Adaptive Feedback Resource Allocation for Vehicular Terminals
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Solution Overview
Problem
In mobile telecommunication systems, particularly for vehicular mobile terminals, the high velocity leads to a short coherence time, resulting in excessive overhead for channel feedback information, and redundant feedback occurs even when channel quality is high, due to frequent scheduling challenges.
Innovation Solution
A communication method where a base station determines and transmits wireless resources to a target terminal based on its mobility information, including location, velocity, and signal light data, to optimize feedback intervals and reduce resource usage by adapting feedback wireless resources according to channel quality and traffic rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the channel feedback interval is shortened to adapt to high velocity vehicular terminals, then the channel quality tracking improves, but the overhead for channel feedback information increases excessively
Solution Approach 1:
The patent applies dynamics by making the feedback interval adaptive rather than fixed. The base station determines different feedback intervals for different terminals based on their mobility characteristics (velocity, location, moving direction) and channel conditions. This dynamic adjustment allows high-velocity vehicular terminals to have longer feedback intervals when channel conditions permit, reducing overhead while maintaining adequate channel quality tracking for terminals that require frequent updates.
Solution Approach 2:
The patent changes the parameter of feedback interval from a fixed value to a variable determined by multiple factors including terminal velocity, location, channel quality, and traffic rate. By adjusting this parameter based on actual system conditions, the patent optimizes the balance between channel quality tracking accuracy and feedback overhead, allowing the system to reduce overhead for high-velocity terminals without sacrificing necessary tracking precision.
2Reliability
If scheduling occurs frequently to maintain communication quality for high-velocity terminals, then the channel quality is maintained, but redundant feedback occurs even when channel quality is high
Solution Approach 1:
The patent implements an intelligent feedback mechanism where the base station determines feedback intervals based on terminal mobility information and channel conditions. Instead of frequent fixed-interval feedback, the system uses feedback only when necessary - when channel quality changes exceed thresholds or when mobility patterns indicate potential degradation. This selective feedback approach maintains communication reliability while eliminating redundant feedback transmissions for terminals with stable high-quality channels.
Solution Approach 2:
The patent applies partial action by implementing feedback only to the extent necessary for maintaining communication quality. Rather than requiring all terminals to feedback at maximum frequency, the system applies feedback selectively based on individual terminal needs - high-velocity terminals receive more frequent feedback requirements while low-velocity terminals with stable channels require less frequent feedback, reducing overall system redundancy while maintaining necessary reliability.
3Device complexity
If a fixed feedback interval is used for all terminals, then the system complexity is reduced, but the resource usage efficiency decreases for vehicular terminals with varying mobility
Solution Approach 1:
The patent segments the terminal population into different groups based on mobility characteristics (velocity, location, moving direction) and assigns different feedback intervals to different segments. Instead of a single fixed interval for all terminals, the system divides terminals into categories such as high-velocity vehicular terminals, low-velocity terminals, and stationary terminals, each receiving appropriate feedback interval configurations. This segmentation improves resource usage efficiency without significantly increasing system complexity, as the segmentation is based on readily available terminal information.
Data Source
AI summary
Provided is a communication method of a base station and a target terminal. Resources used for a channel feedback may be reduced by determining a wireless resource based on information about a channel and information about a mobility of the target terminal in each of at least one route, and by feeding back channel state information.