WO2018161803A1 - Method and device for selecting network slices - Google Patents

Method and device for selecting network slices Download PDF

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Publication number
WO2018161803A1
WO2018161803A1 PCT/CN2018/077010 CN2018077010W WO2018161803A1 WO 2018161803 A1 WO2018161803 A1 WO 2018161803A1 CN 2018077010 W CN2018077010 W CN 2018077010W WO 2018161803 A1 WO2018161803 A1 WO 2018161803A1
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Prior art keywords
slice
information
network
network slice
nssai
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PCT/CN2018/077010
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French (fr)
Chinese (zh)
Inventor
武绍芸
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华为技术有限公司
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Priority to CN201710137404.9A priority Critical patent/CN106982458B/en
Priority to CN201710137404.9 priority
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2018161803A1 publication Critical patent/WO2018161803A1/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/02Access restriction performed under specific conditions
    • H04W48/06Access restriction performed under specific conditions based on traffic conditions
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/18Selecting a network or a communication service

Abstract

Disclosed are a method and device for selecting network slices for solving the problem in the prior art of not being able to guarantee a user the same experience in a visit network as in the home network. The method comprises: a first SSF of a VPLMN receives a slice selection request, the slice selection request being used for requesting the first SSF to select a network slice for a roaming terminal device, and the slice selection request comprising information of conditions which the requested network slice is required to satisfy; the first SSF sends the information of conditions to a second SSF of a HPLMN; the first SSF receives the slice information, sent by the second SSF, of the first network slice satisfying the information of the conditions; the first SSF selects a second network slice for the terminal device on the basis of the slice information of the first network slice.

Description

 The invention relates to a method and a device for selecting a network slice. The application is filed on March 9, 2017, the Chinese Patent Office, the application number is 201710137404. 9. The invention is entitled "A Method and Apparatus for Selecting a Network Slice" Priority is hereby incorporated by reference in its entirety. Technical field

 The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for selecting a network slice. Background technique

 The fifth generation mobile communication technology (5G) system proposes a network slicing concept. A network slice satisfies the connection communication service requirements of a certain class or a use case. The entire 5G system is composed of a large number of network slices satisfying different connection capabilities. The network slice is end-to-end, including the radio access network, the core network, and the transmission network. In addition, the radio access network, the core network, and the transmission network are all sliced, so that the network slices of multiple parts are connected together. An overall network slice that provides users with a complete service. Different parts of the network slices are logically isolated.

 The selection of the network slice that the user equipment faces when attaching or requesting a service after the 5G network is sliced. Currently, when performing network slice selection, an independent logical network element slice selection function entity (English: Slice Selection Function, SSF) is generally added on the network side, which is responsible for selecting a network slice accessible by the UE for the UE. The RAN Node requests the SSF to allocate a network slice to the UE based on the request of the UE, so that the SSF selects a network slice for the UE after receiving the request of the UE.

 Under the same public land mobile network (English: Public Land Mobile Network, PLMN), the user equipment (English: User Equipment, UE: UE) can access only one network slice or multiple network slices. , using multiple services provided by multiple network slices at the same time.

There are two scenarios for the UE roaming access network: home routed roaming and local breakout roaming. In the home route roaming scenario, when the UE roams to visit the public land mobile network (English: Visit Public Land Mobile Network, VDLMN), the SSF of the visited place and the SSF of the home place are respectively based on the subscriptions of the respective acquired users. Information and policy information, etc., select a network slice for the user, and establish a user plane tunnel between the two network slices, and the subsequent services of the user are forwarded to the home network slice processing. In the local grooming roaming scenario, when the UE roams to visit the public land mobile network (English: Visit Public Land Mobile Network, called: VPLMN), the SSF of the visited place selects the network slice for the user, so the network slice of the visited place is The user provides the service and no longer needs to forward the service to the home network for processing. However, the planning of the subscription information and the policy information of the user may be inconsistent, and the SSF of the visited place and the SSF of the home location may not be consistent with the service quality of the network slice selected by the user, thereby failing to ensure that the user is visiting the place. Get the same user experience as at the home. Summary of the invention The present application provides a method and an apparatus for selecting a network slice to solve the problem that the prior art cannot ensure that the user obtains the same experience as the home location at the visited place.

 In a first aspect, an embodiment of the present application provides a method for selecting a network slice, including:

 The first slice selection function SSF device accessing the public land mobile network VPLMN receives a slice selection request, and the slice selection request is used to request the first SSF to select a network slice for the roaming terminal device, where the slice selection request includes Condition information that the requested network slice should satisfy; the first SSF sends the condition information to a second SSF of the home public land mobile network HPLMN of the terminal device; the first SSF receives the second SSF transmission The slice information of the first network slice that satisfies the condition information in the HPLMN; the first SSF selects a second network slice for the terminal device based on the slice information of the first network slice.

 In the above solution, when the SSF of the visited location performs the slice selection for the terminal device, the SSF of the home location is preferentially selected to select the network slice for the terminal device, and then the visited SSF selects a suitable network slice for the terminal device according to the selection result of the home location. It ensures that the roaming user can get a reasonable slice selection experience at the visited place, so that the roaming user gets the same user experience at the place of the visit.

 In one possible design, the condition information includes at least one of the following information:

 The identification information of the terminal device, the user information of the terminal device, the service type, and the user-signed service quality QoS information.

 Through the above design, the foregoing information is included in the condition information and sent to the SSF of the home location, thereby providing a good basis for the home SSF to select the network slice.

 In a possible design, the slice information includes first session management network slice selection auxiliary information SM-NSSAI corresponding to the first network slice and/or QoS information satisfied by the first network slice.

