CN113473508A

CN113473508A - Communication method and communication device

Info

Publication number: CN113473508A
Application number: CN202010236478.XA
Authority: CN
Inventors: 陈曦; 夏渊; 钱宏
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-03-30
Filing date: 2020-03-30
Publication date: 2021-10-01
Anticipated expiration: 2040-03-30
Also published as: CN113473508B; WO2021196962A1

Abstract

The application provides a communication method and a communication device. The method comprises the following steps: a disaster tolerance user plane function UPF acquires a first intercommunication protocol IP address of a first UPF; the method comprises the steps that a disaster recovery UPF issues first routing information of the disaster recovery UPF to a first routing network, wherein the first routing network is a routing network between an access network and a core network, the first routing information corresponds to a first IP address, the priority of the first routing information is lower than that of second routing information, the second routing information is uplink routing information of the first UPF, and the second routing information corresponds to the first IP address. The method provided by the application can enable the terminal equipment to transmit data through the low-priority route issued by the disaster tolerance UPF in a route conversion mode when the UPF fails, thereby avoiding interruption of service transmission and ensuring continuity of service transmission.

Description

Communication method and communication device

Technical Field

The present application relates to the field of communications, and more particularly, to a communication method and a communication apparatus.

Background

Currently, the fifth generation mobile communication technology (5th-generation, 5G) is in a vigorous development period, and a 5G wireless communication core network includes the following functions: user Plane Function (UPF); access and mobility management function (AMF); session Management Function (SMF), and the like. A User Equipment (UE) needs to access a UPF of a 5G core network through AN Access Network (AN) so as to access a Data Network (DN). The UPF may also be referred to as UPF entity or network element UPF, which also applies to network element SMF and network element AMF. The network element SMF controls the selection and access of the UPF. The SMF manages one or more UPFs to which the UE can access via an Internet Protocol (IP) address.

In the prior art, when a UPF fails, the UPF loses all user contexts, service transmission of a user is interrupted in a recovery process, and end-to-end sensing is required in a session recovery process of the UPF, so that a large amount of signaling impact is generated, and a network is stressed greatly.

Disclosure of Invention

The application provides a communication method, and a disaster tolerant UPF enables a terminal device to transmit data by using a low-priority user route issued by the disaster tolerant UPF through route conversion when the UPF fails and the high-priority user route issued by the terminal device fails, so that the problem of service transmission interruption when the UPF fails is solved, and the continuity of service transmission is ensured.

In a first aspect, a communication method is provided, the method including: a disaster tolerance user plane function UPF acquires a first network protocol IP address of a first UPF; the method comprises the steps that a disaster recovery UPF issues first routing information of the disaster recovery UPF to a first routing network, wherein the first routing network is a routing network between an access network and a core network, the first routing information corresponds to a first IP address, the priority of the first routing information is lower than that of second routing information, the second routing information is uplink routing information of the first UPF, and the second routing information corresponds to the first IP address.

By issuing the first routing information corresponding to the first UPF to the routing network, when the second routing information of the first UPF fails due to the failure of the first UPF, the uplink data can be subjected to routing conversion, and the first routing information of the disaster tolerance UPF is utilized for data transmission, so that the interruption of service transmission is avoided, and the continuity of service transmission is ensured.

With reference to the first aspect, in certain implementations of the first aspect, the first routing information further includes a tunnel endpoint identifier of a first terminal device served by the first UPF, and the method further includes: and the disaster tolerance UPF receives first information sent by a Session Management Function (SMF), wherein the first information comprises a tunnel endpoint identifier of the first terminal equipment.

With reference to the first aspect, in certain implementations of the first aspect, the method further includes: the disaster tolerance UPF acquires third information, wherein the third information is used for indicating an IP address segment corresponding to each UPF in a plurality of UPFs; receiving fourth information sent by the SMF, wherein the fourth information comprises a second IP address of the first terminal equipment; and sending fifth information to the SMF, where the fifth information includes an identifier of the first UPF, and the second IP address belongs to an IP address segment corresponding to the first UPF, so that the SMF determines the first UPF as a service UPF of the first terminal device according to the fifth information.

With reference to the first aspect, in certain implementations of the first aspect, the method further includes: the disaster tolerance UPF acquires sixth information, wherein the sixth information is used for indicating an IP address segment corresponding to each UPF in the plurality of UPFs; allocating the second IP address to the first terminal equipment; and sending seventh information to the SMF, where the seventh information includes an identifier of the first UPF, and the second IP address belongs to an IP address segment corresponding to the first UPF, so that the SMF determines the first UPF as the service UPF of the first terminal device according to the seventh information.

With reference to the first aspect, in some implementation manners of the first aspect, after the failure of the first UPF is recovered, the disaster recovery UPF recovers the user data to the first UPF by using a private data encapsulation manner.

The user data is recovered to the first UPF through the disaster tolerance UPF, only information interaction is needed between the SMF and the UPF in the recovery process, and peripheral network elements are not sensed, so that end-to-end sensing is reduced, and signaling impact is avoided.

With reference to the first aspect, in some implementations of the first aspect, a heartbeat message is maintained between the first UPF and the disaster tolerance UPF when the first UPF is operating normally.

In a second aspect, a communication method is provided, the method comprising: a disaster tolerance User Plane Function (UPF) acquires a second network protocol (IP) address of a first terminal device served by the first UPF; the disaster recovery UPF issues third routing information of the disaster recovery UPF to a second routing network, where the second routing network is a routing network between a core network and a data network, the third routing information corresponds to the second IP address, a priority of the third routing information is lower than a priority of fourth routing information, the fourth routing information is downlink routing information of the first UPF, and the fourth routing information corresponds to the second IP address.

By issuing the third routing information corresponding to the first UPF to the routing network, when the fourth routing information of the first UPF fails due to the failure of the first UPF, the downlink data can be subjected to routing conversion, and the third routing information of the disaster tolerance UPF is utilized for data transmission, so that the interruption of service transmission is avoided, and the continuity of service transmission is ensured.

With reference to the second aspect, in certain implementations of the second aspect, the method further includes: the disaster tolerance UPF receives second information sent by a session management function SMF, where the second information includes channel information of an access network, and the method further includes: and the disaster recovery UPF sends downlink data to the first terminal equipment according to the channel information.

With reference to the second aspect, in certain implementations of the second aspect, the method further includes: the disaster tolerance UPF acquires third information, wherein the third information is used for indicating an IP address segment corresponding to each UPF in a plurality of UPFs; receiving fourth information sent by the SMF, wherein the fourth information comprises a second IP address of the first terminal equipment; and sending fifth information to the SMF, where the fifth information includes an identifier of the first UPF, and the second IP address belongs to an IP address segment corresponding to the first UPF, so that the SMF determines the first UPF as a service UPF of the first terminal device according to the fifth information.

With reference to the second aspect, in certain implementations of the second aspect, the method further includes: the disaster tolerance UPF acquires sixth information, wherein the sixth information is used for indicating an IP address segment corresponding to each UPF in the plurality of UPFs; allocating the second IP address to the first terminal equipment; and sending seventh information to the SMF, where the seventh information includes an identifier of the first UPF, and the second IP address belongs to an IP address segment corresponding to the first UPF, so that the SMF determines the first UPF as the service UPF of the first terminal device according to the seventh information.

With reference to the second aspect, in some implementation manners of the second aspect, after the failure of the first UPF is recovered, the disaster recovery UPF recovers the user data to the first UPF by using a private data encapsulation manner.

