5.1.4 Power allocation for EUTRA dual connectivity
36.2133GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Physical layer proceduresRelease 17TS
If a UE is configured with multiple cell groups, the UE is not expected to be configured with SRS trigger type 2, and
– if the UE supports synchronous dual connectivity but does not support asynchronous dual connectivity, or if the UE supports both synchronous dual connectivity and asynchronous dual connectivity and if the higher layer parameter powerControlMode indicates dual connectivity power control mode 1
– if the maximum uplink timing difference between transmitted signals to different serving cells including serving cells belonging to different CGs is equal to or less than the minimum requirement for maximum transmission timing difference for synchronous dual connectivity defined in [10].
– The UE shall use the procedures described in sub clause 5.1.4.1.
– If a PRACH transmission of the UE on the Pcell starting in subframe 
of MCG overlaps in time domain with another PRACH transmission of the UE starting in subframe 
of SCG, and if subframe 
and subframe 
overlap in time with more than one symbol, and if the total power of both the PRACH transmissions would exceed 
, the UE shall transmit the PRACH on the Pcell using the preamble transmission power 
described in Clause 6.1. The UE may drop or adjust the power of the PRACH transmission in subframe 
of SCG such that the total power does not exceed 
, where 
is the linear value configured transmitted power for Dual Connectivity for the subframe pair 
as described in [6]. If the UE drops the PRACH transmission, it sends power ramping suspension indicator to the higher layers. If the UE adjusts the power of PRACH transmission, it may send power ramping suspension indicator to the higher layers.
– if the UE supports both synchronous dual connectivity and asynchronous dual connectivity and if the higher layer parameter powerControlMode does not indicate dual connectivity power control mode 1
– The UE shall use the procedures described in sub clause 5.1.4.2 .
– If a PRACH transmission on the Pcell in subframe 
of MCG overlaps in time another PRACH transmission in subframe 
of SCG, and if the time difference between the start of the two PRACH transmissions is less than 
, and if the transmission timing of the PRACH on the Pcell (according to Clause 6.1.1) is such that the UE is ready to transmit the PRACH on Pcell at least one subframe before subframe 
of MCG, and if the total power of both the PRACH transmissions exceeds 
, the UE shall transmit the PRACH on the Pcell using the preamble transmission power PPRACH described in Clause 6.1. The UE may drop or adjust the power of the PRACH transmission in subframe 
of SCG such that the total power does not exceed 
, where 
is the linear value configured transmitted power for Dual Connectivity for the subframe pair 
as described in [6]. If the UE drops the PRACH transmissions, it sends power ramping suspension indicator to the higher layers. If the UE adjusts the power of PRACH transmission, it may send power ramping suspension indicator to the higher layers.
5.1.4.1 Dual connectivity power control Mode 1
If the UE PUSCH/PUCCH transmission(s) in subframe 
of CG1 overlap in time with PUSCH/PUCCH transmission(s) in more than one symbol of subframe 
of CG2 or if at least the last symbol the UE PUSCH/PUCCH transmission(s) in subframe 
of CG1 overlap in time with SRS transmission(s) of subframe 
, and
– if the UE has a PUCCH/PUSCH transmission with UCI including HARQ-ACK/SR in subframe 
of CG1: If the UE has a PUCCH transmission with UCI including HARQ-ACK/SR in subframe 
of CG1 and if 
would exceed 
, the UE scales 
such that the condition 
is satisfied where 
and 
. If 
would not exceed 
, 
. If the UE has a PUSCH transmission with UCI including HARQ-ACK in subframe 
of serving cell 
, and if 
would exceed
, the UE scales 
such that the condition 
is satisfied where 
and 
. If 
would not exceed 
, 
. 
is determined as follows 
;
where
– 
;
– if CG1 is MCG and CG2 is SCG,
– 
;
– 
;
– if CG1 is SCG and CG2 is MCG
– if the UE has a PUCCH transmission with UCI including HARQ-ACK/SR subframe 
of CG2,
– 
;
– 
– else if the UE has a PUSCH transmission with UCI including HARQ-ACK in subframe 
of serving cell 
,
– 
;
– 
;
– otherwise,
– 
;
– 
– if the UE has a PUCCH/PUSCH transmission with UCI not including HARQ-ACK/SR in subframe 
of CG1: If the UE has a PUCCH transmission with UCI not including HARQ-ACK/SR in subframe 
of CG1 and if 
would exceed 
, the UE scales 
such that the condition 
is satisfied where 
and 
. If 
would not exceed 
, 
. If the UE has a PUSCH transmission with UCI not including HARQ-ACK in subframe 
of serving cell 
, and if 
would exceed
, the UE scales 
such that the condition 
is satisfied where 
and 
. If 
would not exceed 
, 
.
is determined as follows
where
– 
if the UE has a PUCCH transmission with HARQ-ACK/SR and a PUSCH transmission with UCI not including HARQ-ACK in subframe 
of CG1, otherwise, 
.
