Wireless Resource Block Mapping Overhead Reduction
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Solution Overview
Problem
Conventional resource block mapping in wireless communication systems results in high overhead, which reduces frequency selectivity and increases decoding complexity, as it requires a large number of bits to be transmitted in the downlink shared control channel.
Innovation Solution
The proposed solution reduces overhead by using a unique subscriber station identification (SS ID) for each SS, allowing fewer bits to be transmitted in the resource block map, and employing a shared RB mapping channel that uses SS IDs to assign RBs, thereby reducing the number of bits needed for decoding and maintaining frequency selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If conventional resource block mapping is used with individual RB maps for each SS, then complete RB assignment information is provided to each SS, but the overhead increases significantly and frequency selectivity is reduced
Solution Approach 1:
The patent merges individual RB maps for multiple SSs into a single shared RB map transmitted on the downlink shared control channel. Instead of transmitting separate 100-bit RB maps to each of five SSs (500 bits total), a single shared RB map is transmitted that all SSs can access, dramatically reducing the total number of bits required while maintaining complete RB assignment information for each SS.
Solution Approach 2:
The shared RB map serves multiple SSs simultaneously, making it a universal data structure that provides RB assignment information for multiple subscribers. Each SS uses its unique SS ID to identify and extract its specific RB assignments from the shared map, allowing one RB map to fulfill the function of multiple individual RB maps.
2Reliability
If conventional RB mapping with individual RB maps per SS is used, then each SS receives complete scheduling information, but decoding complexity increases
Solution Approach 1:
The patent segments the large shared RB map into individual SS-specific RB assignments by using SS IDs as indices. Each SS extracts only its relevant RB assignment information from the shared map by locating entries corresponding to its SS ID, reducing the amount of data each SS must process and decode compared to receiving a complete individual RB map.
Solution Approach 2:
The SS ID acts as an intermediary that links each SS to its specific RB assignments within the shared RB map. Instead of each SS receiving and decoding a complete individual RB map, the SS ID enables each SS to efficiently locate and extract only its relevant assignment information from the shared structure, reducing decoding complexity while maintaining accuracy.
3Quantity of substance
If the number of RB mapping bits is reduced to lower overhead, then fewer bits are transmitted, but frequency selectivity is lost
Solution Approach 1:
The patent transitions from a one-to-one mapping (individual RB maps per SS) to a many-to-one mapping (shared RB map serving multiple SSs). This dimensional change in the data structure allows the system to maintain complete frequency-selective RB assignment information for each SS while transmitting a single shared RB map, effectively reducing overhead without sacrificing frequency selectivity.
Data Source
AI summary
A technique of operating a wireless communication device includes creating a resource block map by associating respective subscriber station identifications, corresponding to respective subscriber stations, with one or more resource blocks. The respective subscriber station identifications and the resource block map are transmitted, from a serving base station, in one or more control channel symbols.