With reference to the second aspect, in some implementations of the second aspect, a heartbeat message is maintained between the first UPF and the disaster recovery UPF when the first UPF is operating normally.

In a third aspect, a communication method is provided, the method including: a session management function SMF sends a first activation request message to a disaster recovery user name function UPF, where the first activation request message is used to request activation of a first terminal device, the disaster recovery UPF is used to obtain a first network protocol IP address of the first UPF, and to issue a first routing message of the disaster recovery UPF to a first routing network, the first routing network is a routing network between an access network and a core network, the first routing message corresponds to the first IP address, and the priority of the first routing message is lower than that of a second routing message, the second routing message is an uplink routing message of the first UPF, the second routing message corresponds to the first IP address, or the disaster recovery UPF is used to obtain a second IP address of a first terminal device served by the first UPF, and to issue a third routing message of the disaster recovery UPF to the second routing network, the second routing network is a routing network between a core network and a data network, the third routing information corresponds to the second IP address, the priority of the third routing information is lower than that of fourth routing information, the fourth routing information is downlink routing information of the first UPF, the fourth routing information corresponds to the second IP address, and the second IP address of the first terminal device belongs to the IP address segment corresponding to the first UPF; the SMF receives first response information sent by the disaster recovery UPF, wherein the response information comprises an identifier of the first UPF; the SMF sends a second activation request to the first UPF according to the first response information, wherein the second activation request information is used for requesting to activate the first terminal equipment; the SMF receives second response information sent by the first UPF, wherein the second response information comprises the first IP address; the SMF sends third activation request information to the disaster recovery UPF, wherein the third activation request information comprises channel information of an access network, and the channel information is used for downlink data transmission of the disaster recovery UPF; the SMF receives third response information sent by the disaster tolerant UPF, wherein the third response information is used for indicating that a downlink channel of the disaster tolerant UPF is opened; the SMF sends fourth activation request information to the first UPF, wherein the fourth activation request information comprises channel information of the access network, and the channel information is used for downlink data transmission of the first UPF; and the SMF receives fourth response information sent by the first UPF, wherein the fourth response information is used for indicating that the first UPF downlink channel is opened.

The SMF activates the same user in the first UPF and the disaster tolerance UPF respectively, so that when the first UPF fails to cause the routing failure, the SMF can realize the data transmission by using the first routing information and the third routing information issued by the disaster tolerance UPF through routing conversion, thereby avoiding the interruption of data transmission and ensuring the continuity of service transmission.

With reference to the third aspect, in certain implementations of the third aspect, when the IP address of the first terminal device is allocated by the SMF, the first activation request information further includes a second IP address of the first terminal device.

With reference to the third aspect, in some implementations of the third aspect, when the IP address of the first terminal device is the disaster tolerance UPF allocation, the first response information further includes a second IP address of the first terminal device.

With reference to the third aspect, in certain implementations of the third aspect, when the tunnel endpoint identifier of the first terminal device is allocated by the first UPF, the second response information and the third activation request information further include the tunnel endpoint identifier of the first terminal device.

With reference to the third aspect, in certain implementations of the third aspect, the method further includes: and after the first UPF is recovered from the fault, the SMF recovers the user data to the first UPF in a private data packaging mode.

The user data is recovered to the first UPF through the SMF, only information interaction is needed between the SMF and the UPF in the recovery process, and peripheral network elements are not sensed, so that end-to-end sensing is reduced, and signaling impact is avoided.

In a fourth aspect, there is provided a communication apparatus, the apparatus comprising: the acquisition module is used for acquiring a first network protocol IP address of a first user plane function UPF; a sending module, configured to issue first routing information of a disaster recovery UPF to a first routing network, where the first routing network is a routing network between an access network and a core network, the first routing information corresponds to the first IP address, a priority of the first routing information is lower than a priority of second routing information, the second routing information is uplink routing information of the first UPF, and the second routing information corresponds to the first IP address.

With reference to the fourth aspect, in some implementations of the fourth aspect, the first routing information further includes a tunnel endpoint identifier of a first terminal device served by the first UPF, and the apparatus further includes: a receiving module, configured to receive first information sent by a session management function SMF, where the first information includes a tunnel endpoint identifier of the first terminal device.

With reference to the fourth aspect, in some implementations of the fourth aspect, the obtaining module is further configured to: acquiring third information, wherein the third information is used for indicating an IP address field corresponding to each UPF in a plurality of UPFs; the receiving module is further configured to receive fourth information sent by the SMF, where the fourth information includes a second IP address of the first terminal device; the sending module is further configured to: and sending fifth information to the SMF, where the fifth information includes an identifier of the first UPF, and the second IP address belongs to an IP address segment corresponding to the first UPF, so that the SMF determines the first UPF as a service UPF of the first terminal device according to the fifth information.

With reference to the fourth aspect, in some implementations of the fourth aspect, the obtaining module is further configured to: acquiring sixth information, wherein the sixth information is used for indicating an IP address field corresponding to each UPF in a plurality of UPFs; the device further comprises: the processing module is used for distributing the second IP address for the first terminal equipment; the sending module is further configured to: and sending seventh information to the SMF, where the seventh information includes an identifier of the first UPF, and the second IP address belongs to an IP address segment corresponding to the first UPF, so that the SMF determines the first UPF as the service UPF of the first terminal device according to the seventh information.

With reference to the fourth aspect, in certain implementations of the fourth aspect, the apparatus further includes: and the data recovery module is used for recovering the user data to the first UPF in a private data packaging mode after the first UPF is recovered from the fault.

With reference to the fourth aspect, in some implementations of the fourth aspect, the heartbeat message is maintained between and when the disaster recovery UPF and the first UPF are operating normally.

In a fifth aspect, a communication apparatus is provided, the apparatus comprising: the acquisition module is used for acquiring a second network protocol IP address of the first terminal equipment of the first user plane function UPF service; a sending module, configured to issue third routing information of a disaster recovery UPF to a second routing network, where the second routing network is a routing network between a core network and a data network, the third routing information corresponds to the second IP address, a priority of the third routing information is lower than a priority of fourth routing information, the fourth routing information is downlink routing information of the first UPF, and the fourth routing information corresponds to the second IP address.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the apparatus further comprises: a receiving module, configured to receive second information sent by a session management function SMF, where the second information includes channel information of an access network, and the sending module is further configured to: and sending downlink data to the first terminal equipment according to the channel information.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the obtaining module is further configured to: acquiring third information, wherein the third information is used for indicating an IP address field corresponding to each UPF in a plurality of UPFs; the receiving module is further configured to receive fourth information sent by the SMF, where the fourth information includes a second IP address of the first terminal device; the sending module is further configured to: and sending fifth information to the SMF, where the fifth information includes an identifier of the first UPF, and the second IP address belongs to an IP address segment corresponding to the first UPF, so that the SMF determines the first UPF as a service UPF of the first terminal device according to the fifth information.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the obtaining module is further configured to: acquiring sixth information, wherein the sixth information is used for indicating an IP address field corresponding to each UPF in a plurality of UPFs; the device further comprises: the processing module is used for distributing the second IP address for the first terminal equipment; the sending module is further configured to: and sending seventh information to the SMF, where the seventh information includes an identifier of the first UPF, and the second IP address belongs to an IP address segment corresponding to the first UPF, so that the SMF determines the first UPF as the service UPF of the first terminal device according to the seventh information.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the apparatus further comprises: and the data recovery module is used for recovering the user data to the first UPF in a private data packaging mode after the first UPF is recovered from the fault.

