A method, device, computer equipment and storage medium for building and discovering a network bridge

Abstract

The present application provides a bridge construction and discovery method, apparatus, computer equipment, and storage medium, which can pre-configure different network modes in a UPF node. Under different network modes, the protocol stack composition of the UPF node is different. When the terminal device sends a PDU session establishment request, it can carry first indication information indicating the mode type of the TSN bridge to be built. In this way, the TSN bridge can be constructed and discovered under the target network mode corresponding to the first indication information. Since the same UPF node can be configured with multiple network modes, a corresponding TSN bridge can be constructed under each network mode. Therefore, based on this method, multiple TSN bridges can be carried by one UPF node; in addition, since the protocol stack composition of the UPF node under different network modes is different, the 5G TSN bridge constructed based on the method provided by this application can support heterogeneous networking of diverse constellation protocol systems.

Description

Technical Field

[0001] The present application relates to the field of communications, and more specifically to a method, apparatus, computer device, and storage medium for building and discovering a network bridge. Background Art

[0002] With the development of fifth-generation mobile communication technology (5G), data transmission accuracy and efficiency have significantly improved. Leveraging 5G's wireless communication capabilities, 5G Time Sensitive Networking (TSN) bridges overcome the limitations of traditional wired networks, enabling broader network coverage and more flexible network deployment. These bridges play a vital role in the deployment of industrial internet campus networks and 5G industrial private networks. Summary of the Invention

[0003] In view of this, the present application provides a bridge construction and discovery method, apparatus, computer equipment and storage medium.

[0004] Specifically, this application adopts the following technical solutions:

[0005] The present application provides a method for building and discovering a network bridge, which is applied to a session management function (SMF) node. The method includes:

[0006] Receiving a packet data unit (PDU) session establishment request sent by a terminal device, wherein the PDU session establishment request carries first indication information, where the first indication information is used to indicate a modality type of a time-sensitive network (TSN) bridge to be established; under different network modes, the protocol stack composition of the user plane function (UPF) node is different;

[0007] Obtain bridge information that matches the target network modality under the modality type, and construct and discover a TSN bridge based on the bridge information; wherein the bridge information includes the identifier of the UPF instance that carries the target network modality, and different UPF instances are used to carry TSN bridges under different network modalities.

[0008] Optionally, the SMF node includes pre-configured first network modality information of the UPF node in each network modality, and second network modality information of the data network DN node in each network modality;

[0009] The method further includes determining the target network modality according to the following method:

[0010] In a case where the PDU session establishment request carries the address of the DN node, determining the network modality of the DN node based on the address of the DN node, and determining the target network modality based on the network modality of the DN node and the correspondence between the first network modality information and the second network modality information;

[0011] When the address of the DN node is not carried in the PDU session establishment request, the network mode of the DN node is determined based on the pre-configured second network mode information, the mode type and the service type of the terminal device, and the target network mode is determined based on the network mode of the DN node and the corresponding relationship.

[0012] Optionally, the network modality information includes a network modality identifier;

[0013] After determining the target network modality, the method further includes:

[0014] Sending a session policy creation request carrying a target network modality identifier of the target network modality to a policy control function (PCF) node;

[0015] Receive a policy control request trigger condition sent by the PCF node, where the policy control request trigger condition includes a target trigger condition instructing the SMF node to report the bridge information under the target network mode to the PCF node.

[0016] Optionally, the PDU session establishment request further carries a media access control address MAC address of the DS-TT deployed by the terminal device;

[0017] Discovering a TSN bridge based on the bridge information includes:

[0018] After obtaining the bridge information matching the target network modality, in response to the target trigger condition being triggered, the bridge information and the MAC address of the DS-TT are sent to the PCF node to instruct the PCF to report the bridge information and the MAC address of the DS-TT to the TSN application function network element AF.

[0019] Optionally, acquiring bridge information matching the target network modality includes:

[0020] Sending a Packet Forwarding Control Protocol (PFCP) session establishment request carrying a network modality identifier of the network modality of the DN node to the UPF node;

[0021] Receive a PFCP session establishment response sent by the UPF node and carrying the bridge information.

[0022] Optionally, the bridge information further includes:

[0023] The terminal side time-sensitive network converter DS-TT port number, network side time-sensitive network converter NW-TT port number, and TSN bridge identifier allocated by the UPF node;

[0024] The constructing of the TSN bridge based on the bridge information includes:

[0025] Send the DS-TT port number to the terminal device.

[0026] The present application also provides a method for establishing and discovering a network bridge, which is applied to a terminal device and includes:

[0027] Send a PDU session establishment request to the SMF node, wherein the PDU session establishment request carries first indication information, and the first indication information is used to indicate the target network mode of the time-sensitive network TSN bridge to be built corresponding to the terminal device. Under different network modes, the protocol stack structure of the user plane function UPF node is different;

[0028] Receive the DS-TT port number sent by the SMF node.

[0029] The present application also provides a bridge construction and discovery method, which is applied to a PCF node and includes:

[0030] Receive a session policy creation request sent by an SMF node; wherein the session policy creation request carries a target network modality identifier of a target network modality of a UPF node, the UPF node is pre-configured with multiple network modalities, and under different network modalities, the protocol stack composition of the UPF node is different;

[0031] Sending a policy control request trigger condition to the SMF node, wherein the policy creation request trigger condition includes a target trigger condition instructing the SMF node to report the bridge information under the target network modality to the PCF node;

[0032] Receive the target bridge information sent by the SMF node after the target trigger condition is triggered, and discover the TSN bridge based on the target bridge information; wherein, the target bridge information includes the bridge information allocated by the UPF node and the MAC address of the DS-TT sent by the terminal device to the SMF node.

[0033] Optionally, the discovering a TSN bridge based on the target bridge information includes:

[0034] Reporting the target bridge information and the target network modality identifier corresponding to the target bridge information to the TSN-AF node;

[0035] Create an AF session associated with the TSN bridge in the target network mode, and subscribe to TSN events on the AF session;

[0036] Determine the transmission delay information of the TSN bridge under the target network mode, and report the transmission delay information to the TSN-AF node.

[0037] The present application also provides a bridge construction and discovery method, which is applied to a UPF node. The UPF node is pre-configured with multiple network modes. Under different network modes, the protocol stack structure of the UPF node is different. The method includes:

[0038] Receiving a packet forwarding control protocol PFCP session establishment request sent by an SMF node and carrying a network modality identifier of the network modality of the DN node;

[0039] Determining a target network modality of the UPF node corresponding to the network modality of the DN node;

[0040] Determine the bridge information under the target network mode, and send the bridge information to the SMF node.

