Sub-Map Generation for Wireless MAP Information Transmission
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Solution Overview
Problem
Conventional communication systems incur unnecessary overhead by applying the same coding and modulation schemes for all mobile stations, including those near the cell boundary, to ensure error-free reception of MAP information, leading to inefficient resource usage.
Innovation Solution
The system generates and transmits sub-MAPs tailored to individual mobile stations based on their channel quality, using distinct coding, modulation, and repetition schemes, allowing for optimized resource allocation and reduced overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the BS applies the same coding scheme, modulation scheme and repetition scheme for all mobile stations to ensure error-free reception of MAP information, then the reliability of MAP information reception is improved for cell boundary mobile stations, but the system overhead increases unnecessarily for non-cell boundary mobile stations
Solution Approach 1:
The patent divides the single MAP information into multiple sub-MAPs, each tailored to specific mobile station groups based on channel quality. This segmentation allows different coding schemes, modulation schemes, and repetition schemes to be applied to different sub-MAPs, thereby reducing overall system overhead while maintaining reliability for cell boundary stations.
Solution Approach 2:
The patent applies different transmission parameters (coding scheme, modulation scheme, repetition scheme) to different sub-MAPs based on the channel quality of target mobile stations. This local quality approach ensures that cell boundary mobile stations receive robust transmission while non-cell boundary mobile stations receive optimized transmission with reduced overhead.
2Reliability
If the BS uses low modulation order and low coding rate with repetition to ensure cell boundary mobile stations can receive MAP information, then the reliability is improved, but the transmission efficiency and resource utilization deteriorate
Solution Approach 1:
By segmenting MAP information into sub-MAPs targeted at different mobile station groups, the system can apply aggressive repetition and low-order modulation only to sub-MAPs intended for cell boundary stations, while using higher-order modulation and fewer repetitions for sub-MAPs intended for non-cell boundary stations, thereby improving overall transmission efficiency.
Solution Approach 2:
The patent dynamically changes transmission parameters (modulation order, coding rate, repetition count) based on the channel quality information of mobile stations. This allows the system to optimize transmission efficiency by using higher modulation orders and lower repetition counts for stations with good channel conditions, while maintaining reliability for stations with poor channel conditions.
Data Source
AI summary
A method and apparatus for transmitting and receiving MAP information in a communication system are provided. A base station acquires channel quality information of each mobile station, generates sub-MAPs using MAP information, to which at least one of a coding scheme, a modulation scheme and a repetition scheme is applied, separately for each mobile station according to the channel quality information, and transmits the generated sub-MAPs. A mobile station receives MAP information from the base station, detects a sub-MAP allocated to the mobile station from the received MAP information, and restores the detected sub-MAP to MAP information using at least one of a corresponding decoding scheme, demodulation scheme and repetition scheme corresponding to coding scheme, modulation scheme and repetition scheme applied in the base station, based on channel quality information of the mobile station. Accordingly, system overhead can be reduced.