WO2019091195A1 - Procédé de sélection de service et de mode de continuité de session, élément de réseau de communication et support de stockage - Google Patents

Procédé de sélection de service et de mode de continuité de session, élément de réseau de communication et support de stockage Download PDF

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Publication number
WO2019091195A1
WO2019091195A1 PCT/CN2018/103338 CN2018103338W WO2019091195A1 WO 2019091195 A1 WO2019091195 A1 WO 2019091195A1 CN 2018103338 W CN2018103338 W CN 2018103338W WO 2019091195 A1 WO2019091195 A1 WO 2019091195A1
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Prior art keywords
ssc mode
ssc
optional
terminal
slice
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PCT/CN2018/103338
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English (en)
Chinese (zh)
Inventor
王丹
孙滔
陈炜
陆璐
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中国移动通信有限公司研究院
中国移动通信集团有限公司
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Publication of WO2019091195A1 publication Critical patent/WO2019091195A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements

Definitions

  • the present application relates to the field of communications technologies, but is not limited to the field of communications technologies, and in particular, to a service continuity mode selection method, a communication network element, and a storage medium.
  • SSC mode 1 The terminal always accesses only one user plane gateway and does not replace the Internet Protocol (IP) anchor point.
  • IP Internet Protocol
  • SSC mode 2 The terminal accesses a user plane gateway in a specific area; if the area is beyond the specific area, the terminal is disconnected from the user plane gateway in the specific area, and the user plane in the current area is accessed. Gateway.
  • the characteristics of SSC Mode 2 are: first removed and built.
  • SSC mode 3 The terminal establishes a connection with another user plane gateway before disconnecting from the currently connected user plane gateway.
  • the characteristics of SSC Mode 3 are: first built and then removed.
  • the SSC mode is usually selected as follows:
  • the terminal selects the appropriate SSC mode according to the information about the currently selected service, and sends it to the session management function (SMF) in the session establishment request to comprehensively consider the SSC provided by the UE itself.
  • SMF session management function
  • the second type When the terminal sends a session establishment request, the session establishment request does not carry the SSC mode that it considers appropriate. At this time, the SMF selects the SSC mode suitable for the current session according to the contracted SSC mode, and informs the terminal.
  • the SSC mode provided by the above two methods is not suitable for the SSC mode in the current communication scenario, and cannot meet the delay and/or continuity requirements in the current communication scenario.
  • the embodiments of the present application are expected to provide a service continuity mode selection method, a communication network element, and a storage medium.
  • the embodiment of the present application provides a service continuity SSC mode selection method, which is applied to a session management function network element SMF, and includes:
  • the SSC mode used is selected from the selectable SSC mode.
  • a second aspect of the embodiment of the present application is a service continuity SSC mode selection method, which is applied to a subscription database, and includes:
  • mapping relationship Querying the mapping relationship to determine an optional SSC mode corresponding to the slice identifier
  • the third aspect of the embodiment of the present application provides a communication network element, where the communication network element is a session management function network element SMF, including:
  • An obtaining unit configured to acquire an optional SSC mode of the session establishment request according to the slice identifier of the network slice and the mapping relationship of the SSC mode;
  • a selection unit configured to select an SSC mode to use from the selectable SSC mode.
  • a fourth aspect of the embodiments of the present disclosure provides a communication network element, where the communication network element is a subscription database, including:
  • a storage unit configured to store a slice identifier of the network slice, a mapping relationship between the data network name DNN and the SSC mode;
  • a receiving unit configured to receive a query request that is sent by the session management function network element SMF and that carries at least the slice identifier
  • a querying unit configured to query the mapping relationship to determine an optional SSC mode corresponding to the slice identifier
  • a sending unit configured to return an optional SSC mode of the query to the SMF; wherein the optional SSC mode is used by the SMF to select an SSC mode for use.
  • a fifth aspect of the embodiments of the present application provides a communication network element, including: a transceiver, a memory, a processor, and a computer program stored on the memory and executed by the processor;
  • the processor is respectively connected to the transceiver and the memory, configured to implement one or more of the foregoing business continuity SSC mode selection methods applied in the SMF by executing the computer program, or applied to a subscription database One or more of the business continuity SSC mode selection methods.
