CN116074985A - Connection method and device between DNs (data networks), electronic equipment and storage medium - Google Patents
Connection method and device between DNs (data networks), electronic equipment and storage medium Download PDFInfo
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Abstract
The invention provides a connection method and device between data network DNs, electronic equipment and a computer readable storage medium, and relates to the technical field of communication. The method comprises the following steps: the PCF network element obtains the PDU session corresponding to the UE according to the request message from the AF network element; the PCF network element sends policy control and charging PCC rule information for establishing a user plane tunnel to the SMF network element corresponding to the PDU session, so that the SMF network element controls the establishment of the user plane tunnel between the first UPF network element and the second UPF network element, and the direct connection between DN nodes is realized. At least, the problem that interconnection and interworking between different MEC nodes or different DN nodes cannot be realized under the condition that MEC nodes of user equipment are not changed in the related technology is solved. The method is suitable for the scenes of direct communication between network nodes, direct communication with public network, 5G network element control and the like.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and apparatus for connecting between DNs of a data network, an electronic device, and a computer readable storage medium.
Background
With the deployment of 5G industry-oriented scenarios, user plane functions (User PlaneFunction, UPF) gradually sink to the network edge, and local service offloading to User Equipment (UE) is jointly implemented in combination with edge computing technology (MobileEdge Computing, MEC). As the sinking UPF and MEC nodes become more and more widespread, some industry users have private network business scenarios across campuses/across factory areas, there is a need for interworking between different campuses or the same applications (apps) deployed at different MEC nodes, e.g., content reflow scenarios of CDN (Content Delivery Network ) nodes deployed on different MECs, user context data transmission scenarios between the same apps on different MECs.
In actual deployment, due to investment cost in the early stage of construction and environmental limitation of a part of parks, some MEC nodes or MECs and public networks are not interconnected. To address the interworking requirement, existing schemes trigger the steering of the UE traffic from a first MEC to a second MEC when the UE or application moves. If the UE does not move, i.e. the UE is still active in the first MEC range, but due to the service requirement, the application app needs application data of the UE when the peripheral MEC is active to assist in decision making, at this time, the second MEC needs to transmit data to the first MEC and then transmit the data to the app in the first MEC, and the existing scheme cannot solve the problem of interconnection and interworking.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method, an apparatus, an electronic device and a computer readable storage medium for connecting between DNs of a Data Network, so as to at least solve the problem that interconnection between different MEC nodes or between nodes of different DNs (Data Network) cannot be achieved in the related art under the condition that the MEC node of the user equipment is not changed.
In a first aspect, the present invention provides a method for connecting between DNs of a data network, including: the policy control function PCF network element obtains a protocol data unit PDU session currently corresponding to user equipment UE according to a request message from an application function AF network element, wherein the request message comprises flow description information for establishing a user plane tunnel, and the AF network element is positioned on a first DN; the PCF network element sends policy control and charging PCC rule information for establishing a user plane tunnel to a corresponding session management function SMF network element of the PDU session, so that the SMF network element controls the establishment of the user plane tunnel between a first user plane function UPF network element and a second UPF network element to realize direct connection between DN nodes, wherein the first UPF network element is a UPF network element corresponding to a first DN, and the second UPF network element is a UPF network element corresponding to a second DN.
Preferably, before the policy control function PCF network element obtains the protocol data unit PDU session currently corresponding to the user equipment UE according to the request message from the application function AF network element, the method further includes: and acquiring a second UPF network element identifier.
Preferably, the flow description information includes a second DN identification and a new traffic flow type to be directed.
The obtaining the second UPF network element identifier specifically includes: the PCF network element receives a UDR notification sent by a unified data management UDR network element, where the UDR notification includes a UE identifier, an application identifier, a second DN identifier, a second UPF network element identifier, and a cell parameter for establishing a user plane tunnel. The second UPF network element identifier is that the AF network element sends the request message to the network opening function NEF network element, so that the NEF network element obtains the second UPF network element identifier corresponding to the second DN identifier from the MEC management platform, and the NEF network element sends the second UPF network element identifier and the flow description information to the UDR network element.
Preferably, the PCC rule information for establishing a user plane tunnel includes a first DN identifier, a second DN identifier, an application identifier for triggering establishment of a user plane tunnel, a notification for indicating establishment/deletion of a subscribed user plane tunnel, and a second UPF network element identifier.
In a second aspect, the present invention further provides a method for connecting between DNs of a data network, including: the method comprises the steps that a Session Management Function (SMF) network element receives Policy Control and Charging (PCC) rule information which is sent by a Policy Control Function (PCF) network element and is used for establishing a user plane tunnel, wherein the SMF network element obtains a Protocol Data Unit (PDU) session currently corresponding to User Equipment (UE) according to a request message from an Application Function (AF) network element, the request message comprises flow description information which is used for establishing the user plane tunnel and is determined according to the PDU session, and the AF network element is positioned on a first DN; and the SMF network element controls the establishment of a user plane tunnel between a first user plane function UPF network element and a second UPF network element according to the PCC rule information so as to realize direct connection between DN nodes, wherein the first UPF network element is a UPF network element corresponding to a first DN, and the second UPF network element is a UPF network element corresponding to a second DN.
