Dynamic Multi-TRP SRS Configuration to Reduce RRC Overhead
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Solution Overview
Problem
Existing multi-TRP based PUSCH transmission in 5G NR systems face challenges with large signaling overhead and inflexibility due to frequent RRC reconfigurations, especially with increasing antenna numbers, which hampers adaptability to terminal capabilities and channel/interference changes.
Innovation Solution
The method involves dynamically adjusting SRS resource configurations in SRS resource sets associated with TRPs to adapt to changes in terminal capabilities and interference, reducing the need for RRC reconfigurations and minimizing signaling overhead through MAC-CE signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RRC reconfiguration is used to adjust SRS resource settings, then adaptability to terminal capabilities and channel changes is improved, but signaling overhead increases and system flexibility decreases
Solution Approach 1:
The patent segments the SRS resource configuration into two parts: semi-static parameters configured via RRC and dynamic parameters adjusted via MAC-CE signaling. This segmentation allows critical parameters to be updated frequently without triggering full RRC reconfiguration, thereby reducing signaling overhead while maintaining adaptability.
Solution Approach 2:
The patent introduces MAC-CE signaling as an intermediary mechanism between RRC configuration and actual SRS resource adjustment. MAC-CE provides a middle-ground solution that enables faster updates than RRC reconfiguration but with lower overhead than complete reconfiguration, effectively mediating between adaptability requirements and signaling overhead constraints.
2Adaptability or versatility
If RRC reconfiguration is used to adjust SRS resource settings, then adaptability to terminal capabilities and channel changes is improved, but system flexibility and response time worsen
Solution Approach 1:
The patent performs preliminary configuration of SRS resource sets via RRC signaling, including multiple candidate configurations. When channel conditions change, the network can quickly switch between pre-configured options using MAC-CE signaling, avoiding the time-consuming process of full RRC reconfiguration and thus improving response time.
Solution Approach 2:
The patent implements dynamic switching between different SRS resource configurations based on channel conditions and terminal capabilities. By maintaining multiple pre-configured options and enabling rapid switching through MAC-CE signaling, the system achieves both adaptability and fast response time without being constrained by slow RRC reconfiguration cycles.
3Reliability
If multiple SRS resource sets are configured for multi-TRP scenarios, then uplink CSI acquisition performance is improved, but device complexity and configuration management difficulty increase
Solution Approach 1:
The patent designs SRS resource sets with universal structures that can be applied across different TRPs and transmission scenarios. Each resource set follows a standardized configuration template, allowing the same management procedures to handle multiple TRPs uniformly, thereby reducing configuration management complexity while maintaining multi-TRP performance.
Solution Approach 2:
The patent manages complexity by controlling which parameters are dynamically adjustable versus those that remain fixed. By identifying and fixing certain configuration parameters while allowing others to be modified through MAC-CE signaling, the system maintains improved CSI acquisition performance across multiple TRPs without overwhelming configuration management complexity.
Data Source
AI summary
A method for sending a sounding reference signal (SRS) includes: sending SRS configuration information for uplink channel state information (CSI) acquisition to a terminal, the SRS configuration information including one or more SRS resource sets, the one or more SRS resource sets being associated with one or more transmission and reception points (TRPs) for an uplink physical uplink shared channel (PUSCH) transmission, and each SRS resource set comprising at least one SRS resource; and dynamically adjusting a resource configuration of the one or more SRS resource sets according to target information.