Uplink Precoding Matrix Indication for Multi-Beam Reliability
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Solution Overview
Problem
Current communication technologies, specifically in Rel-15 and Rel-16 specifications, require the same transmission beam and precoding matrix for each Physical Uplink Shared Channel (PUSCH), which limits the reliability of PUSCH transmission when multiple PUSCHs are scheduled, as Rel-17 specifications aim to support different transmission beams for improved reliability.
Innovation Solution
The proposed solution involves indicating multiple transmission precoding matrices in the Downlink Control Information (DCI) using a precoding information field, allowing User Equipment (UE) to determine and use corresponding precoding matrices for each transmission beam, thereby enabling different beams for improved reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the same transmission beam and precoding matrix are used for each PUSCH (Rel-15/Rel-16 specification), then the device complexity is reduced and ease of operation is improved, but the transmission reliability deteriorates
Solution Approach 1:
The precoding information field in DCI is segmented to carry multiple transmission precoding matrices corresponding to different transmission beams. Each PUSCH can be associated with a specific precoding matrix from this set, enabling beam diversity while maintaining a unified DCI structure. This segmentation allows the system to support multiple beams without requiring separate DCI messages for each beam.
Solution Approach 2:
The precoding information field in DCI is designed to serve multiple functions: it can indicate a single precoding matrix for legacy compatibility (Rel-15/Rel-16) or multiple precoding matrices for enhanced reliability (Rel-17). This multi-functionality allows the same DCI structure to support both the simplified single-beam operation and the more reliable multi-beam operation, resolving the contradiction between complexity and reliability.
2Reliability
If multiple transmission beams are supported for different PUSCHs (Rel-17 specification), then the transmission reliability is improved, but the DCI structure complexity increases
Solution Approach 1:
The DCI message preliminarily indicates a set of transmission precoding matrices before the actual PUSCH transmission occurs. The UE uses this pre-indicated set to determine the appropriate precoding matrix for each PUSCH based on the sounding reference signal resource indication. This preliminary indication simplifies the operation by providing all necessary precoding information in advance, avoiding complex real-time decisions.
Solution Approach 2:
The sounding reference signal resource indication field acts as an intermediary that links the precoding information field to the actual beam selection. Instead of directly indicating which beam to use for each PUSCH, the system uses the SRI field to indirectly select from the set of precoding matrices indicated in the precoding information field. This intermediary mechanism simplifies the overall operation by decoupling the beam indication from the precoding matrix indication.
Data Source
AI summary
An uplink data transmission method, a user equipment, and a readable storage medium are provided. The method includes: receiving DCI, wherein the DCI includes a sounding reference signal resource indication field and a precoding information field, the sounding reference signal resource indication field includes indication information of two or more transmission beams corresponding to to-be-transmitted uplink data, and the precoding information field includes transmission precoding matrix indication information corresponding to each of the two or more transmission beams; determining a transmission precoding matrix corresponding to each transmission beam based on the transmission precoding matrix indication information corresponding to the transmission beam; and transmitting uplink data based on the transmission precoding matrix corresponding to each transmission beam. By the method, the transmission precoding matrices corresponding to multiple transmission beams are indicated in DCI, thereby improving reliability of uplink data transmission.