Application Relocation Using UE Location After PDU Path Changes
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Solution Overview
Problem
In 5G mobile communication networks, the existing application relocation methods based on session and service continuity mode 3 result in delays due to inaccuracies in determining the target application server, as the DNS query does not always identify the most appropriate server, leading to prolonged access times for user equipment.
Innovation Solution
The method involves a network-side device, such as a source application function, determining the target application server based on location information of the user equipment after a change in the user plane path of the PDU session, ensuring accurate identification and reducing access delays without modifying the application client logic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If DNS query is used to determine the target application server, then the application client can obtain a server address, but the determined server is not accurate enough and access delay is long
Solution Approach 1:
The patent introduces a PDU session anchor as an intermediary between the application client and the application server. The PDU session anchor provides location information about the user equipment, which the application function uses to accurately determine the target application server. This intermediary mechanism resolves the inaccuracy of direct DNS queries by providing network-side location data that enables precise server selection based on actual user equipment location.
2Ease of operation
If the application client triggers DNS query to obtain target AS address, then the client can initiate relocation, but the client needs to understand network logic making design complex
Solution Approach 1:
The patent enables the application function on the network side to autonomously determine the target application server using location information from the PDU session anchor. This self-service mechanism eliminates the need for the application client to understand or execute complex network logic related to server selection and relocation triggering. The client simply receives relocation instructions from the network, significantly simplifying its design while maintaining accurate server determination capabilities.
Data Source
AI summary
An application relocation method and apparatus, to accurately determine a determined target AS and therefore reduce a delay in accessing an application server by a UE. A source application function (AF) obtains first information, where the first information is location information of the UE after a user plane path of a protocol data unit (PDU) session of the UE changes. The source AF determines a target application server (AS) based on the first information.