 Through the above design, the SF information that is satisfied by the first session management slice selection assistance information SM-NSSAI and/or the first network slice corresponding to the selected first network slice is transmitted to the SSF of the visited place by the SSF of the home network, thereby The SSF of the visited place provides a basis for the SSF to select the network slice at the home location, and ensures that the roaming user can perform reasonable slice selection at the visited place, thereby obtaining a service experience consistent with the attribution.

 In a possible design, when the slice information includes the first SM-NSSAI, the first SSF selects a second network slice for the terminal device based on the slice information of the first network slice, including :

 The first SSF determines, according to the pre-configured SM-NSSAI mapping relationship, a second SM-NSSAI corresponding to the first SM-NSSAI, and the second SM-NSSAI belongs to the second network slice.

 With the above design, the SM-NSSAI mapping relationship is configured on the first SSF of the home location, so that the visited SSF selects the network slice for the roaming user based on the SM-NSSAI mapping relationship, and the SM-NSSAI corresponding to the mapping relationship corresponds to the two network slices. The service experience obtained by the user is consistent, thereby ensuring that the roaming user can perform reasonable slice selection at the visited place, thereby obtaining a service experience consistent with the attribution.

 In a possible design, the method further includes:

 When the first SSF determines that the SM-NSSAI corresponding to the first SM-NSSAI does not exist in the SM-NSSAI mapping relationship, the third network slice is selected for the terminal device.

 Through the above design, a possible implementation manner is provided for the case where the network slice cannot be selected based on the SM-NSSAI mapping relationship.

In a possible design, when the slice information further includes QoS information that is satisfied by the first network slice, The method also includes:

 When the first SSF determines that the SM-NSSAI corresponding to the first SM-NSSAI does not exist in the SM-NSSAI mapping relationship, the first SSF selects in the VPLMN to satisfy that the first network slice satisfies The second network slice of QoS information.

 Through the above design, in the case that the network slice cannot be selected based on the SM-NSSAI mapping relationship, the network slice is selected according to the QoS information, so that the network slice selected at the visited location and the network slice selected at the home location can satisfy the same QOS requirement of the user, Therefore, it is ensured that the roaming user can make a reasonable slice selection at the visited place, thereby obtaining a service experience consistent with the attribution.

 In a possible design, when the slice information includes the QoS information that is satisfied by the first network slice, the first SSF selects the second device for the terminal device based on the slice information of the first network slice. The network slice includes: the first SSF selecting a second network slice that satisfies QoS information that is satisfied by the first network slice.

 Through the above design, the network slice is selected in a visited manner according to the QoS information of the network slice selected at the home, so that the network slice selected at the visited and the network slice selected at the home can satisfy the same QoS requirement of the user, thereby ensuring roaming. The user can make a reasonable slice selection at the visited place, thereby obtaining a business experience consistent with the attribution.

 In a possible design, the method further includes:

 When the first SSF determines that the QoS information that is satisfied by the first network slice is not met, the first SSF sends feedback information to the slice management system, where the feedback information is used to notify the administrator that the network does not meet the service requirements of the terminal device. slice.

 With the above design, after receiving the above feedback information, the administrator can plan a network slice, or the slice management system automatically generates a network slice according to the pre-configured policy. The feedback information may include identification information of the terminal device, identifier information of the VPLMN, identifier of the HPLMN, SM-NSSAI of the home location, and QoS information.

 In a second aspect, the embodiment of the present application provides a method for selecting a network slice, including:

 The second slice selection function entity SSF of the home public land mobile network HPLMN receives condition information transmitted by the first SSF of the VPLMN that visited the public land mobile network and used to select a network slice for the roaming terminal device; the second SSF selection a first network slice that satisfies the condition information, and sends the slice information of the first network slice to the first SSF, so that the first SSF is based on the slice information of the first network slice. The terminal device selects the second network slice.

 In the above solution, when the SSF of the visited location performs the slice selection for the terminal device, the SSF of the home location is preferentially selected to select the network slice for the terminal device, and then the visited SSF selects a suitable network slice for the terminal device according to the selection result of the home location. It ensures that the roaming user can get a reasonable slice selection experience at the visited place, so that the roaming user gets the same user experience at the place of the visit.

 In one possible design, the condition information includes at least one of the following information:

 The identification information of the terminal device, the user information of the terminal device, the service type, and the user-signed service quality QoS information.

 Based on the same inventive concept as the method embodiment, the third aspect of the present disclosure provides a device for selecting a network slice, including:

a receiving unit, configured to receive a slice selection request, where the slice selection request is used to request a terminal device for roaming Selecting a network slice, the slice selection request includes condition information that the requested network slice should satisfy; a sending unit, configured to send the condition information to a second SSF of the home public land mobile network HPLMN of the terminal device;

 The receiving unit is further configured to receive, by the HPLMN, slice information of a first network slice that satisfies the condition information in the HPLMN;

 And a selecting unit, configured to select, according to the slice information of the first network slice, a second network slice for the terminal device. In one possible design, the condition information includes at least one of the following information:

 The identification information of the terminal device, the user information of the terminal device, the service type, and the user-signed service quality QoS information.

 In a possible design, the slice information includes first session management slice selection assistance information SM-NSSAI corresponding to the first network slice and/or QoS information satisfied by the first network slice.

 In a possible design, when the slice information includes the first SM-NSSAI, the selecting unit is specifically configured to determine, according to the pre-configured SM-NSSAI mapping relationship, the first SM-NSSAI corresponding The second SM-NSSAI, the second SM-NSSAI belongs to the second network slice.

 In a possible design, the selecting unit is further configured to: when the SM-NSSAI corresponding to the first SM-NSSAI does not exist in the SM-NSSAI mapping relationship, select a third network for the terminal device. slice.