– if CG1 is MCG and CG2 is SCG
– if the UE has a PUCCH transmission with UCI including HARQ-ACK/SR in subframe 
of CG2,
– 
– 
;
– else if the UE has a PUSCH transmission with UCI including HARQ-ACK in subframe 
of serving cell 
,
– 
– 
;
– otherwise,
– 
– 
– if CG1 is SCG and CG2 is MCG
– if the UE has a PUCCH transmission in subframe 
of CG2 and/or a PUSCH transmission with UCI in in subframe 
of serving cell 
– 
– 
where, 
if the UE does not have a PUCCH transmission in subframe 
of CG2; 
if the UE does not have a PUSCH transmission with UCI in subframe 
of CG2;
– otherwise
– 
– 
– If the UE has PUSCH transmission(s) without UCI in subframe 
of CG1, the UE shall determine
where
– if the UE has a PUCCH transmission in subframe 
of CG1 and/or a PUSCH transmission with UCI in in subframe 
of serving cell 
,
where 
if the UE does not have a PUCCH transmission in subframe 
of CG1,
if the UE does not have a PUSCH transmission with UCI in subframe 
of CG1; otherwise
;
– if CG1 is MCG and CG2 is SCG
– if the UE has a PUCCH transmission in subframe 
of CG2 and/or a PUSCH transmission with UCI in in subframe of serving cell 
– 
– 
where, 
if the UE does not have a PUCCH transmission in subframe 
of CG2; 
if the UE does not have a PUSCH transmission with UCI in subframe 
of CG2;
– otherwise
– 
– 
;
– if CG1 is SCG and CG2 is MCG
– 
– 
;
– If the total transmit power of all the PUSCH transmission(s) without UCI in subframe 
of CG1 would exceed 
, the UE scales 
for each serving cell 
with a PUSCH transmission without UCI in subframe 
such that the condition
is satisfied, where 
, and where 
is a scaling factor of 
for serving cell 
where 
. Note that
values are the same across serving cells within a cell group when
but for certain serving cells within the cell group 
may be zero. If the total transmit power of all the PUSCH transmission(s) without UCI in subframe 
of CG1 would not exceed 
, 
.
where
– 
is the linear value of configured transmitted power for Dual Connectivity for the subframe pair 
as described in [6];
– if CG1 is MCG and CG2 is SCG
– 
is the linear value of 
corresponding to PUCCH transmission on the primary cell ; 
is the linear value of 
corresponding to PUCCH transmission on the PSCell.
– 
;
– if CG1 is SCG and CG2 is MCG;
– 
is the linear value of 
corresponding to PUCCH transmission on the PSCell; 
is the linear value of 
corresponding to PUCCH transmission on the primary cell.
– 
;
– 
is the linear value of 
for subframe 
of serving cell of serving cell 
, and 
is the linear value of 
for subframe 
of serving cell of serving cell 
.
– 
and 
are given by Table 5.1.4.2-1 according to higher layer parameters p-MeNB and p-SeNB respectively;
– If the UE has a PRACH transmission for CG1 overlapping with subframe 
of CG1, 
is the linear value of the transmission power of that PRACH transmission; otherwise, 
;
– If the UE has a PRACH transmission for CG2 overlapping with subframe 
of CG2, 
is the linear value of the transmission power of that PRACH transmission; otherwise, 
.
– 
is determined as follows
– if the PUSCH/PUCCH is not transmitted in the last symbol of subframe 
of CG1, or if the UE does not have an SRS transmission in subframe 
of serving cell 
or if the UE drops SRS transmission in subframe 
of serving cell 
due to collision with PUCCH in subframe 
of serving cell 
– 
;
– if the UE has an SRS transmission and does not have a PUCCH/PUSCH transmission in subframe 
of serving cell 
– 
;
– if the UE has an SRS transmission and a has PUCCH transmission, and does not have a PUSCH transmission in subframe 
of serving cell 
– 
– if the UE has an SRS transmission and a has PUSCH transmission, and does not have a PUCCH transmission in subframe 
of serving cell 
– 
– if the UE has an SRS transmission and has a PUSCH transmission and a PUCCH transmission in in subframe 
of serving cell 
– 
If the total transmit power for the Sounding Reference Symbol in an SC-FDMA symbol across all the serving cells within a TAG of a cell group CG1 would exceed
, the UE scales 
for the serving cell 
and the SC-FDMA symbol in subframe 
such that the condition 
is satisfied, where 
is the transmission power of SRS after scaling and where 
is the linear value of 
described in Clause 5.1.3.1, and
is a scaling factor of 
for serving cell 
where 
. Note that
values are the same across serving cells within the same CG.
