PC5 Relay Security Policy Alignment for Consistent D2D Links
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Solution Overview
Problem
In device-to-device (D2D) communication scenarios where a terminal device is out of network coverage or has poor network communication quality, ensuring consistent and secure processing of user plane data across links through a relay is challenging.
Innovation Solution
Implementing a method where terminal devices and relays synchronize user plane and control plane security protection methods across PC5 links to ensure consistency and reduce error probabilities by activating or disabling integrity and confidentiality protections uniformly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If security protection methods are independently configured on each link, then flexibility in security policy implementation is improved, but consistency of security protection across links deteriorates
Solution Approach 1:
The patent merges security policy configuration for multiple links into a unified process. The relay device obtains security policies for both the first PC5 link and second PC5 link, then determines and activates security protection methods that ensure consistency across both links simultaneously, rather than configuring each link independently.
Solution Approach 2:
The patent enforces homogeneity in security protection methods across different links. By requiring that the same security protection method be activated on both the first PC5 link and second PC5 link, the patent ensures uniform security handling throughout the relay communication path, preventing inconsistencies that would arise from independent configuration.
2Reliability
If security protection is activated on all links, then security level is improved, but device complexity and processing overhead worsen
Solution Approach 1:
The patent applies partial action by selectively activating security protection methods based on actual requirements. Instead of mandating security on all possible links, the system determines appropriate security protection methods for each specific link based on the obtained security policies, activating security only where necessary and at appropriate levels.
Solution Approach 2:
The patent implements dynamic security configuration where the relay device adaptively determines security protection methods for different links based on obtained security policies. The security activation is not static but dynamically adjusted according to the specific requirements of each communication link and the policies received from terminal devices.
3Adaptability or versatility
If different security protection methods are used on different links, then adaptability to varying security requirements is improved, but error probability in security processing worsens
Solution Approach 1:
The patent applies local quality by allowing different security protection methods to be determined for different links based on their specific requirements. Each link can have its security policy customized according to local needs while maintaining overall system consistency through the coordinated determination process at the relay device.
Data Source
AI summary
A secure communication method includes a second terminal device that receives a first request message about a first terminal device from a relay, the first request message includes a PC5 user plane security policy of the first terminal device and a PC5 user plane security policy of the relay; determines first information according to a PC5 user plane security policy of the second terminal device, the PC5 user plane security policy of the first terminal device, and the PC5 user plane security policy of the relay; and sends the first information to the relay, the first information indicates a user plane security protection method of a first PC5 link and a user plane security protection method of a second PC5 link, where the user plane security protection method of the first PC5 link is the same as the user plane security protection method of the second PC5 link.