CoMP Feedback Signal Allocation for Cell Edge Interference
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Solution Overview
Problem
In cellular mobile communication systems, User Equipment (UE) located at the edge of cells experience reduced data transmission rates due to interference from neighboring cells, leading to inefficient data transmission and reception, especially in Cooperative Multi-Point (CoMP) systems where multiple cells cooperate to provide service.
Innovation Solution
A method and apparatus for efficiently transmitting and receiving feedback signals in CoMP systems by utilizing a Channel Status Information Reference Signal (CSI-RS) allocation scheme, where UE identifies and generates feedback based on CSI-RS allocation information, enabling dynamic cell selection and joint transmission schemes to optimize channel estimation and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CoMP system uses multiple cells to cooperate for downlink transmission, then data transmission rate for cell edge UEs is improved, but system complexity and feedback management difficulty increases
Solution Approach 1:
The patent segments the feedback management by separating CoMP set feedback from non-CoMP set feedback. The terminal device identifies different feedback sets corresponding to different cell groups, allowing independent feedback processing for each set. This segmentation reduces the overall feedback management complexity while maintaining the cooperative transmission benefits across multiple cells.
Solution Approach 2:
The patent implements dynamic feedback management where the terminal device dynamically identifies and processes feedback for different sets of cells. The feedback timing and resource allocation are dynamically adjusted based on the detected feedback modes for CoMP and non-CoMP sets, allowing the system to adapt to varying channel conditions and coordination requirements without fixed complex structures.
2Ease of operation
If feedback timing is unified for all cells, then system operation is simplified, but feedback accuracy for different cell conditions deteriorates
Solution Approach 1:
The patent applies local quality by allowing different feedback timings for different feedback sets. The terminal device detects first feedback timing for CoMP set feedback and second feedback timing for non-CoMP set feedback independently. This enables each cell group to have optimized feedback timing suited to its specific channel conditions and coordination requirements, improving measurement precision without requiring fully unified system operation.
Solution Approach 2:
The system dynamically determines feedback timing based on the detected feedback mode and set identification. The terminal device can adaptively select appropriate feedback resources and timing for each feedback set, allowing the system to balance between operational simplicity and measurement accuracy based on current channel conditions and coordination needs.
3Measurement precision
If separate feedback resources are allocated for different cell sets, then feedback accuracy improves, but resource allocation complexity increases
Solution Approach 1:
The patent segments feedback resources into distinct resources for CoMP set feedback and non-CoMP set feedback. The terminal device identifies first feedback resources corresponding to the CoMP set and second feedback resources corresponding to the non-CoMP set. This segmentation provides clear resource separation that improves feedback accuracy by preventing interference between different feedback types, while the structured identification process manages resource allocation complexity through systematic rather than arbitrary resource assignment.
Data Source
AI summary
A method and an apparatus for transmitting and receiving a feedback signal in a cellular mobile communication system is provided. The method of transmitting feedback in a Cooperative Multi-Point (CoMP) system, includes receiving feedback set information including allocation information of a Channel Status Information Reference Signal (CSI-RS) transmitted for estimating a channel of a User Equipment (UE), receiving IDentification (ID) information for identifying a CoMP set including CSI-RS allocation information from a cell operating in a CoMP mode, extracting the CoMP set using the ID information and a feedback set, detecting a first feedback mode and first feedback timing with a first CSI-RS not included in the CoMP set among CSI-RSs included in the feedback set, and generating and transmitting feedback with respect to the first CSI-RS according to the detected first feedback mode and the first feedback timing.