Preferably, the PCC rule information for establishing a user plane tunnel includes a first DN identifier, a second DN identifier, an application identifier for triggering establishment of a user plane tunnel, a notification for indicating establishment/deletion of a subscribed user plane tunnel, and a second UPF network element identifier.
Preferably, the flow description information includes a second DN identification and a new traffic flow type to be directed. The second UPF network element identifier is from an AF network element to send the request message to a network opening function NEF network element, so that the NEF network element obtains a second UPF network element identifier corresponding to the second DN identifier from a MEC management platform, then the NEF network element sends the second UPF network element identifier and the flow description information to a unified data management UDR network element, and the UDR network element sends a UDR notification to the PCF network element, wherein the UDR notification comprises a UE identifier, an application identifier, a second DN identifier, a second UPF network element identifier and cell parameters for establishing a user plane tunnel.
Preferably, the SMF network element controls to establish a user plane tunnel between the first user plane function UPF network element and the second UPF network element according to PCC rule information, and specifically includes: the SMF network element establishes an N4 session with a second UPF network element, and acquires a second tunnel identifier of the user plane tunnel distributed by the second UPF network element; the SMF network element and the first UPF network element modify the N4 session, control the first UPF network element to distribute a first tunnel identifier of the user plane tunnel, and inform the first UPF network element of the second tunnel identifier; the SMF network element and the second UPF network element modify the N4 session, and inform the second UPF network element of the first tunnel identifier, so that the first UPF network element and the second UPF network element establish a user plane tunnel between DNs for transmitting application data.
Preferably, before the SMF network element establishes an N4 session with the second UPF network element, the method further comprises: and sending a PFCP session establishment request message to the second UPF network element, wherein the PFCP session establishment request message comprises packet detection rules PDR and forwarding rules FAR of two transmission data streams between the second DN and the first DN.
Preferably, after the SMF network element controls establishment of a user plane tunnel between the first user plane function UPF network element and the second UPF network element according to PCC rule information, the method further comprises: receiving a report message sent by a first UPF network element or a second UPF network element in response to the completion of data stream transmission between the first DN and the second DN; and determining whether to delete the user plane tunnel according to the configuration information and the report message.
In a third aspect, the present invention further provides a connection device between DN's of a data network, which is applied to PCF network elements with policy control function, including: the acquisition module is configured to acquire a protocol data unit PDU session currently corresponding to the user equipment UE according to a request message from an application function AF network element, where the request message includes flow description information for establishing a user plane tunnel, and the AF network element is located on the first DN. And the sending module is connected with the acquisition module and is used for sending PCC rule information for establishing a user plane tunnel to the session management function SMF network element corresponding to the PDU session so that the SMF network element controls the establishment of the user plane tunnel between the first user plane function UPF network element and the second UPF network element to realize direct connection between DN nodes, wherein the first UPF network element is a UPF network element corresponding to a first DN, and the second UPF network element is a UPF network element corresponding to a second DN.
In a fourth aspect, the present invention further provides a connection device between data networks DNs, applied to a session management function SMF network element, including: the receiving module is used for receiving PCC rule information for establishing a user plane tunnel sent by a PCF network element, wherein the PCF network element obtains a protocol data unit PDU session currently corresponding to user equipment UE according to a request message from an AF network element, and determines a session management function SMF network element according to the PDU session, the request message comprises flow description information for establishing the user plane tunnel, and the AF network element is positioned on a first DN. And the control module is connected with the receiving module and is used for controlling the establishment of a user plane tunnel between a first user plane function UPF network element and a second UPF network element according to the PCC rule information so as to realize direct connection between DN nodes, wherein the first UPF network element is a UPF network element corresponding to a first DN, and the second UPF network element is a UPF network element corresponding to a second DN.
In a fifth aspect, the present invention also provides an electronic device comprising a memory and a processor, the memory having stored therein a computer program, the processor being arranged to run the computer program to implement the method of connection between data networks DNs according to the first aspect or the method of connection between data networks DNs according to the second aspect.
In a sixth aspect, the present invention further provides a computer readable storage medium, on which a computer program is stored, wherein the computer program, when executed by a processor, implements a method for connecting between data networks DNs according to the first aspect or a method for connecting between data networks DNs according to the second aspect.
The invention provides a method, a device, electronic equipment and a computer readable storage medium for connecting DN nodes of a data network, which are based on a request message initiated by an application function AF network element, a SMF network element is controlled to establish a user plane tunnel between a first user plane function UPF network element and a second UPF network element according to new PCC rule information, and direct connection between DN nodes is realized, wherein the first UPF network element is a UPF network element corresponding to a first DN, and the second UPF network element is a UPF network element corresponding to a second DN. Therefore, the interconnection and intercommunication between different DN/MEC nodes can be realized under the scene that the DN/MEC nodes of the UE and the session anchor points of the PDU (Protocol Data Unit ) are not changed (namely, the UE does not sense the change of the application side).
