(i)=min{P.sub.CMAX,c(i),P.sub.O_PUSCH,c(1)+.alpha..sub.c(1)-
PL.sub.c+f.sub.c(i)} [dBm]
where, [0148] P.sub.CMAX,c(i) is the configured UE transmit power
defined in [6] in subframe i for serving cell c and {circumflex
over (P)}.sub.CMAX,c(i) is the linear value of P.sub.CMAX,c(i). If
the UE transmits PUCCH without PUSCH in subframe i for the serving
cell c, for the accumulation of TPC command received with DCI
format 3/3A for PUSCH, the UE shall assume P.sub.CMAX,c(i) as given
by clause 5.1.2.1. If the UE does not transmit PUCCH and PUSCH in
subframe i for the serving cell c, for the accumulation of TPC
command received with DCI format 3/3A for PUSCH, the UE shall
compute P.sub.CMAX,c(i) assuming MPR=0 dB, A-MPR=0 dB, P-MPR=0 dB
and .DELTA.T.sub.C=0 dB, where MPR, A-MPR, P-MPR and .DELTA.T.sub.C
are defined in [6]. [0149] {circumflex over (P)}.sub.PUCCH(i) is
the linear value of P.sub.PUCCH(i) defined in clause 5.1.2.1 [0150]
M.sub.PUSCH,c(i) is the bandwidth of the PUSCH resource assignment
expressed in number of resource blocks valid for subframe i and
serving cell c. [0151] P.sub.O_PUSCH(j) is a parameter composed of
the sum of a component P.sub.O_NOMINAL_PUSCH,c(J) provided from
higher layers for j=0 and 1 and a component P.sub.O_UE_PUSCH,c(j)
provided by higher layers for j=0 and 1 for serving cell c. For
PUSCH (re)transmissions corresponding to a semi-persistent grant
then j=0, for PUSCH (re)transmissions corresponding to a dynamic
scheduled grant then j=1 and for PUSCH (re)transmissions
corresponding to the random access response grant then j=2.
P.sub.O_UE_PUSCH,c(2)=0 and
P.sub.O_NOMINAL_PUSCH,c(2)=P.sub.O_PRE+.DELTA..sub.PREAMBLE_Msg3,
where the parameter preambleInitialReceivedTargetPower [8]
(P.sub.O_PRE) and .DELTA..sub.PREAMBLE _Msg3 are signalled from
higher layers for serving cell c. [0152] For j=0 or 1, ac e {0,
0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1} is a 3-bit parameter provided by
higher layers for serving cell c. For j=2, .alpha..sub.c(1)=1.
[0153] PL.sub.c is the downlink pathloss estimate calculated in the
UE for serving cell c in dB and
PL.sub.c=referenceSignalPower--higher layer filtered RSRP, where
referenceSignalPower is provided by higher layers and RSRP is
defined in [5] for the reference serving cell and the higher layer
filter configuration is defined in [11] for the reference serving
cell. If serving cell c belongs to a TAG containing the primary
cell then, for the uplink of the primary cell, the primary cell is
used as the reference serving cell for determining
referenceSignalPower and higher layer filtered RSRP. For the uplink
of the secondary cell, the serving cell configured by the higher
layer parameter pathlossReferenceLinking defined in [11] is used as
the reference serving cell for determining referenceSignalPower and
higher layer filtered RSRP. If serving cell c belongs to a TAG not
containing the primary cell then serving cell c is used as the
reference serving cell for determining referenceSignalPower and
higher layer filtered RSRP. [0154] .DELTA..sub.TF,c(i)=10
log.sub.10 ((2.sup.BPREK.sup.s-1).beta..sub.offset.sup.PUSCH for
K.sub.s=1.25 and 0 for K.sub.s=0 where K.sub.s is given by the
parameter deltaMCS-Enabled provided by higher layers for each
serving cell c. BPRE and .beta..sub.offset.sup.PUSCH, for each
serving cell c, are computed as below. K.sub.s=0 for transmission
mode 2. [0155] BPRE=O.sub.CQI/N.sub.RE for control data sent via
PUSCH without UL-SCH data and
[0155] r = 0 C - 1 .times. K r / N R .times. E ##EQU00005## [0156]
for other cases. [0157] where C is the number of code blocks,
K.sub.r is the size for code block r, O.sub.CQI is the number of
CQI/PMI bits including CRC bits and N.sub.RE is the number of
resource elements determined as
N.sub.RE=M.sub.sc.sup.PUSCH-initialN.sub.symb.sup.PUSCH-initial,
where C, K.sub.r, M.sub.sc.sup.PUSCH-initial and
N.sub.symb.sup.PUSCH-initial are defined in [4]. [0158]
.beta..sub.offset.sup.PUSCH=.beta..sub.offset.sup.CQI for control
data sent via PUSCH without UL-SCH data and 1 for other cases.
[0159] .delta..sub.PUSCH,c is a correction value, also referred to
as a TPC command and is included in PDCCH/EPDCCH with DCI format
0/4 for serving cell c or jointly coded with other TPC commands in
PDCCH with DCI format 3/3A whose CRC parity bits are scrambled with
TPC-PUSCH-RNTI. The current PUSCH power control adjustment state
for serving cell c is given by fc (i) which is defined by: [0160]
f.sub.c(i)=f.sub.c(i-1)+.delta..sub.PUSCH,c(i-K.sub.PUSCH) if
accumulation is enabled based on the parameter Accumulation-enabled
provided by higher layers or if the TPC command .delta..sub.PUSCH,c
is included in a PDCCH/EPDCCH with DCI format 0 for serving cell c
where the CRC is scrambled by the Temporary C-RNTI [0161] where
.delta..sub.PUSCH,c(i-K.sub.PUSCH) was signalled on PDCCH/EPDCCH
with DCI format 0/4 or PDCCH with DCI format 3/3A on subframe
i-K.sub.PUSCH, and where f.sub.c(0) is the first value after reset
of accumulation. [0162] The value of K.sub.PUSCH is [0163] For FDD,
K.sub.PUSCH=4 [0164] For TDD, if the UE is configured with more
than one serving cell and the TDD UL/DL configuration of at least
two configured serving cells is not the same, the "TDD UL/DL
configuration" refers to the UL-reference UL/DL configuration
(defined in clause 8.0) for serving cell c. [0165] For TDD UL/DL
configurations 1-6, K.sub.PUSCH is given in Table 5.1.1.1-1 [0166]
For TDD UL/DL configuration 0 If the PUSCH transmission in subframe
2 or 7 is scheduled with a PDCCH/EPDCCH of DCI format 0/4 in which
the LSB of the UL index is set to 1, K.sub.PUSCH=7 For all other
PUSCH transmissions, K.sub.PUSCH is given in Table 5.1.1.1-1.
