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Summary of Agreements by Topic

Multi-TRP Enhancements

1. Unified TCI Framework Extension:
• Support for multiple DL/UL TCI states, simultaneous multi-panel UL transmission, and power control for UL single DCI.
• RRC configuration can indicate whether the first, second, or both joint/DL TCI states are applied to PDSCH reception.
• For PDSCH-CJT, QCL assumptions include two alternatives: QCL with both joint TCI states or QCL with both joint TCI states except Doppler parameters for the second state.
• For PUSCH/PUCCH transmission, the first and second joint/UL TCI states are applied to antenna ports associated with respective SRS resource sets.
• TAG association for UL channels/signals is based on CORESET Pool Index, with TAG ID indicated via RRC configuration.
2. Two TAs for Multi-DCI:
• TAGs are associated with UL channels/signals based on TCI-state or CORESETPoolIndex.
• PRACH timing determination supported based on coresetPoolIndex and PRACH association indicator.
• Options for overlapping UL transmissions include introducing a time gap, reducing overlapping duration, or applying scheduling restrictions.

CSI Enhancements

1. Type-II Codebook Refinement for CJT mTRP:
• Supported combinations of parameters for Rel-16-based refinement, including amplitude restrictions and FD basis selection offsets.
• Linkage between parameter combinations supported via pairing.
2. Type-II Codebook Refinement for High/Medium Velocities:
• CQI associated with the first slot of the CSI reporting window and the first W2 matrix.
• Bitmap designs for indicating NZC locations under evaluation, with constraints defined jointly across DD basis vectors and layers.
3. TRS-Based TDCP Reporting:
• Quantized wideband normalized amplitude/phase of the time-domain correlation profile supported for aiding gNB determination of codebook switching and SRS periodicity.
• Multiplexing TDCP reporting with other UCI parameters on PUSCH supported.

Reference Signal Enhancements

1. Increased Number of Orthogonal DMRS Ports:
• Support for increased DMRS ports for UL/DL MU-MIMO and 8 Tx UL SU-MIMO.
• DMRS port combinations and CDM group configurations extended for Rel-18.
2. SRS Enhancements Targeting TDD CJT and 8 TX Operation:
• Mapping of 8-port SRS resources to comb offsets and cyclic shifts based on RRC configuration.
• Support for SRS comb offset hopping and cyclic shift hopping with reinitialization every N radio frames.

Enhanced Uplink Transmission

1. UL Precoding Indication for Multi-Panel Transmission:
• Dynamic switching between STxMP SDM/SFN and sTRP transmission supported via SRS resource set indicators in DCI.
• Maximal number of layers for overlapping PUSCH transmissions limited to 1 or 2.
2. SRI/TPMI Enhancements for Enabling 8 TX UL Transmission:
• Max number of MIMO layers extended to 8 via RRC configuration.
• Dual CW PUSCH operation supported with CBGTI field indicating transmission states of CBGs.
• Layer splitting for partially coherent uplink precoding defined for Ng=2 and Ng=4.

General Notes

• Agreements reflect significant progress in enhancing MIMO capabilities for Rel-18, including multi-TRP operations, CSI reporting, DMRS port enhancements, SRS interference randomization, and uplink transmission schemes.
• Several topics remain without consensus, such as enhanced power control for SRS and specific configurations for multi-DCI-based Multi-TRP operations. Further studies and refinements are ongoing.