WO2018201973A1 - Procédé et appareil destinés à une transmission de messages - Google Patents

Procédé et appareil destinés à une transmission de messages Download PDF

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Publication number
WO2018201973A1
WO2018201973A1 PCT/CN2018/084729 CN2018084729W WO2018201973A1 WO 2018201973 A1 WO2018201973 A1 WO 2018201973A1 CN 2018084729 W CN2018084729 W CN 2018084729W WO 2018201973 A1 WO2018201973 A1 WO 2018201973A1
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WO
WIPO (PCT)
Prior art keywords
interface
group
management function
session
session management
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PCT/CN2018/084729
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English (en)
Chinese (zh)
Inventor
朱奋勤
吴问付
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from CN201810289567.3A external-priority patent/CN108810988B/zh
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2018201973A1 publication Critical patent/WO2018201973A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/34—Selective release of ongoing connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/34—Selective release of ongoing connections
    • H04W76/36—Selective release of ongoing connections for reassigning the resources associated with the released connections

Definitions

  • the present application relates to the field of communications technologies, and in particular, to a method and an apparatus for message transmission.
  • the Serving GateWay can save the session context of the User Equipment (UE), and the session context of the UE includes the UE.
  • the IP address of the Mobility Management Entity (MME) when the SGW needs to send a downlink message related to the UE to the MME, the IP of the MME serving the UE may be obtained from the saved session context of the UE. The address, and further, sends a downlink message related to the UE to the MME according to the obtained IP address.
  • MME Mobility Management Entity
  • the UE session context is saved in the SMF, and the UE session context is included in the The external interface information of the processing unit (or the AMF instance served by the UE) in the access and Mobility Management Function (AMF) of the UE service, when the SMF needs to send the downlink message related to the UE,
  • the external interface information of the processing unit (or the AMF instance served by the UE) in the AMF that is served by the UE is obtained according to the session context of the UE, and the downlink message related to the UE is sent according to the obtained external interface information.
  • the SMF each time the SMF needs to send a downlink message related to the UE, the SMF sends a downlink message to the processing unit (or the AMF instance served by the UE) in the AMF that was last served for the UE, which will cause the UE to Always being served by the same processing unit or AMF instance, load imbalance will occur.
  • the embodiment of the present invention provides a method and a device for transmitting a message, which can solve the problem that the session management function device sends a UE-related downlink message to the first device that is served by the UE for the last time, and the load is unbalanced.
  • the application provides a method for message transmission, the method comprising:
  • the session management function device receives the deletion indication from the first device and the indication information of the group to which the first device belongs.
  • the session management function device is configured according to the session management function device.
  • the deletion indicates that the second interface information in the UE session context is deleted. Then, when the session management function device needs to send the downlink message, the session management function device sends the downlink message to the second device, where the second device is the indication information according to the group.
  • the deletion indication is used to indicate that the session management function device deletes the second interface information in the session context of the user equipment UE when the first interface release message is received, where the first interface is the radio access network RAN and the An interface between the first device, where the second interface is an interface between the first device and the session management function device.
  • the session management function device may be an AMF device, and the first device and the second device may each be an instance of the AMF group, or both the first device and the second device may be one of the AMF devices.
  • the session management function device deletes the second interface information in the UE session context, and then when the session management function device needs to send the downlink message, Searching for the interface information of the first device serving the UE last time from the UE context, and then triggering the process of reselecting the second device serving the UE, the session management function device may send the downlink message to the second device.
  • the phenomenon of load imbalance that always occurs when the same device is used to serve the UE is avoided.
  • the session management function device receives the deletion indication from the first device and the indication information of the group to which the first device belongs, and may be implemented as: the session management function device receives the session establishment request from the first device.
  • the session establishment request includes the group indication information, the deletion indication, and the second interface information.
  • the session management function device may save the indication information of the group, the deletion indication, and the second interface information in the UE session context.
  • the second interface information is saved in the UE session context, and before the UE is not switched to the idle state, the session management function device can directly communicate with the first device serving the UE according to the second interface information, without frequently reselecting The device served by the UE can improve the service quality when the UE is in the connected state.
  • the session management function device can delete the second interface information in the UE session context in time when receiving the release message of the first interface, so as to avoid the UE entering the connection state every time.
  • the session management function device deletes the second interface information in the UE session context according to the deletion indication, which may be implemented by: the session management function device deleting the UE session context according to the deletion indication in the UE session context. Second interface information.
  • the session management function device receives the deletion indication from the first device and the indication information of the group to which the first device belongs, and may be implemented as: the session management function device receives the session establishment request from the first device.
  • the session establishment request includes the indication information of the group and the second interface information, and then the session management function device receives the first interface release message from the first device, where the first interface release message includes a deletion indication.
  • the session management function device may save the indication information of the group and the second interface information in the UE session context.
  • the second interface information is saved in the UE session context, and before the UE is not switched to the idle state, the session management function device can directly communicate with the first device serving the UE according to the second interface information, without frequently reselecting
  • the device served by the UE can improve the service quality when the UE is in the connected state.
  • the session management function device receives the deletion indication from the first device and the indication information of the group to which the first device belongs, and may be implemented as: the session management function device receives the first interface from the first device. Release the message, the first interface releases the indication information including the group and the deletion indication in the message.
  • the session management function device Before the session management function device receives the first interface release message from the first device, the session management function device receives a session establishment request from the first device, where the second interface information is included in the session establishment request, and then the session management function device The second interface information is saved in a UE session context.
  • the first interface release message carries the deletion indication, so that the session management function device deletes the second interface information in the UE session context in time when the first interface release message is received, so as to prevent the UE from entering the connection state every time.
  • the same device service solves the problem of load imbalance in the prior art.
  • the session management function device deletes the second interface information in the UE session context according to the deletion indication, which may be implemented as follows: the session management function device deletes the session of the UE according to the deletion indication included in the first interface release message. Second interface information in context.
  • the indication information of the group is the group identity ID of the group; the session management function device may determine the second device serving the UE according to the group ID, and then the session management function device passes the session management function. The interface between the device and the second device sends a downlink message to the second device.
  • the indication information of the group is a default route of the group; when the session management function device needs to send a downlink message, the session management function device sends a downlink message to the device corresponding to the default route of the group. Then, the second device identifier of the device corresponding to the default route of the group is received, and the device corresponding to the default route of the group is the second device selected by the UE, and the session management function device uses the session management function device to The interface between the second device sends a downlink message to the second device corresponding to the second device identifier.
  • the indication information of the group is the default route of the group; when the session management function device needs to send the downlink message, the session management function device sends the device corresponding to the default route of the group to the second device.
  • the device that sends the downlink message, where the second device is the default route of the group, is the second device selected by the UE.
  • the session management function device after the session management function device sends a downlink message to the second device by using the device corresponding to the default route of the group, after the session management function device receives the message from the second device, the session The management function device saves the interface information between the session management function device and the second device in the UE session context.
  • the session management function device does not need to reselect each time the downlink message of the UE is sent before the UE switches to the idle state.
  • the device serving the UE can save overhead and avoid the situation in which the UE service is interrupted due to reselection of the device served by the UE.
  • the application provides a method for message transmission, the method comprising:
  • the session management function device acquires the stateless indication information and the group indication information of the group to which the first device belongs, and the stateless indication information is used to indicate that the session management function device determines the binding of the signaling connection corresponding to the user equipment UE to the first interface.
  • the second device for serving the UE is selected according to the group indication information, and then, when the session management function device receives the release notification from the first device, when the session management function device needs When the downlink message is sent, the session management function device sends a downlink message to the second device.