With reference to the fifth aspect, in some implementations of the fifth aspect, the heartbeat message is maintained between and when the disaster recovery UPF and the first UPF are operating normally.

In a sixth aspect, there is provided a communication apparatus, the apparatus comprising: a sending module, configured to send first activation request information to a disaster tolerance user plane function UPF, where the first activation request information is used to request activation of a first terminal device, and the disaster tolerance UPF is used to obtain a first network protocol IP address of the first UPF and issue first routing information of the disaster tolerance UPF to a first routing network, the first routing network is a routing network between an access network and a core network, the first routing information corresponds to the first IP address, and a priority of the first routing information is lower than a priority of second routing information, the second routing information is uplink routing information of the first UPF, the second routing information corresponds to the first IP address, or the disaster tolerance UPF is used to obtain a second IP address of a first terminal device served by the first UPF and issue third routing information of the disaster tolerance UPF to the second routing network, the second routing network is a routing network between a core network and a data network, the third routing information corresponds to the second IP address, the priority of the third routing information is lower than that of fourth routing information, the fourth routing information is downlink routing information of the first UPF, the fourth routing information corresponds to the second IP address, and the second IP address of the first terminal device belongs to the IP address segment corresponding to the first UPF; a receiving module, configured to receive first response information sent by the disaster recovery UPF, where the response information includes an identifier of the first UPF, and a second IP address of the first terminal device belongs to an IP address segment corresponding to the first UPF; the sending module is further configured to: sending a second activation request to the first UPF according to the first response information, wherein the second activation request information is used for requesting to activate the first terminal equipment; the receiving module is further configured to: receiving second response information sent by the first UPF, wherein the second response information comprises the first IP address; the sending module is further configured to: sending a third activation request message to the disaster recovery UPF, where the third activation request message includes channel information of an access network, and the channel information is used for downlink data transmission of the disaster recovery UPF; the receiving module is further configured to: receiving a third response message sent by the disaster recovery UPF, wherein the third response message is used for indicating that the disaster recovery UPF downlink channel is opened; the sending module is further configured to: sending a fourth activation request to the first UPF, wherein the fourth activation request message includes channel information of the access network, and the channel information is used for downlink data transmission of the first UPF; the receiving module is further configured to: and receiving a fourth response message sent by the first UPF, wherein the fourth response message is used for indicating that the first UPF downlink channel is opened.

With reference to the sixth aspect, in certain implementations of the sixth aspect, the apparatus further comprises: the processing module is used for distributing an IP address for the first terminal equipment; and the first activation request information further includes the second IP address of the first terminal device.

With reference to the sixth aspect, in some implementations of the sixth aspect, when the IP address of the first terminal device is the disaster recovery UPF allocation, the first response information further includes the IP address of the first terminal device.

With reference to the sixth aspect, in some implementations of the sixth aspect, when the tunnel endpoint identifier of the first terminal device is assigned by the first UPF, the second response message and the third activation request message further include the tunnel endpoint identifier of the first terminal device.

With reference to the sixth aspect, in certain implementations of the sixth aspect, the apparatus further comprises: and the data recovery module is used for recovering the user data to the first UPF in a private data packaging mode after the first UPF is recovered from the fault.

In a seventh aspect, there is provided a communications apparatus comprising means for implementing the first aspect or the method in any possible implementation manner of the first aspect; or means for implementing the second aspect or the method in any possible implementation manner of the second aspect; or means for implementing the third aspect or the method in any possible implementation manner of the third aspect.

In an eighth aspect, there is provided a computer readable storage medium having stored thereon a computer program which, when run, causes an apparatus to perform a method as in the first aspect or any possible implementation of the first aspect, or causes an apparatus to perform a method as in the second aspect or any possible implementation of the second aspect, or causes an apparatus to perform a method as in the third aspect or any possible implementation of the third aspect

In a ninth aspect, a chip system is provided, where the chip system includes a processor configured to call and run a computer program from a memory, so that a communication apparatus in which the chip system is installed executes a method according to the first aspect or any possible implementation manner of the first aspect; or cause the communication device in which the chip system is installed to perform the method as in the second aspect or any possible implementation of the second aspect, or cause the communication device in which the chip system is installed to perform the method as in the third aspect or any possible implementation of the third aspect.

Drawings

Fig. 1 is a schematic diagram of a 5G communication system architecture in the prior art.

Fig. 2 is a schematic diagram of a UPF fault recovery process in the prior art.

Fig. 3 is a schematic diagram of a communication method according to an embodiment of the present application.

Fig. 4 is a schematic diagram of another communication method according to an embodiment of the present application.

Fig. 5 is a schematic diagram of a system partial architecture according to an embodiment of the present application.

Fig. 6 is a schematic diagram of a user activation process according to an embodiment of the present application.

Fig. 7 is a diagram of a data transmission path in the prior art.

Fig. 8 is a schematic diagram of a UPF fault detection and recovery process according to an embodiment of the present application.

Fig. 9 is a schematic diagram of a data transmission path according to an embodiment of the present application.

Fig. 10 is a schematic diagram of a communication device according to an embodiment of the present application.

Fig. 11 is a schematic diagram of another communication device according to an embodiment of the present application.

Fig. 12 is a schematic diagram of another communication device according to an embodiment of the present application.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

Terminal equipment in the embodiments of the present application may refer to user equipment, access terminals, subscriber units, subscriber stations, mobile stations, remote terminals, mobile devices, user terminals, wireless communication devices, user agents, or user devices. The terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved Public Land Mobile Network (PLMN), and the like, which are not limited in this embodiment.

The network device in this embodiment may be a device for communicating with a terminal device, where the network device may be a Base Transceiver Station (BTS) in a global system for mobile communications (GSM) system or a Code Division Multiple Access (CDMA) system, may also be a base station (NodeB, NB) in a Wideband Code Division Multiple Access (WCDMA) system, may also be an evolved node b (eNB, or eNodeB) in an LTE system, may also be a wireless controller in a Cloud Radio Access Network (CRAN) scenario, or may be a relay station, an access point, a vehicle-mounted device, a wearable device, a network device in a future 5G network, or a network device in a future evolved PLMN network, and the like, and the embodiment of the present invention is not limited.

Currently, the fifth generation mobile communication technology (5th-generation, 5G) is in a vigorous development period, and a 5G wireless communication core network includes the following functions: a User Plane Function (UPF) is an entity for forwarding user plane data, serves as an external protocol data unit (PUD) Session anchor point of data network interconnection, and has functions of message routing and forwarding, message detection, user plane part policy execution, legal monitoring, traffic usage reporting, quality of service (QoS) processing, and the like; an access and mobility management function (AMF) is mainly responsible for interfacing with a radio, terminating a Radio Access Network (RAN) CP interface (N2), terminating a non-access stratum (NAS) (N1) and NAS encryption and integrity protection, registration management, connection management, reachability management, mobility management, SM message transfer between a UE and an SMF, UE mobility event notification, and the like; session Management Function (SMF) provides session management functions such as session establishment, modification, and release, and includes functions of tunnel maintenance between UPF and AN node, UE IP address allocation and management, Dynamic Host Configuration Protocol (DHCP), selection and control of UP function, configuration of UPF flow guide function, termination of policy control function interface, charging, roaming function, and policy control correlation.