  • a sixth aspect of the embodiments of the present application provides a computer storage medium, where the computer storage medium stores a computer program, and after the computer program is executed, the foregoing one of the business continuity SSC mode selection methods applied in the SMF can be implemented or Multiple, or one or more of the business continuity SSC mode selection methods applied in the contract database.
  • the service continuity mode selection method, the communication network element, and the storage medium provided by the embodiment of the present application when selecting the SSC mode for establishing and/or disassembling the connection with the user plane gateway for the terminal, is based on the slice of the network slice that the session needs to use.
  • the identification is performed, and the selected SSC mode is adapted to the attribute of the network slice used by the current session of the terminal, so that the SSC mode more suitable for the current communication scenario can be selected, thereby improving the communication quality.
  • FIG. 1A is a schematic flowchart diagram of a method for selecting a first SSC mode according to an embodiment of the present application
  • FIG. 1B is a schematic flowchart of a method for selecting a second SSC mode according to an embodiment of the present application
  • FIG. 2 is a schematic flowchart of a method for selecting a third SSC mode according to an embodiment of the present application
  • FIG. 3 is a schematic flowchart diagram of a method for selecting a fourth SSC mode according to an embodiment of the present application
  • FIG. 4 is a schematic structural diagram of an SMF according to an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of a subscription database according to an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a communication network element according to an embodiment of the present application.
  • FIG. 7 is a schematic diagram of a network architecture according to an embodiment of the present application.
  • FIG. 8 is a schematic flowchart diagram of a fifth method for selecting an SSC mode according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic flowchart diagram of a sixth method for selecting an SSC mode according to an embodiment of the present disclosure.
  • the present embodiment provides an SSC mode selection method, which is applied to a session management function network element SMF, and includes:
  • Step S110 Acquire an optional SSC mode of the session establishment request according to the mapping relationship between the slice identifier of the network slice and the SSC mode.
  • Step S120 Select the SSC mode to be used from the optional SSC mode.
  • the session establishment request is request information for requesting establishment of a session.
  • the SSC mode used may be the SSC mode used by the session that the request establishment session currently requests to establish.
  • the SSC mode selection method provided in this embodiment is applicable to the SMF, and receives a session establishment request of the terminal through the SMF, where the session establishment request may be a session establishment request for establishing a Protocol Data Unit (PDU).
  • PDU Protocol Data Unit
  • the method can include:
  • Step S111 Receive a session establishment request that is sent by the terminal and carries a slice identifier.
  • Step S112 Query a mapping relationship between the slice identifier and the SSC mode to determine an optional SSC mode corresponding to the slice identifier carried in the session establishment request.
  • Step S120 Select the SSC mode to be used from the optional SSC mode.
  • the session establishment request carries a slice identifier
  • the slice identifier may be an identifier of a network slice that is required to be used by the currently requested session.
  • the slice identifier may be a unique identifier function such as a serial number or a name of the network slice, and may also be referred to as a slice ID.
  • the network slice can be: for a communication scenario requirement of different vertical industries, a customized mobile network can be designed for the 5G network.
  • enhanced mobile broadband (eMBB) slices are used to provide eMBB services to enable the provision of high-capacity, high-bandwidth services.
  • Making Internet Internet of Thing (mIoT) slices can provide large connection small packet service and support IoT terminal access.
  • one terminal can access multiple slices at the same time as needed or according to the contract. At this point, the AMFs of the multiple slices are shared, and the SMF is not shared.
  • the session establishment request may carry a slice identifier.
  • the SMF may query the SSC mode that has a mapping relationship with the slice identifier carried in the session establishment request, based on the slice identifier, before the session is established.
  • the SSC mode queried here is an optional SSC mode, which is also referred to as an optional SSC mode in the embodiment of the present application.
  • the SSC mode may be one or more of the foregoing SSC mode 1, SSC mode 2, and SSC mode 3.
  • the SSC mode having a mapping relationship with the slice identifier of the network slice may be a predetermined SSC mode adapted to the slice attribute of the network slice and/or the provided service attribute, and the network can be satisfied when the network slice is used to provide the network service
  • the network attributes may include: network transmission delay, network reliability, bandwidth, and access information supported by the network slice.