If the UE is configured with multiple TAGs within CG1 and the SRS transmission of the UE in an SC-FDMA symbol for a serving cell in subframe 
in a TAG belonging to CG1 overlaps with the SRS transmission in another SC-FDMA symbol in subframe 
for a serving cell in another TAG belonging to CG1, and if the total transmit power of the UE for the Sounding Reference Symbol in the overlapped portion would exceed 
, the UE scales 
for the serving cell 
and each of the overlapped SRS SC-FDMA symbols in subframe 
such that the condition 
is satisfied, where 
is the transmission power of SRS after scaling, and where 
is a scaling factor of 
for serving cell 
where 
. Note that
values are the same across serving cells within a cell group.
is determined as follows
where
– if CG1 is MCG and CG2 is SCG
– 
– 
– if CG1 is SCG and CG2 is MCG
– 
– 
– if the UE has no PUCCH transmission or has a shortened PUCCH transmission in subframe 
of CG2, 
; otherwise 
– if the UE has no PUSCH transmission in the last symbol of subframe 
of serving cell 
, 
; otherwise
– if the UE has PRACH transmission in CG2 that overlaps with the last symbol of subframe 
of CG2, 
; otherwise 
For both cell groups
– if the PUCCH/PUSCH transmission of the UE on subframe 
for a given serving cell in a TAG of CG1 overlaps some portion of the first symbol of the PUSCH transmission on subframe 
for a different serving cell in another TAG of CG1 and/or overlaps with the PUCCH/PUSCH transmission on subframe 
for a serving cell in another TAG of CG2, the UE shall adjust its total transmission power of all CGs such that the total transmission power of the UE across all CGs does not exceed 
on any overlapped portion.
– if the PUSCH transmission of the UE on subframe 
for a given serving cell in a TAG of CG1 overlaps some portion of the first symbol of the PUCCH transmission on subframe 
for a different serving cell in another TAG of CG1 and/or overlaps with the PUCCH/PUSCH transmission on subframe 
for a serving cell in another TAG of CG2, the UE shall adjust its total transmission power of all CGs such that the total transmission power of the UE across all CGs does not exceed 
on any overlapped portion.
– if the SRS transmission of the UE in a symbol on subframe 
for a given serving cell in a TAG of CG1 overlaps with the PUCCH/PUSCH transmission on subframe 
or subframe 
for a different serving cell in the same or another TAG of CG1 and/or overlaps with the PUCCH/PUSCH transmission on subframe 
for a serving cell of CG2, the UE shall drop the SRS in CG1 if its total transmission power across all CGs exceeds 
on any overlapped portion of the symbol.
– if the SRS transmission of the UE in a symbol on subframe 
for a given serving cell in CG1 overlaps with the SRS transmission on subframe for a different serving cell(s) in CG1 or overlaps with SRS transmission on subframe 
for a serving cell(s) in CG2, and if the SRS transmissions overlap with PUSCH/PUCCH transmission on subframe 
or subframe 
for another serving cell(s) in CG1, and/or if the SRS transmissions overlap with PUSCH/PUCCH transmission on subframe 
for a serving cell of CG2, the UE shall drop the SRS transmissions in CG1 if its total transmission power across all CGs exceeds 
on any overlapped portion of the symbol.
– UE shall, when requested by higher layers, to transmit PRACH on subframe 
or subframe 
in a secondary serving cell in CG1 and/or to transmit PRACH on subframe
in a serving cell in CG2 in parallel with SRS transmission in a symbol on subframe 
of a different serving cell belonging to a different TAG of CG1, drop SRS in CG1 if its total transmission power across all CGs exceeds 
on any overlapped portion of the symbol.
