R1-2600186
discussion
General aspects and frameworks for 6GR multi-antenna system
From OPPO
Summary
OPPO presents 46 proposals and 13 observations across 7 major sections addressing 6GR PHY design, advocating for a scalable modular air interface built on a lean mandatory baseline functionality set derived from low-tier IoT, while examining duplex types, spectrum utilization, coverage targets, MRSS, and harmonization of NTN/TN/sensing.
Position
OPPO proposes a modular 6GR air interface structured around a lean Mandatory baseline functionality set templated from lowest-tier 6G IoT, asserting that eMBB devices in low-data-rate mode are naturally IoT devices. They require intra-device-type scalability via device-type-specific mandatory/optional functionality sets and inter-device-type scalability via the baseline set. On duplex, OPPO presents technical case against UE-side SBFD due to 46dB antenna+RF isolation and 114dB total isolation requirements, limiting UE Tx power to below -5~-1dBm and coverage under 30m; they propose studying dynamic SBFD with unified design for dynamic TDD. For spectrum, OPPO argues SCMC framework requires lower complexity than CA framework across multiple dimensions (cell reselection, per-cell HARQ entity, BWP concept, PDCCH design). They propose extending FR1 to 8.4GHz with a separate mid-high band and 200MHz maximum UE channel bandwidth while studying NW-side 400MHz via 2-carrier combination. For sensing, OPPO requires reusing communication frame/slot structure without impacting symbol boundaries and proposes single/double-symbol methods for equivalent longer CP.
Key proposals
- Proposal 1 (Sec 2.3): The design principle for modular 6GR air interface uses a Mandatory baseline functionality set for all device types supporting low-data rate operation, with device-type-specific sets growing from it.
- Proposal 2 (Sec 2.4): Intra-device-type scalability is supported via device-type-specific mandatory/optional functionalities, while inter-device-type scalability is supported via the mandatory baseline functionality set.
- Proposal 9 (Sec 2.5): Identifies common functionalities applicable to all 6G device types: basic waveform/modulation/coding/frame structure/numerology, basic initial access for ~7GHz TN, DL/UL control for FDD/TDD single-carrier, eMBB coverage features, energy saving, and basic MRSS.
- Proposal 11 (Sec 3.2): Extend FR1 to 8.4 GHz and define a separate mid-high band (8.4–24.25 GHz) with 120kHz SCS as baseline.
- Proposal 13 (Sec 3.3): For 400MHz CBW at NW side, focus study on Option 2 and 3 (200MHz+200MHz 2-carrier operation at UE side with two FFT operations).
- Proposal 18 (Sec 4.1): For dynamic SBFD study, consider necessity/feasibility/commercial potentials/implementation complexity/performance plus unified design for dynamic TDD and dynamic SBFD.
- Proposal 19 (Sec 4.1): For UE-side SBFD, focus on feasibility analysis first with targets ensuring UE receiver front end is not saturated and sufficient DL SINR for data decoding; isolation requirements of 46dB (antenna+RF) and 114dB (all domains) are very challenging.
- Proposal 22 (Sec 4.2): For unified time-frequency configuration, study Option 1 (2D time-frequency resource configuration) and Option 2 (new SBFD symbol type).
- Proposal 28 (Sec 5.2): Coverage targets proposed: eMBB MCL=146dB/MIL=155dB/MPL=126dB; IoT MCL=153dB/MIL=162dB/MPL=133dB with data rates FFS.
- Proposal 35 (Sec 6): MRSS aspects include UE/NW complexity, resource allocation coordination, radio resource utilization, signaling overhead, FR1 operating bands, time/frequency alignment, reliance on existing NR deployments.
- Proposal 37 (Sec 7.2): Study multiple CCs sharing one common signaling set, TB across multiple carriers, HARQ entity sharing/cross-CC HARQ, flexible load balancing for RACH, RF/baseband sharing, and flexible UL/DL pairing.
- Proposal 38 (Sec 7.3): Study framework for multi-carrier handling including CA, SCMC, and carrier switching.
- Proposal 40 (Sec 7.5): 6GR NTN should consider both harmonized design with 6GR TN and NTN-specific features.
- Proposal 46 (Sec 7.6): For continuous waveform sensing, consider single-symbol method (comb-like frequency pattern for longer CP) and double-symbol method (first symbol forms longer CP) without changing symbol boundary.