Drawings
Fig. 1 is a flow chart of a connection method between DNs in embodiment 1 of the present invention;
fig. 2 is a flow chart of a connection method between DNs in embodiment 2 of the present invention;
fig. 3 is a flow chart of a connection method between DNs in embodiment 3 of the present invention;
fig. 4 is a schematic structural diagram of a connection device between DN's of a data network according to embodiment 4 of the present invention;
fig. 5 is a schematic structural diagram of a connection device between DN's of the data network according to embodiment 5 of the present invention;
fig. 6 is a schematic structural diagram of an electronic device according to embodiment 6 of the present invention.
Detailed Description
In order to make the technical scheme of the present invention better understood by those skilled in the art, the following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings.
It is to be understood that the specific embodiments and figures described herein are merely illustrative of the invention, and are not limiting of the invention.
It is to be understood that the various embodiments of the invention and the features of the embodiments may be combined with each other without conflict.
It is to be understood that only the portions relevant to the present invention are shown in the drawings for convenience of description, and the portions irrelevant to the present invention are not shown in the drawings.
It should be understood that each unit and module in the embodiments of the present invention may correspond to only one physical structure, may be formed by a plurality of physical structures, or may be integrated into one physical structure.
It will be appreciated that, without conflict, the functions and steps noted in the flowcharts and block diagrams of the present invention may occur out of the order noted in the figures.
It is to be understood that the flowcharts and block diagrams of the present invention illustrate the architecture, functionality, and operation of possible implementations of systems, apparatuses, devices, methods according to various embodiments of the present invention. Where each block in the flowchart or block diagrams may represent a unit, module, segment, code, or the like, which comprises executable instructions for implementing the specified functions. Moreover, each block or combination of blocks in the block diagrams and flowchart illustrations can be implemented by hardware-based systems that perform the specified functions, or by combinations of hardware and computer instructions.
It should be understood that the units and modules related in the embodiments of the present invention may be implemented by software, or may be implemented by hardware, for example, the units and modules may be located in a processor.
Example 1:
under the condition that DN/MEC nodes and PDU session anchor points of the UE are not changed, the flow of reselecting the MEC nodes and the PDU session anchor points for the UE and inserting the PDU session anchor points into an N9 tunnel can not be triggered, so that the intercommunication requirement between DN/MEC nodes can not be met. In this embodiment, the 5G network relay is used to implement interworking between multiple DN/MEC nodes, and a related trigger message flow and key cell parameters are defined.
As shown in fig. 1, this embodiment provides a connection method between DNs of a data network, which is used to implement interworking of multiple DN nodes, and if the DN is replaced by an MEC, the connection method is used to implement interworking of multiple MEC nodes, and may also be used to implement interworking between DN/MEC nodes and a public network. The connection method between the DNs of the data network comprises the following steps:
In this embodiment, the flow description information includes a second DN identifier and a new service flow type to be guided. For example, the present embodiment defines new traffic flow types trafficFilters (DN 2DN, (IP 1, port1, IP2, port2, transport protocol)) to be directed, and carries DNAI (DN Access Identifier, data network access identifier) of DN2/MEC2 (i.e., shorthand for the second DN/second MEC) at traffic routing rules trafficRoutes. Wherein Dn2Dn refers to Dn, or first Dn to second Dn.
Optionally, before the policy control function PCF network element obtains the protocol data unit PDU session currently corresponding to the user equipment UE according to the request message from the application function AF network element, the method further includes: a second UPF (User Plane Function ) network element identification is obtained.
Specifically, the obtaining the second UPF network element identifier includes: the PCF network element receives a UDR notification sent by a unified data management UDR (Unified Data Repository, unified data warehouse) network element, where the UDR notification includes a UE identifier, an application identifier, a second DN identifier, a second UPF network element identifier, and a cell parameter for establishing a user plane tunnel. The second UPF network element identifier is that the AF network element sends the request message to the network opening function NEF (Network Exposure Function) network element, so that the NEF network element obtains the second UPF network element identifier corresponding to the second DN identifier from the MEC management platform, and the NEF network element sends the second UPF network element identifier and the flow description information to the UDR network element.
In this embodiment, the MEC management platform may be deployed in a network management system or management platform of an operator, or may be deployed independently. The MEC management platform comprises a MEC-UPF mapping module, and the MEC-UPF mapping module is used for storing or maintaining the MEC-UPF mapping relation.
In this embodiment, the PCC rule information for establishing a user plane tunnel includes a first DN identifier, a second DN identifier, an application identifier for triggering establishment of the user plane tunnel, a notification for indicating establishment/deletion of a subscribed user plane tunnel, and a second UPF network element identifier. In this embodiment, a new PCC rule is defined for controlling to establish a Dn2Dn tunnel of the user plane, so as to complete data required for transmitting UE services between DNs/MECs, where the new PCC rule is shown in table 1-1.
