R1-2600124
discussion
Discussion on other physical layer signals, channels and procedure for 6GR
From Spreadtrum
Summary
Spreadtrum UNISOC provides views on 6G Radio physical layer signals, channels, and procedures, covering scheduling request, power control, and interference measurement/handling. The document contains 8 formal proposals and 1 observation, with a focus on reusing NR mechanisms as baselines for 6G while proposing unified schemes for cross-link interference handling.
Position
Spreadtrum UNISOC proposes that 6GR physical uplink control signaling carry scheduling request combined with other UCI, and supports SR+BSR as the preferred mechanism over contention-based UL transmission, which they argue is not suitable for latency-sensitive data due to non-deterministic access latency affected by CBUL resource periodicity and UE sharing count. They propose Rel-17 NR UL PC framework (open-loop and closed-loop) as the baseline for 6GR power control, reusing beam-based transmissions, multiple numerologies, and DL RS for path loss measurement, with NR PHR as the baseline for 6GR PHR. For CLI handling, they observe overlapping functionalities between L1/L3 CLI measurement schemes in NR and propose a unified UE-to-UE CLI measurement and reporting scheme for SBFD operation. They propose using gNB-to-gNB co-channel CLI/channel measurements introduced in R19 as starting point with information exchange among gNBs and transparent/non-transparent UL resource muting. For NR-6GR MRSS, they propose resource allocation coordination to prevent conflicts, aligned numerology/waveform, and aligned UL/DL TDD direction to avoid cross-slot interference.
Key proposals
- Proposal 1 (Sec 2.1): 6GR physical uplink control signaling should carry scheduling request which can be combined with other uplink control information.
- Proposal 2 (Sec 2.1): SR + BSR mechanism for acquiring UL data resources should be supported in 6GR, and Contention-based UL transmission for acquiring UL data resources can be further studied.
- Proposal 3 (Sec 2.2): Rel-17 NR UL PC framework (including open-loop and close-loop power control) could be the baseline for 6GR UL PC, reusing beam-based transmissions, multiple numerologies, and DL RS for path loss measurement.
- Proposal 4 (Sec 2.2): NR PHR could be the baseline for 6GR PHR.
- Proposal 5 (Sec 2.3.1): For interference measurements and handling scheme(s) for SBFD/dynamic TDD, principles of gNB/UE implementation complexity, avoiding multiple schemes for the same scenario, feasibility/practicability, and applicable scenario/performance benefits should be considered.
- Observation 1 (Sec 2.3.2): Interference measurements and handling mechanisms introduced in NR have overlapping functionalities, e.g., L1/L3 CLI measurement.
- Proposal 6 (Sec 2.3.2): Consider unified UE-to-UE CLI measurement and reporting scheme for SBFD.
- Proposal 7 (Sec 2.3.3): Consider gNB-to-gNB co-channel CLI and/or channel measurements introduced in R19 as starting point, including information exchange among gNBs and transparent/non-transparent UL resource muting.
- Proposal 8 (Sec 2.3.4): For NR-6GR MRSS interference management, high-level aspects to consider are resource allocation coordination between NR-6GR to prevent conflicts, aligned numerology and waveform as NR in shared band, and aligned UL/DL direction in TDD operation.