Disaster recovery method, network element and communication system

Abstract

The invention discloses a disaster recovery method, a network element and a communication system. The method comprises steps that 1, that a PGW is in fault is detected by a PCRF; for responding to a business authentication message from an AF, the PCRF selects a second PGW, and the business authentication message is emitted by the AF after a request of taking the UE as a called is received; 2, a business authorization message is sent by the PCRF to the second PGW, the authorization message comprises the information of an in-service SGW of the UE, and an MME is triggered by the second PGW to establish default bearing according to the information of the in-service SGW; and 3, for responding to a business request from the UE, a take-over PGW is selected when a main PGW is detected by the MME to be unavailable through the in-service SGW, bearing is established between the in-service SGW and the take-over PGW, and a business reception message is sent to the UE; if the main PGW is in fault, the called business of the UE is recovered by the take-over PGW in real time according to the information of the in-service SGW stored by the PCRF.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a disaster recovery method, network element and communication system. Background technique [0002] In the Long Term Evolution (LTE) network, the provincial LTE network packet data network gateway (PDN Gateway, PDN-GW, also can be abbreviated as PGW) equipment is deployed in a centralized manner, with large capacity and wide coverage. When the main PGW equipment In the event of a failure, taking over the PGW without disaster recovery data cannot restore user services in time, which will lead to long-term paralysis of large-scale services, especially for VoLTE (Voice over LTE) services. [0003] In the current technology, when the PGW served by the user fails, for disaster recovery of the calling party, the calling service request initiated by the user will be sent to the currently serving MME. Since the MME finds that the PGW currently serving the user has failed, i...

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Problems solved by technology

[0002] In the Long Term Evolution (LTE) network, the provincial LTE network packet data network gateway (PDN Gateway, PDN-GW, also can be abbreviated as PGW) equipment is deployed in a centralized manner, with large capacity and wide coverage. When the main PGW equipment In the event of a failure, taking over the PGW without disaster recovery data cannot restore user services in time, which will lead to long-term paralysis of large-scale services, especially for VoLTE (Voice over LTE) services

[0003] In the current technology, when the PGW served by the user fails, for disaster recovery of the calling party, the calling service request initiated by the user will be sent to the currently serving MME. Since the MME finds that the PGW currently serving the user has failed, it will send The user sends a service rejection, instructing the terminal to initiate reattachment, which will interrupt the call. After the user reattachs successfully, the user initiates the calling again to restore the calling service; for the called disaster recovery recovery, the application function AF detects a PGW failure Afterwards, the application function AF will send the downlink data request to the takeover PGW. Since the takeover PGW has no disaster recovery user data, the takeover PGW will discard the downlink data request, thereby interrupting the called service. At this time, the user cannot be notified to reattach. We can only wait for the periodic tracking area update (Tracking Area Update, TAU). At present, according to the requirements of international standards, the periodic TAU update period is about 1 hour. After waiting for about 1 hour, the periodically updated TAU will find the current The service PGW failure triggers re-attachment, and the service cannot be restored until the user attaches successfully, so the called service will be interrupted for about an hour, which has a great impact on the user service

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