3GPP TSG RAN WG1 #120bis																R1-2501744
Wuhan, China, April 7th – 11th, 2025

Agenda Item:		9.2.3
Source:				InterDigital, Inc.
Title:						On Specifications of Rel-19 CB-based UL for 3TX UE
Document for:		Discussion and Decision

Conclusions
In this contribution, we discussed our views with respect to the Rel-19 CRs for specifying 3TX. We make the following observation and proposal:

Proposal 1: Adopt the following changes in the CR for 38.214, 

3GPP TSG RAN WG1 #120b			        R1-2501746
Wuhan, China, April 7th – 11th, 2025
Agenda Item:		9.2.3
Source:				Moderator (InterDigital, Inc.)
Title:						FL Summary Support for 3TX CB-based Uplink; First Round
Document for:		Discussion and Decision

Conclusion
For a 3TX UE, following agreements for codebook-based transmission can also be extended for non-codebook-based transmission,

Agreement
For 3T3R and 3T6R antenna switching, support the following separate UE capabilities for SRS configuration,
“srs-AntennaSwitching3T6R2SP-1Periodic” to extend srs-AntennaSwitching2SP-1Periodic to the case of 3T6R.
“srs-AntennaSwitching3T3R2SP-1Periodic” to extend srs-AntennaSwitching2SP-1Periodic to the case of 3T3R.

TDoc file unavailable

3GPP TSG RAN WG1 #120b			        R1-2501748
Wuhan, China, April 7th – 11th, 2025
Agenda Item:		9.2.3
Source:				Moderator (InterDigital, Inc.)
Title:						Summary of Discussion on 3TX CB-based Uplink in RAN1#120bis
Document for:		Discussion and Decision

Conclusion
For a 3TX UE, following agreements for codebook-based transmission can also be extended for non-codebook-based transmission,

Agreement
For 3T3R and 3T6R antenna switching, support the following separate UE capabilities for SRS configuration,
“srs-AntennaSwitching3T6R2SP-1Periodic” to extend srs-AntennaSwitching2SP-1Periodic to the case of 3T6R.
“srs-AntennaSwitching3T3R2SP-1Periodic” to extend srs-AntennaSwitching2SP-1Periodic to the case of 3T3R.

RAN1 #120-bis
Agreement
Adopt the following changes in Clause 6.3.1.5 in TS38.211. 

Agreement
Adopt the following changes in Clause 6.2.1.2 in TS38.214.

Agreement
Adopt the following changes in Clause 6.2.1 in TS38.214. 

Agreement
Adopt the following changes in Clause 7.1 in TS38.213. 

Agreement
For a 3TX UE, when configured to ‘nonCodebook’, to distinguish UE behavior for PTRS-DMRS association between the Rel-19 and Rel-18 behavior,
Do not introduce a new RRC parameter, but enhance the definition of the RRC parameter 4portSRS_3Tx, for example, 
‘1-bit RRC parameter to indicate that port 1003 is disabled for all the 4-port resources in an SRS resource set with usage ‘codebook’ or ‘antennaSwitching’, or to indicate 3-port transmission is enabled for a configured SRS resource set with usage ‘nonCodebook’.

3GPP TSG RAN WG1 Meeting #120bis	R1-2501782
Wuhan, China, April 7th – 11th, 2025

Source: 	ZTE Corporation, Sanechips
Title:	Discussion on 3-antenna-port codebook-based transmissions
Agenda item:	9.2.3
Document for:	Discussion and Decision

Conclusion
In this contribution, we provide our views on the 3Tx UL transmission, and we have the following proposals. 
Proposal 1: A maximum of 3 SRS resources per set should be supported for NCB 3Tx transmission.
Further details should be discussed in the UE feature session. 
Text Proposal 1: The following text change should be adopted in clauses 6.3.1.5 in TS 38.211.
Text Proposal 2: The following text change should be adopted in clauses 7.3.1 in TS 38.212.
Text Proposal 3: The following text change should be adopted in clauses 6.2.1 in TS 38.214.

3GPP TSG RAN WG1 #120bis	                   	    R1-2501801
Wuhan, China, April 7th – 11th, 2025

Source: 	vivo
Title:	Discussion on 3-antenna-port UL codebook-based uplink transmission
Agenda Item:	9.2.3
Document for:	Discussion and Decision

Conclusion
As a summary, we have the observation below.
Observation 1:
The newly added RRC parameter for 3Tx operation is only applicable when SRS resource(s) are configured with 4 ports with usage as codebook or antenna switching.

