R1-2508683
discussion
Discussion on evaluation assumptions for 6GR air interface
From Xiaomi
Summary
This Xiaomi contribution proposes evaluation assumptions for 6GR air interface across general configurations, NTN, and ISAC, containing 9 total proposals. It prioritizes specific UE antenna configurations, Release-19 near-field channel modeling, multi-satellite NTN beam layouts, and focused ISAC evaluation scenarios.
Position
Xiaomi requires supporting Release-19 channel modeling including near-field and spatial non-stationarity for 6GR evaluations, particularly with larger-scale antenna arrays. For handheld UEs, they propose specific TX/RX antenna counts per frequency band (1T2R at sub-2GHz, 2T4R baseline/3T6R optional at 4GHz/7GHz) and argue against adopting new antenna layouts, instead preferring the legacy 5-element tuple model (M,N,P,Mg,Ng) to avoid vendor-implementation-specific performance divergences. For NTN multi-satellite evaluation, they define a detailed geocentric angle-based seven-satellite constellation (2-3-2 across 3 orbital planes) with beam layout reuse from TR 38.821 and specify 11GHz DL / 14GHz UL for Ku band. For ISAC, they prioritize four specific target/scenario combinations (UAV/UMa-AV, human/InH, vehicle/Urban grid, AGV/InF) and propose reusing 5GA sensing metrics (positioning/velocity accuracy, confidence level, false alarm/missed detection probability) while explicitly suggesting not to consider sensing serving latency and refreshing rate in RAN1 study.
Key proposals
- Proposal 1 (Sec 2.1): Support release 19 channel modelling including near-field and spatial non-stationarity in the evaluations involved in 6GR, esp. for the cases with larger-scale antenna arrays.
- Proposal 2 (Sec 2.2): For handheld UEs, consider 1T2R at 700MHz or 2GHz, and 2T4R (as baseline) or even 3T6R (as optional) at 4GHz or 7GHz.
- Proposal 3 (Sec 2.2): For IoT UEs, consider 1T1R at 700MHz or 2GHz, and 1T2R for 4GHz.
- Proposal 4 (Sec 2.2): Consider the legacy UE antenna model, represented by a 5-element tuple (M, N, P, Mg, Ng), in the evaluation of 6GR.
- Proposal 5 (Sec 3.1): The detailed frequency range is 11 GHz for DL, 14 GHz for UL for Ku band simulation.
- Proposal 6 (Sec 3.2): Adopt the evaluation assumptions in the attached table (Excel file) for 6GR NTN evaluation.
- Proposal 7 (Sec 3.3): Adopt the NTN Doppler and Delay characteristics in table 3.3-1 for 6GR NTN evaluation.
- Proposal 8 (Sec 4): To support the most important near future applications with a feasible evaluation effort, Rel-20 prioritizes evaluation assumptions for specific combinations of use case, sensing mode and deployment scenario (UAV/UMa-AV, human/InH, vehicle/Urban grid, AGV/InF).
- Proposal 9 (Sec 4): For evaluation sensing in 6G, the evaluations metrics for sensing evaluation in 5GA are used as a starting point.