  • the first device is a device that serves the UE before the binding of the signaling connection and the first interface is released, the first interface is an interface between the radio access network RAN and the first device, and the second device is according to the group indication information.
  • the release notification is used to indicate that the binding of the signaling connection to the first interface has been released.
  • the session management function device may be an AMF device, and both the first device and the second device may be one instance of the AMF group, or both the first device and the second device may be one of the AMF devices.
  • the group indication information of the group to which the first device belongs may be an AMF group ID, or may be a default route of the AMF group.
  • the binding release of the signaling connection and the first interface includes but is not limited to the following two situations:
  • the first type the signaling connection corresponding to the UE is released, and the binding of the signaling connection to the first interface is also released.
  • the second type the binding of the signaling connection to the first interface is released, and the signaling connection corresponding to the UE is not released.
  • the session management function device may determine to re-select the service for the UE in the case that it is determined that the binding of the signaling connection corresponding to the UE and the first interface has been released, and the downlink message needs to be sent.
  • the two devices send downlink messages, thus avoiding the load imbalance that always occurs when the same device provides services for the UE.
  • the session management function device may determine the binding release of the signaling connection corresponding to the UE and the first interface before the session management function device sends the downlink message to the second device.
  • the session management function module needs to send a downlink message, and determines that the binding connection of the signaling connection corresponding to the UE and the first interface is released, determining, according to the group indication information, the second service for serving the UE device.
  • the second device that is determined to serve the UE can avoid the service provided by the first device to the terminal at all times.
  • the session management function device needs to send a downlink message
  • the second device may send a downlink message to the terminal.
  • the session management function device obtains the group indication information of the group to which the first device belongs, which may be implemented as follows:
  • the session management function device receives the session establishment request from the first device, where the session establishment request includes the group indication information; or the session management function device receives the release notification from the first device, where the release notification includes the group indication information.
  • the session management function device obtains stateless indication information, including:
  • the session management function device receives a session establishment request from the first device, where the session establishment request includes stateless indication information; or the session management function device receives the release notification notification from the first device, including stateless indication information; or, the session The management function device obtains stateless indication information from the local configuration information.
  • the release notification includes a deletion indication.
  • the deletion indication is used to instruct the session management function device to delete the information of the first device.
  • the session management function device deletes the information about the first device in the UE session context when the binding of the signaling connection corresponding to the UE and the binding of the first interface is released, and then the session management function device needs to send
  • the information of the first device serving the UE last time cannot be searched from the UE context, and then the process of reselecting the second device serving the UE may be triggered, and the session management function device may send the downlink message.
  • the load imbalance that always occurs when the same device provides services for the UE is avoided.
  • the session management function device after the session management function device receives the release notification from the first device, the session management function device deletes the information of the first device in the UE session context according to the stateless indication information.
  • the session management function device after the session management function device receives the release notification from the first device, the session management function device saves the release state of the binding of the signaling connection with the first interface, and then when the session management function device When the downlink message needs to be sent, the session management function determines that the binding of the signaling connection to the first interface is released according to the release state of the binding of the signaling connection with the first interface, and then the session management function determines, according to the group indication information, that The second device served by the UE.
  • the session management function device can save the release state of the binding of the signaling connection and the first interface, and further, if the session management function device needs to send the downlink message, Determining the second device for serving the UE, and avoiding that the first device is used to provide services for the UE, and the load is unbalanced. If the session management function does not need to send the downlink message, the second device for serving the UE does not need to be determined. Can save system overhead.
  • the group indication information is a group identity ID of the group to which the first device belongs; correspondingly, the session management function device sends a downlink message to the second device, which may be implemented as: The function device needs to send a downlink message, and determines that the binding of the signaling connection corresponding to the UE to the first interface is released, and then determines the second device that serves the UE according to the group ID.
  • the present application provides an apparatus for message transmission, which may implement the functions performed by the session management function device in the above first aspect or the second aspect, and the functions may be implemented by hardware or by hardware.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • the apparatus includes a processor and a communication interface configured to support the apparatus to perform the corresponding functions of the above methods.
  • the communication interface is used to support communication between the device and other network elements.
  • the apparatus can also include a memory for coupling with the processor that retains the program instructions and data necessary for the apparatus.
  • the application provides a system for message transmission, comprising the session management function device of the first aspect or the second aspect, the UE, the RAN, and a group to which the first device belongs.
  • the present application provides a computer storage medium for storing computer software instructions for use in the above-described session management function device, including a program designed to perform the above aspects.
  • the application provides a computer program product, such as a computer readable storage medium, comprising a program designed to perform the above aspects.
  • the session management function device deletes the second interface information in the UE session context, and then when the session management function device needs to send the downlink message, Searching for the interface information of the first device serving the UE last time from the UE context, and then triggering the process of reselecting the second device serving the UE, the session management function device may send the downlink message to the second device.
  • the phenomenon of load imbalance that always occurs when the same device is used to serve the UE is avoided.
  • FIG. 1 is a schematic structural diagram of a communication system provided by the present application.
  • FIG. 2 is a schematic structural diagram of another communication system provided by the present application.
  • FIG. 3 is a schematic structural diagram of an AMF device provided by the present application.
  • FIG. 4 is a schematic structural diagram of another AMF device provided by the present application.
  • FIG. 5 is a schematic structural diagram of an SMF device provided by the present application.
  • FIG. 6 is a flowchart of a method for message transmission provided by the present application.
  • FIG. 7 is a flowchart of another method for message transmission provided by the present application.
  • FIG. 8 is a flowchart of another method for message transmission provided by the present application.
  • FIG. 9 is a schematic structural diagram of an apparatus for message transmission according to the present application.
  • FIG. 10 is a flowchart of another method for message transmission provided by the present application.
  • FIG. 11 is a schematic structural diagram of another apparatus for message transmission provided by the present application.
  • the embodiment of the present application is applied to a communication system as shown in FIG. 1, which includes a session management function device 101, an access and mobility management function device 102, and an access network device 103.
  • the access and mobility management function device 102 includes multiple devices, for example, the first device and the second device, and the access and mobility management function device 102 may further include an ASF unit, and the ASF unit is a network.
  • the function may be a default AMF instance as shown in FIG. 3, or may be a dedicated network function, for example, may be a load balancer.
  • the session management function device 101 is configured to receive the deletion indication from the first device and the indication information of the group to which the first device belongs, where the first device is the device currently serving the UE in the access and mobility management function device 102.
  • the group to which the first device belongs is the access and mobility management function device 102.
  • the first device in the access and mobility management function device 102 is configured to send a first interface release message to the session management function device 101, where the first interface is an interface between the access network device 103 and the first device.
  • the session management function device 101 is further configured to delete, according to the deletion indication, the second interface information in the UE session context, where the first interface is the first device and the session management, in the case that the first interface release message from the first device is received. Interface between functional devices 101. Then, when the session management function device 101 needs to send a downlink message, the downlink device may be sent to the second device, where the second device is a device for serving the UE according to the indication information of the group.
  • the UE involved in the present application may include various handheld devices with wireless communication functions, in-vehicle devices, wearable devices, computing devices, or other processing devices connected to the wireless modem, and various forms of terminals.
  • MS Mobile station
  • UE user equipment
  • Terminal Equipment Terminal Equipment
  • soft terminal and the like.
  • the devices mentioned above are collectively referred to as UEs.
  • the present application is applicable to a 5G network.
  • the architecture diagram of the communication system is as shown in FIG. 2, which includes an Authentication Server Function (AUSF) device and unified data management (Unified).
  • Data Management (UDM) device AMF device, SMF device, Policy Control Function (PCF) device, UE, Radio Access Network (RAN) or Access Network (AN), user User Plane Function (UPF) device, Data Network (DN) device.
