CN113473564A - Network slice switching method, PDU session establishing method and device - Google Patents
Network slice switching method, PDU session establishing method and device Download PDFInfo
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Abstract
The embodiment of the application provides a method for switching network slices, a method for establishing a PDU session and a device, relates to the technical field of communication, and automatically realizes switching of the network slices. The method can comprise the following steps: the method comprises the steps that a first network element obtains current switching reference information of terminal equipment, wherein the current switching reference information is used for indicating latest position information or latest service information of the terminal equipment; the method comprises the steps that a first network element obtains a first AF network element and a first network slice identifier corresponding to current switching reference information in a corresponding relation of terminal equipment; and the first network element sends a first message to the first AF network element, wherein the first message comprises a first network slice identifier and an identifier of the terminal equipment, and the first message is used for establishing the PDU session between the terminal equipment and the network slice indicated by the first network slice identifier. The method and the device are used for switching the network slices.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method for switching network slices, and a method and an apparatus for establishing a Protocol Data Unit (PDU) session.
Background
With the rapid development of wireless communication technology, a fifth generation mobile communication network (5th generation mobile networks, 5G) will meet diversified application scenarios, and the existing single network architecture is difficult to meet differentiated performance indexes. As a new network technology, a Network Slice (NS) can provide a customized virtual network for different application requirements, not only can provide a network service with quality guarantee for users, but also can improve resource utilization efficiency by sharing resources, thereby reducing cost.
The international telecommunication standards organization third generation partnership project (3 GPP) standard supports simultaneous configuration and subscription of up to 8 network slices for a terminal device, but since the current phase is in the early stage of 5G network development, existing terminal devices do not support simultaneous access to multiple network slices. Therefore, when the location information or the service information of the terminal device changes, the user is required to operate on the terminal device to reselect the network slice, which results in a decrease in the network use experience of the user.
Disclosure of Invention
The application provides a method for switching network slices, a method for establishing PDU session and a device, which can realize automatic switching of network slices when switching reference information of terminal equipment is changed, and improve user experience.
In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:
in a first aspect, a method for network slice handover is provided, where the method includes: the method comprises the steps that a first network element obtains current switching reference information of terminal equipment, wherein the current switching reference information is used for indicating latest position information or latest service information of the terminal equipment; a first network element acquires a first Application Function (AF) network element and a first network slice identifier corresponding to current switching reference information in a corresponding relation of terminal equipment; the corresponding relation is the corresponding relation between different switching reference information of the terminal equipment and the AF network element and the network slice identifier, the first network element sends a first message to the first AF network element, the first message comprises the first network slice identifier and the identifier of the terminal equipment, and the first message is used for establishing PDU conversation between the terminal equipment and the network slice indicated by the first network slice identifier.
That is to say, when the handover reference information of the terminal device changes, the first network element obtains the current handover reference information of the terminal device, and sends a message containing the first network slice identifier to the first AF network element by obtaining the first AF network element and the first network slice identifier corresponding to the current reference information in the correspondence relationship of the terminal device, so as to establish a connection between the terminal device and the network slice indicated by the first network slice identifier, thereby implementing the handover of the network slice. Therefore, when the current switching reference information of the terminal equipment is changed, the first network element can automatically acquire the network slice matched with the current switching reference information, and automatically switch and connect to the network slice by triggering and establishing the PDU session between the terminal equipment and the network slice, so that the process of switching the network slice by the user on the terminal equipment is replaced, and the user experience is improved.
In one possible design, the method for network slice handover provided by the present application may further include: and the first network element and the second network element establish subscription service, and the subscription service is used for subscribing the change of the switching reference information of the terminal equipment. Correspondingly, the obtaining, by the first network element, the current handover reference information of the terminal device includes: and the first network element receives the current switching reference information from the second network element after the switching reference information of the terminal equipment is changed. By establishing the subscription service between the first network element and the second network element, when the switching reference information acquired by the second network element to the terminal equipment changes, the second network element automatically sends the current switching reference information to the first network element, and the first network element automatically acquires the current switching reference information.
In a possible design, the obtaining, by the first network element, the correspondence relationship of the terminal device may include: the first network element acquires subscription information of the terminal device from the third network element, wherein the subscription information comprises a corresponding relation.
In one possible design, the method for network slice handover provided by the present application may further include: the first network element determines the change of the switching reference information of the terminal equipment; the first network element initiates a PDU session release process of the terminal equipment.
In a second aspect, a method for establishing a PDU session is provided, and a method for network slice handover provided by the present application may include: the method comprises the steps that a first AF network element receives a first message from a first network element, wherein the first message comprises a first network slice identifier and an identifier of terminal equipment; and the first AF network element sends a first network slice identifier to the terminal equipment, wherein the first network slice identifier is used for indicating the establishment of the PDU session between the terminal equipment and the network slice indicated by the first network slice identifier.
That is to say, the first AF network element receives the first network slice identifier and the identifier of the terminal device sent by the first network element, and then sends the first network slice identifier to the terminal device, so that the terminal device automatically switches to the network slice.