 In a possible design, when the slice information further includes QoS information that is satisfied by the first network slice, the selecting unit is further configured to determine that the first SM does not exist in the SM-NSSAI mapping relationship. - When the SM-NSSAI corresponding to the NSSAI, the second network slice that satisfies the QoS information satisfied by the first network slice is selected.

 In a possible design, when the slice information includes the QoS information that is satisfied by the first network slice, the selecting unit is further configured to select, to meet the QoS information that is satisfied by the first network slice. Two network slices.

 In a possible design, the sending unit is further configured to: when determining that the QoS information that is satisfied by the first network slice is not met, send feedback information to the slice management system, where the feedback information is used to notify the administrator There is no network slice that satisfies the service requirements of the terminal device.

 In a fourth aspect, the embodiment of the present application provides a device for selecting a network slice, including:

 a receiving unit, configured to receive condition information that is sent by a VPLMN that visits the public land mobile network and is used to select a network slice for the roaming terminal device;

 a selecting unit, configured to select a first network slice that satisfies the condition information;

 a sending unit, configured to send, to the first SSF, slice information of the first network slice selected by the selecting unit, so that the VPLMN selects the terminal device based on slice information of the first network slice The second network slice.

 In one possible design, the condition information includes at least one of the following information:

 The identification information of the terminal device, the user information of the terminal device, the service type, and the user-signed service quality QoS information.

 Based on the same inventive concept as the method embodiment, the fifth aspect of the present application further provides a network slice selection device, where the device includes:

 Communication interface, processor and memory.

The memory is used to store program code executed by the processor. The processor transmits and receives data through a communication interface, specifically for executing program code stored in the memory, and implements the method described in any one of the first aspect or the first aspect.

 Based on the same inventive concept as the method embodiment, in a sixth aspect, the embodiment of the present application further provides a network slice selection device, where the device includes:

 Communication interface, processor and memory.

 The memory is used to store program code executed by the processor.

 The processor transmits and receives data through a communication interface, specifically for executing program code stored in the memory, and implements the method described in any one of the second aspect or the second aspect.

 In a seventh aspect, the embodiment of the present application further provides a computer storage medium, where the software program stores a software program, where the software program can implement the first aspect or the first one when being read and executed by one or more processors. A method provided by any one of the aspects, or a method provided by any one of the second aspect or the second aspect. DRAWINGS

 1 is a schematic diagram of slice management performed by a slice management system according to an embodiment of the present application;

 2 is a schematic diagram of a 5G network architecture provided by an embodiment of the present application;

 FIG. 3 is a flowchart of a method for selecting a network slice according to an embodiment of the present application;

 4 is a schematic diagram of a SM-NSSAI mapping relationship provided by an embodiment of the present application;

 FIG. 5 is a schematic diagram of a method for selecting a network slice according to an embodiment of the present application;

 FIG. 6 is a schematic diagram of a device for selecting a network slice of a first SSF applied to a VPLMN according to an embodiment of the present application;

 FIG. 7 is a schematic diagram of another apparatus for selecting a network slice of a first SSF applied to a VPLMN according to an embodiment of the present disclosure;

 FIG. 8 is a schematic diagram of a device for selecting a network slice of a second SSF applied to an HPLMN according to an embodiment of the present application;

 FIG. 9 is a schematic diagram of another apparatus for selecting a network slice of a second SSF applied to an HPLMN according to an embodiment of the present application. detailed description

Network slicing, ie "5G slicing", supports a specific connection type of communication service, and provides a control plane for this service (English: Control Plane, cartridge: CP) and user plane (English: User Plane, cartridge: UP ) specific processing methods. In order to achieve this goal, the mobile operator implements the configuration and management of hundreds of network slices through a series of network function configuration and scheduling on the control platform of the core network (English: core network, cartridge: CN), in order to support Specific use cases or business models. Network slicing can involve a series of configuration and support of network elements between end-to-end, including user equipment (English: user equipment, UE: UE), access network (English: radio access network, cartridge: RAN) And other equipment. Network slicing can be used to support specific applications and business models, providing only the necessary business processing, avoiding all other unnecessary functions, reducing the complexity and shortening the time to market; network slicing allows third parties to do a certain degree of network slicing. Control, increase flexibility, reduce operator workload; network slice in addition to package Including network slicing on resources, it also provides general management methods for network and network elements based on slicing resources, such as deployment, expansion, and software upgrade. When the number of slices is large, the maintenance cost of the operator will increase. In order to reduce maintenance costs, the lifecycle management process such as network deployment, expansion, and upgrade can be improved. In addition, network slicing shares the same with traditional mobile virtual network operators (English: mobile virtual network operator, MVNO) The way of the network is different. The network slice uses the virtualization technology to realize the isolation between different slices from the resources, and then virtualizes different networks according to the diversified requirements.

 Network slicing will enable the isolation of network quality of service (English: Quality of Service, QoS), flexible network management and network efficiency, network managers will be able to decompose according to end-to-end QoS requirements, mapping to different The sub-network system and the forwarding device simultaneously establish a network slice in a low-cost, high-rate manner, and do not affect existing services. Network slicing can provide a partially flexible and programmable interface to third-party users, enabling third-party users to design and develop trusted network services based on open interfaces and achieve rapid deployment, bringing considerable economic benefits to operators while improving The efficiency of the use of existing networks.