  • AUSF Authentication Server Function
  • UDM Data Management
  • AMF Access Management
  • SMF Policy Control Function
  • PCF Policy Control Function
  • UE Radio Access Network
  • AN Access Network
  • UPF User Plane Function
  • DN Data Network
  • the session management function device 101 in FIG. 1 can be implemented as the SMF device in FIG. 2, and the access and mobility management function device 102 in FIG. 1 can be implemented as the AMF device in FIG. 2, and the access network in FIG. Device 103 may be implemented as a RAN or AN in FIG.
  • the AMF device can serve the UE, authorize the access of the UE, and manage the mobility of the UE. At the same time, the AMF device is also used to transmit non-access stratum (NAS) messages between the UE and the SMF.
  • the RAN can communicate with the UE and the AMF device. For example, after receiving the NAS message sent by the UE, the RAN can forward the NAS message to the AMF device.
  • the SMF device can communicate with the AMF device, for example, can send downlink messages to the AMF device, and the like.
  • the SMF device is also used to manage the session.
  • the SMF device can maintain interface information between the AMF device and the SMF device in the context of the UE session, so that the SMF device can directly obtain the downlink message for a certain UE.
  • the interface information stored in the session context of the UE is determined to be the AMF device served by the UE.
  • the serial number marked on the connecting line between the devices in FIG. 2 is used to distinguish the interfaces between different devices.
  • FIG. 2 is only an exemplary schematic diagram, and the serial number of the interface between the devices is not limited in this application.
  • the UE communicates with the AMF through the N1 interface
  • the RAN communicates with the AMF through the N2 interface
  • each UPF communicates through the N9 interface
  • the UPF communicates with the DN through the N6 interface.
  • the SMF controls the SMF through the N4 interface.
  • the AMF communicates with the SMF through the N11 interface.
  • the AMF and the SMF obtain the user subscription data from the UDM through the N8 interface and the N10 interface respectively, and obtain the policy data from the PCF through the N15 interface and the N7 interface respectively.
  • the AMF devices communicate through the N14 interface
  • the AUSF communicates with the AMF through the N12 interface and communicates with the UDM through the N13 interface.
  • FIG. 1 and FIG. 2 are only schematic structural diagrams of a communication system to which the present application is applied. In actual deployment, the number of devices in the communication system is not limited to the number of devices shown in FIGS. 1 and 2.
  • each device in FIG. 1 to FIG. 2 may be implemented by one physical device, or may be implemented by multiple physical devices, or may be a logical functional module in a physical device. limited.
  • the UE, the RAN, the AMF device, the SMF device, the AUSF device, and the UDM device in the above 5G network are only one name, and the name does not limit the device itself.
  • the network element or the entity corresponding to the UE, the RAN, the AMF device, the SMF device, the AUSF device, and the UDM device may also be other names, which is not specifically limited in this embodiment of the present application.
  • the UDM device may be replaced with a Home Subscriber Server (HSS) or a User Subscription Database (USD) or a database entity, and the like, and is not described here.
  • HSS Home Subscriber Server
  • USD User Subscription Database
  • FIG. 3 shows one of the AMF devices, and the AMF device includes a database (Database, DB). At least one Load Balancer (LB) unit and at least two processing units.
  • the LB unit is configured to select a processing unit for the UE, and distribute the received NAS message to a corresponding processing unit.
  • the processing unit is configured to process the received NAS and other messages, and the multiple processing units can share the data in the database.
  • each LB unit and the processing unit have an external interface.
  • the external interface of the LB unit in the AMF device is configured as an external interface of the AMF device in the RAN device, and when the RAN device receives the After the NAS message sent by the UE in the idle state, the RAN device first selects an AMF device, then selects one of the LB unit interfaces configured in the RAN device from the AMF device, and then sends the NAS message to the AMF device through the selected LB unit interface. After receiving the NAS message, the LB unit allocates a processing unit for the NAS message. When the UE is in the connected state, the RAN device can directly communicate with the processing unit, and there is no need to forward data through the LB unit.
  • the AMF device in FIG. 2 can also be implemented in a group manner.
  • the AMF group includes a database, at least one LB unit, and at least two AMF instances.
  • the LB unit is configured to select an AMF instance for the UE, and distribute the received NAS message to the corresponding AMF instance.
  • the AMF instance is used to process the received NAS and other messages, and the multiple AMF instances may share the data in the data.
  • each LB unit and the AMF instance have an external interface.
  • the external interface of the LB unit is configured as an external interface of the AMF group in the RAN device, and when the RAN device receives the idle state.
  • the RAN device selects an AMF group, and then selects an LB unit interface of the AMF group, and sends the NAS message to the LB unit in the AMF group through the LB unit interface, and the LB unit receives
  • an AMF instance is assigned to the NAS message.
  • the RAN device can directly communicate with the AMF instance without having to forward data through the LB unit.
  • the SMF device saves the external interface information of the processing unit or the AMF instance serving the UE when the session is established or the session is activated, in the UE session context.
  • the SMF device needs to send a downlink message
  • the SMF device always sends the downlink message to the processing unit served last time for the UE according to the last interface information of the processing unit or the AMF instance that is saved for the UE in the UE session context. AMF instance.
  • the principle of the present application is: when the AMF device in FIG. 2 is implemented as FIG. 3, the processing unit in the AMF device carries the deletion in the session establishment request or the N2 release message sent to the SMF device. Instructing and SMF identification, and in the case that the SMF device receives the N2 release message, the SMF device can delete the interface information between the processing unit and the SMF device in the UE session context according to the deletion indication, so that the SMF device needs to send the downlink message.
  • the SMF device can only send the downlink message to the processing unit reselected according to the AMF identifier, thereby avoiding sending to the same processing unit each time.
  • the AMF instance in the AMF group carries the deletion indication and the AMF group identifier in the session establishment request or the N2 release message sent to the SMF device, and then received on the SMF device.
  • the SMF device can delete the interface information between the AMF instance and the SMF device in the UE session context according to the deletion indication, so that when the SMF device needs to send the downlink message, there is no AMF instance in the UE session context. Interface information with the SMF device, so the SMF device can only send downlink messages to the reselected AMF instance according to the AMF group identity, thus avoiding the load imbalance that occurs when sending downlink messages to the same AMF instance each time. problem.
  • the SMF device may include: a memory 501, a processor 502, a communication interface 503, and a bus 504. Connections between devices and mutual communication.
  • the communication interface 503 can be implemented by an antenna, and can be used for data interaction with an external network element.
  • the communication interface 503 of the SMF device can send and receive data packets or other information between the AMF device.
  • the processor 502 which may be a central processing unit (CPU), may be an application specific integrated circuit (ASIC), or one or more configured to implement the embodiments of the present invention. Integrated circuits. For example: one or more microprocessors (English: Digital Singnal Processor, DSP), or one or more Field Programmable Gate Arrays (FPGAs).
  • the processor 502 has a processing management function. Specifically, the processor 502 in the SMF device can process data or information sent by the received AMF device, the UPF device, or the PCRF device, or process information or data sent by other devices. .
  • the memory 501 may be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM) or other information storage instructions and instructions.
  • ROM read-only memory
  • RAM random access memory
  • Type of dynamic storage device or Electrostatic Erasable Programmable Read-Only Memory (EEPROM), Compact Disc Read-Only Memory (CD-ROM) or other optical disc storage, optical disc Storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program code in the form of instructions or data structures and can be Any other medium accessed by the computer, but is not limited to this.
  • Memory 501 can exist independently and is coupled to processor 502 via bus 504. Memory 501 can also be integrated with processor 502.
  • the first interface is an interface between the AMF device and the RAN device shown in FIG. 2 (corresponding to N2 in FIG. 2).
