UE PLMN Reselection After Forbidden List Entry Removal
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Solution Overview
Problem
There is no defined action or behavior in the 3GPP system for User Equipment (UE) regarding PLMN list handling after the removal or deletion of PLMNs not allowed to operate at the present UE location, especially when the UE is in a limited service state.
Innovation Solution
A method and UE are provided for PLMN search and selection after the removal of candidate PLMNs, involving identifying a limited service state, detecting the removal of PLMN entries, and triggering PLMN selection only when the UE is in a limited service state, based on conditions such as successful registration, timer expiration, or geographical location changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continuously monitors and attempts PLMN selection after entry removal, then the UE can quickly recover service, but the UE wastes time and energy in normal service states
Solution Approach 1:
The patent applies parameter changes by monitoring the UE's service state (limited service state vs. normal service state) and changing the PLMN selection behavior accordingly. When in limited service state, the UE triggers PLMN search and selection after entry removal; when in normal service state, the UE does not trigger PLMN search and selection, thus adapting the action based on the service state parameter.
Solution Approach 2:
The patent implements self-service by having the UE autonomously determine whether to trigger PLMN search and selection based on its own service state. The UE monitors its state and makes the decision to initiate or skip PLMN selection procedures without external intervention, optimizing resource usage based on its current operational status.
2Adaptability or versatility
If the UE triggers PLMN search and selection after every entry removal, then the UE ensures optimal network selection, but the UE performs unnecessary actions in normal service states
Solution Approach 1:
The patent changes the behavior parameter based on the service state parameter. The UE monitors whether it is in limited service state or normal service state and adjusts the PLMN selection behavior accordingly - triggering the full PLMN search and selection process only when necessary (limited service state), thereby reducing complexity when not needed.
Solution Approach 2:
The patent introduces dynamics by making the PLMN list handling process adaptive and flexible rather than static. The UE dynamically adjusts its behavior based on changing service states, transitioning between active PLMN selection mode (when in limited service state) and passive mode (when in normal service state), thus optimizing complexity based on operational needs.
3Productivity
If the UE does not trigger PLMN search and selection after entry removal, then the UE avoids unnecessary actions, but the UE may lose service opportunity when needed
Solution Approach 1:
The patent uses parameter changes by monitoring the service state parameter and changing the PLMN selection action accordingly. When the UE is in limited service state, it triggers PLMN search and selection to maintain service continuity; when in normal service state, it skips the process to maintain efficiency, thus optimizing both productivity and reliability based on the service state parameter.
Solution Approach 2:
The patent implements feedback by having the UE continuously monitor its service state and use this feedback information to determine whether to trigger PLMN search and selection. The UE's service state serves as feedback that guides its behavior, ensuring it acts only when necessary to maintain service continuity while avoiding unnecessary actions during normal operation.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Embodiments herein provide a method for PLMN search and selection after removal of a candidate PLMN in a wireless network by a UE. The method includes identifying that the UE is in a limited service state. Further, the method includes identifying that an entry of at least one candidate public land mobile network (PLMN) from a list of PLMNs not allowed to operate at a current location of the UE is removed. Further, the method includes triggering a PLMN selection in case that the entry is removed from the list of PLMNs and the UE is in the limited service state.