We have the following TP proposals.
TP 1:
Adopt the following TP in red text to clarify the [RRC_parameter] is only applicable when SRS resource(s) are configured with 4 ports Section 6.2.1.

TP 2:
Adopt the following TP in red text for TS 38.211 Section 6.3.1.5.

R1- 2501852
3GPP TSG RAN WG1 Meeting #120bis
Wuhan, April 07-11, 2025

Conclusions
The document discussed enhancememnts targeting codebook transmission to enable up to 3 Tx UL operation. Based on the observations, the proposals are presented as below.
Proposal 1: SRS ports and PUSCH ports are different atleast for 3Tx as there are only 3 physical antenna ports that are available for PUSCH and SRS resource of 4ports is used for 3Tx UE. So, we prefer not to use port 1003 in the PUSCH transmission paragraphs and propose below correction (in 38.211 section 6.3.1.5).


-	for transmissions using 3 antenna ports when 4portSRS_3TX is configured, the UE does not transmit on antenna port 1003 and  is given by Tables 6.5.1.5-48 to 6.3.1.5-50; 

Can be reframed as


-	for transmissions using 3 antenna ports when 4portSRS_3TX is configured, UE performs transmission on the antenna ports 1000, 1001, 1002 using the precoder  that is given by Tables 6.5.1.5-48 to 6.3.1.5-50; 
   

3GPP TSG-RAN WG1 Meeting #120-bis	R1- 2501941
Wuhan, China, April 7th – 11th, 2025
Agenda Item:	9.2.3
Source:	Ericsson 
Title:		Remaining issues for 3 Tx UL transmissions
Document for:	Discussion

Conclusion
In this contribution, we addressed the remaining details for the 3 Tx UL MIMO portion of the Rel-19 MIMO work item, and as well as potential future work. Specifically, we focused on finalizing the PTRS-DMRS association indication for non-codebook based transmission with two PTRS ports, defining the power split between PUSCH ports for 3 Tx transmission and clarifying UE behavior for SRS transmission in 3 Tx operation. Additionally, given the interest expressed in recent plenaries and the anticipation of new work items, we provided background for potential future UL MIMO enhancements.
This led to the following proposals for RAN1#120-bis on 3 Tx:
Proposal 1	Conclude that the agreed PTRS-DMRS association indication for non-codebook based PUSCH with two PTRS ports, applicable when up to three SRS resources are configured in an SRS resource set, shall also apply to the case where up to four SRS resources are configured in an SRS resource set, if the configuration of up to four SRS resources in an SRS resource set is agreed.
Proposal 2	Confirm the enhancement in the draft CR for TS 38.213 to enable scaling down of PUSCH power by a factor of 3 when [4portSRS_3Tx] is enabled.
Proposal 3	Confirm the following enhancement in Section 6.2.1 of TS 38.214 to clarify the UE behavior when [RRCparameter] is configured to disable port 1003, where [RRCparameter] is only configured for SRS resource set with usage ‘codebook’ and ‘antenna switching’:
The UE does not transmit SRS on antenna port 1003 if [RRCparameter] is configured in SRS resource set(s) with higher layer parameter usage set to ‘codebook’ or ‘antennaSwitching’.
Proposal 4	Include the following enhancement in Section 6.1.1.1 of TS 38.214 to clarify that the precoder is selected from the uplink codebook with the number of antenna ports equal to 3 when [RRCparameter] is configured:
The transmission precoder is selected from the uplink codebook that has a number of antenna ports equal to higher layer parameter nrofSRS-Ports or nrofSRS-Ports-n8 in SRS-Config, if [RRCparameter] is not configured, or 3 if [RRCparameter] is configured, as defined in Clause 6.3.1.5 of [4, TS 38.211].
	
Some observations and proposals regarding potential work related to other UL enhancements can be found in Section 2.4.

