WO2021196962A1

WO2021196962A1 - Communication method and communication device

Info

Publication number: WO2021196962A1
Application number: PCT/CN2021/078874
Authority: WO
Inventors: 陈曦; 夏渊; 钱宏
Original assignee: 华为技术有限公司
Priority date: 2020-03-30
Filing date: 2021-03-03
Publication date: 2021-10-07
Also published as: CN113473508A; CN113473508B

Abstract

The present application provides a communication method and a communication device. The method comprises: a disaster-tolerant user plane function (UPF) obtains a first interworking protocol (IP) address of a first UPF; and the disaster-tolerant UPF publishes first routing information of the disaster-tolerant UPF to a first routing network, the first routing network being a routing network between an access network and a core network, the first routing information corresponding to the first IP address, the priority of the first routing information being lower than the priority of second routing information, the second routing information being uplink routing information of the first UPF, and the second routing information corresponding to the first IP address. By means of the method provided in the present application, when a fault occurs in a UPF and routing fails, a terminal device can transmit, by means of routing switching, data by using low-priority routing published by the disaster-tolerant UPF, thus avoiding the interruption of service transmission, thereby guaranteeing the continuity of service transmission.

Description

Communication method and communication device

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 202010236478.X, and the application name is "a communication method and communication device" on March 30, 2020. The entire content is incorporated herein by reference. Applying.

Technical field

The present application relates to the field of communication, and more specifically, to a communication method and communication device.

Background technique

At present, the fifth-generation mobile communication technology (5th-generation, 5G) is in a period of vigorous development. The 5G wireless communication core network includes the following functions: user plane function (UPF); access and mobility management functions ( access and mobility management function, AMF); session management function (session management function, SMF) and other functions. A user terminal (user equipment, UE) needs to access the UPF of the 5G core network through a radio access network (access network, AN), so that it can access the data network (DN). UPF can also be called UPF entity or network element UPF, which is also applicable to network element SMF and network element AMF. The network element SMF controls the selection and access of UPF. The SMF manages one or more UPFs, and the UE can access and connect to the UPF through the internet protocol (Internet protocol) IP address.

In the prior art, when the UPF fails, the UPF will lose all user contexts. During the recovery process, the user's service transmission will be interrupted, and end-to-end awareness is required during the session recovery process of the UPF, and there will be a lot of signaling. The impact will exert greater pressure on the network.

Summary of the invention

This application provides a communication method. Disaster-tolerant UPF publishes low-priority user routes, so that when the UPF fails and the high-priority user routes advertised by it become invalid, the terminal device can use the route conversion and use the disaster-tolerant UPF to publish the routes. Low-priority users route and transmit data, thereby solving the problem of interruption of service transmission when UPF fails, thereby ensuring the continuity of service transmission.

In a first aspect, a communication method is provided, the method includes: a disaster-tolerant user plane function UPF obtains a first network protocol IP address of a first UPF; and the disaster-tolerant UPF publishes the disaster-tolerant UPF to a first routing network The first routing information, 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 the priority of the first routing information Lower than the priority of the second routing information, the second routing information is the uplink routing information of the first UPF, and the second routing information corresponds to the first IP address.

By publishing the first routing information corresponding to the first UPF to the routing network, when the first UPF fails and the second routing information of the first UPF becomes invalid, the uplink data can be routed, using the first UPF of the disaster-tolerant UPF. The routing information is used for data transmission, thereby avoiding interruption of service transmission and ensuring the continuity of service transmission.

With reference to the first aspect, in some implementations of the first aspect, the first routing information further includes the tunnel endpoint identifier of the first terminal device served by the first UPF, and the method further includes: the content The disaster UPF receives the first information sent by the session management function SMF, where the first information includes the tunnel endpoint identifier of the first terminal device.

With reference to the first aspect, in some implementations of the first aspect, the method further includes: the disaster tolerance UPF acquiring third information, where the third information is used to indicate that each of the multiple UPFs corresponds to IP address segment; receiving fourth information sent by SMF, the fourth information including the second IP address of the first terminal device; sending fifth information to the SMF, the fifth information including the first UPF , Wherein the second IP address belongs to the IP address segment corresponding to the first UPF, so that the SMF can determine the first UPF as the first terminal device’s Service UPF.

With reference to the first aspect, in some implementations of the first aspect, the method further includes: the disaster-tolerant UPF acquiring sixth information, where the sixth information is used to indicate that each of the multiple UPFs corresponds to IP address segment; assign the second IP address to the first terminal device; send seventh information to the SMF, where the seventh information includes the identifier of the first UPF, where the second IP address belongs to all The IP address segment corresponding to the first UPF is 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 first UPF is restored from a failure, the disaster-tolerant UPF restores user data to the first UPF by way of private data encapsulation.

The disaster recovery UPF restores user data to the first UPF. During the restoration process, only the information exchange between the SMF and the UPF is required, and the surrounding network elements have no perception, thereby reducing end-to-end perception and avoiding signaling impact.

With reference to the first aspect, in some implementation manners of the first aspect, a heartbeat message is maintained between the first UPF and the disaster-tolerant UPF when the first UPF is working normally.

In a second aspect, a communication method is provided, the method includes: a disaster-tolerant user plane function UPF obtains a second network protocol IP address of a first terminal device served by a first UPF; Publish the third routing information of the disaster-tolerant UPF, 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, and the third The priority of the routing information is lower than the priority of the fourth routing information, the fourth routing information is the downlink routing information of the first UPF, and the fourth routing information corresponds to the second IP address.

By publishing the third routing information corresponding to the first UPF to the routing network, when the first UPF fails and the fourth routing information of the first UPF becomes invalid, the downstream data can be routed converted, and the third routing information of the disaster-tolerant UPF can be used. The routing information is used for data transmission, thereby avoiding interruption of service transmission and ensuring the continuity of service transmission.

With reference to the second aspect, in some implementations of the second aspect, the method further includes: the disaster tolerance UPF receiving second information sent by the session management function SMF, the second information including channel information of the access network The method further includes: the disaster tolerance UPF sending downlink data to the first terminal device according to the channel information.

With reference to the second aspect, in some implementations of the second aspect, the method further includes: the disaster tolerance UPF acquiring third information, where the third information is used to indicate the corresponding UPF of each of the multiple UPFs IP address segment; receiving fourth information sent by SMF, the fourth information including the second IP address of the first terminal device; sending fifth information to the SMF, the fifth information including the first UPF , Wherein the second IP address belongs to the IP address segment corresponding to the first UPF, so that the SMF can determine the first UPF as the first terminal device’s Service UPF.