In one possible design, the method for establishing a PDU session provided in the present application may further include: the method comprises the steps that a first AF network element obtains the corresponding relation of terminal equipment, wherein the corresponding relation is the corresponding relation of different switching reference information of the terminal equipment, the AF network element and a network slice identifier; and the first AF network element stores the corresponding relation in a third network element.
In a third aspect, an apparatus for network slice switching is provided, the apparatus comprising: the device comprises a first acquisition unit, a second acquisition unit and a sending unit. Wherein:
the terminal equipment comprises a first acquisition unit, a second acquisition unit and a switching unit, wherein the first acquisition unit is used for acquiring current switching reference information of the terminal equipment, and the switching reference information is used for indicating latest position information or latest service information of the terminal equipment.
The second obtaining unit is used for obtaining a first AF network element and a first network slice identifier corresponding to the current switching reference information in the corresponding relation of the terminal equipment; the corresponding relation is the corresponding relation between different switching reference information of the terminal equipment and the AF network element and the network slice identifier;
and the sending unit is used for sending a first message to the first AF network element, wherein the first message comprises a first network slice identifier and an identifier of the terminal equipment, and the first message is used for establishing a PDU session between the terminal equipment and the network slice indicated by the first network slice identifier.
That is to say, when the handover reference information of the terminal device changes, the first network element obtains the current handover reference information of the terminal device, and sends a message containing the first network slice identifier to the first AF network element by obtaining the first AF network element and the first network slice identifier corresponding to the current reference information in the correspondence relationship of the terminal device, so as to establish a connection between the terminal device and the network slice indicated by the first network slice identifier, thereby implementing the handover of the network slice. Therefore, when the current switching reference information of the terminal equipment is changed, the first network element can automatically acquire the network slice matched with the current switching reference information, and automatically switch and connect to the network slice by triggering and establishing the PDU session between the terminal equipment and the network slice, so that the process of switching the network slice by the user on the terminal equipment is replaced, and the user experience is improved.
It should be noted that, the third aspect provides an apparatus for network slice switching, which is used to implement the method for network slice switching described in any one of the above possible designs of the first aspect, and its specific implementation may refer to a specific implementation of the method for network slice switching described in any one of the above possible designs of the first aspect.
In a fourth aspect, an apparatus for establishing a PDU session is provided, the apparatus comprising: a receiving unit, configured to receive a first message from a first network element, where the first message includes a first network slice identifier and an identifier of a terminal device; and the sending unit is used for sending a first network slice identifier to the terminal equipment, wherein the first network slice identifier is used for indicating the establishment of the PDU session between the terminal equipment and the network slice indicated by the first network slice identifier.
That is to say, the first AF network element receives the first network slice identifier and the identifier of the terminal device sent by the first network element, and then sends the first network slice identifier to the terminal device, so that the terminal device automatically switches to the network slice.
It should be noted that, the apparatus for establishing a PDU session provided in the fourth aspect is used to implement the method for establishing a PDU session described in any one of the possible designs of the second aspect, and its specific implementation may refer to the specific implementation of the method for establishing a PDU session described in any one of the possible designs of the second aspect.
In one possible design, the apparatus further includes: the device comprises an acquisition unit, a processing unit and a processing unit, wherein the acquisition unit is used for acquiring the corresponding relation of the terminal equipment, and the corresponding relation is the corresponding relation of different switching reference information of the terminal equipment, AF network elements and network slice identifiers; and the storage unit is used for storing the corresponding relation in the third network element.
In a fifth aspect, a communication network element is provided, which includes: one or more processors, and a memory; a memory coupled with the one or more processors; the memory is used for storing computer program code comprising instructions which, when executed by the one or more processors, cause the communication network element to perform any one of the methods provided in the first or second aspect.
In a sixth aspect, a computer-readable storage medium is provided, which comprises computer instructions that, when executed on a computer, cause the computer to perform any one of the methods provided by the first or second aspects.
In a seventh aspect, a computer program product is provided, which comprises computer instructions, when the computer instructions are run on a computer, the computer is caused to perform any one of the methods provided in the first aspect or the second aspect.
Based on the above invention, by establishing the subscription service between the first network element and the second network element, the handover reference information of the subscribing terminal device changes, when the second network element acquires that the switching reference information of the terminal equipment changes, the current switching reference information of the terminal equipment is sent to the first network element, thus, the first network element can automatically acquire the current handover reference information of the terminal device, and by acquiring the corresponding relationship of the terminal device (the first network element can acquire the subscription information of the terminal device from the third network element, the subscription information includes the corresponding relationship of the terminal device), a first AF network element corresponding to the current reference information and a first network slice identifier, sending a message containing the first network slice identifier to the first AF network element, and then the terminal equipment is connected with the network slice indicated by the first network slice identifier, so that the switching of the network slice is realized.
Therefore, when the current switching reference information of the terminal equipment is changed, the first network element can automatically acquire the network slice matched with the current switching reference information, and automatically switch and connect to the network slice by triggering and establishing the PDU session between the terminal equipment and the network slice, so that the automatic switching of the network slice is realized, the manual operation of a user on the terminal equipment is avoided, and the user experience is improved.
