CN114095986B - Communication method, device, equipment and storage medium - Google Patents

Communication method, device, equipment and storage medium Download PDF

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Publication number
CN114095986B
CN114095986B CN202111296355.6A CN202111296355A CN114095986B CN 114095986 B CN114095986 B CN 114095986B CN 202111296355 A CN202111296355 A CN 202111296355A CN 114095986 B CN114095986 B CN 114095986B
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Prior art keywords
network slice
target cell
identifier
target
identification
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CN114095986A (en
Inventor
吴琼
任驰
马泽芳
马瑞涛
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China United Network Communications Group Co Ltd
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China United Network Communications Group Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service

Abstract

The invention discloses a communication method, a device, equipment and a storage medium, which relate to the technical field of communication and are used for avoiding session termination and ensuring session continuity when UE performs network switching. Comprising the following steps: the AMF equipment responds to a switching request message of a User Equipment (UE) requesting to access a target cell, and sends a network slicing request message to NSSF equipment under the condition that a user corresponding to the UE is a subscriber of the target cell. The network slice request message is used for requesting to acquire the network slice identifier of the target cell. The AMF equipment receives the network slice identification of the target cell sent by NSSF equipment; and determining the intersection of the network slice identifier of the target cell and the network slice identifier subscribed by the UE as the target network slice identifier. Further, the AMF device sends a target network slice identifier to the UE; the target network slice identity is used to instruct the UE to access the target cell based on the target network slice identity.

Description

Communication method, device, equipment and storage medium
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a communications method, apparatus, device, and storage medium.
Background
In a public land mobile network (Public Land Mobile Network, abbreviated PLMN), user Equipment (UE) signs up for different single network slice selection assistance information (single network slice selection assistance information, S-nsai) for different management protocol data unit (protocol data unit, PDU) sessions. In a Non-independent Non-Public Network (PNI-NPN), also known as a Public Network integrated Non-Public Network (Non-Public Network NPN), a dedicated Network slice is configured for the UE to use, i.e. sign up for a dedicated S-nsai, so as to achieve NPN Network logical isolation.
However, because the logic of the PLMN network and the logic of the NPN network are relatively independent, in the process that the UE switches back and forth between the PLMN network and the NPN network, the UE initiates a switching process by using the S-nsai of the source network, and the target network to be accessed may instruct the S-nsai currently used by the UE to be a network slice managed by the source network, thereby rejecting the UE from accessing, which results in session interruption of the UE and affects user service experience.
Disclosure of Invention
The invention provides a communication method, a device, equipment and a storage medium, which are used for avoiding session termination and ensuring session continuity when UE performs network switching.
In order to achieve the above purpose, the invention adopts the following technical scheme:
in a first aspect, a communication method is provided, the communication method being applied to an AMF device. The AMF equipment responds to a switching request message of a User Equipment (UE) requesting to access a target cell, and sends a network slice request message to NSSF equipment under the condition that a user corresponding to the UE is a subscriber of the target cell, wherein the network slice request message is used for requesting to acquire a network slice identifier of the target cell. The AMF equipment receives a network slice identifier of a target cell sent by NSSF equipment, wherein the network slice identifier of the target cell is an identifier determined by NSSF equipment according to the identifier of the target cell from a mapping relation comprising the cell identifier and the network slice identifier; and determining the intersection of the network slice identifier of the target cell and the network slice identifier subscribed by the UE as the target network slice identifier. Further, the AMF device sends a target network slice identifier to the UE; the target network slice identity is used to instruct the UE to access the target cell based on the target network slice identity.
The invention provides a communication method, a device, equipment and a storage medium.A AMF device responds to a switching request message of a UE (user equipment) requesting to access a target cell, determines whether a user corresponding to the UE is a subscriber of the target cell, and sends a network slice request message to a network slice selection function NSSF device under the condition that the user corresponding to the UE is the subscriber of the target cell, wherein the network slice request message is used for requesting to acquire a network slice identifier of the target cell. After receiving the network slice request message, the NSSF device sends the network slice identifier of the target cell to the AMF device. The AMF equipment determines that the intersection of the network slice identifier of the target cell and the network slice identifier signed by the UE is the target network slice identifier, sends the target network slice identifier to the UE, and the UE accesses the target cell based on the target network slice identifier.
The target cell can be a cell in a PLMN network or a cell in an NPN network, and the method ensures that the UE can modify a network slice used by a PDU session before the UE switches the network no matter the UE moves from the coverage of the PLMN network to the coverage of the NPN network or from the coverage of the NPN network to the coverage of the PLMN network, thereby avoiding the break of the PDU session in progress by the UE due to the network switching, and ensuring the session continuity. In one possible design, the receiving the network slice identifier of the target cell sent by the NSSF device includes: the AMF equipment receives the network slice response message sent by the NSSF equipment, and acquires the network slice identification of the target cell from the network slice response message.
In one possible design, the communication method further includes: the AMF equipment sends a subscription data request message to the Unified Data Management (UDM) equipment; the subscription data request message comprises an identifier of the UE, and is used for requesting to acquire subscription information of the UE and a network slice identifier of the subscribed UE; the subscription information of the UE is used to indicate whether the user corresponding to the UE is a subscriber of the target cell. Further, the AMF device receives the subscription information of the UE and the network slice identifier of the UE subscribed sent by the UDM.
In one possible design, the sending the target network slice identifier to the UE includes: based on the target network slice identifier, AMF equipment generates a switching response message and sends the switching response message to UE; the handover response message includes the target network slice identity.