 As shown in Figure 1, the network administrator can manage the network slice of the network through the slice management system, including creating and revoking operations. After a network slice is divided according to functions, it can include RAN slices, core mesh slices, and transport slices. Compared with the current 4G network, the capability of the RAN slice is equivalent to one or more access network nodes (English: eNode, nickname: eNB), and the core network slice capability is equivalent (English: Mobility Management Entity, cartridge: MME Control plane of service gateway (English: Serving Gate Way, cylinder: SGW), control plane of packet data network gateway (English: Packet Data Network Gateway, cylinder: PGW), policy and charging rules function unit : Policy and Charging Rules Function, cartridge: PCRF), Home Subscriber Server (English: Home Subscriber Server, HSS). A transport slice is equivalent to a route-forwarding device such as a router that connects other devices. The solution provided by the embodiment of the present application is mainly for selecting a network slice on the core network.

 As shown in Figure 2, it is a schematic diagram of a possible 5G network architecture. In Figure 2, the core network can be divided into multiple network slices, and each network slice contains a set of network functions with specific functions (English: network function, nickname: NF). In addition, the functions of the core network mainly include CP and UP. The functions of the CP can be divided into common CP functions (Common CP NFs, cylinder: CCNF) and specific CP functions (CP NFs). „Common CP functions include mobile management (English: Mobile Management, MM), authentication (authentication) ), etc., through access management and mobility management (Access and mobility management, AMF) and SSF. Specific CP functions include session management (English: Session Management, cartridge: SM), etc. Public CP NFs can be One or more network slices are used together, for example, in Figure 2, network slice A and network slice B use a common CP NFs in common. The RAN is connected to the SSF and each network slice. After the terminal device accesses the RAN, it selects the appropriate one through the SSF. Network slicing, thus accessing the data network, providing customized services through CP NFs and UP NFs and parameter configuration, thereby forming an end-to-end network slicing architecture in 5G. When SSF selects network slicing for the terminal device, The user information of the terminal device stored based on the Subscriber Repository is Said network terminal device selected slice.

In the 5G network environment, when the user's terminal equipment roams from the home network HPLMN to the visited network VPLMN, the SSF of the VPLMN needs to select the network slice for the terminal device. At present, 5G services are becoming more and more abundant, and there are a lot of high-bandwidth, low-latency extreme experience appeals. In addition, under the 5G network architecture, in order to achieve the same user experience at the visited place and at the place of attribution, in addition to a reasonable allocation In addition to the QoS parameters, you also need to A reasonable choice, the traditional network roaming is roaming from one network to another, and there is no other network choice, but now in the 5G network environment, it is a network slicing to multiple network slices roaming, There is a more choice.

 Therefore, in order to achieve the same user experience that the user obtains the same user experience at the visited place, the embodiment of the present application provides a method and a device for selecting a network slice. When the SSF of the visited place selects a slice for the terminal device, priority is given to the attribution. The SSF of the ground selects a network slice for the terminal device, and then the SSF of the visited place selects a suitable network slice for the terminal device according to the selection result of the attribution place, thereby ensuring that the roaming user can obtain a reasonable slice selection experience at the visited place, thereby enabling roaming The user gets the same user experience at the place of attribution as the home location. The method and the device are based on the same inventive concept. Since the principles of the method and the device for solving the problem are similar, the implementation of the device and the method can be referred to each other, and the repeated description is not repeated.

 In addition, when performing network slice selection, the embodiment of the present application may be applicable to selection of a common CP NFs part in different network slices, and may also be applicable to selection of specific CP NFs parts in different network slices, or may also be applicable to The selection of the common CP NFs portion and the selection of the specific CP NFs portion are not specifically limited in this embodiment of the present application.

 In this embodiment, the terminal device may be a wireless terminal, for example, a mobile phone, a computer, a tablet, a personal digital assistant (English: personal digital assistant, PDA), and a mobile Internet device (English: mobile Internet device) , Abbreviation: MID), Internet Protocol (English: Internet Protocol, abbreviation: IP) Telephone, network printer and e-book reader (English: e-book reader), car device, wearable device, IoT terminal device, such as fire Detection sensors, smart water meters/meters, smart bicycles, drones, factory monitoring equipment, and more.

 The embodiments of the present application can be applied to a mobile communication system such as a 5G communication system or a long term evolution (English: long term evolution, LTE) system.

 The session management network slice selection assistance information (English: Session Management - Network Slice Selection Assistance Information, SM-NSSAI), which is referred to in the embodiment of the present application, is information for network slice selection. The network slice selection auxiliary information includes network slice information/service type (English: Slice/Service type, cartridge: SST) and/or slice separator (English: Slice Differentiator, cartridge: SD). SST refers to the expected network behavior in terms of performance and service. The SD information is used to supplement the SST information, allowing further differentiation of network slice instances selected from multiple network slice instances, all of which satisfy the indicated slice/service type information.

 In the description of the embodiments of the present application, plural means two or more. And / or ", describe the association relationship of the associated object, indicating that there can be three kinds of relationships, for example, A and / or B, can represent: There are three cases of A, B and A and B, respectively. / "Generally indicates that the contextual object is an "or" relationship.

 In addition, it should be understood that in the description of the embodiments of the present application, the terms "first", "second" and the like are used only to distinguish the purpose of description, and are not to be understood as indicating or implying relative importance, nor understanding. Indicated or implied order.

 Based on the foregoing description, as shown in FIG. 3, a flow chart of a method for selecting a network slice according to an embodiment of the present application is shown.

 Referring to Figure 3, the method includes:

S301. The first slice selection function SSF device that accesses the public land mobile network VPLMN receives a slice selection request, where the slice selection request is used to request the first SSF to select a network slice for the roaming terminal device, where the slice The selection request includes condition information that the requested network slice should satisfy.

 In the embodiment of the present application, the first SSF device receives the slice selection request, which may be triggered when the terminal device accesses the VPLMN, initiates an attach, or may trigger when a tracking area update (TAU) is triggered.

