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The document provides a comprehensive summary of agreements,
discussions, and conclusions related to Rel-19 NR MIMO Phase 5 enhancements.
Below is a categorized summary of the agreements by topic:
1. Enhancements for UE-Initiated/Event-Driven Beam
Management
- Triggering Events:
- Event-2 instances are counted per new beam, and counting
resets when the indicated TCI state is updated.
- Event-7 supports additional configurations for
determining the Q-th best quality beam.
- Measurement windows for initiating beam reporting are
defined with options for configuration and timer-based approaches.
- Beam Report Transmission:
- First PUCCH channel configuration uses a new UCI type
with periodic resources.
- Multiplexing/dropping rules for 1-bit first PUCCH are
prioritized over other PUCCH or PUSCH transmissions.
- Single UEI beam reports are carried in the second PUSCH,
with additional indications for CSI report configurations.
- Cross-CC Beam Reporting:
- First PUCCH and second PUSCH can be from different PUCCH
groups, subject to UE capability signaling.
- Introduced RRC parameters to indicate ServCellIndex for
cross-CC beam measurement.
2. CSI Enhancements
- Support for 128 CSI-RS Ports:
- Legacy CSI sub-band definitions are reused for sub-band
reporting.
- Resource-level slot offsets for aperiodic CSI-RS resource
sets are supported with values {0, 1, 2, 3, 4, 5, 6, 7}.
- For periodic/semi-persistent CSI reporting, nCSI_ref is
scaled for P=128 with Capability 2 timeline.
- CRI-Based CSI Refinement:
- Resource-specific RI restrictions are supported, with
zero-padding bits introduced for RI fields.
- Multiplexing rules for CSI part-1 and part-2 are defined
based on rank values and payload sizes.
- Type-I and Type-II Codebook Refinements:
- Supported (Ng, N1, N2) values for multi-panel codebook
refinement are defined for 48, 64, and 128 CSI-RS ports.
- PowerOffset parameters are configurable for
subConfiguration IEs in Rel-18 SD NES Type-I.
3. Support for 3-Antenna-Port Codebook-Based
Transmissions
- SRS Configuration:
- Separate UE capabilities introduced for 3T3R and 3T6R
antenna switching.
- SRS resource sets can be configured with periodic,
semi-persistent, or aperiodic resource types.
- PTRS-DMRS Association:
- PTRS-DMRS association rules are defined for 1 and 2 PTRS
ports, with specific bit indications for DMRS ports.
- Power Scaling:
- Scaling rules for PUSCH transmission power are defined
based on the number of antenna ports with non-zero transmission power.
4. Enhancements for Asymmetric DL sTRP/UL mTRP Scenarios
- Two-Timing Advance (2TA):
- One downlink reference timing is supported for scenarios
with PL offset in joint/UL TCI states.
- Two downlink reference timings are supported for
scenarios without PL offset, with Rx timing differences limited to one CP
length.
- PRACH Transmission:
- PRACH association indicator in DCI format 1_0 is reused
to determine PL RS for PDCCH-order PRACH transmission.
- Closed-Loop Power Control (CLPC):
- CLPC reset mechanisms are proposed based on TAG IDs or
DCI field indications.
5. General Agreements
- Specification Updates:
- Changes to TS38.211, TS38.214, and TS38.213 are proposed
for precoding, SRS configuration, and power control mechanisms.
- Legacy principles are reused for many features, with
enhancements introduced where necessary.
- UE Capabilities:
- Separate UE capabilities are introduced for features like
overlapping UL transmission reduction, antenna switching, and sub-band
reporting.
This summary captures the key agreements and discussions
across the topics covered in the document.