Private Network SIM Selection Under NID Collision
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Solution Overview
Problem
User equipment (UE) with multiple SIMs often experiences network identifier (NID) collisions due to shared PLMN IDs and NIDs, leading to unnecessary registration attempts and connectivity issues in private networks with overlapping coverage or proximity, as private networks frequently fail to assign unique NIDs.
Innovation Solution
Extend the Self-Organizing Network (SON) framework to enable UE to detect and report NID collisions by logging and transmitting NID collision information to the network, including location and time details, allowing the network to mitigate the issue by configuring new NIDs or using centrally-assigned identifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple SIMs share a common PLMN ID and NID in private networks, then device compatibility and network access flexibility are improved, but NID collision occurs leading to registration failures and network congestion
Solution Approach 1:
The UE performs preliminary detection of NID collisions by comparing the NID in the registration request with the NID stored in the SIM card before completing the registration process. This preliminary action allows the UE to identify potential collisions and take corrective measures, such as selecting an alternative SIM or notifying the network, thereby preventing registration failures caused by NID mismatches
Solution Approach 2:
The system implements a feedback mechanism where the UE detects NID collisions and communicates this information to the network. The network can then respond by providing alternative NIDs or adjusting its configuration. This feedback loop enables continuous improvement of network-SIM compatibility and reduces future collision incidents
2Reliability
If the UE attempts to register with multiple SIMs when NID collision is detected, then correct SIM selection may be achieved, but unnecessary registration attempts increase causing network congestion
Solution Approach 1:
The UE performs preliminary detection of NID collisions by comparing the NID in the registration request with the NID stored in the SIM card before completing the registration process. This preliminary action allows the UE to identify potential collisions and take corrective measures, such as selecting an alternative SIM or notifying the network, thereby preventing registration failures caused by NID mismatches
Solution Approach 2:
The UE dynamically adjusts its registration strategy based on the detection of NID collisions. When a collision is detected, the system transitions from a static registration attempt to a dynamic decision-making process that considers alternative SIMs or network notifications, optimizing the balance between achieving correct SIM selection and minimizing unnecessary network traffic
Data Source
AI summary
Techniques are directed toward network identification collision detection. An example method includes selecting a first subscriber identity module (SIM) associated with a public land mobile network identifier (PLMN ID) and a network identifier (NID) of a private network. The method can further include generating a first non-access stratum (NAS) registration request to establish a connection with the private network using the first SIM. The method can further include processing a NAS registration request reject message received from the private network. The method can further include selecting a second SIM associated with the PLMN ID and the NID. The method can further include generating a second NAS registration request to establish a connection with the private network using the second SIM. The method can further include processing a NAS registration request success message received from the private network. The method can further include logging NID collision information.