R1-2601816
discussion
Discussion on other aspects of CSI acquisition and report for 6GR
From Spreadtrum
Spreadtrum's prior position on
10.5.3.3
at
RAN1#124
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Proposes a dedicated PT-RS design for 6GR phase noise estimation, arguing that existing reference signals like CSI-RS and DMRS are insufficient because CSI-RS is independent from PDSCH and DMRS lacks sufficient time domain density. Considers NR PT-RS design mature and proposes reusing it as a baseline for 6GR, remaining open to discussing enhancements. For TRS, proposes reusing CSI-RS design with dedicated configuration to construct RE patterns for fine time/frequency tracking, noting benefits for a unified channel measurement framework. Additionally proposes studying whether NR time/frequency tracking requirements are sufficient before discussing any enhancements beyond NR TRS design.
Summary
This document from Spreadtrum/UNISOC discusses design aspects for PT-RS and TRS in 6GR, making 4 proposals. The company advocates for a dedicated PT-RS design based on the mature 5G NR framework and proposes reusing CSI-RS with dedicated configuration for TRS, while recommending a study to assess whether existing NR time/frequency tracking requirements are sufficient for 6GR.
Position
Spreadtrum proposes introducing a dedicated PT-RS design specifically tailored for phase noise estimation, arguing that existing 6GR reference signals (CSI-RS, DMRS, SRS) are insufficient due to their distinct design principles. They propose reusing the 5G NR PT-RS sequence and RE pattern as a mature baseline, noting its stability from Rel-15 through Rel-20, while remaining open to discussing enhancements during the study phase. For TRS design, they propose reusing the CSI-RS design with dedicated configuration for fine time/frequency tracking, enabling a unified framework for channel measurements with configurable RE density in time and frequency domains. They require studying whether NR requirements for time/frequency tracking are sufficient before evaluating potential TRS enhancements, establishing this assessment as a prerequisite for determining the 6GR path forward.
Key proposals
- Proposal 1 (Sec 2.1): For phase noise estimation, support dedicated PT-RS design.
- Proposal 2 (Sec 2.1): For PT-RS design, consider to reuse PT-RS in 5G NR as baseline.
- Proposal 3 (Sec 2.2): For fine time/frequency tracking, consider to reuse CSI-RS design with dedicated configuration.
- Proposal 4 (Sec 2.2): Study whether NR requirements for time/frequency tracking is sufficient for RAN1 to continue future work for 6GR.