With reference to the second aspect, in some implementations of the second aspect, the method further includes: the disaster tolerance UPF acquiring sixth information, where the sixth information is used to indicate the corresponding UPF of each of the multiple UPFs IP address segment; assign the second IP address to the first terminal device; send seventh information to the SMF, where the seventh information includes the identifier of the first UPF, where the second IP address belongs to all The IP address segment corresponding to the first UPF is 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 restored, the disaster-tolerant UPF restores user data to the first UPF by way of private data encapsulation.

With reference to the second aspect, in some implementation manners of the second aspect, a heartbeat message is maintained between the first UPF and the disaster-tolerant UPF when the first UPF is working normally.

In a third aspect, a communication method is provided, the method includes: a session management function SMF sends first activation request information to a disaster tolerance user name function UPF, where the first activation request information is used to request activation of a first terminal device, Wherein, the disaster recovery UPF is used to obtain the first network protocol IP address of the first UPF, and publish the first routing information of the disaster recovery UPF to the first routing network, and the first routing network is an access network and A routing network between core networks, the first routing information corresponds to the first IP address, and the priority of the first routing information is lower than the priority of the second routing information, and the second routing information is The uplink routing information of the first UPF, the second routing information corresponds to the first IP address, or the disaster recovery UPF is used to obtain the second IP address of the first terminal device served by the first UPF , And publish the third routing information of the disaster-tolerant UPF to a second routing network, where the second routing network is a routing network between a core network and a data network, and the third routing information is related to the second IP address Corresponding, and the priority of the third routing information is lower than the priority of the fourth routing information, the fourth routing information is the downlink routing information of the first UPF, and the fourth routing information is the same as the second routing information. IP address correspondence, wherein the second IP address of the first terminal device belongs to the IP address segment corresponding to the first UPF; the SMF receives the first response information sent by the disaster recovery UPF, and the response information includes The identifier of the first UPF; the SMF sends a second activation request to the first UPF according to the first response information, and the second activation request information is used to request activation of the first terminal device; the SMF Receiving second response information sent by the first UPF, where the second response information includes the first IP address; the SMF sends third activation request information to the disaster recovery UPF, the third activation request information Including channel information of the access network, the channel information is used for the downlink data transmission of the disaster-tolerant UPF; the SMF receives the third response information sent by the disaster-tolerant UPF, and the third response information is used to indicate the The disaster recovery UPF downlink channel has been opened; the SMF sends fourth activation request information to the first UPF, the fourth activation request information includes channel information of the access network, and the channel information is used for the Downlink data transmission of the first UPF; the SMF receives fourth response information sent by the first UPF, where the fourth response information is used to indicate that the downlink channel of the first UPF has been opened.

SMF activates the same user in the first UPF and disaster-tolerant UPF respectively, so that when the first UPF fails and its routing fails, it can use the first routing information and the third routing information released by the disaster-tolerant UPF through route conversion. Realize data transmission, thereby avoiding the interruption of data transmission and ensuring the continuity of service transmission.

With reference to the third aspect, in some 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 the The second IP address.

With reference to the third aspect, in some implementation manners of the third aspect, when the IP address of the first terminal device is allocated by the disaster tolerance UPF, the first response information further includes the The second IP address.

With reference to the third aspect, in some 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 The information also includes the tunnel endpoint identifier of the first terminal device.

With reference to the third aspect, in some implementation manners of the third aspect, the method further includes: after the first UPF failure is restored, the SMF restores user data to the first UPF by way of private data encapsulation .

To restore user data to the first UPF through SMF, only information exchange between SMF and UPF is required during the restoration process, and peripheral network elements are not aware, thereby reducing end-to-end perception and avoiding signaling impact.

In a fourth aspect, a communication device is provided. The device includes: an acquisition module, configured to acquire a first network protocol IP address of a first user plane function UPF; and a sending module, configured to publish a disaster-tolerant UPF to a first routing network The first routing information, 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 the priority of the first routing information Lower than the priority of the second routing information, the second routing information is the 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 the tunnel endpoint identifier of the first terminal device served by the first UPF, and the apparatus further includes: a receiving module, It is used to receive the first information sent by the session management function SMF, where the first information includes the tunnel endpoint identifier of the first terminal device.

With reference to the fourth aspect, in some implementations of the fourth aspect, the acquiring module is further configured to: acquire third information, where the third information is used to indicate the IP address segment corresponding to each UPF of the multiple UPFs The receiving module is also used to receive fourth information sent by SMF, the fourth information includes the second IP address of the first terminal device; the sending module is also used to: send fifth information to the SMF , The fifth information includes the identifier of the first UPF, wherein the second IP address belongs to the IP address segment corresponding to the first UPF, so that the SMF can combine the The first UPF is determined to be the serving UPF of the first terminal device.

With reference to the fourth aspect, in some implementations of the fourth aspect, the acquiring module is further configured to: acquire sixth information, where the sixth information is used to indicate the IP address segment corresponding to each UPF of the multiple UPFs The device further includes: a processing module, configured to allocate the second IP address to the first terminal device; the sending module is also configured to: send seventh information to the SMF, the seventh information includes the The identifier of the first UPF, where the second IP address belongs to the IP address segment corresponding to the first UPF, so that the SMF can determine the first UPF as the first UPF according to the seventh information. Service UPF for terminal equipment.

With reference to the fourth aspect, in some implementation manners of the fourth aspect, the device further includes: a data recovery module, configured to send a private data encapsulation method to the first UPF after the failure of the first UPF is recovered. Restore user data.

With reference to the fourth aspect, in some implementation manners of the fourth aspect, heartbeat messages are maintained during and between the disaster recovery UPF and the first UPF during normal operation.

In a fifth aspect, a communication device is provided. The device includes: an acquisition module, configured to acquire a second network protocol IP address of a first terminal device served by a first user plane function UPF; and a sending module, configured to send a second The routing network publishes the third routing information of the disaster-tolerant UPF, 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 third The priority of the routing information is lower than the priority of the fourth routing information, the fourth routing information is the 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 some implementations of the fifth aspect, the device further includes: a receiving module, configured to receive second information sent by the session management function SMF, where the second information includes channel information of the access network The sending module is further configured to send downlink data to the first terminal device according to the channel information.

With reference to the fifth aspect, in some implementations of the fifth aspect, the obtaining module is further configured to: obtain third information, where the third information is used to indicate the IP address segment corresponding to each UPF of the plurality of UPFs The receiving module is also used to receive fourth information sent by SMF, the fourth information includes the second IP address of the first terminal device; the sending module is also used to: send fifth information to the SMF , The fifth information includes the identifier of the first UPF, wherein the second IP address belongs to the IP address segment corresponding to the first UPF, so that the SMF can combine the The first UPF is determined to be the serving UPF of the first terminal device.