Drawings
Fig. 1 is a schematic diagram of a 5G communication system according to an embodiment of the present disclosure;
fig. 2 is a flowchart illustrating a method for network slice switching according to an embodiment of the present application;
fig. 3 is a flowchart illustrating a method for network slice switching according to an embodiment of the present application;
fig. 4 is a flowchart illustrating a method for network slice switching according to an embodiment of the present application;
fig. 5a is a schematic structural diagram of an apparatus for network slice switching according to an embodiment of the present application;
fig. 5b is a schematic structural diagram of an apparatus for network slice switching according to an embodiment of the present application;
fig. 6a is a schematic structural diagram of an apparatus for establishing a PDU session according to an embodiment of the present application;
fig. 6b is a schematic structural diagram of an apparatus for establishing a PDU session according to an embodiment of the present application;
fig. 7 is a schematic hardware structure diagram of a communication network element according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Where in the description of the present application, "/" indicates a relationship where the objects associated before and after are an "or", unless otherwise stated, for example, a/B may indicate a or B; in the present application, "and/or" is only an association relationship describing an associated object, and means that there may be three relationships, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. Also, in the description of the present application, "a plurality" means two or more than two unless otherwise specified. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple. In addition, in order to facilitate clear description of technical solutions of the embodiments of the present application, in the embodiments of the present application, terms such as "first" and "second" are used to distinguish the same items or similar items having substantially the same functions and actions. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.
In addition, the network architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not constitute a limitation to the technical solution provided in the embodiment of the present application, and it can be known by a person skilled in the art that the technical solution provided in the embodiment of the present application is also applicable to similar technical problems along with the evolution of the network architecture and the appearance of a new service scenario.
The technical scheme provided by the application can be applied to a mobile communication system with network slices deployed. The mobile communication system may include: terminal equipment, access network equipment and core network equipment.
The access network device provides an access network to the coverage area, and the core network device provides a core network as a channel for data transmission. The terminal device is accessed to the access network device, and further accesses a Data Network (DN) and the like through a core network connected with the access network device, so that the terminal device accesses the DN data to realize service data transmission. Or the terminal device accesses the access network device, and further realizes data transmission with other terminal devices through a core network connected with the access network device.
The mobile communication network may be a 4G network, a 5G network, or a network of other systems, which is not limited in this embodiment of the present application.
Illustratively, the mobile communication network may include: the system comprises terminal equipment, an access network element, a mobility management element, a session management element, a user plane element, a policy control element, a network slice selection element, a network data analysis element, an application function element and a DN.
A terminal device, also referred to as a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), etc., is a device that provides voice and/or data connectivity to a user. For example, the terminal includes a handheld device, a vehicle-mounted device, and the like having a wireless connection function. Currently, the terminal may be: a mobile phone (mobile phone), a tablet computer, a notebook computer, a palm top computer, a Mobile Internet Device (MID), a wearable device, a Virtual Reality (VR) device, an Augmented Reality (AR) device, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned driving (self), a wireless terminal in remote surgery (remote medical supply), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in city (smart city), a wireless terminal in smart home (smart home), and the like.
AN Access Network (AN) is responsible for wireless side access of a terminal, and includes a gbb/NR-NB, a Transmission Reception Point (TRP), AN evolved node B (eNB), a Radio Network Controller (RNC), a Node B (NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a home base station (e.g., a home evolved node B (HNB), a Base Band Unit (BBU), or a wireless fidelity (Wifi) Access Point (AP).
A mobility management network element, which may be an access and mobility management entity (AMF) in 5G; or, the control plane function (SGW-C) of the Serving GateWay (SGW) in 4G or the Mobility Management Entity (MME); or all or part of the control function formed by the fusion of the network elements. The mobility management network element is responsible for access and mobility management of the terminal in the mobile network.
And the session management network element is responsible for forwarding path management, and if a message forwarding strategy is issued to the user plane network element, the user plane network element is instructed to process and forward the message according to the message forwarding strategy. The session management network element may be a Session Management Function (SMF) in 5G, and is responsible for session management, such as session creation/modification/deletion, user plane network element selection, and allocation and management of user plane tunnel information. The session management network element may also be a control plane function (SGW-C) of a serving gateway in 4G or a control plane function (PGW-C) of a Packet Data Network (PDN) gateway (gateway way, GW), and the session management network element may also be all or part of a control function formed after fusion of an SMF and a PGW-C network element.
The user plane network element may be a User Plane Function (UPF) in a 5G architecture. The UPF is responsible for message processing and forwarding. The user plane network element may also be a forwarding plane function (PGW-U) of the PGW, a forwarding plane function (SGW-U) of the SGW, a router, a switch, or other physical or virtual forwarding devices.
The policy control network element may be a Policy Control Function (PCF) entity in a 5G architecture, and may be responsible for functions such as policy control decision.
The network slice selection network element (or network slice selection function/network slice selection function entity) may be a Network Slice Selection Function (NSSF) in a 5G architecture, and is configured to select a suitable network slice for a service of a terminal.