  • the service attributes may include: service allowed delay and quality of service (QoS).
  • Querying the optional SSC mode in step S110 may include at least one of the following:
  • the SMF locally queries the mapping relationship to obtain an SSC mode usable by the session established with the current request;
  • the SMF sends a query request to the subscription database, where the query request carries the slice identifier of the network slice that is used by the session currently established by the request;
  • the SSC mode obtained by querying the mapping relationship is the optional SSC mode, which is an SSC mode that is previously associated with the slice identifier.
  • the SMF may have multiple data interactions with the subscription database, and one or more mapping relationships may be stored in a storage medium such as a local cache during the interaction process, if the mapping relationship SMF needs to be queried this time. If the local storage is available, the local query can be directly performed, and the remote query can be performed by sending a query request to the subscription database, thereby reducing the amount of data interaction between the network elements and improving the query efficiency.
  • a storage medium such as a local cache during the interaction process
  • One of the selectable SSC modes is selected as the SSC mode corresponding to the terminal in step S120, and according to the SSC mode used this time.
  • the SSC mode selected in this way is adapted according to the network slice that the session will use, so that the SSC mode supported by the network slice used by the current session is selected, or the communication effect of the current session can be made better.
  • the SSC mode so that the selected SSC mode is in line with the communication requirements of the current communication scenario, to improve communication quality and user satisfaction.
  • the same terminal sends a session establishment request through different DNNs. If it uses different network slices, it may select different SSC modes according to the identifier of the network slice.
  • the terminal may also provide an SSC mode of its own choice, for example, by the session establishment request carrying the SSC mode provided by the terminal, the step S120 may include:
  • the step S110 may include:
  • the optional SSC mode of the session establishment request is obtained according to the slice identifier and the mapping relationship of the SSC mode.
  • the mapping relationship is a mapping relationship between the slice identifier, the DNN, and the SSC mode, and the optional SSC mode of the session establishment request is determined.
  • the step S110 may include:
  • a network slice may correspond to multiple DNNs, and different DNNs correspond to different communication resources in the network slice.
  • the DNN in order to select an SSC mode that is more suitable for the current session, the DNN is also acquired.
  • the DNN may be directly carried in the session establishment request, and may be directly sent by the terminal, or may be determined by the SMF according to the requested session type or the service corresponding to the session establishment request.
  • the mapping relationship is: a mapping relationship between the slice identifier, the DNN, and the SSC mode.
  • step S120 based on the slice ID of the network slice that the terminal requests the session to use, and the DNN to be used to jointly determine the optional SSC mode; and then select an SSC mode from the optional SSC mode to finally connect the user plane gateway. SSC mode.
  • the step S110 may include:
  • the step S110 may include: acquiring subscription data from a subscription database, wherein the subscription data includes the mapping relationship.
  • the subscription database is a database in which the subscription data is stored.
  • the subscription database may be a UDM database that uses a unified multi-dimensional model (UDM) for data storage.
  • UDM unified multi-dimensional model
  • the contract data is stored in the contract database.
  • the subscription data includes data describing the mapping relationship.
  • the mapping relationship can be as shown in Table 1:
  • the above table is a mapping relationship between slice identification, DNN and SSC mode.
  • the subscription data further includes a default SSC mode; the default SSC mode is one of the selectable SSC modes.
  • the contract data can be as shown in Table 2.
  • the selection priority of the default SSC mode in the selectable SSC mode may be higher than the non-default SSC mode other than the default SSC mode.
  • the default SSC mode is selected according to the selection priority, or the SSC mode is directly prioritized.
  • the method further includes:
  • the step S120 may include:
  • the used SSC mode is selected from the selectable SSC modes according to the SSC mode selection policy in the policy information.
  • the PCF may be a network element in which various policy information is stored in the communication network.
  • the PCF stores a flow control policy for flow control.
  • the SMF first receives policy information from the PCF, and before receiving the policy information from the PCF, sends a request for acquiring the policy information to the PCF, and then the SMF can receive the PCF based on the And acquiring the policy information returned by the request.
