R1-2600044
discussion
On other physical layer signals, channels and procedures in 6GR
From Nokia
Summary
This document from Nokia presents 12 proposals and 2 observations across three main technical areas in 6G Radio: Cross-link interference (CLI) handling, Remote Interference Management (RIM), and Cell DTX/DRX for energy efficiency. The proposals aim to establish frameworks for measuring and reporting both UE-to-UE and gNB-to-gNB CLI, simplify RIM design based on 5G NR commercial deployment lessons, and study Cell DTX/DRX with joint optimization of energy-saving features.
Position
Nokia proposes prioritizing layer-1 over layer-3 UE-to-UE CLI measurements for 6GR due to higher configuration flexibility and faster interference tracking. They require re-using SRS-RSRP and CLI-RSSI as baseline reporting quantities while studying event-triggered reporting to reduce UE complexity and energy consumption. For RIM, Nokia prefers simplifying the 5G NR RIM design by prioritizing RIM Framework-1, down-prioritizing backhaul-signaling solutions due to one-to-many aggressor-victim cell relationships, and reducing RIM RS configurability parameters (sequence numbers, bandwidth options like 48 vs 96 PRBs) to improve inter-operability. For Cell DTX/DRX, they propose studying joint optimization with spatial/power domain adaptation and relaxation of cell-common signals/channels during non-active periods.
Key proposals
- Proposal 2.1 (Sec 2): 6GR to introduce measurement and reporting mechanisms for UEs to inform the network about the UE-to-UE CLI conditions.
- Proposal 2.2 (Sec 2): Support layer-1 UE-to-UE CLI measurements and reporting in 6GR, whereas the layer-3 measurements can be de-prioritized.
- Proposal 2.3 (Sec 2): 6GR to use SRS-RSRP and CLI-RSSI as baseline reporting quantities for UE-to-UE CLI, study the option to extend RSSI measurement framework to general interference measurement.
- Proposal 2.4 (Sec 2): 6GR to study the enhancement of CLI measurement and reporting to reduce UE complexity and energy consumption.
- Proposal 2.5 (Sec 2): 6GR to study the additional schemes for UE-to-UE CLI handling (e.g. power control-based scheme).
- Proposal 2.6 (Sec 2): 6GR to introduce measurement and reporting mechanisms for gNBs to identify the source of gNB-to-gNB CLI.
- Proposal 2.7 (Sec 2): 6GR to study new procedures for gNB-to-gNB CLI mitigation.
- Proposal 3.1 (Sec 3): 6GR to support reference signals and detection and mitigation techniques for remote interference (RIM).
- Proposal 3.2 (Sec 3): For MRSS compatibility purposes, the 6GR RIM solution is based on the 5G RIM design as a starting point. Discuss options for simplifications based on lessons learned from 5G NR commercial deployments with the goal of improving inter-operability across network vendors and operators.
- Proposal 3.3 (Sec 3): For the 6G RIM design, consider RIM Framework-1 as highest priority. Down-prioritize solutions requiring backhaul signaling due to high overhead. Reduce the level of 'configurability' of the RIM RS relative to the 5G NR design.
- Proposal 4.1 (Sec 4): The 6G SI to study the support of Cell DTX/DRX from RAN1 perspective including linked adaptation of other ES schemes, spatial/power domain adaptation, relaxation of cell-common signal/channel transmission (PRACH, SS/PBCH, SIB), and UE measurement.