Base Station Cooperation Feedback Optimization
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Solution Overview
Problem
In wireless communication systems, base station cooperation for data transmission leads to increased consumption of uplink wireless resources for transmitting necessary information and higher processing demands for the cooperation scheduler, particularly due to the need for frequent channel quality feedback and resource allocation calculations, which can hinder performance especially in scenarios with multiple wireless communication terminals.
Innovation Solution
The proposed solution involves optimizing the process by having wireless communication terminals selectively transmit cooperation information only when necessary, using a cooperation scheduler that allocates resources efficiently, and employing subband-based transmission to reduce the amount of feedback data, thereby minimizing the use of uplink resources and reducing processing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If base station cooperation technology is implemented to improve user rate at cell edge, then channel quality and SINR are improved, but uplink wireless resource consumption increases due to frequent feedback transmission
Solution Approach 1:
The patent changes the parameter of feedback transmission from frequent/continuous to event-triggered, where feedback is transmitted only when channel quality changes exceed a threshold. This reduces uplink resource consumption while maintaining reliable channel quality information for base station cooperation
Solution Approach 2:
The patent extracts only the essential feedback information (channel quality indicators) that is necessary for base station cooperation, rather than transmitting all possible channel state information. This selective extraction reduces uplink resource usage while preserving the reliability needed for cooperation scheduling
2Productivity
If base station cooperation with multiple terminals is implemented, then system capacity and throughput are improved, but processing complexity of the cooperation scheduler increases
Solution Approach 1:
The patent segments the feedback information from multiple terminals into standardized, quantized formats that can be processed independently. By dividing the complex channel state information into discrete feedback reports with predetermined formats, the scheduler can efficiently handle multiple terminals without being overwhelmed by raw data complexity
Solution Approach 2:
The patent implements partial action by transmitting feedback information only when necessary (when channel quality changes exceed thresholds) rather than continuously for all terminals. This reduces the total processing load on the scheduler while maintaining sufficient information for achieving high system throughput through base station cooperation
3Measurement precision
If detailed channel quality feedback is transmitted frequently, then transmission accuracy and scheduling optimization are improved, but uplink resource efficiency deteriorates
Solution Approach 1:
The patent implements a threshold-based feedback mechanism where channel quality information is transmitted only when changes exceed a predetermined threshold. This ensures that the scheduler receives accurate and relevant channel quality feedback for optimization decisions, while avoiding unnecessary transmissions that would waste uplink resources
Solution Approach 2:
The patent changes the transmission parameter from continuous/frequent to event-driven, where the feedback transmission is triggered by significant channel quality changes. This maintains measurement precision by transmitting accurate channel information when needed, while improving uplink resource efficiency by eliminating redundant transmissions
Data Source
AI summary
It is provided a wireless communication system comprising base stations that transmit data to a terminal with cooperation by the base stations. The terminal communicates with the base stations. The terminal periodically transmits, to one of the base stations, information necessary for data transmission from a single base station out of the base stations. Each of the base stations determines whether the terminal needs data transmission through a cooperation among the base stations, and transmits a cooperation information transmission instruction to the terminal, which includes information necessary to execute the data transmission in order to cooperate among the base stations in the case where it is determined that the terminal needs the data transmission through the cooperation among the base stations. The terminal transmits the cooperation information to the base stations in a case of receiving the cooperation information transmission instruction.