With reference to the fifth aspect, in some implementations of the fifth aspect, the acquiring module is further configured to: acquire sixth information, where the sixth information is used to indicate the IP address segment corresponding to each UPF of the multiple UPFs The device further includes: a processing module, configured to allocate the second IP address to the first terminal device; the sending module is also configured to: send seventh information to the SMF, the seventh information includes the The identifier of the first UPF, where the second IP address belongs to the IP address segment corresponding to the first UPF, so that the SMF can determine the first UPF as the first UPF according to the seventh information. Service UPF for terminal equipment.

With reference to the fifth aspect, in some implementation manners of the fifth aspect, the device further includes: a data recovery module, configured to send a private data encapsulation method to the first UPF after the failure of the first UPF is recovered. Restore user data.

With reference to the fifth aspect, in some implementation manners of the fifth aspect, heartbeat messages are maintained during and between the disaster recovery UPF and the first UPF during normal operation.

In a sixth aspect, a communication device is provided, the device comprising: a sending module, configured to send first activation request information to a disaster-tolerant user plane function UPF, where the first activation request information is used to request activation of a first terminal device , Wherein the disaster tolerance UPF is used to obtain the first network protocol IP address of the first UPF and publish the first routing information of the disaster tolerance UPF to the first routing network, and the first routing network is the access network and the core In a routing network between networks, the first routing information corresponds to the first IP address, and the priority of the first routing information is lower than the priority of the second routing information, and the second routing information is all The 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 the second IP address of the first terminal device served by the first UPF, And publish the third routing information of the disaster-tolerant UPF to a second routing network, the second routing network is a routing network between a core network and a data network, and 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 the downlink routing information of the first UPF, and the fourth routing information is the same as the second IP Address correspondence, wherein the second IP address of the first terminal device belongs to the IP address segment corresponding to the first UPF; a receiving module is configured to receive the first response information sent by the disaster recovery UPF, the response information The identifier of the first UPF is included, wherein the second IP address of the first terminal device belongs to the IP address segment corresponding to the first UPF; the sending module is further configured to: according to the first response information, Send a second activation request to the first UPF, the second activation request information is used to request activation of the first terminal device; the receiving module is also used to: receive the second response information sent by the first UPF, so The second response information includes the first IP address; the sending module is further configured to: send a third activation request message to the disaster tolerance UPF, where the third activation request message includes channel information of the access network, so The channel information is used for downlink data transmission of the disaster-tolerant UPF; the receiving module is further used to: receive a third response message sent by the disaster-tolerant UPF, where the third response message is used to indicate the disaster-tolerant UPF The downlink channel has been opened; the sending module is further configured to send a fourth activation request to the first UPF, where the fourth activation request message includes channel information of the access network, and the channel information is used for the Downlink data transmission of the first UPF; the receiving module is further configured to receive a fourth response message sent by the first UPF, where the fourth response message is used to indicate that the downlink channel of the first UPF has been opened.

With reference to the sixth aspect, in some implementation manners of the sixth aspect, the apparatus further includes: a processing module configured to allocate an IP address for the first terminal device; and the first activation request information further includes the The second IP address of the first terminal device.

With reference to the sixth aspect, in some implementation manners of the sixth aspect, when the IP address of the first terminal device is allocated by the disaster tolerance UPF, the first response information further includes the IP address.

With reference to the sixth aspect, in some implementations of the sixth aspect, 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 It also includes the tunnel endpoint identifier of the first terminal device.

With reference to the sixth aspect, in some implementation manners of the sixth aspect, the device further includes: a data recovery module, configured to send a private data package to the first UPF after the first UPF fails to recover. Restore user data.

In a seventh aspect, a communication device is provided. The device includes a unit for implementing the method in the first aspect or any possible implementation of the first aspect; or for implementing the second aspect or any of the second aspects. A unit of a method in a possible implementation manner; or a unit used to implement the third aspect or a method in any possible implementation manner of the third aspect.

In an eighth aspect, a computer-readable storage medium is provided, and a computer program is stored on the computer-readable storage medium. When the computer program is run, the device executes any possible method as in the first aspect or the first aspect. The method in the implementation manner, or causes the apparatus to execute the method in any possible implementation manner of the second aspect or the second aspect, or causes the apparatus to execute the method in any possible implementation manner of the third aspect or the third aspect

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

Description of the drawings

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

Figure 2 is a schematic diagram of a UPF failure 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 partial architecture of a system 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 schematic diagram of a data transmission path in the prior art.

FIG. 8 is a schematic diagram of a UPF failure 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 ways

The technical solution in this application will be described below in conjunction with the accompanying drawings.

The terminal equipment in the embodiments of this application may refer to user equipment, access terminals, user units, user stations, mobile stations, mobile stations, remote stations, remote terminals, mobile equipment, user terminals, terminals, wireless communication equipment, user agents, or User device. The terminal device can 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), with wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in the future 5G network, or future evolution of the public land mobile network (PLMN) Terminal equipment, etc., this embodiment of the present application is not limited thereto.

The network device in the embodiment of the present application may be a device used to communicate with terminal devices, and the network device may be a global system of mobile communication (GSM) system or code division multiple access (CDMA) The base transceiver station (BTS) in the LTE system can also be the base station (NodeB, NB) in the wideband code division multiple access (WCDMA) system, or the evolutionary base station (evolutional base station) in the LTE system. NodeB, eNB or eNodeB), it can also be a wireless controller in a cloud radio access network (CRAN) scenario, or the network device can be a relay station, an access point, a vehicle-mounted device, a wearable device, and the future The network equipment in the 5G network or the network equipment in the future evolved PLMN network, etc., are not limited in the embodiment of the present application.

At present, the fifth-generation mobile communication technology (5th-generation, 5G) is in a period of vigorous development. The 5G wireless communication core network includes the following functions: User plane function (UPF) is the entity that forwards user plane data. The external protocol data unit (PUD) Session anchor point of the data network interconnection, with message routing and forwarding, message detection, user plane policy execution, legal monitoring, traffic usage report, quality of service (quality of service) service, QoS) processing and other functions; access and mobility management function (access and mobility management function, AMF) is mainly responsible for connecting with wireless, terminating the radio access network (RAN) CP interface (N2), terminating non- Access layer (non-access stratum, NAS) (N1) and NAS encryption and integrity protection, registration management, connection management, reachability management, mobility management, transfer of SM messages between UE and SMF, UE mobility events Notification and other functions; session management function (session management function, SMF), which provides session management functions such as session establishment, modification and release, including the tunnel maintenance function between UPF and AN nodes, UE IP address allocation and management, and dynamic host configuration protocol ( dynamic host configuration protocol, DHCP), select and control UP function, configure UPF diversion function, termination policy control function interface, billing, roaming function, policy control related functions.