TABLE 1-1PCC rule information
The specific process of the SMF network element controlling the establishment of the user plane tunnel between the first user plane function UPF network element and the second UPF network element comprises the following steps: the SMF network element establishes an N4 session with a second UPF network element, and acquires a second tunnel identifier of the user plane tunnel distributed by the second UPF network element; the SMF network element and the first UPF network element modify the N4 session, control the first UPF network element to distribute a first tunnel identifier of the user plane tunnel, and inform the first UPF network element of the second tunnel identifier; the SMF network element and the second UPF network element modify the N4 session, and inform the second UPF network element of the first tunnel identifier, so that the first UPF network element and the second UPF network element establish a user plane tunnel between DNs for transmitting application data.
And N4 is an interface between the SMF and the UPF and is used for transmitting information between the control plane and the user plane, wherein the information comprises forwarding rules, qoS control rules, flow statistics rules and the like which are controlled to face the user plane and information (such as application information, usage monitoring information and the like detected by the user plane) of the user plane. In this embodiment, new cell parameters for establishing a user plane tunnel are defined on the N4 interface. For example, the new value of cell 3GPP Interface Type IE shown in tables 1-2 identifies the tunnel of the Dn2Dn type:
TABLE 1-2 interface cell parameters
The new combined cell Dn2Dn Tunnel Information IE is defined as shown in tables 1-3:
tables 1-3 Combined cell parameters
The new combined cell Dn2Dn Tunnel Report IE is defined in the PFCP Session Report Request message as shown in tables 1-4:
tables 1 to 4Dn2Dn Tunnel Report IE
For another example, a new value of the cell Report Type IE is defined, and the 5 th byte and 8 th bit in the Report Type IE are set as DnD tunnel flag bits (DnD).
According to the connection method between DNs of the data network, based on the request message initiated by the AF network element of the application function, the SMF network element controls the establishment of a user plane tunnel between the UPF network element of the first user plane function and the UPF network element of the second user plane function according to the new PCC rule information, so that the direct connection between DNs is realized, wherein the first UPF network element is the UPF network element corresponding to the first DN, and the second UPF network element is the UPF network element corresponding to the second DN. Therefore, the interconnection and intercommunication between different DN/MEC nodes can be realized under the scene that the DN/MEC nodes of the UE and the PDU session anchor point are not changed (namely, the UE does not sense the change of the application side). Further, by defining a new user plane tunnel type, new PCC rule information and new cell parameters, the SMF network element control efficiency of establishing the user plane tunnels between different UPF network elements is higher, so that the high efficiency and the data transmission stability of content/context traffic forwarding at the DN/MEC application side are ensured.
Example 2:
as shown in fig. 2, this embodiment provides a connection method between DNs of a data network, which is used to implement interworking of multiple DN nodes, and if the DN is replaced by an MEC, the connection method is used to implement interworking of multiple MEC nodes, and may also be used to implement interworking between DN/MEC nodes and a public network. The connection method between the DNs of the data network comprises the following steps:
Optionally, the PCC rule information for establishing a user plane tunnel includes a first DN identifier, a second DN identifier, an application identifier for triggering establishment of the user plane tunnel, a notification for indicating establishment/deletion of a subscribed user plane tunnel, and a second UPF network element identifier.
Optionally, the flow description information includes a second DN identification and a new traffic flow type to be directed. The second UPF network element identifier is from an AF network element to send the request message to a network opening function NEF network element, so that the NEF network element obtains a second UPF network element identifier corresponding to the second DN identifier from a MEC management platform, then the NEF network element sends the second UPF network element identifier and the flow description information to a unified data management UDR network element, and the UDR network element sends a UDR notification to the PCF network element, wherein the UDR notification comprises a UE identifier, an application identifier, a second DN identifier, a second UPF network element identifier and cell parameters for establishing a user plane tunnel.
Optionally, the SMF network element controls, according to PCC rule information, establishment of a user plane tunnel between a first user plane function UPF network element and a second UPF network element, and specifically includes: the SMF network element establishes an N4 session with a second UPF network element, and acquires a second tunnel identifier of the user plane tunnel distributed by the second UPF network element; the SMF network element and the first UPF network element modify the N4 session, control the first UPF network element to distribute a first tunnel identifier of the user plane tunnel, and inform the first UPF network element of the second tunnel identifier; the SMF network element and the second UPF network element modify the N4 session, and inform the second UPF network element of the first tunnel identifier, so that the first UPF network element and the second UPF network element establish a user plane tunnel between DNs for transmitting application data.
Optionally, before the SMF network element establishes an N4 session with the second UPF network element, the method further comprises: and sending a PFCP session establishment request message to the second UPF network element, wherein the PFCP session establishment request message includes packet detection rules PDR (Packet Detection Rule) and forwarding rules FAR (Forward Action Rule) of two transport data flows between the second DN and the first DN.
Optionally, after the SMF network element controls to establish a user plane tunnel between the first user plane function UPF network element and the second UPF network element according to PCC rule information, the method further includes: receiving a report message sent by a first UPF network element or a second UPF network element in response to the completion of data stream transmission between the first DN and the second DN; and determining whether to delete the user plane tunnel according to the configuration information and the report message.