  • the selecting an SSC mode from the selectable SSC mode according to an SSC mode selection policy in the policy information includes at least one of the following:
  • the optional SSC mode includes the SSC mode selected by the terminal, selecting an SSC mode selected by the terminal as an used SSC mode;
  • selectable SSC mode does not include the SSC mode selected by the terminal, select a default SSC mode from the selectable SSC mode to use the SSC mode;
  • the default SSC mode is selected from the selectable SSC mode to be the used SSC mode.
  • the indication information of the SSC mode selected by the terminal may be carried in the session establishment request, so that after receiving the session establishment request, the SMF may determine, according to the session establishment request, the SSC mode selected by the terminal. .
  • the policy is selected based on the SSC mode. It is determined whether the optional SSC mode includes the SSC mode selected by the terminal. If the SSC mode selected by the terminal is included in the optional SSC mode, the SSC mode selected by the terminal is directly used as the final result of the SSC mode selection. If the optional SSC mode does not include the SSC mode selected by the terminal, the session establishment request may be directly rejected, for example, sending a session establishment failure message to the terminal.
  • the SSC mode in order to ensure the successful establishment of the session, if the SSC mode is selected in the SSC mode, the default SSC mode corresponding to the current network slice and/or DNN is selected as the final selection of the current SSC mode. As a result, the SSC pattern thus determined is also at least compatible with the network slice.
  • the SSC mode selection policy may be selected according to the SSC mode, and an SSC mode is randomly selected from the optional SSC mode as a final The result of the selection.
  • the SSC mode selection policy may be selected, and the SSC with the highest frequency of use may be selected from the optional SSC mode. The mode is the final selection result for the terminal to establish and tear down the connection with the user plane gateway based on the selected result.
  • the method further includes step S130; the step S130 may include at least one of the following:
  • the selected SSC mode is notified to the terminal.
  • the reason why the session establishment request is rejected in this implementation may include that the SSC mode selected by the terminal does not include a cause value in the network slice or the SSC mode supported or corresponding by the DNN.
  • the SMF also informs the terminal, so that the subsequent terminal establishes a connection with the user plane gateway according to the SSC mode, especially when the terminal switches the user plane gateway to which the terminal is connected. It can be performed according to the SSC mode.
  • the step S120 may further include:
  • one of the selectable SSC modes is selected as the used SSC mode.
  • the SSC mode provided by the terminal may be an SSC mode selected by the terminal, and the SSC mode provided by the terminal may be carried in the session establishment request.
  • the method further includes:
  • the SMF sends the selected SSC mode and the terminal identifier of the terminal to the user plane gateway, so that the user plane gateway establishes and tears down the connection with the terminal according to the received SSC mode. Therefore, in some embodiments, the SMF does not necessarily need to feed back the selected SSC mode to the terminal.
  • this embodiment provides a service continuity SSC mode selection method, which is applied to a subscription database, and includes:
  • Step S210 storing a mapping relationship between the slice identifier of the slice and the SSC mode
  • Step S220 Receive a query request of the session management function network element SMF.
  • Step S230 Query the mapping relationship to determine an optional SSC mode corresponding to the slice identifier carried in the query request.
  • Step S240 Returning an optional SSC mode of the query to the sending of the SMF; wherein the optional SSC mode is used by the SMF to select an SSC mode for use.
  • the SSC mode selection method provided in this embodiment is a method applied to a subscription database.
  • the subscription database pre-stores a mapping relationship between the slice identifier of each network slice and the SSC mode, and the description file or description data of the mapping relationship may be one type of subscription data stored in the subscription database.
  • the subscription database can be a UDM database.
  • the subscription database receives the query request sent by the SMF, and after receiving the query request, extracts at least the slice identifier from the query request, and queries the mapping relationship by using the slice identifier as a query basis, thereby determining
  • the slice identifies the corresponding SSC mode, and the SSC mode that is queried may be referred to as an optional SSC mode, and the optional SSC mode is returned to the SMF, so that the SMF selects the terminal and the user from the optional SSC mode.
  • the SSC mode is established by the gateway.
  • the step S210 may include:
  • the mapping relationship between the slice identifier, the data network name DNN, and the SSC mode is stored;
  • the query request also carries a data network name DNN, and/or the subscription database confirms the DNN corresponding to the slice identifier.
