A method, device and system for selecting a session management function network element

Abstract

A method, device and system for selecting a session management function network element, the method comprising: determining whether a user plane function network element that meets a screening condition exists, and if yes, sending first state information of a session management function network element to a network function storage library function network element, the first state information of the session management function network element being used to indicate that the session management function network element is available under the filtering condition, and the first state information also being used to select a session management function network element. Therefore, when subsequently selecting the session management function network element, the session management function network element may be selected according to the state thereof, and it may be ensured to the greatest extent possible that an available session management function network element may be selected so as to reduce the delay in creating a session process.

Description

technical field [0001] The present application relates to the technical field of communications, and in particular to a method, device and system for selecting a network element with a session management function. Background technique [0002] In the process of creating a packet data unit (packet data unit, PDU) session (session), it includes the selection of the session management function (SMF) by the access and mobility management function (AMF) process, and the process of selecting a user plane function (userplane function, UPF) by the SMF. When the AMF selects the SMF, it selects the SMF that meets certain parameter requirements. For example, the AMF can send certain parameter requirements to the network function repository function (NRF), and the NRF selects the SMF that meets the parameter requirements, and Send the selection result to AMF. [0003] Using the selection method in the prior art, there may be a situation: AMF selects a SMF, but when the SMF selects a U...

AI Technical Summary

Problems solved by technology

[0003] Using the selection method in the prior art, there may be a situation: AMF selects a SMF, but when the SMF selects a UPF, it cannot select a UPF that meets certain parameter requirements, that is, for the SMF, there is no Available UPF, which means that the SMF selected by AMF is invalid, resulting in activation failure

[0004] It can be seen that this method of selecting SMF is inefficient and brings a large delay to the process of creating a PDU session

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