3GPP TSG RAN WG1 #120bis		R1-2501951
Wuhan, China, April 7th – 11th, 2025

Agenda Item:	9.2.3
Source:	Google
Title:	Uplink 3 Ports Codebook based Transmission
Document for:	Discussion/Decision

Conclusion
In this contribution, we provided discussion on uplink 3 ports codebook-based transmission for NR MIMO. Based on the discussion, the following proposals are provided.
Proposal 1: Support Table 1 for PTRS-DMRS association indication when 2-port PT-RS are configured and 4 SRS resources for non-codebook are configured.
Table 1: PTRS-DMRS association indication when 2-port PT-RS are configured and 4 SRS resources for non-codebook are configured

3GPP TSG RAN WG1 #120bis                                                                            R1-2501987
Wuhan, China, April, 7th – 11th, 2025

Source:	CATT
Title:	Remaining issues on 3-antenna-port uplink transmission
Agenda Item:	9.2.3
Document for:	Discussion and Decision

Conclusions
In this contribution, we provided our views on remaining issues for 3Tx enhancements. A summary for the observation and proposals is provided as follows:
Proposal 1: Support to use a 8-bit bitmap for the indication of supported SRS antenna switching pattern in the downgrade mode for 3T6R SRS antenna switching including the following patterns: {1T1R, 1T2R, 1T4R, 1T6R, 2T2R, 2T4R, 2T6R, 3T3R}.
Proposal 2: Do not change the linear SRS power split scheme for 3-port SRS transmission.

3GPP TSG RAN WG1 #120bis		                                         R1-2502109
Wuhan, China, April 7th – 11th, 2025

Agenda Item:	9.2.3
Source:	Lenovo
Title:	Support for 3-antenna-port codebook-based transmissions
Document for:	Discussion

Conclusion
As a summary, we have the following proposals on support for 3-antenna-port codebook-based transmissions:
Proposal 1: Support Rel-18 STxMP schemes for PUSCH transmission for a 3Tx UE.
Proposal 2:For the tables that indicate the second Precoding information for 3Tx PUSCH transmission:
Support same tables for SFN scheme as TDM scheme;
Support Table 1 and Table 2 for SDM scheme.
Proposal 3: For a 3Tx UE, the transmission precoder is selected from the uplink codebook that has a number of antenna ports equals to 3 other than nrofSRS-Ports.
Proposal 4: Reuse legacy guard period design principle and legacy guard period value for 3T6R antenna switching.
Proposal 5: Support ‘t3r3’ as one downgrading antenna switching configuration value for UE equipped with 4Rx/6Rx/8Rx and indicating capability supportedSRS-TxPortSwitch/srs-AntennaSwitching Beyond4RX-r17/srs-AntennaSwitching8T8R-r18, respectively. 

3GPP TSG RAN WG1 #120bis		                                               R1-2502155
Wuhan, China, April 7th – 11th, 2025
Agenda item:	9.2.3
Title:	Discussion on Support for 3-antenna-port codebook-based transmissions
Source:	CMCC
Document for:	Discussion and Decision

Conclusion 
This contribution provides our views on support for 3-antenna-port codebook-based transmissions. Based on the above discussions, the proposals are as follows:
Proposal 1: Support the reporting of ‘3T3R’ as a downgrading UE capability for 4R, 6R, or 8R UE.

3GPP TSG-RAN WG1 Meeting #120bis	R1-2502226
Wuhan, China, April 7-11 2025   

Agenda Item:	9.2.3
Source:	Huawei, HiSilicon
Title:	Discussion on 3-antenna-port UL transmission
Document for:	Discussion and Decision

Conclusion
In this contribution, we have discussed some pending issues regarding to the Rel-19 MIMO 3Tx draft CRs, and made the following proposals: 
Proposal 1: Update the TS 38.211 draft CR as below:
Proposal 2: Support to introduce a component for FG 59-3-2 to indicate the supported maximum number of SRS ports, the candidate value of which is up to 3. 
Proposal 3: Update the TS 38.213 draft CR as below:

3GPP TSG RAN WG1 #120bis	              	     R1-2502295
Wuhan, China, April 7th – 11th, 2025

Source:	OPPO
Title:	Discussion on 3-antenna-port uplink transmissions
Agenda Item:	9.2.3
Document for:	Discussion and Decision

Conclusions
In this contribution, we provide two text proposals for 3-antenna-port uplink transmissions as following.
Proposal 1: Apply the text proposal 1 to the endorsed 38.211 draft CR.
Proposal 2: Apply the text proposal 2 to the endorsed 38.214 draft CR.

3GPP TSG RAN WG1 #120bis                                         R1-2502359
Wuhan, China, April 7th – 11th, 2025 

Agenda item:	9.2.3
Source: 	Samsung
Title: 	Views on Rel-19 3-antenna-port codebook-based transmissions
Document for:	Discussion and Decision

Conclusion
In this contribution, the following observation and proposals are given: 

Proposal 1. Support to report a bitmap based downgrading indication for 3T6R SRS antenna switching among {1T1R, 1T2R, 1T4R, 1T6R, 2T2R, 2T4R, 2T6R, 3T3R, 3T6R} and 3T3R SRS antenna switching among {1T1R, 1T2R, 2T2R, 3T3R}.

