Feedback Resource Allocation in Multi-Cell Cooperative Systems
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Solution Overview
Problem
In multi-cell cooperative communication systems, existing methods face challenges in efficiently selecting Base Stations (BSs) for user equipment (UE) and allocating feedback resources, leading to suboptimal data transmission rates due to limited feedback signals and increased computational complexity.
Innovation Solution
A method and device for a UE to select BSs based on distance and allocate feedback resources, creating feedback resource allocation information to optimize data transmission rates by minimizing the rate gap between unlimited and limited feedback systems, using techniques such as BS pairing and feedback bit allocation, and efficiently transmitting this information using run-length coding or matrix indices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If feedback resources are allocated to multiple BSs, then data transmission rate is improved, but computational complexity increases
Solution Approach 1:
The patent segments the feedback resource allocation process into two independent stages: (1) BS selection based on channel quality metrics, and (2) feedback bit allocation to selected BSs. This segmentation reduces computational complexity by breaking down the complex optimization problem into manageable sub-problems that can be solved separately.
Solution Approach 2:
The patent applies local quality by allocating different feedback bit lengths to different BSs based on their individual channel conditions. BSs with better channel quality receive fewer feedback bits, while those with poorer quality receive more bits, optimizing the overall system performance without requiring uniform complex processing across all BSs.
2Productivity
If feedback signal length is increased, then data transmission rate is improved, but feedback resource consumption increases
Solution Approach 1:
The patent implements local quality by varying the feedback signal length allocated to each BS according to its specific channel conditions. Instead of using a uniform long feedback signal for all BSs, the system allocates shorter feedback signals to BSs with good channel quality and longer signals only to those requiring more precision, thus improving data transmission rate while controlling overall feedback resource consumption.
Solution Approach 2:
The patent changes the parameter of feedback signal length dynamically based on channel quality metrics. The system adjusts the feedback bit allocation parameter for each BS individually, optimizing the balance between data transmission rate and feedback resource consumption by matching feedback precision to actual channel requirements.
3Productivity
If BS selection is optimized, then rate gap is minimized, but computation time increases
Solution Approach 1:
The patent segments the BS selection process into preliminary screening based on channel quality thresholds followed by optimized selection among candidate BSs. This segmentation reduces computation time by filtering out obviously suboptimal BSs early, allowing the system to focus computational efforts on selecting among a smaller set of promising candidates, thereby minimizing the rate gap without excessive computation time.
Solution Approach 2:
The patent applies preliminary action by pre-evaluating BS channel qualities and establishing selection criteria before the actual feedback allocation. This preliminary assessment of BS suitability based on channel metrics allows the system to quickly identify optimal BS candidates, reducing the time required for detailed optimization while still achieving minimal rate gap.
Data Source
AI summary
A UE is able to transmit a feedback signal to at least one of multiple BSs in a multi-cell cooperative communication system including the multiple BSs. The UE performs a method that includes: allocating a feedback resource for transmission of the feedback signal to the at least one BS in view of distances between the multiple BSs and the UE; creating feedback resource allocation information representing the result of the feedback resource allocation; and transmitting the created feedback allocation information to the multiple BSs.