Wireless Terminal Feedback Bit Allocation for Distributed Base Stations
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Solution Overview
Problem
In virtual cellular network communication systems, the dynamic nature of base stations and interference sources complicates the use of existing feedback methods, leading to performance degradation due to incomplete channel information.
Innovation Solution
A method and apparatus for efficiently determining and transmitting feedback bits in a wireless communication system, where terminals prioritize channel information from candidate serving base stations to maximize the expected average rate, thereby minimizing performance loss caused by incomplete channel information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing feedback methods are used in virtual cellular network communication systems, then the system can operate with distributed small base stations, but performance degradation occurs due to incomplete channel information caused by dynamic base station and interference source configurations
Solution Approach 1:
The patent segments the feedback transmission process into multiple stages: determining candidate serving base stations, quantizing channel information for these candidates, and prioritizing feedback based on channel conditions. This segmentation allows the system to handle dynamic configurations by focusing feedback resources on the most relevant base stations rather than attempting to feedback all possible configurations simultaneously
Solution Approach 2:
The patent applies preliminary action by having terminals determine candidate serving base stations and quantize channel information before actual service delivery. This pre-processing of channel information allows the system to prepare feedback in advance, ensuring that when dynamic base station configurations occur, the necessary channel information is already available and prioritized for feedback transmission
2Device complexity
If feedback bits are allocated uniformly across all base stations, then the feedback structure remains simple, but performance loss increases due to incomplete channel information from dynamic interference sources
Solution Approach 1:
The patent applies local quality by allocating feedback bits non-uniformly based on local channel conditions. Specifically, terminals quantize channel information for candidate serving base stations with higher priority when channel conditions are better, concentrating feedback resources on the most critical base stations rather than distributing bits uniformly across all base stations
3Productivity
If the transmitter uses interference information from respective terminals to improve system performance, then communication performance improves, but the complexity of managing dynamic interference sources in virtual cellular networks increases
Solution Approach 1:
The patent implements feedback mechanisms where terminals transmit quantized channel information about candidate serving base stations to the transmitter. This feedback loop enables the transmitter to obtain interference information dynamically without requiring complex manual configuration, as the feedback process automatically adapts to changing base station and interference source configurations
Data Source
AI summary
A method for operating a terminal in a wireless communication system is provided. The method includes determining a candidate group of serving distributed small base stations and determining feedback bits for maximizing an expected average rate when a service is provided from a distributed small base station that belongs to the candidate group of serving distributed small base stations.