WO2009036694A1 - Method, device and system for establishing multiple pdn connections - Google Patents

Abstract

A method, device and system for establishing multiple packet data node (PDN) connections are disclosed. The method includes: network side distributes multiple PDN connections data to user end (UE) based on bearer allocation strategy, said PDN connections data including multiple PDN connection establishment instructions used to instruct UE to establish multiple PDN connections. Embodiments of the invention enable flexible management of service-based bearer-establishment processes in the network and improve network operations and management performance.

Description

 Description Method, device and system for establishing multiple PDN connections

 [1] This application claims priority to Japanese Patent Application No. 20071012183, filed on Sep. 14, 2007, the content of which is hereby incorporated by reference.

 [2] Technical field

 [3] The present invention relates to the field of communications technologies, and in particular, to an implementation scheme for establishing a PDN connection for a terminal in a network.

 [4] Background of the invention

 [5] In order to ensure the competitiveness of 3GPP (3rd Generation Partnership Project) systems and enhance the ability of 3GPP systems to handle rapidly growing IP data, 3GPP proposes the SAE (System Architecture Evolution) architecture, which is required in the SAE architecture. Compatible with multiple access technologies.

 [6] At present, the terminal needs to obtain the PDN connection related to the data service in the process of acquiring the data service.

. If the terminal that needs to obtain the data service has not created a PDN connection, the terminal needs to initiate a request for PDN connection establishment, and then the network side allocates an IP address and related access resources to the terminal according to the request, so that the terminal The IP address and the related access resources can be used to establish a corresponding bearer, and the corresponding data service can be normally performed.

 [7] In the process of implementing the present invention, the inventor found that in some services, it may be necessary to create multiple Ps for the terminal.

DN connection to optimize the business. For example, in a VoIP (IP-based voice) service, the terminal needs the PDN connection at the home to ensure the continuity of the service, and the PDN connection at the visited place is required to implement the data. Therefore, the network needs to be the terminal. A service creates multiple PDN connections. However, in the prior art, the creation of a PDN connection is initiated by the terminal, that is, the creation of a multi-PDN connection initiated by the network side according to the service may not be implemented in the SAE architecture, and the network side cannot initiate the creation of a service-related multi-PDN connection. , it can not meet the needs of achieving business optimization.

 [8] Summary of the invention

 [9] An embodiment of the present invention provides a method, a device, and a system for establishing a multi-PDN connection, so that the network side can control the process of establishing multiple PDN connections for the terminal.

An embodiment of the present invention provides a method for establishing a multi-PDN connection, including: [11] On the network side, the terminal allocates multiple PDN connection information according to the bearer allocation policy, and creates a multi-PDN connection for the terminal according to the multiple PDN connection information, where the multiple PDN connection information is used to indicate that multiple PDN connections are established for the terminal. Multiple PDN connection creation instructions.

 [12] An embodiment of the present invention provides a policy formulation entity, including:

 [13] a bearer information allocating unit, configured to allocate multiple PDN connection information to the terminal according to a predetermined bearer allocation policy in the network;

 [14] The bearer information sending unit is configured to transmit the multiple PDN connection information allocated by the bearer information assigning unit to the policy enforcement entity.

[15] The embodiment of the present invention provides a policy enforcement entity, including:

 [16] The multiple PDN connection information receiving unit is configured to receive the multiple PDN connection information delivered by the policy making entity; [17] the PDN connection creation initiating unit is configured to receive the multiple P according to the multiple PDN connection information receiving unit.

The DN connection information initiates the operation of creating a multi-PDN connection.

An embodiment of the present invention provides a system for establishing a multi-PDN connection for a terminal, including:

[19] A policy formulation entity, configured to determine multiple PDN connection information for a terminal according to a predetermined bearer allocation policy

And sending the multiple PDN connection information;

[20] The policy enforcement entity is configured to create a PDN connection for the terminal according to the multiple PDN connection information sent by the received policy formulation entity.

 [21] The embodiment of the present invention provides a network device for establishing a multi-PDN connection for a terminal, including:

 [22] Multi-PDN connection information distribution unit, configured to allocate multiple PDN connection information to the terminal according to the bearer allocation policy

The multi-PDN connection information includes an indication for indicating that a multi-PDN connection is created for the terminal;

[23] A multi-PDN connection creation unit is configured to create a plurality of PDN connections for the terminal according to the multiple PDN connection information allocated by the multi-PDN connection information distribution unit.

[24] BRIEF DESCRIPTION OF THE DRAWINGS

 [25] Figure 1 is a 3GPP access architecture for non-roaming users;

 [26] Figure 2 is a 3GPP access architecture for roaming users;

 FIG. 3 is a schematic diagram of a processing procedure according to Embodiment 1 of the present invention; FIG.

