Ranging Key Fallback for UE Outside Network Coverage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In cellular mobile communication systems, when a user equipment (UE) is outside the coverage of a mobile communication network, it cannot update its discovery key, leading to a lack of integrity and security protection for ranging announcement messages, as the network cannot provide timely updates.
Innovation Solution
The UE determines a ranging integrity key and a ranging encryption key using long-term key information sent by the core network to ensure integrity and encryption protection of the ranging announcement message, even without a valid discovery key.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE uses discovery key for integrity and encryption protection of ranging announcement message, then the security protection is improved, but the UE cannot acquire discovery key from mobile communication network when outside network coverage
Solution Approach 1:
The patent introduces a fallback mechanism where the UE uses pre-stored key information (Kfallback) as an intermediary when the discovery key is unavailable. This allows the UE to maintain security protection for ranging announcement messages without requiring continuous network coverage, resolving the contradiction between security improvement and key acquisition capability.
Solution Approach 2:
The patent implements preliminary action by pre-storing key information in the UE before network disconnection occurs. This allows the UE to continue providing integrity and encryption protection using the pre-stored keys when outside network coverage, eliminating the dependency on real-time key acquisition from the network.
2Adaptability or versatility
If the UE operates outside mobile communication network coverage, then the UE mobility and flexibility are improved, but the integrity and security protection for ranging announcement messages deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-storing key information in the UE before network disconnection. This enables the UE to maintain security protection capabilities while operating outside network coverage, thus preserving both mobility and security protection without compromising either aspect.
Solution Approach 2:
The patent uses pre-stored key information as an intermediary mechanism that bridges the gap between UE mobility and security protection. This allows the UE to operate independently of network coverage while maintaining integrity and encryption protection through the fallback key mechanism.
Data Source
AI summary
The present disclosure relates to a method, apparatus, communication device, and storage medium for transmitting information. A first user equipment (UE) determines, according to long-term key information sent by a core network, an integrity protection key and a confidentiality protection key of a distance measurement announcement message, wherein the integrity protection key and the confidentiality protection key are respectively used for replacing, when the first UE cannot obtain a discovery key from a mobile communication network, the discovery key to perform integrity protection of the distance measurement announcement message and to perform confidentiality protection of predetermined confidential information in the distance measurement announcement message.