[0041] The present application also provides a bridge construction and discovery device, which is applied to an SMF node, and includes:

[0042] A first receiving module is configured to receive a PDU session establishment request sent by a terminal device, wherein the PDU session establishment request carries first indication information, and the first indication information is used to indicate the modality type of the TSN bridge to be established; under different network modes, the protocol stack structure of the UPF node is different;

[0043] A processing module is used to obtain bridge information that matches the target network modality under the modality type, and to construct and discover a TSN bridge based on the bridge information; wherein the bridge information includes an identifier of a UPF instance that carries the target network modality, and different UPF instances are used to carry TSN bridges under different network modalities.

[0044] The present application also provides a network bridge construction and discovery device, which is applied to a terminal device, and includes:

[0045] A first sending module is used to send a PDU session establishment request to the SMF node, wherein the PDU session establishment request carries first indication information, and the first indication information is used to indicate the target network mode of the time-sensitive network TSN bridge to be established corresponding to the terminal device. Under different network modes, the protocol stack structure of the user plane function UPF node is different;

[0046] The second receiving module is used to receive the DS-TT port number sent by the SMF node.

[0047] The present application also provides a bridge construction and discovery device, which is applied to a PCF node, and includes:

[0048] The third receiving module is used to receive a session policy creation request sent by the SMF node; wherein the session policy creation request carries a target network modality identifier of the target network modality of the UPF node, the UPF node is pre-configured with multiple network modalities, and the protocol stack structure of the UPF node is different under different network modalities;

[0049] A second sending module is used to send a policy control request trigger condition to the SMF node, where the policy creation request trigger condition includes a target trigger condition that instructs the SMF node to report the bridge information under the target network modality to the PCF node;

[0050] The fourth receiving module is used to receive the target bridge information sent by the SMF node after the target trigger condition is triggered, and discover the TSN bridge based on the target bridge information; wherein, the target bridge information includes the bridge information allocated by the UPF node and the MAC address of the DS-TT sent by the terminal device to the SMF node.

[0051] The present application also provides a bridge construction and discovery device, which is applied to a UPF node. The UPF node is pre-configured with multiple network modes. Under different network modes, the protocol stack structure of the UPF node is different. The device includes:

[0052] A fifth receiving module, configured to receive a packet forwarding control protocol PFCP session establishment request sent by an SMF node and carrying a network modality identifier of the network modality of the DN node;

[0053] a determination module, configured to determine a target network modality of the UPF node corresponding to the network modality of the DN node;

[0054] The third sending module is used to determine the bridge information under the target network mode and send the bridge information to the SMF node.

[0055] The present application provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the above-mentioned bridge construction and discovery method is implemented.

[0056] This specification provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the above-mentioned bridge construction and discovery method is implemented.

[0057] The method provided by the present application can pre-configure different network modes in the UPF node. Under different network modes, the protocol stack composition of the UPF node is different. When the terminal device sends a PDU session establishment request, it can carry a first indication information indicating the mode type of the TSN bridge to be built. In this way, the TSN bridge can be constructed and discovered under the target network mode corresponding to the first indication information. Since the same UPF node can be configured with multiple network modes, a corresponding TSN bridge can be constructed under each network mode. Therefore, based on this method, multiple TSN bridges can be carried by one UPF node; in addition, since the protocol stack composition of the UPF node under different network modes is different, the 5G TSN bridge constructed based on the method provided by the present application can support heterogeneous networking of diverse constellation protocol systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 This is a network architecture in which a 5G network serves as a TSN bridge, as shown in an exemplary embodiment of the present application;

[0059] Figure 2 This is a schematic diagram of a UPF protocol stack structure shown in an exemplary embodiment of the present application;

[0060] Figure 3 This is a flowchart of a 5G TSN bridge construction and discovery process shown in an exemplary embodiment of the present application;

[0061] Figure 4 This is an interactive flow chart of a bridge construction and discovery method shown in an exemplary embodiment of the present application;

[0062] Figure 5 This is a network architecture of a 5G TSN bridge shown in an exemplary embodiment of the present application;

[0063] Figure 6 This is a flow chart of a method for building and discovering a network bridge, as shown in an exemplary embodiment of the present application;

[0064] Figure 7 is a flowchart of another bridge construction and discovery method shown in an exemplary embodiment of the present application;

[0065] Figure 8 is a flowchart of another bridge construction and discovery method shown in an exemplary embodiment of the present application;

[0066] Figure 9is a flowchart of another bridge construction and discovery method shown in an exemplary embodiment of the present application;

[0067] Figure 10 This is a schematic diagram of a network bridge construction and discovery device shown in an exemplary embodiment of the present application;

[0068] Figure 11 is a schematic diagram of another network bridge construction and discovery device shown in an exemplary embodiment of the present application;

[0069] Figure 12 is a schematic diagram of another network bridge construction and discovery device shown in an exemplary embodiment of the present application;

[0070] Figure 13 is a schematic diagram of another network bridge construction and discovery device shown in an exemplary embodiment of the present application;

[0071] Figure 14 It is a structural diagram of a computer device shown in an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0072] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0073] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0074] It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0075] The existing satellite-ground fusion network is fragmented due to the constellation satellite protocol stack. The coexistence of multiple protocols makes intercommunication between the satellite and the ground and between satellites difficult. Data is deposited on each fragmented independent satellite, making it difficult to realize the collaborative value of integrated satellite-ground data.

[0076] The 5G TSN Bridge achieves wider network coverage and more flexible network deployment by integrating 5G and TSN. Figure 1 As shown in the figure, a 5G network provided in an embodiment of the present application is used as a TSN bridge network architecture. Each bridge is composed of a terminal side time-sensitive network converter (Device Side TSN Translator, DS-TT), a terminal device (User Equipment, UE), a radio access network (Radio Access Network, RAN), a user plane function (User Plane Function, UPF) and a network side time-sensitive network converter (Network side TSN Translator, NW-TT).

[0077] Here, each UPF has only one node ID, and the Node ID is bound to the bridge ID of the TSN bridge. Therefore, each Node ID can only carry one TSN bridge. Figure 1 In the example, UPF-A carries 5G bridge A, and UPF-B carries 5G bridge B.

[0078] The protocol stack structure of 5G UPF is fixed and exemplary, see Figure 2 As shown, a schematic diagram of the protocol stack structure of a UPF provided by the present application is given, including layer 1: physical layer (PHY), such as microwave / laser, layer 2: Ethernet protocol (Ethernet), layer 3: IP layer, layer 4: user datagram protocol (UDP) layer, layer 5: general packet radio service tunneling protocol control plane (GPRS Tunneling ProtocolControl Plane, GTP-C) / general packet radio service tunneling protocol user plane (GPRS Tunneling Protocol-User Plane, GTP-U), layer 6: packet forwarding control protocol (Packet Forwarding Control Protocol, PFCP).