 FIG. 4 is a schematic diagram of a processing procedure of Embodiment 2 according to an embodiment of the present invention; FIG.

FIG. 5 is a schematic diagram of a processing procedure of Embodiment 3 according to an embodiment of the present invention; FIG. FIG. 6 is a schematic structural diagram of an entity and a system according to an embodiment of the present invention; FIG.

FIG. 7 is a schematic structural diagram of a network device according to an embodiment of the present invention.

[32] Mode for carrying out the invention

 An application scenario of the embodiment of the present invention is as shown in FIG. 1 for a 3GPP access architecture for non-roaming users, and a 3GPP access architecture for roaming users as shown in FIG. 2 . In FIG. 1 and FIG. 2, an MME (Mobility Management Entity), an HSS (Home Subscriber Server), a PCRF (Policy Control and Charging Rules Function) entity, and the like are respectively included.

 [34] wherein, in the specific structure of the 3GPP access architecture for the roaming user, the roaming user can access the hPD N OW (the packet data network gateway of the home location), and can also access the vPDN.

 GW (the packet data network gateway of the visited place), both gateway entities can assign IP addresses to users and provide data services. For the vPCRF (destination policy control and charging rule function) entity, in the process of providing data services for users, it may be necessary to communicate with the hPCRF (Home Policy Control and Charging Rules Function) entity to obtain the user's context. Information, so that the user's data can be managed and controlled in combination with local policies.

 [35] The embodiment of the present invention provides an implementation scheme for initiating a multi-PDN connection establishment process by the network side control, that is, on the network side, the terminal allocates multiple PDN connection information according to the bearer allocation policy, and uses the multi-PDN connection information as the terminal. Create multiple PDN connections. For example, it is possible to actively initiate multi-PDN connection creation by the network in the SAE architecture of the 3GPP system, so as to facilitate the control management of the multi-PDN connection creation by the network side.

 [36] In the embodiment of the present invention, the method may include: assigning, by the policy-making entity in the network, the multi-PDN connection information to the terminal according to the predetermined bearer allocation policy, where the multi-PDN connection information is allowed to create the information of the multiple PDN connection for the terminal, and Transmitting the multiple PDN connection information to the policy enforcement entity; afterwards, the policy enforcement entity may create multiple PDN connections for the terminal according to the received multiple PDN connection information. The multi-PDN connection information needs to include at least a corresponding multi-PDN connection creation indication, and the policy execution entity learns that the multi-PDN connection needs to be created.

[37] The foregoing predetermined bearer allocation policy may be: a rule for allocating multiple PDN connection information according to at least one of a network capability, a service type, and subscription information, that is, in the network, for one or more services. Or a total service including multiple sub-services, which may allocate multiple PDN connection information to the foregoing service according to predetermined parameters (such as network capability, etc.) on the network side, to create multiple PDs for performing the service. The N-connection may include, but is not limited to, a subscription relationship between the visited network and the home network, IP address resource information, and the like, and the service type may include, but is not limited to, an IMS (IP Multimedia Subsystem). Business, internet business, attach (attachment) business, etc.

 [38] Moreover, in order to further manage the established bearer, the multi-PDN connection information may further include: an access service identifier (such as an access point name) that is created by initiating a PDN connection, and usage information of the bearer. At least one of the usage information of the bearer is used to indicate an application scenario of the bearer. The multiple PD N connection creation indication may be included in other multi-PDN connection information. For example, if multiple APN information is set for a certain service, it means that multiple PDN connections are to be created.

 [39] Based on the information contained in the multiple PDN connection information, in the embodiment of the present invention, the process of creating a PDN connection for the terminal may include: the policy enforcement entity separately creates multiple services according to the received multiple PDN connection information. The PDN is connected, and a multi-PDN connection corresponding to the service is established; that is, a multi-PDN connection can be initiated for a service peer to be used for carrying out the service;

 [40] It should be noted that, in the embodiment of the present invention, the policy formulation entity and the policy enforcement entity may also be jointly set in the same network device on the network side, and then, the corresponding network device may directly according to the predetermined bearer. The allocation policy allocates multiple PDN connection information to the terminal, and creates multiple PDN connections for the terminal according to the multiple PDN connection information.

 [41] Further, the implementation process of the network side for creating a multi-PDN connection for the service of the user provided by the embodiment of the present invention may include:

 [42] (1) Strategy formulation

 [43] The policy-making entity in the user's home network formulates the policy for the user, that is, sets the multi-PDN connection information for the user, and the information contained in the multi-PDN connection information may be but not limited to: The service setting, or, for a certain type of service setting, etc.; wherein, the policy making entity may specifically be an HSS (Home Subscriber Server) or a PCRF (Policy and Charging Rules function), and the like;

The multi-PDN connection information may include: a multi-PDN connection creation indication, and optionally, the multiple PDN connection information may further include an APN (access point name) information of the associated associated bearer, and/or a PDN connection. Usage information, for example, how the terminal should use the information of the IP address (that is, the application scenario information corresponding to the IP address), and the like;

[45] (2) Strategy issuance [46] The multi-PDN connection information set by the policy-making entity in the user's home network is sent to the policy enforcement entity.

