Session path optimization method and device

Abstract

The invention provides a session path optimization method and device, relates to the field of communication, and aims to solve the problem of contradiction between session continuity and path detour in a 5G network architecture by optimizing a session path when a session is in an idle state. The method comprises the following steps that: an anchor point session management network element A-SMF determines that a session path of a first session comprises an intermediate session management network element I-SMF, and the first session is in an activated state; under the condition that a preset condition is met, the A-SMF sends a command message to terminal equipment, wherein the command message is used for instructing the terminal equipment to release the first session, and establishing a data network connected from a second session to the first session; the preset conditions comprise that the A-SMF determines that an area where the I-SMF is located is different from an area where the A-SMF is located, and the first session is converted from an activated state to an idle state.

Description

technical field [0001] The present application relates to the communication field, and in particular to a method and device for optimizing a session path. Background technique [0002] In the fifth generation (5th generation, 5G) network, in order to meet the business continuity requirements of different applications, three different sessions and business continuity are designed for the protocol data unit (PDU) session (PDU session) Mode (session and service continuity mode, SSC mode). Among them, SSC mode 1 can provide session continuity, and is mainly used in typical applications such as IP multimedia subsystem (IP multimedia subsystem, IMS) voice that have high requirements for continuity. The user plane function (user plane function, UPF) as the user plane anchor remains unchanged throughout the life cycle of the session. If the anchor UPF (anchor UPF) in the session of the terminal device cannot be covered due to the movement of the terminal device To the terminal dev...

AI Technical Summary

Problems solved by technology

[0003] However, although this method ensures the continuity of sessions and services, it cannot guarantee the optimal bearer path of services. detour

On the one hand, the circuitous path increases the session delay. On the other hand, when the terminal device moves across regions, especially across provinces (cross-regions), functions or services based on the location of the terminal device will not be realized.

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