[0079] In existing technologies, NW-TT is deployed on the UPF side, and the NW-TT port number is pre-configured to the UPF. Each 5G TSN bridge uses a protocol data unit session (PDU session) to bind the DS-TT port number, the DS-TT media access control address (MAC address), and the NW-TT port number to jointly carry uplink and downlink TSN service data.

[0080] See also Figure 3 As shown in FIG, a flowchart of the construction and discovery process of a 5G TSN bridge provided by this application includes the following steps:

[0081] Step 1: The UE sends a PDU session establishment request to the Session Management Function (SMF).

[0082] The PDU session establishment request carries the MAC address of the DS-TT and the PDU session type (Ethernet). In addition, the PDU session establishment request can also carry the Port Management Information Container (PMIC) identifier to obtain the DS-TT port number assigned by the UPF. Specifically, the UE can Figure 3 The next generation Node B (gNB) node shown in FIG sends a PDU session establishment request to the SMF node.

[0083] Step 2: SMF obtains the triggering conditions for discovering and reporting new bridges carrying TSN bridging services from PCF through the session policy creation (Npcf_SMPolicyControl_Create) process.

[0084] Here, the triggering condition for bridge discovery reporting can be understood as the conditions under which the SMF node needs to report bridge information to the PCF node for subsequent bridge discovery process.

[0085] Exemplarily, the triggering condition for the bridge discovery report may be: after obtaining the DS-TT port number, NW-TT port number and bridge identifier from the UPF, reporting to the PCF node.

[0086] Step 3: The SMF node requests and obtains the DS-TT port number, NW-TT port number, and UPF node ID / bridge ID (Bridge ID) assigned by the UPF node through the Packet Forwarding Control Protocol (PFCP) session establishment process.

[0087] Step 4: The SMF node returns the allocated DS-TT port number to the UE via the PDU session establishment reply.

[0088] Step 5: The SMF node reports the bridge information to the PCF node through the PCF policy update process (Npcf_SMPolicyControl_Update).

[0089] The bridge information reported here includes the DS-TT port number, NW-TT port number, UPF node identifier / bridge identifier (Bridge ID), and DS-TT MAC address.

[0090] Step 6: After receiving the bridge information reported by the SMF node, the PCF node reports the bridge information to the TSN Application Function (TSN-AF) through the Npcf_PolicyAuthorizationNotify process.

[0091] Step 7: Create a new AF session between the PCF node and the TSN-AF node, and bind the AF session to the bridge information.

[0092] Step 8. Configure the bridge and obtain the transmission delay on the DS-TT and NW-TT sides of the TSN bridge.

[0093] Step 9: The PCF node reports the acquired transmission delay to TSN-AF.

[0094] Step 10: Carry TSN uplink and downlink services based on the transmission characteristics of the TSN bridge.

[0095] From the above steps, it can be seen that since the TSN bridge is bound to the UPF node identifier, a UPF node can only carry one TSN bridge, and the existing 5G TSN bridge relies on the fixed protocol stack of UPF. The UPF node protocol stack causes the UE to only support the establishment of standard Ethernet type PDU session pipes. Therefore, the existing 5G TSN bridge is not compatible with heterogeneous networking of diverse constellation protocol systems.

[0096] Based on this, the present application provides a method for building and discovering a bridge, which can pre-configure different network modes in the UPF node. Under different network modes, the protocol stack composition of the UPF node is different. When the terminal device sends a PDU session establishment request, it can carry a first indication information indicating the mode type of the TSN bridge to be built. In this way, the TSN bridge can be built and discovered under the target network mode corresponding to the first indication information. Since the same UPF node can be configured with multiple network modes, a corresponding TSN bridge can be built under each network mode. Therefore, based on this method, multiple TSN bridges can be carried by one UPF node; in addition, since the protocol stack composition of the UPF node under different network modes is different, the 5G TSN bridge constructed based on the method provided by this application can support heterogeneous networking of diverse constellation protocol systems.

[0097] The following is a detailed introduction to the bridge construction and discovery method provided by this application in conjunction with specific embodiments.

[0098] See also Figure 4 The figure shows an interactive flow chart of a bridge construction and discovery method provided by this application. The nodes involved in this interactive flow chart include a terminal device (i.e., UE) deploying DS-TT, an SMF node, a PCF node, a TSN-AF node, a UPF node deploying NW-TT, and a data network (DN). Other nodes, such as gNB nodes, may also be involved, but these are not detailed in the figure.

[0099] The specific process of this method includes the following steps:

[0100] Step 1: The UE sends a PDU session establishment request to the SMF node.

[0101] Among them, the PDU session establishment request carries first indication information, which is used to indicate the mode type of the TSN bridge to be built. Under different network modes, the protocol stack structure of the UPF node is different.

[0102] Here, the mode type of the TSN bridge can include the default mode and the non-default mode. In the default mode, the protocol stack of the UPF node can be in the default form, for example, Figure 2 The configuration shown in Figure 2 is different from the default configuration. In non-default mode, the protocol stack of the UPF node can differ from the default configuration. For example, in non-default mode m, the protocol stack of the UPF node can be: Layer 1: Physical layer, Layer 2: Non-standard Ethernet protocol, Layer 3: Gateway layer, Layer 4: UDP layer, Layer 5: GTP-C / GTP-U, Layer 6: PFCP. In actual applications, UPF nodes can be pre-configured with multiple network modes as needed.

[0103] In addition, the PDU session establishment request may also carry the MAC address of the DS-TT and a PMIC transmission support identifier.

[0104] Optionally, the information element structure of the PDU session establishment request is as shown in Table 1 below, and the first indication information can be carried in the PDU session type (PDU Session Type) information element of the PDU session establishment request. In the case where the first indication information indicates a non-default mode, illustratively, a modal PDU session type "Network Modality" can be added to the "PDU session type value (PDU session type value, information element structure as shown in Table 3 below)" carried in the "PDU Session Type" information element (the information element structure is shown in Table 2 below), and the original value is retained as "1 1 1" to refer to the newly added PDU session type. Here, the newly added PDU session type can be understood as the modal type of the TSN bridge.

[0105] Table 1: PDU Session Establishment Request Element Structure

[0106]

[0107] Table 2: PDU session type information element structure

[0108]

[0109] Table 3: PDU session type value information element structure

[0110]

[0111] After receiving the PDU session establishment request, the SMF node can first determine the target modality type under the modality type indicated by the first indication type, and then build and discover the TSN bridge under the target modality type.

[0112] In one embodiment of the present application, the SMF node includes pre-configured first network modality information of the UPF node in each network modality, and second network modality information of the DN node in each network modality. Here, the network modality of the UPF node corresponds one-to-one with the network modality of the DN node. The network modality information may include, for example, a network modality identifier, protocol stack composition information in each network modality, and the like.