According to the connection method between DNs of the data network, based on the request message initiated by the AF network element of the application function, the SMF network element controls the establishment of a user plane tunnel between the UPF network element of the first user plane function and the UPF network element of the second user plane function according to the new PCC rule information, so that the direct connection between DNs is realized, wherein the first UPF network element is the UPF network element corresponding to the first DN, and the second UPF network element is the UPF network element corresponding to the second DN. Therefore, the interconnection and intercommunication between different DN/MEC nodes can be realized under the scene that the DN/MEC nodes of the UE and the PDU session anchor point are not changed (namely, the UE does not sense the change of the application side). Further, by defining a new user plane tunnel type, new PCC rule information and new cell parameters, the SMF network element control efficiency of establishing the user plane tunnels between different UPF network elements is higher, so that the high efficiency and the data transmission stability of content/context traffic forwarding at the DN/MEC application side are ensured.
Example 3:
the SMF and UPF1 establish PDU session of UE, access AF on DN1, when detecting that application deployed in 2 DN/MEC needs intercommunication to transfer information, receive request of UE to trigger request of establishing DN2DN type tunnel between user plane by application function AF in DN/MEC node, and use for transferring information between two DN/MEC nodes. As shown in fig. 3, the present embodiment provides a connection method between DNs of data networks, which is applied to a 5G network, and the method includes:
S1-S2, AF initiates a request, requests to establish DN2DN type user plane tunnel relay DN/MEC side information, calls Nnef_ TrafficInfluence service service to carry flow description information in trafficFilters parameters, and comprises information such as identification, application identification, UE identification, IP quintuple and the like of a source MEC (hereinafter described by MEC 2) and a destination MEC (hereinafter described by MEC 1);
s3, after receiving the request sent by the AF, the NEF sends the request of the AF to an MEC management platform, deployment information (namely, corresponding relation of MEC-UPF) of each MEC node in the network is maintained in the MEC management platform, UPF nodes UPF2 which are correspondingly deployed are inquired according to MEC2 identifiers carried in the AF request, and the MEC management platform returns an inquiry result (namely, UPF2 identifiers) to the UDR;
s4, the NEF sends UE and flow description information related to the AF request to the UDR;
s5, after receiving the AF request related information, the UDR stores the UPF2 identification inquired in the step S3;
S6-S7, the UDR sends Nudr_DM_Notify notice to the PCF subscribing with the AF request modification, wherein the notice carries relevant information such as UE, APP (application identifier), MEC2, UPF2, dn2dn tunnel and the like; after finding out the corresponding PDU session according to the UE information, the PCF invokes the Npcf_SMPolicyControl_UpdateNotify service and issues PCC rule information to the corresponding SMF of the PDU session;
s8, after the SMF receives the PCC rule information, an N4 session is established with UPF2, and a TEID2 (namely a second tunnel identifier) of a Dn2Dn tunnel distributed by UPF2 is obtained, wherein the cell parameters which are specifically required to be contained are as follows:
the PFCP Session Create Request message issued to UPF2 contains PDR and FAR rules for two streams, DN2- > DN1 and DN1- > DN2, respectively, and the cell parameters to be contained are specifically referred to in step S9, where:
the PDR and FAR rules of DN2- > DN1 on UPF2 are similar to the rules of DN1- > DN2 issued up and down by UPF 1;
the PDR and FAR rules for DN1- > DN2 on UPF2 are similar to those for DN2- > DN1 issued up-and-down on UPF 1.
S9, the SMF and UPF1 initiate an N4 session modification message, the UPF1 is required to allocate the TEID1 of the Dn2Dn tunnel (namely a first tunnel identifier), and the UPF2 allocated TEID2 is informed to the UPF1 in the PDR and the FAR, and the specific cell parameters to be included are as follows:
the PFCP Session Modification Request message issued to UPF1 contains table 3-1:
table 3-1PFCP Session Modification Request message parameters
Taking PDR and FAR rules for DN2- > DN1 as an example, the description of defined cell parameters is made:
wherein, the PDR IE is as shown in Table 3-2:
TABLE 3-2Create PDR IE
The PDR rule for DN1- > DN2 does not include Outer Header Removal IE, and the associated FAR ID is a FAR rule for DN1- > DN 2.
Wherein the PDI IE as shown in tables 3-3 comprises:
TABLE 3-3PDI IE
It should be noted that, the PDI IE uses a newly defined combined cell to indicate that the Dn2Dn type tunnel is established, and is used for controlling the establishment of the Dn2Dn tunnel, which can improve the efficiency of establishing the user plane tunnel and the stability of data transmission, and can transmit the application data of the UE between MEC/DNs, so as to better assist the application app on the MEC to serve and make a decision for the UE. For the PDR rule DN1- > DN2, DN2Dn Tunnel Information IE is not included, application ID IE and SDF Filter IE are included, where the SDF Filter IE includes: traffic flow destination IP information (shall be destination IP address in DN 2).