  • the second interface is an interface between the AMF device and the SMF device shown in FIG. 2, specifically an interface between the first device and the SMF device that is serving the UE in the AMF device.
  • the first device is a processing unit in the AMF device
  • the group to which the first device belongs is the AMF device where the processing unit is located
  • the second interface is one of the AMF devices.
  • the interface between the unit and the SMF device (corresponding to N11 in Figure 2).
  • the first device is an AMF instance in the AMF group
  • the group to which the first device belongs is the AMF group in which the AMF instance is located
  • the second The interface is an interface between an AMF instance and an SMF device in the AMF group (corresponding to N11 in FIG. 2).
  • the second device is a device that is re-determined for serving the UE after the SMF device deletes the second interface information between the first device and the SMF device saved in the UE session context.
  • the second device is one of the AMF devices.
  • the second device is an AMF instance in the AMF group.
  • an embodiment of the present application provides a method for message transmission.
  • the UE and the RAN are used.
  • the interaction process between the device, the AMF instance 1, the AMF instance 2, and the SMF device is described as an example.
  • the AMF instance 1 and the AMF instance 2 belong to the same AMF group.
  • the method includes three phases, and the first phase is The session establishment process corresponds to steps 601 to 603; the second phase is a process in which the UE enters an idle state, corresponding to steps 604 to 607; and the third phase is a process in which the UE re-enters the connection state when the SMF device needs to send a downlink message. Corresponding to steps 608 to 611.
  • the method specifically includes:
  • the UE sends a session establishment request to the AMF instance 1, and the AMF instance 1 receives the session establishment request.
  • the UE sends a session establishment request to the AMF instance 1 to trigger a user datagram protocol (PDU) session establishment process.
  • PDU user datagram protocol
  • the AMF instance 1 sends a session establishment request to the SMF device, and the SMF device receives the session establishment request.
  • the session establishment request may have the following three implementation manners.
  • the first type the second interface information (N11 interface information) of the AMF instance 1 is included in the session establishment request.
  • the second type the session establishment request includes the second interface information (N11 interface information) of the AMF instance 1, and the indication information of the AMF group to which the AMF instance 1 belongs.
  • the third type the session establishment request includes the second interface information (N11 interface information) of the AMF instance 1, the deletion indication, and the indication information of the AMF group to which the AMF instance 1 belongs.
  • the indication information of the AMF group may be an AMF group ID or a default route of the AMF group.
  • the indication information of the AMF group is taken as an example of the AMF group ID.
  • the AMF instance 1 needs to first determine whether the AMF group to which it belongs supports statelessness. If the AMF group supports stateless, the AMF instance 1 will carry the deletion indication. In the session establishment request. With reference to FIG. 4, the AMF group supports the stateless state, the AMF instance does not save the UE session context information, and the session context information of the UE served by each AMF instance in the AMF group is saved in the DB of the AMF group.
  • the AMF instances in the same AMF group can share the UE session context information stored in the DB, so that each AMF instance can process not only related information of the UEs served by itself but also related information of other UEs.
  • the deletion indication is used to instruct the SMF device to delete the second interface information in the UE session context stored by the SMF device when receiving the first interface release message.
  • the SMF device saves information carried in the session establishment request in a UE session context.
  • the session establishment request carries the second interface information of the AMF instance 1, because the AMF instance currently serving the UE is the AMF instance 1, so
  • the SMF device needs to save the second interface information of the AMF instance 1 in the UE session context, so that when the UE is in the connected state, the SMF device can directly access the AMF serving the UE by using the second interface information saved in the UE session context.
  • Example 1 sends a downlink message.
  • the SMF device further needs to save the indication information of the AMF group in the UE session context, and similarly, if the session establishment request further includes the deletion indication, the SMF device The deletion indication also needs to be saved in the UE session context.
  • the UE session context can be saved in the SMF device or in other devices with storage functions.
  • the foregoing steps 601 to 603 are the session establishment process. After the session is established, when the UE enters the idle state, the process of the UE entering the idle state needs to be performed.
  • the RAN device sends a first interface release request message to the AMF instance 1, and the AMF instance 1 receives the first interface release request message.
  • the AMF instance 1 device releases the first interface according to the first interface release request message.
  • the UE switches from the connected state to the idle state.
  • the AMF instance 1 sends a first interface release message to the SMF device, and the SMF device receives the first interface release message.
  • the first interface release message also includes three implementation manners.
  • the first interface release message may carry the deletion indication, the indication information of the AMF group to which the AMF instance 1 belongs, and the first interface release notification.
  • the first interface release message may carry the deletion indication and the first interface release notification.
  • the third type if the session establishment request is the third implementation manner described in step 602, the first interface release message may carry the first interface release notification.
  • AMF instance 1 is to carry the deletion indication in the first interface release message, it is necessary to first determine whether the AMF group to which it belongs supports stateless. If the AMF group supports stateless, AMF instance 1 will delete. The indication is carried in the first interface release message.
  • the SMF device deletes the second interface information in the UE session context according to the deletion indication, when the first interface release message is received.
  • the SMF device directly deletes the second interface information in the UE session context according to the deletion indication carried in the first interface release message. If the deletion indication is not carried in the first interface release message, and the deletion indication is saved in the UE session context, the SMF device deletes the second interface information according to the deletion indication saved in the UE session context.
  • the SMF device receives the first interface release message, indicating that the UE has entered the idle state, and the SMF device deletes the second interface information in the UE session context, so that the SMF device still avoids the UE session context when the UE re-enters the link state.
  • the second interface information in the AMF instance 1 is taken as an AMF instance serving the UE. At this time, since the second interface information does not exist in the UE session context, the AMF instance serving as the UE can only be re-selected in the AMF group, and the UE is always served by the same AMF instance.
  • steps 604 to 607 are the process of the UE entering the idle state. If the subsequent SMF device receives the downlink message for the UE, the following steps 608 to 611 are also performed to enable the UE to re-enter the connection state.
  • the SMF device When the SMF device needs to send a downlink message, the SMF device selects an AMF instance serving as the UE from the AMF group according to the AMF group ID, for example, AMF instance 2.
  • the SMF device may look up an AMF instance serving the UE from a Network Function Repository Function (NRF) device or other device according to the AMF group ID.
  • NRF Network Function Repository Function
  • the specific method for the SMF device to select an AMF instance for serving the UE according to the AMF group ID is the same as that of the prior art, and details are not described herein again.
  • the SMF device may save the interface information between the SMF device and the AMF instance 2 in the UE session context after reselecting the AMF instance 2 serving the UE, so that the UE is always connected. In the case of a state, the SMF device communicates directly with AMF instance 2 without having to reselect the AMF instance.
  • the SMF device may also save the interface information between the SMF device and the AMF instance 2 through the subsequent steps 610 to 611.
  • the SMF device sends a downlink message to the AMF instance 2 through the interface between the SMF device and the AMF instance 2.
  • the AMF instance 2 receives the downlink message.
  • the AMF instance 2 may also re-select an AMF instance for the UE, for example, AMF instance 3, and send the message to the AMF instance 3.
  • the downlink message, or the identifier of the AMF instance 3 is sent to the SMF device, and the SMF device sends a downlink message to the AMF instance 3.
  • steps 610 to 611 may also be performed.
  • the AMF instance 2 sends a response message to the SMF device, where the response message includes interface information between the AMF instance 2 and the SMF device, and the SMF device receives the response message.
  • the SMF device saves interface information between the AMF instance 2 and the SMF device in a UE session context.
  • the method for transmitting a message provided by the embodiment of the present application is that the SMF device in the prior art always selects an AMF instance that is served by the UE to provide a service for the UE.
  • the RAN is released in the RAN.