The user terminal UE needs to access the UPF of the 5G core network through a radio access network (RAN), so that it can access the data network (DN). The network element SMF controls the selection and access of UPF. The SMF manages one or more UPFs, and the UE can access and connect with the UPF through an IP address. The 5G protocol supports multiple UPF scenarios. Figure 1 shows a schematic diagram of a 5G system architecture in the prior art. As shown in Figure 1, the figure includes core network elements AMF, SMF, UPF, as well as UE and access network ( R) AN, data network DN, the solid line in the figure represents the actual data transmission path, UE-AN-UPF-DN, where the signal transmission between AN and UPF is through logical interface N3, and between SMF and UPF through logic The interface N4 performs signal transmission.

There will be a heartbeat message between the UPF and the SMF to confirm whether the UPF is still alive. If a UPF fails and cannot be returned to the SMF heartbeat response, the SMF will not select the UPF for data transmission when selecting the UPF. In the prior art, when the UPF that transmits data fails, if part of the service node of the UPF fails, such as a virtual machine (VM) failure, the UPF can achieve fast service through redundant backup methods such as N+1, Nway, etc. Switch. However, when the UPF fails as a whole, such as direct current (DC) power failure, NLS failure, and other scenarios, it is impossible to quickly reply to service transmission through current technology to avoid interruption of service transmission. In the prior art, if the UPF is restarted and quickly restored, the SMF will re-establish a connection with the UPF and resume the user session. If the UPF failure cannot be recovered, the SMF will reselect the UPF and then recreate the PDU Session for the user.

Figure 2 shows a schematic diagram of a UPF failure recovery process in the prior art. As shown in FIG. 2, the method 200 includes steps S210 to S280. S210: The SMF sends a heartbeat request to the UPF to determine whether the UPF is alive. S220: The UPF receives the heartbeat request from the SMF, and replies to the heartbeat response, and the response carries a recovery time stamp. S230, the UPF fails and restarts. S240: After the UPF is restored, receive the heartbeat request message from the SMF. S250, UPF replies with a heartbeat response, and carries a new recovery value in the recovery time stamp. S260: The SMF discovers that the new recover value is received, deletes all user contexts, and sends a packet forwarding control protocol (PFCP) link setup request (association setup request) to establish an N4 association. S270, UPF returns a response (PFCP association setup response). S280: After the link is established, restore the PFCP session in the UPF. In the prior art, no matter which recovery method is adopted, service transmission will be interrupted during the process.

This application provides user routing information of different priorities for the same user, so that when the UPF fails and the routing of its high-priority users becomes invalid, the uplink or downlink data of the terminal device can be converted through routing, using the low priority issued by the disaster recovery UPF Level-level users route and transmit data, thereby achieving the beneficial effect of uninterrupted service transmission when UPF fails. Fig. 3 shows a schematic diagram of a communication method according to 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 tolerance user plane function UPF obtains the first network protocol IP address of the first UPF.

S320: The disaster-tolerant UPF publishes 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 the priority of the first routing information is low Regarding the priority of the second routing information, the second routing information is the uplink routing information of the first UPF, and the second routing information corresponds to the first IP address.

Disaster recovery UPF publishes low-priority first routing information corresponding to the second routing information of the first UPF to the first routing network, so that when the first UPF fails and the second route fails, the uplink data can be routed Conversion, using the first routing information issued by the disaster recovery UPF for data transmission, thereby avoiding service transmission interruption and ensuring the continuity of service transmission.

Optionally, the first routing information may also include the tunnel endpoint identifier of the first terminal device served by the first UPF. When the tunnel endpoint identifier of the terminal device is allocated by the UPF, the disaster-tolerant UPF may receive the first terminal device sent by the SMF. Information, the first information may include the tunnel endpoint identifier of the first terminal device.

As an embodiment, the disaster-tolerant UPF may obtain third information, which is used to indicate the IP address segment corresponding to each of the multiple UPFs; then the disaster-tolerant UPF receives the fourth information sent by the SMF, the fourth information It may include the second IP address of the first terminal device; the disaster recovery UPF sends fifth information to the SMF, and the fifth information may include the identification of the first UPF, where the second IP address belongs to the IP address segment corresponding to the first UPF, so that According to the fifth information, the SMF determines the first UPF as the serving UPF of the first terminal device.

As another embodiment, the disaster-tolerant UPF can acquire sixth information, and the sixth information is used to indicate the IP address segment corresponding to each UPF in the multiple UPFs; the disaster-tolerant UPF can allocate the second IP to the first terminal device The disaster recovery UPF sends seventh information to the SMF. The seventh information includes the identifier of the first UPF, where the second IP address belongs to the IP address segment corresponding to the first UPF, so that the SMF can follow the seventh Information, the first UPF is determined as the service UPF of the first terminal device. Optionally, the seventh information may include the second IP address segment.

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

As an embodiment, after the failure of the first UPF is restored, the disaster-tolerant UPF may restore user data to the first UPF through private data encapsulation. Optionally, 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, etc. Optionally, after the failure of the first UPF is restored, data can also be restored to the first UPF through SMF. The restoration process shown in S260 to S280 of FIG. A UPF restores user data. Optionally, when the disaster-tolerant UPF and/or SMF restore data to the first UPF, user-by-user recovery may be adopted.

By using the disaster recovery UPF and/or SMF to restore user data to the first UPF, only the information exchange between the network elements SMF and UPF is required during the recovery process, and the surrounding network elements have no perception, thereby reducing end-to-end perception and avoiding Signaling shock.

Optionally, when the first UPF is working normally, the heartbeat message may be maintained with the disaster recovery UPF.

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 tolerance user plane function UPF obtains the second network protocol IP address of the first terminal device served by the first UPF.

Optionally, the second IP address of the above-mentioned first terminal device may be allocated by SMF, or may be allocated by disaster-tolerant UPF.

S420: The disaster-tolerant UPF publishes third routing information of the disaster-tolerant UPF to a 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 publishing low-priority third routing information corresponding to the fourth routing information of the first UPF to the second routing network, when the first UPF fails and the fourth routing information of the first UPF becomes invalid, the downlink data can be Perform route conversion and use the third route information issued by the disaster recovery UPF for data transmission, thereby avoiding service transmission interruption and ensuring the continuity of service transmission.

As an embodiment, the disaster recovery UPF may receive a second message sent by the SMF, where the second message includes channel information of the access network, and the disaster recovery UPF may forward downlink data to the access network according to the channel information of the access network. It should be understood that the channel information here is the same as the process and content of the UPF receiving the channel information sent by the SMF in the prior art, and the embodiment of the present application will not repeat it too much.

