Relay UE Network Assistance Security for U2U Relay
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Solution Overview
Problem
Existing wireless communication systems face challenges in establishing secure network assistance for UE-to-UE relay communications, particularly in ensuring key request procedures with the network are successful and handling failures effectively.
Innovation Solution
A method and device for a relay User Equipment (UE) that involves receiving a direct communication request, sending a direct communication request to the target UE, and initiating a key request procedure with the network. If the key request fails, the relay UE sends a direct communication security reject message and aborts the direct link establishment procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the relay UE initiates a key request procedure with the network for establishing secure UE-to-UE relay communication, then communication security is improved, but the complexity of the establishment procedure increases due to potential key request failures and additional error handling requirements
Solution Approach 1:
The relay UE performs the key request procedure with the network as a preliminary step before finalizing the direct link establishment with the target UE. By obtaining security keys from the network in advance, the system ensures security requirements are met before committing to the full establishment procedure, thereby improving communication security while managing complexity through staged execution
Solution Approach 2:
The network acts as an intermediary that provides security key distribution services to the relay UE. Instead of the relay UE and target UE attempting direct security establishment, the network mediates the key distribution process, ensuring secure communication while simplifying the overall procedure by centralizing security management
2Reliability
If the relay UE implements comprehensive error handling for key request failures including sending reject messages and aborting procedures, then communication reliability is improved, but the time required for the establishment procedure increases
Solution Approach 1:
The system implements feedback mechanisms where the relay UE monitors the outcome of key request procedures and provides appropriate responses. When key requests fail, the relay UE sends direct communication security reject messages to the target UE and aborts the procedure, ensuring that failed attempts are properly communicated and handled, thereby improving communication reliability through structured feedback loops
Solution Approach 2:
The error handling measures including reject message transmission and procedure abortion are prepared as preliminary responses that are executed immediately upon key request failure. This staged approach ensures that when security key establishment fails, the system quickly transitions to error handling states, minimizing the time spent in failed establishment attempts while maintaining reliable communication protocols
Data Source
AI summary
A method and device for a relay User Equipment (UE) are disclosed. The relay UE receives a first direct communication request message from a source end UE for establishing a UE-to-UE (U2U) relay communication with a target end UE. The relay UE also sends a second direct communication request message to the target end UE in a direct link establishment procedure used for establishing a direct link for supporting the U2U relay communication. The relay UE further receives a direct communication security request message from the target end UE for triggering the relay UE to perform a key request procedure with a network. In addition, the relay UE sends a direct communication security reject message to the target end UE if the key request procedure with the network fails. Furthermore, the relay UE aborts the direct link establishment procedure after sending the direct communication security reject message.