3GPP TSG-RAN WG2 #130	R2-2504185
St Julian’s, Malta, May 19th – 23rd, 2025                     	
Agenda Item:	8.12.1
Source:	Ericsson
Title:	Open issues for MIMO on 38.331
Document for:	Information
1	

Conclusion
The open issues described in section 2 are for information to provide guidance on further discussions.

3GPP TSG-RAN WG2 Meeting #130	R2-2504210
St. Julian’s, Malta, May 19th – 23rd, 2025

Agenda item:	8.12.1
Source:	Samsung
Title:	Report of MAC open issues for MIMO
WID/SID:	NR_MIMO_Ph5
Document for:	Discussion and Decision

Conclusions
The following proposals have been provided based on feedback to the above document:
Proposals for easy agreement:
Proposal 1: (9/9) UL skipping is not applicable to mode-B type-1 CG event-triggered beam report. 
Proposal 2: (9/9) For Rel-16 UL skipping (enhancedSkipUplinkTxDynamic), the UCI for mode-A DG-based UE-initiated report follows the existing procedure (i.e., MAC PDU is generated), there is no MAC impact.
Proposal 4: (7/9) The existing rule is applied to handle the overlapping/prioritization between the PUSCH of mode-A UE-initiated report and SR/other PUSCH in MAC.

Issues for discussion:
Proposal 3: For Rel-15 UL skipping (skipUplinkTxDynamic is configured), discuss whether to generate MAC PDU for multiplexing UCI of mode-A DG-based UE-initiated report in PUSCH.
Proposal 5: discuss the scenario asymmetric DL sTRL/UL mTRP with no PL offset (i.e. the UL TRP may transmit SSB) based on RAN1/RAN4 LS (R1-2503091) and spec. impact regarding 2TA for sDCI mTRP.
Proposal 6: discuss to support sDCI mTRP 2TA for intra-DU LTM, in the same way as Rel-18 mDCI mTRP 2TA, i.e., the TA included in the LTM cell switch command is applied to the TAG configured for the indicated TCI state in LTM cell switch command.
Proposal 7: Regarding PL offset in LTM, discuss 
how to apply the PL offset in intra-DU LTM when PL offset is provided in LTM configuration (e.g., the PL offset for the indicated TCI state in the LTM cell switch command is applied for the first PUSCH transmission in RACH-less LTM cell switch); 
whether to support PL offset in intra-DU LTM when PL offset is not provided in LTM configuration for the target cell.

Proposal 8: Discuss whether/how Rel-18 TCI state activation MAC CEs for sDCI mTRP is applied for asymmetric DL sTRP/UL mTRP.
Proposal 9: Discuss UE behavior when UE-initiated report is triggered but there is no valid PUCCH/PUSCH resource to transmit UE-initiated report (e.g., PUCCH resource is released by RRC and type-1 CG is cleared in MAC due to TAT expired).
Proposal 10: Discuss whether the same rule of CSI report transmission is applied to UEI report (e.g., for activated/deactivated SCell/SCG, handling of measurement gaps, handling of FR2 UL gaps, BWP operation, cell DRX operation).