Relay-Enhanced Cellular System for Cell Border Throughput
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Solution Overview
Problem
Current cellular radio communications systems face challenges in maintaining consistent end-to-end throughput and spectral efficiency, particularly at the cell border, due to the decrease in Carrier-to-Interference (C/I) power ratio as mobile stations move further from the base station, leading to unfair transmission rate assignment and reduced spectral efficiency.
Innovation Solution
Deploying a cellular wide-area radio communications system with a higher average number of multi-hop data transmissions, utilizing relay stations to enhance coverage and reduce the burden on base stations, thereby increasing end-to-end throughput and spectral efficiency by equalizing the C/I ratio across the coverage area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If base stations are placed in a substantially regular arrangement with centered positions in the middle of cells, then coverage area is maximized and system structure is simplified, but the Carrier-to-Interference (C/I) power ratio decreases towards the cell border and end-to-end throughput declines
Solution Approach 1:
The patent divides a large cell into multiple smaller sub-cells by deploying relay stations at strategic locations within the cell. Each sub-cell is served by a relay station, effectively segmenting the coverage area. This segmentation allows mobile stations in previously poor coverage areas (cell borders) to connect to nearby relay stations rather than distant base stations, thereby maintaining higher C/I ratios throughout the entire coverage area while preserving the overall cell structure.
2Reliability
If transmission power is increased to maintain throughput at cell border, then end-to-end throughput is improved, but spectral efficiency is substantially reduced
Solution Approach 1:
The patent applies local quality by deploying relay stations specifically at locations where coverage quality is poor (such as cell borders and remote areas), rather than uniformly increasing power across the entire system. Each relay station provides enhanced local coverage to its surrounding sub-cell, allowing mobile stations in those specific locations to achieve adequate throughput without requiring other users to tolerate reduced spectral efficiency from omnidirectional power increases.
3Reliability
If relay stations are deployed to enhance coverage and equalize C/I ratio, then end-to-end throughput is improved, but system complexity increases due to multi-hop transmissions
Solution Approach 1:
The patent introduces relay stations as intermediary nodes between base stations and mobile stations. These relay stations simplify the overall system architecture by creating a hierarchical structure where relay stations handle local coordination and transmission within their sub-cells, while base stations manage broader network functions. This intermediary layer reduces the complexity burden on individual base stations and enables more manageable multi-hop transmission protocols compared to direct base station-to-mobile station connections across large distances.
4Productivity
If mobile stations are served directly by base stations, then transmission path is simple and latency is low, but throughput is insufficient for mobile stations located far from base station
Solution Approach 1:
The patent adds a spatial dimension to the transmission architecture by deploying relay stations at intermediate locations between base stations and remote mobile stations. This creates a multi-dimensional transmission path where signals can route through intermediate nodes rather than traveling directly across large distances. The additional spatial dimension (relay stations positioned strategically within cells) enables throughput improvement for distant mobile stations while managing complexity through localized sub-cell management.
Data Source
AI summary
In a cellular wide-area radio communications system, comprising a plurality of base stations, a plurality of relay stations, and a plurality of mobile stations, wherein each of the relay stations is associated with at least one of the base stations, each of the mobile stations is associated with at least one of the base stations or one of the relay stations, wireless data transmissions between mobile stations and base stations take place either as single-hop data transmissions between the mobile stations and their associated base stations, or as multi-hop data transmissions between the mobile stations and their associated relay stations and a data transmission between the relay stations and the base stations associated with the relay stations, wherein an average number of multi-hop data transmissions in the radio communications system equals at least an average number of single-hop data transmissions.