Method and user equipment for selecting core network

Abstract

The invention relates to a method for a user equipment operating on a first base node of a cellular network, the first base node communicatively coupled to two core networks of the cellular network, the user equipment operating in an open data exchange session by means of a data exchange context terminated in a selected one of the two core networks, the user equipment also maintains a first device identity received from said selected core network, the method comprising the following steps for the user equipment:-identifying at least one second base node of said cellular network,-checking whether said at least one second base node is able to access the selected core network,-if not,-determining that the at least one second base node is able to access the selected core network. Sending a connection reestablishment message to a second base node capable of accessing a core network (hereinafter referred to as a second core network) different from the selected core network, receiving a second device identity of the second core network by the second base node, sending an acknowledgement message to the second base node, -resuming the data exchange session with the second base node over a second core network using the second device identity.

Description

technical field [0001] The invention relates to a method for selecting a core network of a cellular network comprising at least two core networks. The invention also relates to user equipment using the method. [0002] Furthermore, the invention relates to a base node of a cellular network. The invention also relates to a method for said base node. Background technique [0003] With the emergence of new technology standards, especially the emergence of new radio (5G), began to discuss how to make LTE (4G) network architecture and 5G core architecture coexist and work closely together. Accordingly, the decision was made to introduce 5G in the so-called non-standalone (NSA) mode, which means that 5G gNodB (GNB) will provide a new air interface for 5G-compliant user equipment (UE), but the core network behind it is using the available 4G infrastructure. However, the full deployment of 5G should also include the introduction of 5G infrastructure. [0004] Therefore, for use...

AI Technical Summary

Problems solved by technology

[0009] However, there may be cases where an adjacent base node cannot support the same core network as the previous base node

This will cause the connection to be lost and a new connection to be established because the context cannot be acquired, simply due to the fact that access to the previously used core network is not available

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