The network data analysis network element (or network data analysis function/network data analysis functional entity) may be a network data analysis function (NWDAF) in a 5G architecture, and is configured to provide service functions, such as data storage and analysis, for a terminal or a network.
The DN, which provides a data transmission Service for the terminal, may be a PDN network, such as the internet (internet), IP Multimedia Service (IMS), and the like.
And the AF network element is a network element for providing an application service and mainly performs dynamic policy/charging control on the IP-CAN user plane behavior. These services require dynamic policy and charging control. The AF transmits dynamic session information required by the PCRF through the Rx reference point, and receives specific information of an IP connection access network (IP-CAN) and confirmation of an IP-CAN bearer layer event.
It should be noted that, the network element described in this embodiment of the present application may also be referred to as a function or a functional entity, for example, a mobility management network element may also be referred to as a mobility management function or a mobility management functional entity, a session management network element may also be referred to as a session management function or a session management functional entity, a user plane network element may also be referred to as a user plane function or a user plane functional entity, and a policy control function may also be referred to as a policy control functional entity or a policy control network element.
The names of the network elements are not limited in this application, and those skilled in the art can replace the names of the network elements with other names to perform the same functions, all of which belong to the protection scope of this application.
Illustratively, fig. 1 illustrates a 5G system architecture.
Currently, 3GPP protocols define network slices to provide customized virtual networks for different application requirements. Network switching is realized by deploying a network slice instance. An example of a network slice is a static network, which means that different logical networks are customized according to different service requirements on a physical or virtual network infrastructure. The example network slice may be a complete end-to-end network including the terminal, the access network, the transport network, the core network and the application server, and may provide complete communication services with certain network capabilities. The network slice instance may also be any combination of terminal, access network, transport network, core network and application server. In the description of the embodiments of the present application, both the network slice instance and the network slice type are represented by a network slice, and when describing the network slice, the network slice instance and the network slice type may be referred to as a network slice type or a network slice instance.
First, in order to facilitate understanding of the embodiments of the present application, some technical terms related to the embodiments of the present application are described:
network Slice (NS): the method is a logical network with specific network characteristics, and is a key technology for meeting the requirements of a 5G mobile communication network proposed by 3GPP on network differentiation. Different network slices are logically isolated, and one or more network services can be flexibly provided according to the requirements of a demand side. A network slice is identified by single network slice selection assistance information (S-NSSAI). The S-NSSAI is composed of a Slice Service Type (SST) and a slice differentiation identifier (SD).
PDU conversation: for transmitting data between the terminal equipment and the data network, a PDU session can only be established within one slice. To select a slice for establishing a PDU session, the HPLMN provides a Network Slice Selection Policy (NSSP) to the UE, which associates an application to one or more HPLMN S-NSSAIs.
On one hand, the embodiment of the application provides a method for switching network slices and a method for establishing a PDU session, which are used for switching the network slices by terminal equipment. It should be noted that the process of switching network slices for each terminal device is the same, and the following embodiments of the present application only describe the process of switching network slices for one terminal device, and the others are not described in detail any more.
As shown in fig. 2, the method may include the steps of:
s201, the first network element obtains the current switching reference information of the terminal equipment.
The switching reference information is used for describing any information needing network slice switching. For example, the handover reference information may indicate location information or service information of the terminal device.
The current handover reference information may be used to indicate the latest location information or the latest service information of the terminal device.
Wherein the location information refers to geographical location information. For example, the location information may be specific geographic coordinates, or the location information may be a cell identification, or otherwise.
The service information may be an identification of the service or other information indicating the service. The service may be any data service, voice service or others supported by the terminal device.
In a possible implementation manner, the first network element may obtain current handover reference information of the terminal device from the second network element.
For example, as shown in fig. 3, before S201, the method for network slice switching provided by the present application may further include S201 a.
S201a, the first network element and the second network element establish a subscription service.
The subscription service is used for subscribing the switching reference information of the terminal equipment to change. It should be understood that, by establishing the subscription service, the second network element notifies the first network element when the handover reference information obtained from the terminal device changes.
In a possible implementation manner, if the handover reference information is used to indicate the latest location information of the terminal device, the first network element may be a PCF network element, and the second network element may be an AMF network element.
In another possible implementation manner, if the handover reference information is used to indicate the latest service information of the terminal device, the first network element may be a PCF network element, and the second network element may be an AF network element.
Specifically, the method for establishing a subscription service between a first network element and a second network element includes the following steps 1 to 3:
step 1, the first network element sends a request message for establishing subscription service to the second network element.
The subscription service request information carries: event ID, event report type, indication reporting UE location, target UE for event reporting, event reporting mode, etc.
And step 2, the second network element receives the subscription service establishment request information sent by the first network element and sends subscription response information to the first network element.
And step 3, the first network element receives subscription response information sent by the second network element.
That is, after the first network element receives the subscription response information sent by the second network element, the subscription service is successfully established.