– UE shall, when requested by higher layers, to transmit PRACH on subframe 
in a secondary serving cell in CG1 and/or to transmit PRACH on subframe 
in a serving cell in CG2 in parallel with PUSCH/PUCCH on subframe 
in a different serving cell belonging to a different TAG of CG1, adjust the transmission power of PUSCH/PUCCH in CG1 so that the total transmission power of the UE across all CGs does not exceed 
on the overlapped portion.
5.1.4.2 Dual connectivity power control Mode 2
If subframe 
of CG1 overlaps in time with subframe 
and subframe 
of CG2, and if the UE has transmission(s) in subframe 
of CG1,
– if the UE determines based on higher layer signalling that transmission(s) in subframe 
of CG1 cannot overlap in time with transmission(s) in subframe 
of CG2, the UE shall determine
– Otherwise, the UE shall determine
.
where,
– 
– 
is the linear value of configured transmitted power for Dual Connectivity for the subframe pair 
, as described in [6];
– 
, if the UE does not have a PUSCH transmission in serving cell 
;
– 
if the UE does not have a PUCCH transmission in CG1;
– 
if the UE has no transmission of PUCCH, PUSCH, or SRS in subframe 
of CG2;
– 
, and 
if CG1 is MCG and CG2 is SCG;
– 
, and 
, if CG1 is SCG and CG2 is MCG;
– 
and 
are given by Table 5.1.4.2-1 according to higher layer parameters p-MeNB and p-SeNB respectively;
– If the UE has a PRACH transmission for CG1 overlapping with subframe 
of CG1, 
is the linear value of the transmission power of that PRACH transmission; otherwise, 
.
– If the UE has a PRACH transmission for CG2 overlapping with subframe 
of CG2, and if the transmission timing of the PRACH transmission (according to Clause 6.1.1) is such that the UE is ready to transmit the PRACH at least one subframe before subframe 
of CG2, 
is the linear value of the transmission power of that PRACH transmission; otherwise, 
.
– If the UE has a PRACH transmission for CG2 overlapping with subframe 
of CG2, 
is the linear value of the transmission power of that PRACH transmission; otherwise, 
.
– 
is determined as follows
– if the UE does not have an SRS transmission in subframe 
of serving cell 
or if the UE drops the SRS transmission in subframe 
of serving cell 
due to collision with a PUCCH transmission in subframe 
of serving cell 
– 
;
– if the UE has an SRS transmission and does not have a PUCCH/PUSCH transmission in subframe 
of serving cell 
– 
;
– if the UE has an SRS transmission and a has PUCCH transmission, and does not have a PUSCH transmission in subframe 
of serving cell 
– 
– if the UE has an SRS transmission and a has PUSCH transmission, and does not have a PUCCH transmission in subframe 
of serving cell 
– 
– if the UE has an SRS transmission and has a PUSCH transmission and a PUCCH transmission in subframe 
of serving cell 
– 
where 
is the linear value of 
described in Clause 5.1.3.1.
If 
would exceed 
, the UE scales 
such that the condition 
is satisfied where
– if CG1 is MCG, 
is the linear value of 
corresponding to PUCCH transmission on the primary cell, in case there is no PUCCH transmission in subframe i on the primary cell 
.
– if CG1 is SCG , 
is the linear value of 
corresponding to PUCCH transmission on PSCell, in case there is no PUCCH transmission in subframe i on the PSCell 
. 
is the linear value of 
– 
is a scaling factor of 
.
If the UE has PUSCH transmission with UCI on serving cell 
, and 
would exceed 
the UE scales 
such that the condition 
is satisfied where 
is the linear value of the PUSCH transmit power for the cell with UCI, and 
is a scaling factor of 
for serving cell 
.
If the total transmit power across all the serving cells of a cell group CG1 would exceed 
, the UE scales 
for the serving cell 
in subframe i such that the condition
is satisfied; and
is a scaling factor of 
for serving cell 
where 
.
If the UE has PUSCH transmission with UCI on serving cell 
and PUSCH without UCI in any of the remaining serving cells belonging to CG1, and the total transmit power across all the serving cells of CG1 would exceed 
, the UE scales 
for the serving cells belonging to CG1 without UCI in subframe i such that the condition 
is satisfied;
where 
is the PUSCH transmit power for the cell with UCI and
is a scaling factor of 
for serving cell 
without UCI. In this case, no power scaling is applied to 
unless
and the total transmit power across all of the serving cells of the CG1 still would exceed 
.
