Relay Station Selection in Multihop Communication Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 4G mobile communication systems, existing multihop relay schemes lack an efficient method for mobile stations (MS) to select the optimal Relay Station (RS) to enhance system capacity and extend cell coverage, especially when channel states are poor.
Innovation Solution
The MS receives RS information from the serving Base Station (BS), measures the reference signal strength of indicated RSs, and selects a target RS for relaying signals when the measured strength meets a condition, using RS-INFO messages that include identifier and preamble index information to facilitate optimal relay selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an MS uses conventional multihop relay schemes to extend cell coverage or increase system capacity, then the service coverage and system capacity are improved, but there is no efficient method for the MS to select the optimal Relay Station, resulting in suboptimal performance
Solution Approach 1:
The serving base station performs preliminary actions by detecting the number of relay stations and generating RS-INFO messages containing identifier and preamble index information before the mobile station needs to select a relay station. This pre-prepared information enables the mobile station to efficiently measure reference signal strength and select the optimal relay station without complex real-time decision-making processes.
2Productivity
If the MS selects an RS to increase system capacity, then more users can be served simultaneously, but the complexity of RS selection and measurement increases
Solution Approach 1:
The serving base station acts as an intermediary by detecting relay station information and providing processed RS-INFO messages to the mobile station. This intermediary role simplifies the mobile station's task, as it only needs to measure reference signal strength of indicated relay stations and select based on predefined conditions, rather than performing complex autonomous selection among all possible relay stations.
3Reliability
If the MS measures reference signal strength of multiple RSs to ensure optimal selection, then the reliability of connection is improved, but the measurement time and processing overhead increase
Solution Approach 1:
The serving base station extracts and provides only the necessary relay station information (identifier and preamble index) that the mobile station needs for measurement. This selective information provision allows the mobile station to focus measurements on specific indicated relay stations rather than all possible relay stations, reducing measurement time while maintaining connection reliability through targeted signal strength assessment.
Data Source
AI summary
A method and apparatus for selecting a Relay Station (RS) for a Mobile Station (MS) of a communication system are provided. The communication system is provided with the MS, a serving Base Station (BS) for providing the MS with a service and RSs for relaying signals of the MS and the BS. The MS receives RS information for increasing system capacity from the serving BS, measures reference signal strength of an RS indicated in the RS information, and selects an associated RS as a target RS for relaying a signal when the measured reference signal strength satisfies a condition.