A user terminal UE needs to access a UPF of a 5G core network through a Radio Access Network (RAN), so as to access a Data Network (DN). The network element SMF controls the selection and access of the UPF. The SMF manages one or more UPFs to which the UE can access via an IP address. Fig. 1 shows a schematic diagram of a 5G system architecture in the prior art, as shown in fig. 1, the diagram includes core network elements AMF, SMF, UPF, and UE and AN access network (R) AN, a data network DN, where a solid line in the diagram represents a data transmission actual path, and the UE-AN-UPF-DN performs signal transmission between the AN and the UPF through a logical interface N3, and performs signal transmission between the SMF and the UPF through a logical interface N4.

And heartbeat messages exist between the UPF and the SMF and are used for confirming whether the UPF is still alive or not, if one UPF fails and cannot return heartbeat response to the SMF, the SMF does not select the UPF for data transmission when the UPF is selected. In the prior art, when a failure occurs in a UPF for transmitting data, if a failure occurs in a part of service nodes of the UPF, for example, a Virtual Machine (VM) failure, the UPF may implement a fast service switching through redundancy backup modes such as N +1 and N way. However, when the UPF has an overall fault, for example, under the scenarios of Direct Current (DC) power down, NLS fault, etc., it is impossible to realize fast recovery service transmission by the current technology, thereby avoiding interruption of service transmission. In the prior art, if the UPF is restarted and rapidly recovered, the SMF will re-establish a connection with the UPF and recover the user session. If the UPF failure cannot be recovered, the SMF reselects the UPF and then recreates the PDU Session for the user.

Fig. 2 shows a schematic diagram of a UPF fault recovery flow in the prior art. As shown in fig. 2, the method 200 includes steps S210 to S280. S210, the SMF sends a heartbeat request (heartbeat request) to the UPF to determine whether the UPF is alive or not. S220, the UPF receives the heartbeat request sent by the SMF, replies a heartbeat response, and the response carries a recovery time stamp (recovery time stamp). And S230, the UPF fails and is restarted. And S240, after the UPF is recovered, receiving the heartbeat request message from the SMF. And S250, the UPF replies a heartbeat response and carries a new recovery value in a recovery time stamp. S260, the SMF finds that a new receiver value is received, deletes all user contexts, and sends a Packet Forwarding Control Protocol (PFCP) link setup request (association setup request), thereby establishing N4 association. S270, the UPF returns a response (PFCP association setup response). And S280, after the link is established, recovering the PFCP session in the UPF. In the prior art, no matter which recovery method is adopted, service transmission is interrupted in the process.

According to the method and the device, the user routing information with different priorities is provided for the same user, so that when the UPF fails and the high-priority user routing fails, the uplink or downlink data of the terminal equipment can be transmitted by using the low-priority user routing issued by the disaster tolerance UPF through routing conversion, and the beneficial effect that the service transmission is uninterrupted when the UPF fails is achieved. Fig. 3 shows a schematic diagram of a communication method of an embodiment of the present application. As shown in fig. 3, the method 300 includes steps S310 and S320, which are described in detail below.

S310, the disaster recovery user plane function UPF obtains a first network protocol IP address of the first UPF.

S320, the disaster tolerant UPF issues the first routing information of the disaster tolerant UPF to a first routing network.

As an embodiment, the first routing network is a routing network between an access network and a core network, the first routing information corresponds to the first IP address, and a priority of the first routing information is lower than a priority of the second routing information, the second routing information is uplink routing information of the first UPF, and the second routing information corresponds to the first IP address.

The disaster tolerance UPF distributes the first routing information with low priority corresponding to the second routing information of the first UPF to the first routing network, so that when the second routing fails due to the failure of the first UPF, the uplink data can be subjected to routing conversion, and the first routing information distributed by the disaster tolerance UPF is used for data transmission, thereby avoiding the interruption of service transmission and ensuring the continuity of service transmission.

Optionally, the first routing information may further include a tunnel endpoint identifier of a first terminal device served by the first UPF, and when the tunnel endpoint identifier of the terminal device is assigned by the UPF, the disaster tolerant UPF may receive the first information sent by the SMF, where the first information may include the tunnel endpoint identifier of the first terminal device.

As an embodiment, the disaster recovery UPF may obtain third information, where the third information is used to indicate an IP address segment corresponding to each UPF in the multiple UPFs; subsequently, the disaster tolerance UPF receives fourth information sent by the SMF, where the fourth information may include a second IP address of the first terminal device; and sending fifth information to the SMF by the disaster recovery UPF, where the fifth information may include an identifier of the first UPF, and the second IP address belongs to an IP address segment corresponding to the first UPF, so that the SMF determines the first UPF as the service UPF of the first terminal device according to the fifth information.

As another embodiment, the disaster recovery UPF may obtain sixth information, where the sixth information is used to indicate an IP address segment corresponding to each UPF in the multiple UPFs; the disaster tolerance UPF may allocate the second IP address to the first terminal device; and sending seventh information to the SMF by the disaster recovery UPF, wherein the seventh information comprises the identifier of the first UPF, and the second IP address belongs to the IP address section corresponding to the first UPF, so that the SMF determines the first UPF as the service UPF of the first terminal equipment according to the seventh information. Optionally, the seventh information may include a second IP address field.

It should be understood that each UPF is configured with one IP address field belonging to itself and one address field belonging to the assigned UE.

As an embodiment, after the failure of the first UPF is recovered, the disaster tolerant UPF may recover the user data from the first UPF by means of private data encapsulation. Alternatively, the private data encapsulation format may be in the form of a table, which may include F-TEID, Session Management (SM) policy, IP address, tunnel information set, and the like. Optionally, after the failure of the first UPF is recovered, data recovery may be performed on the first UPF through the SMF, and the recovery process shown in S260 to S280 of fig. 1 may be adopted, or the private data encapsulation format may be adopted to recover the user data on the first UPF. Optionally, when the disaster tolerant UPF and/or SMF recovers data to the first UPF, user-by-user recovery may be adopted.

The user data is recovered to the first UPF by utilizing the disaster tolerance UPF and/or the SMF, only information interaction is needed between the network element SMF and the UPF in the recovery process, and peripheral network elements are not sensed, so that end-to-end sensing is reduced, and signaling impact is avoided.

Optionally, the first UPF may keep heartbeat messages with the disaster recovery UPF while operating normally.

Fig. 4 is a schematic diagram of another communication method according to an embodiment of the present application. As shown in fig. 4, the method 400 includes S410 and S420.

S410, the disaster recovery user plane function UPF obtains a second network protocol IP address of the first terminal device served by the first UPF.

Optionally, the second IP address of the first terminal device may be allocated by an SMF, or may be allocated by a disaster tolerance UPF.

S420, the disaster tolerant UPF issues the third routing information of the disaster tolerant UPF to the second routing network.

As an embodiment, the second routing network is a routing network between the core network and the data network, the third routing information corresponds to the second IP address, and the priority of the third routing information is lower than the priority of the fourth routing information, the fourth routing information is downlink routing information of the first UPF, and the fourth routing information corresponds to the second IP address.

By issuing the low-priority third routing information corresponding to the fourth routing information of the first UPF to the second routing network, when the fourth routing information of the first UPF fails due to a failure of the first UPF, the downlink data can be subjected to routing conversion, and the third routing information issued by the disaster recovery UPF is used for data transmission, so that interruption of service transmission is avoided, and continuity of service transmission is ensured.

As an embodiment, the disaster tolerant UPF may receive a second message sent by the SMF, where the second message includes channel information of the access network, and the disaster tolerant UPF may forward the downlink data to the access network according to the channel information of the access network. It should be understood that the process and content of the channel information here are the same as the process and content of the UPF receiving the channel information sent by the SMF in the prior art, and redundant description is not repeated in this embodiment.

