CRI Extension for Multi-TRP CSI Reporting
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Solution Overview
Problem
In multi-TRP wireless communication systems, UEs face challenges in measuring and reporting CSI due to the complexity of coordinating transmissions from multiple TRPs, particularly in managing channel measurement resources and determining which TRP to send reports to.
Innovation Solution
A method where the UE measures reference signals from multiple TRPs, calculates CSI based on these signals, and sends reports that include information for both TRPs, using a flexible mechanism to extend the CSI reporting configuration and manage CPU occupancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE measures and reports CSI for multiple TRPs simultaneously, then the communication reliability and data rates are improved, but the complexity of coordinating transmissions and managing channel measurement resources increases
Solution Approach 1:
The patent segments the multi-TRP CSI reporting into multiple independent single-TRP CSI reports. Each TRP is assigned a separate CSI report with its own CRI, PMI, and CQI, allowing the UE to measure and report channel state information for each TRP independently. This segmentation reduces the coordination complexity by treating multiple TRPs as separate entities rather than requiring joint processing of all TRPs simultaneously.
Solution Approach 2:
The patent introduces a new dimension to CSI reporting by extending the CRI (CSI-RS Resource Indicator) to support multiple TRPs. Instead of using a single CRI field, the system employs multiple CRI fields or an extended CRI structure that can identify multiple TRPs. This dimensional extension allows the UE to report CSI for multiple TRPs without increasing the complexity of the reporting mechanism itself.
2Measurement precision
If the UE reports detailed CSI for multiple TRPs, then the channel state information accuracy is improved, but the uplink signaling overhead increases
Solution Approach 1:
The patent segments the CSI reporting into multiple independent reports, each containing CRI, PMI, and CQI for a specific TRP. By segmenting the reporting structure, the system maintains high CSI accuracy for each individual TRP while organizing the information in a compact manner that reduces overall signaling overhead compared to reporting joint multi-TRP CSI.
Solution Approach 2:
The patent uses a universal CSI reporting framework that can be applied to both single-TRP and multi-TRP scenarios. The same reporting structure (CRI, PMI, CQI) is used for each TRP, allowing the system to maintain consistency and efficiency. This multi-functionality enables the reporting mechanism to handle multiple TRPs without requiring separate specialized reporting procedures for each case.
3Adaptability or versatility
If the system configures multiple channel measurement resources for multiple TRPs, then the CSI measurement capability is improved, but the resource management complexity increases
Solution Approach 1:
The patent segments the channel measurement resources into separate resource sets, each associated with a specific TRP. Each resource set contains CSI-RS resources that the UE can measure independently for the corresponding TRP. This segmentation simplifies resource management by allowing the network to configure and track resources on a per-TRP basis rather than managing a single complex multi-TRP resource set.
Solution Approach 2:
The patent introduces TRP-specific identifiers (such as TRP IDs or CRI fields) as intermediaries that link channel measurement resources to their corresponding TRPs. These identifiers act as mediators that help the UE associate measured resources with the correct TRP, reducing the complexity of resource management by providing clear mapping relationships without requiring complex coordination protocols.
Data Source
AI summary
A UE measures RSs from at least two different groups of RSs transmitted from at least two different TRPs from corresponding different base stations. The UE calculates CSI for the at least two TRPs based on RSs configured in the at least two different groups. The UE sends report(s) corresponding to the calculated CSI, the report(s) comprising information for at least the two TRPs of a number of reported hypotheses for a single-TRP measurement and a corresponding association to a number of configured hypotheses for a single-TRP measurement. A TRP, under control of the base station, sends the RSs and receives the report(s).