And the corresponding delivery operation may specifically include:

[47] First, the multi-PDN connection information is sent to the related intermediate service processing entity, where the intermediate service processing entity may be: MME (Mobility Management Entity), PCRF entity or PDN.

 GW (Packet Data Network Gateway), etc.;

[48] After that, the relevant intermediate service processing entity specifically processes the corresponding service, and the corresponding service corresponds to multiple P

The DN connection information is sent to the relevant policy enforcement entity;

[49] Alternatively, the policy making entity may directly transmit the multiple PDN connection information to the policy enforcement entity without the intermediate service processing entity;

[50] In the foregoing process, the peer that sends the multiple PDN connection information may also carry an association identifier, where the association identifier is used to identify a subsequent PDN connection request initiated by the policy enforcement entity. Associated with multiple PDN connection information;

[51] It should be noted that the foregoing service processing entity and the policy execution entity may be separately set or may be set in the same device.

[52] (3) Execution of the strategy

 [53] After receiving the multi-PDN connection information sent by the intermediate service processing entity, the policy enforcement entity initiates a multi-PDN connection creation process to create multiple PDN connections for the terminal;

[54] Optionally, after the policy enforcement entity initiates the creation of the PDN connection, the policy execution entity may choose to carry the associated APN information in step (1) and/or the associated identifier in step (2);

[55] The policy enforcement entity may be: UE, MME or Serving GW (Serving Gateway).

[56] In the foregoing process, the policy-making entity may also directly send the multiple PDN connection information to the policy enforcement entity without passing through the intermediate service processing entity. Therefore, the policy enforcement entity directly according to the received multiple PDNs. The connection information initiates the creation of a corresponding PDN connection.

[57] It can be seen that, through the foregoing processing, the process of creating multiple PDN connections for the terminal can be implemented, so that the network side can initiate a process of creating a service multi-PDN connection for the user.

In order to facilitate the understanding of the embodiments of the present invention, the specific application of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[59] Embodiment 1 [60] In this embodiment, the HSS is used as an entity for formulating a policy, and the MME is used as a policy enforcement entity. The HSS carries multiple PDNs in a service data that is sent to the MME by the user according to the subscription relationship of the visited network. The connection information, according to the multi-PDN connection information, the MME, when it is perceived that the user is or is ready to use the service, initiates a multi-PDN connection creation process.

 [61] The specific processing procedure of this embodiment is shown in FIG. 3, and specifically includes the following steps:

 [62] Step 200: Set a multi-PDN connection creation indication for a certain service of the user on the HSS, and indicate that the policy enforcement entity MME establishes to the vPDN GW and the hPDN respectively.

 GW's PDN connection, and set other multi-PDN connection information;

 [63] Step 201: Perform a user access process. After completing the operations such as the identity verification and the location update, the HSS identifies that the visited network where the user is located can allocate a PDN connection to the user, and therefore, the service for the user is sent to the MME. Sending the multiple PDN connection creation indication, so that the MME can obtain a corresponding indication from the HSS, and create multiple PDN connections after the user initiates related services;

 [64] The HSS may specifically send the multiple PDN connection information to the MME along with other service data, or may send the multiple IP bearer information in other manners;

 [005] Optionally, the multiple PDN connection information in the step may further include at least one of APN information that initiates a PDN connection and usage information of the PDN connection, where the usage information of the PDN connection is: The terminal can obtain the scenario in which the PDN connection is used according to the information. For example, the usage information of the PDN connection may be: specify an IP address as an IP address for signaling, and an IP address is used for FTP (File Transfer Protocol). IP address, an IP address as the address assigned by the visited network, and so on.

 [66] Step 202: The MME identifies that the user triggers the service, and determines that a PDN connection establishment process needs to be initiated for the user.

 [67] Specifically, the MME may receive the request for providing the service by the MME, where the request may be a subsequent service bearer application request (such as a subsequent PDN connection process initiated by the UE); after that, the MME identifies the service applied by the user. The multi-PDN connection creation indication is included in the service data, and according to the multi-PD N connection information of the service, a multi-PDN connection establishment process needs to be initiated for the user to create multiple PDN connections for performing the service.

