CoMP Resource Management Set Size Restriction
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Solution Overview
Problem
In Multiple-Input Multiple-Output (MIMO) communication systems, existing CoMP transmission schemes face challenges in managing signaling overhead and UE processing complexity due to the large size of the CoMP measurement set, which affects feedback quality and system performance.
Innovation Solution
The central scheduler restricts the size of the CoMP Resource Management (CRM) set and CSI measurement set, selecting a subset of CSI-RS resources for measurement and feedback, using techniques like signal measurement calculation over multiple antenna ports and differential encoding to reduce overhead while maintaining feedback accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the CoMP measurement set size is increased to improve feedback quality and CoMP performance, then the feedback accuracy and system performance are improved, but the signaling overhead and UE processing complexity increase significantly
Solution Approach 1:
The patent segments the CoMP measurement set into two distinct sets: a larger CoMP Resource Management (CRM) set for comprehensive channel measurement, and a smaller CSI measurement set for actual CSI feedback. This segmentation allows the UE to measure channels across multiple transmission points in the CRM set while only providing detailed CSI feedback for a subset in the CSI measurement set, thereby reducing feedback overhead and processing complexity while maintaining measurement accuracy.
Solution Approach 2:
The patent extracts the essential measurement function from the feedback function. The UE performs channel measurements on all CSI-RS resources in the larger CRM set to assess channel quality, but only extracts and reports detailed CSI information for the smaller CSI measurement set. This extraction approach allows comprehensive channel awareness while minimizing the feedback burden on the UE.
2Measurement precision
If the CoMP measurement set size is increased to improve feedback quality, then the feedback accuracy is improved, but the signaling overhead increases
Solution Approach 1:
The patent segments the feedback process into two stages: channel measurement on the comprehensive CRM set and selective CSI reporting on the reduced CSI measurement set. This segmentation enables the system to maintain accurate channel knowledge through extensive measurement while reducing the signaling overhead by reporting CSI only for a subset of transmission points.
Solution Approach 2:
The patent applies partial action by having the UE perform full channel measurements on all CRM set resources (excessive measurement) but only report CSI for the smaller CSI measurement set (partial feedback). This approach ensures comprehensive channel awareness while minimizing the actual feedback signaling overhead to the network.
3Device complexity
If the CoMP measurement set size is restricted to reduce UE processing complexity, then the processing complexity is reduced, but the feedback quality and CoMP performance deteriorate
Solution Approach 1:
The patent segments measurement and feedback functions into two sets: the CRM set for comprehensive channel assessment and the CSI measurement set for focused feedback. The UE measures channels on all CRM set resources to maintain system performance awareness, but only processes detailed CSI reporting for the smaller CSI measurement set, thus reducing processing complexity while preserving CoMP performance.
Solution Approach 2:
The patent introduces the CRM set as an intermediary between the full CoMP resource pool and the CSI measurement set. This intermediary allows the UE to indirectly assess channel conditions across all transmission points through measurement without the burden of comprehensive CSI reporting, thereby maintaining system performance awareness while reducing processing complexity.
4Adaptability or versatility
If a larger set of CSI-RS resources is configured for CSI feedback, then the coverage and measurement options are increased, but the CSI reporting overhead and UE processing complexity increase
Solution Approach 1:
The patent segments the CSI-RS resources into two functional groups: the CRM set that provides comprehensive measurement options across multiple transmission points, and the CSI measurement set that provides a reduced subset for actual CSI reporting. This segmentation maintains measurement versatility while reducing reporting overhead.
Solution Approach 2:
The patent applies partial action by configuring the UE to measure CSI-RS resources across the larger CRM set (providing comprehensive measurement options) but only requiring CSI feedback for the smaller CSI measurement set. This approach ensures the UE has access to diverse measurement options while minimizing the actual CSI reporting burden.
Data Source
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AI summary
A method includes receiving, at a communication terminal (24), signals from a group of cells (28) that cooperate in a Coordinated Multipoint (Co MP) transmission scheme. Signaling (64) that specifies a Co MP resource management (CRM) set is received at the communication terminal. The CRM set includes a subset of the cells in the group for which the communication terminal is to perform signal measurements. A size of the CRM set is restricted to a predefined maximum size. The signal measurements are performed at the communication terminal only on the signals received from one or more of the cells in the CRM set. The signal measurements performed on the one or more of the cells in the CRM set are reported from the communication terminal.