PLMN Selection Using SOR-SENSE for Stationary Wireless Terminals
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Solution Overview
Problem
Existing wireless communication systems lack efficient methods for signal level-based network selection and determination of terminal mobility in a wireless communication system, particularly for stationary terminals.
Innovation Solution
A method and apparatus for performing signal level-based network selection in wireless communication systems, involving a terminal that receives SOR-SENSE information from an access management function (AMF) of a first network, determining the applicability of SENSE, and selecting a public land mobile network (PLMN) based on signal thresholds or priority orders depending on SENSE applicability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional PLMN selection based on priority order is used, then network selection simplicity is maintained, but network selection efficiency and communication reliability are insufficient for stationary terminals
Solution Approach 1:
The patent introduces signal level parameters (signal threshold, signal quality metrics) as additional criteria for PLMN selection beyond the traditional priority order. The terminal determines SENSE applicability and switches between priority-based selection and signal-level-based selection based on terminal mobility status, thereby improving communication reliability for stationary terminals while maintaining simplicity for mobile terminals.
2Reliability
If signal level-based network selection (SENSE) is applied to all terminals, then communication reliability is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent implements dynamic adaptation by determining terminal mobility status (stationary or mobile) and dynamically selecting the appropriate PLMN selection method. For stationary terminals, SENSE with signal level criteria is applied to improve reliability. For mobile terminals, the traditional priority order method is maintained to avoid unnecessary complexity. This dynamic approach ensures that the system adapts its complexity to the actual needs of different terminal types.
3Measurement precision
If SENSE information is transmitted through multiple network functions (UDM to AMF to terminal), then network selection accuracy is improved, but information transmission overhead and processing time increase
Solution Approach 1:
The patent implements preliminary determination of SENSE applicability by the terminal based on its mobility status before initiating the full SENSE information exchange. The terminal determines whether it is a stationary terminal and only then requests and processes SENSE information from the network. This preliminary filtering reduces unnecessary information transmission and processing for mobile terminals that do not benefit from SENSE, thereby reducing time loss while maintaining accurate network selection for stationary terminals.
Data Source
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AI summary
The present disclosure relates to selecting a public land mobile network (PLMN) in a wireless communication system, and a method performed by a terminal may include transmitting a registration request message, receiving a registration accept message including steering of roaming (SOR)-signal level enhanced network selection (SENSE) information from an access management function (AMF) of a first network, wherein the AMF of the first network receives the SOR-SENSE information from a unified data management (UDM) of a second network, transmitting a registration complete message, determining whether or not SENSE is applicable based on the SOR-SENSE information, and performing public land mobile network (PLMN) selection based on whether or not the SENSE is applicable.