  • the SMF device deletes the interface information between the SMF device in the UE context and the AMF instance served by the UE, and then the SMF device needs to send the UE for the UE.
  • the interface information between the AMF instance serving the UE and the SMF device last time cannot be directly searched from the UE context, and the AMF instance served last time for the UE is not selected, but is re-selected.
  • the AMF instance avoids the load imbalance caused by the SMF device always selecting the AMF instance that was last served for the UE.
  • the indication information of the AMF group is taken as an example of the AMF group ID. In another implementation manner provided by the embodiment of the present application, the indication information of the AMF group is used. It can also be a default route of the AMF group. When the indication information of the AMF group is the default route of the AMF group, as shown in FIG. 7, the method can be implemented as the following steps 701 to 712.
  • the steps 701 to 707 are the same as the above steps 601 to 607, and the steps 711 to 712 are the same as the above steps 610 to 611, and details are not described herein again.
  • the SMF device When the SMF device needs to send the downlink message, the SMF device sends a downlink message to the device corresponding to the default route of the AMF group, and the device corresponding to the default route of the AMF group receives the downlink message.
  • the default route of the AMF group is directed to the ASF unit, where the ASF unit is a network function, which may be a default AMF instance in the AMF group, or may be a dedicated network function, for example, may be a load. Equalizer.
  • the ASF unit selects an AMF instance serving the UE, for example, AMF instance 2.
  • the ASF unit sends a downlink message to the AMF instance 2, and the AMF instance 2 receives the downlink message.
  • step 710 may be replaced by the ASF unit sending an identifier of the AMF instance 2 to the SMF device, and then the SMF device sends a downlink message to the AMF instance 2 according to the identifier of the AMF instance 2.
  • the embodiment corresponding to FIG. 6 and FIG. 7 is an implementation manner when the method for message transmission of the present application is applied to the scenario shown in FIG. 4.
  • the method for message transmission of the present application may also be In the scenario shown in FIG. 3, the interaction process between the UE, the RAN device, the processing unit 1, the processing unit 2, and the SMF device is taken as an example.
  • the processing unit 1 and the processing unit 2 belong to the same AMF.
  • the device as shown in Figure 8, includes:
  • the UE sends a session establishment request to the processing unit 1, and the processing unit 1 receives the session establishment request.
  • the UE sends the session establishment request to the processing unit 1 to trigger the process of establishing the PDU session.
  • the UE initiates the process of establishing the PDU session, the UE is in a connected state, and the UE is serving the processing unit 1 at this time.
  • the processing unit 1 sends a session establishment request to the SMF device, and the SMF device receives the session establishment request.
  • the session establishment request may have the following three implementation manners.
  • the first type the session establishment request includes the second interface information (N11 interface information) of the processing unit 1.
  • the second type the session establishment request includes the second interface information (N11 interface information) of the processing unit 1 and the indication information of the AMF device to which the processing unit 1 belongs.
  • the third type the session establishment request includes the second interface information (N11 interface information) of the processing unit 1, the deletion indication, and the indication information of the AMF device to which the processing unit 1 belongs.
  • the indication information of the AMF device may be an AMF device ID or a default route of the AMF device.
  • the indication information of the AMF device is taken as an AMF device ID as an example for description.
  • the SMF device saves information carried in the session establishment request in a UE session context.
  • the second interface information of the processing unit 1 is carried in the session establishment request, because the processing unit currently serving the UE is the processing unit 1, so
  • the SMF device needs to save the second interface information of the processing unit 1 in the UE session context, so that when the UE is in the connected state, the SMF device can directly process the service for the UE by using the second interface information saved in the UE session context.
  • Unit 1 sends a downlink message.
  • the SMF device further needs to save the indication information of the AMF device in the UE session context.
  • the SMF device needs to The deletion indication is saved in the UE session context.
  • the foregoing steps 801 to 803 are the session establishment process. After the session is established, when the UE enters the idle state, the process of the UE entering the idle state needs to be performed.
  • the RAN device sends a first interface release message to the processing unit 1, and the processing unit 1 receives the first interface release message.
  • the processing unit 1 releases the first interface according to the first interface release message.
  • the processing unit 1 releases the first interface between the processing unit 1 and the RAN, the UE is switched from the connected state to the idle state.
  • the processing unit 1 sends a first interface release message to the SMF device, and the SMF device receives the first interface release message.
  • the first interface release message also includes three implementation manners.
  • the first interface release message may carry the deletion indication, the indication information of the AMF group to which the processing unit 1 belongs, and the first interface release notification.
  • the first interface release message may carry the deletion indication and the first interface release notification.
  • the first interface release message may carry the first interface release notification.
  • each processing unit of the AMF device supports stateless means that the UE session context information is not saved in each processing unit, and the UE served by each processing unit The session context information is saved in the DB, and the processing unit in the same AMF device can share the UE session context information stored in the DB.
  • the SMF device deletes the second interface information in the UE session context according to the deletion indication, when the first interface release message is received.
  • the SMF device directly deletes the second interface information in the UE session context according to the deletion indication carried in the first interface release message. If the deletion indication is not carried in the first interface release message, and the deletion indication is saved in the UE session context, the SMF device deletes the second interface information according to the deletion indication saved in the UE session context.
  • the SMF device receives the first interface release message, indicating that the UE has entered the idle state, and the SMF device deletes the second interface information in the UE session context, so that the SMF device still avoids the UE session context when the UE re-enters the link state.
  • the second interface information in the processing unit 1 is treated as a processing unit serving the UE. At this time, since the second interface information does not exist in the UE session context, the processing unit serving as the UE can only be reselected in the SMF device, and the UE is always served by the same processing unit.
  • steps 804 to 807 are the process of the UE entering the idle state. If the subsequent SMF device receives the downlink message for the UE, the following steps 808 to 811 are also performed to enable the UE to re-enter the connection state.
  • the SMF device When the SMF device needs to send a downlink message, the SMF device selects an ASF unit of the AMF device according to the AMF device ID.
  • the SMF device can search for an external interface of the AMF device from the NRF device or other device according to the AMF device ID, and the interface can be the transport layer information of the ASF unit.
  • the ASF unit may be one LB unit in the AMF device, or may be one processing unit in the AMF device.
  • the SMF device may directly send a downlink message to the processing unit, and the processing unit provides a service for the UE, or the processing unit receives the downlink message sent by the SMF device.
  • the following steps 810 to 811 may also be performed to reselect the processing unit serving the UE and send the downlink message to the reselected processing unit.
  • the SMF device sends a downlink message to the ASF unit, and the ASF unit receives the downlink message.
  • steps 810 to 811 may also be performed.
  • the ASF unit selects a processing unit serving the UE, for example, the processing unit 2.
  • the ASF unit sends a downlink message to the processing unit 2, and the processing unit 2 receives the downlink message.
  • the ASF unit may further send an identifier of the processing unit 2 to the SMF device, and the SMF device sends a downlink message to the processing unit 2 according to the identifier of the processing unit 2.
  • steps 812 to 813 may also be performed.
  • the processing unit 2 sends a response message to the SMF device, where the response message includes interface information between the processing unit 2 and the SMF device, and the SMF device receives the response message.
  • the SMF device saves interface information between the processing unit 2 and the SMF device in a UE session context.
  • the method for message transmission provided by the embodiment of the present application, after the RAN releases the interface between the RAN and the processing unit serving the UE, the SMF device will between the SMF device in the UE context and the processing unit serving the UE.
  • the interface is deleted, and when the SMF device needs to send a downlink message, the process of selecting the processing unit needs to be triggered again, and load balancing between the processing units can be implemented.