[0167] For serving cell c the UE attempts to decode a PDCCH/EPDCCH
of DCI format 0/4 with the UE's C-RNTI or DCI format 0 for SPS
C-RNTI and a PDCCH of DCI format 3/3A with this UE's TPC-PUSCH-RNTI
in every subframe except when in DRX or where serving cell c is
deactivated. [0168] If DCI format 0/4 for serving cell c and DCI
format 3/3A are both detected in the same subframe, then the UE
shall use the .delta..sub.PUSCH,c provided in DCI format 0/4.
[0169] .delta..sub.PUSCH,c=0 dB for a subframe where no TPC command
is decoded for serving cell c or where DRX occurs or i is not an
uplink subframe in TDD. [0170] The .delta..sub.PUSCH,c dB
accumulated values signalled on PDCCH/EPDCCH with DCI format 0/4
are given in Table 5.1.1.1-2. If the PDCCH/EPDCCH with DCI format 0
is validated as a SPS activation or release PDCCH/EPDCCH, then
.delta..sub.PUSCH,c is 0 dB. [0171] The .delta..sub.PUSCH dB
accumulated values signalled on PDCCH with DCI format 3/3A are one
of SET1 given in Table 5.1.1.1-2 or SET2 given in Table 5.1.1.1-3
as determined by the parameter TPC-Index provided by higher layers.
[0172] If UE has reached P.sub.CMAX,c(i) for serving cell c,
positive TPC commands for serving cell c shall not be accumulated
[0173] If UE has reached minimum power, negative TPC commands shall
not be accumulated [0174] UE shall reset accumulation [0175] For
serving cell c, when P.sub.O_UE_PUSCH,c value is changed by higher
layers [0176] For serving cell c, when the UE receives random
access response message for serving cell c [0177]
f.sub.c(i)=.delta..sub.PUSCH,c(i-K.sub.PUSCH) if accumulation is
not enabled for serving cell c based on the parameter
Accumulation-enabled provided by higher layers [0178] where
.delta..sub.PUSCH,c(i-K.sub.PUSCH) was signalled on PDCCH/EPDCCH
with DCI format 0/4 for serving cell c on subframe i-K.sub.PUSCH
[0179] The value of K.sub.PUSCH is [0180] For FDD, K.sub.PUSCH=4
[0181] For TDD, if the UE is configured with more than one serving
cell and the TDD UL/DL configuration of at least two configured
serving cells is not the same, the "TDD UL/DL configuration" refers
to the UL-reference UL/DL configuration (defined in clause 8.0) for
serving cell c. [0182] For TDD UL/DL configurations 1-6,
K.sub.PUSCH is given in Table 5.1.1.1-1. [0183] For TDD UL/DL
configuration 0 If the PUSCH transmission in subframe 2 or 7 is
scheduled with a PDCCH/EPDCCH of DCI format 0/4 in which the LSB of
the UL index is set to 1, K.sub.PUSCH=7 For all other PUSCH
transmissions, K.sub.PUSCH is given in Table 5.1.1.1-1. [0184] The
.delta..sub.PUSCH,c dB absolute values signalled on PDCCH/EPDCCH
with DCI format 0/4 are given in Table 5.1.1.1-2. If the
PDCCH/EPDCCH with DCI format 0 is validated as a SPS activation or
release PDCCH/EPDCCH, then .delta..sub.PUSCH,c is 0 dB. [0185]
f.sub.c(i)=f.sub.c(i-1) for a subframe where no PDCCH/EPDCCH with
DCI format 0/4 is decoded for serving cell c or where DRX occurs or
i is not an uplink subframe in TDD. [0186] For both types of
f.sub.c(*) (accumulation or current absolute) the first value is
set as follows: [0187] If P.sub.O_UE_PUSCH,c value is changed by
higher layers and serving cell c is the primary cell or, if
P.sub.O_UE_PUSCH,c value is received by higher layers and serving
cell c is a Secondary cell
[0187] f.sub.c(0)=0 [0188] Else [0189] If the UE receives the
random access response message for a serving cell c
[0189] f.sub.c(0)=.DELTA.P.sub.rampage+.delta..sub.msg2,c, where
.delta..sub.msg2,c is the TPC command indicated in the random
access response corresponding to the random access preamble
transmitted in the serving cell c, see clause 6.2, and
.DELTA. .times. P rampup , c = min [ { max .function. ( 0 , P C
.times. MAX , c - .times. ( 10 .times. .times. log 10 .function. (
M PUSCH , c .function. ( 0 ) ) + P O .times. .times. _ .times.
.times. PUSCH , c .function. ( 2 ) + .delta. msg .times. .times. 2
+ .alpha. c .function. ( 2 ) PL + .DELTA. TF , c .function. ( 0 ) )
) .times. .DELTA.P rampu .times. p .times. r .times. e .times. q
.times. u .times. e .times. s .times. ted , c ] ##EQU00006## [0190]
and .DELTA.N.sub.rampuprequested,c is provided by higher layers and
corresponds to the total power ramp-up requested by higher layers
from the first to the last preamble in the serving cell c,
M.sub.PUSCH,c(0) is the bandwidth of the PUSCH resource assignment
expressed in number of resource blocks valid for the subframe of
first PUSCH transmission in the serving cell c, and
.DELTA..sub.TF,c(0) is the power adjustment of first PUSCH
transmission in the serving cell c.