It should be understood that, in the embodiment of the present application, the disaster tolerant UPF may also determine the first UPF through information interaction with the SMF, or recover the user data from the first UPF through a private data encapsulation format, and the content is the same as that described in the above method 300, and will not be described in detail here.

As an embodiment, the disaster tolerant UPF in the present application may be regarded as a centralized point of UE address allocation of a group of UPFs in architecture, as shown in fig. 5, and a corresponding relationship between a group of UPFs and an address segment, such as a corresponding relationship between UPF1, UPF2, UPF3, and UPF4 and an address segment (segment) seg1, seg2, seg3, and seg4, respectively, may be maintained on the disaster tolerant UPF. Further, the UPF may be represented by corresponding identifiers, such as the UPF1-seg1 is represented by 1, or the UPF1 is represented by 1, and the form of the identifiers is not limited in the present application. When the corresponding relationship between a group of UPFs and the address field is maintained on the disaster tolerant UPF, the disaster tolerant UPF can directly obtain the maintained corresponding relationship, and returns the corresponding identifier to the SMF according to the corresponding relationship and the allocated IP address of the terminal equipment. Optionally, when the corresponding relationship of a group of UPFs is maintained in a disaster recovery UPF, if the disaster recovery UPF fails, because a low-priority user route of the disaster recovery UPF has failed, no user route of the group of UPF data transmission can be converted, and the group of UPF data transmission has no reliability, the group of UPF may not be selected as a UPF for data transmission before the fault recovery of the disaster recovery UPF, and the group of UPF may be selected after the recovery of the disaster recovery UPF. It should be understood that the correspondence maintained by the disaster recovery UPF in the embodiment of the present application may be implemented in a local configuration form.

By maintaining the corresponding relationship of a group of UPFs in the disaster tolerant UPFs, the SMF can be more efficient when activating users in the disaster tolerant UPFs and the UPFs, and the reliability of data transmission can be improved.

Fig. 6 shows a schematic diagram of a user activation flow according to an embodiment of the present application. In order to correspond to the above application embodiments and facilitate understanding, the first IP address, the second IP address, and the first terminal device are also used in the embodiments of the present application for description.

As shown in fig. 6, the method includes steps S610 to S6170, where S610 to S630 are the same as in the prior art, the user initiates a PDU session setup request message, and the AMF calls a service interface to notify the SMF to activate the user.

S640, the SMF initiates a session establishment request to the disaster tolerant UPF, optionally, if the SMF allocates IP and F-TEID to the user, the request message sent by the SMF may carry the second IP address and F-TEID of the first terminal device, and optionally, the SMF may obtain the binding relationship between each UPF and the user address field in a local configuration manner. Optionally, when the disaster tolerant UPF maintains the corresponding relationship between the address fields of the group of UPFs, the SMF may also obtain the corresponding relationship between the disaster tolerant UPF and the user address fields of the group of UPFs in a local configuration manner.

S650, the disaster recovery UPF returns a session establishment request response message, where the response message may include an identifier of the first UPF, where the identifier of the first UPF is used to indicate a correspondence between the first UPF and an address field of the terminal device, and the identifier of the first UPF may be represented by an ID, an index, or a name of the first UPF. Optionally, if the second IP address of the first terminal device is allocated to the disaster recovery UPF, the response message may further include the allocated second IP address of the first terminal device. Optionally, after the disaster tolerance UPF learns the second IP address information carried by the SMF, or after the disaster tolerance UPF allocates the second IP address, that is, after the disaster tolerance UPF learns the second IP address allocated by the terminal device, the disaster tolerance UPF may issue the low-priority user routing information, because the low-priority user routing is determined by the disaster tolerance UPF according to the allocated second IP address of the terminal device. It should be understood that the disaster tolerance UPF may obtain a corresponding relationship between a group of UPFs and the user address field in a local configuration manner, where the corresponding relationship may be represented by a UPF identifier, and the disaster tolerance UPF may also obtain the IP addresses of the group of UPFs in the local configuration manner.

S660, the SMF selects a first UPF from the multiple UPFs according to the first UPF identifier received in the above step, and sends a session establishment request message to the first UPF, where the request message carries the second IP address allocated by the first terminal device and the local traffic offload rule, and then the first UPF may issue a high-priority user route.

S670, the first UPF returns a session establishment response message to the SMF, and optionally, when the F-TEID is allocated by the first UPF, the response message may carry the F-TEID of the allocated terminal device.

S680, the SMF sends a N1N 2 information transfer (message transfer) message to the AMF, wherein N1 message is sent to the terminal equipment and used for informing the UE of a default Qos rule (rule), a second IP address allocated to the terminal equipment and the like, N2 message is sent to the RAN side and used for informing the RAN side of the selected first UPF tunnel address and the corresponding F-TEID of the terminal equipment, namely uplink channel information, QOS flow and the like, and the AMF mainly performs information transfer in the step.

S690, the AMF sends a request message of N2 PDU session to the RAN side, the AMF sends a NAS message and the like to the RAN side, wherein the NAS message comprises PDU session ID of the terminal equipment and received by PUD session establishment, and the NAS message also carries the N2 message in the previous step.

S6100, the RAN side issues AN-specific signaling exchange to the UE related to the information received from the SMF. S6110, the RAN sends an N2 PDU session response message to the SMF, where the response message may include channel information (tunnel information) of the RAN, that is, a downlink access network address of the N3 channel corresponding to the PDU session, and the channel information of the RAN is determined by the RAN side. And step S6110, the data uplink channel is opened.

S6120, the AMF sends update (update) request information to the SMF, where the information may include the channel information of the AN. S6130, the SMF sends a N4 session modification request message to the disaster tolerant UPF, where the message may carry a corresponding forwarding rule and the channel information of the RAN side, and optionally, if the F-TEID of the terminal device is allocated by the first UPF, the message may also carry the channel information of the local side allocated by the first UPF, and the channel information of the local side may include the tunnel address of the first UPF and the F-TEID of the terminal device. S6140, the disaster tolerant UPF sends an N4 session modification response message to the SMF. S6150, the SMF sends a N4 session modification request message to the selected first UPF, where the message may carry a corresponding forwarding rule and the channel information of the RAN side. S6160, the selected first UPF sends an N4 session modification response message. At this point, the downlink data is also opened.

After the user activation is successful, when the first UPF works normally, the uplink transmission path of the data is RAN- > UPF- > DN, and the downlink transmission path is DN- > UPF- > AN. Fig. 7 shows the uplink and downlink paths of data when the UPF is operating normally in the prior art. As shown in fig. 7, in the uplink path, after an uplink packet sent by the UE reaches the RAN side, the RAN side discards the data packet to a corresponding data route according to the uplink channel information in the N2 message obtained in S690 in fig. 6, when the first UPF normally works, the high priority user route issued by the first UPF is valid, so that the data packet reaches the N3 logical interface of the corresponding selected UPF through the high priority user route, then, the first UPF removes the IP header belonging to the first UPF of the data packet, only retains the destination IP accessed by the user, and after the UPF forwards the data packet with the IP address removed, the data packet reaches the data network DN corresponding to the destination IP, and the uplink is terminated.

In the downlink path, the data network sends a downlink packet, where the downlink packet carries the second IP address of the terminal device, the data packet reaches the first UPF through the high-priority user route of the first UPF, and the first UPF seals the IP header of the first UPF to the data packet, and reaches the RAN according to the RAN channel information in step S6110 in fig. 6.