[0113] When determining the target network modal information, it can be divided into the following two cases:

[0114] Case 1: When the address of the DN node is carried in the PDU session establishment request, the network mode of the DN node is determined based on the address of the DN node, and the target network mode is determined based on the network mode of the DN node and the correspondence between the first network mode information and the second network mode information.

[0115] Here, the correspondence between each DN node address and the network mode can be pre-configured in the SMF node.

[0116] Case 2: When the address of the DN node is not carried in the PDU session establishment request, the network mode of the DN node is determined based on the pre-configured second network mode information, the mode type and the service type of the terminal device, and the target network mode is determined based on the network mode of the DN node and the corresponding relationship.

[0117] Specifically, when determining the network mode of the DN node based on the pre-configured second network mode information, the mode type and the service type of the terminal device, if the mode type indicated by the first indication information is the default mode, the default mode type can be directly used as the mode type of the DN node; if the mode type indicated by the first indication information is a non-default mode, the network mode of the DN node can be determined based on the service type of the terminal device and the pre-configured second network mode information.

[0118] In another embodiment, the service data of the terminal device may not be sent to the DN node, but may be sent to the network slice. In this case, the information pre-configured by the SMF node also includes the third modality information of the network slice under each network mode; if the PDU session establishment request carries a network slice identifier, the modality information corresponding to the network slice can be determined based on the correspondence between each network slice identifier and the network mode pre-configured in the SMF node, and then the target network mode is determined based on the correspondence between the modality information of the network slice and the first modality information. If the PDU session establishment request does not carry a network slice identifier, the modality information of the network slice can be determined as the default mode, and the target network mode can be determined based on the service type of the terminal device.

[0119] It should be noted here that if the business data of the terminal device is sent to the network slice, all the interaction processes with the DN node introduced later in this application can interact with the network slice to achieve similar technical effects. For example, when the SMF node determines the bridge information, it is determined based on the network mode of the network slice. The subsequent steps refer to the embodiment below and will not be described in detail here.

[0120] Step 2: Obtain the triggering conditions for reporting bridge information in the target network mode.

[0121] Specifically, the SMF node can send a session policy creation request carrying the target network modality identifier of the target network modality to the PCF node, and then receive the policy control request trigger condition sent by the PCF node, where the policy control request trigger condition includes a target trigger condition instructing the SMF node to report the bridge information under the target network modality to the PCF node.

[0122] For example, the SMF node can add a modal bridge policy acquisition indication (here refers to the trigger condition acquisition indication for the bridge information reported by the target network mode) to the "session policy context data (SmPolicyContextData)" carried in the session policy creation request (Npcf_SMPolicyControl_Createrequest), and then obtain the target trigger condition contained in the policyCtrlReqTriggers (i.e., the policy control request trigger condition) from the PCF.

[0123] Specifically, the network element "Enable Network Modality for TSC" can be added to SmPolicyContextData to indicate that the PDU session currently used by the PCF node for the TSN bridge requires network modality discovery capability. Here, network modality discovery capability can be understood as the discovery capability of the network modality under the non-default mode.

[0124] After detecting "EnableNetworkModalityforTSC = True", the PCF node can add the "TSN Bridge Information Network Mode (TSN_BRIDGE_INFO_NW)" network element in policyCtrlReqTriggers to indicate that TSN bridge information in non-default mode should be reported.

[0125] Step 3: Get the bridge information that matches the target network mode.

[0126] Here, the acquired bridge information includes the identifier of the UPF instance that carries the target network mode. Different UPF instances are used to carry TSN bridges under different network modes, and also includes the DS-TT port number, NW-TT port number, and TSN bridge identifier assigned by the UPF node.

[0127] Optionally, when obtaining bridge information that matches the target network modality, a Packet Data Unit Session Path Control Protocol (PFCP) session establishment request carrying the network modality identifier of the network modality of the DN node can be sent to the UPF node; and then a PFCP session establishment response carrying the bridge information sent by the UPF node is received.

[0128] Exemplarily, the SMF node may carry an enhanced "Create Bridge / routerInfo" information element with a network mode indication in a PFCP Session Establishment Request, and then send the PFCP Session Establishment Request to the UPF.

[0129] The Create Bridge / Router Info information element structure is shown in Table 4 below. The network modality TSC bridge discovery method is indicated by adding the "Network Modality (NM)" information element structure based on the "Create TSC Bridge Information" information element defined in TS29.244.

[0130] Table 4: Create Bridge / router Info Message Structure

[0131]

[0132] In Table 4 above, the third bit of the fifth octet: If "NM" is set to "1" and the first bit of the fifth octet, "Bridge Information Indicator (BII)", is set to "1", it instructs the UPF node to report the allocated DS-TT / NW-TT port number, the corresponding bridge ID, and other bridge information of the bound network mode. The eight bits of the sixth and seventh octets: Network Modality Value, used to pass the DN-side network modality value pre-configured on the SMF side to the user plane UPF. For example, if the network mode of the DN node is mode m, the value of Network Modality Value is m.

[0133] The UPF responds to the SMF's Network Mode TSC Bridge Discovery Indication (NM flag in Table 4 above) by carrying the enhanced "Created NM Bridge Info for TSC" information element structure with network mode indication in the PFCP Session Establishment Response.

[0134] The "Created NM Bridge Info for TSC" information element structure contains three information element structures: "Network Modality Instance Identifier (NMInstanceId)", "Network Modality Information (Network Modality Info)" and "Created Bridge / Router Info"

[0135] Network modality instance identifier (NMInstanceId): used to indicate the UPF instance that carries the current network modality (i.e., the target network modality);

[0136] Network Modality: The "Network Modality Info" cell structure is used to indicate the network modality configuration information of the current TSN bridge. The "Network Modality Value" is used to indicate the network modality information pre-synchronized on the SMF and UPF sides.

[0137] Created Bridge / Router Info: This field indicates the DS-TT and NW-TT port information corresponding to the modal bridge assigned to the NMInstanceId that carries the Network Modality Info under the Bridge ID of the current UPF.

[0138] Step 4: The SMF node sends the DS-TT port number allocated by the UPF to the UE.

[0139] Here, the SMF node can send a PDU session establishment response to the UE and carry the DS-TT port number in the PDU session establishment response.

[0140] After the DS-TT port number is sent to the UE, the TSN bridge in the target network mode is established. However, after the TSN bridge is established, it needs to go through the subsequent discovery process to configure the TSN bridge and bind the AF before it can be used to transmit business data.

[0141] Step 5: The SMF node sends the bridge information assigned by the UPF node and the MAC address of the DS-TT to the PCF node.

[0142] Here, the SMF node triggers the above-mentioned target trigger condition after receiving the bridge information assigned by the UPF node. Then the SMF node can respond to the target trigger condition being triggered and send the bridge information assigned by the UPF node and the MAC address of the DS-TT to the PCF node.