TABLE-US-00001 [0190] TABLE 5.1.1.1-1 K.sub.PUSCH for TDD
configuration 0-6 TDD UL/DL subframe number i Configuration 0 1 2 3
4 5 6 7 8 9 0 -- -- 6 7 4 -- -- 6 7 4 1 -- -- 6 4 -- -- -- 6 4 -- 2
-- -- 4 -- -- -- -- 4 -- -- 3 -- -- 4 4 4 -- -- -- -- -- 4 -- -- 4
4 -- -- -- -- -- -- 5 -- -- 4 -- -- -- -- -- -- -- 6 -- -- 7 7 5 --
-- 7 7 --
TABLE-US-00002 TABLE 5.1.1.1-2 Mapping of TPC Command Field in DCI
format 0/3/4 to absolute and accumulated .delta..sub.PUSCH, c
values TPC Command Accumulated Absolute .delta..sub.PUSCH, c Field
in DCI .delta..sub.PUSCH, c [dB] format 0/3/4 [dB] only DCI format
0/4 0 -1 -4 1 0 -1 2 1 1 3 3 4
TABLE-US-00003 TABLE 5.1.1.1-3 Mapping of TPC Command Field in DCI
format 3A to accumulated .delta..sub.PUSCH, c values TPC Command
Field Accumulated .delta..sub.PUSCH, c in DCI format 3A [dB] 0 -1 1
1
If the total transmit power of the UE would exceed {circumflex over
(P)}C.sub.MAX(i), the UE scales {circumflex over
(P)}.sub.PUSCH,c(i) for the serving cell c in subframe i such that
the condition
c .times. w .function. ( i ) P ^ P .times. U .times. S .times. C
.times. H , c .function. ( i ) .ltoreq. ( P ^ CMAX .times. ( i ) -
P ^ P .times. U .times. C .times. C .times. H .function. ( i ) )
##EQU00007##
is satisfied where {circumflex over (P)}.sub.PUCCH(i) is the linear
value of P.sub.PUCCH(i), {circumflex over (P)}.sub.PUSCH,c(i) is
the linear value of P.sub.PUSCH,c(i), {circumflex over
(P)}.sub.CMAX(i) is the linear value of the UE total configured
maximum output power P.sub.CMAX defined in [6] in subframe i and
w(i) is a scaling factor of {circumflex over (P)}.sub.PUSCH,c(i)
for serving cell c where 0.ltoreq.w(i).ltoreq.1. In case there is
no PUCCH transmission in subframe i {circumflex over
(P)}.sub.PUCCH(i)=0. If the UE has PUSCH transmission with UCI on
serving cell j and PUSCH without UCI in any of the remaining
serving cells, and the total transmit power of the UE would exceed
{circumflex over (P)}.sub.CMAX(i), the UE scales {circumflex over
(P)}.sub.PUSCH,c(i) for the serving cells without UCI in subframe i
such that the condition
c .noteq. j .times. w .times. ( i ) P ^ P .times. U .times. S
.times. C .times. H , c .function. ( i ) .ltoreq. ( P ^ CMAX
.times. ( i ) - P ^ P .times. UCCH , j .function. ( i ) )
##EQU00008##
is satisfied where {circumflex over (P)}.sub.PUSCH,j(i) is the
PUSCH transmit power for the cell with UCI and w(i) is a scaling
factor of {circumflex over (P)}.sub.PUSCH,c(i) for serving cell c
without UCI. In this case, no power scaling is applied to
{circumflex over (P)}.sub.PUSCH,j(i) unless
c .noteq. j .times. w .times. ( i ) P ^ P .times. U .times. S
.times. C .times. H , c .function. ( i ) = 0 ##EQU00009##
and the total transmit power of the UE still would exceed
P.sub.CMAX(i). Note that w(i) values are the same across serving
cells when w(i)>0 but for certain serving cells w(i) may be
zero. If the UE has simultaneous PUCCH and PUSCH transmission with
UCI on serving cell j and PUSCH transmission without UCI in any of
the remaining serving cells, and the total transmit power of the UE
would exceed {circumflex over (P)}.sub.CMAX(i), the UE obtains
{circumflex over (P)}.sub.PUSCH,c(i) according to
P ^ PUSCH , j .function. ( i ) = min .function. ( P ^ PUSCH , j
.function. ( i ) , ( P ^ C .times. M .times. A .times. X .function.
( i ) - P ^ P .times. U .times. C .times. C .times. H .function. (
i ) ) ) ##EQU00010## and ##EQU00010.2## c .noteq. j .times. w
.times. ( i ) P ^ P .times. U .times. S .times. C .times. H , c
.function. ( i ) .ltoreq. ( P ^ CMAX .times. ( i ) - P ^ PUCCH
.function. ( i ) - P ^ PUSCH , j .function. ( i ) )
##EQU00010.3##
If the UE is configured with multiple TAGs, and if the PUCCH/PUSCH
transmission of the UE on subframe i for a given serving cell in a
TAG overlaps some portion of the first symbol of the PUSCH
transmission on subframe i+1 for a different serving cell in
another TAG the UE shall adjust its total transmission power to not
exceed P.sub.CMAX on any overlapped portion. If the UE is
configured with multiple TAGs, and if the PUSCH transmission of the
UE on subframe i for a given serving cell in a TAG overlaps some
portion of the first symbol of the PUCCH transmission on subframe
i+1 for a different serving cell in another TAG the UE shall adjust
its total transmission power to not exceed P.sub.CMAX on any
overlapped portion. If the UE is configured with multiple TAGs, and
if the SRS transmission of the UE in a symbol on subframe i for a
given serving cell in a TAG overlaps with the PUCCH/PUSCH
transmission on subframe i or subframe i+1 for a different serving
cell in the same or another TAG the UE shall drop SRS if its total
transmission power exceeds P.sub.CMAX on any overlapped portion of
the symbol. If the UE is configured with multiple TAGs and more
than 2 serving cells, and if the SRS transmission of the UE in a
symbol on subframe i for a given serving cell overlaps with the SRS
transmission on subframe i for a different serving cell(s) and with
PUSCH/PUCCH transmission on subframe i or subframe i+1 for another
serving cell(s) the UE shall drop the SRS transmissions if the
total transmission power exceeds P.sub.CMAX on any overlapped
portion of the symbol. If the UE is configured with multiple TAGs,
the UE shall, when requested by higher layers, to transmit PRACH in
a secondary serving cell in parallel with SRS transmission in a
symbol on a subframe of a different serving cell belonging to a
different TAG, drop SRS if the total transmission power exceeds
P.sub.CMAX on any overlapped portion in the symbol. If the UE is
configured with multiple TAGs, the UE shall, when requested by
higher layers, to transmit PRACH in a secondary serving cell in
parallel with PUSCH/PUCCH in a different serving cell belonging to
a different TAG, adjust the transmission power of PUSCH/PUCCH so
that its total transmission power does not exceed P.sub.CMAX on the
overlapped portion.