  • the DNNs of some network slices are unique and are known by the subscription database. Therefore, if the mapping relationship is a mapping relationship of three, the subscription database may determine the DNN by itself.
  • the step S230 may include:
  • mapping relationship Querying the mapping relationship to determine an optional SSC mode corresponding to the slice identifier and the DNN carried by the query request.
  • the subscription database substantially stores the mapping relationship between the slice identifier, the DNN, and the SSC mode.
  • the query request received in step S220 carries the DNN in addition to the slice identifier.
  • the subscription database queries the mapping relationship stored in the query according to the slice identifier and the DNN in the query request, thereby obtaining and The SSC mode corresponding to the slice identifier and the DNN in the query request is notified to the SMF as the optional SSC mode.
  • this embodiment provides a communication network element, where the communication network element is an SMF, including:
  • the obtaining unit 110 may be configured to acquire an optional SSC mode of the session establishment request according to the slice identifier of the network slice and the mapping relationship of the SSC mode;
  • the selection unit 120 is configurable to select the SSC mode to use from the selectable SSC mode.
  • the obtaining unit 110 may correspond to the communication interface of the SMF, and may receive a session establishment request sent by the terminal from other network elements, and locally query or remotely query the mapping relationship according to the session request, thereby obtaining an optional SSC mode. .
  • the selecting unit 120 may correspond to a processor, and the processor may select, by using a computer program, one of the selectable SSC modes as an SSC mode used by a terminal that currently requests to establish a session.
  • the SSC mode thus selected must be adapted to the network slice used by the session currently requested by the terminal, so that the SSC mode can be utilized to provide better communication quality and improve user satisfaction.
  • the SMF further includes:
  • the obtaining unit 110 is configured to obtain an optional SSC mode of the session establishment request according to the mapping relationship between the slice identifier, the data network name DNN, and the SSC mode; the determined SSC mode is respectively corresponding to the slice identifier and the DNN. SSC mode.
  • the obtaining unit 10 may include a communication interface, configured to receive a session request that is sent by the terminal and that carries the slice identifier of the network slice, and query the mapping relationship according to the slice identifier carried in the session request to obtain the session request.
  • a communication interface configured to receive a session request that is sent by the terminal and that carries the slice identifier of the network slice, and query the mapping relationship according to the slice identifier carried in the session request to obtain the session request.
  • the obtaining unit 110 may be further configured to send, to the subscription database, a query request that carries the slice identifier or carries the slice identifier and the DNN; and receives the subscription database based on the query request.
  • a query request that carries the slice identifier or carries the slice identifier and the DNN.
  • the SSC mode selected for the connection switching between the current terminal and the user plane gateway is not only adapted to the network slice but also to the DNN.
  • the obtaining unit 110 is configurable to obtain subscription data from a subscription database, wherein the subscription data includes the mapping relationship.
  • the selecting unit 120 may be specifically configured to select one of the selectable SSC modes as the used SSC mode according to the SSC mode provided by the terminal.
  • the subscription data in the subscription database includes a mapping relationship.
  • the SMF also includes:
  • the policy obtaining unit may correspond to a communication interface between the SMF and the PCF, and may be used to receive policy information from the PCF;
  • the selecting unit 120 may be configured to select an used SSC mode from the selectable SSC mode according to an SSC mode selection policy in the policy information.
  • the selection unit 120 can be configured to perform at least one of the following:
  • the optional SSC mode includes the SSC mode selected by the terminal, selecting an SSC mode selected by the terminal as an used SSC mode;
  • selectable SSC mode does not include the SSC mode selected by the terminal, select a default SSC mode from the selectable SSC mode to use the SSC mode;
  • the default SSC mode is selected from the selectable SSC mode to be the used SSC mode.
  • the selection unit 120 in the SMF combines the indication information indicating the SSC mode selected by the terminal in the session establishment request, and selects an SSC mode for the terminal to use in combination with the optional SSC mode.
  • the SMF also includes:
  • the first sending unit may be configured to: when the session establishment request is rejected, feed back to the terminal, the reason why the session establishment request is rejected; or, when responding to the session establishment request, notify the selected SSC mode Said terminal.
  • the first sending unit may be a communication interface that sends data to the terminal, and the reason or the notification that the session establishment request is rejected may be transited by other network elements, for example, the wireless network element is sent to the terminal.