 The condition information includes at least one of the following information:

 The identification information of the terminal device, the user information of the terminal device, the service type, and the quality of service (English: quality of service, QoS) information.

 S302: The first SSF sends the condition information to a second of the home public land mobile network HPLMN.

SSF.

 After the second SSF receives the condition information, the second SSF selects a first network slice that satisfies the condition information, and sends the slice information of the first network slice to the first SSF.

 S304: The first SSF receives the slice information of the first network slice that is sent by the second SSF that meets the condition information.

 S305. The first SSF selects a second network slice for the terminal device based on the slice information of the first network slice.

 Specifically, the first SSF selects a second network slice for the roaming terminal device in the VPLMN in which the first network slice is based on the slice information of the first network slice.

 In a possible implementation manner, the first SSF of the visited place and the second SSF of the home location perform network slice selection by using the SM-NSSAI.

 There is a definition of SM-NSSAI in each PLMN.

 SM-NSSAI includes a variety of network slices that satisfy different business services.

For example, the operator plans two network slices on the home network for two different QoS services, using two different SM-NSSAIs as the identifiers. As shown in Table 1, it is defined as SM-NSSAI in the home network HPLMN.

Figure imgf000010_0001

Figure imgf000010_0002
The network slice corresponding to the SM-NSSAI=1 is a network slice HA for the low service service, and the planned bandwidth limit is 10 Mbps, and the planned delay is 100 ms. The network slice corresponding to SM-NSSAI=2 is the network slice HA for high-service services, which satisfies the planned bandwidth limit of IGbps and the planned delay of 10ms.

For example, the operator plans three network slices on the visited network for three different QoS services, using three different SM-NSSAIs as the identifiers, as shown in Table 2, for the SM-NSSAI definition of the visited network VPLMN. . Table 2

Figure imgf000011_0001
The network slice corresponding to SM-NSSAI=100 is a network slice VA for low service service, which satisfies the planned bandwidth limit of 15 Mbps, and the planned delay is 200 ms. The network slice corresponding to SM-NSSAI=200 is a network slice VB for high-service services, which satisfies the planned bandwidth limit of 900 Mbps and the planned delay of 15 ms. The network slice corresponding to SM-NSSAI=300 is a network slice VC for other service services, which satisfies the planned bandwidth limit of 10 Mbps, and the planned delay is 500 ms.

 After the second SSF receives the condition information, the second SSF selects a first network slice that satisfies the condition information, and sends the slice information of the first network slice to the first SSF. The slice information may include first slice selection assistance information SM-NSSAI corresponding to the first network slice and/or QoS information that is satisfied by the first network slice.

 In an application scenario, the slice information includes the first SM-NSSAI, that is, the second SSF determines that the first network slice is satisfied according to the condition information, and determines according to the definition of the network slice in the SM-NSSAI. The SM-NSSAI of the first network slice, thereby transmitting the SM-NSSAI of the first network slice to the first SSF. Then, in step S305, the first SSF selects a second network slice for the terminal device based on the slice information of the first network slice, which can be implemented as follows:

 The first SSF determines, according to the pre-configured SM-NSSAI mapping relationship, a second SM-NSSAI corresponding to the first SM-NSSAI, and the second SM-NSSAI belongs to the second network slice.

 The above SM-NSSAI mapping relationship may be pre-configured in the home location and the visited SSF. Take Table 1 and Table 2 as examples. The SM-NSSAI mapping relationship, as shown in Figure 4 and Table 3, can be: Table 3

Figure imgf000011_0002
Where SM-NSSAI-H represents the SM-NSSAI of the home HPLMN, SM-NSSAI-V represents the SM-NSSAL of the visited VPLMN The mapping between the SM-NSSAI of the HPLMN and the SM-NSSAI of the VPLMN is used to select the SM-NSSAI-V through the SM-NSSAI-H. The SM-NSSAI mapping relationship can be configured on the SSF of the VPLMN and HPLMN.

 Specifically, during the network planning, the VAMMN and the HPLMN may sign a roaming agreement, and according to the QOS plan of each PLMN, map the SM-NSSAI of the VPLMN and the HPLMN to obtain an SM-NSSAI mapping relationship, and then configure the VPLMN and the HPLMN respectively. On the SSF.

 In addition to the exact mapping, you can also configure the default SM-NSSAI-V, which can be used as the default when other rules cannot be matched. For example, when SM-NSSAI-H is neither 1 nor 2, SM-NSSAI-V uses 300.

 Specifically, when the first SSF determines that the SM-NSSAI corresponding to the first SM-NSSAI does not exist in the SM-NSSAI mapping relationship, the third network slice is selected for the terminal device.

 In another application scenario, when the slice information includes the first SM-NSSAI of the first network slice, the QoS information that is satisfied by the first network slice may also be included. That is, after the second SSF determines that the first network slice is satisfied according to the condition information, the SM-NSSAI of the first network slice is determined according to the definition of the network slice in the SM-NSSAI, and the QoS information satisfied by the first network slice is determined. Thereby, the SM-NSSAI of the first network slice and the QoS information are sent to the first SSF.

 When the first SSF determines that the SM-NSSAI corresponding to the first SM-NSSAI does not exist in the SM-NSSAI mapping relationship, the first SSF selects to satisfy the first network slice in the VPLMN. A second network slice of the QoS information that is satisfied.

 In still another application scenario, the slice information includes QoS information that is satisfied by the first network slice. That is, after determining that the first network slice is satisfied, the second SSF determines, according to the condition information, the QoS information that is satisfied by the first network slice. Thereby, the QoS information of the first network slice is sent to the first SSF. Therefore, when the first SSF selects the second network slice for the terminal device in the VPLMN based on the slice information of the first network slice, the first SSF may be implemented as follows:

 The first SSF selects, in the VPLMN, a second network slice that satisfies QoS information satisfied by the first network slice.

