Encrypted Credential Verification for MCPTT Location Reporting

The patent introduces an encrypted credential verification mechanism as an intermediary layer between location information sharing and authorization control. The requesting UE includes an encrypted credential in the location information request message, and the requested UE verifies this credential before sharing location data. This intermediary verification process automates the authorization control, reducing manual complexity while maintaining security, thus enabling efficient location sharing for public safety services without proportionally increasing system complexity.

The patent applies preliminary action by pre-encrypting the credential with the requested UE's public key before inclusion in the location information request message. This encryption is performed in advance during the credential preparation phase, rather than encrypting the entire location data during the critical sharing moment. The requested UE then only needs to perform a single decryption operation using its private key, significantly reducing the processing time at the point of use while maintaining strong security and privacy protection for the location information.

The patent implements a dynamic location information update mechanism where the update frequency and method are adapted based on the specific service requirements and current conditions. The system supports multiple update modes including periodic updates, on-change updates, and event-triggered updates. The requesting UE can indicate its preferred update mode in the location information request message, and the requested UE adjusts its behavior accordingly. This dynamic approach ensures high location accuracy when needed while minimizing network traffic and energy consumption during stable conditions, resolving the contradiction between reliability and energy loss.