Common Feedback Channel Allocation in Wireless Systems
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Solution Overview
Problem
In wireless communication systems, the increasing number of terminals leads to a significant increase in feedback channels, resulting in overhead that hampers the system's ability to maximize multi-user diversity gain and cell capacity, especially when limited radio resources are available.
Innovation Solution
The method involves determining the minimum number of common feedback channels to be allocated to terminals based on capacity loss and generating feedback channel change information to adjust these channels, using a combination of common and separate control messages to transmit channel information efficiently, thereby optimizing feedback channel allocation and minimizing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of terminals increases in the wireless communication system, then the system can serve more users and maximize multi-user diversity gain, but the amount of feedback channels allocated to terminals increases, resulting in increased overhead
Solution Approach 1:
The patent merges feedback channels by allowing multiple terminals to share common feedback channels instead of allocating dedicated feedback channels to each terminal. The base station determines a common feedback channel that can be used by one or more terminals, thereby reducing the total number of feedback channels required in the system while still serving an increased number of terminals.
2Reliability
If dedicated feedback channels are allocated to each terminal, then each terminal can transmit its instantaneous channel information reliably, but the feedback overhead increases significantly as the number of terminals increases
Solution Approach 1:
The patent makes feedback channels universal by creating a common feedback channel that can be shared by multiple terminals. Instead of having dedicated feedback channels for each terminal, the system implements a universal feedback channel that serves multiple terminals, thereby reducing feedback overhead while maintaining the capability to transmit channel information reliably.
Solution Approach 2:
The patent implements dynamic feedback channel allocation where the base station determines which terminals can share common feedback channels based on current system conditions, terminal requirements, and capacity loss considerations. The allocation is not static but adapts to changing conditions, allowing the system to optimize the balance between reliability and overhead dynamically.
3Measurement precision
If more feedback channels are allocated to maintain reliability as terminals increase, then channel information can be transmitted accurately, but the limited radio resources are consumed by feedback overhead rather than data transmission
Solution Approach 1:
The patent applies partial action by allocating feedback channels only when necessary and only to the extent needed. Instead of providing full dedicated feedback channels to all terminals, the system provides common feedback channels to multiple terminals, using feedback resources partially rather than fully, thereby reducing radio resource consumption while maintaining sufficient channel information accuracy for scheduling decisions.
Data Source
AI summary
An apparatus and a method for allocating feedback channels in a wireless communication system are provided. The method includes determining a number of common feedback channels to be allocated commonly to one or more terminals using a capacity loss according to the feedback channel allocation; and generating feedback channel change information to change the number of the common feedback channels per terminal.