  • the solution provided by the embodiment of the present invention is mainly introduced from the perspective of the SMF device. It can be understood that the SMF device includes corresponding hardware structures and/or software modules for performing various functions.
  • the present application can be implemented in a combination of hardware or hardware and computer software in combination with the elements and algorithm steps of the various examples described in the embodiments disclosed herein. Whether a function is implemented in hardware or computer software to drive hardware depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.
  • the embodiment of the present application may divide the function module into the SMF device according to the foregoing method example.
  • each function module may be divided according to each function, or two or more functions may be integrated into one processing module.
  • the above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiments of the present application is schematic, and is only a logical function division, and may be further divided in actual implementation.
  • FIG. 9 shows a possible structural diagram of the SMF device involved in the above embodiment.
  • the SMF device includes: a receiving module 901, a deleting module 902, and a sending module 903.
  • the receiving module 901 is configured to receive the deletion indication from the first device and the indication information of the group to which the first device belongs, and the deletion indication is used to instruct the deletion module 902 to delete the user when the receiving module 901 receives the first interface release message. Second interface information in the device UE session context.
  • the deleting module 902 is configured to delete the second interface information in the UE session context according to the deletion indication if the receiving module 901 receives the first interface release message.
  • the sending module 903 is configured to send a downlink message to the second device when the downlink message needs to be sent.
  • the device further includes: a storage module 904.
  • the receiving module 901 is specifically configured to receive a session establishment request from the first device, where the session establishment request includes the group indication information, the deletion indication, and the second interface information.
  • the storage module 904 is configured to save the indication information of the group, the deletion indication, and the second interface information in a UE session context.
  • the deleting module 902 is specifically configured to: when the receiving module receives the first interface release message sent by the first device, delete the second interface information in the UE session context according to the deletion indication in the UE session context.
  • the receiving module 901 is specifically configured to receive a session establishment request from the first device, where the session establishment request includes the group indication information and the second interface information, and the receiving The first interface from the first device releases the message, and the first interface release message includes a deletion indication.
  • the storage module 904 is configured to save the indication information of the group and the second interface information in a UE session context.
  • the receiving module 901 is specifically configured to receive a session establishment request from the first device, where the session establishment request includes second interface information, and receive from the first device.
  • the first interface releases the message, and the first interface release message includes the group indication information and the deletion indication.
  • the storage module 904 is configured to save the second interface information in a UE session context.
  • the deleting module 902 is specifically configured to delete the second interface information in the session context of the UE according to the deletion indication included in the first interface release message.
  • the indication information of the group is a group identity ID of the group
  • the sending module 903 is specifically configured to determine, according to the group ID, a second device that is served by the UE, and send, by using an interface between the device for transmitting the message and the second device, a downlink message to the second device.
  • the indication information of the group is a default route of the group
  • the sending module 903 is specifically configured to send a downlink message to the device corresponding to the default route of the group, receive the second device identifier of the device corresponding to the default route of the group, and the second device is the default route corresponding to the group.
  • the device is a second device selected by the UE.
  • the second device corresponding to the second device identifier received by the receiving module sends a downlink message to the second device corresponding to the second device identifier.
  • the indication information of the group is a default route of the group
  • the sending module 903 is configured to send, by the device corresponding to the default route of the group, a downlink message to the second device, where the device corresponding to the default route of the second device is the second device selected by the UE.
  • the storage module 904 is configured to save the interface information between the device for transmitting the message and the second device in the UE session context after the receiving module 901 receives the message from the second device.
  • the receiving module 901 is configured to support the SMF device to receive the session establishment request sent in step 602 in FIG. 6, the first interface release message sent in step 606, the response message sent in step 610, and FIG.
  • the first interface release message sent in step 702, the first interface release message sent in step 706, and the response message sent in step 711 is further used to support the SMF device to receive the session establishment request sent in step 802 in FIG. 8, and the step 806 sends the message.
  • the first interface releases the message and the response message sent in step 812.
  • the deleting module 903 is configured to support the SMF device to perform step 607 in FIG. 6, step 707 in FIG. 7, and step 807 in FIG.
  • the sending module 903 is configured to support the SMF device to perform step 609 in FIG. 6, step 708 in FIG. 7, and step 809 in FIG.
  • the storage module 904 is configured to support the SMF device to perform step 603 and step 611 in FIG. 6, step 703 and step 712 in FIG. 7, step 803 and step 813 in FIG.
  • the receiving module 901 and the transmitting module 903 shown in FIG. 9 can be integrated in the communication interface 503 shown in FIG. 5, so that the communication interface 503 executes the receiving module 901 and transmits.
  • the delete module 902 can be integrated into the processor 502 shown in FIG. 5, causing the processor 502 to perform the specific functions of the delete module 902.
  • the storage module 904 can be integrated in the memory 501 shown in FIG. 5 to cause the memory 501 to perform the specific functions of the storage module 904.
  • FIG. 10 in order to solve the problem of load imbalance in the prior art, another embodiment of the present application provides a data transmission method.
  • the UE and the RAN device are used.
  • the process of the interaction between the AMF instance and the SMF device is described as an example.
  • the AMF instance 1 and the AMF instance 2 belong to the same AMF group.
  • the method includes three phases.
  • the first phase is a session establishment process, and the corresponding step is 1001.
  • the second phase is a process in which the UE enters an idle state, corresponding to step 1004 to step 1007;
  • the third phase is a process in which the UE re-enters the connection state when the SMF device needs to send a downlink message, corresponding to step 1008 to step 1009.
  • the method specifically includes:
  • the UE sends a session establishment request to the AMF instance 1, and the AMF instance 1 receives the session establishment request.
  • the UE sends the session establishment request to the AMF instance 1 to trigger the establishment of the PDU session.
  • the UE initiates the process of establishing the PDU session, the UE is in the connected state, and the UE is serving the AMF instance 1 at this time.
  • the AMF instance 1 sends a session establishment request to the SMF device, and the AMF instance 1 receives the session establishment request.
  • the session establishment request may have the following three implementation manners.
  • the first type the information of the AMF instance 1 is included in the session establishment request.
  • the information of the AMF instance 1 is used by the SMF device to address the AMF instance.
  • the information of the AMF instance 1 may be an AMF instance identifier, a uniform resource identifier (URI) of the service endpoint in the AMF instance, or an AMF instance.
  • the second type the session establishment request includes the information of the AMF instance 1 and the indication information of the AMF group to which the AMF instance 1 belongs.
  • the third type the session establishment request includes the AMF instance 1 information, the stateless indication information, and the indication information of the AMF group to which the AMF instance 1 belongs.
  • the indication information of the AMF group may be an AMF group ID or a default route of the AMF group.
  • the indication information of the AMF group is taken as an example of the AMF group ID.
  • the AMF instance 1 needs to first determine whether the AMF group to which it belongs supports the stateless mode. If the AMF group supports the stateless mode, the AMF instance 1 will be stateless. The indication information is carried in the session establishment request. With reference to FIG. 4, the AMF group supports the stateless mode, that is, the AMF instance does not save the UE session context information when the UE is in the idle state, and the session context information of the idle state UE served by each AMF instance in the AMF group is The AMF instances in the same AMF group can share the UE session context information stored in the DB, so that each AMF instance can process not only related information of the UEs served by itself, but also can be processed. Information about other UEs.
  • the stateless indication information is used to indicate that the SMF device needs to send a downlink message to the AMF instance after the SMF device needs to send the downlink message to the AMF instance, and the SMF device needs to follow the indication information of the AMF group.
  • the AMF instance is reselected from the AMF group and the downstream message is sent to the newly selected AMF instance.
  • the stateless indication information may be a single indication information, for example, carrying a bit in the message to indicate that the AMF group works in the stateless mode, or may be embodied in other manners, for example, carrying a special AMF in the message.
