R1-2600121
discussion
Discussion on other aspects of CSI acquisition and report for 6GR
From Spreadtrum
Summary
This document from Spreadtrum/UNISOC discusses design aspects for 6G Radio (6GR) Phase Tracking Reference Signal (PT-RS) and Tracking Reference Signal (TRS). It contains 4 proposals total, recommending a dedicated PT-RS design reusing 5G NR as a baseline and advocating for the reuse of CSI-RS design with dedicated configuration for TRS, along with studying whether NR tracking requirements suffice for 6GR.
Position
Spreadtrum proposes a dedicated PT-RS design for 6GR phase noise estimation, arguing that existing reference signals like CSI-RS and DMRS are insufficient—CSI-RS is independent from PDSCH and DMRS lacks sufficient time domain density. They consider NR PT-RS design mature and propose reusing it as a baseline for 6GR, remaining open to discussing enhancements. For TRS, they propose reusing CSI-RS design with dedicated configuration to construct RE patterns for fine time/frequency tracking, noting benefits for a unified channel measurement framework. They additionally propose studying whether NR time/frequency tracking requirements are sufficient before discussing any enhancements beyond NR TRS design.
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.