5.1.1.2 Power Headroom
[0191] There are two types of UE power headroom reports defined. A
UE power headroom PH is valid for subframe i for serving cell
c.
Type 1:
[0192] If the UE transmits PUSCH without PUCCH in subframe i for
serving cell c, power headroom for a Type 1 report is computed
using
PH.sub.type1,c(i)=P.sub.CMAX,c(i)-{10
log.sub.10(M.sub.PUSCH,c(i))+P.sub.O_PUSCH,c+(j)+.alpha..sub.c(j)PL.sub.c-
+.DELTA..sub.TF,c(i)+f.sub.c(i)}[db]
where, P.sub.CMAX,c(i), M.sub.PUSCH,c(i), P.sub.O_PUSCH,c(i),
.alpha..sub.c(j), PL.sub.c, .DELTA..sub.TF,c(i) and f.sub.c(i) are
defined in clause 5.1.1.1.
[0193] If the UE transmits PUSCH with PUCCH in subframe i for
serving cell c, power headroom for a Type 1 report is computed
using
PH.sub.type1,c(t)={tilde over (P)}.sub.CMAX,c(i)-{10
log.sub.10(M.sub.PUSCH,c(i))+P.sub.O_PUSCH,c+(j)+.alpha..sub.c(j)PL.sub.c-
+.DELTA..sub.TF,c(i)+f.sub.c(i)}[db]
where, M.sub.PUSCH,c (i), P.sub.O_PUSCH,c(J), .alpha..sub.c(J),
PL.sub.c, .DELTA..sub.TF,c(i) and f.sub.c(i) are defined in clause
5.1.1.1. {acute over (P)}.sub.CMAX,c(i) is computed based on the
requirements in [6] assuming a PUSCH only transmission in subframe
i. For this case, the physical layer delivers {tilde over
(P)}.sub.CMAX,c(i) instead of P.sub.CMAX,c(i) to higher layers.
[0194] If the UE does not transmit PUSCH in subframe i for serving
cell c, power headroom for a Type 1 report is computed using
PH.sub.type1,c(t)={tilde over
(P)}.sub.CMAX,c(i)-{P.sub.O_PUSCH,c+(1)+.alpha..sub.c(1)PL.sub.c+f.sub.c(-
i)}[db]
where, {tilde over (P)}.sub.CMAX,c(i) is computed assuming MPR=0
dB, A-MPR=0 dB, P-MPR=0 dB and .DELTA.T.sub.c=0 dB, where MPR,
A-MPR, P-MPR and .DELTA.T.sub.c are defined in [6].
P.sub.O_PUSCH,c(1), .alpha..sub.c(1), PL.sub.c, and f.sub.c(i) are
defined in clause 5.1.1.1.
Type 2:
[0195] If the UE transmits PUSCH simultaneous with PUCCH in
subframe i for the primary cell, power headroom for a Type 2 report
is computed using
PH type .times. .times. 2 .function. ( i ) = P CMAX , c .function.
( i ) - 10 .times. log 10 .times. ( 10 ( 10 .times. log 10
.function. ( M PUSCH , c .function. ( i ) ) + P O .times. _ .times.
PUSCH , c .function. ( j ) + .alpha. c .function. ( j ) PL c +
.DELTA. TF , c .function. ( i ) + f c .function. ( i ) ) .times. /
.times. 10 + 10 ( P 0 .times. _ .times. PUCCH + PL c + h .function.
( n CQI , n HARQ , n SR ) + .DELTA. F .times. _ .times. PUCCH
.function. ( F ) + .DELTA. TxD .function. ( F ' ) + g .function. (
i ) ) .times. / .times. 10 ) .times. [ dB ] ##EQU00011##
where, P.sub.CMAX,c, M.sub.PUSCH,c(i), P.sub.O_PUSCH,c (j),
.alpha..sub.c(j), .DELTA..sub.TF,c(i) and f.sub.c(i) are the
primary cell parameters as defined in clause 5.1.1.1 and
P.sub.O_PUCCH, PL.sub.c, h(n.sub.CQI,n.sub.HARQ,n.sub.SR),
.DELTA..sub.F_PUCCH(F), .DELTA..sub.TxD(F') and g(i) are defined in
clause 5.1.2.1 If the UE transmits PUSCH without PUCCH in subframe
i for the primary cell, power headroom for a Type 2 report is
computed using
PH type .times. .times. 2 .function. ( i ) = P CMAX , c .function.
( i ) - 10 .times. log 10 .times. ( 10 ( 10 .times. log 10
.function. ( M PUSCH , c .function. ( i ) ) + P O .times. _ .times.
PUSCH , c .function. ( j ) + .alpha. c .function. ( j ) PL c +
.DELTA. TF , c .function. ( i ) + f c .function. ( i ) ) .times. /
.times. 10 + 10 ( P 0 .times. _ .times. PUCCH + PL c + g .function.
( i ) ) .times. / .times. 10 .times. ) .times. [ dB ]
##EQU00012##
where, P.sub.CMAX,c(i), M.sub.PUSCH,c(i), P.sub.O_PUSCH,c(J),
.alpha..sub.c(j), .DELTA..sub.TF,c(i) and f.sub.c(i) are the
primary cell parameters as defined in clause 5.1.1.1 and
P.sub.O_PUCCH, PL.sub.c and g(i) are defined in clause 5.1.2.1. If
the UE transmits PUCCH without PUSCH in subframe i for the primary
cell, power headroom for a Type 2 report is computed using
PH type .times. .times. 2 .function. ( i ) = P CMAX , c .function.
( i ) - 10 .times. log 10 .times. ( 10 ( P O .times. _ .times.
PUSCH , c .function. ( 1 ) + .alpha. c .function. ( 1 ) PL c + f c
.function. ( i ) ) .times. / .times. 10 + .times. 10 ( P 0 .times.
