Method, device and equipment for terminal changing between 4G and 5G networks

Abstract

The invention provides a method, device and equipment for a terminal changing between 4G and 5G networks. The method comprises that management equipment corresponding to the target network sends an access acceptance message with an activation indication; and the activation indication indicates the terminal to reactivate public data network (PDN) connection or a protocol data unit (PDU) of the source network in the target network, or indicates the terminal that the public data network (PDN) connection or a protocol data unit (PDU) has been activated in the target network.

Description

technical field [0001] The present invention relates to the field of mobile communication technologies, and in particular to a method, device and equipment for a terminal to move between 4G and 5G networks. Background technique [0002] Mobile communication technology has now developed to the 4G stage. Compared with the previous generations, the 4G network architecture is mainly characterized by all-IP transmission. 3GPP is currently studying the 5G network architecture, figure 1 It is an architecture for intercommunication between 4G network and 5G network. The functions of each network element in the network architecture are as follows: [0003] The user equipment (User Equipment, UE) mainly accesses the 4G network through the wireless air interface and obtains services, exchanges information with the base station through the air interface, and exchanges information with the mobile management entity of the core network through non-access stratum signaling (Non Access St...

AI Technical Summary

Problems solved by technology

[0010] When the UE moves from the 5G network to the 4G network, since the 4G TA selected for access is not in the above TAI list, and the above single registration indication / dual registration indication is invalid in the newly selected TA, the UE cannot determine that it should send With the TAU request message or the handover attach process

Moreover, if the UE sends a TAU request message, but if there is no Nx interface between the MME and the AMF originally accessed by the UE, then the MME cannot obtain the UE's mobility management context from the AMF, so the MME will reject the UE's access ( The MME returns a TAU rejection message to the UE); when the UE receives the TAU rejection message from the MME, the UE will re-perform the initial attach process and generate more signaling; if the UE directly performs the handover attach process, but if the MME and the UE originally access There is an Nx interface between the AMFs, then the handover attach process will also bring redundant signaling

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