 In a possible implementation manner, when determining that the network slice in the VPLMN does not satisfy the QoS information that is satisfied by the first network slice, the first SSF determines that the first network slice is not satisfied. When the QoS information is satisfied, the feedback information may be sent to the slice management system, where the feedback information is used to notify the administrator that the network slice in the VPLMN cannot meet the service requirement of the terminal device, that is, the notification administrator does not meet the requirement. A network slice of the business requirements of the terminal device. Thus the administrator can plan a network slice or the slice management system automatically generates a network slice based on the pre-configured policy. The feedback information may include the identifier information of the terminal device, the identifier information of the VPLMN, the identifier of the HPLMN, the SM-NSSAI of the home location, and QoS information.

 The embodiments of the present application are specifically described below in conjunction with specific application scenarios. Specifically, the process of selecting a specific CP in the network slice is described after selecting a public CP in the network slice.

In the following description, the configuration of the home SM-NSSAI is shown in Table 1, the configuration of the visited SM-NSSAI is Table 2, and the SM-NSSAI mapping relationship is shown in FIG. In order to clearly describe the network element of the home location and the network of the visited place, the network element indicating the visited place with V in front, for example, V.SSF indicates the SSF of the visited place. The SSF indicating the home location with H in front. As shown in FIG. 5, a schematic flowchart of a method for selecting a network slice according to an embodiment of the present application is as follows.

 5501, the terminal device accesses the VPLMN, and initiates an attach request (attach request) to the access network device of the VPLMN. V.AN„

 5502, V.AN selects the common CP function (CCNF) for the terminal device in the VPLMN, that is, selects V.AMF.

5503. The V.AN forwards the attach request to the V.AMF, so that the V.AMF performs mobility management processing based on the attach request.

 5504, V.AMF obtains contract and authentication information from V.HSS. The signing and authentication information includes the quality of the service (English: quality of service, QoS).

 5505, V.AMF initiates a Slice Select Request to the V.SSF. The slice selection request includes the condition information that the requested network slice should satisfy, where the condition information may include at least one of the following information: the identification information of the terminal device, the user information of the terminal device, the service type, User contracted service quality

(English: quality of Service, nickname: QoS) information, SM-NSSAI of the requested network slice.

 5506. The V.SSF sends a Slice Select Request to the H.SSF.

 5507. The H.SSF performs slice selection according to the condition information in the slice selection request (selecting the SM of the home location). For example, the selected network slice is slice HB, SM-NSSAI-H is 100, and the QoS information corresponding to slice HB is <lGbps, 10ms, >.

 5508. The H.SSF returns the slice information of the selected network slice to the V.SSF. The slice information may include SM-NSSAI-H being 100, and the QoS information corresponding to the network slice is <1 Gbps, 10 ms, ..., and the like.

 Specifically, the H.SSF sends a slice selection response to the V.SSF. Slice Select Response includes slice information of the selected network slice.

 After receiving the slice information of the network slice returned by the H.SSF, the V.SSF determines the SM-NSSAI-V of the network slice according to the slice information.

 Specifically, the network slice can be selected as follows.

 The first way to achieve:

 When the SM-NSSAI mapping relationship shown in Table 3 is configured on the V.SSF, the V.SSF determines that the SM-NSSAI-V corresponding to the SM-NSSAI-H (100) is 1 according to the SM-NSSAI mapping relationship.

 The second way to achieve:

 When the SM-NSSAI mapping relationship shown in Table 3 is not configured on the V.SSF, the V.SSF performs matching in the local network slice according to the QoS information returned by the H.SSF <1 Gbps, 10 ms, ... , match to get SM-NSSAI-V as

1 network slice.

 The third way to achieve:

 The roaming SM-NSSAI mapping relationship is not configured on the V.SSF, and the matching network slice is matched in the local network slice according to the QoS information returned by the H.SSF <1 Gbps, 10 ms, ... The notification message can be sent to the slice management system through the management interface, thereby notifying the administrator that there are users who cannot meet the experience requirements.

 The notification message may carry the ID of the terminal device, VPLMN, HPLMN, SM-NSSAI-H, QoS information, and the like.

5510, V.SSF selects the V.SM that satisfies the requirements in the network slice corresponding to SM-NSSAI-V. Specifically, according to the user's subscription QoS, local policy, mapping, or matching candidate SM-NSSAI corresponding to the terminal device, The V.SM that meets the requirements in the selected network slice is returned, and the V.SM information is returned to V.AMF. The V.SSF can obtain a local policy from the PCRF.

 S511. Perform a subsequent process of SM signaling.

 Based on the same inventive concept as the method embodiment, the embodiment of the present application provides a network slice selection apparatus, where the apparatus may be applied to a first SSF of a VPLMN or to a device for slice selection in a VPLMN, see As shown in FIG. 6, the device includes:

 The receiving unit 601 is configured to receive a slice selection request, where the slice selection request is used to request to select a network slice for the roaming terminal device, where the slice selection request includes condition information that the requested network slice should satisfy;

 The sending unit 602 is configured to send the condition information to the home public land mobile network HPLMN of the terminal device;

 Specifically, the sending unit 602 sends the condition information to the home public land mobile network HPLMN of the terminal device. After receiving the condition information, the selecting device of the network slice in the home public mobile mobile network HPLMN of the terminal device determines the first network slice that satisfies the condition information, and sends the network slice selection of the VPLMN through the home public land mobile network HPLMN. Device.