[0143] Exemplarily, the SMF node may discover and report the above information by carrying an enhanced session policy update context data (SmPolicyUpdateContextData) information element in a session policy update request (Npcf_SMPolicyControl_Update request).

[0144] Step 6: The PCF node reports the bridge information and the MAC address of the DS-TT, as well as the corresponding target network mode identifier, to the TSN-AF node.

[0145] Exemplarily, the PCF node may report the above information to the TSN-AF node through the Npcf_PolicyAuthorization_Notify process.

[0146] Step 7: Create an AF session related to the TSN bridge in the target network mode between the PCF node and the TSN-AF node, and subscribe to TSN events on the AF session.

[0147] Exemplarily, the PCF node and the TSN-AF node may create an AF session related to the TSN bridge in the target network mode through the Npcf_PolicyAuthorization_Create / Subscribe process, and subscribe to TSN events on the AF session.

[0148] In addition, the PCF node can also bind the newly created AF session, PDU session and the established TSN bridge.

[0149] Step 8. Configure the built TSN bridge and obtain the TSN bridge DS-TT and NW-TT transmission delay information under the target network mode.

[0150] Exemplarily, the TSN-AF node configures the newly discovered TSN bridge through the PFCP Session Modification process and PDU Session Modification process defined by the Npcf_PolicyAuthorization_Update process, and obtains the NW-TT and DS-TT transmission delay information of the TSN bridge through the Npcf_PolicyAuthorization_Notify system process.

[0151] Step 9: The PCF node reports the NW-TT and DS-TT transmission delay information to the TSN-AF node.

[0152] Step 10: Carry TSN uplink and downlink services based on the transmission characteristics of the TSN bridge.

[0153] This completes the discovery process for the TSN bridge in the target network mode. By binding the DS-TT MAC address, DS-TT port number, NW-TT port number, UPF node identifier / bridge identifier, UPF network mode (UPF protocol stack components), the instance identifier carrying the UPF network mode, and NW-TT and DS-TT transmission latency information, the TSN-AF successfully builds and discovers a 5G-TSN bridge, enabling it to carry TSN uplink and downlink services.

[0154] Combined with the above Figure 4 The method provided, reference Figure 5 As shown, Figure 5 A network architecture of a 5G TSN bridge provided in an embodiment of the present application adds network modality dimension information (i.e., the instance identifier of the network modality carrying the UPF) to the existing TSN bridge information (DS-TT port number, MAC address of DS-TT, NW-TT port number, UPF node identifier / bridge identifier) based on the standard Ethernet protocol stack, so that the original UPF single node that can only support a single TSN bridge is expanded to a TSN bridge that supports multiple modes at the same time. Figure 5 In the example, the mode 1 instance of UPF-A is used to carry bridge A, and the mode 2 instance of UPF-A is used to carry bridge B.

[0155] The bridge identifier in the method provided by this application and the UPF instance identifier that carries the network mode jointly play the role of the bridge identifier in the original method.

[0156] In the above method, since the same UPF node can be configured with multiple network modes, a corresponding TSN bridge can be constructed under each network mode. Therefore, based on this method, multiple TSN bridges can be carried by one UPF node; in addition, since the protocol stack composition of the UPF node under different network modes is different, the 5G TSN bridge constructed based on the method provided in this application can support heterogeneous networking of diverse constellation protocol systems.

[0157] Based on the same concept, this application also provides a bridge construction and discovery method, which is applied to SMF nodes, see Figure 6 The figure shows a flow chart of a bridge construction and discovery method provided by the present application, which includes the following steps:

[0158] S601. Receive a PDU session establishment request sent by a terminal device, wherein the PDU session establishment request carries first indication information, and the first indication information is used to indicate the mode type of the TSN bridge to be built; under different network modes, the protocol stack structure of the UPF node is different.

[0159] S602. Obtain bridge information that matches the target network modality under the modality type, and construct and discover a TSN bridge based on the bridge information; wherein the bridge information includes the identifier of the UPF instance that carries the target network modality, and different UPF instances are used to carry TSN bridges under different network modalities.

[0160] In one possible implementation, the SMF node includes pre-configured first network modality information of the UPF node in each network modality, and second network modality information of the data network DN node in each network modality;

[0161] The method further includes determining the target network modality according to the following method:

[0162] In a case where the PDU session establishment request carries the address of the DN node, determining the network modality of the DN node based on the address of the DN node, and determining the target network modality based on the network modality of the DN node and the correspondence between the first network modality information and the second network modality information;

[0163] When the address of the DN node is not carried in the PDU session establishment request, the network mode of the DN node is determined based on the pre-configured second network mode information, the mode type and the service type of the terminal device, and the target network mode is determined based on the network mode of the DN node and the corresponding relationship.

[0164] In a possible implementation, the network modality information includes a network modality identifier;

[0165] After determining the target network modality, the method further includes:

[0166] Sending a session policy creation request carrying a target network modality identifier of the target network modality to a policy control function (PCF) node;

[0167] Receive a policy control request trigger condition sent by the PCF node, where the policy control request trigger condition includes a target trigger condition instructing the SMF node to report the bridge information under the target network mode to the PCF node.

[0168] In a possible implementation manner, the PDU session establishment request further carries a media access control address MAC address of the DS-TT deployed by the terminal device;

[0169] Discovering a TSN bridge based on the bridge information includes:

[0170] After obtaining the bridge information matching the target network modality, in response to the target trigger condition being triggered, the bridge information and the MAC address of the DS-TT are sent to the PCF node to instruct the PCF to report the bridge information and the MAC address of the DS-TT to the TSN application function network element AF.

[0171] In a possible implementation, obtaining bridge information matching the target network modality includes:

[0172] Sending a Packet Forwarding Control Protocol (PFCP) session establishment request carrying a network modality identifier of the network modality of the DN node to the UPF node;

[0173] Receive a PFCP session establishment response sent by the UPF node and carrying the bridge information.

[0174] In a possible implementation manner, the bridge information further includes:

[0175] The terminal side time-sensitive network converter DS-TT port number, network side time-sensitive network converter NW-TT port number, and TSN bridge identifier allocated by the UPF node;

[0176] The constructing of the TSN bridge based on the bridge information includes:

[0177] Send the DS-TT port number to the terminal device.

[0178] Based on the same concept, this application also provides a bridge construction and discovery method, which is applied to terminal devices, see Figure 7The figure shows a flow chart of a bridge construction and discovery method provided by the present application, which includes the following steps:

[0179] S701. Send a PDU session establishment request to the SMF node, wherein the PDU session establishment request carries first indication information, and the first indication information is used to indicate the target network mode of the time-sensitive network TSN bridge to be established corresponding to the terminal device. Under different network modes, the protocol stack structure of the user plane function UPF node is different;

[0180] S702. Receive the DS-TT port number sent by the SMF node.