Optionally, when S201a is executed before S201, after monitoring that the handover reference information of the terminal device changes, the second network element obtains the latest handover reference information of the terminal device, and sends the latest handover reference information of the terminal device to the first network element. Correspondingly, S201 may be specifically implemented as that the first network element receives the current handover reference information from the second network element after the handover reference information of the terminal device changes.
Further, as shown in fig. 3, the method for network slice switching provided in the embodiment of the present application may further include S201b and S201 c.
S201b, the first network element determines that the handover reference information of the terminal device changes.
Specifically, the first network element may determine that the handover reference information of the terminal device changes after acquiring the current handover reference information of the terminal device.
S201c, the first network element initiates a PDU session release procedure of the terminal device.
After the PDU session release flow is initiated, the UE is triggered to cut out the original network slice.
For example, the first network element may execute S201c according to 4.3.4PDU session release (PDU session release) in the 3GPP TS23.502V16.6.0(2020-09) protocol, and a specific process of the first network element is not described in detail in this embodiment.
S202, the first network element obtains a first AF network element and a first network slice identifier corresponding to the current handover reference information in the correspondence relationship between the terminal devices.
The corresponding relation of the terminal equipment is the corresponding relation between different switching reference information of the terminal equipment and AF network elements and network slice identifications. The corresponding relationship may be configured when the terminal device registers in the network, or may be configured at other occasions, which is not limited in this embodiment of the present application.
It should be understood that, if the handover reference information is location information, in the correspondence relationship of the terminal device, the AF network element corresponding to the location information is an AF network element that provides a service to the location indicated by the location information. If the switching reference information is service information, one row in the corresponding relationship of the terminal device includes the position information and the AF network element corresponding to the service information, and the AF network element is an AF network element that provides the service indicated by the service information corresponding to the position indicated by the position information corresponding to the AF network element.
Alternatively, the network slice identity may be S-NSSAI.
For example, the correspondence relationship may be as shown in table 1. In table 1, the handover reference information is illustrated as location information.
TABLE 1
It should be noted that table 1 only exemplifies the corresponding relationship of the terminal device by way of example, and both the content and the form of the corresponding relationship may be configured according to actual requirements, which is not limited in this embodiment of the application.
In a possible implementation manner, the first network element may obtain subscription information of the terminal device from the third network element, where the subscription information includes a corresponding relationship.
Illustratively, the third network element may be a Unified Data Management (UDM) network element.
It should be noted that the corresponding relationship of the terminal device stored in the third network element may be configured in advance, or configured in the registration process of the terminal device, or sent by the AF network element.
S203, the first network element sends a first message to the first AF network element.
The first message comprises a first network slice identifier and the identifier of the terminal equipment, and the first message is used for establishing a PDU session between the terminal equipment and the network slice indicated by the first network slice identifier.
Alternatively, the identifier of the terminal device may be an International Mobile Equipment Identity (IMEI) or subscription permanent identifier (SUPI) of the terminal device, or others.
For example, before S203, the method for switching network slices provided by the present application may further include: establishing event subscription service between AF network element and first network element
The event subscription service is used for subscribing to send a first message to the AF network element when the first network element acquires that the handover reference information corresponds to the AF network element.
Specifically, the establishing of the event subscription service between the AF network element and the first network element includes the following steps a and b:
step a, the AF network element sends event subscription request information to the first network element.
Optionally, the event subscription request information carries: target UE for event reporting, event reporting type, etc.
The target UE of the event report may be an identifier of the terminal device performing network handover and supported by the AF. The event report type may be: and switching to the target network slice. Accordingly, the event subscription request information sent by the AF network element to the first network element may be used to send the first message to the AF network element if it is determined that the current handover reference information corresponds to the AF network element when the first network element determines that the handover reference information of the target UE changes and needs to switch the network slice.
And step b, the first network element sends successful establishment information of the event subscription request to the AF network element.
Namely, the AF network element and the first network element successfully establish the event subscription service.
Thus, after the first network element determines that the first AF network element is reached, the first network element directly sends the first message to the first AF network element.
S204, the first AF network element receives a first message from the first network element.
Wherein the first message comprises the first network slice identifier and the identifier of the terminal device.
S205, the first AF network element sends a first network slice identifier to the terminal equipment.
The first network slice identifier is used for indicating the establishment of the PDU session between the terminal equipment and the network slice indicated by the first network slice identifier.
S206, the terminal equipment receives the first network slice identifier.
S207, the terminal equipment and the first network slice establish a PDU session.
The process of establishing the PDU session between the terminal device and the network slice may be executed according to 4.13.2 application triggering (application triggering) and 4.3.2PDU session establishment (PDU session initialization) in a 3GPP TS23.502V16.6.0(2020-09) protocol, and details of the specific process are not described in this application embodiment.
The switching of the terminal device to the first network slice is completed through S207.
