CoMP Transmission in Carrier Aggregated LTE-A Systems
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Solution Overview
Problem
In the LTE-A system, applying CoMP transmission/reception between cells with different radio base stations using a system band formed by aggregating multiple fundamental frequency blocks becomes complex, and while CoMP can improve received quality, it limits broadbandization.
Innovation Solution
A radio communication system that allows CoMP transmission/reception between cells corresponding to the same fundamental frequency blocks, using a mechanism of carrier aggregation, where cells from different radio base stations are selected to form a system band, enabling flexible CoMP and reporting information about the cell combinations performing coordinated multiple-point transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CoMP transmission/reception is applied between cells of different radio base station apparatuses in a system band formed by aggregating multiple fundamental frequency blocks, then received quality in user terminals is improved, but control complexity becomes excessive
Solution Approach 1:
The system band formed by carrier aggregation is segmented into multiple fundamental frequency blocks (component carriers). CoMP transmission/reception is applied selectively to specific component carriers rather than across the entire aggregated band. This segmentation allows CoMP to be implemented in a controlled manner on individual component carriers while maintaining carrier aggregation benefits, thereby improving received quality without overwhelming control complexity.
2Reliability
If CoMP transmission/reception is applied to a configuration using a single limited fundamental frequency block, then received quality in user terminals is improved, but broadbandization cannot be realized sufficiently
Solution Approach 1:
The invention merges carrier aggregation and CoMP transmission/reception technologies. Multiple fundamental frequency blocks (component carriers) are aggregated to form a wide system band for broadbandization. Simultaneously, CoMP transmission/reception is applied to specific component carriers within this aggregated band. This combination allows the system to achieve both sufficient broadbandization through carrier aggregation and improved received quality through CoMP on selected component carriers.
Data Source
AI summary
The present invention is designed to apply CoMP transmission/reception flexibly in a system band that is formed with a plurality of fundamental frequency blocks, improve received quality in user terminals, and also widen the system band. A first radio base station apparatus (20A) that transmits downlink data to a user terminal (10) using a plurality of cells that respectively correspond to fundamental frequency blocks of varying frequency bands, and a second radio base station apparatus (20B) that transmits downlink data to the user terminal (10) using a cell that corresponds to fundamental frequency block of the same frequency band as one of a plurality of cells are provided, and the first radio base station apparatus (20A) and the second radio base station apparatus (20B) perform coordinated multiple-point transmission for the user terminal 10 between cells corresponding to the same fundamental frequency block, and also report information about the combination of cells that perform the coordinated multiple-point transmission to the user terminal (10).