PUSCH Resource Indication for Low-Overhead MTRP Repetition
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Solution Overview
Problem
In multiple transmit and receive point (MTRP) scenarios, the existing methods for physical uplink shared channel (PUSCH) transmission result in excessive DCI overheads due to the need to double the number of bits for indicating spatial relations and transmitted precoding matrix indicators (TPMIs), which is not feasible for supporting PUSCH repetition to multiple TRPs.
Innovation Solution
A method and apparatus that utilize sounding reference signal (SRS) resource indication, precoding matrix indicator (TPMI) indication, and phase tracking reference signal (PTRS) transmit port indication information to configure target transmission resources, reducing DCI overheads by allowing multiple spatial relations and TPMIs without increasing the bit count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two sets of parameters are used to support PUSCH repetition in MTRP scenario, then transmission reliability is improved, but DCI overhead increases due to doubled bit requirements for SRI and TPMI fields
Solution Approach 1:
The patent extracts and separates the indication of different parameter sets by introducing a new parameter (first indication information) that specifically identifies which set of SRS resource indication and TPMI parameters should be used. This allows the DCI to indicate only one set of parameters at a time rather than including both sets, thereby reducing overhead while maintaining the capability to support multiple parameter sets for transmission reliability.
2Adaptability or versatility
If the number of bits for SRI and TPMI fields is doubled to indicate two sets of parameters, then support for multiple transmission points is improved, but device complexity increases
Solution Approach 1:
The patent segments the parameter indication by dividing the parameter sets into different groups (first set and second set) and using a separate first indication information field to select between them. This segmentation allows the DCI structure to maintain adaptability for multiple transmission points while avoiding the complexity of a single large indication field that would require doubled bits.
3Ease of manufacture
If maximum of two spatial relations are used for PUSCH repetition, then implementation simplicity is maintained, but adaptability to more transmission points is limited
Solution Approach 1:
The patent introduces dynamic selection capability through the first indication information field, which allows the system to flexibly switch between different sets of spatial relations and TPMI parameters. This dynamic approach enables support for more than two transmission points by allowing the network to configure multiple parameter sets and dynamically indicate which set to use, without requiring a complete redesign of the entire parameter structure.
Data Source
AI summary
A PUSCH transmission method and apparatus, a device, and a storage medium are disclosed. The method includes: determining, by a terminal based on first indication information that is received, a target transmission resource configuration from at least one transmission resource configuration; and performing PUSCH transmission based on the target transmission resource configuration; where the first indication information includes at least one of the following: SRS resource indication information; TPMI indication information; and PTRS transmit port indication information.