Wherein the Create FAR IE is as shown in tables 3-4:
TABLE 3-4Create FAR IE
Wherein Forwarding Parameters IE in FAR as shown in tables 3-5:
tables 3-5Forwarding Parameters IE in FA
Description: for DN1- > DN2, destination Interface IE should be a DN2DN tunnel ID allocated to UPF1, and should also contain Outer Header Creation IE, which is used to instruct the data packet received by UPF1 from DN1 and needing to be forwarded to the DN2DN tunnel to add a GTPU packet header, and contain the DN2DN tunnel ID allocated to the opposite end UPF 2.
S10, SMF and UPF2 initiate N4 session modification information, and the Dn2Dn tunnel TEID1 distributed by UPF1 is informed to UPF2;
s11, finishing establishment of a Dn2Dn tunnel between UPF1 and UPF2, and starting transmission of application data between DN/MEC;
s12, after the data transmission is completed (for example, when the UPF1 detects that there is no data transmission in the tunnel for a period of time), the UPF1 initiates a report message to the SMF, and reports that the application transmission data is completed, and then the control plane may decide whether to delete the tunnel according to the configuration. The cell parameters that the message should contain at PFCP Session Report Request are shown in tables 3-6.
Tables 3-6PFCP Session Report Request cell parameters
Meanwhile, the 5 th byte and 8 th bit in the Report Type IE is set as a DnD tunnel flag bit (DnD), and when dnd=1, reporting is indicated as a DnD tunnel.
The connection method between DNs of the data network in this embodiment defines a new user plane tunnel type for forwarding content/context traffic at the application side of DNs/MECs, defines new cell parameters for controlling establishment of user plane tunnels, defines establishment of user plane tunnels and reported messages and flows, and can implement interconnection and interworking between different DNs or MECs. In addition, the connection method of the embodiment can be popularized and applied to the scene that I-SMF and I-UPF exist, namely, a plurality of UPFs possibly exist on the original access link of the UE under roaming, and tunnel connection with the UPF of MEC2 is only established on the last UPF of the access link so as to be used for transmitting the application data of the UE.
Example 4:
as shown in fig. 4, this embodiment provides a connection device between DN of a data network, which is applied to PCF network elements with policy control function, including:
the obtaining module 41 is configured to obtain a protocol data unit PDU session currently corresponding to the user equipment UE according to a request message from an application function AF network element, where the request message includes flow description information for establishing a user plane tunnel, and the AF network element is located on the first DN.
And the sending module 42 is connected with the obtaining module 41, and is configured to send PCC rule information for establishing a user plane tunnel to a session management function SMF network element corresponding to the PDU session, so that the SMF network element controls to establish the user plane tunnel between a first user plane function UPF network element and a second UPF network element, and direct connection between DN nodes is implemented, where the first UPF network element is a UPF network element corresponding to a first DN, and the second UPF network element is a UPF network element corresponding to a second DN.
Optionally, the connection device further comprises an acquisition unit. The acquisition unit is connected with the acquisition module and used for acquiring the second UPF network element identification.
The flow description information comprises a second DN identification and a new service flow type to be guided.
Optionally, the acquiring unit is configured to receive a UDR notification sent by the unified data management UDR network element, where the UDR notification includes a UE identifier, an application identifier, a second DN identifier, a second UPF network element identifier, and a cell parameter used to establish a user plane tunnel.
The second UPF network element identifier is that the AF network element sends the request message to the network opening function NEF network element, so that the NEF network element obtains the second UPF network element identifier corresponding to the second DN identifier from the MEC management platform, and the NEF network element sends the second UPF network element identifier and the flow description information to the UDR network element.
Optionally, the PCC rule information for establishing a user plane tunnel includes a first DN identifier, a second DN identifier, an application identifier for triggering establishment of the user plane tunnel, a notification for indicating establishment/deletion of a subscribed user plane tunnel, and a second UPF network element identifier.
Example 5:
as shown in fig. 5, this embodiment provides a connection device between data networks DNs, which is applied to a session management function SMF network element, and includes:
a receiving module 51, configured to receive PCC rule information for establishing a user plane tunnel sent by a PCF network element of a policy control function, where the PCF network element obtains a protocol data unit PDU session currently corresponding to a user equipment UE according to a request message from an AF network element of an application function, and determines a session management function SMF network element according to the PDU session, where the request message includes flow description information for establishing the user plane tunnel, and the AF network element is located on a first DN.
And the control module 52 is connected with the receiving module 51, and is configured to control, according to the PCC rule information, establishment of a user plane tunnel between a first user plane function UPF network element and a second UPF network element, so as to implement direct connection between DN nodes, where the first UPF network element is a UPF network element corresponding to a first DN, and the second UPF network element is a UPF network element corresponding to a second DN.
Optionally, the PCC rule information for establishing a user plane tunnel includes a first DN identifier, a second DN identifier, an application identifier for triggering establishment of the user plane tunnel, a notification indicating establishment/deletion of a subscribed user plane tunnel, and a second UPF network element identifier.