If the UE has simultaneous PUCCH and PUSCH transmission with UCI on serving cell
and PUSCH transmission without UCI in any of the remaining serving cells belonging to CG1, and the total transmit power across all the serving cells of the CG1 would exceed 
, the UE obtains 
according to 
and 
where
– if CG1 is MCG, 
is the linear value of 
corresponding to PUCCH transmission on the primary cell.
– if CG1 is SCG , 
is the linear value of 
corresponding to PUCCH transmission on PSCell.
Note that
values are the same across serving cells within a cell group when
but for certain serving cells within the cell group 
may be zero.
If the total transmit power for the Sounding Reference Symbol in an SC-FDMA symbol across all the serving cells within a TAG of a cell group CG1 would exceed 
, the UE scales 
for the serving cell 
and the SC-FDMA symbol in subframe i such that the condition
is satisfied where 
is the linear value of 
described in Clause 5.1.3.1, and
is a scaling factor of 
for serving cell 
where 
. Note that
values are the same across serving cells within the same CG.
If the UE is configured with multiple TAGs within CG1 and the SRS transmission of the UE in an SC-FDMA symbol for a serving cell in subframe 
in a TAG belonging to CG1 overlaps with the SRS transmission in another SC-FDMA symbol in subframe 
for a serving cell in another TAG belonging to CG1, and if the total transmit power of the UE for the Sounding Reference Symbol in the overlapped portion would exceed
, the UE scales 
for the serving cell 
and each of the overlapped SRS SC-FDMA symbols in subframe 
such that the condition
is satisfied where 
is the linear value of 
described in Clause 5.1.3.1, and
is a scaling factor of 
for serving cell 
where 
. Note that
values are the same across serving cells within the same CG.
For a cell group CG1
– if the UE is configured with multiple TAGs within CG1, and if the PUCCH/PUSCH transmission of the UE on subframe 
for a given serving cell in a TAG of CG1 overlaps some portion of the first symbol of the PUSCH transmission on subframe 
for a different serving cell in another TAG of CG1, the UE shall adjust its total transmission power of CG1 to not exceed 
on any overlapped portion.
– if the UE is configured with multiple TAGs within CG1, and if the PUSCH transmission of the UE on subframe 
for a given serving cell in a TAG of CG1 overlaps some portion of the first symbol of the PUCCH transmission on subframe 
for a different serving cell in another TAG of CG1 the UE shall adjust its total transmission power of CG1 to not exceed 
on any overlapped portion.
– if the UE is configured with multiple TAGs within CG1, and if the SRS transmission of the UE in a symbol on subframe 
for a given serving cell in a TAG of CG1 overlaps with the PUCCH/PUSCH transmission on subframe 
or subframe 
for a different serving cell in the same or another TAG of CG1 the UE shall drop SRS if its total transmission power of CG exceeds 
on any overlapped portion of the symbol.
– if the UE is configured with multiple TAGs within CG1 and more than 2 serving cells within CG1, and if the SRS transmission of the UE in a symbol on subframe 
for a given serving cell in the CG1 overlaps with the SRS transmission on subframe 
for a different serving cell(s) in CG1 and with PUSCH/PUCCH transmission on subframe 
or subframe 
for another serving cell(s) in CG1, the UE shall drop the SRS transmissions in CG1 if the total transmission power of CG1 exceeds 
on any overlapped portion of the symbol.
– if the UE is configured with multiple TAGs within CG1, the UE shall, when requested by higher layers, to transmit PRACH in a secondary serving cell in CG1 in parallel with SRS transmission in a symbol on a subframe of a different serving cell belonging to a different TAG of CG1, drop SRS in CG1 if the total transmission power of CG1 exceeds 
on any overlapped portion in the symbol.
– if the UE is configured with multiple TAGs within CG1, the UE shall, when requested by higher layers, to transmit PRACH in a secondary serving cell in CG1 in parallel with PUSCH/PUCCH in a different serving cell belonging to a different TAG in CG1, adjust the transmission power of PUSCH/PUCCH in CG1 so that its total transmission power of CG1 does not exceed 
on the overlapped portion.
Table 5.1.4.2-1: 
(or 
) values for determining power allocation for dual connectivity
|
p-MeNB |
|
|
0 |
0 |
|
1 |
5 |
|
2 |
10 |
|
3 |
15 |
|
4 |
20 |
|
5 |
30 |
|
6 |
37 |
|
7 |
44 |
|
8 |
50 |
|
9 |
56 |
|
10 |
63 |
|
11 |
70 |
|
12 |
80 |
|
13 |
90 |
|
14 |
95 |
|
15 |
100 |
(or 
) Value (in %)