Cell Selection Across Third-Party Networks Using 5G-S-TMSI
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Solution Overview
Problem
Existing mobile communication technologies limit terminal devices to communicate only with subscribed networks, restricting network deployment and communication flexibility.
Innovation Solution
A method and apparatus that enable terminal devices to identify and select cells belonging to third-party networks by using configuration information, allowing cell selection or reselection based on third-party network criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the terminal device only accesses cells matching the subscribed network identity, then network security and subscription compliance are ensured, but network deployment flexibility and communication versatility are limited
Solution Approach 1:
The network identity verification is segmented into multiple levels: PLMN identity matching for subscribed networks, and 5G-S-TMSI based verification for third-party networks. This segmentation allows the terminal to differently handle connected networks versus non-connected networks, enabling both subscription compliance and network deployment flexibility.
Solution Approach 2:
The cell determination method is designed to universally handle multiple network types: it can determine cells belonging to subscribed networks using traditional PLMN matching, and simultaneously determine cells belonging to third-party networks using 5G-S-TMSI matching. This multi-functionality resolves the contradiction by making the terminal adaptable to both subscribed and non-subscribed network scenarios.
2Adaptability or versatility
If the terminal device compares network identity with subscribed network identity, then network access security is maintained, but communication scope and network selection freedom are restricted
Solution Approach 1:
The terminal device performs preliminary actions by maintaining both PLMN identity information and 5G-S-TMSI information in advance. When cell determination is needed, it can quickly switch between different verification methods based on whether the cell belongs to a subscribed or third-party network, avoiding complex real-time decision-making and reducing processing complexity.
Solution Approach 2:
The 5G-S-TMSI acts as an intermediary identifier that bridges the terminal and third-party networks. Instead of requiring direct PLMN identity matching for all networks, the 5G-S-TMSI enables indirect verification for third-party networks, expanding communication scope while maintaining a manageable verification process.
3Adaptability or versatility
If the terminal device uses traditional PLMN identity matching, then network access control is precise, but support for non-subscribed networks and emerging network types is insufficient
Solution Approach 1:
The network identification mechanism is made dynamic by allowing the terminal to switch between PLMN-based identification for subscribed networks and 5G-S-TMSI-based identification for third-party networks. This dynamic approach enables precise identification appropriate to each network type while supporting diverse network scenarios including traditional mobile networks and emerging non-public networks.
Solution Approach 2:
The identification parameters are changed from solely relying on PLMN identity to using both PLMN identity and 5G-S-TMSI depending on the network context. This parameter change enables the system to maintain high identification accuracy for subscribed networks while simultaneously gaining the ability to identify and access third-party networks with different identification mechanisms.
Data Source
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AI summary
The present disclosure relates to the field of mobile communications. Disclosed are a cell determining method and apparatus, a device, and a storage medium. The method comprises: obtaining a cell by means of searching; if the cell is determined to belong to a third-party network, determining the cell as a target cell, wherein the third-party network is another network other than a subscribed network of a terminal device, and the target cell is used for cell selection or cell reselection by the terminal device. The deployment type of a communication network is expanded. The restriction that a terminal device can only perform communication on the basis of a subscription party network is broken, the manner in which the terminal device performs communication on the basis of the communication network is expanded, and the communication quality of the terminal device for communication is improved.