  • the wireless network element may include: a base station or the like.
  • the selection unit 120 can be configured to select one of the selectable SSC modes as the used SSC mode according to the SSC mode provided by the terminal.
  • the embodiment provides a communication network element, where the communication network element is a subscription database, including:
  • the storage unit 210 is configured to store a mapping relationship between the slice identifier of the network slice and the SSC mode.
  • the receiving unit 220 is configured to receive a query request of the session management function network element SMF;
  • the querying unit 230 may be configured to query the mapping relationship to determine an optional SSC mode corresponding to the slice identifier carried by the query request.
  • the sending unit 240 is configured to return an optional SSC mode for sending the SMF to the query; wherein the optional SSC mode is used by the SMF to select an SSC mode for use.
  • the storage unit 210 may correspond to a storage medium, and the storage medium may be a random storage medium, a read-only storage medium, a flash memory, or a hard disk.
  • the storage medium may store various information, and the mapping relationship is stored.
  • the receiving unit 220 may correspond to a communication interface of the subscription database and the SMF connection, so that the query request sent by the SMF may be received.
  • the query unit 230 may correspond to the processor, may locally query the mapping relationship, and may determine an SSC mode corresponding to the slice identifier in the query request.
  • the sending unit 240 can also correspond to the communication interface, and can notify the SMF of the optional SSC mode of the query, facilitate the SMF to combine with the selected SSC mode of the terminal itself, or select a corresponding one according to the selection policy provided by the PCF.
  • the storage unit 210 is configured to store a mapping relationship between a slice identifier, a data network name DNN, and an SSC pattern; the query request further carries a data network name DNN, or the subscription database determines and The DNN corresponding to the slice identifier carried by the query request,
  • the query unit 230 may be configured to query the mapping relationship of the foregoing three to determine an optional SSC mode corresponding to the slice identifier and the DNN carried by the query request.
  • the embodiment provides a communication network element, including: a transceiver 310, a memory 320, a processor 330, and a computer program 340 stored on the memory 320 and executed by the processor 330;
  • the processor 330 is connected to the transceiver 310 and the memory 320, respectively, for implementing one or more of the foregoing SMF service continuity SSC mode selection methods by executing the computer program 340, or executing a subscription database.
  • One or more of the business continuity SSC mode selection methods are used.
  • the transceiver 310 of this embodiment may correspond to various types of interfaces, such as a network interface or a transceiver antenna.
  • the memory 320 can include devices that store various information.
  • the processor 330 may include a central processing unit, a microprocessor, a digital signal processor, an application processor, a programmable array or an application specific integrated circuit, etc., and may implement an optional SSC through execution of computer executable instructions such as a computer program.
  • the processor 330 can be coupled to the transceiver 310 and the memory 320 via a communication bus (e.g., an integrated circuit bus).
  • a communication bus e.g., an integrated circuit bus
  • the embodiment provides a computer storage medium storing a computer program, the computer program being executed, capable of one or more of the SMF business continuity SSC mode selection methods, or executing a contract database One or more of the business continuity SSC mode selection methods.
  • the computer storage medium may be: a removable storage device, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program code. Selected as a non-transitory storage medium or a non-volatile storage medium.
  • Figure 7 is a schematic diagram of a network architecture, including:
  • UE including: mobile phones, tablets or wearable devices.
  • a radio access network which may include a base station or the like, and may be used for the UE to access the network;
  • An authentication management function which can be used to perform authority and/or security authentication on the UE;
  • SMF the SMF described in FIG. 7 may include SMF1, SMF2;
  • a typical UPF may include: a user plane gateway, etc.; the UPF shown in FIG. 7 includes UPF1 and UPF2; the UPF is directly connected to the RAN; and the UPF is in the corresponding SMF. connection.
  • UPF User Plane Function
  • the DNN shown in Figure 7, has DN1 and DN2, which represent different DNNs, respectively.
  • the SSC mode selection method provided by this example can be applied to the network as shown in FIG. This example focuses on the selection of the SSC mode of the terminal during the establishment of the PDU session.
  • the information about the attributes of the network slice needs to be considered.
