MCPTT Discovery Message Application Layer Identifier Exchange
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Solution Overview
Problem
In MCPTT systems, source users cannot identify target users due to the inability to extract user identifiers from response messages, hindering service communication in Prose mode.
Innovation Solution
The method involves sending a discovery message with application layer identifier information and a security parameter to MCPTT UE, which includes a layer 2 identifier and application layer identifier, enabling accurate identification of peer devices for service communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the source user sends a discovery message with only layer 2 identifier, then the discovery process can be initiated, but the source user cannot identify the target user from the response message
Solution Approach 1:
The discovery message includes the source user's application layer identifier in advance, so that the target user can directly use this identifier to identify the source user when constructing the response message. This preliminary inclusion of identification information eliminates the need for complex reverse lookup processes and ensures that both users can identify each other using application layer identifiers throughout the communication process.
2Reliability
If the response message includes only layer 2 identifier, then the message structure remains simple, but the source user cannot perform service communication in Prose mode
Solution Approach 1:
The response message is designed to include the target user's application layer identifier as feedback information, which directly answers the identification need of the source user. This feedback mechanism ensures that the source user receives the necessary identification information to establish reliable Prose mode service communication with the target user.
3Measurement precision
If application layer identifier is included in discovery message, then target user can be accurately identified, but message encryption and security parameter requirements increase complexity
Solution Approach 1:
Security parameters and encryption requirements are specified in advance in the discovery message format definition. The application layer identifier is included in an encrypted form with pre-defined security parameters, so that the target user can decrypt and identify the source user without requiring complex real-time security negotiations. This preliminary structuring of security requirements maintains identification accuracy while managing complexity through standardization.
Data Source
AI summary
The present application discloses a discovery method and device, and relates to the field of wireless communications technologies, to resolve a problem that existing two communication parties cannot accurately discover each other, and then it cannot be ensured that the two communication parties perform service communication in a Prose manner. The method provided in the present application includes: sending a discovery message, where the discovery message includes application layer identifier information of a discovery target, and the discovery target is at least one target user or at least one communications group of a first user that uses the first MCPTT UE; and receiving a response message sent by second MCPTT UE, where the response message includes a layer 2 identifier of the second MCPTT UE and an application layer identifier of a user that uses the second MCPTT UE.