EPLMN List Management in Mobile Terminals
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Solution Overview
Problem
Mobile terminals face challenges in performing accurate Public Land Mobile Network (PLMN) selection and cell selection due to inconsistencies in the Equivalent PLMN (EPLMN) list, leading to potential failures in network operations and increased power consumption.
Innovation Solution
A method and apparatus for managing the EPLMN list in mobile terminals, which involves receiving messages from the network, determining the presence of an EPLMN list, and maintaining or updating the stored list to ensure accurate PLMN selection and cell selection by comparing PLMN identifiers and entries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile terminal updates the EPLMN list whenever a message is received from the network, then the EPLMN list is kept updated, but the mobile terminal may fail to perform accurate PLMN selection or cell selection due to inconsistencies in the received messages
Solution Approach 1:
The mobile terminal performs preliminary validation of received EPLMN list messages against previously stored valid EPLMN information before updating. This preliminary check prevents inconsistent or incorrect EPLMN data from overwriting the stored list, ensuring that updates only occur when the received message is verified to be accurate and consistent with network information.
2Reliability
If the mobile terminal continuously monitors and updates the EPLMN list, then the PLMN selection accuracy is improved, but the power consumption increases
Solution Approach 1:
Instead of continuously monitoring and updating the EPLMN list, the mobile terminal adopts periodic action by only updating the EPLMN list when specific triggering events occur, such as receiving a location update accept message or attach accept message from the network. This periodic update approach maintains PLMN selection accuracy while significantly reducing power consumption compared to continuous monitoring.
3Loss of information
If the mobile terminal updates the EPLMN list with every received message, then the latest network information is obtained, but the service initiation time is delayed due to processing overhead
Solution Approach 1:
The mobile terminal performs preliminary validation of received EPLMN list messages against previously stored valid EPLMN information before updating. This preliminary check prevents unnecessary updates when the received message contains redundant or inconsistent information, reducing processing overhead and enabling faster service initiation while still obtaining fresh network information when actually needed.
Data Source
AI summary
An apparatus and method for Equivalent Public Land Mobile Network (EPLMN) list management in a mobile terminal are provided. The method includes receiving a message from a network after storing an EPLMN list having at least one PLMN entry, determining whether an EPLMN list is present in the received message, and performing EPLMN list management by maintaining, when an EPLMN list is not present in the received message, the stored EPLMN list. As a result, the mobile terminal may retain an accurate EPLMN list and efficiently perform cell selection/reselection.