_ .times. PUCCH + PL c + h .function. ( n CQI , n HARQ , n SR ) +
.DELTA. F .times. _ .times. PUCCH .function. ( F ) + .DELTA. TxD
.function. ( F ' ) + g .function. ( i ) ) .times. / .times. 10 )
.times. [ dB ] ##EQU00013##
where, P.sub.O_PUSCH,c(1), .alpha..sub.c(1) and f.sub.c(i) are the
primary cell parameters as defined in clause 5.1.1.1,
P.sub.CMAX,c(i), P.sub.O_PUCCH, PL.sub.c,
h(n.sub.CQI,n.sub.HARQ,n.sub.SR), .DELTA..sub.F_PUCCH(F),
.DELTA..sub.TxD(F') and g(i) are also defined in clause 5.1.2.1. If
the UE does not transmit PUCCH or PUSCH in subframe i for the
primary cell, power headroom for a Type 2 report is computed
using
PH type .times. .times. 2 .function. ( I ) = P ~ CMAX , c
.function. ( i ) - 10 .times. log 10 .function. ( 10 ( P O .times.
_ .times. PUSCH , c .function. ( 1 ) + .alpha. c .function. ( 1 )
PL c + f c .function. ( i ) ) .times. / .times. 10 + 10 ( P 0
.times. _ .times. PUCCH + PL c + g .function. ( i ) ) .times. /
.times. 10 .times. ) .function. [ dB ] ##EQU00014##
where, {tilde over (P)}.sub.CMAX,c(a) is computed assuming MPR=0
dB, A-MPR=0 dB, P-MPR=0 dB and .DELTA.T.sub.c=0 dB, where MPR,
A-MPR, P-MPR and .DELTA.T.sub.c are defined in [6],
P.sub.O_PUSCH,c(1), .alpha..sub.c(1) and f.sub.c(i) are the primary
cell parameters as defined in clause 5.1.1.1 and P.sub.O_PUCCH,
PL.sub.c and g(i) are defined in clause 5.1.2.1.
[0196] The power headroom shall be rounded to the closest value in
the range [40; -23] dB with steps of 1 dB and is delivered by the
physical layer to higher layers.
5.1.2 Physical Uplink Control Channel
5.1.2.1 UE Behaviour
[0197] If serving cell c is the primary cell, the setting of the UE
Transmit power P.sub.PUCCH for the physical uplink control channel
(PUCCH) transmission in subframe i is defined by
P PUCCH .function. ( i ) = min .times. { P CMAX , c .function. ( i
) , .times. P 0 .times. _ .times. PUCCH + PL c + h .function. ( n
CQI . n HARQ , n SR ) + .DELTA. F .times. _ .times. PUCCH
.function. ( F ) + .DELTA. TxD .function. ( F ' ) + g .function. (
i ) } .function. [ dBm ] ##EQU00015##
If the UE is not transmitting or the primary cell, or the
accumulation of TPC command or PUCCH, the UE shall assume that the
UE transmit power P.sub.PUCCH for PUCCH in subframe i is computed
by
P.sub.PUCCH(i)=min{P.sub.CMAX,c(i),P.sub.0_PUCCH+PL.sub.c+g(i)}
[dBm]
where [0198] P.sub.CMAX,c (i) is the configured UE transmit power
defined in [6] in subframe i for serving cell c. If the UE
transmits PUSCH without PUCCH in subframe i for the serving cell c,
for the accumulation of TPC command for PUCCH, the UE shall assume
P.sub.CMAX,c(i) as given by clause 5.1.1.1. If the UE does not
transmit PUCCH and PUSCH in subframe i for the serving cell c, for
the accumulation of TPC command for PUCCH, the UE shall compute
P.sub.CMAX,c (i) assuming MPR=0 dB, A-MPR=0 dB, P-MPR=0 dB and
.DELTA.T.sub.c=0 dB, where MPR, A-MPR, P-MPR and .DELTA.T.sub.c are
defined in [6]. [0199] The parameter .DELTA..sub.F_PUCCH(F) is
provided by higher layers. Each .DELTA..sub.F_PUCCH(F) value
corresponds to a PUCCH format (F) relative to PUCCH format 1a,
where each PUCCH format (F) is defined in Table 5.4-1 of [3].
[0200] If the UE is configured by higher layers to transmit PUCCH
on two antenna ports, the value of .DELTA..sub.TxD(F) is provided
by higher layers where each PUCCH format F' is defined in Table
5.4-1 of [3]; otherwise, A.sub.TxD(F')=0. [0201]
h(n.sub.CQI,n.sub.HARQ,n.sub.SR) is a PUCCH format dependent value,
where n.sub.CQI corresponds to the number of information bits for
the channel quality information defined in clause 5.2.3.3 in [4].