It should be understood that, in the embodiment of the present application, the disaster recovery UPF may also determine the first UPF through information interaction with the SMF, or restore user data to the first UPF through a private data encapsulation format, and the content is the same as that described in the above method 300. I won't go into too much detail here.

As an embodiment, the disaster-tolerant UPF in this application can be used as a centralized point of UE address allocation of a group of UPF in architecture. Correspondence, such as UPF1, UPF2, UPF3, UPF4 and the address segment (segment) seg1, seg2, seg3, seg4, respectively. Further, the UPF may use corresponding identifiers to indicate these correspondences, for example, UPF1-seg1 is indicated by 1, or UPF1, and the form of the identifier is not limited in this application. When a set of correspondences between UPFs and address segments are maintained on the disaster recovery UPF, the disaster recovery UPF can directly obtain the correspondences maintained by the disaster recovery UPF, and return the corresponding identification to the SMF according to the correspondences and the assigned IP addresses of the terminal devices. Optionally, when the correspondence between a group of UPFs is maintained in a disaster-tolerant UPF, if the disaster-tolerant UPF fails, because the low-priority user route of the disaster-tolerant UPF has failed, there is no user route for the group of UPF data transmission. Conversion does not have reliability. Therefore, before the disaster recovery UPF fails, the group of UPFs may not be selected as the UPF for data transmission. After the disaster recovery UPF is restored, the group of UPFs can be selected. It should be understood that the corresponding relationship maintained by the disaster recovery UPF in the embodiment of the present application may be implemented in the form of local configuration.

By maintaining a set of UPF correspondences in the disaster recovery UPF, the SMF can be more efficient when activating users in the disaster recovery UPF and UPF, and the reliability of data transmission can be improved.

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

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 establishment request message, and the AMF calls the service interface to notify the SMF to activate the user.

S640. The SMF initiates a session establishment request to the disaster recovery 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. Optionally, the SMF can obtain the binding relationship between each UPF and the user address segment by means of local configuration. Optionally, when the disaster-tolerant UPF maintains the correspondence between a group of UPF address segments, the SMF can also obtain the correspondence between the disaster-tolerant UPF and a group of user address segments of the UPF by means of local configuration.

S650. The disaster recovery UPF returns a session establishment request response message. The response message may include the identifier of the first UPF. The identifier of the first UPF is used to indicate the correspondence between the first UPF and the address segment of the terminal device. The identifier of the UPF may be represented by the ID, index, or name of the first UPF. Optionally, if the second IP address of the first terminal device is allocated by the disaster-tolerant UPF, the response message may also include the allocated second IP address of the first terminal device. Optionally, after the disaster recovery UPF learns the second IP address information carried by the SMF, or after the disaster recovery UPF allocates the second IP address, that is, after the disaster recovery UPF learns the second IP address allocated by the terminal device, the disaster recovery UPF can Publish low-priority user routing information, because the low-priority user routing is determined by the disaster recovery UPF according to the assigned second IP address of the terminal device. It should be understood that the disaster recovery UPF can learn the correspondence between a group of UPFs and user address segments through local configuration, and the correspondence can be represented by the UPF identifier, and the disaster recovery UPF can also acquire a group of UPFs through local configuration. Own IP address.

S660. The SMF selects a first UPF from multiple UPFs according to the first UPF identifier received in the above steps, 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 local traffic offloading rules, and then the first UPF can publish high-priority user routes.

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

S680. The SMF sends an N1 N2 message transfer message to the AMF, where N1 message is sent to the terminal device to inform the UE of the default Qos rule (rule), the second IP address assigned to the terminal device, etc. , N2 message is sent to the RAN side, used to inform the RAN side of the selected first UPF tunnel address and the F-TEID of the corresponding terminal device, that is, uplink channel information, and QOS flow, etc. In this step, AMF is mainly used for information Transit.

S690. The AMF sends a N2 PDU session request message to the RAN side. The AMF sends the NAS message including the PDU session ID for the terminal device, the NAS message received for establishing the PUD session, etc., to the RAN side. The message also carries the N2 message in the previous step.

S6100, the RAN side sends an AN-specific signaling exchange related to the information received from the SMF to the UE. S6110. The RAN sends an N2 PDU session response message to the SMF. The response message may include tunnel information of the RAN. The RAN channel information is the downlink access network address of the N3 channel corresponding to the PDU session. The channel information of this RAN is Determined by the RAN side. Go to step S6110, and the data uplink channel is opened.

S6120: The AMF sends update request information to the SMF, and the information may include the channel information of the AN. S6130. The SMF sends an N4 session modification request message to the disaster recovery UPF. The message can carry the corresponding forwarding rule and the channel information on the RAN side. Optionally, if the F-TEID of the terminal device is allocated by the first UPF, The channel information on the local side allocated by the first UPF may also be carried here, and the channel information on the local side may include the first UPF tunnel address and the F-TEID of the terminal device. S6140: The disaster recovery UPF sends an N4 session modification response message to the SMF. S6150. The SMF sends an N4 session modification request message to the selected first UPF. The message may carry the corresponding forwarding rule and the channel information on the RAN side. S6160: The selected first UPF sends an N4 session modification response message. At this point, the downlink data has also been opened up.

After the user is successfully activated, when the first UPF works normally, the data uplink transmission path is RAN->UPF->DN, and the downlink transmission path is DN->UPF->AN. FIG. 7 shows the data uplink and downlink path when the UPF is working normally in the prior art. As shown in Figure 7, in the uplink path, after the uplink message sent by the UE reaches the RAN side, the RAN side discards the data message to the corresponding uplink channel information according to the uplink channel information in the N2 message obtained in S690 in Figure 6 Data routing. When the first UPF is working normally, the high-priority user route advertised by it is effective, so the data message reaches the N3 logical interface of the corresponding selected UPF through the high-priority user route. Then, the first UPF Remove the IP header belonging to the first UPF of the data packet, and only keep the destination IP that the user visits. After the UPF forwards the data packet with the removed UPF IP address, the data packet reaches the data network DN corresponding to the destination IP, and the uplink ends. .

In the downlink path, the data network sends a downlink message that carries the second IP address of the terminal device. The data message reaches the first UPF through the first UPF's high-priority user route. The data packet is encapsulated with the IP header of the first UPF and arrives at the RAN according to the RAN channel information in step S6110 in FIG. 6. It should be understood that this application does not improve the data transmission between the UE and the RAN. The data transmission process is an existing technology, and this application will not go into details here.