In a second aspect, the present invention provides a communication method applied to NSSF devices. The NSSF equipment receives a network slice request message sent by the AMF equipment, wherein the network slice request message is a message sent by the AMF equipment in the case that a user corresponding to User Equipment (UE) is a subscriber of a target cell in response to a handover request message of the UE requesting to access the target cell, and the network slice request message comprises an identification of the target cell. According to the identification of the target cell, NSSF equipment determines the network slice identification of the target cell from the mapping relation comprising the cell identification and the network slice identification. Further, the NSSF device sends a network slice identifier of the target cell to the AMF device, so that the AMF device determines an intersection of the network slice identifier of the target cell and the network slice identifier subscribed by the UE as a target network slice identifier based on the network slice identifier of the target cell, and sends the target network slice identifier to the UE, where the target network slice identifier is used to instruct the UE to access the target cell based on the target network slice identifier.
In one possible design, the sending, to the AMF device, the network slice identifier of the target cell includes: based on the network slice identification of the target cell, NSSF equipment generates a network slice response message and sends the network slice response message to AMF equipment; the network slice response message includes the network slice identification of the target cell.
In one possible design, the communication method further includes: the NSSF equipment responds to the received network slice updating message, acquires the network slice identification of the cell to be updated from the network slice updating message, and updates the mapping relation based on the acquired network slice identification of the cell to be updated and the identification of the cell to be updated.
In a third aspect, an AMF device is provided, which comprises a transmitting unit, a receiving unit and a determining unit. The sending unit is used for responding to a switching request message of a User Equipment (UE) requesting to access a target cell, and sending a network slice request message to a Network Slice Selection Function (NSSF) device under the condition that a user corresponding to the UE is a subscriber of the target cell; the network slice request message is used for requesting to acquire the network slice identification of the target cell; the receiving unit is used for receiving the network slice identifier of the target cell sent by NSSF equipment, wherein the network slice identifier of the target cell is an identifier determined by NSSF equipment according to the identifier of the target cell from a mapping relation comprising the cell identifier and the network slice identifier; the determining unit is used for determining the intersection of the network slice identifier of the target cell and the network slice identifier signed by the UE as the target network slice identifier; the sending unit is also used for sending the target network slice identifier to the UE; the target network slice identity is used to instruct the UE to access the target cell based on the target network slice identity.
In one possible design, the receiving unit is specifically configured to receive a network slice response message sent by the NSSF device, and obtain a network slice identifier of the target cell from the network slice response message.
In a possible design, the sending unit is further configured to send a subscription data request message to the unified data management UDM device; the subscription data request message comprises an identifier of the UE, and is used for requesting to acquire subscription information of the UE and a network slice identifier of the subscribed UE; the subscription information of the UE is used for indicating whether the user corresponding to the UE is a subscriber of the target cell; the receiving unit is further configured to receive subscription information of the UE and a network slice identifier of the UE subscribed sent by the UDM.
In one possible design, the sending unit specifically generates a handover response message based on the target network slice identifier, and sends the handover response message to the UE; the handover response message includes the target network slice identity.
In a fourth aspect, an NSSF device is provided, which includes a receiving unit, a determining unit, and a transmitting unit. The receiving unit is used for receiving a network slice request message sent by the AMF equipment, wherein the network slice request message is a message sent by the access management unit AMF equipment in the case that a user corresponding to User Equipment (UE) is a subscriber of a target cell in response to a switching request message of the UE requesting to access the target cell, and the network slice request message comprises an identifier of the target cell; the determining unit is used for determining the network slice identifier of the target cell from the mapping relation comprising the cell identifier and the network slice identifier according to the identifier of the target cell; the sending unit is used for sending the network slice identifier of the target cell to the AMF equipment so that the AMF equipment can determine the intersection of the network slice identifier of the target cell and the network slice identifier signed by the UE as the target network slice identifier based on the network slice identifier of the target cell and send the target network slice identifier to the UE, wherein the target network slice identifier is used for indicating the UE to access the target cell based on the target network slice identifier.
In one possible design, the sending unit is specifically configured to generate a network slice response message based on the network slice identifier of the target cell, and send the network slice response message to the AMF device; the network slice response message includes the network slice identification of the target cell.
In one possible design, the NSSF device further includes an acquiring unit and an updating unit; the acquisition unit is used for responding to the received network slice updating message and acquiring the network slice identification of the cell to be updated from the network slice updating message; the updating unit is used for updating the mapping relation based on the acquired network slice identification of the cell to be updated and the identification of the cell to be updated.
In a fifth aspect, an AMF device is provided, the AMF device comprising a memory and a processor; a memory is coupled to the processor, the memory for storing computer program code comprising computer instructions which, when executed by the processor, cause the AMF device to perform the communication method as in the first aspect.
In a sixth aspect, there is provided an NSSF device comprising a memory and a processor; a memory is coupled to the processor, the memory for storing computer program code comprising computer instructions which, when executed by the processor, cause the NSSF device to perform the communication method as in the second aspect.
In a seventh aspect, a computer readable storage medium is provided, in which instructions are stored which, when run on an AMF device, cause the AMF device to perform a communication method as in the first aspect.
In an eighth aspect, there is provided a computer readable storage medium having instructions stored therein that, when executed on an NSSF device, cause the NSSF device to perform the communication method as in the second aspect.
Drawings
Fig. 1 is a schematic structural diagram of a communication system according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a communication method according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a communication method according to a second embodiment of the present invention;
fig. 4 is a schematic flow chart III of a communication method according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an AMF device according to an embodiment of the invention;
fig. 6 is a schematic structural diagram of NSSF equipment according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an AMF device according to an embodiment of the invention;
fig. 8 is a schematic diagram III of an AMF device according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention.
In embodiments of the invention, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.
In the description of the present invention, "/" means "or" unless otherwise indicated, for example, A/B may mean A or B. "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. Further, "at least one", "a plurality" means two or more. The terms "first," "second," and the like do not limit the number and order of execution, and the terms "first," "second," and the like do not necessarily differ.