  • the pointer indicates that the AMF group works in stateless mode (for example, if the AMF pointer identifier carried in the message is 1111, the AMF group works in the stateless mode).
  • the binding release of the signaling connection to the first interface includes but is not limited to the following two cases:
  • the first type the signaling connection corresponding to the UE is released, and the binding of the signaling connection to the first interface is also released.
  • the second type the binding of the signaling connection to the first interface is released, and the signaling connection corresponding to the UE is not released.
  • the signaling in the signaling connection may refer to a Next Generation Application Protocol (NGAP) signaling, or may be an N2 reference application protocol (N2AP).
  • NGAP Next Generation Application Protocol
  • N2AP N2 reference application protocol
  • the SMF may further obtain the foregoing stateless indication information from the local configuration information according to the indication information of the AMF group.
  • the SMF device saves information carried in the session establishment request in a UE session context.
  • the session establishment request carries the information of the AMF instance 1, because the AMF instance currently serving the UE is the AMF instance 1, so the SMF device needs The information of the AMF instance 1 is saved in the UE session context, so that when the UE is in the connected state, the SMF device can directly send the downlink message to the AMF instance 1 serving the UE by directly using the information of the AMF instance 1 saved in the UE session context. .
  • the SMF device further needs to save the indication information of the AMF group in the UE session context.
  • the SMF device further needs to save the stateless indication information in the UE session context, or alternatively, the SMF device may save the stateless indication information in the AMF group. Group or AMF corresponding context.
  • the UE session context can be saved in the SMF device or in other devices with storage functions.
  • the above steps 1001 to 1003 are the session establishment process. After the session is established, when the UE enters the idle state, the process of the UE entering the idle state needs to be performed.
  • the RAN device sends a release message to the AMF instance 1, and the AMF instance 1 receives the release message.
  • the release message is used to indicate that the AMF instance 1 releases the binding of the signaling connection corresponding to the UE to the first interface.
  • the AMF instance 1 device releases the binding of the signaling connection corresponding to the UE to the first interface according to the release message.
  • the UE switches from the connected state to the idle state.
  • the AMF instance 1 sends a session update request or a release notification to the SMF device, where the session update request includes a release reason, and the SMF device receives the session update request or the release notification.
  • the reason for the release is used to indicate the reason for the release of the binding of the signaling connection corresponding to the UE to the first interface.
  • the release notification is used to indicate that the binding of the signaling connection corresponding to the UE to the first interface has been released.
  • the session update request message also includes three implementation manners.
  • the session update request may carry the indication information and the release reason of the AMF group to which the AMF instance 1 belongs.
  • the optional session update request may also carry stateless indication information.
  • the session update request may carry the release reason.
  • the optional session update request may also carry stateless indication information.
  • the third type If the session establishment request is the third implementation manner described in step 1002, the session update request message may carry the release reason.
  • the AMF instance 1 is to carry the stateless indication information in the session update request message, it is necessary to first determine whether the AMF group to which it belongs supports the stateless mode. If the AMF group supports the stateless mode, the AMF instance 1 The stateless indication information will be carried in the session update request.
  • the release notification also includes the above three implementations.
  • the AMF instance 1 may also send a notification that the UE enters the idle state to the SMF device. Similarly, entering the idle state notification also includes the above three implementations.
  • the SMF device determines, according to the release reason, the release notification, or the UE to enter the idle state notification, that the binding connection of the signaling connection corresponding to the UE and the first interface is released.
  • the SMF device deletes information of the AMF instance 1 in the UE session context according to the stateless indication information.
  • the SMF device directly deletes the information of the AMF instance 1 in the UE session context according to the stateless indication information carried in the session update request. If the state update indication message is not carried in the session update request message, and the stateless indication information is saved in the UE session context, the SMF device deletes the information of the AMF instance 1 according to the stateless indication information saved in the UE session context. In addition, the SMF device can obtain the stateless indication information from the local configuration information according to the information of the configured AMF group, and delete the information of the AMF strength 1 according to the stateless indication information in the local configuration information.
  • the SMF device determines that the UE has entered the idle state according to the received session update request or the release notification or according to the received UE entering the idle state notification. At this time, the SMF device deletes the information of the AMF instance 1 in the UE session context, and the UE can be avoided. Upon re-entering the connection state, the SMF device still uses AMF instance 1 as the AMF instance serving the UE according to the information of AMF instance 1 in the UE session context. At this time, since the AMF instance 1 information does not exist in the UE session context, the AMF instance serving as the UE can only be re-selected in the AMF group, and the same AMF instance is always used to serve the UE.
  • the SMF device does not delete the information of the AMF instance 1 in step 1007, and the SMF device determines that the UE has entered the idle state according to receiving the session update request or the release notification or according to the received UE entering the idle state notification. State, the SMF device sets the UE's Connection Management (CM) state to the idle state.
  • CM Connection Management
  • steps 1004 to 1007 are the process of the UE entering the idle state. If the subsequent SMF device receives the downlink message for the UE, the following steps 1008 to 1009 are also performed to enable the UE to re-enter the connection state.
  • the SMF device When the SMF device needs to send a downlink message, the SMF device selects an AMF instance serving as the UE from the AMF group according to the AMF group ID, for example, AMF instance 2.
  • the SMF device when the SMF device needs to send the downlink message, it may be determined whether the binding of the signaling connection corresponding to the UE and the first interface is released, and if it is determined that the binding of the signaling connection corresponding to the UE to the first interface is released, According to the AMF group ID, an AMF instance serving the UE is selected from the AMF group.
  • the SMF device queries the UE session context. If the information of the AMF instance is not saved in the UE session context, the SMF device selects an AMF instance serving the UE according to the AMF group ID.
  • the SMF device determines that the CM status of the UE is in an idle state, and the SMF device receives the stateless indication information from the AMF instance 1 (as in step 1001 or 1006) or the SMF device determines the AMF group according to the configuration.
  • the SMF device selects an AMF instance serving the UE according to the AMF group ID even if the AMF instance information is saved in the UE session context.
  • the SMF device may look up an AMF instance serving the UE from a Network Function Repository Function (NRF) device or other device according to the AMF group ID.
  • NRF Network Function Repository Function
  • the specific method for the SMF device to select an AMF instance for serving the UE according to the AMF group ID is the same as that of the prior art, and details are not described herein again.
  • the SMF device may save the information of the AMF instance 2 in the UE session context after reselecting the AMF instance 2 serving the UE, so that the SMF device directly communicates with the AMF instance 2 when the UE is always in the connected state. There is no need to re-select the AMF instance.
  • the SMF device sends a downlink message to the AMF instance 2, and the AMF instance 2 receives the downlink message.
  • the AMF instance 2 may also re-select an AMF instance for the UE, for example, AMF instance 3, and send the message to the AMF instance 3.
  • the downlink message, or the identifier of the AMF instance 3 is sent to the SMF device, and the SMF device sends a downlink message to the AMF instance 3.
  • the method for transmitting a message provided by the embodiment of the present application is that the SMF device in the prior art always selects an AMF instance that is served by the UE to provide a service for the UE.
  • the RAN is released in the RAN.
  • the SMF device deletes the information of the AMF instance in the UE context, and then the SMF device needs to send the UE for the UE.
  • the downlink message When the downlink message is used, it is impossible to directly search for the information of the AMF instance that was last served for the UE from the UE context, and instead of continuing to select the AMF instance that was last served for the UE, the AMF instance is reselected, thus avoiding The SMF device always selects the load imbalance caused by the last AMF instance served for the UE.
  • the embodiment of the present application provides a device for message transmission, and the device can be implemented as the SMF device in the above embodiment.
