R1-2508993
discussion
Discussion on overview of 6GR air interface
From HONOR
Summary
This document from HONOR presents 21 proposals and 33 observations on the 6G Radio (6GR) air interface design, covering scalable device types, minimum spectrum allocation, coverage, MRSS with 5G, SSB structure, spectrum utilization, NTN integration, spectrum efficiency, initial access, and duplex types.
Position
HONOR proposes a three-tier device type classification (Type A for eMBB/XR, Type B for RedCap, Type C for IoT/LPWA) with common basic functions including SS/PBCH, RMSI, paging, RACH, DL/UL control channels, and FEC schemes, while opposing add-on features dedicated to specific device types. They require support for a minimum 3 MHz carrier bandwidth in the first 6G release to efficiently utilize fragmented refarming spectrum. For NTN, HONOR proposes GNSS-less operation for TN/NTN harmonization and a non-transparent beam hopping mechanism to prevent UE power wasting. They prefer supporting only gNB-side SBFD in Release 1 while maintaining forward compatibility for UE-side SBFD, citing severe self-interference challenges at the UE due to limited antenna isolation.
Key proposals
- Proposal 1 (Sec 2): The three device types (Type A: smartphone/CPE/XR; Type B: RedCap/wearable; Type C: IoT/LPWA) could be considered.
- Proposal 4 (Sec 3): Support minimum 3 MHz CBW in 6GR first release.
- Proposal 5 (Sec 4): Enhanced coverage should be supported in 6G first release.
- Proposal 6 (Sec 5): Alignment of the resource grid of 5G and 6G should be considered for MRSS from 5G to 6G.
- Proposal 9 (Sec 6): Both always-on SSB with larger periodicity and on-demand SSB with shorter periodicity are supported in 6G first release.
- Proposal 10 (Sec 7): At the UE side, support 200 MHz for FR1 and 400 MHz for FR2 maximum BW and 8192 maximum FFT size.
- Proposal 12 (Sec 8): Support GNSS-less operation for better harmonization of TN and NTN in 6GR.
- Proposal 13 (Sec 8): Support efficient beam hopping mechanism which is non-transparent to the UEs to avoid UE power wasting.
- Proposal 17 (Sec 9): Higher spectrum efficiency compared with 5G should be supported.
- Proposal 19 (Sec 10): Initial access and common channel should support fast/reliable connection establishment, be unified for different device types, and be adaptive for different cell types including NES, normal, and NTN cells.
- Proposal 20 (Sec 11): Design integrated frame structure and slot configuration signaling for FDD, TDD and SBFD.
- Proposal 21 (Sec 11): Support gNB-side SBFD while maintaining forward compatibility for potential UE-side SBFD in 6G first release.
- Proposal 3 (Sec 2): Introduction of add-on features dedicated to specific device types is not needed in 6G.
- Proposal 8 (Sec 6): Use 5G SSB structure as a starting point of SSB structure of 6G, taking the smallest carrier bandwidth (3/5 MHz) into account.
- Proposal 15 (Sec 8): An enhanced handover mechanism between TN cell and NTN cell should be supported in 6G first release.