UE PLMN Selection Excluding Failed Networks
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Solution Overview
Problem
In wireless communication systems, User Equipment (UE) faces challenges in efficiently selecting and registering with Public Land Mobile Networks (PLMNs) for Proximity-based Service (ProSe) direct communication, particularly when initial registration fails, leading to inefficiencies and potential latency due to repeated attempts with previously failed PLMNs.
Innovation Solution
A method and apparatus for UE to select a first PLMN, register with it, and if registration fails, select a second PLMN, treating the first PLMN as excluded from the list, thereby avoiding repeated attempts with failed PLMNs and optimizing PLMN selection for ProSe direct communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the UE repeatedly attempts registration with the same PLMN after failure, then the UE maintains a simple selection process, but the registration success rate decreases and latency increases
Solution Approach 1:
The UE performs preliminary action by storing the failure cause information received from the network before attempting future registrations. When the stored cause indicates 'PLMN not allowed', the UE proactively excludes this PLMN from future selection, preventing repeated failed registration attempts and improving registration success rate while maintaining simple operation procedures.
2Productivity
If the UE remembers and excludes failed PLMNs from subsequent selection, then the registration efficiency improves, but the device complexity increases
Solution Approach 1:
The UE implements feedback by storing the cause information received from the network during failed registration attempts. This feedback mechanism allows the UE to automatically exclude PLMNs with 'PLMN not allowed' status from future selection, improving registration efficiency without significantly increasing device complexity since the logic leverages existing failure cause reporting mechanisms.
3Loss of time
If the UE excludes PLMNs with failure cause 'PLMN not allowed' from future selection, then the latency in finding a suitable PLMN decreases, but the loss of information about potentially recoverable PLMNs increases
Solution Approach 1:
The UE applies local quality by differentiating the treatment of different PLMNs based on their specific failure causes. Only PLMNs with 'PLMN not allowed' status are excluded from future selection, while other PLMNs remain in the selection pool. This selective exclusion approach reduces selection latency for problematic PLMNs while preserving information and opportunities for potentially recoverable PLMNs.
Data Source
AI summary
A method for a User Equipment (UE) in a wireless communication system, the includes transmitting, by the UE which is outside of coverage, a first message for registration to a first cell on a selected first Public Land Mobile Network (PLMN), wherein the first PLMN which is not included in a list related to forbidden PLMNs; receiving, by the UE, a second message related to registration failure with the first PLMN; selecting, by the UE, a second PLMN; and transmitting, by the UE, a third message for registration to a second cell on the selected second PLMN, wherein zero or more PLMNs, which are included in the list related to forbidden PLMNs, are excluded in a selection of the second PLMN, and wherein the first PLMN with which the registration has failed is further excluded in the selection of the second PLMN, although the first PLMN is not included in the list related to forbidden PLMNs.