R1-2600059
discussion
Other Aspects for CSI acquisition
From FUTUREWEI
Summary
Futurewei presents 5 proposals and 1 observation on 6G MIMO/RS/CSI framework design for the FS_6G_Radio study, arguing for an evolutionary approach building on 5G NR with targeted enhancements for upper midband, AI/ML integration, multi-port TRS, and early tracking acquisition.
Position
Futurewei proposes adopting the 5G NR MIMO/RS/CSI framework as a baseline for 6G, arguing it provides a complete set of essential functionalities without needing fundamental paradigm shifts. They propose studying multi-port TRS as a QCL source for DL transmissions using massive MIMO, where a UE applies a signaled or estimated precoding vector to received multi-port TRS to form an effective single-port TRS that matches the precoding of target DMRS/CSI-RS, reducing channel estimation degradation from precoding mismatch. They propose supporting early/on-demand tracking acquisition via aperiodic TRS (and optionally aperiodic SSB) as a mandatory feature for fast SCell/SCC activation and an optional feature for early CSI acquisition before CONNECTED. They propose integrating AI/ML into the MIMO framework from day-1 of 6G with discussion of high-level principles and identification of a few use cases. They propose studying UMB support including advanced Tx/Rx technologies, overhead reduction for CSI-RS/DMRS, and hybrid antenna architecture, and studying fast beam acquisition via augmented antenna architecture for one-shot beam acquisition.
Key proposals
- Proposal 1 (Sec 6G MIMO Framework Design): For 6G MIMO/RS/CSI: adopt 5G NR MIMO/RS/CSI framework as starting point, and study enhancements for UMB support, general performance (SE and UPT), and fast FR2 beam acquisition.
- Proposal 2 (Sec AI/ML): RAN1 to discuss high-level MIMO framework principles enabling integration of AI/ML-based functionality from day-1 of 6G, facilitating evaluation for AI/ML use cases.
- Proposal 3 (Sec AI/ML): Identify a few AI/ML use cases to facilitate the study and assessment of AI/ML-ready MIMO framework design.
- Proposal 4 (Sec TRS/tracking): Study introduction of multi-port TRS as QCL source for DL transmissions using massive MIMO antenna arrays, to reduce precoding mismatch between TRS and DMRS/CSI-RS, improving channel estimation performance.
- Proposal 5 (Sec Early/on-demand): Support early/on-demand tracking acquisition in 6G as a mandatory feature for fast SCell/SCC activation and as an optional feature for early CSI acquisition before CONNECTED.