Relay UE Session Mapping for Remote Identifier Resolution
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Solution Overview
Problem
The session management function of a relay UE fails to accurately determine the permanent identifier of a remote UE, leading to security issues in proximity-based services due to the unavailability of the remote UE's permanent identifier, which hinders secure communication when the remote UE uses a relay UE for network access.
Innovation Solution
The session management function of the relay UE obtains the permanent identifier of the remote UE by using information from the relay UE's report, including routing indicator, HPLMN identifier, and proximity-based service key management function information, to ensure secure communication by mapping the remote UE's report to its permanent identifier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the session management function of the relay UE attempts to map the remote UE report to the permanent identifier, then communication security is improved, but the session management function fails to accurately determine the permanent identifier because it is not available, leading to security issues
Solution Approach 1:
The patent introduces an intermediary mechanism where the session management function obtains the permanent identifier through indirect means - by receiving the routing indicator from the relay UE, querying the permanent identifier using this indicator as a key, and then performing the mapping. This intermediary query process resolves the contradiction by making the permanent identifier available through an intermediate lookup step rather than direct availability.
2Measurement precision
If the session management function obtains the permanent identifier through the relay UE report and routing indicator, then mapping accuracy is improved, but signaling overhead increases due to additional information exchange
Solution Approach 1:
The patent applies preliminary action by having the session management function query and obtain the permanent identifier in advance using the routing indicator before the actual mapping operation is needed. This preliminary acquisition of information allows the mapping to be performed accurately without repeated signaling exchanges, thereby reducing overall signaling overhead while maintaining high mapping precision.
Data Source
AI summary
This application provides a communication method and a communication apparatus. A session management function of a relay terminal may determine a communication address of a proximity-based service key management function of the relay terminal based on information about the relay terminal and/or information about the proximity-based service key management function of the relay terminal. In this way, the session management function of the relay terminal obtains permanent identifier information of a remote terminal from a proximity-based service key management function of the remote terminal via the proximity-based service key management function of the relay terminal, so that the session management function of the relay terminal can complete mapping between a remote terminal report and a permanent identifier of the remote terminal.