[0181] Based on the same concept, this application also provides a bridge construction and discovery method, which is applied to PCF nodes, see Figure 8 The figure shows a flow chart of a bridge construction and discovery method provided by the present application, which includes the following steps:

[0182] S801. Receive a session policy creation request sent by an SMF node; wherein the session policy creation request carries a target network modality identifier of a target network modality of a UPF node. The UPF node is pre-configured with multiple network modalities. Under different network modalities, the protocol stack structure of the UPF node is different.

[0183] S802, sending a policy control request trigger condition to the SMF node, wherein the policy creation request trigger condition includes a target trigger condition instructing the SMF node to report the bridge information under the target network modality to the PCF node;

[0184] S803. Receive the target bridge information sent by the SMF node after the target trigger condition is triggered, and discover the TSN bridge based on the target bridge information; wherein, the target bridge information includes the bridge information allocated by the UPF node and the MAC address of the DS-TT sent by the terminal device to the SMF node.

[0185] In a possible implementation, the discovering of the TSN bridge based on the target bridge information includes:

[0186] Reporting the target bridge information and the target network modality identifier corresponding to the target bridge information to the TSN-AF node;

[0187] Create an AF session associated with the TSN bridge in the target network mode, and subscribe to TSN events on the AF session;

[0188] Determine the transmission delay information of the TSN bridge under the target network mode, and report the transmission delay information to the TSN-AF node.

[0189] Based on the same concept, the present application also provides a bridge construction and discovery method, which is applied to a UPF node. The UPF node is pre-configured with multiple network modes. Under different network modes, the protocol stack of the UPF node is different. Figure 9 The figure shows a flow chart of a bridge construction and discovery method provided by the present application, which includes the following steps:

[0190] S901, receiving a packet forwarding control protocol PFCP session establishment request sent by an SMF node and carrying a network modality identifier of the network modality of the DN node;

[0191] S902: Determine a target network modality of the UPF node corresponding to the network modality of the DN node;

[0192] S903: Determine the bridge information under the target network mode, and send the bridge information to the SMF node.

[0193] For detailed description of the above steps, please refer to the above embodiment and will not be repeated here.

[0194] Corresponding to the aforementioned embodiments of the network bridge construction and discovery method, the present application also provides embodiments of the network bridge construction and discovery device.

[0195] See also Figure 10 FIG. 1 is a schematic diagram of a bridge construction and discovery device provided by the application, which is applied to an SMF node and specifically includes:

[0196] The first receiving module 1001 is used to receive a PDU session establishment request sent by a terminal device, wherein the PDU session establishment request carries first indication information, and the first indication information is used to indicate the modality type of the TSN bridge to be established; under different network modes, the protocol stack structure of the UPF node is different;

[0197] Processing module 1002 is used to obtain bridge information that matches the target network modality under the modality type, and to construct and discover a TSN bridge based on the bridge information; wherein the bridge information includes the identifier of the UPF instance that carries the target network modality, and different UPF instances are used to carry TSN bridges under different network modalities.

[0198] Optionally, the SMF node includes pre-configured first network modality information of the UPF node in each network modality, and second network modality information of the data network DN node in each network modality;

[0199] The processing module 1002 is further configured to determine the target network modality according to the following method:

[0200] In a case where the PDU session establishment request carries the address of the DN node, determining the network modality of the DN node based on the address of the DN node, and determining the target network modality based on the network modality of the DN node and the correspondence between the first network modality information and the second network modality information;

[0201] When the address of the DN node is not carried in the PDU session establishment request, the network mode of the DN node is determined based on the pre-configured second network mode information, the mode type and the service type of the terminal device, and the target network mode is determined based on the network mode of the DN node and the corresponding relationship.

[0202] Optionally, the network modality information includes a network modality identifier;

[0203] After determining the target network modality, the processing module 1002 is further configured to:

[0204] Sending a session policy creation request carrying a target network modality identifier of the target network modality to a policy control function (PCF) node;

[0205] Receive a policy control request trigger condition sent by the PCF node, where the policy control request trigger condition includes a target trigger condition instructing the SMF node to report the bridge information under the target network mode to the PCF node.

[0206] Optionally, the PDU session establishment request further carries a media access control address MAC address of the DS-TT deployed by the terminal device;

[0207] The processing module 1002 is configured to:

[0208] After obtaining the bridge information matching the target network modality, in response to the target trigger condition being triggered, the bridge information and the MAC address of the DS-TT are sent to the PCF node to instruct the PCF to report the bridge information and the MAC address of the DS-TT to the TSN application function network element AF.

[0209] Optionally, when acquiring bridge information matching the target network modality, the processing module 1002 is configured to:

[0210] Sending a Packet Forwarding Control Protocol (PFCP) session establishment request carrying a network modality identifier of the network modality of the DN node to the UPF node;

[0211] Receive a PFCP session establishment response sent by the UPF node and carrying the bridge information.

[0212] Optionally, the bridge information further includes:

[0213] The terminal side time-sensitive network converter DS-TT port number, network side time-sensitive network converter NW-TT port number, and TSN bridge identifier allocated by the UPF node;

[0214] The processing module 1002 is configured to:

[0215] Send the DS-TT port number to the terminal device.

[0216] Based on the same concept, the present application also provides a bridge construction and discovery device, which is applied to terminal equipment, see Figure 11 FIG. 1 is a schematic diagram of a network bridge construction and discovery device provided by the present application, including:

[0217] The first sending module 1101 is used to send a PDU session establishment request to the SMF node, wherein the PDU session establishment request carries first indication information, and the first indication information is used to indicate the target network mode of the time-sensitive network TSN bridge to be established corresponding to the terminal device. Under different network modes, the protocol stack structure of the user plane function UPF node is different;

[0218] The second receiving module 1102 is configured to receive the DS-TT port number sent by the SMF node.

[0219] Based on the same concept, this application also provides a bridge construction and discovery device, which is applied to PCF nodes, see Figure 12 FIG. 1 is a schematic diagram of a network bridge construction and discovery device provided by the present application, including:

[0220] The third receiving module 1201 is used to receive a session policy creation request sent by the SMF node; wherein the session policy creation request carries a target network modality identifier of the target network modality of the UPF node, and the UPF node is pre-configured with multiple network modalities. Under different network modalities, the protocol stack structure of the UPF node is different;

[0221] The second sending module 1202 is used to send a policy control request trigger condition to the SMF node, where the policy creation request trigger condition includes a target trigger condition instructing the SMF node to report the bridge information under the target network mode to the PCF node;

[0222] The fourth receiving module 1203 is used to receive the target bridge information sent by the SMF node after the target trigger condition is triggered, and discover the TSN bridge based on the target bridge information; wherein, the target bridge information includes the bridge information allocated by the UPF node and the MAC address of the DS-TT sent by the terminal device to the SMF node.