According to the scheme provided by the application, when the switching reference information of the terminal equipment is changed, the first network element acquires the current switching reference information of the terminal equipment, and sends the message containing the first network slice identifier to the first AF network element by acquiring the first AF network element and the first network slice identifier corresponding to the current reference information in the corresponding relation, so that the terminal equipment is connected with the network slice indicated by the first network slice identifier, and the switching of the network slice is further realized. Therefore, when the current switching reference information of the terminal equipment is changed, the first network element can automatically acquire the network slice matched with the current switching reference information, and automatically switch and connect to the network slice by triggering and establishing the PDU session between the terminal equipment and the network slice, so that the process of switching the network slice by the user on the terminal equipment is replaced, and the user experience is improved.
By way of example, the following takes a 5G network as an example to describe the scheme provided in the present application. As shown in fig. 4, the method for network slice handover provided by the present application may include:
s401, the AF network element sends the slice subscription information of the application to the UDM network element through a network open function (NEF) network element.
The slice subscription information includes UE handover reference information and association information (i.e. the aforementioned corresponding relationship) between the AF and the subscribed S-NSSAI.
S402, UE registration process.
And the UE registers the network communication authority through a registration process. The UE may perform the Registration procedure (Registration procedure) according to a 4.2.2.2 Registration procedure in a 3GPP TS23.502V16.6.0(2020-09) protocol, and a specific process of the UE is not described in detail in this embodiment.
S403, the PCF network element sends a Namf event report subscription request (Namf event request) message to the AMF network element.
The Namf event report subscription request message is used for the PCF network element to subscribe the UE mobility event notification service request to the AMF network element, and requests to feed back the latest position information of the UE to the PCF when the position information of the UE changes.
S404, the AMF network element returns a response message of the naff event report subscription request (naff event request) message of the PCF network element.
Through S403 and S404, the PCF network element establishes a subscription notification service completion to the AF network element.
S405, the AF network element sends an Npcf event report subscription request (Npcf event request) message to the PCF network element through the NEF network element.
The Npcf event report subscription request message is used for subscribing a policy control event notification service, and requests that when the PCF determines that the location information of the target UE changes and needs to switch a network slice, if it is determined that the current switching reference information corresponds to the AF network element, the identifier of the target network slice is sent to the AF network element.
S406, the PCF network element returns a subscription service request response to the AF network element through the NEF network element.
The subscription service request response may be a hypertext transfer protocol (HTTP) status code "201 Created" request response.
Thus, the AF network element completes the establishment of the subscription service to the PCF network element.
S407, the UE position information is changed, the UE enters or leaves a state reporting area (PRA), the PCF network element triggers and initiates a PDU session release process, and the UE cuts out the original network slice.
S408, the AMF network element sends a location reporting control (location reporting control) request to a Radio Access Network (RAN) network element to request a UE location report.
S409, the RAN network element returns a location report (location report) to the AMF network element, and the location report carries the target UE location information.
S410, the AMF network element sends a Namf event report notification (naff event notification) to the PCF network element, and the Namf event report notification carries the latest position information of the target UE.
S411, PCF network element sends request to UDM network element to obtain UE subscription data.
S412, the UDM network element returns information to the PCF network element, and the information carries the UE subscription data.
The subscription data comprises the position information of the UE and the associated information of the AF network element and the S-NSSAI subscribed.
S413, the PCF network element compares and matches the position information of the UE based on the UE position information received from the AMF network element and the UE position information received from the UDM network element and the associated information sets of the AF network element and the signed S-NSSAI.
S414, if the UE location information received by the PCF from the AMF network element matches the UE location information in the association information set received from the UDM network element, and the matched UE location information is consistent, the PCF sends an Npcf event report notification (Npcf event notification) message to the associated AF network element according to the latest location information of the UE.
Wherein, the Npcf event report notification message carries an event report type, a UE identity, and the like.
S415, the AF network element executes an application triggering (application triggering) procedure, and sends a trigger message (trigger message) carrying the S-NSSAI signed by the AF to the application on the UE side.
The trigger message causes the application at the UE side to trigger the PDU session setup procedure.
S416, the UE executes the PDU session establishing process and establishes the PDU session with the S-NSSAI sent by the AF network element.
And after the PDU session is successfully established, the UE accesses the network slice corresponding to the position information after the UE moves.
The above mainly introduces the scheme provided by the present application from the perspective of interaction between the nodes. It will be appreciated that each node, e.g. device, for implementing the above-described functionality, comprises corresponding hardware structures and/or software modules for performing the respective functionality. Those of skill in the art will readily appreciate that the present invention can be implemented in hardware or a combination of hardware and computer software, in conjunction with the exemplary algorithm steps described in connection with the embodiments disclosed herein. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The present application may perform division of functional modules on the apparatus according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, the division of the modules in the present application is schematic, and is only a logical function division, and there may be another division manner in actual implementation.
Fig. 5a is a schematic diagram illustrating an apparatus for network slice switching according to an embodiment of the present application. As shown in fig. 5a, the apparatus 50 for network slice switching comprises: a first acquisition unit 501, a second acquisition unit 502 and a transmission unit 503.
The first obtaining unit 501 is configured to obtain current handover reference information of a terminal device, where the handover reference information is used to indicate latest location information or latest service information of the terminal device; for example, the first obtaining unit 501 may be configured to execute the process S201 illustrated in fig. 2.