 The receiving unit 601 is further configured to receive slice information of the first network slice that is sent by the HPLMN and that meets the condition information.

 Specifically, the receiving unit 601 receives the slice information of the first network slice that is sent from the HPLMN and satisfies the condition information.

 The selecting unit 603 is configured to select, in the VPLMN, a second network slice for the terminal device based on the slice information of the first network slice.

 In one possible design, the condition information includes at least one of the following information:

 The identification information of the terminal device, the user information of the terminal device, the service type, and the user-signed service quality QoS information.

 In a possible design, the slice information includes first session management slice selection assistance information SM-NSSAI corresponding to the first network slice and/or QoS information satisfied by the first network slice.

 In a possible design, when the slice information includes the first SM-NSSAI, the selecting unit 603 is specifically configured to determine the first SM-NSSAI based on a pre-configured SM-NSSAI mapping relationship. Corresponding second SM-NSSAI, the second SM-NSSAI is attributed to the second network slice.

 In a possible design, the selecting unit 603 is further configured to: when the SM-NSSAI corresponding to the first SM-NSSAI does not exist in the SM-NSSAI mapping relationship, select a third terminal for the terminal device. Network slicing.

 In a possible design, when the slice information further includes QoS information that is satisfied by the first network slice, the selecting unit 603 is further configured to determine that the first part does not exist in the SM-NSSAI mapping relationship. When the SM-NSSAI corresponds to the SM-NSSAI, the first SSF selects a second network slice that satisfies the QoS information that the first network slice satisfies.

 In a possible design, when the slice information includes QoS information that is satisfied by the first network slice, the selecting unit 603 is further configured to select that the QoS information that is satisfied by the first network slice is selected. The second network slice.

In a possible design, the sending unit 602 is further configured to: when determining that the QoS information that is satisfied by the first network slice is not met, send feedback information to the slice management system, where the feedback information is used for notification management. No A network slice that satisfies the service requirements of the terminal device.

 The division of the unit in the embodiment of the present application is schematic, and is only a logical function division. In actual implementation, there may be another division manner. In addition, each functional unit in each embodiment of the present application may be integrated into one processing. In the device, it may be physically present alone, or two or more units may be integrated in one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

 As shown in FIG. 7, the selection means applied to the network slice in the VPLMN may include a communication interface 710, a processor 720, and a memory 730. The hardware of the entity corresponding to the unit shown in FIG. 6 above may be the processor 720. The processor 720 transmits and receives data through the communication interface 710 and is used to implement the method performed by the first SSF (V.SSF) described in FIG. 3 and FIG. In an implementation process, the various steps of the processing flow may be accomplished by integrated logic circuitry of the hardware in processor 720 or by instructions in software. The processor 720 can be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or a transistor logic device, a discrete hardware component, and can be implemented or executed in the embodiment of the present application. Various methods, steps, and logical block diagrams of the disclosure. The general purpose processor can be a microprocessor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly implemented as hardware processor execution completion, or performed by a combination of hardware and software units in the processor. The program code executed by the processor 720 for implementing the above method may be stored in the memory 730. The memory 730 may be a non-volatile memory, such as a hard disk drive (English: hard disk drive, abbreviated as HDD) or a solid state drive (English: solid-state drive, abbreviation: SSD), or a volatile memory (English: volatile Memory ), such as random access memory (English: random-access memory, abbreviation: RAM). Memory 730 is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited thereto.

 The specific connection medium between the communication interface 710, the processor 720, and the memory 730 is not limited in the embodiment of the present application. In the embodiment of the present application, the memory 730, the processor 720, and the communication interface 710 are connected by a bus 740 in FIG. 7. The bus is indicated by a thick line in FIG. 7, and the connection manner between other components is only schematically illustrated. , not limited to. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 7, but it does not mean that there is only one bus or one type of bus.

 The embodiment of the present application provides a device for selecting a network slice, the device is applied to a second SSF of the HPLMN, or applied to a device for slice selection in the HPLMN. Referring to FIG. 8, the device includes:

 The receiving unit 801 is configured to receive condition information that is sent by the VPLMN that visits the public land mobile network and is used to select a network slice for the roaming terminal device.

 a selecting unit 802, configured to select a first network slice that satisfies the condition information;

 The sending unit 803 is configured to send the slice information of the first network slice selected by the selecting unit 802 to the first SSF, so that the VPLMN is based on the slice information of the first network slice as the terminal The device selects the second network slice.

 In one possible design, the condition information includes at least one of the following information:

 The identification information of the terminal device, the user information of the terminal device, the service type, and the user-signed service quality QoS information.

As shown in FIG. 9, the selection means applied to the network slice in the HPLMN may include a communication interface 910, a processor 920, and a memory 930. The hardware of the entity corresponding to the unit shown in FIG. 8 above may be the processor 920. deal with The 920 transmits and receives data through the communication interface 910 and is used to implement the method performed by the second SSF (H.SSF) described in FIG. 3 and FIG. 5. In the implementation process, each step of the processing flow may be completed by an integrated logic circuit of hardware in the processor 920 or an instruction in the form of software. The processor 920 can be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or a transistor logic device, a discrete hardware component, and can be implemented or executed in the embodiment of the present application. Various methods, steps, and logical block diagrams of the disclosure. A general purpose processor can be a microprocessor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly implemented as hardware processor execution completion, or performed by a combination of hardware and software units in the processor. The program code executed by the processor 920 for implementing the above method may be stored in the memory 930. The memory 930 may be a non-volatile memory such as an HDD or SSD or the like, or may be a volatile memory such as a RAM. Memory 930 is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited thereto.