n.sub.SR=1 if subframe i is configured for SR for the UE not having
any associated transport block for UL-SCH, otherwise n.sub.SR=0. If
the UE is configured with more than one serving cell, or the UE is
configured with one serving cell and transmitting using PUCCH
format 3, the value of n.sub.HARQ is defined in clause 10.1;
otherwise, n.sub.HARQ is the number of HARQ-ACK bits sent in
subframe i. [0202] For PUCCH format 1, 1a and 1b
h(n.sub.CQI,n.sub.HARQ,n.sub.SR)=0 [0203] For PUCCH format 1b with
channel selection, if the UE is configured with more than one
serving cell,
[0203] h .function. ( n CQI , n HARQ , n SR ) = ( n HARQ - 1 ) 2 ,
##EQU00016## [0204] otherwise, h(n.sub.CQI,n.sub.HARQ,n.sub.SR)=0
[0205] For PUCCH format 2, 2a, 2b and normal cyclic prefix
[0205] h .times. ( n CQI , n HARQ , n SR ) = { 10 .times. log 10
.function. ( n CQI 4 ) if .times. .times. n CQI .gtoreq. 4 0
.times. otherwise .times. ##EQU00017## [0206] For PUCCH format 2
and extended cyclic prefix
[0206] h .times. ( n CQI , n HARQ , n SR ) = { 10 .times. log 10
.function. ( n CQI + n HARQ 4 ) if .times. .times. n CQI + n HARQ
.gtoreq. 4 0 .times. otherwise .times. ##EQU00018## [0207] For
PUCCH format 3 and when UE transmits HARQ-ACK/SR without periodic
CSI, [0208] If the UE is configured by higher layers to transmit
PUCCH format 3 on two antenna ports, or if the UE transmits more
than 11 bits of HARQ-ACK/SR
[0208] h .times. ( n CQI , n HARQ , n SR ) = n HARQ + n SR - 1 3
##EQU00019## Otherwise ##EQU00019.2## h .times. ( n CQI , n HARQ ,
n SR ) = n HARQ + n SR - 1 2 ##EQU00019.3## [0209] For PUCCH format
3 and when UE transmits HARQ-ACK/SR and periodic CSI, [0210] If the
UE is configured by higher layers to transmit PUCCH format 3 on two
antenna ports, or if the UE transmits more than 11 bits of
HARQ-ACK/SR and CSI
[0210] h .times. ( n CQI , n HARQ , n SR ) = n HARQ + n SR + n CQI
- 1 3 ##EQU00020## Otherwise ##EQU00020.2## h .times. ( n CQI , n
HARQ , n SR ) = n HARQ + n SR + n CQI - 1 2 ##EQU00020.3## [0211]
P.sub.O_PUCCH is a parameter composed of the sum of a parameter
P.sub.O_NOMINAL_PUCCH provided by higher layers and a parameter
P.sub.O_UE_PUCCH provided by higher layers. [0212]
.delta..sub.PUCCH is a UE specific correction value, also referred
to as a TPC command, included in a PDCCH with DCI format
1A/1B/1D/1/2A/2/2B/2C/2D for the primary cell, or included in an
EPDCCH with DCI format 1A/1B/1D/1/2A/2/2B/2C/2D for the primary
cell, or sent jointly coded with other UE specific PUCCH correction
values on a PDCCH with DCI format 3/3A whose CRC parity bits are
scrambled with TPC-PUCCH-RNTI. [0213] If a UE is not configured for
EPDCCH monitoring, the UE attempts to decode a PDCCH of DCI format
3/3A with the UE's TPC-PUCCH-RNTI and one or several PDCCHs of DCI
format 1A/1B/1D/1/2A/2/2B/2C/2D with the UE's C-RNTI or SPS C-RNTI
on every subframe except when in DRX. [0214] If a UE is configured
for EPDCCH monitoring, the UE attempts to decode [0215] a PDCCH of
DCI format 3/3A with the UE's TPC-PUCCH-RNTI and one or several
PDCCHs of DCI format 1A/1B/1D/1/2A/2/2B/2C/2D with the UE's C-RNTI
or SPS C-RNTI as described in clause 9.1.1, and [0216] one or
several EPDCCHs of DCI format 1A/1B/1D/1/2A/2/2B/2C/2D with the
UE's C-RNTI or SPS C-RNTI, as described in clause 9.1.4. [0217] If
the UE decodes [0218] a PDCCH with DCI format
1A/1B/1D/1/2A/2/2B/2C/2D or [0219] an EPDCCH with DCI format
1A/1B/1D/1/2A/2/2B/2C/2D for the primary cell and the corresponding
detected RNTI equals the C-RNTI or SPS C-RNTI of the UE and the TPC
field in the DCI format is not used to determine the PUCCH resource
as in clause 10.1, the UE shall use the .delta..sub.PUCCH provided
in that PDCCH/EPDCCH. [0220] else [0221] if the UE decodes a PDCCH
with DCI format 3/3A, the UE shall use the .delta..sub.PUCCH
provided in that PDCCH [0222] else the UE shall set
.delta..sub.PUCCH=0 dB.
[0222] g .function. ( i ) = g .function. ( i - 1 ) + m = 0 M - 1
.times. .times. .delta. PUCCH .function. ( i - k m ) ##EQU00021##
[0223] where g(i) is the current PUCCH power control adjustment
state and where g(0) is the first value after reset. [0224] For
FDD, M=1 and k.sub.0=4. [0225] For TDD, values of M and k.sub.m are
given in Table 10.1.3.1-1. [0226] The .delta..sub.PUCCH dB values
signalled on PDCCH with DCI format 1A/1B/1D/1/2A/2/2B/2C/2D or
EPDCCH with DCI format 1A/1B/1D/1/2A/2/2B/2C/2D are given in Table
5.1.2.1-1. If the PDCCH with DCI format 1/1A/2/2A/2B/2C/2D or
EPDCCH with DCI format 1/1A/2A/2/2B/2C/2D is validated as an SPS
activation PDCCH/EPDCCH, or the PDCCH/EPDCCH with DCI format 1A is
validated as an SPS release PDCCH/EPDCCH, then .delta..sub.PUCCH is
0 dB. [0227] The .delta..sub.PUCCH dB values signalled on PDCCH
with DCI format 3/3A are given in Table 5.1.2.1-1 or in Table
5.1.2.1-2 as semi-statically configured by higher layers. [0228] If
P.sub.O_UE_PUCCH value is changed by higher layers,
[0228] g(0)=0 [0229] Else
[0229] Sg(0)=.DELTA.P.sub.rampup+.delta..sub.msg2, where [0230]
.delta..sub.msg2 is the TPC command indicated in the random access
response corresponding to the random access preamble transmitted in
the primary cell, see clause 6.2 and [0231] If UE is transmitting
PUCCH in subframe i,
[0231] .DELTA. .times. .times. P rampup = min .times. [ { max
.function. ( 0 , P CMAX , c - ( P 0 .times. _ .times. PUCCH + PL c
+ h .function. ( n CQI , n HARQ , n SR ) + .DELTA. F .times. _
.times. PUCCH .function. ( F ) + .DELTA. TxD .function. ( F ' ) ) )
} , .DELTA. .times. .times. P rampuprequested ] ##EQU00022## [0232]
Otherwise, [0233] .DELTA.p.sub.rampup=mm[{max(0,
P.sub.CMAX,c-(P.sub.O_PUCCH+PL.sub.c))},.DELTA.P.sub.rampuprequested]
and .DELTA.P.sub.rampuprequested is provided by higher layers and
corresponds to the total power ramp-up requested by higher layers
from the first to the last preamble in the primary cell [0234] If
UE has reached P.sub.CMAX,c(i) for the primary cell, positive TPC
commands for the primary cell shall not be accumulated [0235] If UE
has reached minimum power, negative TPC commands shall not be
accumulated [0236] UE shall reset accumulation [0237] when
P.sub.O_UE_PUCCH value is changed by higher layers [0238] when the
UE receives a random access response message for the primary cell
[0239] g(i)=g(i-1) if i is not an uplink subframe in TDD.
