R1-2600093
discussion
Beam Management for Multi-TRP transmission in 6GR
From Kyocera Corporation
Summary
Kyocera presents 5 proposals for AI-based beam management for multi-TRP transmission in 6G, arguing that Rel-18/19 AI/ML frameworks should be reused and extended to Distributed MIMO scenarios with more than 2 TRPs, while studying beam prediction in both spatial and temporal domains to reduce overhead and improve reliability.
Position
Kyocera proposes reusing the Rel-18/19 inter-cell AI/ML beam management framework for Distributed MIMO (D-MIMO) scenarios with multi-TRP transmission. They propose using 5G NR 2-TRP operation as a baseline reference and studying m-TRP operation with more than 2 TRPs, documenting throughput gains versus complexity increase. They propose studying spatial domain beam prediction to reduce the number of searches and processing time across multiple TRP beam candidates, specifically reusing the Set A / Set B mechanism from Rel-18/19 for efficient TRP selection based on UE measurement reports. They propose extending temporal-domain beam prediction to D-MIMO to improve beam tracking and enable seamless TRP switching for mobile UEs. They propose studying beam management for multiple TRP deployments that considers multiple UEs connecting to multiple TRPs simultaneously, and specifically studying efficiency improvements for CSI-RS reporting in D-MIMO, noting that current L1-RSRP reporting limits of N = 6 or 8 may provide insufficient prediction accuracy for joint transmission scheduling with multiple TRPs and UEs.
Key proposals
- Proposal 1a (Sec Number of TRPs to coordinate): Use 5G NR with 2-TRP operation as a baseline reference for 6GR
- Proposal 1b (Sec Number of TRPs to coordinate): Study m-TRP operation with more than 2 TRPs documenting throughput gains vs complexity increase with respect to the baseline reference
- Proposal 2 (Sec Spatial Domain Beam prediction for efficiency of beam search): Efficiency of Multi-TRP Beam Search by Beam Prediction in Spatial Domain should be studied.
- Proposal 3 (Sec Temporal Domain Beam prediction for improved reliability): Extend temporal-domain beam prediction to D-MIMO for improved connectivity
- Proposal 4 (Sec Option#1/Option#2/Beam management for multiple TRP deployments): Beam management for multiple TRP deployments should be studied
- Proposal 5 (Sec Option#1/Option#2/Beam management for multiple TRP deployments): Efficiency of CSI-RS Reporting in D-MIMO by Spatial Domain Beam Prediction should be studied