A second obtaining unit 502, configured to obtain a first AF network element and a first network slice identifier corresponding to the current handover reference information in the correspondence relationship between the terminal devices; the corresponding relation is the corresponding relation between different switching reference information of the terminal equipment and the AF network element and the network slice identifier. For example, the second obtaining unit 502 may be used to perform the process S202 illustrated in fig. 2.
A sending unit 503, configured to send a first message to the first AF network element, where the first message includes a first network slice identifier and an identifier of the terminal device, and the first message is used to establish a PDU session between the terminal device and a network slice indicated by the first network slice identifier. For example, the sending unit 503 may be configured to execute the process S203 illustrated in fig. 2.
Optionally, as shown in fig. 5b, the apparatus 50 for network slice switching may further include: a subscription unit 504, a determination unit 505 and a processing unit 506.
The subscribing unit 504 is configured to establish a subscription service with the second network element, where the subscription service is used to subscribe to a change of the handover reference information of the terminal device. For example, the subscribing unit 504 may be configured to execute the process S201a illustrated in fig. 2.
The first obtaining unit 501 is specifically configured to receive current handover reference information from the second network element after the handover reference information of the terminal device changes. .
The second obtaining unit 502 is specifically configured to obtain subscription information of the terminal device from the third network element, where the subscription information includes a corresponding relationship.
Optionally, the determining unit 505 is configured to determine that the handover reference information of the terminal device changes.
Optionally, the processing unit 506 is configured to initiate a PDU session release procedure of the terminal device.
Fig. 6a is a schematic diagram illustrating an apparatus for establishing a PDU session according to an embodiment of the present application. As shown in fig. 6a, the apparatus 60 for establishing a PDU session includes: receiving section 601 and transmitting section 602.
The receiving unit 601 is configured to receive a first message from a first network element, where the first message includes a first network slice identifier and an identifier of a terminal device. For example, the receiving unit 601 may be configured to perform the process S204 illustrated in fig. 2.
A sending unit 602, configured to send a first network slice identifier to a terminal device, where the first network slice identifier is used to indicate that a PDU session between the terminal device and a network slice indicated by the first network slice identifier is established. For example, the sending unit 602 may be configured to perform the procedure S205 illustrated in fig. 2.
Optionally, as shown in fig. 6b, the apparatus 60 for establishing a PDU session further includes: an acquisition unit 603 and a storage unit 604.
Optionally, the obtaining unit 603 is configured to obtain a corresponding relationship of the terminal device, where the corresponding relationship is a corresponding relationship between different location information of the terminal device and the AF network element and the network slice identifier.
Optionally, the storing unit 604 is configured to store the corresponding relationship in the third network element.
The units in fig. 5a, 5b, 6a and 6b may also be referred to as modules, e.g. the processing units may be referred to as processing modules. In addition, in the embodiment shown in fig. 5a, the name of each unit may not be the name shown in the figure, and for example, the acquiring unit may also be referred to as an input unit.
As shown in fig. 7, the communication network element 70 includes a processor 701, and optionally, the apparatus 70 further includes a memory 702 and a transceiver 703, which are connected to the processor 701. The processor 701, memory 702, and transceiver 703 are connected by a bus 704.
The processor 701 may be a Central Processing Unit (CPU), a general purpose processor Network (NP), a Digital Signal Processor (DSP), a microprocessor, a microcontroller, a Programmable Logic Device (PLD), or any combination thereof. The processor may also be any other means having a processing function such as a circuit, device or software module. The processor 701 may also include a plurality of CPUs, and the processor 701 may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, or processing cores that process data (e.g., computer program instructions).
The transceiver 703 may be used to communicate with other devices or communication networks such as ethernet, RAN, Wireless Local Area Networks (WLANs), etc.). The communication interface may be a module, a circuit, a transceiver, or any device capable of enabling communication.
The bus 704 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus 704 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 7, but this is not intended to represent only one bus or type of bus.
The respective units in fig. 5a, 5b, 6a and 6b, if implemented in the form of software functional modules and sold or used as independent products, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially implemented or make a contribution to the prior art, or all or part of the technical solutions may be implemented in the form of a software product stored in a storage medium, and including several instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the methods described in the embodiments of the present application. A storage medium storing a computer software product comprising: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented using a software program, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer-executable instructions. The processes or functions described in accordance with the embodiments of the present application occur, in whole or in part, when computer-executable instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer executable instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer executable instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). Computer-readable storage media can be any available media that can be accessed by a computer or can comprise one or more data storage devices, such as servers, data centers, and the like, that can be integrated with the media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
Embodiments of the present application also provide a computer-readable storage medium, which includes computer-executable instructions, which, when executed on a computer, cause the computer to perform any one of the methods described above.
Embodiments of the present application also provide a computer program product comprising computer executable instructions, which when run on a computer, cause the computer to perform any of the above methods.