During the communication process, heartbeat messages are maintained between the disaster recovery UPF and UPF, and between SMF and UPF, and the heartbeat message is used to confirm whether the UPF is faulty. Fig. 8 shows a schematic diagram of the UPF failure detection and recovery process of an embodiment of the present application. As shown in Fig. 8, S810, data transmission before the UPF failure, the data transmission process is shown in Fig. 7, and will not be repeated here. S820: The disaster recovery UPF sends an N4 heartbeat request message to the UPF. S830, the UPF sends an 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. The specific steps are shown in Figure 2. A schematic diagram of a UPF failure recovery process in the prior art is presented. S840, UPF is faulty. S850: The disaster recovery UPF sends an N4 heartbeat request message to the UPF to confirm whether the UPF returns to normal. S860, when the UPF is still in a fault state, the low-priority user route of the disaster-tolerant UPF takes effect, and the low-priority user route may be advertised by the disaster-tolerant UPF during the activation process in FIG. 6, or the low-priority user The route can also be advertised in this step.

S870: Perform data transmission in the UPF failure, and the transmission path in the failure is: uplink transmission RAN->disaster tolerance UPF->DN, and downlink transmission DN->disaster tolerance UPF->RAN. FIG. 9 shows a schematic diagram of data transmission through disaster recovery UPF during a UPF failure in an embodiment of the present application. As shown in FIG. 9, when UPF fails, the route of high priority users of UPF fails, and data packets pass disaster recovery. UPF performs transmission. In the uplink transmission process, when the RAN receives the uplink message from the UE, it will discard the data message to the corresponding user route according to the uplink channel information obtained in S690 in Figure 6. At this time, the UPF The high-priority user route of the data packet fails, so the data message is transmitted to the N3 logical interface of the disaster-tolerant UPF through the low-priority user route advertised by the disaster-tolerant UPF. When the data message reaches the disaster recovery UPF, the disaster recovery UPF also removes the UPF IP header of the data message, and then discards the data message that retains the access destination IP address, and the data message arrives according to the access destination IP address Data network DN. Optionally, if the message carries an identifier such as QFI, during disaster recovery UPF-C data transmission, special processing without packet loss is required 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 message carrying the IP address of the terminal device. The data message reaches the disaster recovery UPF through the low-priority user route, and the disaster recovery UPF seals the IP header of the data message with UPF IP According to the RAN channel information forwarded in step S6110 in Figure 6 to the RAN side, and then to the corresponding UE through the AN side, it should be understood that the data transmission process between the UE and the AN is an existing technology, and this application will not do it here. Too much detail.

S880, user context recovery, 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 returned to normal. Optionally, the UPF can also send a heartbeat response message to the SMF, and the SMF confirms that the UPF has returned to normal; S880b , SMF or disaster recovery UPF restores user data to UPF. User data can include F-TEID, SM policy, tunnel information set, etc. Optionally, SMF can initiate an activation process to UPF and send user data to UPF according to steps S660 and S670 in Figure 6, or SMF can also encapsulate user context information in a private data encapsulation format (optional The context information can be a table), interact with the user, and restore the user data; or the user data can be restored to the UPF through the disaster recovery UPF. The disaster recovery UPF can use the private data encapsulation format to perform the user context information. Encapsulation (optionally, the context information can be a table), interact with the user, and restore the user's data. It should be understood that when the user data is restored to the UPF through the SMF or the disaster-tolerant UPF, the user data information is stored in the SMF or the disaster-tolerant UPF. SMF or disaster recovery UPF restores user data to UPF until all user data is restored. S890, SMF or disaster recovery UPF notifies UPF that the information is restored, and UPF publishes high-priority user routes and N3 logical interfaces. It should be understood that the user routes and logical interfaces are the same as before the UPF failure. In S8100, after the high-priority user route is released, the UPF resumes data transmission, and the transmission path becomes: uplink RAN->UPF->DN, and downlink DN->UPF->RAN. The transmission process is the same as the foregoing process, and will not be repeated here.

FIG. 10 shows a schematic diagram of a communication device according to an embodiment of the present application. The device 1000 includes an acquiring module 1100 and a sending module 1200.

The obtaining module is used to obtain the first network protocol IP address of the first user plane function UPF; the sending module is used to publish the first routing information of the disaster recovery UPF to the first routing network, and the first routing network is the access network and the core In a routing network between networks, the first routing information corresponds to the first IP address, and the priority of the first routing information is lower than the priority of the second routing information, and the second routing information is all For the uplink routing information of the first UPF, the second routing information corresponds to the first IP address.

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

Optionally, the acquiring module is further configured to: acquire third information, where the third information is used to indicate the IP address segment corresponding to each UPF in a plurality of UPFs; the receiving module is also configured to receive SMF sent Fourth information, where the fourth information includes the second IP address of the first terminal device; the sending module is further configured to: send fifth information to the SMF, where the fifth information includes the first UPF , Wherein the second IP address belongs to the IP address segment corresponding to the first UPF, so that the SMF can determine the first UPF as the first terminal device’s Service UPF.

Optionally, the acquisition module is further configured to: acquire sixth information, where the sixth information is used to indicate the IP address segment corresponding to each UPF among the multiple UPFs; the device further includes: a processing module, configured to Allocate the second IP address to the first terminal device; the sending module is further configured to: send seventh information to the SMF, where the seventh information includes the identifier of the first UPF, where the second The IP address belongs to the 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 device further includes: a data recovery module, configured to recover user data to the first UPF by way of private data encapsulation after the failure of the first UPF is recovered.

Optionally, a heartbeat message is maintained between the disaster recovery UPF and the first UPF during normal operation.

FIG. 11 shows a schematic diagram of another communication device according to an embodiment of the present application. The device 1100 includes an obtaining module 1110 and a sending module 1120.

The obtaining module is used to obtain the second network protocol IP address of the first terminal device served by the first user plane function UPF; the sending module is used to publish the third routing information of the disaster-tolerant UPF to the second routing network, the second routing network Is the 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 first 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 device further includes: a receiving module, configured to receive second information sent by the session management function SMF, the second information includes channel information of the access network, and the sending module is further configured to: Channel information, sending downlink data to the first terminal device.

FIG. 12 shows a schematic diagram of another communication device according to an embodiment of the present application. The device 1200 includes a sending module 1210 and a receiving module 1220.

