Steering of Roaming Integrity via MAC-I Verification
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Solution Overview
Problem
Current technologies face challenges in ensuring the integrity and acknowledgment of Steering of Roaming (SoR) information during registration rejects, particularly in maintaining data integrity and ensuring proper acknowledgment mechanisms, which can lead to issues with network trust and user equipment (UE) registration processes.
Innovation Solution
The proposed solution involves transmitting a registration request with an indication of SoR update support to an Access and Mobility Management Function (AMF), receiving a registration reject message including SoR information and a Message Authentication Code-Integrity (MAC-I) from the home network, and using this information to verify the integrity of the SoR data and send a proper acknowledgment, ensuring secure and reliable SoR updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SoR information is transmitted during registration reject, then roaming steering capability is improved, but data integrity and acknowledgment reliability deteriorate
Solution Approach 1:
The patent introduces an intermediary acknowledgment mechanism where the UE sends a separate acknowledgment message to confirm receipt and integrity of SoR information. This mediator (ACK message) bridges the gap between transmitting SoR data and ensuring its reliable delivery, allowing the system to maintain both roaming steering capability and data integrity.
Solution Approach 2:
The patent implements a feedback loop where the UE acknowledges receipt of SoR information by sending an acknowledgment message back to the network. This feedback mechanism allows the network to verify successful delivery and integrity of steering information, resolving the contradiction between transmitting SoR data and ensuring its reliable delivery.
2Reliability
If MAC-I is included in registration reject message, then data protection is improved, but message complexity increases
Solution Approach 1:
The patent combines the MAC-I integrity protection mechanism with the existing registration reject message structure. By merging these functions into a single integrated message rather than separate transmissions, the system achieves data protection while minimizing the increase in message complexity.
Data Source
AI summary
Embodiments of the present disclosure relate to devices, methods, apparatuses and computer readable storage media of Steering of Roaming (SoR) enhancement during registration reject. The method comprises transmitting, from a terminal device to an AMF, a registration request at least indicating that a SoR update is supported in a registration reject message, the AMF being associated with a VPLMN on which the terminal device intends to camp; and receiving the registration reject message including a request of acknowledgement, SoR information and a MAC-I of a home network.