In the prior art, due to the logical isolation between the PLMN network and the NPN network, for example, when the UE enters the coverage of the NPN network from the coverage of the PLMN network, the NPN network may indicate to the terminal that the currently used S-NSSAI is a slice managed by the PLMN, which results in the NPN network rejecting the terminal from accessing, thereby resulting in session termination and affecting user service experience.
In order to solve the technical problems, the present invention provides a communication method, apparatus, device and storage medium, where an access management unit (Access Management Function, AMF) device responds to a handover request message that a UE requests to access a target cell, determines whether a user corresponding to the UE is a subscriber of the target cell, and sends a network slice request message to a network slice selection function (Network Slice Selection Function, NSSF) device when the user corresponding to the UE is the subscriber of the target cell, where the network slice request message is used to request to obtain a network slice identifier of the target cell. After receiving the network slice request message, the NSSF device sends the network slice identifier of the target cell to the AMF device. The AMF equipment determines that the intersection of the network slice identifier of the target cell and the network slice identifier signed by the UE is the target network slice identifier, sends the target network slice identifier to the UE, and the UE accesses the target cell based on the target network slice identifier.
The target cell can be a cell in a PLMN network or a cell in an NPN network, and the method ensures that the UE can modify a network slice used by a PDU session before the UE switches the network no matter the UE moves from the coverage of the PLMN network to the coverage of the NPN network or from the coverage of the NPN network to the coverage of the PLMN network, thereby avoiding the break of the PDU session in progress by the UE due to the network switching, and ensuring the session continuity.
An embodiment of the present invention provides a communication system, and referring to fig. 1, the above-mentioned communication method may be applied to the communication system 10 shown in fig. 1. The communication system 10 includes a base station device 11, a UE12, an AMF device 13, a Unified data management (Unified DataManagement, UDM) device 14, and an NSSF device 15 of a radio access network (NGradioaccess network, NG-RAN).
The AMF device 13 is connected to the base station device 11, the UDM device 14, and the NSSF device 15, respectively, and the base station device 11 is connected to the UE12, where the connection relationship may be wired or wireless.
The base station apparatus 11 may be configured to determine a change in the network environment in which the UE12 is located, for example, the base station apparatus 11 may be configured to send a handover message to the UE when determining that the UE12 moves from the source cell to the target cell, to indicate that the UE12 has entered the coverage area of the target cell, and perform network handover.
The UE12 may be configured to, after receiving the handover message sent by the base station device 11, send a handover request message to the AMF device 13, where the handover request message includes the identifier of the target cell and the unique identifier of the UE12 on the AMF device 13 and the access network side.
The AMF device 13 may be configured to send a network slice request message to the NSSF to obtain the network slice identity of the target cell. The AMF device 13 may be further configured to send a subscription data request message to the UDM device 14 to obtain subscription information of the UE12 and a network slice identifier of the UE12 subscribed to. The AMF device 13 determines, according to the subscription information of the UE12, whether the user corresponding to the UE is a subscriber of the target cell, determines that an intersection between the network slice identifier of the target cell and the network slice identifier subscribed by the UE12 is the target network slice identifier, and sends the target network slice identifier to the UE12.
The UDM device 14 may be used for storing and managing subscription data of users.
The NSSF device 15 may be configured to manage a mapping relationship between a cell and a network slice identifier, and after receiving a network slice request message sent by the AMF device 13, query, according to the mapping relationship between the cell and the network slice identifier, the network slice identifier of the target cell and send the network slice identifier to the AMF device 13.
The following describes a communication method provided by an embodiment of the present invention with reference to the accompanying drawings.
As shown in fig. 2, the communication method provided by the embodiment of the present invention is applied to the above communication system, including S201-S207.
S201, AMF equipment receives a switching request message which is sent by UE and requests to access a target cell.
The handover request message includes an identity of the UE, a handover type, and an identity of the target cell. The handover type is used to indicate the identity of the source cell and the identity of the target cell.
As one possible implementation, the UE generates a handover request message and sends the handover request message to the AMF device through the NG-RAN.
Correspondingly, AMF equipment receives a switching request message generated by UE through NG-RAN
It should be noted that, the handover request message is generated after the UE receives the handover indication sent by the NG-RAN to the UE.
Specifically, after determining that the UE moves from the coverage area of the source cell to the coverage area of the target cell, the base station device in the NG-RAN determines that the radio environment of the UE changes. Further, the base station device generates a handover indication and transmits the handover indication to the UE.
The switching indication is used for indicating the UE to be switched from a source cell to a target cell. The handover indication includes an identity of the source cell and an identity of the target cell.
Correspondingly, after receiving the switching instruction, the UE acquires the identification of the source cell and the identification of the target cell from the switching instruction, generates a switching request message according to the identification of the source cell, the identification of the target cell, the identification of the UE in the base station equipment and the identification of the UE in the AMF equipment, and sends the switching request message to the AMF equipment through the base station equipment. In the following, for convenience of description, in the subsequent embodiment of the present invention, the identifier of the UE in the AMF device may be simply referred to as the identifier of the UE, and the communication method provided in the embodiment of the present invention will be described by taking this as an example.
S202, responding to the received switching request message, and generating a network slicing request message by the AMF equipment under the condition that a user corresponding to the UE is a subscriber of a target cell.
The network slice request message includes an identifier of the target cell, and is used for requesting to acquire the network slice identifier of the target cell.
As a possible implementation manner, the AMF device determines whether the user corresponding to the UE is a subscriber of the target cell, and generates the network slicing request message according to the identifier of the source cell, the identifier of the target cell, and the identifier of the UE after determining that the user corresponding to the UE is the subscriber of the target cell.