[0223] Optionally, the fourth receiving module 1203 is specifically configured to:

[0224] Reporting the target bridge information and the target network modality identifier corresponding to the target bridge information to the TSN-AF node;

[0225] Create an AF session associated with the TSN bridge in the target network mode, and subscribe to TSN events on the AF session;

[0226] Determine the transmission delay information of the TSN bridge under the target network mode, and report the transmission delay information to the TSN-AF node.

[0227] Based on the same concept, the present application also provides a bridge construction and discovery device, which is applied to a UPF node. The UPF node is pre-configured with multiple network modes. Under different network modes, the protocol stack of the UPF node is different. Figure 13 FIG. 1 is a schematic diagram of a network bridge construction and discovery device provided by the present application, including:

[0228] The fifth receiving module 1301 is configured to receive a packet forwarding control protocol PFCP session establishment request sent by an SMF node and carrying a network modality identifier of the network modality of the DN node;

[0229] A determination module 1302 is configured to determine a target network modality of the UPF node corresponding to the network modality of the DN node;

[0230] The third sending module 1303 is used to determine the bridge information under the target network mode and send the bridge information to the SMF node.

[0231] The implementation process of the functions and effects of each unit in the above-mentioned device is specifically described in the implementation process of the corresponding steps in the above-mentioned method, and will not be repeated here.

[0232] For the device embodiments, since they basically correspond to the method embodiments, the relevant parts can be referred to the partial description of the method embodiments. The device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present application scheme. A person of ordinary skill in the art can understand and implement it without paying any creative work.

[0233] The present application also provides a computer-readable storage medium, which stores a computer program. The computer program can be used to execute the bridge construction and discovery method described in the above embodiment.

[0234] This application also provides a computer device, see Figure 14 As shown, it is a structural diagram of the computer device provided by this application. At the hardware level, the electronic device includes a processor, an internal bus, a network interface, a memory and a non-volatile memory, and of course may also include hardware required for other services. The processor reads the corresponding computer program from the non-volatile memory into the memory and then runs it to implement the bridge construction and discovery method described in the above embodiment. Of course, in addition to software implementation, this specification does not exclude other implementation methods, such as logic devices or a combination of software and hardware, etc., that is to say, the execution subject of the following processing flow is not limited to each logic unit, but can also be hardware or logic devices.

[0235] Embodiments of the subject matter and functional operations described in this specification may be implemented in the following: digital electronic circuits, tangibly embodied computer software or firmware, computer hardware including the structures disclosed in this specification and their structural equivalents, or a combination of one or more of them. Embodiments of the subject matter described in this specification may be implemented as one or more computer programs, i.e., one or more modules of computer program instructions encoded on a tangible, non-transitory program carrier to be executed by a data processing device or to control the operation of the data processing device. Alternatively or additionally, the program instructions may be encoded on an artificially generated propagation signal, such as a machine-generated electrical, optical, or electromagnetic signal, which is generated to encode information and transmit it to a suitable receiver device for execution by the data processing device. The computer storage medium may be a machine-readable storage device, a machine-readable storage substrate, a random or serial access memory device, or a combination of one or more of them.

[0236] The processes and logic flows described in this specification can be performed by one or more programmable computers executing one or more computer programs to perform the corresponding functions by operating on input data and generating output. The processes and logic flows can also be performed by, and apparatus can be implemented as, special-purpose logic circuitry, such as an FPGA (field programmable gate array) or an ASIC (application-specific integrated circuit).

[0237] Computers suitable for executing computer programs include, for example, general-purpose and / or special-purpose microprocessors, or any other type of central processing unit. Typically, the central processing unit will receive instructions and data from a read-only memory and / or random access memory. The basic components of a computer include a central processing unit for implementing or executing instructions and one or more memory devices for storing instructions and data. Typically, a computer will also include one or more mass storage devices for storing data, such as magnetic disks, magneto-optical disks, or optical disks, or the computer will be operably coupled to such mass storage devices to receive data from them or to transmit data to them, or both. However, a computer does not necessarily have such devices. In addition, a computer can be embedded in another device, such as a mobile phone, a personal digital assistant (PDA), a mobile audio or video player, a game console, a global positioning system (GPS) receiver, or a portable storage device such as a universal serial bus (USB) flash drive, to name a few.

[0238] Computer-readable media suitable for storing computer program instructions and data include all forms of non-volatile memory, media, and storage devices, including, for example, semiconductor memory devices (e.g., EPROM, EEPROM, and flash memory devices), magnetic disks (e.g., internal hard disks or removable disks), magneto-optical disks, and CD ROM and DVD-ROM disks. The processor and memory can be supplemented by, or incorporated in, special purpose logic circuitry.

[0239] Although this specification includes many specific implementation details, these should not be interpreted as limiting the scope of any invention or the scope of protection claimed, but are mainly used to describe the features of specific embodiments of specific inventions. Certain features described in multiple embodiments within this specification may also be implemented in combination in a single embodiment. On the other hand, the various features described in a single embodiment may also be implemented separately in multiple embodiments or in any suitable sub-combination. In addition, although features may work in certain combinations as described above and even initially claimed as such, one or more features from the claimed combination may be removed from the combination in some cases, and the claimed combination may point to a sub-combination or a variation of the sub-combination.

[0240] Similarly, although operations are depicted in a particular order in the accompanying drawings, this should not be understood as requiring that these operations be performed in the particular order shown or performed sequentially, or that all illustrated operations be performed to achieve the desired results. In some cases, multitasking and parallel processing may be advantageous. In addition, the separation of various system modules and components in the above-described embodiments should not be understood as requiring such separation in all embodiments, and it should be understood that the described program components and systems can generally be integrated together in a single software product, or packaged into multiple software products.

[0241] Thus, specific embodiments of the subject matter have been described. Other embodiments are within the scope of the following claims. In some cases, the actions recited in the claims can be performed in a different order and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the particular order shown or sequential sequence to achieve the desired results. In some implementations, multitasking and parallel processing may be advantageous.

[0242] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A method for building and discovering a network bridge, characterized in that: The method is applied to a session management function (SMF) node, and includes: Receiving a packet data unit (PDU) session establishment request sent by a terminal device, wherein the PDU session establishment request carries first indication information, where the first indication information is used to indicate a modality type of a time-sensitive network (TSN) bridge to be established; under different network modes, the protocol stack composition of the user plane function (UPF) node is different; Obtain bridge information that matches the target network modality under the modality type, and construct and discover a TSN bridge based on the bridge information; wherein the bridge information includes the identifier of the UPF instance that carries the target network modality, and different UPF instances are used to carry TSN bridges under different network modalities.

