Session establishment method and device

Abstract

The embodiment of the present application provides a session establishment method and device, so that when the terminal switches multiple PDU sessions with the same DNN established in the 5G network to the PDN connection of the 4G network, it ensures that each PDU session can be switched to 4G. Anchoring to the same functional network element of the control plane ensures that each PDN connection after handover has a different APN, so that the control of the APN AMBR can be realized. The method includes: the terminal sends a first request message for establishing a PDU session, wherein the first request message includes a data network name DNN; the terminal receives a first response message, and the first response message includes an access point name APN The terminal sends a second request message for establishing a PDN connection to a mobility management network element, where the second request message includes the APN.

Description

technical field [0001] The present application relates to the technical field of communications, and in particular to a method and device for establishing a session. Background technique [0002] With the rapid development of wireless communication technology, the fifth generation (Fifth Generation, 5G) mobile communication technology has emerged. In the initial stage of network deployment, due to insufficient coverage of the 5G network, when the location of the user equipment (User Equipment, UE) changes, handover of the UE between the 5G network and the fourth generation (Forth Generation, 4G) network may occur. [0003] The access point name (APN) parameter is required to establish a packet data network (PDN) connection in a 4G network, while the data network is required to create a protocol data unit (PDU) session in 5G Name (data network name, DNN) and single network slice selection assistance information (single network slice selection assistance information, S-NSSAI)...

AI Technical Summary

Problems solved by technology

And 5G does not stipulate that sessions of the same DNN must select the same session management device, therefore, these multiple PDU sessions with the same DNN may be anchored on different session management devices

[0006] However, in 4G, in order to control the APN aggregated maximum bit rate (Aggregated Maximum Bit Rate, AMBR), it is required that multiple PDN connections of the same APN can only be anchored on one session management device.

If multiple PDU sessions with the same DNN in 5G are switched to multiple PDN connections with the same APN in 4G, the APN AMBR in 4G will not be able to be controlled if the session continuity is satisfied

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