Paging Group Identifier Segmentation for Mobile Relay Station Coverage
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Solution Overview
Problem
In wireless communication systems, mobile stations (MS) experience frequent location updates due to the momentary presence of mobile relay stations (MRS), leading to increased battery power consumption and radio resource wastage, especially when MRSs hand over into and out of a base station's coverage area.
Innovation Solution
The implementation of Primary, Secondary, and Ternary Paging Group Identifiers (PGIDs) in the broadcast configuration information of MRSs and base stations, which reduces the frequency of MS location updates by managing changes in supported PGIDs and deterring MS selection of an MRS unless joined, thereby minimizing configuration updates and maintaining the idle/sleep cycle of MSs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If mobile relay stations are deployed to extend coverage and support higher data rates, then network coverage and data rate capability are improved, but frequent location updates occur when MRS move in and out of coverage areas, increasing battery power consumption and radio resource wastage
Solution Approach 1:
The patent segments the paging group identification into multiple levels: primary PGID for the base station and secondary PGIDs for relay stations. This segmentation allows MS to distinguish between BS and MRS coverage areas, enabling smarter location update decisions that reduce unnecessary updates when MRS move in and out of coverage, thereby reducing battery power consumption while maintaining extended coverage capability
Solution Approach 2:
The patent introduces an intermediary mechanism where the base station acts as a coordinator between the network and mobile stations. The BS manages the secondary PGIDs for MRS and provides this information to MS, enabling MS to make informed decisions about location updates without directly interacting with moving MRS, thus reducing unnecessary location updates and radio resource wastage
2Measurement precision
If mobile stations update location frequently to track mobile relay stations, then location accuracy is improved, but battery power consumption and radio resource usage increase
Solution Approach 1:
The patent applies local quality by making location update behavior context-dependent rather than uniform. MS uses different update strategies based on local conditions: it updates location when moving between BS coverage areas (primary PGID changes) but avoids unnecessary updates when MRS move within their parent BS's coverage (secondary PGID changes). This localized adaptation maintains location tracking accuracy where needed while conserving battery power where unnecessary updates would occur
3Speed
If mobile stations monitor and update location for every mobile relay station movement, then network responsiveness is improved, but radio resource wastage increases
Solution Approach 1:
The patent introduces dynamics by making the location update mechanism adaptive rather than static. MS dynamically adjusts its location update behavior based on the mobility characteristics of MRS and the stability of paging group assignments. When MRS move frequently within a BS's coverage, MS reduces update frequency while maintaining awareness through the hierarchical PGID structure, thus reducing radio resource wastage while preserving necessary network responsiveness
Data Source
AI summary
A wireless communications network includes a base station and a number of mobile relay stations. Each mobile relay station within an area of coverage for the base station has associated with it a unique paging group identification value as well as the paging group identification value of the base station.