In the communication process, heartbeat messages are kept between the disaster recovery UPF and the UPF and between the SMF and the UPF, and whether the UPF has a fault or not is confirmed according to the heartbeat messages. Fig. 8 shows a schematic diagram of a UPF fault detection and recovery process in the embodiment of the present application, as shown in fig. 8, S810, data transmission before a UPF fault, where the data transmission process is shown in fig. 7, and repeated details are not repeated here. And S820, the disaster recovery UPF sends an N4 heartbeat request message to the UPF. S830, the UPF sends a N4 heartbeat response message to the disaster recovery UPF, and the disaster recovery UPF confirms the UPF alive according to the heartbeat response message, optionally, in this step, the SMF may also send a heartbeat request message to the UPF, and the specific steps refer to the schematic diagram of the UPF fault recovery flow in the prior art shown in fig. 2. And S840, the UPF is failed. And S850, the disaster recovery UPF sends an N4 heartbeat request message to the UPF, and the request message is used for confirming whether the UPF is recovered to be normal or not. S860, when the UPF is still in the failure state, the low-priority user route of the disaster recovery UPF takes effect, where the low-priority user route may be issued by the disaster recovery UPF in the activation process in fig. 6, or the low-priority user route may also be issued in this step.

S870, perform data transmission in the UPF fault, where the transmission path in the fault is: RAN- > disaster recovery UPF- > DN is transmitted in an uplink mode, and DN- > disaster recovery UPF- > RAN is transmitted in a downlink mode. Fig. 9 shows a schematic diagram of transmitting data through a disaster tolerant UPF in a UPF fault according to the embodiment of the present application, as shown in fig. 9, when the UPF has a fault, a high-priority user route of the UPF fails, and a data packet is transmitted through the disaster tolerant UPF, where in an uplink transmission process, after receiving an uplink packet of a UE, a RAN discards the data packet to a corresponding user route according to uplink channel information obtained in S690 in fig. 6, and at this time, the high-priority user route of the UPF fails, so that the data packet is transmitted to an N3 logical interface of the disaster tolerant UPF through a low-priority user route issued by the disaster tolerant UPF. And when the data message reaches the disaster tolerance UPF, the disaster tolerance UPF also cuts off the UPF IP head of the data message, then discards the data message with the reserved access destination IP address, and the data message reaches the data network DN according to the access destination IP address. Optionally, if the packet carries an identifier such as QFI, a special process without packet loss is required in the disaster recovery UPF-C data transmission, so as to ensure that the service flow is not damaged and the service is not interrupted.

Correspondingly, in the downlink data transmission, the DN sends a data packet carrying the IP address of the terminal device, the data packet reaches the disaster recovery UPF through the low-priority user route, the disaster recovery UPF encapsulates the UPF IP on the IP header of the data packet, and forwards the data packet to the RAN side according to the RAN channel information in step S6110 in fig. 6, and then reaches the corresponding UE through the AN side.

S880, the user context is restored, where in S880a, the UPF sends a heartbeat response message to the disaster recovery UPF, and the disaster recovery UPF confirms that the UPF has recovered to normal, optionally, the UPF may also send a heartbeat response message to the SMF, and the SMF confirms that the UPF has recovered to normal; s880b, the SMF or disaster tolerant UPF restores user data to the UPF, which may include F-TEID, SM policy, tunnel information set, etc. Optionally, the SMF may initiate an activation process to the UPF according to steps S660 and S670 in fig. 6, and send the user data to the UPF, or the SMF may encapsulate the user context information (optionally, the context information may be a table) in a private data encapsulation format, interact with the user, and recover the data of the user; or the user data can be recovered from the UPF through the disaster recovery UPF, and the disaster recovery UPF can package the user context information (optionally, the context information may be a table) through a private data packaging format, interact with the user, and recover the user data. It should be understood that when the user data recovery is performed on the UPF through the SMF or the disaster tolerant UPF, the SMF or the disaster tolerant UPF stores therein the user data information. And the SMF or the disaster tolerance UPF recovers the user data of the UPF until all the user data are recovered. S890, the SMF or disaster tolerant UPF notifies the UPF of the completion of the information recovery, and the UPF issues a high priority user route and N3 logical interface, it being understood that the user route and logical interface are the same as before the UPF failure. S8100, after the high-priority user route is released, the UPF recovers the data transmission, and the transmission path is changed into: the uplink RAN- > UPF- > DN and the downlink is DN- > UPF- > RAN. The transmission process is the same as the foregoing process, and is not described herein again.

Fig. 10 shows a schematic diagram of a communication apparatus according to an embodiment of the present application, and the apparatus 1000 includes an obtaining module 1100 and a sending module 1200.

The acquisition module is used for acquiring a first network protocol IP address of a first user plane function UPF; the sending module is configured to issue first routing information of a disaster recovery UPF to a first routing network, where the first routing network is a routing network between an access network and a core network, the first routing information corresponds to the first IP address, a priority of the first routing information is lower than a priority of second routing information, the second routing information is uplink routing information of the first UPF, and the second routing information corresponds to the first IP address.

Optionally, the first routing information further includes a tunnel endpoint identifier of a first terminal device served by the first UPF, and the apparatus further includes: the receiving module is configured to receive first information sent by a session management function SMF, where the first information includes a tunnel endpoint identifier of the first terminal device.

Optionally, the obtaining module is further configured to: acquiring third information, wherein the third information is used for indicating an IP address field corresponding to each UPF in a plurality of UPFs; the receiving module is further configured to receive fourth information sent by the SMF, where the fourth information includes a second IP address of the first terminal device; the sending module is further configured to: and sending fifth information to the SMF, where the fifth information includes an identifier of the first UPF, and the second IP address belongs to an IP address segment corresponding to the first UPF, so that the SMF determines the first UPF as a service UPF of the first terminal device according to the fifth information.

Optionally, the obtaining module is further configured to: acquiring sixth information, wherein the sixth information is used for indicating an IP address field corresponding to each UPF in a plurality of UPFs; the device further comprises: the processing module is used for distributing the second IP address for the first terminal equipment; the sending module is further configured to: and sending seventh information to the SMF, where the seventh information includes an identifier of the first UPF, and the second IP address belongs to an IP address segment corresponding to the first UPF, so that the SMF determines the first UPF as the service UPF of the first terminal device according to the seventh information.

Optionally, the apparatus further comprises: and the data recovery module is used for recovering the user data to the first UPF in a private data packaging mode after the first UPF is recovered from the fault.

Optionally, the heartbeat message is maintained between and when the disaster recovery UPF and the first UPF operate normally.

Fig. 11 is a schematic diagram of another communication apparatus according to an embodiment of the present application, where the apparatus 1100 includes an obtaining module 1110 and a sending module 1120.

The acquisition module is used for acquiring a second network protocol IP address of the first terminal equipment of the first user plane function UPF service; the sending module is configured to issue third routing information of the disaster recovery UPF to a second routing network, where the second routing network is a routing network between a core network and a data network, the third routing information corresponds to the second IP address, a priority of the third routing information is lower than a priority of fourth routing information, the fourth routing information is downlink routing information of the first UPF, and the fourth routing information corresponds to the second IP address.

Optionally, the apparatus further comprises: a receiving module, configured to receive second information sent by a session management function SMF, where the second information includes channel information of an access network, and the sending module is further configured to: and sending downlink data to the first terminal equipment according to the channel information.

Fig. 12 shows a schematic diagram of another communication apparatus according to an embodiment of the present application, where the apparatus 1200 includes a sending module 1210 and a receiving module 1220.