Proposal 2. Adopt the following text proposal expressed by yellow highlight in Clause 6.3.1.5 in TS38.211.

Proposal 3. Adopt the following text proposal expressed by yellow highlight in Clause 6.2.1.2 in TS38.214.

Proposal 4. Move the following sentence in Clause 6.1.1.1 in TS38.214 and delete square bracket expressed by yellow highlight.

3GPP TSG RAN WG1 #120bis	                                                R1-2502436
Wuhan, China, April 7th – 11th, 2025

Agenda Item:	9.2.3
Source:	Xiaomi
Title:	Discussion on the support of 3-antenna-port CB based transmissions
Document for:	Discussion and Decision

Conclusion
In this contribution, we provide several TPs based on the endorsed CRs as above.
Proposal 1: Endorse the following TP of a typo in TS 38.211:
==================Text proposal for 38.211 Section 6.3.1.5===========================
6.3.1.5	Precoding
The block of vectors  shall be precoded according to

where , . The set of antenna ports  shall be determined according to the procedure in [6, TS 38.214]. 
For non-codebook-based transmission, the precoding matrix  equals the identity matrix.
For codebook-based transmission, the precoding matrix  depends on the number of antenna ports used for the transmission: 
-	for single-layer transmission on a single antenna port, ;
-	for transmissions using 2, or 4 antenna ports,  is given by Tables 6.3.1.5-1 to 6.3.1.5-7; 
-	for transmissions using 3 antenna ports when 4portSRS_3TX is configured, the UE does not transmit on antenna port 1003 and  is given by Tables 6..1.5-48 to 6.3.1.5-50; 
-	for transmissions using 8 antenna ports,  is given by


-------Unchanged part omitted--------
===========================================================================

Proposal 2: Endorse the following TP on the description of Second PTRS-DMRS association indication field in TS 38.212:
==================Text proposal for 38.212 Section 7.3.1.1.2===========================
-------Unchanged part omitted--------
-	Second PTRS-DMRS association
-	2 bits when one PTRS port or two PTRS ports are configured by maxNrofPorts in PTRS-UplinkConfig for 4 or 8 antenna ports, PTRS-DMRS association field is present, SRS resource set indicator field is present and equals "10" or "11", maxRank>2 or maxMIMO-Layers>2, and neither multipanelSchemeSDM nor multipanelSchemeSFN is configured;
-	2 bits when one PTRS port is configured by maxNrofPorts in PTRS-UplinkConfig for 3 antenna ports, PTRS-DMRS association field is present, SRS resource set indicator field is present and equals "10" or "11", maxRank=3 or maxMIMO-Layers=3, and neither multipanelSchemeSDM nor multipanelSchemeSFN is configured;
-	1 bit when two PTRS ports are configured by maxNrofPorts in PTRS-UplinkConfig for 3 antenna ports, PTRS-DMRS association field is present, SRS resource set indicator field is present and equals "10" or "11", maxRank<=3 or maxMIMO-Layers<=3, and neither multipanelSchemeSDM nor multipanelSchemeSFN is configured;
-	0 bit otherwise.
one PT-RS port  two PT-RS ports are configured by maxNrofPorts in PTRS-UplinkConfig respectively, and the DMRS ports are indicated by the Antenna ports field.

-------Unchanged part omitted--------
===========================================================================

==================Text proposal for 38.212 Section 7.3.1.1.3===========================
-------Unchanged part omitted--------
-	Second PTRS-DMRS association
-	2 bits when one PTRS port or two PTRS ports are configured by maxNrofPorts in PTRS-UplinkConfig for 4 or 8 antenna ports, PTRS-DMRS association field is present, SRS resource set indicator field is present and equals "10" or "11", maxRank>2 or maxMIMO-Layers>2, and neither multipanelSchemeSDM nor multipanelSchemeSFN is configured;
-	2 bits when one PTRS port is configured by maxNrofPorts in PTRS-UplinkConfig for 3 antenna ports, PTRS-DMRS association field is present, SRS resource set indicator field is present and equals "10" or "11", maxRank=3 or maxMIMO-Layers=3, and neither multipanelSchemeSDM nor multipanelSchemeSFN is configured;
-	1 bit when two PTRS ports are configured by maxNrofPorts in PTRS-UplinkConfig for 3 antenna ports, PTRS-DMRS association field is present, SRS resource set indicator field is present and equals "10" or "11", maxRank<=3 or maxMIMO-Layers<=3, and neither multipanelSchemeSDM nor multipanelSchemeSFN is configured;
-	0 bit otherwise.
one PT-RS port  two PT-RS ports are configured by maxNrofPorts in PTRS-UplinkConfig respectively, and the DMRS ports are indicated by the Antenna ports field.