It should be noted that the network slice request message further includes an identifier of the source cell and an identifier of the UE.
In this step, the specific implementation manner of the AMF device for determining whether the user corresponding to the UE is the subscriber of the target cell may refer to the subsequent description of the embodiment of the present invention, which is not repeated herein.
S203, the AMF device sends a network slice request message to the NSSF device.
For example, the network slice request message may be an nnssf_nssaibinding Get message, where the message includes an identifier of the target cell, and the message is used to instruct the NSSF device to send the network slice identifier of the target cell to the AMF device.
Correspondingly, the NSSF device receives the target network slice request message sent by the AMF device.
And S204, the NSSF equipment determines the network slice identification of the target cell from the mapping relation comprising the cell identification and the network slice identification according to the identification of the target cell.
Wherein the network slice identification of the target cell is an identification of all network slices managed by the target cell.
As a possible implementation manner, NSSF equipment obtains the identifier of the target cell from the received target network slice request message, and queries and determines the network slice identifier of the target cell from the mapping relationship between the cell identifier and the network slice identifier according to the identifier of the target cell.
It should be noted that, a mapping relationship between a cell identifier and a network slice identifier is preset in NSSF equipment. In the operation process, NSSF equipment can update and maintain the mapping relation between the cell identification and the network slice identification.
For a specific implementation manner of the updating maintenance step of the mapping relationship, reference may be made to the following description of the embodiment of the present invention, which is not repeated here.
S205, the NSSF device sends the AMF device the network slice identifier of the target cell.
As one possible implementation, the NSSF device may generate a network slice response message based on the network slice identifier of the target cell, and send the network slice response message to the AMF device;
Wherein the network slice response message includes the network slice identification of the target cell.
Correspondingly, the AMF device receives the network slice identifier of the target cell sent by the NSSF device.
As a possible implementation manner, the AMF device receives the network slice response message sent by the NSSF device, and obtains the network slice identifier of the target cell from the network slice response message.
S206, the AMF equipment determines the intersection of the network slice identifier of the target cell and the network slice identifier subscribed by the UE as the target network slice identifier.
The network slice identifier of the UE, which is signed up, is the identifier of the network slice which is signed up and available in the UDM equipment of the operator; the target network slice identity is used to instruct the UE to access the target cell based on the target network slice identity.
As one possible implementation manner, the AMF device obtains the network slice identifier of the UE subscribed, and determines an intersection of the obtained network slice identifier of the UE subscribed and the network slice identifier of the target cell, as the target network slice identifier.
In some embodiments, the number of the target network slice identifiers may be one or more, which is not limited by the present invention.
In this step, the specific implementation manner of the AMF device to obtain the network slice identifier subscribed by the UE may refer to the subsequent description of the embodiment of the present invention, which is not described herein again.
S207, the AMF equipment sends a target network slice identifier to the UE.
As one possible implementation, the AMF device may generate a handover response message based on the target network slice identity and send the handover response message to the UE through the base station device of the NG-RAN.
Wherein the handover response message includes the target network slice identity.
Correspondingly, after receiving the handover response message sent by the AMF device, the UE acquires the target network slice identifier from the handover response message.
Further, the UE initiates a PDU session modification procedure according to the target network slice identifier, and accesses the target cell based on the modified PDU session.
In one design, in order to determine whether a user corresponding to the UE is a subscriber of the target cell and obtain a network slice identifier of the UE subscribed to, as shown in fig. 3, the communication method provided in the embodiment of the present invention further includes the following steps S301 to S303.
S301, the AMF device sends a subscription data request message to the UDM device.
The subscription data request message comprises an identifier of the UE; the subscription data request message is used for indicating a request for acquiring the subscription data of the UE. The subscription data request message is used for requesting to acquire the subscription information of the UE and the network slice identifier of the subscribed UE; the subscription information of the UE is used for indicating whether the user corresponding to the UE is a subscriber of the target cell;
As one possible implementation, the AMF device generates a subscription data request message based on the identity of the UE, and sends the subscription data request message to the UDM device.
It should be noted that, the UDM stores subscription data of the UE in advance, where the subscription data of the UE includes subscription information of the UE and a network slice identifier of the UE subscribed to.
Correspondingly, the UDM device receives the subscription data request message sent by the AMF device.
S302, the UDM equipment determines subscription information of the UE and network slice identifiers subscribed by the UE based on the identifiers of the UE.
As a possible implementation, the UDM device obtains the identity of the UE from the received subscription data request message. Further, the UDM device queries the subscription data of the UE in the mapping relationship between the UE identifier and the subscription data according to the UE identifier.
The mapping relation between the UE identifier and the subscription data is preset in the UDM device. In the operation process, the UDM device may also update and maintain the mapping relationship between the UE identifier and the subscription data, and the specific update and maintenance implementation process may refer to the prior art, which is not described herein.
S303, the UDM device sends the subscription information of the UE and the network slice identifier of the subscribed UE to the AMF device.
Correspondingly, the AMF equipment receives the subscription information of the UE and the network slice identifier of the subscribed UE, which are sent by the UDM equipment.
Further, the AMF device determines, from the subscription data of the UE, subscription information of the UE and a network slice identifier of the UE subscribed to.
In one design, in order to ensure accuracy of the mapping relationship between the NSSF device including the cell identifier and the network slice identifier, as shown in fig. 4, the method provided by the embodiment of the present invention further includes S401-S402.
S401, NSSF equipment receives a network slice update message sent by network equipment.
