Communication method, device and system

Abstract

The embodiment of the present invention provides a communication method, device and system, which can enable a terminal device to switch to a correct target cell after the terminal device moves out ofa coverage area of a first private network, and ensure service continuity at the same time. The method comprises the following steps: a first mobility management network element receives a first cellidentifier and a network identifier from the first network element, wherein the network identifier comprises an identifier of a first private network and an identifier of a second private network; the first mobility management network element acquires information of a second network element according to the first cell identifier and the network identifier, the first network element serves the terminal device in a first private network, and the second network element serves the terminal device in a second private network; the first mobility management network element sends a first cell identifier and a network identifier to a second network element indicated by the information of the second network element, wherein the first cell identifier and the network identifier are used for acquiringdownlink routing information, and the downlink routing information is used for indicating transmission of downlink data from a first user plane entity in the first private network to a second user plane entity in the second private network.

Description

technical field [0001] The present application relates to the technical field of communication, and in particular to a communication method, device and system. Background technique [0002] In order to meet the diverse needs of vertical industry private network scenarios, the 3rd generation partnership project (3rd generation partnership project, 3GPP) standard organization defines two types of private network modes, namely type A (type A) mode and type B (type B )model. Among them, in the type B mode, the vertical industry private network is independent, and it does not have any interaction requirements with the public land mobile network (PLMN). As for the Type A mode, there is a requirement for intercommunication with the PLMN. For example, if figure 1 As shown, factory A and factory B are both located within the coverage of the private network in type A mode. When enterprise users leave factory A and go to factory B, in order to ensure business continuity, PLMN is req...

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Problems solved by technology

[0003] However, if figure 2 As shown, in general, the network coverage of the PLMN and the private network of type A mode overlaps, and the terminal device may be located in the overlapping coverage area of ​​the private network of type A mode and the PLMN

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