Selective Cooperative Relaying for Cellular Throughput and Outage Trade-offs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cooperative relaying schemes face limitations in service outage performance and throughput due to inefficient resource allocation and interference, particularly in cellular systems where simple relaying schemes increase system volume but lead to higher service outages, and cooperative transmission diversity schemes consume additional resources.
Innovation Solution
A selective cooperative relaying method and system that adaptively selects between direct transmission, simple relaying, cooperative transmission diversity, and cooperative receiving diversity schemes based on channel quality measurements and resource allocation, calculating an equivalent burst transmission rate to optimize resource usage and minimize service outages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If simple relaying scheme is used to increase system volume, then throughput increases, but service outage rate increases due to high-efficient modulation and interference between cells
Solution Approach 1:
The patent implements dynamic selection between simple relaying scheme and cooperative receiving diversity scheme based on real-time channel conditions. The base station determines which scheme to use by evaluating channel quality indicators, allowing the system to adaptively switch between throughput-optimized and reliability-optimized modes, thereby resolving the contradiction between high throughput and low service outage rate
Solution Approach 2:
The patent changes the operational parameters of the relaying system by introducing cooperative receiving diversity as an alternative mode. This involves modifying the resource allocation strategy where the base station allocates resources for both direct transmission to mobile station and cooperative transmission to relay station, changing the transmission parameters dynamically based on channel conditions to balance throughput and service outage performance
2Reliability
If cooperative transmission diversity scheme is used to acquire diversity gain, then service outage performance improves, but band efficiency decreases due to additional resource allocation
Solution Approach 1:
The patent makes the cooperative transmission diversity scheme dynamic by implementing conditional execution based on channel conditions. The base station evaluates channel quality and only activates cooperative transmission when it provides net benefit, otherwise defaults to simple relaying or direct transmission. This dynamic approach ensures diversity gain is obtained only when necessary, maintaining band efficiency while improving service outage performance when needed
Solution Approach 2:
The patent applies partial cooperative transmission diversity by selectively activating it only for specific mobile stations or specific time periods when channel conditions warrant it, rather than applying it universally. This partial application reduces the overall resource overhead while still providing diversity gain where needed, balancing service outage performance improvement with band efficiency preservation
3Productivity
If cooperative receiving diversity scheme is used to avoid additional resource allocation, then band efficiency improves, but additional processes are required for resource allocation information reporting
Solution Approach 1:
The patent implements self-service by having the mobile station autonomously determine and report channel quality indicators without requiring complex coordination protocols. The mobile station independently evaluates the channel conditions and provides feedback to the base station, which then autonomously decides on the transmission scheme. This self-service approach minimizes the need for additional complex reporting processes while maintaining band efficiency
Solution Approach 2:
The patent establishes a feedback mechanism where the mobile station reports channel quality indicators to the base station, and the base station uses this feedback to determine the appropriate transmission scheme. This feedback loop enables the system to achieve cooperative receiving diversity with minimal additional processes, as the feedback provides sufficient information for the base station to make optimal decisions without requiring complex coordination protocols
Data Source
AI summary
A selective cooperative relaying method, the method including: determining, by a base station, whether a mobile station for which the base station provides a service is the mobile station necessary for direct transmission or is the mobile station necessary for cooperative relaying via a relay station; and selecting, by a base station, mobile stations using a simple relaying scheme, a cooperative transmission diversity scheme, or a cooperative receiving diversity scheme from mobile stations necessary for the cooperative relaying via the relay station.