TABLE-US-00004 [0239] TABLE 5.1.2.1-1 Mapping of TPC Command Field
in DCI format 1A/1B/1D/1/2A/2B/2C/2D/2/3 to .delta..sub.PUCCH
values TPC Command Field in DCI format 1A/1B/ .delta..sub.PUCCH
1D/1/2A/2B/2C/2D/2/3 [dB] 0 -1 1 0 2 1 3 3
TABLE-US-00005 TABLE 5.1.2.1-2 Mapping of TPC Command Field in DCI
format 3A to .delta..sub.PUCCH values TPC Command Field
.delta..sub.PUCCH in DCI format 3A [dB] 0 -1 1 1
5.1.3 Sounding Reference Symbol (SRS)
5.1.3.1 UE Behaviour
[0240] The setting of the UE Transmit power P.sub.SRS for the SRS
transmitted on subframe t for serving cell c is defined by
P SRS , c .function. ( i ) = min .times. { P CMAX , c .function. (
i ) , P SRS .times. _ .times. OFFSET , c .function. ( m ) + 10
.times. log 10 .function. ( M SRS , c ) + P O .times. _ .times.
PUSCH , c .function. ( j ) + .alpha. c .function. ( j ) PL c + f c
.function. ( i ) } .function. [ dBm ] ##EQU00023##
where [0241] P.sub.CMAX,c (i) is the configured UE transmit power
defined in [6] in subframe t for serving cell c. [0242]
P.sub.SRS_OFFSET,c(m) is semi-statically configured by higher
layers for m=0 and m=1 for serving cell c.
[0243] For SRS transmission given trigger type 0 then m=0 and for
SRS transmission given trigger type 1 then m=1. [0244] M.sub.SRS,c
is the bandwidth of the SRS transmission in subframe t for serving
cell c expressed in number of resource blocks. [0245] f.sub.c(t) is
the current PUSCH power control adjustment state for serving cell
c, see clause 5.1.1.1. [0246] P.sub.O_PUSCH,c(j) and
.alpha..sub.c(i) are parameters as defined in clause 5.1.1.1, where
j=1. If the total transmit power of the UE for the Sounding
Reference Symbol in an SC-FDMA symbol would exceed {circumflex over
(P)}.sub.CMAX(i), the UE scales {circumflex over (P)}.sub.SRS,c(t)
for the serving cell c and the SC-FDMA symbol in subframe t such
that the condition
[0246] c .times. w .function. ( i ) P ^ SRS , c .function. ( i )
.ltoreq. P ^ CMAX .function. ( i ) ##EQU00024##
is satisfied where {circumflex over (P)}.sub.SRS,c(t) is the linear
value of P.sub.SRS,c(i), {circumflex over (P)}.sub.CMAX(i) is the
linear value of P.sub.CMAX defined in [6] in subframe t and w(i) is
a scaling factor of {circumflex over (P)}.sub.SRS,c(t) for serving
cell c where 0<w(i).ltoreq.1. Note that w(i) values are the same
across serving cells. If the UE is configured with multiple TAGs
and the SRS transmission of the UE in an SC-FDMA symbol for a
serving cell in subframe i in a TAG overlaps with the SRS
transmission in another SC-FDMA symbol in subframe i for a serving
cell in another TAG, and if the total transmit power of the UE for
the Sounding Reference Symbol in the overlapped portion would
exceed {circumflex over (P)}.sub.CMAX(i), the UE scales {circumflex
over (P)}.sub.SRS,c(i) for the serving cell c and each of the
overlapped SRS SC-FDMA symbols in subframe i such that the
condition
c .times. w .function. ( i ) P ^ SRS , c .function. ( i ) .ltoreq.
P ^ CMAX .function. ( i ) ##EQU00025##
is satisfied where {circumflex over (P)}.sub.SRS,c(z) is the linear
value of P.sub.SRS,c(i), {circumflex over (P)}C.sub.MAX(i) is the
linear value of P.sub.CMAX defined in [6] in subframe i and w(i) is
a scaling factor of {circumflex over (P)}.sub.SRS,c(i) for serving
cell c where 0<w(i).ltoreq.1. Note that w(i) values are the same
across serving cells. Annex 2: Excerpt from 3GPP TS 36.331
v11.5.0
6.3.2 Radio Resource Control Information Elements
[0247] [ . . . ] [0248] RadioResourceConfigCommon The IE
RadioResourceConfigCommonSIB and IE RadioResourceConfigCommon are
used to specify common radio resource configurations in the system
information and in the mobility control information, respectively,
e.g., the random access parameters and the static physical layer
parameters.