The network slice update message is used for indicating NSSF equipment to update the mapping relation comprising the cell identifier and the network slice identifier. The Update identifier comprises Update and Delete, wherein the Update is used for indicating NSSF equipment to execute addition operation on the mapping relation between the corresponding cell identifier and the network slice identifier; the Delete is used to instruct the NSSF device to perform a Delete operation on the mapping relationship between the corresponding cell identifier and the network slice identifier.
As a possible implementation manner, the NSSF device receives the network device and sends a network slice update message, and obtains, from the network slice update message, a cell identifier and a network slice identifier carried in the network slice update message, and a current usage state of the network slice corresponding to the network slice identifier.
It should be noted that the network device may be any Network Function (NF) network element in the 5GC core network.
S402, the NSSF equipment updates the mapping relation between the cell and the network slice identifier.
As a possible implementation manner, the NSSF device updates the mapping relation stored by the NSSF device based on the acquired cell identifier, the network slice identifier and the update identifier.
For example, if the Update identifier in the network slice Update message is Update, and the network slice a is indicated to be added to the cell a, the NSSF device adds the mapping relationship between the cell a identifier and the network slice a identifier in the mapping relationship.
If the update identifier in the network slice update message is Delete, indicating the cell B to Delete the network slice B, the NSSF device deletes the mapping relationship between the cell B identifier and the network slice B identifier in the stored mapping relationship.
The invention provides a communication method, a device, equipment and a storage medium.A AMF device responds to a switching request message of a UE (user equipment) requesting to access a target cell, determines whether a user corresponding to the UE is a subscriber of the target cell, and sends a network slice request message to a network slice selection function NSSF device under the condition that the user corresponding to the UE is the subscriber of the target cell, wherein the network slice request message is used for requesting to acquire a network slice identifier of the target cell. After receiving the network slice request message, the NSSF device sends the network slice identifier of the target cell to the AMF device. The AMF equipment determines that the intersection of the network slice identifier of the target cell and the network slice identifier signed by the UE is the target network slice identifier, sends the target network slice identifier to the UE, and the UE accesses the target cell based on the target network slice identifier.
The target cell can be a cell in a PLMN network or a cell in an NPN network, and the method ensures that the UE can modify a network slice used by a PDU session before the UE switches the network no matter the UE moves from the coverage of the PLMN network to the coverage of the NPN network or from the coverage of the NPN network to the coverage of the PLMN network, thereby avoiding the break of the PDU session in progress by the UE due to the network switching, and ensuring the session continuity. In one possible design, the receiving the network slice identifier of the target cell sent by the NSSF device includes: the AMF equipment receives the network slice response message sent by the NSSF equipment, and acquires the network slice identification of the target cell from the network slice response message.
The foregoing description of the solution provided by the embodiments of the present invention has been mainly presented in terms of a method. To achieve the above functions, it includes corresponding hardware structures and/or software modules that perform the respective functions. Those of skill in the art will readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven 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 embodiment of the invention can divide the functional modules of the user equipment according to the method example, for example, each functional module can be divided corresponding to each function, and two or more functions can be integrated in one processing module. The integrated modules may be implemented in hardware or in software functional modules. Optionally, the division of the modules in the embodiment of the present invention is schematic, which is merely a logic function division, and other division manners may be implemented in practice.
Fig. 5 is a schematic structural diagram of an AMF device according to an embodiment of the invention. The AMF device is used for executing the communication method. As shown in fig. 5, the AMF device 50 includes a transmitting unit 501, a receiving unit 502, and a determining unit 503.
The sending unit 501 is configured to send, in response to a handover request message that the UE requests to access to the target cell, a network slice request message to the NSSF device when a user corresponding to the UE is a subscriber of the target cell. The network slice request message is used for requesting to acquire the network slice identifier of the target cell. For example, as shown in fig. 2, the transmission unit 501 may be used to perform S203.
A receiving unit 502, configured to receive a network slice identifier of a target cell sent by NSSF equipment. The network slice identifier of the target cell is an identifier determined by NSSF equipment according to the identifier of the target cell from a mapping relation comprising the cell identifier and the network slice identifier. For example, as shown in fig. 2, the receiving unit 502 may be used to perform S205.
A determining unit 503, configured to determine an intersection of the network slice identifier of the target cell and the network slice identifier subscribed by the UE as the target network slice identifier. For example, as shown in fig. 2, the determination unit 503 may be used to perform S206.
The sending unit 501 is further configured to send the target network slice identifier to the UE. The target network slice identity is used to instruct the UE to access the target cell based on the target network slice identity. For example, as shown in fig. 2, the transmission unit 501 may be used to perform S207.
Optionally, as shown in fig. 5, the embodiment of the present invention provides that the receiving unit is specifically configured to: and receiving a network slice response message sent by NSSF equipment, and acquiring the network slice identification of the target cell from the network slice response message. For example, as shown in fig. 2, the receiving unit 502 may be used to perform S205.
Optionally, as shown in fig. 5, the sending unit 501 provided in the embodiment of the present invention is further configured to: and sending a subscription data request message to the UDM device. The subscription data request message comprises an identifier of the UE, and is used for requesting to acquire subscription information of the UE and a network slice identifier of the subscribed UE; the subscription information of the UE is used to indicate whether the user corresponding to the UE is a subscriber of the target cell. For example, as shown in fig. 3, the transmission unit 501 may be used to perform S301.
The receiving unit 502 is further configured to receive the subscription information of the UE and the network slice identifier of the UE subscribed sent by the UDM. For example, as shown in fig. 3, the receiving unit 502 may be used to perform S303.
Optionally, as shown in fig. 5, the sending unit 501 provided in the embodiment of the present invention is specifically configured to: based on the target network slice identification, generating a switching response message and sending the switching response message to the UE; the handover response message includes the target network slice identity. For example, as shown in fig. 2, the transmission unit 501 may be used to perform S207.