 The specific connection medium between the communication interface 910, the processor 920, and the memory 930 is not limited in the embodiment of the present application. In the embodiment of the present application, the memory 930, the processor 920, and the communication interface 910 are connected by a bus 940 in FIG. 9. The bus is indicated by a thick line in FIG. 9, and the connection manner between other components is only schematically illustrated. , not limited to. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 9, but it does not mean that there is only one bus or one type of bus.

 Those skilled in the art will appreciate that embodiments of the present application can be provided as a method, system, or computer program product. Thus, the application can be in the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the application can be embodied in the form of a computer program product embodied on one or more computer-usable storage media, including but not limited to disk storage, CD-ROM, optical storage, and the like.

 The present application is described with reference to flowchart illustrations and/or block diagrams of the method, apparatus (system), and computer program product according to the present application. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

 The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

 These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

 It will be apparent to those skilled in the art that various modifications and changes can be made in the present application without departing from the spirit and scope of the application. Thus, it is intended that the present invention cover the modifications and variations of the present invention.

Claims

 Rights request
A method for selecting a network slice, which is characterized by comprising:
 The first slice selection function SSF of the public land mobile network VPLMN receives a slice selection request, and the slice selection request is used to request the first SSF to select a network slice for the roaming terminal device, where the slice selection request includes the requested Conditional information that the network slice should satisfy;
 Sending, by the first SSF, the condition information to a second SSF of the home public land mobile network HPLMN of the terminal device;
 The first SSF receives the slice information of the first network slice that meets the condition information that is sent by the second SSF; the first SSF selects the second device for the terminal device based on the slice information of the first network slice. Network slicing. 1. The method according to claim 1, wherein the condition information includes at least one of the following information:
 The identification information of the terminal device, the user information of the terminal device, the service type, and the user-signed service quality QoS information.
 The method according to claim 1 or 1, wherein the slice information includes the first session management network slice selection assistance information SM-NSSAI corresponding to the first network slice and/or the first network slice satisfies QoS information.
 The method according to claim 3, wherein, when the slice information includes the first SM-NSSAI, the first SSF is based on the slice information of the first network slice as the terminal device Select the second network slice, including:
 The first SSF determines, according to the pre-configured SM-NSSAI mapping relationship, a second SM-NSSAI corresponding to the first SM-NSSAI, and the second SM-NSSAI belongs to the second network slice.
 The method of claim 4, wherein the method further comprises:
 When the first SSF determines that the SM-NSSAI corresponding to the first SM-NSSAI does not exist in the SM-NSSAI mapping relationship, the third network slice is selected for the terminal device.
 The method according to claim 4, wherein, when the slice information further includes QoS information that is satisfied by the first network slice, the method further includes:
 When the first SSF determines that the SM-NSSAI corresponding to the first SM-NSSAI does not exist in the SM-NSSAI mapping relationship, the first SSF selects the first QoS information that satisfies the first network slice. Two network slices.
 The method according to claim 3, wherein, when the slice information includes QoS information that is satisfied by the first network slice, the first SSF is based on slice information of the first network slice. The selecting, by the terminal device, the second network slice includes:
 The first SSF selects a second network slice that satisfies the QoS information that the first network slice satisfies.
 The method according to claim 6 or 7, wherein the method further comprises:
 When the first SSF determines that the QoS information that is satisfied by the first network slice is not met, the first SSF sends feedback information to the slice management system, where the feedback information is used to notify the administrator that the network does not meet the service requirements of the terminal device. slice.
9. A device for selecting a network slice, comprising: a receiving unit, configured to receive a slice selection request, where the slice selection request is used to request to select a network slice for the roaming terminal device, where the slice selection request includes condition information that the requested network slice should satisfy;
 a sending unit, configured to send the condition information to a home public land mobile network HPLMN of the terminal device, where the receiving unit is further configured to receive, by the HPLMN, a condition that satisfies the condition information in the HPLMN Slice information of a network slice;
 And a selecting unit, configured to select, according to the slice information of the first network slice, a second network slice for the terminal device.
10. The apparatus according to claim 9, wherein the condition information includes at least one of the following information:
 The identification information of the terminal device, the user information of the terminal device, the service type, and the user-signed service quality QoS information.
 The apparatus according to claim 9 or 10, wherein the slice information comprises first session management slice selection assistance information SM-NSSAI corresponding to the first network slice and/or QoS satisfied by the first network slice information.
 The device according to claim 11, wherein, when the slice information includes the first SM-NSSAI, the selecting unit is specifically configured to determine, according to a pre-configured SM-NSSAI mapping relationship, The second SM-NSSAI corresponding to the first SM-NSSAI, the second SM-NSSAI is attributed to the second network slice.
 The apparatus according to claim 12, wherein the selecting unit is further configured to: when it is determined that the SM-NSSAI corresponding to the first SM-NSSAI does not exist in the SM-NSSAI mapping relationship, The terminal device selects a third network slice.
 The apparatus according to claim 12, wherein, when the slice information further includes QoS information that is satisfied by the first network slice, the selecting unit is further configured to determine the SM-NSSAI mapping relationship. When there is no SM-NSSAI corresponding to the first SM-NSSAI, a second network slice that satisfies the QoS information that is satisfied by the first network slice is selected.
 The device according to claim 11, wherein the selecting unit is further configured to select that the first network slice is satisfied when the slice information includes QoS information that is satisfied by the first network slice. A second network slice of the QoS information that is satisfied.
 The device according to claim 14 or 15, wherein the sending unit is further configured to: when determining that the QoS information that is satisfied by the first network slice is not met, send the feedback information to the slice management system, The feedback information is used to notify the administrator that the network slice does not satisfy the service requirement of the terminal device.
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