CQI Calculation Assuming Unmapped CRS Resources
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in efficiently calculating channel state information in multi-cell environments, which affects the accuracy of channel quality indicators (CQI) and overall network performance.
Innovation Solution
A method for reporting CQI in a multi-cell based wireless communication system, where user equipment receives configuration information about CSI processes, including CSI-RS, and calculates CQI assuming data is not mapped to a cell-specific reference signal (CRS) resource, allowing for efficient channel state information calculation and reporting to the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CQI is calculated using conventional methods in multi-cell environments, then calculation complexity is reduced, but CQI accuracy deteriorates
Solution Approach 1:
The patent segments the channel state information calculation by separating CRS resource identification from CQI calculation. The UE first identifies CRS resources associated with the serving cell, then calculates CQI assuming data is not mapped to those specific CRS resources. This segmentation allows accurate multi-cell CQI reporting without requiring complex interference measurement across all possible CRS resources.
Solution Approach 2:
The patent applies local quality by making the CQI calculation assumption specific to the serving cell's CRS resources rather than applying a uniform assumption across all cells. The UE assumes data is not mapped only to the serving cell's CRS resources when calculating CQI, which locally optimizes the calculation for the serving cell while maintaining accuracy in multi-cell environments.
2Measurement precision
If data mapping to CRS resources is considered in CQI calculation, then CQI accuracy improves, but calculation time increases
Solution Approach 1:
The patent applies preliminary action by having the UE pre-identify the CRS resources associated with the serving cell before performing CQI calculation. The network configures the UE with information about which CRS resources belong to the serving cell, so the UE can immediately apply the assumption that data is not mapped to those specific resources during CQI calculation, avoiding time-consuming analysis during the calculation phase.
3Productivity
If conventional CQI calculation methods are used, then system simplicity is maintained, but network performance in multi-cell environments deteriorates
Solution Approach 1:
The patent extracts the serving cell's CRS resource identification from the overall CQI calculation process. By separating the identification of serving cell CRS resources (configured by the network) from the CQI calculation itself, the patent enables accurate multi-cell CQI reporting without requiring the UE to perform complex interference measurements across all cells, thus improving network performance with moderate complexity increase.
Data Source
AI summary
The present application discloses a method for enabling a terminal to report CQI (Channel Quality Indicator) in a wireless communications system. Specifically, the method includes the steps of: receiving the setup information concerning at least one CSI (Channel Status Information Process) through an upper layer; receiving CSI-RS (Channel Status Information-Reference Signal) contained in the setup information from a base station; calculating the CQI by using the CSI-RS under the assumption that the CRS (Cell specific RS) resource contained in a given resource for calculating the CQI is not mapped with data; and reporting the calculated CQI to the base station, wherein the setup information contains the information of the CRS resource.