Fig. 6 is a schematic structural diagram of NSSF equipment 60 according to an embodiment of the present invention. The NSSF device is used to perform the communication method described above. As shown in fig. 6, the NSSF device 60 includes a receiving unit 601, a determining unit 602, and a transmitting unit 603.
A receiving unit 601, configured to receive a network slice request message sent by an AMF device. The network slicing request message is a message sent by the AMF equipment in response to a handover request message of the UE requesting to access the target cell, wherein the user corresponding to the UE is a subscriber of the target cell, and the network slicing request message comprises an identifier of the target cell. For example, as shown in fig. 2, the receiving unit 601 may be used to perform S203.
A determining unit 602, configured to determine, according to the identity of the target cell, the network slice identity of the target cell from the mapping relationship including the cell identity and the network slice identity. For example, as shown in fig. 2, the determination unit 602 may be used to perform S204.
A sending unit 603, configured to send the network slice identifier of the target cell to the AMF device. The AMF equipment determines an intersection of the network slice identifier of the target cell and the network slice identifier signed by the UE as a target network slice identifier based on the network slice identifier of the target cell, and sends the target network slice identifier to the UE, wherein the target network slice identifier is used for indicating the UE to access the target cell based on the target network slice identifier. For example, as shown in fig. 2, the transmission unit 603 may be used to perform S205.
Optionally, as shown in fig. 6, the embodiment of the present invention provides that the sending unit 603 is specifically configured to: generating a network slice response message based on the network slice identifier of the target cell, and sending the network slice response message to the AMF equipment; the network slice response message includes the network slice identification of the target cell. For example, as shown in fig. 2, the transmission unit 603 may be used to perform S205.
Optionally, as shown in fig. 6, the NSSF device 60 provided in the embodiment of the present invention further includes an obtaining unit 604 and an updating unit 605.
An obtaining unit 604, configured to obtain, in response to the received network slice update message, a network slice identifier of the cell to be updated from the network slice update message. For example, as shown in fig. 4, the acquisition unit 604 may be used to perform S401.
The updating unit 605 is configured to update the mapping relationship based on the acquired network slice identifier of the cell to be updated and the identifier of the cell to be updated. For example, as shown in fig. 4, the update unit 605 may be used to perform S402.
In the case of implementing the functions of the integrated modules in the form of hardware, an embodiment of the present invention provides a possible structural schematic diagram of an AMF device. The AMF device is configured to perform the communication method performed by the AMF device in the above embodiment. As shown in fig. 7, the AMF device 70 comprises a processor 701, a memory 702, and a bus 703. The processor 701 and the memory 702 may be connected by a bus 703.
The processor 701 is a control center of the AMF device, and may be one processor or a collective name of a plurality of processing elements. For example, the processor 701 may be a general-purpose central processing unit (central processing unit, CPU), or may be another general-purpose processor. Wherein the general purpose processor may be a microprocessor or any conventional processor or the like.
As one example, processor 701 may include one or more CPUs, such as CPU 0 and CPU 1 shown in fig. 7.
Memory 702 may be, but is not limited to, read-only memory (ROM) or other type of static storage device that can store static information and instructions, random access memory (random access memory, RAM) or other type of dynamic storage device that can store information and instructions, as well as electrically erasable programmable read-only memory (EEPROM), magnetic disk storage or other magnetic storage devices, or 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.
As a possible implementation, the memory 702 may exist separately from the processor 701, and the memory 702 may be connected to the processor 701 through the bus 703 for storing instructions or program code. The processor 701, when calling and executing instructions or program code stored in the memory 702, is capable of implementing the communication method provided by the embodiment of the present invention.
In another possible implementation, the memory 702 may also be integrated with the processor 701.
Bus 703 may be an industry standard architecture (Industry Standard Architecture, ISA) bus, a peripheral component interconnect (Peripheral Component Interconnect, PCI) bus, or an extended industry standard architecture (Extended Industry Standard Architecture, EISA) bus, among others. The bus may be classified as an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in fig. 7, but not only one bus or one type of bus.
It should be noted that the structure shown in fig. 7 does not constitute a limitation of the AMF device 70. In addition to the components shown in fig. 7, the AMF device 70 may include more or fewer components than shown in fig. 7, or may combine certain components, or may have a different arrangement of components.
As an example, in connection with fig. 7, the functions implemented by the transmitting unit 501, the receiving unit 502, and the determining unit 503 in the amf device 50 are the same as those of the processor 701 in fig. 7.
Optionally, as shown in fig. 7, the AMF device provided in the embodiment of the invention may further include a communication interface 704.
Communication interface 704 for connecting with other devices via a communication network. The communication network may be an ethernet, a radio access network, a wireless local area network (wireless local area networks, WLAN), etc. The communication interface 704 may include a receiving unit for receiving data and a transmitting unit for transmitting data.
In one design, the communication interface may also be integrated in the processor in the AMF device provided in the embodiments of the present invention.
Fig. 8 illustrates another hardware structure of the AMF device in the embodiment of the invention. As shown in fig. 8, AMF device 80 may include a processor 801 and a communication interface 802. The processor 801 is coupled to a communication interface 802.
The function of the processor 801 may be as described above with reference to the processor 701. The processor 801 also has a memory function, and can refer to the function of the memory 702.
The communication interface 802 is used to provide data to the processor 801. The communication interface 802 may be an internal interface of the AMF device or an external interface (corresponding to the communication interface 704) of the AMF device.
It should be noted that the structure shown in fig. 8 is not limiting of the AMF device, and the AMF device 80 may include more or less components than those shown in fig. 8, or may combine some components, or may have a different arrangement of components.