-------Unchanged part omitted--------
===========================================================================

Proposal 3: Endorse the following TP in TS 38.214:
==================Text proposal for 38.214 Section 6.1.1.1===========================
-------Unchanged part omitted--------
For codebook based transmission with three antenna ports, the UE determines its codebook subsets based on TPMI(s) and upon the reception of higher layer parameter codebookSubset in pusch-Config for PUSCH associated with DCI format 0_1 or 0_3 and codebookSubsetDCI-0-2in pusch-Config for PUSCH associated with DCI format 0_2 which configured with 'nonCoherent'.

-------Unchanged part omitted--------
===========================================================================

 

3GPP TSG RAN WG1 Meeting #120bis		R1-2402526
Wuhan, China, April 7th – 11st, 2025

Agenda item:       9.2.3
Source: 	Nokia
Title: 	On the support for 3-antenna-port codebook based transmissions
Document for:     Discussion and Decision

1	

Conclusions
In our contribution, related uplink 3Tx topics are discussed. Here is the list of our proposals:
Proposal 1: 	A UE may be configured with only one of the following configurations depending on the indicated UE capability supportedSRS-TxPortSwitchBeyond4Rx:
't1r1' for 1T1R, 
't2r2' for 2T2R, 
't1r2' for 1T2R, 
't4r4' for 4T4R, 
't2r4' for 2T4R, 
't1r4' for 1T4R, 
't2r6' for 2T6R, 
't1r6' for 1T6R, 
't4r8' for 4T8R, 
't2r8' for 2T8R, 
't1r8' for 1T8R
‘t3r3’ for 3T3R,
't3r6' for 3T6R,

3GPP TSG RAN WG1 #120bis                                                                R1- 2502600	
Wuhan, China, April 7th – 11th, 2025

Agenda Item:	9.2.3
Source:	Apple Inc.
Title:	Remaining issues on R19 MIMO 3Tx transmission
Document for:	Discussion/Decision

Conclusion
In this contribution, we shared our views on remaining issues regarding R19 MIMO 3Tx UL transmission. The following proposals are made:
Proposal 1: Adopt current bitmap-based procedure for UE reporting supported downgrading SRS antenna switching configurations for 3T3R and 3T6R 
For 3T3R, a bitmap indicates downgrading among xTyR as {1T1R, 1T2R, 2T2R, 3T3R} 
For 3T6R, a bitmap indicates downgrading among xTyR as {1T1R, 1T2R, 1T4R, 1T6R, 2T2R, 2T4R, 2T6R, 3T3R, 3T6R}

3GPP TSG RAN WG1 #120bis	R1-2502667
Wuhan, China, April 7th – 11th, 2025
Source:	Sharp
Title:	Support for 3-antenna-port transmission
Agenda Item:	9.2.3
Document for:	Discussion and Decision

Conclusion
In this contribution, we have the following proposal:
Proposal 1: The following TP should be adopted in TS38.211:
Reason for change: Current specification in TS38.211 Section 6 for SRS resource does not reflect the agreement of port 1003 disabled.
Summary of change:  if 3Tx is configured.
Consequences if not approved: Port 1003 is not disabled, and an SRS sequence for port 1003 is generated.

3GPP TSG RAN WG1 #120bis			R1-2502761
Wuhan, China, April 7th – 11th, 2025

Source:	NTT DOCOMO, INC.
Title:	Discussion on support for 3-antenna-port codebook-based transmissions
Agenda Item:	9.2.3
Document for: 	Discussion and Decision

Conclusion
In this contribution, we discussed RRC parameter for non-codebook-based 3-antenna-port transmission is discussed. Based on the discission, following proposal is made. 
Proposal 1: 
 New RRC parameter is used for enabling non-codebook-based 3-antenna-port transmission. 
The RRC parameter can be per SRS resource set. 
If the new RRC parameter is enabled, UE applies Rel-19 behavior for PTRS-DMRS association for non-codebook-based 3-antenna-port transmission, otherwise if the new RRC parameter is not enabled, UE applies Rel-18 behavior for PTRS-DMRS association.