The flow description information comprises a second DN identification and a new service flow type to be guided. The second UPF network element identifier is from an AF network element to send the request message to a network opening function NEF network element, so that the NEF network element obtains a second UPF network element identifier corresponding to the second DN identifier from a MEC management platform, then the NEF network element sends the second UPF network element identifier and the flow description information to a unified data management UDR network element, and the UDR network element sends a UDR notification to the PCF network element, wherein the UDR notification comprises a UE identifier, an application identifier, a second DN identifier, a second UPF network element identifier and cell parameters for establishing a user plane tunnel.
Optionally, the control module is specifically configured to establish an N4 session with a second UPF network element, obtain a second tunnel identifier of a user plane tunnel allocated by the second UPF network element, and modify the N4 session with the first UPF network element, control the first UPF network element to allocate a first tunnel identifier of the user plane tunnel, inform the first UPF network element of the second tunnel identifier, and inform the second UPF network element of the first tunnel identifier, so that the first UPF network element and the second UPF network element establish a user plane tunnel between DNs for transmitting application data.
Optionally, the control module is further configured to send a PFCP session establishment request message to the second UPF network element, where the PFCP session establishment request message includes a packet detection rule PDR and a forwarding rule FAR of two transport data flows between the second DN and the first DN.
Optionally, the connection device further comprises a determination module.
The determining module is used for receiving a report message sent by the first UPF network element or the second UPF network element in response to the completion of data stream transmission between the first DN and the second DN;
and determining whether to delete the user plane tunnel according to the configuration information and the report message.
Example 6:
as shown in fig. 6, the present embodiment provides an electronic device, including a memory 61 and a processor 62, where the memory 61 stores a computer program, and the processor 62 is configured to run the computer program to implement the connection method between the data networks DN as described in embodiment 1 or embodiment 2.
Example 7:
the present embodiment provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the connection method between data networks DNs as described in embodiment 1 or embodiment 2.
In summary, according to the method, the device, the electronic equipment and the computer readable storage medium for connecting the DN nodes of the data network provided by the embodiments of the present invention, based on the request message initiated by the application function AF network element, the SMF network element controls to establish a user plane tunnel between the first user plane function UPF network element and the second UPF network element according to the new PCC rule information, so as to implement direct connection between the DN nodes, where the first UPF network element is a UPF network element corresponding to the first DN, and the second UPF network element is a UPF network element corresponding to the second DN. Therefore, the interconnection and intercommunication between different DN/MEC nodes can be realized under the scene that the DN/MEC nodes of the UE and the PDU session anchor point are not changed (namely, the UE does not sense the change of the application side). Further, by defining a new user plane tunnel type, new PCC rule information and new cell parameters, the SMF network element control efficiency of establishing the user plane tunnels between different UPF network elements is higher, so that the high efficiency and the data transmission stability of content/context traffic forwarding at the DN/MEC application side are ensured.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.
Claims (14)
1. A method for connecting between DNs of a data network, comprising:
the policy control function PCF network element obtains a protocol data unit PDU session currently corresponding to user equipment UE according to a request message from an application function AF network element, wherein the request message comprises flow description information for establishing a user plane tunnel, and the AF network element is positioned on a first DN;
the PCF network element sends policy control and charging PCC rule information for establishing a user plane tunnel to a corresponding session management function SMF network element of the PDU session, so that the SMF network element controls the establishment of the user plane tunnel between a first user plane function UPF network element and a second UPF network element to realize direct connection between DN nodes, wherein the first UPF network element is a UPF network element corresponding to a first DN, and the second UPF network element is a UPF network element corresponding to a second DN.
2. The method according to claim 1, wherein before the policy control function PCF network element obtains the protocol data unit PDU session currently corresponding to the user equipment UE according to the request message from the application function AF network element, further comprising:
and acquiring a second UPF network element identifier.
3. The method of claim 2, wherein the flow description information includes a second DN identification and a new traffic flow type to be directed,
the obtaining the second UPF network element identifier specifically includes:
the PCF network element receives a UDR notification sent by a unified data management UDR network element, wherein the UDR notification includes a UE identifier, an application identifier, a second DN identifier, a second UPF network element identifier, and a cell parameter for establishing a user plane tunnel,
the second UPF network element identifier is that the AF network element sends the request message to the network opening function NEF network element, so that the NEF network element obtains the second UPF network element identifier corresponding to the second DN identifier from the MEC management platform, and the NEF network element sends the second UPF network element identifier and the flow description information to the UDR network element.
4. The method of claim 1, wherein the PCC rule information for establishing a user plane tunnel comprises a first DN identity, a second DN identity, an application identity triggering establishment of a user plane tunnel, a notification indicating subscription user plane tunnel establishment/deletion, and a second UPF network element identity.
5. A method for connecting between DNs of a data network, comprising:
the method comprises the steps that a Session Management Function (SMF) network element receives Policy Control and Charging (PCC) rule information which is sent by a Policy Control Function (PCF) network element and is used for establishing a user plane tunnel, wherein the SMF network element obtains a Protocol Data Unit (PDU) session currently corresponding to User Equipment (UE) according to a request message from an Application Function (AF) network element, the request message comprises flow description information which is used for establishing the user plane tunnel and is determined according to the PDU session, and the AF network element is positioned on a first DN;
and the SMF network element controls the establishment of a user plane tunnel between a first user plane function UPF network element and a second UPF network element according to the PCC rule information so as to realize direct connection between DN nodes, wherein the first UPF network element is a UPF network element corresponding to a first DN, and the second UPF network element is a UPF network element corresponding to a second DN.
