Compressed Feedback for Coordinated Multipoint Transmission
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing channel-dependent information for coordinated multipoint transmission, leading to increased interference and feedback overhead, particularly in scenarios where multiple mobile communication devices influence each other's connections with network nodes.
Innovation Solution
A method and system for compressing and transmitting channel-dependent information using a combination of delta reports and lossless compression schemes, such as zip compression, to reduce feedback overhead while maintaining accurate channel state information, even under varying channel conditions and mobility scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel-dependent information is transmitted for coordinated multipoint transmission, then communication robustness is improved, but feedback overhead increases
Solution Approach 1:
The patent extracts only the essential channel-dependent information (channel quality indicator, precoding matrix indicator, rank indicator) from the complete channel state, transmitting only this compressed subset rather than full channel information. This extraction principle reduces feedback overhead while maintaining sufficient information for coordinated multipoint transmission decisions.
Solution Approach 2:
Instead of transmitting raw channel state information directly, the patent inverts the approach by transmitting compressed and processed channel-dependent information that has been transformed into a more efficient representation. The feedback is inverted from detailed channel measurements to condensed channel quality metrics.
2Object-affected harmful factors
If channel-dependent information of multiple mobile communication devices is collected, then interference reduction is improved, but device complexity increases
Solution Approach 1:
The patent segments the channel-dependent information from multiple devices into individual device reports, each containing device-specific channel quality indicators, precoding matrix indicators, and rank indicators. This segmentation allows the network to process information from multiple devices independently while reducing the complexity each device must manage.
Solution Approach 2:
The patent applies local quality by tailoring the channel-dependent information reporting to each specific device's channel conditions and requirements. Each mobile communication device transmits information optimized for its own channel characteristics, rather than all devices transmitting identical comprehensive data, thereby reducing overall system complexity.
3Loss of information
If compressed feedback information is used, then feedback overhead is reduced, but information precision deteriorates
Solution Approach 1:
The patent changes the parameters of channel state information representation by transforming detailed channel measurements into compressed channel-dependent metrics (CQI, PMI, RI). These parameter changes maintain the essential information needed for transmission optimization while significantly reducing feedback overhead. The network compensates for compression by using these parameters in conjunction with other available channel knowledge.
Data Source
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AI summary
The present invention provides a mobile communication device (10) comprising a sending and receiving unit (14) and a processing unit (12), wherein the sending and receiving unit (14) is adapted for the transmission of a signal pattern over a communication channel (16), wherein the signal pattern comprises a logical data unit having a defined size, wherein the processing unit (12) is adapted for compressing information prior to transmission using a compression scheme and wherein the logical data unit is adapted for containing the compresses information for transmission.