The sending module is configured to send first activation request information to the disaster tolerance user plane function UPF, where the first activation request information is used to request activation of the first terminal device, wherein the disaster tolerance UPF is used to obtain the first network protocol of the first UPF IP address, and publish the first routing information of the disaster-tolerant UPF to the first routing network. The first routing network is the routing network between the access network and the core network. The first routing information is related to the first routing information. Corresponds to an IP address, and the priority of the first routing information is lower than the priority of the second routing information, the second routing information is the uplink routing information of the first UPF, and the second routing information is The first IP address corresponds, or the disaster recovery UPF is used to obtain the second IP address of the first terminal device served by the first UPF, and the disaster recovery UPF publishes the information of the disaster recovery UPF to the second routing network. Third routing information, 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, and the priority of the third routing information is lower than Priority of the fourth routing information, the fourth routing information is the downlink routing information of the first UPF, the fourth routing information corresponds to the second IP address, and the first terminal device The second IP address 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-tolerant UPF, where the response information includes the identifier of the first UPF, wherein the first UPF The second IP address of a terminal device belongs to the IP address segment corresponding to the first UPF; the sending module is further configured to: send a second activation request to the first UPF according to the first response information, and The second activation request information is used to request activation of the first terminal device; the receiving module is also used to: receive second response information sent by the first UPF, where the second response information includes the first IP address; The sending module is further configured to send a third activation request message to the disaster-tolerant UPF, where the third activation request message includes channel information of the access network, and the channel information is used for downlink data transmission of the disaster-tolerant UPF The receiving module is also used to: receive a third response message sent by the disaster-tolerant UPF, the third response message is used to indicate that the disaster-tolerant UPF downlink channel has been opened; the sending module is also used to: The first UPF sends a fourth activation request, 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 also uses Yu: Receive a fourth response message sent by the first UPF, where the fourth response message is used to indicate that the downlink channel of the first UPF has been opened.

Optionally, the apparatus further includes: a processing module configured to allocate an IP address to the first terminal device; 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 allocated by the disaster recovery UPF, 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 symbol.

Optionally, the device further includes:

The data recovery module is configured to recover user data to the first UPF by way of private data encapsulation after the failure of the first UPF is recovered.

In the several embodiments provided in this application, it should be understood that the disclosed device and method may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the modules is only a logical function division, and there may be other division methods in actual implementation.

If the method in the embodiments of this application is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution or technical solution of this application is Part of it can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the various embodiments of this application. All or part of the steps of the method. The storage medium includes at least: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disk and other media that can store program codes. The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A communication method, characterized in that it comprises:

The disaster tolerance user plane function UPF obtains the first network protocol IP address of the first UPF;

The disaster-tolerant UPF publishes the first routing information of the disaster-tolerant UPF to a first routing network, where the first routing network is a routing network between an access network and a core network, and the first routing information is related to the The first IP address corresponds, and the priority of the first routing information is lower than the priority of the second routing information, the second routing information is the uplink routing information of the first UPF, and the second routing information is The first IP address corresponds.
The method according to claim 1, wherein the first routing information further comprises a tunnel endpoint identifier of the first terminal device served by the first UPF, and

The method also includes:

The disaster recovery UPF receives the first information sent by the session management function SMF, where the first information includes the tunnel endpoint identifier of the first terminal device.
A communication method, characterized in that it comprises:

The disaster tolerance user plane function UPF obtains the second network protocol IP address of the first terminal device served by the first UPF;

The disaster-tolerant UPF publishes third routing information of the disaster-tolerant 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 is related to the first routing information. The second IP address corresponds, and the priority of the third routing information is lower than the priority of the fourth routing information, the fourth routing information is the downlink routing information of the first UPF, and the fourth routing information is the same as that of the fourth routing information. The second IP address corresponds.
The method according to claim 3, wherein the method further comprises:

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

The disaster recovery UPF sends downlink data to the first terminal device according to the channel information.
The method according to any one of claims 1 to 4, wherein the method further comprises:

The disaster recovery UPF acquires third information, where the third information is used to indicate the IP address segment corresponding to each UPF of the multiple UPFs;

The disaster recovery UPF receives fourth information sent by the SMF, where the fourth information includes the second IP address of the first terminal device;

The disaster recovery UPF sends fifth information to the SMF, where the fifth information includes the identifier of the first UPF, and the second IP address belongs to the IP address segment corresponding to the first UPF, so as to facilitate The SMF determines the first UPF as the serving UPF of the first terminal device according to the fifth information.
The method according to any one of claims 1 to 4, wherein the method further comprises:

Acquiring, by the disaster tolerance UPF, sixth information, where the sixth information is used to indicate the IP address segment corresponding to each UPF of the multiple UPFs;

The disaster recovery UPF allocates the second IP address to the first terminal device;

The disaster recovery UPF sends seventh information to the SMF, where the seventh information includes the identifier of the first UPF, and the second IP address belongs to the IP address segment corresponding to the first UPF so as to facilitate The SMF determines the first UPF as the serving UPF of the first terminal device according to the seventh information.
The method according to any one of claims 1 to 6, wherein after the failure of the first UPF is restored, the disaster-tolerant UPF restores user data to the first UPF by way of private data encapsulation.
The method according to any one of claims 1-7, wherein a heartbeat message is maintained between the first UPF and the disaster-tolerant UPF when the first UPF is working normally.
A communication method, characterized in that it comprises:

The session management function SMF sends first activation request information to the disaster tolerance user plane function UPF, where the first activation request information is used to request activation of the first terminal device, and the disaster tolerance UPF is used to obtain the first UPF of the first UPF. Network protocol IP address, and publish the first routing information of the disaster-tolerant UPF to the first routing network. The first routing network is the routing network between the access network and the core network. The first IP address corresponds, and the priority of the first routing information is lower than the priority of the second routing information, the second routing information is the uplink routing information of the first UPF, and the second routing information Corresponds to the first IP address, or the disaster recovery UPF is used to obtain the second IP address of the first terminal device served by the first UPF, and publish the second IP address of the disaster recovery UPF to the second routing network. Three routing information, 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, and the priority of the third routing information is lower than that of the first Fourth, the priority of routing information, the fourth routing information is the downlink routing information of the first UPF, the fourth routing information corresponds to the second IP address, and the second of the first terminal device The IP address belongs to the IP address segment corresponding to the first UPF;

Receiving, by the SMF, first response information sent by the disaster recovery UPF, where the response information includes an identifier of the first UPF;

The SMF sends a second activation request to the first UPF according to the first response information, where the second activation request information is used to request activation of the first terminal device;

Receiving, by the SMF, second response information sent by the first UPF, where the second response information includes the first IP address;

Sending, by the SMF, third activation request information to the disaster-tolerant UPF, where the third activation request information includes channel information of the access network, and the channel information is used for downlink data transmission of the disaster-tolerant UPF;

Receiving, by the SMF, third response information sent by the disaster-tolerant UPF, where the third response information is used to indicate that a downlink channel of the disaster-tolerant UPF has been opened;