Meanwhile, the schematic structural diagram of one hardware of another NSSF device provided in the embodiment of the present invention may refer to the description of the AMF device in fig. 7 or fig. 8, which is not described herein again. Except that the NSSF device includes a processor for performing the steps performed by the NSSF device in the above-described embodiments.
From the above description of embodiments, it will be apparent to those skilled in the art that the foregoing functional unit divisions are merely illustrative for convenience and brevity of description. In practical applications, the above-mentioned function allocation may be performed by different functional units, i.e. the internal structure of the device is divided into different functional units, as needed, to perform all or part of the functions described above. The specific working processes of the above-described systems, devices and units may refer to the corresponding processes in the foregoing method embodiments, which are not described herein.
The embodiment of the invention also provides a computer readable storage medium, wherein the computer readable storage medium stores instructions, when the computer executes the instructions, the computer executes each step in the method flow shown in the method embodiment.
Embodiments of the present invention provide a computer program product comprising instructions which, when run on a computer, cause the computer to perform the communication method of the method embodiments described above.
The computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: electrical connections having one or more wires, portable computer diskette, hard disk. Random access Memory (Random Access Memory, RAM), read-Only Memory (ROM), erasable programmable Read-Only Memory (Erasable Programmable Read Only Memory, EPROM), registers, hard disk, optical fiber, portable compact disc Read-Only Memory (CD-ROM), an optical storage device, a magnetic storage device, or any other form of computer-readable storage medium suitable for use by a person or persons of skill in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an application specific integrated circuit (Application Specific Integrated Circuit, ASIC). In embodiments of the present invention, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
Since the apparatus, the device computer readable storage medium, and the computer program product in the embodiments of the present invention can be applied to the above-mentioned method, the technical effects that can be obtained by the apparatus, the device computer readable storage medium, and the computer program product can also refer to the above-mentioned method embodiments, and the embodiments of the present invention are not described herein again.
The foregoing is merely illustrative of specific embodiments of the present invention, and the scope of the present invention is not limited thereto, but any changes or substitutions within the technical scope of the present invention should be covered by the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (18)

1. A communication method applied to an access management unit AMF device, the method comprising:
receiving a switching request message generated by UE through NG-RAN, wherein the switching request message comprises the identification of the UE, the switching type and the identification of a target cell; the switching type is used for indicating the identification of the source cell and the identification of the target cell; the switching request message is generated after the UE receives a switching instruction sent by the NG-RAN to the UE, the switching instruction is used for indicating the UE to switch from a source cell to a target cell, and the switching instruction comprises the identification of the source cell and the identification of the target cell;
Responding to a switching request message of User Equipment (UE) requesting to access a target cell, and generating a network slicing request message according to the identification of a source cell, the identification of the target cell and the identification of the UE under the condition that a user corresponding to the UE is a subscriber of the target cell; transmitting a network slice request message to a network slice selection function NSSF device, wherein the network slice request message comprises an identification of a target cell;
receiving a network slice identifier of the target cell sent by the NSSF equipment, wherein the network slice identifier of the target cell is an identifier determined by the NSSF equipment according to the identifier of the target cell from a mapping relationship comprising the cell identifier and the network slice identifier;
determining an intersection of the network slice identifier of the target cell and the network slice identifier signed by the UE as a target network slice identifier;
transmitting the target network slice identifier to the UE; the target network slice identifier is used for indicating the UE to access the target cell based on the target network slice identifier.
2. The communication method according to claim 1, wherein the receiving the network slice identifier of the target cell sent by the NSSF device includes:
And receiving a network slice response message sent by the NSSF equipment, and acquiring the network slice identification of the target cell from the network slice response message.
3. The communication method according to claim 1, characterized in that the method further comprises:
sending a subscription data request message to Unified Data Management (UDM) equipment; the subscription data request message comprises an identifier of the UE, and is used for requesting to acquire subscription information of the UE and a network slice identifier of the UE subscribed to; the subscription information of the UE is used for indicating whether the user corresponding to the UE is the subscriber of the target cell;
and receiving the subscription information of the UE and the network slice identifier of the subscribed UE, which are sent by the UDM.
4. A communication method according to any of claims 1-3, wherein said sending the target network slice identity to the UE comprises:
generating a switching response message based on the target network slice identifier, and sending the switching response message to the UE; the handover response message includes the target network slice identity.
5. A method of communication, for application to NSSF devices, the method comprising: receiving a network slicing request message sent by AMF equipment through NG-RAN, wherein the network slicing request message is a message sent by an access management unit AMF equipment in response to a switching request message of User Equipment (UE) requesting to access a target cell under the condition that a user corresponding to the UE is a subscriber of the target cell, and the network slicing request message comprises an identifier of the UE, a switching type and an identifier of the target cell; the switching type is used for indicating the identification of the source cell and the identification of the target cell; the switching request message is generated after the UE receives a switching instruction sent by the NG-RAN to the UE, the switching instruction is used for indicating the UE to switch from a source cell to a target cell, and the switching instruction comprises the identification of the source cell and the identification of the target cell;
Generating a network slicing request message according to the identification of a source cell, the identification of a target cell and the identification of the UE under the condition that the user corresponding to the UE is a subscriber of the target cell;
according to the identification of the target cell, determining the network slice identification of the target cell from the mapping relation comprising the cell identification and the network slice identification;
and sending the network slice identifier of the target cell to the AMF equipment, so that the AMF equipment determines the intersection of the network slice identifier of the target cell and the network slice identifier subscribed by the UE as a target network slice identifier based on the network slice identifier of the target cell, and sends the target network slice identifier to the UE, wherein the target network slice identifier is used for indicating the UE to access the target cell based on the target network slice identifier.
6. The communication method according to claim 5, wherein the sending the network slice identity of the target cell to the AMF device comprises:
generating a network slice response message based on the network slice identifier of the target cell, and sending the network slice response message to the AMF equipment; the network slice response message includes a network slice identification of the target cell.