  • FIG. 11 shows another possible structural diagram of the SMF device involved in the above embodiment.
  • the SMF device includes an acquisition module 1101 and a transmission module 1102.
  • the obtaining module 1101 is configured to obtain the stateless indication information and the group indication information of the group to which the first device belongs, where the stateless indication information is used to indicate that after determining that the binding of the signaling connection corresponding to the user equipment UE and the first interface is released
  • the second device that is used for serving the UE is selected according to the group indication information, where the first device is a device that serves the UE before the binding of the signaling connection and the first interface is released, and the first interface is a wireless connection. The interface between the incoming network RAN and the first device.
  • the sending module 1102 is configured to: when the obtaining module 1101 receives the release notification from the first device, when the downlink message needs to be sent, send a downlink message to the second device, where the second device is determined according to the group indication information.
  • the release notification is used to indicate that the binding of the signaling connection corresponding to the UE to the first interface has been released.
  • the apparatus further includes a determining module 1103.
  • the determining module 1103 is configured to determine binding release of the signaling connection corresponding to the UE and the first interface.
  • the determining module 1103 is further configured to: if the sending module needs to send a downlink message, and the determining module 1103 determines that the signaling connection corresponding to the UE is released from the first interface, Then determining a second device for serving the UE according to the group indication information.
  • the acquiring module 1101 is specifically configured to receive a session establishment request from the first device, where the session establishment request includes the group indication information; or, the receiving is from the first A release notification of the device, and the group notification information is included in the release notification.
  • the acquiring module 1101 is configured to receive a session establishment request from the first device, where the session establishment request includes stateless indication information, or receive the information from the first device.
  • the release notification includes the stateless indication information; or the stateless indication information is obtained from the local configuration information.
  • the apparatus further includes a deleting module 1104.
  • the deleting module 1104 is configured to delete the information of the first device in the UE session context according to the stateless indication information after the obtaining module 1101 receives the release notification from the first device.
  • the device further includes: a storage module 1105.
  • the storage module 1105 is configured to save the release state of the binding of the signaling connection and the first interface after the obtaining module 1101 receives the release notification from the first device.
  • the determining module 1103 is further configured to determine that the binding of the signaling connection to the first interface is released according to the release state of the binding of the signaling connection with the first interface;
  • the determining module 1103 is further configured to: if the sending module 1102 needs to send a downlink message, and the determining module 1103 determines that the binding of the signaling connection to the first interface is released according to the release state of the binding of the signaling connection with the first interface. And determining, according to the group indication information, a second device for serving the UE.
  • the group indication information is a group identity ID of the group to which the first device belongs;
  • the determining module 1103 is specifically configured to: if the sending module 1102 needs to send a downlink message, and the determining module 1103 determines that the binding of the signaling connection to the first interface is released according to the release state of the binding of the signaling connection and the first interface, The group ID is determined to be the second device served by the UE.
  • the acquiring module 1101 is configured to support the SMF device to obtain the session establishment request sent by step 1002 in FIG. 10, and the first interface sent by the step 1006 releases the message.
  • the sending module 1102 is configured to support the SMF device to perform step 1009 in FIG.
  • the deleting module 1104 is configured to support the SMF device to perform step 1007 in FIG.
  • the determining module 1103 is configured to support the SMF device to perform step 1008 in FIG.
  • the storage module 1105 is configured to support the SMF device to perform step 1003 in FIG.
  • the obtaining module 1101 and the transmitting module 1102 shown in FIG. 11 may be integrated in the communication interface 503 shown in FIG. 5, so that the communication interface 503 executes the obtaining module 1101 and transmits.
  • the determination module 1103 and the deletion module 1104 can be integrated into the processor 502 shown in FIG. 5, causing the processor 502 to perform the specific functions of the determination module 1103 and the deletion module 1104.
  • the storage module 1105 can be integrated in the memory 501 shown in FIG. 5 to cause the memory 501 to perform the specific functions of the storage module 1105.
  • Embodiments of the present application also provide a computer storage medium for storing computer software instructions for use in the above-described SMF device, the device comprising a program designed to perform the steps performed by the SMF device in the above embodiment.
  • Embodiments of the present application also provide a computer program product, such as a computer readable storage medium, including a program designed to perform the steps performed by the SMF device in the above-described embodiments.
  • the steps of a method or algorithm described in connection with the present disclosure may be implemented in a hardware or may be implemented by a processor executing software instructions.
  • the software instructions may be composed of corresponding software modules, which may be stored in a random access memory (RAM), a flash memory, a read only memory (ROM), an erasable programmable read only memory ( Erasable Programmable ROM (EPROM), electrically erasable programmable read only memory (EEPROM), registers, hard disk, removable hard disk, compact disk read only (CD-ROM) or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium.
  • the storage medium can also be an integral part of the processor.
  • the processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in a core network interface device.
  • the processor and the storage medium may also exist as discrete components in the core network interface device.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical or otherwise.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network devices. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each functional unit may exist independently, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.
  • the present application can be implemented by means of software plus necessary general hardware, and of course, by hardware, but in many cases, the former is a better implementation. .
  • the technical solution of the present application which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a readable storage medium, such as a floppy disk of a computer.
  • a hard disk or optical disk, etc. includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present application.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne le domaine de la technologie de communication et concerne un procédé et un appareil destinés à une transmission de messages permettant de résoudre un problème de déséquilibre de charge entre des dispositifs desservant un UE. Le procédé de la présente invention comprend les étapes suivantes : un dispositif de fonction de gestion de session reçoit une instruction de suppression provenant d'un premier dispositif et des informations d'indication d'un groupe auquel le premier dispositif appartient; si le dispositif de fonction de gestion de session a reçu un premier message de libération d'interface provenant du premier dispositif, de secondes informations d'interface dans un contexte de session d'UE sont supprimées conformément à l'instruction de suppression; et lorsqu'un message de liaison descendante doit être envoyé, le dispositif de fonction de gestion de session envoie le message de liaison descendante à un second dispositif, le second dispositif étant un dispositif qui est déterminé, en fonction des informations d'indication du groupe, en tant que dispositif desservant l'UE. La présente invention est appliquée au processus de la transmission de messages.
PCT/CN2018/084729 2017-05-03 2018-04-27 Procédé et appareil destinés à une transmission de messages WO2018201973A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201710305752.2 2017-05-03
CN201710305752 2017-05-03
CN201810289567.3A CN108810988B (zh) 2017-05-03 2018-04-03 一种消息传输的方法及装置
CN201810289567.3 2018-04-03

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102378295A (zh) * 2010-08-23 2012-03-14 中兴通讯股份有限公司 承载释放方法及系统
CN103428787A (zh) * 2012-05-17 2013-12-04 大唐移动通信设备有限公司 一种基站切换方法及装置
CN105813079A (zh) * 2016-05-17 2016-07-27 工业和信息化部电信研究院 一种终端接入方法
WO2017029909A1 (fr) * 2015-08-17 2017-02-23 株式会社Ｎｔｔドコモ Système de communication sans fil, dispositif de passerelle, entité de gestion de mobilité, et procédé de commande de communication

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102378295A (zh) * 2010-08-23 2012-03-14 中兴通讯股份有限公司 承载释放方法及系统
CN103428787A (zh) * 2012-05-17 2013-12-04 大唐移动通信设备有限公司 一种基站切换方法及装置
WO2017029909A1 (fr) * 2015-08-17 2017-02-23 株式会社Ｎｔｔドコモ Système de communication sans fil, dispositif de passerelle, entité de gestion de mobilité, et procédé de commande de communication
CN105813079A (zh) * 2016-05-17 2016-07-27 工业和信息化部电信研究院 一种终端接入方法

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