Multi-TRP PUSCH Transmission via SRS Resource Segmentation
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Solution Overview
Problem
Current 5G NR network standards do not adequately address the configuration and activation of multiple sounding reference signal (SRS) resources corresponding to multiple transmission and reception points (TRPs) in multi-TRP operations, which affects the reliability and efficiency of physical uplink shared channel (PUSCH) transmissions.
Innovation Solution
The proposed solution involves configuring a user equipment (UE) with multiple SRS resource sets corresponding to multiple TRPs and transmitting downlink control information (DCI) that includes an enhanced SRS resource indicator (SRI) to select the appropriate resources for PUSCH transmissions to each TRP, enabling efficient operation between multi-TRP and single-TRP modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple SRS resource sets are configured for multi-TRP operation, then the reliability and throughput of PUSCH transmissions are improved, but the device complexity increases
Solution Approach 1:
The patent segments the SRS resource configuration into separate sets, where each set corresponds to a specific TRP. This allows the UE to manage multiple TRPs independently by configuring and selecting from distinct resource sets, thereby improving reliability through multi-TRP diversity while maintaining manageable complexity through structured organization
Solution Approach 2:
The patent introduces dynamic switching between multi-TRP and single-TRP operation modes based on network conditions. The UE can transition between these modes flexibly, allowing the system to adapt to changing requirements and optimize the balance between reliability improvement and device complexity
2Productivity
If multiple SRS resource sets are configured for multi-TRP operation, then the throughput of PUSCH transmissions is improved, but the ease of operation deteriorates
Solution Approach 1:
The patent employs feedback mechanisms where the gNB provides DCI indications that specify which SRS resource set and specific resources should be used for PUSCH transmissions. This feedback-driven approach automates the resource selection process, enabling the UE to achieve high throughput through multi-TRP operation without manually managing the complexity of multiple resource sets
Solution Approach 2:
The patent changes the operational parameters by introducing separate SRS resource sets for different TRPs and using DCI-based indication to select among them. This parameter change allows the system to maintain high throughput while simplifying operation through standardized selection procedures rather than manual configuration
3Device complexity
If single-TRP operation mode is used, then the device complexity is reduced, but the reliability of PUSCH transmissions deteriorates
Solution Approach 1:
The patent enables dynamic switching between single-TRP and multi-TRP operation modes. When network conditions require higher reliability, the system transitions to multi-TRP mode; when simplicity is preferred, it operates in single-TRP mode. This dynamic adaptability allows the system to optimize the trade-off between complexity and reliability based on real-time requirements
Data Source
AI summary
A user equipment (UE) is configured to communicate with one or more transmission and reception points (TRPs). The UE receives a sounding reference signal (SRS) resource set configuration including a first resource set corresponding to a first transmission and reception point (TRP) and a second resource set corresponding to a second TRP, receives a downlink control information (DCI) transmission including an SRS resource indicator (SRI) indicating (i) which resource from the first resource set should be selected for a first physical uplink shared channel (PUSCH) transmission to a first TRP, and (ii) which resource from the second resource set should be selected for a second PUSCH transmission to a second TRP and transmits the first PUSCH transmission to the first TRP and the second PUSCH transmission to the second TRP.