6. The method of claim 5, wherein the PCC rule information for establishing a user plane tunnel comprises a first DN identity, a second DN identity, an application identity triggering establishment of a user plane tunnel, a notification indicating subscription user plane tunnel establishment/deletion, and a second UPF network element identity.
7. The method of claim 6, wherein the flow description information includes a second DN identification and a new traffic flow type to be directed,
the second UPF network element identifier is from an AF network element to send the request message to a network opening function NEF network element, so that the NEF network element obtains a second UPF network element identifier corresponding to the second DN identifier from a MEC management platform, then the NEF network element sends the second UPF network element identifier and the flow description information to a unified data management UDR network element, and the UDR network element sends a UDR notification to the PCF network element, wherein the UDR notification comprises a UE identifier, an application identifier, a second DN identifier, a second UPF network element identifier and cell parameters for establishing a user plane tunnel.
8. The method of claim 5, wherein the SMF network element controls establishment of a user plane tunnel between the first user plane function UPF network element and the second UPF network element according to PCC rule information, specifically comprising:
the SMF network element establishes an N4 session with a second UPF network element, and acquires a second tunnel identifier of the user plane tunnel distributed by the second UPF network element;
the SMF network element and the first UPF network element modify the N4 session, control the first UPF network element to distribute a first tunnel identifier of the user plane tunnel, and inform the first UPF network element of the second tunnel identifier;
the SMF network element and the second UPF network element modify the N4 session, and inform the second UPF network element of the first tunnel identifier, so that the first UPF network element and the second UPF network element establish a user plane tunnel between DNs for transmitting application data.
9. The method of claim 8, further comprising, prior to the SMF network element establishing an N4 session with a second UPF network element:
and sending a PFCP session establishment request message to the second UPF network element, wherein the PFCP session establishment request message comprises packet detection rules PDR and forwarding rules FAR of two transmission data streams between the second DN and the first DN.
10. The method of claim 8, further comprising, after the SMF network element controls establishment of a user plane tunnel between a first user plane function UPF network element and a second UPF network element according to PCC rule information:
receiving a report message sent by a first UPF network element or a second UPF network element in response to the completion of data stream transmission between the first DN and the second DN;
and determining whether to delete the user plane tunnel according to the configuration information and the report message.
11. A connection device between data networks DNs, applied to a PCF network element with a policy control function, comprising:
an acquisition module, configured to acquire a protocol data unit PDU session currently corresponding to a user equipment UE according to a request message from an application function AF network element, where the request message includes flow description information for establishing a user plane tunnel, the AF network element is located on a first DN,
and the sending module is connected with the acquisition module and is used for sending PCC rule information for establishing a user plane tunnel to the session management function SMF network element corresponding to the PDU session so that the SMF network element controls the establishment of the user plane tunnel between the first user plane function UPF network element and the second UPF network element to realize direct connection between DN nodes, wherein the first UPF network element is a UPF network element corresponding to a first DN, and the second UPF network element is a UPF network element corresponding to a second DN.
12. A connection device between data networks DNs, applied to a session management function SMF network element, comprising:
a receiving module, configured to receive PCC rule information for establishing a user plane tunnel sent by a PCF network element of a policy control function, where the PCF network element obtains a protocol data unit PDU session currently corresponding to a user equipment UE according to a request message from an AF network element of an application function, and determines a session management function SMF network element according to the PDU session, where the request message includes flow description information for establishing the user plane tunnel, the AF network element is located on a first DN,
and the control module is connected with the receiving module and is used for controlling the establishment of a user plane tunnel between a first user plane function UPF network element and a second UPF network element according to the PCC rule information so as to realize direct connection between DN nodes, wherein the first UPF network element is a UPF network element corresponding to a first DN, and the second UPF network element is a UPF network element corresponding to a second DN.
13. An electronic device comprising a memory and a processor, the memory having stored therein a computer program, the processor being arranged to run the computer program to implement the method of connecting between data networks DNs according to any of claims 1-4 or the method of connecting between data networks DNs according to any of claims 5-10.
14. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements a method of connecting between data networks DNs according to any of claims 1-4 or a method of connecting between data networks DNs according to any of claims 5-10.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117098188A (en) * | 2023-08-11 | 2023-11-21 | 武汉博易讯信息科技有限公司 | Method and system for user plane data association backfilling through N4 flow |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117098188A (en) * | 2023-08-11 | 2023-11-21 | 武汉博易讯信息科技有限公司 | Method and system for user plane data association backfilling through N4 flow |
| CN117098188B (en) * | 2023-08-11 | 2024-03-12 | 武汉博易讯信息科技有限公司 | Method and system for user plane data association backfilling through N4 flow |
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