The sending module is configured to send first activation request information to a disaster tolerance user plane function UPF, where the first activation request information is used to request activation of a first terminal device, the disaster tolerance UPF is used to obtain a first network protocol IP address of the first UPF, and to issue first routing information of the disaster tolerance UPF to a first routing network, the first routing network is a routing network between an access network and a core network, the first routing information corresponds to the first IP address, a priority of the first routing information is lower than a priority of second routing information, the second routing information is uplink routing information of the first UPF, the second routing information corresponds to the first IP address, or the disaster tolerance UPF is used to obtain a second IP address of a first terminal device served by the first UPF, the disaster tolerance UPF issues third routing information of the disaster tolerance UPF to a second routing network, the second routing network is a routing network between a core network and a data network, the third routing information corresponds to the second IP address, the priority of the third routing information is lower than that of fourth routing information, the fourth routing information is downlink routing information of the first UPF, the fourth routing information corresponds to the second IP address, and the second IP address of the first terminal device belongs to the IP address segment corresponding to the first UPF; the receiving module is configured to receive first response information sent by the disaster recovery UPF, where the response information includes an identifier of the first UPF, and a second IP address of the first terminal device belongs to an IP address segment corresponding to the first UPF; the sending module is further configured to: sending a second activation request to the first UPF according to the first response information, wherein the second activation request information is used for requesting to activate the first terminal equipment; the receiving module is further configured to: receiving second response information sent by the first UPF, wherein the second response information comprises the first IP address; the sending module is further configured to: sending a third activation request message to the disaster recovery UPF, where the third activation request message includes channel information of an access network, and the channel information is used for downlink data transmission of the disaster recovery UPF; the receiving module is further configured to: receiving a third response message sent by the disaster recovery UPF, wherein the third response message is used for indicating that the disaster recovery UPF downlink channel is opened; the sending module is further configured to: sending a fourth activation request to the first UPF, wherein the fourth activation request message includes channel information of the access network, and the channel information is used for downlink data transmission of the first UPF; the receiving module is further configured to: and receiving a fourth response message sent by the first UPF, wherein the fourth response message is used for indicating that the first UPF downlink channel is opened.

Optionally, the apparatus further comprises: the processing module is used for distributing an IP address for the first terminal equipment; and the first activation request information further includes the second IP address of the first terminal device.

Optionally, when the IP address of the first terminal device is the disaster recovery UPF allocation, the first response information further includes the IP address of the first terminal device.

Optionally, when the tunnel endpoint identifier of the first terminal device is allocated by the first UPF, the second response message and the third activation request message further include the tunnel endpoint identifier of the first terminal device.

Optionally, the apparatus further comprises:

and the data recovery module is used for recovering the user data to the first UPF in a private data packaging mode after the first UPF is recovered from the fault.

In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is only one logical functional division, and other divisions may be realized in practice.

The method in the embodiments of the present application, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium, and based on such understanding, the technical solution or parts of the technical solution in the present application may be embodied in the form of a software product stored in a storage medium, and including several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method in the embodiments of the present application. The storage medium includes at least: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk. The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of communication, comprising:

a disaster tolerance user plane function UPF acquires a first network protocol IP address of a first UPF;

the method comprises the steps that a disaster recovery UPF issues first routing information of the disaster recovery UPF to a first routing network, wherein the first routing network is a routing network between an access network and a core network, the first routing information corresponds to a first IP address, the priority of the first routing information is lower than that of second routing information, the second routing information is uplink routing information of the first UPF, and the second routing information corresponds to the first IP address.

2. The method of claim 1, wherein the first routing information further comprises a tunnel endpoint identifier for a first terminal device served by the first UPF, and wherein

The method further comprises the following steps:

and the disaster tolerance UPF receives first information sent by a Session Management Function (SMF), wherein the first information comprises a tunnel endpoint identifier of the first terminal equipment.

3. A method of communication, comprising:

a disaster tolerance User Plane Function (UPF) acquires a second network protocol (IP) address of a first terminal device served by the first UPF;

the disaster recovery UPF issues third routing information of the disaster recovery UPF to a second routing network, where the second routing network is a routing network between a core network and a data network, the third routing information corresponds to the second IP address, a priority of the third routing information is lower than a priority of fourth routing information, the fourth routing information is downlink routing information of the first UPF, and the fourth routing information corresponds to the second IP address.

4. The method of claim 3, further comprising:

the disaster tolerance UPF receives second information sent by a session management function SMF, where the second information includes channel information of an access network, and the method further includes:

and the disaster recovery UPF sends downlink data to the first terminal equipment according to the channel information.

5. The method according to any one of claims 1 to 4, further comprising:

the disaster tolerance UPF acquires third information, wherein the third information is used for indicating an IP address segment corresponding to each UPF in a plurality of UPFs;

the disaster tolerance UPF receives fourth information sent by the SMF, wherein the fourth information comprises a second IP address of the first terminal equipment;

and the disaster recovery UPF sends fifth information to the SMF, where the fifth information includes an identifier of the first UPF, and the second IP address belongs to an IP address segment corresponding to the first UPF, so that the SMF determines the first UPF as a service UPF of the first terminal device according to the fifth information.

6. The method according to any one of claims 1 to 4, further comprising:

the disaster tolerance UPF acquires sixth information, wherein the sixth information is used for indicating an IP address segment corresponding to each UPF in the plurality of UPFs;

the disaster tolerance UPF allocates the second IP address to the first terminal equipment;

and the disaster recovery UPF sends seventh information to the SMF, where the seventh information includes an identifier of the first UPF, and the second IP address belongs to an IP address segment corresponding to the first UPF, so that the SMF determines the first UPF as the service UPF of the first terminal device according to the seventh information.

7. The method according to any of claims 1-6, wherein the disaster tolerant UPF recovers user data to the first UPF by way of private data encapsulation when the first UPF is recovered from the failure.

8. The method according to any of claims 1-7, wherein heartbeat messages are maintained between the first UPF and the disaster tolerant UPF while the first UPF is operating normally.

9. A method of communication, comprising:

a session management function SMF sends a first activation request message to a disaster recovery user plane function UPF, where the first activation request message is used to request activation of a first terminal device, the disaster recovery UPF is used to obtain a first network protocol IP address of the first UPF, and to issue a first routing message of the disaster recovery UPF to a first routing network, the first routing network is a routing network between an access network and a core network, the first routing message corresponds to the first IP address, and the priority of the first routing message is lower than that of a second routing message, the second routing message is an uplink routing message of the first UPF, and the second routing message corresponds to the first IP address, or the disaster recovery UPF is used to obtain a second IP address of a first terminal device served by the first UPF, and to issue a third routing message of the disaster recovery UPF to the second routing network, the second routing network is a routing network between a core network and a data network, the third routing information corresponds to the second IP address, the priority of the third routing information is lower than that of fourth routing information, the fourth routing information is downlink routing information of the first UPF, the fourth routing information corresponds to the second IP address, and the second IP address of the first terminal device belongs to the IP address segment corresponding to the first UPF;

the SMF receives first response information sent by the disaster recovery UPF, wherein the response information comprises an identifier of the first UPF;

the SMF sends a second activation request to the first UPF according to the first response information, wherein the second activation request information is used for requesting to activate the first terminal equipment;

the SMF receives second response information sent by the first UPF, wherein the second response information comprises the first IP address;

the SMF sends third activation request information to the disaster recovery UPF, wherein the third activation request information comprises channel information of an access network, and the channel information is used for downlink data transmission of the disaster recovery UPF;

the SMF receives third response information sent by the disaster tolerant UPF, wherein the third response information is used for indicating that a downlink channel of the disaster tolerant UPF is opened;

the SMF sends fourth activation request information to the first UPF, wherein the fourth activation request information comprises channel information of the access network, and the channel information is used for downlink data transmission of the first UPF;

and the SMF receives fourth response information sent by the first UPF, wherein the fourth response information is used for indicating that the first UPF downlink channel is opened.

