CSI-RS Resource Association for NC-JT Overhead Reduction
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently configuring and managing Channel Measurement Resources (CMRs) and Interference Measurement Resources (IMRs) for Non-Coherent Joint Transmission (NC-JT) and Single TRP (sTRP) measurement hypotheses, particularly in dynamically indicating CMR pairs and updating CSI-IM configurations to reduce overhead and computation efforts.
Innovation Solution
A framework is proposed for associating CSI-IM with NC-JT/sTRP measurement hypotheses, using MAC-CE signaling to dynamically indicate CMRs, and explicitly or implicitly activating/deactivating CSI-IMs to optimize resource utilization and reduce overhead and computation burdens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple CSI-IM resources are configured for NC-JT and sTRP measurement hypotheses, then measurement accuracy and system performance are improved, but signaling overhead and device complexity increase
Solution Approach 1:
The patent applies universality by enabling a single CSI-IM resource to serve multiple measurement hypotheses (both NC-JT and sTRP) simultaneously. The network node configures a set of CMRs that can be dynamically associated with different measurement hypotheses, allowing the same CSI-IM resource to be reused across multiple hypotheses rather than allocating dedicated resources to each, thereby reducing signaling overhead while maintaining measurement capability
Solution Approach 2:
The patent implements dynamics through MAC-CE signaling that enables flexible, dynamic association between CMRs and measurement hypotheses. The system can adaptively activate or deactivate specific CMR associations based on current channel conditions and transmission requirements, allowing the configuration to change dynamically without requiring full reconfiguration, thus balancing measurement accuracy with reduced signaling overhead
2Adaptability or versatility
If dynamically indicating CMR pairs via MAC-CE signaling is implemented, then system flexibility and adaptability are improved, but processing overhead and computation efforts increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple CMRs and establishing their potential associations during initial setup. The MAC-CE signaling then only needs to indicate which pre-configured associations to activate, rather than transmitting full configuration details dynamically. This reduces the processing overhead of dynamic indication while maintaining system flexibility
Solution Approach 2:
The patent segments the CMR configuration into multiple pre-defined associations, each corresponding to a specific measurement hypothesis. The MAC-CE signaling operates on these segmented associations by activating or deactivating individual ones, which reduces the complexity of processing compared to managing a single monolithic configuration, thereby improving productivity while maintaining adaptability
3Productivity
If explicit activation/deactivation of CSI-IMs is implemented, then resource utilization efficiency is improved, but signaling overhead increases
Solution Approach 1:
The patent merges the activation/deactivation signaling for multiple CSI-IM resources into a unified MAC-CE message structure. Instead of sending separate activation commands for each CSI-IM resource, the system combines them into a single signaling operation that can control multiple resources simultaneously, thereby improving resource utilization efficiency while minimizing the increase in signaling overhead
Data Source
AI summary
There is provided a method performed by a UE for performing a plurality of CSI measurements for CSI reporting, wherein at least a first of the plurality of CSI measurements is based on a single CSI-RS resource and at least a second of the plurality of CSI measurements is based on a pair of CSI-RS resources, the UE being configured with a set of CMRs and a set of IMRs. The method may comprise: obtaining a configuration including an indication of: a first number (M) of resources in the set of CMRs for performing the first CSI measurement, a second number (N) of resource pairs from the set of CMRs for performing the second CSI measurement, a third number of resources in the set of IMRs, and an association between the resources in the set of CMRs and the resources in the set of IMRs, based on a first ordering of the M resources in the set of CMRs and in the set of IMRs and based on a second ordering of the N resource pairs in the set of CMRs and the N resources in the set of IMRs; and performing CSI measurements based at least on the obtained configuration.