7. A method of communication according to claim 5 or 6, characterized in that the method further comprises:
and responding to the received network slice updating message, acquiring the network slice identification of the cell to be updated from the network slice updating message, and updating the mapping relation based on the acquired network slice identification of the cell to be updated and the identification of the cell to be updated.
8. An access management unit AMF device is characterized by comprising a sending unit, a receiving unit and a determining unit;
the receiving unit is configured to receive, through the NG-RAN, a handover request message generated by the UE, where the handover request message includes an identifier of the UE, a handover type, and an identifier of a target cell; the switching type is used for indicating the identification of the source cell and the identification of the target cell; the switching request message is generated after the UE receives a switching instruction sent by the NG-RAN to the UE, the switching instruction is used for indicating the UE to switch from a source cell to a target cell, and the switching instruction comprises the identification of the source cell and the identification of the target cell; the sending unit is configured to respond to a handover request message that a user equipment UE requests to access a target cell, and generate a network slice request message according to an identifier of a source cell, an identifier of a target cell, and an identifier of the UE when a user corresponding to the UE is a subscriber of the target cell, and send the network slice request message to a network slice selection function NSSF device, where the network slice request message is used to request to obtain a network slice identifier of the target cell;
The receiving unit is configured to receive a network slice identifier of the target cell sent by the NSSF device, where the network slice identifier of the target cell is an identifier determined by the NSSF device according to the identifier of the target cell from a mapping relationship including a cell identifier and a network slice identifier;
the determining unit is configured to determine an intersection of the network slice identifier of the target cell and the network slice identifier subscribed by the UE as a target network slice identifier;
the sending unit is further configured to send the target network slice identifier to the UE; the target network slice identifier is used for indicating the UE to access the target cell based on the target network slice identifier.
9. The AMF device according to claim 8, wherein said receiving unit is specifically adapted to: and receiving a network slice response message sent by the NSSF equipment, and acquiring the network slice identification of the target cell from the network slice response message.
10. The AMF device according to claim 8, wherein said sending unit is further configured to send a subscription data request message to a unified data management UDM device; the subscription data request message comprises an identifier of the UE, and is used for requesting to acquire subscription information of the UE and a network slice identifier of the UE subscribed to; the subscription information of the UE is used for indicating whether the user corresponding to the UE is the subscriber of the target cell;
The receiving unit is further configured to receive subscription information of the UE and a network slice identifier that the UE has subscribed, which are sent by the UDM.
11. The AMF device according to any one of claims 8-10, characterized in that said transmitting unit is specifically adapted to: generating a switching response message based on the target network slice identifier, and sending the switching response message to the UE; the handover response message includes the target network slice identity.
12. A network slice selection function NSSF device, which is characterized by comprising a receiving unit, a determining unit and a transmitting unit;
the receiving unit is configured to receive, by using an NG-RAN, a network slice request message sent by an AMF device, where the network slice request message is a message sent by an access management unit AMF device in response to a handover request message from a user equipment UE to an access target cell, where the user corresponding to the UE is a subscriber of the target cell, and the network slice request message includes an identifier of the UE, a handover type, and an identifier of the target cell; the switching type is used for indicating the identification of the source cell and the identification of the target cell; the switching request message is generated after the UE receives a switching instruction sent by the NG-RAN to the UE, the switching instruction is used for indicating the UE to switch from a source cell to a target cell, and the switching instruction comprises the identification of the source cell and the identification of the target cell;
Generating a network slicing request message according to the identification of a source cell, the identification of a target cell and the identification of the UE under the condition that the user corresponding to the UE is a subscriber of the target cell; the determining unit is used for determining the network slice identifier of the target cell from the mapping relation comprising the cell identifier and the network slice identifier according to the identifier of the target cell;
the sending unit is configured to send, to the AMF device, a network slice identifier of the target cell, so that the AMF device determines, based on the network slice identifier of the target cell, an intersection of the network slice identifier of the target cell and a network slice identifier subscribed by the UE as a target network slice identifier, and send the target network slice identifier to the UE, where the target network slice identifier is used to instruct the UE to access the target cell based on the target network slice identifier.
13. NSSF device according to claim 12, characterized in that the transmitting unit is specifically configured to: generating a network slice response message based on the network slice identifier of the target cell, and sending the network slice response message to the AMF equipment; the network slice response message includes a network slice identification of the target cell.
14. NSSF device according to claim 12 or 13, characterized in that the NSSF device further comprises an acquisition unit and an update unit;
the acquisition unit is used for responding to the received network slice update message and acquiring the network slice identification of the cell to be updated from the network slice update message;
the updating unit is configured to update the mapping relationship based on the obtained network slice identifier of the cell to be updated and the identifier of the cell to be updated.
15. An access management unit, AMF, device, characterized in that the AMF device comprises a memory and a processor;
the memory is coupled to the processor;
the memory is used for storing computer program codes, and the computer program codes comprise computer instructions;
when the processor executes the computer instructions, the AMF device performs the communication method of any one of claims 1-4.
16. A network slice selection function NSSF device, characterized in that the NSSF device comprises a memory and a processor;
the memory is coupled to the processor;
the memory is used for storing computer program codes, and the computer program codes comprise computer instructions;
When the processor executes the computer instructions, the NSSF device performs the communication method of any of claims 5-7.
17. A computer readable storage medium having instructions stored therein, which, when run on an access management unit, AMF, device is caused to perform the communication method according to any one of claims 1-4.
18. A computer readable storage medium having instructions stored therein, which when run on a network slice selection function NSSF device, cause the NSSF device to perform the communication method of any of claims 5-7.
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