ims network registration method, device and terminal

Abstract

The invention provides an IMS network registration method and device and a terminal. The method is applied to a terminal that returns from a 2G / 3G network to an LTE network, wherein the LTE network supports a VOLTE service. The method includes the steps: determining whether a network establishes a DRB in a TAU process or not; determining whether the network releases the RRC connection within a predetermined time period or not if the network does not establish the DRB; establishing a new RRC connection if the network releases the RRC connection within the predetermined time period; establishingan IMS PDN connection; performing IMS registration. The method can achieve the quick registration into the IMS network and can improve the registration success rate of the IMS network.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to an IMS network registration method, device and terminal. Background technique [0002] For a terminal that supports VOLTE (Voice over LTE, LTE network audio call), when the terminal returns to the LTE network from the 2G / 3G network, a TAU (Tracking Area Update, tracking area update) process is required, because the terminal does not know whether the current network supports For VOLTE services, the terminal does not instruct the network to establish a user-level bearer after the TAU process is completed in the tracking area update request message sent to the network. At this time, the network generally does not establish a DRB (Data Radio Bearer, data radio bearer), and The network will release the RRC (Radio Resource Control, radio resource control) connection within a short time after the procedure is completed. [0003] After the TAU process is completed, if it i...

AI Technical Summary

Problems solved by technology

[0003] After the TAU process is completed, if it is known that the current network supports VOLTE services, the terminal will immediately initiate an IMS PDN (Public Data Network, public data network) establishment request. At this time, if the network just releases the RRC connection, the IMSPDN establishment fails and can only wait. Timeout retries, resulting in IMS registration delay

In addition, since the terminal does not instruct the network to establish a user plane bearer after the TAU process in the tracking area update request message sent to the network, the network is not ready to process the bearer establishment request initiated by the terminal, so the IMS PDN establishment request may fail Rejected by the network, making subsequent IMS registration impossible

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