Roaming PLMN List Update for Reliable Network Reselection
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing and updating the list of prioritized operator-controlled Public Land Mobile Networks (PLMNs) on user equipment devices, particularly in scenarios where network registration is aborted, leading to suboptimal roaming and service continuity.
Innovation Solution
A user equipment device is configured to receive a steering of roaming (SoR) container that includes a list of operator preferred PLMNs, allowing it to replace the existing PLMN list on the USIM with a prioritized list, manage an SoR aborted list, and perform high-priority PLMN selection based on mobile country codes, ensuring seamless network reselection and service continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE replaces the existing PLMN list on the USIM with the received SoR container list, then the roaming efficiency is improved, but the risk of losing original operator-preferred networks is increased
Solution Approach 1:
The UE performs a backup of the existing PLMN list from the USIM to the device memory before replacing it with the received SoR container list. This preliminary action ensures that the original operator-preferred networks are preserved and can be restored if needed, thus resolving the contradiction between improving roaming efficiency and maintaining network selection reliability.
2Duration of action of stationary object
If the UE stores the received SoR container list in memory, then the service continuity is improved, but the memory resource consumption is increased
Solution Approach 1:
The UE creates a copy of the PLMN list from the USIM and stores it in the device memory rather than storing the entire SoR container data. This copying approach allows the UE to maintain service continuity by having the PLMN list readily available in memory while minimizing memory resource consumption by only storing the essential list data rather than the complete container.
3Measurement precision
If the UE performs a complete PLMN list update from the SoR container, then the roaming accuracy is improved, but the time required for network reselection is increased
Solution Approach 1:
The UE segments the PLMN list update process by first backing up the existing list, then selectively updating only the necessary portions with data from the SoR container, rather than performing a complete replacement. This segmentation approach maintains roaming accuracy by ensuring proper list updates while reducing network reselection time by avoiding unnecessary full-list processing.
Data Source
Figure 1A~1B
Figure 2
Figure 3~4
AI summary
Apparatuses, systems, and methods for SoR list management and PLMN selection based on an SoR list. A UE may receive an SoR container which may include a list of OPLMNs. The UE may store a prior list of OPLMNs stored on a USIM of the UE on a memory of the UE. The UE replace the prior list of OPLMNs stored on the USIM with the list of OPLMNs included in the SoR container. The UE may consider the prior list of OPLMNs as a lower priority list as compared to the list of OPLMNs stored on the USIM. Additionally, in response to determining to move from a current PLMN, the UE may scan for a new PLMN based on the list of OPLMNs stored on the USIM.