Multi-TRP PUSCH Precoding Indication with Flexible SRI Mapping
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Solution Overview
Problem
Existing communication technologies face challenges in providing flexible precoding indications for codebook-based simultaneous transmission via multiple panels (STxMP) in multi-TRP systems, particularly under single downlink control signaling (S-DCI) scheduling, leading to insufficient flexibility and inefficient multi-panel transmission solutions.
Innovation Solution
The method involves enhancing precoding indication by using a single SRI indication field in S-DCI to schedule codebook-based PUSCH transmission from multiple panels to multiple TRPs, allowing for flexible spatial filter selection and association with different TRP/TCI/PUSCH transmission occasions, supporting various multiplexing modes like SDM, FDM, and SFN.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If codebook-based STxMP is supported with multiple SRS resources, then the terminal can perform simultaneous transmission via multiple panels, but the precoding indication flexibility is insufficient under S-DCI scheduling
Solution Approach 1:
The SRI indication field is segmented to provide separate indications for different SRS resource sets. Each SRI field can independently indicate spatial filters for different panels/TRPs, enabling flexible precoding control for multi-panel STxMP while maintaining manageable control signaling structure through organized resource set grouping
Solution Approach 2:
The patent introduces a new dimension in precoding indication by using multiple SRI fields within a single S-DCI, each field operating in a separate indication dimension for different SRS resource sets. This multi-dimensional indication approach enables comprehensive control of multi-panel transmissions without proportionally increasing overall control signaling complexity
2Adaptability or versatility
If multiple SRS resource sets are configured for different panels/TRPs, then multi-TRP transmission can be supported, but the number of required SRI fields increases control signaling overhead
Solution Approach 1:
Each SRI indication field is designed to be universal and can indicate spatial filters for any configured SRS resource set regardless of which specific panel or TRP it corresponds to. This universal indication mechanism allows the same field structure to serve multiple functions across different resource sets, reducing overall control signaling overhead while maintaining full multi-TRP transmission support
Solution Approach 2:
The patent dynamically adjusts the number and configuration of SRI fields based on the actual number of SRS resource sets configured for multi-TRP transmission. By making the SRI field configuration adaptable to the specific deployment scenario, the control signaling overhead is optimized to match the actual transmission requirements rather than being fixed at a high constant value
3Productivity
If a single S-DCI schedules multiple panels to multiple TRPs, then transmission efficiency is improved, but precise spatial filter indication for each panel becomes challenging
Solution Approach 1:
The SRI indication is segmented into multiple independent fields within the single S-DCI, with each field precisely indicating spatial filters for specific SRS resource sets associated with different panels. This segmentation maintains the transmission efficiency of single-DCI scheduling while achieving precise spatial filter indication for each panel through dedicated indication fields
Solution Approach 2:
The SRI indication fields act as intermediaries between the single S-DCI scheduler and the multiple panels/TRPs. Each SRI field translates the consolidated scheduling decision into precise spatial filter indications for its associated SRS resource set, enabling accurate panel-specific control while maintaining the efficiency benefits of unified S-DCI scheduling
Data Source
AI summary
A method for indicating precoding, performed by a network device, includes: sending single downlink control information (S-DCI), wherein the S-DCI is configured to schedule codebook-based physical uplink shared channel (PUSCH) transmission of a terminal from multiple panels to multiple transmission reception points (TRPs). A sounding reference signal resource indicator (SRI) indication field is carried in DCI scheduled by the S-DCI, and the SRI indication field indicates a sounding reference signal (SRS) resource combination configured for PUSCH transmission in an SRS resource set corresponding to a PUSCH, and indicates a respective spatial filter used by the terminal for the PUSCH transmission corresponding to a panel/TRP/transmission configuration indication (TCI)/PUSCH transmission occasion (TO).