Differentiated DNS Handling for Lower 5G PDU Session Signaling
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Solution Overview
Problem
The existing communication methods in 3GPP networks result in repeated sending of DNS information and signaling overhead due to uniform handling of DNS information across multiple PDU sessions, leading to inefficiencies and suboptimal user service experience.
Innovation Solution
A communication method where a Session Management Function (SMF) sends differentiated DNS handling information to an Edge Application Server Discovery Function (EASDF) based on association relationships, allowing the EASDF to apply specific DNS handling rules for each PDU session or user equipment, thereby reducing redundant information transmission and signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the SMF sends DNS information handling rules and ECS options at a PDU session granularity, then each PDU session can have specific DNS handling information, but repeated sending of the same information occurs across multiple PDU sessions
Solution Approach 1:
The patent segments DNS handling information into two parts: common information (sent once at network slice or PLMN level) and session-specific information (sent only when needed). This segmentation allows the SMF to avoid repeating the same DNS handling rules across multiple PDU sessions while still providing differentiated handling when required.
Solution Approach 2:
The patent implements preliminary action by sending common DNS information handling rules in advance at a higher granularity (network slice or PLMN level) before PDU session establishment. This preliminary sending eliminates the need to repeatedly transmit the same information during each PDU session, reducing signaling overhead while maintaining adaptability.
2Reliability
If the SMF updates DNS information handling rules for each PDU session, then each session receives updated rules, but a large amount of signaling is generated
Solution Approach 1:
The patent merges the update mechanism for common DNS handling information across multiple PDU sessions. When a DNS information handling rule needs updating, the SMF sends the updated common information once at the network slice or PLMN level, and all PDU sessions benefit from this single update without requiring individual session updates, thereby reducing signaling traffic while maintaining reliability.
3Loss of energy
If uniform DNS information handling is applied across multiple PDU sessions, then signaling overhead is reduced, but information processing efficiency and user service experience deteriorate
Solution Approach 1:
The patent applies local quality by allowing different DNS handling information to be configured for different network slices or PLMNs based on local requirements. Each network slice or PLMN can have customized DNS handling rules that match its specific needs, improving information processing efficiency and user service experience while avoiding unnecessary signaling overhead through the use of common information where applicable.
Data Source
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AI summary
This application provides a communication method and apparatus. The method includes: A session management function obtains at least one group of first association relationships, where the first association relationship is a correspondence between identification information of domain name system DNS handling information and the DNS handling information. The SMF sends, to an edge application server discovery function EASDF, the at least one group of first association relationships used for protocol data unit PDU sessions of a plurality of terminal devices, and sends, to the EASDF, a first message corresponding to a first PDU session, where the first information includes first identification information, and the first identification information is identification information of DNS handling information corresponding to the first PDU session. The EASDF receives the first association relationship and the first message, and determines, based on the first association relationship and the first identification information, the DNS handling information corresponding to the first PDU session. This improves service experience of a user and information processing efficiency.