5G PDU Session Routing With URSP Consistency Verification
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Solution Overview
Problem
In 5G mobile communications, the User Equipment (UE) may use an incorrect User Equipment Route Selection Policy (URSP) different from the network-side policy, leading to errors in Packet Data Unit (PDU) sessions due to initial network entry failures, malicious use of PDU sessions, or incorrect internal algorithms.
Innovation Solution
A method to verify the consistency of the URSP used by the terminal apparatus with the network-side URSP, ensuring correct PDU session selection by involving network elements like SMF and AM-PCF to confirm alignment and detect actual applications related to the PDU sessions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the terminal apparatus autonomously selects PDU sessions based on URSP without network verification, then the ease of operation is improved, but the reliability deteriorates due to potential URSP inconsistency
Solution Approach 1:
The network side (SMF or AM-PCF) verifies the URSP used by the terminal apparatus by comparing it with the stored URSP. This feedback mechanism ensures that the terminal's autonomous selections align with network policy, resolving the reliability issue while preserving operational ease
Solution Approach 2:
The patent introduces an intermediary verification process where the network element acts as a mediator to check URSP consistency. This intermediary layer ensures reliability without interfering with the terminal's autonomous operation capability
2Measurement precision
If the network verifies URSP consistency through application detection, then the measurement precision is improved, but the device complexity increases due to additional verification mechanisms
Solution Approach 1:
The terminal apparatus performs self-detection of its actual applications and reports this information to the network. This self-service approach enables precise URSP verification without requiring complex network-side detection capabilities
Solution Approach 2:
The network verifies URSP by comparing the terminal's reported application information with expected applications derived from URSP rules. This copying and comparison approach achieves precise verification with minimal additional complexity
Data Source
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AI summary
A communication method and a communications apparatus are provided, to verify a user equipment route selection policy (URSP) used by a terminal apparatus. The communication method includes: obtaining information about a first application of at least one packet data unit (PDU) session, where the information about the first application is determined based on a first URSP; and sending the information about the first application to a second network element, where the information about the first application is used to verify whether information about a second application of the at least one PDU session matches the information about the first application, and the information about the second application is information about an application to which a data packet in the at least one PDU session belongs.