Non-3GPP Re-Authorization Network Selection for Session Continuity
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Solution Overview
Problem
The existing communication mechanisms fail to ensure that a terminal device establishes a session with a network element device that meets the mobility access restriction conditions during re-authorization procedures, leading to session failures.
Innovation Solution
A communication method that involves sending request information to a network device to perform a re-authorization procedure, receiving indication information about core network types and data interworking needs, and selecting a network element device based on this information to establish a connection, ensuring compliance with mobility access restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ePDG selects a network element device during the re-authorization procedure without considering mobility access restriction conditions, then the session establishment process is simple and fast, but the terminal device fails to establish the session because the selected network element device does not meet the mobility access restriction condition
Solution Approach 1:
The network device performs preliminary actions by determining mobility access restriction conditions (first indication information) and data interworking requirements (second indication information) before the ePDG selects a network element device. This advance preparation ensures that the ePDG can select an appropriate device that meets the restriction conditions, preventing session establishment failures while maintaining procedural efficiency
Solution Approach 2:
The network device provides feedback to the ePDG by sending first indication information (mobility access restriction conditions) and second indication information (data interworking requirements). This feedback mechanism enables the ePDG to make informed selection decisions that comply with mobility access restrictions, thereby improving session establishment success rate without significantly increasing procedure complexity
2Reliability
If the ePDG performs thorough selection based on mobility access restriction conditions and data interworking requirements, then the session establishment reliability is improved, but the re-authorization procedure complexity increases
Solution Approach 1:
The network device determines mobility access restriction conditions and data interworking requirements in advance before the ePDG needs to select a network element device. This preliminary determination reduces the time required for the ePDG to perform thorough selection, as the selection criteria are already prepared and available, thereby balancing reliability improvement with time efficiency
Solution Approach 2:
The network device efficiently communicates selection criteria (first and second indication information) to the ePDG through structured feedback. This organized feedback mechanism enables the ePDG to quickly process selection requirements and make accurate decisions, improving session establishment reliability while minimizing the time loss in the re-authorization procedure
Data Source
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AI summary
This application provides a communication method, apparatus, and system, and relates to the field of communication technologies. The method includes: sending request information to a network device, where the request information indicates to perform a re-authorization procedure for a terminal device, and the terminal device accesses a core network by using a non-3GPP access technology; receiving first indication information and/or second indication information from the network device, where the first indication information indicates a core network type that supports access of the terminal device, and the second indication information indicates whether data interworking between different types of core networks needs to be performed; and selecting a network element device based on the first indication information and/or the second indication information, where the network element device is configured to establish a connection to the terminal device. According to the method, the first indication information and/or the second indication information can be obtained, to help correctly select the network element device configured to establish the connection to the terminal device.