PUSCH Transmission via SRI Field for Multi-TRP Power Control
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Solution Overview
Problem
Current wireless communication systems face challenges in supporting explosive data traffic, high transmission rates, increased device connectivity, low latency, and energy efficiency, particularly in transmitting and receiving physical uplink shared channels (PUSCH) and sounding reference signals (SRS) between terminals and multiple transmission reception points (TRPs).
Innovation Solution
A method and apparatus for transmitting and receiving PUSCHs, where downlink control information (DCI) schedules PUSCHs on multiple transmission occasions, with power control parameters determined by an SRS resource indicator (SRI) field, allowing for reliable data transmission and flexible power control across multiple TRPs, reducing signaling overhead, and configuring SRS resources per TRP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple PUSCHs are transmitted to multiple TRPs using separate DCI for each TRP, then reliability of data transmission is improved, but signaling overhead increases
Solution Approach 1:
The patent combines multiple DCI messages into a single DCI that schedules multiple PUSCH transmissions to different TRPs. The DCI includes a SRI field that indicates multiple SRS resources corresponding to different TRPs, allowing the terminal to determine power control parameters for each TRP from a single DCI message. This merging approach maintains reliability by still enabling multi-TRP transmission while significantly reducing signaling overhead compared to separate DCI messages for each TRP.
Solution Approach 2:
The patent makes the SRI field in DCI multi-functional by enabling it to indicate multiple SRS resources that correspond to different TRPs. Instead of having separate DCI fields for each TRP, the SRI field universally indicates resources for multiple TRPs through a single field, allowing one DCI to serve multiple scheduling functions simultaneously.
2Adaptability or versatility
If power control parameters are individually configured for each TRP, then flexible power control is achieved, but device complexity increases
Solution Approach 1:
The patent applies local quality by associating different power control parameters with specific SRS resources that correspond to different TRPs. Each SRS resource has its own power control parameters (P0, alpha), and the terminal selects the appropriate parameters based on which SRS resource is indicated in the SRI field for each transmission occasion. This allows flexible, TRP-specific power control without requiring separate global configurations for each TRP.
Solution Approach 2:
The patent uses preliminary action by pre-configuring multiple SRS resources with their respective power control parameters before actual PUSCH transmission. The terminal and network establish the SRS resource set and associated power control parameters in advance, so that when the DCI is received, the terminal can immediately determine the appropriate parameters for each TRP based on the SRI field without requiring complex real-time configuration.
3Reliability
If SRS resources are configured per TRP, then transmission reliability to multiple TRPs is improved, but loss of information due to signaling overhead increases
Solution Approach 1:
The patent merges the configuration of multiple SRS resources for different TRPs into a single SRS resource set that is indicated by a single field in the DCI. Instead of having separate configuration messages for each TRP's SRS resources, the network configures a set of SRS resources and indicates the relevant subset through the SRI field in one DCI message, reducing signaling overhead while maintaining the ability to target multiple TRPs.
Data Source
AI summary
Disclosed are a method and apparatus for transmitting/receiving a physical uplink shared channel (PUSCH) in a wireless communication system. According to one embodiment of the present disclosure, a method for transmitting a PUSCH may comprise: a step of receiving downlink control information (DCI) for PUSCH scheduling form a base station; and a step of transmitting the PUSCH to the base station. The PUSCH is transmitted at N (N is a natural number) transmission occasions (TOs), wherein at each TO, one or more power control parameters of the PUSCH may be determined on the basis of an SRS resource indicator (SRI) field value in the DCI.