10. The method of claim 9, wherein the first activation request message further includes a second IP address of the first terminal device when the IP address of the first terminal device is assigned by the SMF.

11. The method according to claim 9, wherein when the IP address of the first terminal device is the disaster recovery UPF assignment, the first response message further includes a second IP address of the first terminal device.

12. The method according to any of claims 9-11, wherein the second response information and the third activation request information further comprise a tunnel endpoint identifier of the first terminal device when the tunnel endpoint identifier of the first terminal device is assigned by the first UPF.

13. The method according to any one of claims 9-12, further comprising:

and after the first UPF is recovered from the fault, the SMF recovers the user data to the first UPF in a private data packaging mode.

14. A communications apparatus, comprising:

the acquisition module is used for acquiring a first network protocol IP address of a first user plane function UPF;

a sending module, configured to issue first routing information of a disaster recovery UPF to a first routing network, where the first routing network is a routing network between an access network and a core network, the first routing information corresponds to the first IP address, a priority of the first routing information is lower than a priority of second routing information, the second routing information is uplink routing information of the first UPF, and the second routing information corresponds to the first IP address.

15. The apparatus of claim 14, wherein the first routing information further comprises a tunnel endpoint identifier for a first terminal device served by the first UPF, and wherein

The device further comprises:

a receiving module, configured to receive first information sent by an access and mobility management function SMF, where the first information includes a tunnel endpoint identifier of the first terminal device.

16. A communications apparatus, comprising:

the acquisition module is used for acquiring a second network protocol IP address of the first terminal equipment served by the first session management function UPF;

a sending module, configured to issue third routing information of a disaster recovery UPF to a second routing network, where the second routing network is a routing network between a core network and a data network, the third routing information corresponds to the second IP address, a priority of the third routing information is lower than a priority of fourth routing information, the fourth routing information is downlink routing information of the first UPF, and the fourth routing information corresponds to the second IP address.

17. The apparatus of claim 16, further comprising:

a receiving module, configured to receive second information sent by a session management function SMF, where the second information includes channel information of an access network;

the sending module is further configured to:

and sending downlink data to the first terminal equipment according to the channel information.

18. The apparatus of any one of claims 14-17, wherein the obtaining module is further configured to:

acquiring third information, wherein the third information is used for indicating an IP address field corresponding to each UPF in a plurality of UPFs;

a receiving module, configured to receive fourth information sent by an SMF, where the fourth information includes a second IP address of the first terminal device;

the sending module is further configured to:

and sending fifth information to the SMF, where the fifth information includes an identifier of the first UPF, and the second IP address belongs to an IP address segment corresponding to the first UPF, so that the SMF determines the first UPF as a service UPF of the first terminal device according to the fifth information.

19. The apparatus of any one of claims 14-17, wherein the obtaining module is further configured to:

acquiring sixth information, wherein the sixth information is used for indicating an IP address field corresponding to each UPF in a plurality of UPFs;

the device further comprises:

the processing module is used for distributing the second IP address for the first terminal equipment;

the sending module is further configured to:

and sending seventh information to the SMF, where the seventh information includes an identifier of the first UPF, and the second IP address belongs to an IP address segment corresponding to the first UPF, so that the SMF determines the first UPF as the service UPF of the first terminal device according to the seventh information.

20. The apparatus according to any one of claims 14-19, further comprising:

21. The apparatus according to any of claims 14-20, wherein the heartbeat message is maintained between and when the disaster tolerant UPF and the first UPF are operating normally.

22. A communications apparatus, comprising:

a sending module, configured to send first activation request information to a disaster tolerance user plane function UPF, where the first activation request information is used to request activation of a first terminal device, and the disaster tolerance UPF is used to obtain a first network protocol IP address of the first UPF and issue first routing information of the disaster tolerance UPF to a first routing network, the first routing network is a routing network between an access network and a core network, the first routing information corresponds to the first IP address, and a priority of the first routing information is lower than a priority of second routing information, the second routing information is uplink routing information of the first UPF, and the second routing information corresponds to the first IP address, or the disaster tolerance UPF is used to obtain a second IP address of a first terminal device served by the first UPF and issue third routing information of the disaster tolerance UPF to the second routing network, the second routing network is a routing network between a core network and a data network, the third routing information corresponds to the second IP address, the priority of the third routing information is lower than that of fourth routing information, the fourth routing information is downlink routing information of the first UPF, the fourth routing information corresponds to the second IP address, and the second IP address of the first terminal device belongs to the IP address segment corresponding to the first UPF;

a receiving module, configured to receive first response information sent by the disaster recovery UPF, where the response information includes an identifier of the first UPF, and a second IP address of the first terminal device belongs to an IP address segment corresponding to the first UPF;

the sending module is further configured to: sending a second activation request to the first UPF according to the first response information, wherein the second activation request information is used for requesting to activate the first terminal equipment;

the receiving module is further configured to: receiving second response information sent by the first UPF, wherein the second response information comprises the first IP address;

the sending module is further configured to: sending a third activation request message to the disaster recovery UPF, where the third activation request message includes channel information of an access network, and the channel information is used for downlink data transmission of the disaster recovery UPF;

the receiving module is further configured to: receiving a third response message sent by the disaster recovery UPF, wherein the third response message is used for indicating that the disaster recovery UPF downlink channel is opened;

the sending module is further configured to: sending a fourth activation request to the first UPF, wherein the fourth activation request message includes channel information of the access network, and the channel information is used for downlink data transmission of the first UPF;

the receiving module is further configured to: and receiving a fourth response message sent by the first UPF, wherein the fourth response message is used for indicating that the first UPF downlink channel is opened.

23. The apparatus of claim 22, further comprising:

the processing module is used for distributing an IP address for the first terminal equipment; and

the first activation request information further includes the second IP address of the first terminal device.

24. The apparatus according to claim 22, wherein the first response message further includes the IP address of the first terminal device when the IP address of the first terminal device is the disaster recovery UPF assignment.

25. The apparatus according to any of claims 22-24, wherein the second response message and the third activation request message further comprise a tunnel endpoint identifier of the first terminal device when the tunnel endpoint identifier of the first terminal device is assigned by the first UPF.

26. The apparatus according to any one of claims 22-25, further comprising:

27. A communications apparatus, comprising:

means for implementing the method of any one of claims 1-2, 5-8; or

Means for implementing the method of any one of claims 3-8; or

Means for implementing the method of any one of claims 9-13.

28. A computer-readable storage medium, having stored thereon a computer program which, when executed,

causing an apparatus to perform the method of any one of claims 1-2, 5-8; or

Causing an apparatus to perform the method of any one of claims 3-8; or

Causing an apparatus to perform the method of any one of claims 9-13.

29. A chip system, comprising: a processor for calling and running the computer program from the memory,

causing a communication device on which the chip system is installed to perform the method of any one of claims 1-2, 5-8; or

Causing a communication device on which the chip system is installed to perform the method of any one of claims 3-8; or

Causing a communication device on which the chip system is mounted to perform the method of any one of claims 9-13.