CoMP CQI Measurement via Valid CSI-RS Resource Pairs
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Solution Overview
Problem
In CoMP radio communication systems, the existing methods for channel quality information (CQI) measurement and feedback are inefficient, leading to unnecessary calculations and power consumption due to incorrect interference calculations and feedback overhead.
Innovation Solution
A method where the network provides explicit or implicit information about interference-measuring resources to the user terminal, allowing it to select valid pairs of CSI-RS and ZP-CSI-RS for accurate CQI calculation and reduce unnecessary feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the user terminal performs CQI measurement and feedback for all CSI-RS resources in the CoMP measurement set, then the channel quality information coverage is improved, but the feedback overhead and power consumption increase significantly
Solution Approach 1:
The patent extracts and identifies only the necessary CSI-RS resources for CQI measurement by introducing the concept of valid CSI-RS resource pairs. The network configures the terminal with specific pairs of CSI-RS resources (one for signal measurement, one for interference measurement) that are actually needed for CoMP scheduling decisions, eliminating the need to measure all possible resources in the measurement set.
Solution Approach 2:
The patent segments the CQI feedback process by dividing it into multiple reports, each associated with a specific valid CSI-RS resource pair. Instead of providing a single comprehensive CQI report for all resources, the system creates segmented feedback reports that are more manageable and reduce overall overhead while maintaining necessary information coverage.
2Measurement precision
If the user terminal calculates CQI for all CSI-RS resources, then the measurement precision is improved, but the calculation complexity and feedback overhead increase
Solution Approach 1:
The patent extracts only the essential measurement components by defining valid CSI-RS resource pairs. The network identifies and signals to the terminal which specific CSI-RS resources form valid pairs for measurement, allowing the terminal to focus calculations on only those resources that contribute to accurate CQI for active CoMP transmission points, rather than performing exhaustive measurements on all resources.
Solution Approach 2:
The network performs preliminary identification and configuration of valid CSI-RS resource pairs before the terminal performs measurements. By pre-determining which resource pairs are valid based on network configuration and current CoMP scheduling intentions, the system eliminates the need for the terminal to perform complex analysis of all possible resource combinations, reducing calculation complexity while maintaining measurement precision.
3Adaptability or versatility
If the network configures multiple non-zero-power CSI-RS resources for CoMP measurement, then the adaptability to different CoMP schemes is improved, but the feedback overhead increases due to unnecessary CQI reports
Solution Approach 1:
The patent introduces dynamic selection of valid CSI-RS resource pairs based on current network conditions and CoMP transmission schemes. The network can dynamically configure which CSI-RS resources form valid pairs, allowing the system to adapt to different CoMP schemes (joint transmission, dynamic point selection, coordinated beamforming) while the terminal only performs measurements and feedback for the currently valid pairs, reducing overhead.
Solution Approach 2:
The valid CSI-RS resource pair concept serves multiple functions: it identifies signal measurement resources, identifies interference measurement resources, indicates which CoMP transmission points are actively serving the terminal, and determines which CQI reports are necessary. This multi-functional approach allows the system to support various CoMP schemes universally without requiring separate configuration mechanisms for each scheme.
Data Source
AI summary
A radio communication system includes a network and a user terminal, wherein the network includes a plurality of radio stations and a controller which controls the plurality of radio stations, wherein at least two of the plurality of radio stations communicate with the user terminal, wherein the controller notifies the user terminal of information about resource for interference measurement, wherein the user terminal calculates and reports channel quality information based on the information.