An embodiment of the present application further provides a chip, including: a processor coupled to the memory through the interface, and an interface, when the processor executes the computer program or the computer execution instructions in the memory, the processor causes any one of the methods provided by the above embodiments to be performed.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented using a software program, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer-executable instructions. The processes or functions described in accordance with the embodiments of the present application occur, in whole or in part, when computer-executable instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer executable instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer executable instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). Computer-readable storage media can be any available media that can be accessed by a computer or can comprise one or more data storage devices, such as servers, data centers, and the like, that can be integrated with the media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
While the present application has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
Although the present application has been described in conjunction with specific features and embodiments thereof, it will be evident that various modifications and combinations can be made thereto without departing from the spirit and scope of the application. Accordingly, the specification and figures are merely exemplary of the present application as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the present application. It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (14)
1. A method of network slice handover, the method comprising:
a first network element acquires current switching reference information of terminal equipment, wherein the current switching reference information is used for indicating latest position information or latest service information of the terminal equipment;
the first network element acquires a first AF network element and a first network slice identifier corresponding to the current switching reference information in the corresponding relation of the terminal equipment; the corresponding relation is the corresponding relation between different switching reference information of the terminal equipment and AF network elements and network slice identifiers;
and the first network element sends a first message to the first AF network element, wherein the first message comprises the first network slice identifier and the identifier of the terminal equipment, and the first message is used for establishing the PDU session between the terminal equipment and the network slice indicated by the first network slice identifier.
2. The method of claim 1,
the method further comprises the following steps: the first network element and the second network element establish a subscription service, and the subscription service is used for subscribing the change of the switching reference information of the terminal equipment;
the acquiring, by the first network element, current handover reference information of the terminal device includes: and the first network element receives the current switching reference information from the second network element after the switching reference information of the terminal equipment is changed.
3. The method according to claim 1 or 2, wherein the obtaining, by the first network element, the correspondence of the terminal device includes:
and the first network element acquires the subscription information of the terminal equipment from a third network element, wherein the subscription information comprises the corresponding relation.
4. The method according to claim 1 or 2, characterized in that the method further comprises:
the first network element determines that the switching reference information of the terminal equipment changes;
and the first network element initiates a PDU session release process of the terminal equipment.
5. A method for establishing a PDU session, the method comprising:
a first AF network element receives a first message from a first network element, wherein the first message comprises a first network slice identifier and an identifier of terminal equipment;
and the first AF network element sends the first network slice identifier to the terminal equipment, wherein the first network slice identifier is used for indicating the establishment of the PDU session between the terminal equipment and the network slice indicated by the first network slice identifier.
6. The method of claim 5, further comprising:
the first AF network element acquires a corresponding relation of the terminal equipment, wherein the corresponding relation is the corresponding relation of different switching reference information of the terminal equipment, AF network elements and network slice identifiers;
and the first AF network element stores the corresponding relation in a third network element.
7. An apparatus for network slice switching, the apparatus comprising:
a first obtaining unit, configured to obtain current handover reference information of a terminal device, where the current handover reference information is used to indicate latest location information or latest service information of the terminal device;
a second obtaining unit, configured to obtain a first AF network element and a first network slice identifier, which correspond to the current handover reference information, in the correspondence relationship between the terminal devices; the corresponding relation is the corresponding relation between different switching reference information of the terminal equipment and AF network elements and network slice identifiers;
a sending unit, configured to send a first message to the first AF network element, where the first message includes the first network slice identifier and an identifier of the terminal device, and the first message is used to establish a PDU session between the terminal device and a network slice indicated by the first network slice identifier.
8. The apparatus of claim 7, further comprising: a subscription unit;
the subscription unit is configured to establish a subscription service with a second network element, where the subscription service is used to subscribe to a change of the handover reference information of the terminal device;
the first obtaining unit is specifically configured to receive the current handover reference information from the second network element after the handover reference information of the terminal device changes.
9. The apparatus according to claim 7 or 8,
the second obtaining unit is specifically configured to obtain subscription information of the terminal device from a third network element, where the subscription information includes the correspondence.
10. The apparatus of claim 7 or 8, further comprising:
a determination unit configured to determine that handover reference information of the terminal device changes;
and the processing unit is used for initiating a PDU session release process of the terminal equipment.
11. An apparatus for establishing a PDU session, the apparatus comprising:
a receiving unit, configured to receive a first message from a first network element, where the first message includes a first network slice identifier and an identifier of a terminal device;
and the sending unit is used for sending the first network slice identifier to the terminal equipment, wherein the first network slice identifier is used for indicating the establishment of the PDU session between the terminal equipment and the network slice indicated by the first network slice identifier.
12. The apparatus of claim 11, further comprising:
an obtaining unit, configured to obtain a corresponding relationship of the terminal device, where the corresponding relationship is a corresponding relationship between different handover reference information of the terminal device and an AF network element and a network slice identifier;
and the storage unit is used for storing the corresponding relation in a third network element.
13. A communication network element, wherein the communication network element comprises: one or more processors, and a memory;
the memory is coupled with the one or more processors; the memory for storing computer program code comprising instructions which, when executed by the one or more processors, cause the communication network element to perform the method of any of claims 1-6.
14. A computer-readable storage medium comprising computer instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1-6.
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