  • the SSC mode currently used by the terminal is selected according to the slice ID of the network slice.
  • the slice information, the DNN information, and the indication information of the SSC mode carried by the terminal are comprehensively considered;
  • the indication information of the SSC mode may be information indicating the SSC mode selected by the terminal. For example, the representation or serial number of the SSC mode selected by the terminal.
  • This example will clarify the SSC mode selection policy that the PCF configures for the SMF, which will also vary in different network slices.
  • the same terminal uses the session connection established by the same DNN, and different SSC modes can be adopted.
  • the selection of the SSC mode is that the SMF comprehensively considers the SSC mode provided by the terminal, the SSC mode of the DNN subscription in the network slice provided by the UDM, and makes a comprehensive judgment, thereby selecting an appropriate SSC mode.
  • the SSC mode selection method provided in this example may specifically include:
  • the terminal triggers the establishment of a PDU session.
  • the information obtained by the SMF includes: a slice identifier (S-NSSAI), a DNN, and an SSC mode selected by the terminal.
  • the SMF goes to the UDM to obtain the SSC mode corresponding to the DNN in the network slice.
  • the UDM uses the S-NSSAI and DNN as indexes to find the SSC mode of the DNN subscription in the network slice.
  • the SMF comprehensively considers the SSC mode provided by the terminal and the SSC mode provided by the UDM, and selects an appropriate SSC mode based on the SSC mode selection policy, and informs the UE.
  • the SMF obtains the default SSC mode corresponding to the DNN in the slice from the UDM, and notifies the UE.
  • This example provides an SSC mode selection method, which may include:
  • the SMF goes to the PCF to obtain policy information, and the acquired policy information may include an SSC mode selection policy.
  • the SSC mode selection strategy specifically includes:
  • the selection of the SSC mode may be as follows:
  • the SDM mode list of the DNN subscription provided by the UDM does not include the SSC mode provided by the terminal, and the SMF rejects the establishment of the PDU session and feeds back the cause value.
  • This list reflects the correspondence between network slices, DNN, and SSC modes.
  • the SDM mode list of the DNN subscription provided by the UDM does not include the SSC mode provided by the terminal, and the SMF selects the default SSC mode to establish a session, and feeds back the default SSC mode to the terminal.
  • the SDM mode list of the DNN subscription under the network slice provided by the UDM includes the SSC mode provided by the terminal, and the SMF establishes the session by using the SSC mode.
  • the selection of the SSC mode may be as follows:
  • the UDM provides the SSC mode list for this DNN subscription under this slice, and the SMF selects the default SSC mode in the list to establish the session.
  • the supported SSC mode list and the default SSC mode are stored per network slice per DNN.
  • the SMF obtains subscription information from the UDM, including a list of SSC patterns under a DNN of a slice and a default SSC mode.
  • the PCF configures the SSC mode selection policy to the SMF. If the UE provides an SSC mode during the request to establish a new PDU session, the SMF relies on the SSC mode selection policy configured by the PCF, selects the SSC mode requested by the UE, or modifies the requested SSC mode.
  • this example provides another method for selecting a business continuity mode, including:
  • the terminal initiates a session establishment request for establishing a PDU session to the Radio Access Network (RAN) and the AFM.
  • the session establishment request carries information of the S-NSSAI (slice ID information) provided by the terminal, the DNN, and the SSC mode provided by the terminal.
  • the AMF passes the information requested by the terminal to establish a PDU session to the SMF.
  • SMF goes to UDM to get the contract information. Including: the SMF goes to the UDM to obtain the SSC mode corresponding to the DNN in the network slice.
  • the UDM uses the S-NSSAI and DNN as indexes to find the SSC mode of the DNN contract in the slice.
  • the SMF goes to the PCF to obtain policy information, which may include an SSC mode selection policy.
  • policy information which may include an SSC mode selection policy.
  • the SMF comprehensively considers the SSC mode provided by the terminal and the SSC mode provided by the UDM, and selects an appropriate SSC mode for the PDU session based on the SSC mode selection policy. If the SSC mode list of the DNN subscription is not included in the network slice provided by the UDM, and the SSC mode provided by the terminal is not included, the SMF rejects the establishment of the PDU session and feeds back the cause value.