2. The method according to claim 1, characterized in that The SMF node includes pre-configured first network modality information of the UPF node in each network modality, and second network modality information of the data network DN node in each network modality; The method further includes determining the target network modality according to the following method: In a case where the PDU session establishment request carries the address of the DN node, determining the network modality of the DN node based on the address of the DN node, and determining the target network modality based on the network modality of the DN node and the correspondence between the first network modality information and the second network modality information; When the address of the DN node is not carried in the PDU session establishment request, the network mode of the DN node is determined based on the pre-configured second network mode information, the mode type and the service type of the terminal device, and the target network mode is determined based on the network mode of the DN node and the corresponding relationship.

3. The method according to claim 2, characterized in that The network modality information includes a network modality identifier; After determining the target network modality, the method further includes: Sending a session policy creation request carrying a target network modality identifier of the target network modality to a policy control function (PCF) node; Receive a policy control request trigger condition sent by the PCF node, where the policy control request trigger condition includes a target trigger condition instructing the SMF node to report bridge information under the target network modality to the PCF node; The PDU session establishment request also carries the media access control address MAC address of the DS-TT deployed by the terminal device; Discovering a TSN bridge based on the bridge information includes: After obtaining the bridge information matching the target network modality, in response to the target trigger condition being triggered, the bridge information and the MAC address of the DS-TT are sent to the PCF node to instruct the PCF to report the bridge information and the MAC address of the DS-TT to the TSN application function network element AF.

4. The method according to claim 2, characterized in that The acquiring bridge information matching the target network modality includes: Sending a Packet Forwarding Control Protocol (PFCP) session establishment request carrying a network modality identifier of the network modality of the DN node to the UPF node; Receive a PFCP session establishment response sent by the UPF node and carrying the bridge information.

5. The method according to claim 4, characterized in that The bridge information also includes: The terminal side time-sensitive network converter DS-TT port number, network side time-sensitive network converter NW-TT port number, and TSN bridge identifier allocated by the UPF node; The constructing of the TSN bridge based on the bridge information includes: Send the DS-TT port number to the terminal device.

6. A method for building and discovering a network bridge, characterized in that: The method is applied to a terminal device, and the method includes: Send a PDU session establishment request to the SMF node, wherein the PDU session establishment request carries first indication information, and the first indication information is used to indicate the target network mode of the time-sensitive network TSN bridge to be built corresponding to the terminal device. Under different network modes, the protocol stack structure of the user plane function UPF node is different; Receive the DS-TT port number sent by the SMF node, wherein the DS-TT port number is sent by the SMF node after obtaining bridge information matching the target network modality from the UPF node, and the bridge information includes the DS-TT port number.

7. A method for building and discovering a network bridge, characterized in that: The method is applied to a PCF node, and the method includes: Receive a session policy creation request sent by an SMF node; wherein the session policy creation request carries a target network modality identifier of a target network modality of a UPF node, the UPF node is pre-configured with multiple network modalities, and under different network modalities, the protocol stack composition of the UPF node is different; Sending a policy control request trigger condition to the SMF node, wherein the policy creation request trigger condition includes a target trigger condition instructing the SMF node to report the bridge information under the target network modality to the PCF node; Receive the target bridge information sent by the SMF node after the target trigger condition is triggered, and discover the TSN bridge based on the target bridge information; wherein, the target bridge information includes the bridge information allocated by the UPF node and the MAC address of the DS-TT sent by the terminal device to the SMF node.

8. The method according to claim 7, characterized in that The discovering of the TSN bridge based on the target bridge information includes: Reporting the target bridge information and the target network modality identifier corresponding to the target bridge information to the TSN-AF node; Create an AF session associated with the TSN bridge in the target network mode, and subscribe to TSN events on the AF session; Determine the transmission delay information of the TSN bridge under the target network mode, and report the transmission delay information to the TSN-AF node.

9. A method for building and discovering a network bridge, characterized in that: The method is applied to a UPF node, wherein the UPF node is pre-configured with multiple network modes. Under different network modes, the protocol stack structure of the UPF node is different. The method includes: Receive a packet forwarding control protocol PFCP session establishment request sent by the SMF node and carrying the network mode identifier of the network mode of the DN node; Determining a target network modality of the UPF node corresponding to the network modality of the DN node; Determine the bridge information under the target network mode, and send the bridge information to the SMF node.

10. A network bridge construction and discovery device, characterized in that: The device is applied to an SMF node, and includes: A first receiving module is configured to receive a PDU session establishment request sent by a terminal device, wherein the PDU session establishment request carries first indication information, and the first indication information is used to indicate the modality type of the TSN bridge to be established; under different network modes, the protocol stack structure of the UPF node is different; A processing module is used to obtain bridge information that matches the target network modality under the modality type, and to construct and discover a TSN bridge based on the bridge information; wherein the bridge information includes an identifier of a UPF instance that carries the target network modality, and different UPF instances are used to carry TSN bridges under different network modalities.

11. A network bridge construction and discovery device, characterized in that: The device is applied to a terminal device, and includes: A first sending module is used to send a PDU session establishment request to the SMF node, wherein the PDU session establishment request carries first indication information, and the first indication information is used to indicate the target network mode of the time-sensitive network TSN bridge to be established corresponding to the terminal device. Under different network modes, the protocol stack structure of the user plane function UPF node is different; The second receiving module is used to receive the DS-TT port number sent by the SMF node, wherein the DS-TT port number is sent by the SMF node after obtaining the bridge information matching the target network modality from the UPF node, and the bridge information includes the DS-TT port number.

12. A network bridge construction and discovery device, characterized in that: The device is applied to a PCF node, and includes: The third receiving module is used to receive a session policy creation request sent by the SMF node; wherein the session policy creation request carries a target network modality identifier of the target network modality of the UPF node, the UPF node is pre-configured with multiple network modalities, and the protocol stack structure of the UPF node is different under different network modalities; A second sending module is used to send a policy control request trigger condition to the SMF node, where the policy creation request trigger condition includes a target trigger condition that instructs the SMF node to report the bridge information under the target network modality to the PCF node; The fourth receiving module is used to receive the target bridge information sent by the SMF node after the target trigger condition is triggered, and discover the TSN bridge based on the target bridge information; wherein, the target bridge information includes the bridge information allocated by the UPF node and the MAC address of the DS-TT sent by the terminal device to the SMF node.

13. A network bridge construction and discovery device, characterized in that: The device is applied to a UPF node. The UPF node is pre-configured with multiple network modes. Under different network modes, the protocol stack structure of the UPF node is different. The device includes: A fifth receiving module is used to receive a packet forwarding control protocol PFCP session establishment request sent by the SMF node and carrying a network modality identifier of the network modality of the DN node; a determination module, configured to determine a target network modality of the UPF node corresponding to the network modality of the DN node; The third sending module is used to determine the bridge information under the target network mode and send the bridge information to the SMF node.

14. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 9 are implemented.

15. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: The processor executes the steps of any one of the methods of claims 1 to 9.

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