SRS Resource Set Configuration for Multi-TRP Wireless Systems
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Solution Overview
Problem
As the number of Transmission and Reception Points (TRPs) increases in wireless communication systems, the number of Sounding Reference Signal (SRS) resources also increases excessively, leading to inefficient resource utilization and implementation complexity.
Innovation Solution
A method where a user equipment receives configuration information related to SRS, including information on at least one SRS resource set, and transmits the SRS based on this set, with each SRS resource related to one or more TCI-states or spatial relation configurations, allowing for periodic or semi-persistent time domain behavior without requiring additional SRS resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SRS resources are configured separately for each TRP to support coordinated joint transmission, then the system can support multiple TRPs for CJT usage, but the number of SRS resources increases excessively
Solution Approach 1:
A single SRS resource set is configured to serve multiple TRPs simultaneously. The SRS resource set is associated with multiple TCI-states, each TCI-state corresponding to a different TRP, allowing the same SRS resources to be used for channel sounding towards multiple transmission points without requiring separate SRS resources for each TRP.
Solution Approach 2:
The system changes the TCI-state parameter dynamically to switch between different TRPs. Instead of creating separate SRS resources for each TRP, the invention modifies the TCI-state association of an existing SRS resource set, allowing the same SRS resources to be directed towards different TRPs by changing the active TCI-state.
2Productivity
If additional SRS resources are configured for each TRP, then SRS transmissions can be increased to support multiple TRPs, but implementation complexity increases
Solution Approach 1:
The SRS resource set is designed to be universal across multiple TRPs. By associating a single SRS resource set with multiple TCI-states, the system eliminates the need for separate SRS resource configurations for each TRP, thereby reducing implementation complexity while maintaining the ability to perform SRS transmissions to multiple TRPs.
Solution Approach 2:
Multiple TCI-states are merged into a single SRS resource set configuration. Instead of having separate SRS resources for each TRP, the invention combines the functionality of multiple TRP-specific configurations into one unified SRS resource set that can be activated with different TCI-states depending on which TRP is the current target.
3Measurement precision
If SRS resources are increased to support antenna switching for DL CSI acquisition, then channel estimation accuracy improves, but resource utilization efficiency decreases
Solution Approach 1:
The same SRS resource set is used for both channel sounding and antenna switching purposes across multiple TRPs. By making the SRS resources universal and not TRP-specific, the system achieves efficient resource utilization while still obtaining accurate channel estimates for multiple transmission points through dynamic TCI-state switching.
Data Source
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AI summary
A method performed by a terminal in a wireless communication system, according to an embodiment of the present specification, comprises the steps of: receiving configuration information related to a sounding reference signal (SRS), wherein the configuration information comprises information on at least one SRS resource set; and transmitting the SRS on the basis of the at least one SRS resource set. The at least one SRS resource set comprises one or more SRS resources. The SRS resources are characterized in that each SRS resource is related to one or more TCI-states or one or more spatial relation configurations.