Sending, by the SMF, fourth activation request information to the first UPF, where the fourth activation request information includes channel information of the access network, and the channel information is used for downlink data transmission of the first UPF;

The SMF receives fourth response information sent by the first UPF, where the fourth response information is used to indicate that the downlink channel of the first UPF has been opened.
The method according to claim 9, wherein when the IP address of the first terminal device is allocated by the SMF, the first activation request information further includes the second IP address of the first terminal device address.
The method according to claim 9, wherein when the IP address of the first terminal device is allocated by the disaster-tolerant UPF, the first response information further includes the second IP address of the first terminal device address.
The method according to any one of claims 9-11, wherein when the tunnel endpoint identifier of the first terminal device is allocated by the first UPF, the second response information and the first UPF 3. The activation request information also includes the tunnel endpoint identifier of the first terminal device.
The method according to any one of claims 9-12, wherein the method further comprises:

After the failure of the first UPF is restored, the SMF restores user data to the first UPF through private data encapsulation.
A communication device, characterized in that it comprises:

The obtaining module is used to obtain the first network protocol IP address of the first user plane function UPF;

The sending module is configured to publish the first routing information of the disaster recovery UPF to the first routing network. The first routing network is the routing network between the access network and the core network. The first routing information is related to the first routing information. Corresponding to the IP address, and the priority of the first routing information is lower than the priority of the second routing information, the second routing information is the uplink routing information of the first UPF, and the second routing information is The first IP address corresponds.
The apparatus according to claim 14, wherein the first routing information further comprises a tunnel endpoint identifier of the first terminal device served by the first UPF, and

The device also includes:

The receiving module is configured to receive first information sent by the access and mobility management function SMF, where the first information includes the tunnel endpoint identifier of the first terminal device.
A communication device, characterized in that it comprises:

An obtaining module, configured to obtain the second network protocol IP address of the first terminal device served by the first session management function UPF;

The sending module is configured to publish third routing information of disaster-tolerant UPF to a second routing network, where the second routing network is a routing network between a core network and a data network, and the third routing information is related to the second IP Address corresponding, and the priority of the third routing information is lower than the priority of the fourth routing information, the fourth routing information is the downlink routing information of the first UPF, and the fourth routing information is the same as that of the first UPF. Two IP address correspondence.
The device according to claim 16, wherein the device further comprises:

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

The sending module is also used for:

Sending downlink data to the first terminal device according to the channel information.
The device according to any one of claims 14-17, wherein the acquisition module is further configured to:

Acquiring third information, where the third information is used to indicate the IP address segment corresponding to each of the multiple UPFs;

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

The sending module is also used for:

Send fifth information to the SMF, where the fifth information includes the identifier of the first UPF, where the second IP address belongs to the IP address segment corresponding to the first UPF, so that the SMF can follow the The fifth information determines that the first UPF is the serving UPF of the first terminal device.
The device according to any one of claims 14-17, wherein the acquisition module is further configured to:

Acquiring sixth information, where the sixth information is used to indicate the IP address segment corresponding to each UPF of the multiple UPFs;

The device also includes:

A processing module, configured to allocate the second IP address to the first terminal device;

The sending module is also used for:

Send seventh information to the SMF, where the seventh information includes the identifier of the first UPF, where the second IP address belongs to the IP address segment corresponding to the first UPF, so that the SMF can follow the The seventh information determines that the first UPF is the serving UPF of the first terminal device.
The device according to any one of claims 14-19, wherein the device further comprises:

The data recovery module is configured to recover user data to the first UPF through private data encapsulation after the failure of the first UPF is recovered.
The device according to any one of claims 14-20, wherein the disaster recovery UPF and the first UPF maintain heartbeat messages during normal operation.
A communication device, characterized in that it comprises:

The sending module is configured to send first activation request information to the disaster tolerance user plane function UPF, where the first activation request information is used to request activation of the first terminal device, where the disaster tolerance UPF is used to obtain the first network of the first UPF Protocol IP address, and publish the first routing information of the disaster-tolerant UPF to the first routing network. The first routing network is the routing network between the access network and the core network. The first routing information is related to the The first IP address corresponds, and the priority of the first routing information is lower than the priority of the second routing information, the second routing information is the uplink routing information of the first UPF, and the second routing information is The first IP address corresponds, or the disaster recovery UPF is used to obtain the second IP address of the first terminal device served by the first UPF, and publish the third IP address of the disaster recovery UPF to the second routing network. Routing information, 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, and the priority of the third routing information is lower than that of the fourth routing information Priority of 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 of the first terminal device The address 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 the identifier of the first UPF, wherein the second IP address of the first terminal device belongs to the first UPF The corresponding IP address segment;

The sending module is further configured to send a second activation request to the first UPF according to the first response information, where the second activation request information is used to request activation of the first terminal device;

The receiving module is further configured to receive second response information sent by the first UPF, where the second response information includes the first IP address;

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

The receiving module is further configured to receive a third response message sent by the disaster-tolerant UPF, where the third response message is used to indicate that the disaster-tolerant UPF downlink channel has been opened;

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

The receiving module is further configured to receive a fourth response message sent by the first UPF, where the fourth response message is used to indicate that the downlink channel of the first UPF has been opened.
The device according to claim 22, wherein the device further comprises:

A processing module, configured to allocate an IP address for the first terminal device; and

The first activation request information further includes the second IP address of the first terminal device.
The apparatus according to claim 22, wherein when the IP address of the first terminal device is allocated by the disaster recovery UPF, the first response message further includes the IP address of the first terminal device.
The apparatus according to any one of claims 22-24, wherein when the tunnel endpoint identifier of the first terminal device is allocated by the first UPF, the second response message and the third The activation request message also includes the tunnel endpoint identifier of the first terminal device.
The device according to any one of claims 22-25, wherein the device further comprises:

The data recovery module is configured to recover user data to the first UPF by way of private data encapsulation after the failure of the first UPF is recovered.
A communication device, characterized in that it comprises:

A unit for implementing the method of any one of claims 1-2 and 5-8; or

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

A unit for implementing the method of any one of claims 9-13.
A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, and when the computer program is running,

Cause the device to execute the method according to any one of claims 1-2 and 5-8; or

Cause the device to execute the method according to any one of claims 3-8; or

The device is caused to execute the method according to any one of claims 9-13.
A chip system, characterized by comprising: a processor, used to call and run a computer program from a memory,

Enable the communication device installed with the chip system to execute the method according to any one of claims 1-2 and 5-8; or

Enable the communication device installed with the chip system to execute the method according to any one of claims 3-8; or

The communication device installed with the chip system is caused to execute the method according to any one of claims 9-13.