  • the SMF informs the AMF of the SSC mode of the PDU.
  • the AMF informs the RAN of the SSC mode information.
  • the RAN informs the UE of the SSC mode.
  • the example provides a method for selecting an SSC mode, which may include:
  • the terminal initiates a session establishment request for establishing a PDU session to a Radio Access Network (RAN) and an Authentication Management Function (AMF).
  • the session establishment request carries information of the S-NSSAI (slice ID information) provided by the terminal, the DNN, and the SSC mode provided by the terminal.
  • the AMF passes the information requested by the terminal to establish a PDU session to the SMF.
  • SMF goes to UDM to get the contract information. Including: the SMF goes to the UDM to obtain the SSC mode corresponding to the DNN in the network slice.
  • the UDM uses the S-NSSAI and DNN as indexes to find the SSC mode of the DNN contract in the slice.
  • the SMF goes to the PCF to obtain policy information, which may include an SSC mode selection policy.
  • the SMF comprehensively considers the SSC mode provided by the terminal and the SSC mode provided by the UDM, and selects an appropriate SSC mode for the PDU session based on the SSC mode selection policy. If the SVC mode list of the DNN subscription provided by the UDM does not include the SSC mode provided by the terminal, the SMF rejects the establishment of the PDU session and feeds back the reason value to the terminal.
  • SMF selects the appropriate User Plane Function (UPF).
  • UPF User Plane Function
  • the SMF informs the AMF of the SSC mode of the PDU.
  • the AMF informs the RAN of the SSC mode information.
  • the SMF will reject the information established by the PDU session to the terminal, including the reason value of the feedback.
  • the supported SSC mode list and the default SSC mode are stored per slice per DNN.
  • the SMF obtains the subscription information from the UDM, including the SSC mode list and the default SSC mode under a certain DNN of the slice; during the UE requesting to establish the PDU session, the PCF configures the SSC mode selection policy to the SMF. If the UE provides an SSC mode during the request to establish a new PDU session, the SMF relies on the SSC mode selection policy configured by the PCF, selects the SSC mode requested by the UE, or modifies the requested SSC mode.
  • the SSC mode selection strategy can include:
  • the SVC mode list of the DNN subscription provided by the UDM does not include the SSC mode provided by the terminal, and the SMF rejects the establishment of the PDU session, and feeds back the reason value.
  • the SDM mode list of the DNN contracted by the UDM does not include the SSC mode provided by the terminal, and the SMF selects the default SSC mode to establish a session and feeds back the default SSC mode.
  • the SDM mode list of the DNN subscription provided by the UDM includes the SSC mode provided by the terminal, and the SMF establishes the session by using the SSC mode.
  • the UDM When the session establishment request does not carry the SSC mode provided by the terminal, the UDM provides the SSC mode list of the DNN subscription, and the SMF selects the default SSC mode in the list to establish the session.
  • the disclosed 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 such as: multiple units or components may be combined, or Can be integrated into another system, or some features can be ignored or not executed.
  • the coupling, or direct coupling, or communication connection of the components shown or discussed may be indirect coupling or communication connection through some interfaces, devices or units, and may be electrical, mechanical or other forms. of.
  • the units described above as separate components may or may not be physically separated, and the components displayed as the unit may or may not be physical units, that is, may be located in one place or distributed to multiple network units; 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 application may be integrated into one processing module, or each unit may be separately used as one unit, or two or more units may be integrated into one unit;
  • the unit can be implemented in the form of hardware or in the form of hardware plus software functional units.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

Des modes de réalisation de la présente invention concernent un procédé de sélection d'un mode de continuité de service et de session (SSC), un élément de réseau de communication et un support de stockage. Le procédé de sélection d'un mode SSC est appliqué dans une fonction de gestion de session (SMF), et comprend les étapes consistant à : obtenir un mode SSC disponible pour une demande d'établissement de session selon une relation de mappage entre un identifiant de tranche d'une tranche de réseau et un mode SSC; et sélectionner un mode SSC pour une utilisation à partir du mode SSC disponible.
PCT/CN2018/103338 2017-11-10 2018-08-30 Procédé de sélection de service et de mode de continuité de session, élément de réseau de communication et support de stockage WO2019091195A1 (fr)

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