TABLE-US-00006 [0248] RadioResourceConfigCommon information element
-- ASN1START RadioResourceConfigCommonSIB ::= SEQUENCE {
rach-ConfigCommon RACH-ConfigCommon, bcch-Config BCCH-Config,
pcch-Config PCCH-Config, prach-Config PRACH-ConfigSIB,
pdsch-ConfigCommon PDSCH-ConfigCommon, pusch-ConfigCommon
PUSCH-ConfigCommon, pucch-ConfigCommon PUCCH-ConfigCommon,
soundingRS-UL-ConfigCommon SoundingRS-UL-ConfigCommon,
uplinkPowerControlCommon UplinkPowerControlCommon,
ul-CyclicPrefixLength UL-CyclicPrefixLength, ..., [ [
uplinkPowerControlCommon-v1020 UplinkPowerControlCommon-v1020
OPTIONAL -- Need OR ] ] } RadioResourceConfigCommon ::= SEQUENCE {
rach-ConfigCommon RACH-ConfigCommon OPTIONAL, -- Need ON
prach-Config PRACH-Config, pdsch-ConfigCommon PDSCH-ConfigCommon
OPTIONAL, -- Need ON pusch-ConfigCommon PUSCH-ConfigCommon,
phich-Config PHICH-Config OPTIONAL, -- Need ON pucch-ConfigCommon
PUCCH-ConfigCommon OPTIONAL, -- Need ON soundingRS-UL-ConfigCommon
SoundingRS-UL-ConfigCommon OPTIONAL, -- Need ON
uplinkPowerControlCommon UplinkPowerControlCommon OPTIONAL, -- Need
ON antennaInfoCommon AntennaInfoCommon OPTIONAL, -- Need ON p-Max
P-Max OPTIONAL, -- Need OP tdd-Config TDD-Config OPTIONAL, -- Cond
TDD ul-CyclicPrefixLength UL-CyclicPrefixLength, ..., [ [
uplinkPowerControlCommon-v1020 UplinkPowerControlCommon-v1020
OPTIONAL -- Need ON ] ], ] ] tdd-Config-v1130 TDD-Config-v1130
OPTIONAL -- Cond TDD3 ] ] } RadioResourceConfigCommonSCell-r10 ::=
SEQUENCE { -- DL configuration as well as configuration applicable
for DL and UL nonUL-Configuration-r10 SEQUENCE { -- 1: Cell
characteristics d1-Bandwidth-r10 ENUMERATED {n6, n15, n25, n50,
n75, n100}, -- 2: Physical configuration, general
antennaInfoCommon-r10 AntennaInfoCommon,
mbsfn-SubframeConfigList-r10 MBSEN-SubframeConfigList OPTIONAL, --
Need OR -- 3: Physical configuration, control phich-Config-r10
PHICH-Config, -- 4: Physical configuration, physical channels
pdsch-ConfigCommon-r10 PDSCH-ConfigCommon, tdd-Config-r10
TDD-Config OPTIONAL -- Cond TDDSCell }, -- UL configuration
ul-Configuration-r10 SEQUENCE { ul-FreqInfo-r10 SEQUENCE
ul-CarrierFreq-r10 ARFCN-ValueEUTRA OPTIONAL, -- Need OP
ul-Bandwidth-r10 ENUMERATED {n6, n15, n25, n50, n75, n1001
OPTIONAL, -- Need OP additionalSpectrumEmissionSCell-r10
AdditionalSpectrumEmission }, p-Max-r10 P-Max OPTIONAL, -- Need OP
uplinkPowerControlCommonSCell-r10
UplinkPowerControlCommonSCell-r10, -- A special version of IE
UplinkPowerControlCommon may be introduced -- 3: Physical
configuration, control soundingRS-UL-ConfigCommon-r10
SoundingRS-UL-ConfigCommon, ul-CyclicPrefixLength-r10
UL-CyclicPrefixLength, -- 4: Physical configuration, physical
channels prach-ConfigSCell-r10 PRACH-ConfigSCell-r10 OPTIONAL, --
Cond TDD-OR-NoR11 pusch-ConfigCommon-r10 PUSCH-ConfigCommon }
OPTIONAL, -- Need OR ..., [ [ ul-CarrierFreq-v1090
ARFCN-ValueEUTRA-v9e0 OPTIONAL -- Need OP ] ], [ [
rach-ConfigCommonSCell-r11 RACH-ConfigCommonSCell-r11 OPTIONAL, --
Cond UL prach-ConfigSCell-r11 PRACH-Config OPTIONAL, -- Cond UL
tdd-Config-v1130 TDD-Config-v1130 OPTIONAL, -- Cond TDD2
uplinkPowerControlCommonSCell-v1130
UplinkPowerControlCommonSCell-v1130 OPTIONAL -- Cond UL ] ] }
BCCH-Config ::= SEQUENCE { modificationPeriodCoeff ENUMERATED fn2,
n4, n8, n16} } PCCH-Config ::= SEQUENCE { defaultPagingCycle
ENUMERATED { rf32, rf64, rf128, rf256}, nB ENUMERATED fourT, twoT,
oneT, halfT, quarterT, oneEighthT, oneSixteenthT, oneThirtySecondT)
} UL-CyclicPrefixLength ::= ENUMERATED {len1, len2} -- ASN1STOP
TABLE-US-00007 RadioResourceConfigCommon field descriptions
additionalSpectrumEmissionSCell The UE requirements related to IE
AdditionalSpectrumEmissionSCell are defined in TS 36.101 [42]
defaultPagingCycle Default paging cycle, used to derive `T` in TS
36.304 [4]. Value rf32 corresponds to 32 radio frames, rf64
corresponds to 64 radio frames and so on. modificationPeriodCoeff
Actual modification period, expressed in number of radio frames =
modificationPeriodCoeff * defaultPagingCycle. n2 corresponds to
value 2, n4 corresponds to value 4, n8 corresponds to value 8 and
n16 corresponds to value 16. nB Parameter: nB is used as one of
parameters to derive the Paging Frame and Paging Occasion according
to TS 36.304 [4]. Value in multiples of T as defined in TS 36.304
[4]. A value of fourT corresponds to 4 * T, a value of twoT
corresponds to 2*T and so on. p-Max Pmax to be used in the target
cell. If absent the UE applies the maximum power according to the
UE capability. ul-Bandwidth Parameter: transmission bandwidth
configuration, N.sub.RB, in uplink, see TS 36.101 [42, table
5.6-1]. Value n6 corresponds to 6 resource blocks, n15 to 15
resource blocks and so on. If for FDD this parameter is absent, the
uplink bandwidth is equal to the downlink bandwidth. For TDD this
parameter is absent and it is equal to the downlink bandwidth.
ul-CarrierFreq For FDD: If absent, the (default) value determined
from the default TX-RX frequency separation defined in TS 36.101
[42, table 5.7.3-1] applies. For TDD: This parameter is absent and
it is equal to the downlink frequency. UL-CyclicPrefixLength
Parameter: Uplink cyclic prefix length see 36.211 [21, 5.2.1] where
len1 corresponds to normal cyclic prefix and len2 corresponds to
extended cyclic prefix.
TABLE-US-00008 Conditional presence Explanation TDD The field is
optional for TDD, Need ON; it is not present for FDD and the UE
shall delete any existing value for this field. TDD2 If tdd-Config
or tdd-Config-r10 is present, the field is optional, Need OR.
Otherwise the field is not present and the UE shall delete any
existing value for this field. TDD3 If tdd-Config or tdd-Config-r10
is present, the field is optional, Need OR. Otherwise the field is
not present. TDD-OR-NoR11 If prach-ConfigSCell-r11 is absent, the
field is optional for TDD, Need OR. Otherwise the field is not
present and the UE shall delete any existing value for this field.
TDDSCell This field is mandatory present for TDD; it is not present
for FDD and the UE shall delete any existing value for this field.
UL If the SCell is part of the STAG and if ul-Configuration is
included, the field is optional, Need OR. Otherwise the field is
not present and the UE shall delete any existing value for this
field.
* * * * *