 [68] Step 203, MME to Serving

GW (Serving Gateway) sends a PDN connection creation request, which may include the APN letter of the bearer in the request Interest rate

 [69] In this step 203, if the MME determines that multiple bearers need to be created, the MME needs to separately send multiple PDN connection creation requests to the Serving GW (refer to step 203a), and include the APN information corresponding to each bearer in the request. To establish multiple PDN connections;

 [70] After that, the bearer creation process of step 204a to step 208a and the bearer creation process of step 204 to step 208a are respectively performed, and the execution order between the two bearer creation processes is not limited, such as two bearer creation processes. It can be executed in parallel or in other execution modes. The steps involved in the two bearer creation processes are as follows:

 [71] (1) The bearer creation process of step 204a to step 208a includes:

 [72] Step 204a, the Serving GW sends a PDN connection creation request to the hPDN GW to initiate to hPDN.

The creation of the bearer of the GW, and steps 205a, 206a are performed.

[73] Steps 205a, 206a, hPDN

 The GW acquires the bearer-related policy and charging rule from the policy server hPCRF of the home location, and performs steps.

207a.

 [74] Step 207a, after the hPDN GW obtains the corresponding policy and charging rules, Serving

 The GW returns a bearer creation response message, and performs step 208a;

[75] Step 208a, Serving

 After receiving the bearer creation response of step 207a, the GW continues to return the bearer creation response to the MME, and proceeds to step 211.

 [76] (2) The process of creating a bearer from step 204 to step 210 includes:

 [77] Step 204, the Serving GW sends a PDN connection creation request to the vPDN GW to initiate to the vPDN.

The creation of the bearer of the GW, and steps 205 to 208 are performed.

[78] Steps 205, 206, 207, 208, vPDN

 The GW obtains the bearer-related policy and charging rules from the policy server hPCRF and the vPCRF of the home network and the visited network, and performs step 209;

[79] Step 209, after obtaining the corresponding policy and charging rule, the vPDN GW sends Serving

 The GW returns a bearer creation response message, and performs step 210;

[80] Step 210, Serving After receiving the bearer creation response of step 209, the GW continues to return the bearer creation response to the MME, and proceeds to step 211;

 [81] Step 211: After receiving the foregoing two bearer creation responses, the MME sends a message to the user.

[82] Optionally, the message sent to the user may include one of an association identifier for indicating an association relationship of the two PDN connections, how the terminal uses usage information of each PDN connection, and one of APN information related to the PDN connection. Item or multiple items, so that the terminal can select to use each PDN connection created according to the information, where the information about how the terminal uses the PDN connection may be: specify an IP address that can be used for signaling, or specify The IP address of the FTP operation, or, the IP address specified as the address of the visited place, and so on.

[83] Example 2

 In this embodiment, the PCRF is used as an entity for formulating a policy. After the user initiates the IMS service, the multi-bearer creation process needs to be initiated. The PCRF may perform the decision processing after receiving the application for the user to initiate the IMS service. If it is determined that the user needs to use the visited PDN connection, the PCRF initiates an activation process of the visited PDN connection.

 [85] The specific processing procedure of the corresponding embodiment is as shown in FIG. 4, and specifically includes:

[86] Step 301: The user carries the APN information to initiate an application for the PDN connection;

[87] Step 302: After receiving the request for the bearer application of the user, the MME sends Serving

 The GW initiates a bearer application request;

[88] Step 303, after receiving the request, the Serving GW sends an hPDN to the home network.

 The GW initiates a bearer application request;

[89] Step 304, hPDN

 After receiving the request for the bearer application, the GW sends a CCR (Credit-Control-R equest) message to the home policy server, and applies for related policy control and charging rules;

[90] Step 305, Home Location Policy Server hPCRF to hPDN

 GW returns CCA (Credit-Control-Answer

 The credit control response message, the message carries the PDN connection multi-PDN connection creation indication, and the peer may also include other multi-PDN connection information;

[91] Specifically, the hPCRF discovers the user according to the service type requested by the user after receiving the CCR message. Applying for the IMS service, combined with the signing relationship of the roaming area and its ability to determine: In order to support the reality of the media, a PDN connection of the media stream needs to be created for the IMS service of the user, and the hPCRF will be given to the hPD N.

The GW returns a CCA message, and the message carries a multi-PDN connection creation indication PDN connection, to indicate that a PDN connection of the visited location needs to be created for the user, where the CCA message may also include the APN information for creating the visited PDN connection. How the terminal uses the information of the two IP addresses, and may also include an association identifier, such as corrId=12345, for associating the subsequently initiated bearer with the currently created bearer; [92] Steps 306-308, hPCRF passes hPDN in turn. GW, Serving

 The GW and the MME send a response message to the terminal, where the response message carries the multiple PDN connection information;

 [93] Optionally, the response message may further include: an association identifier used to indicate an association relationship between the two PDN connections, and/or information about how the terminal uses the PDN connection (that is, a PDN corresponding to each IP address) Specific application information for the connection), and / or PDN connection related APN information, and so on.

 [94] Steps 309-318, after receiving the response message, the terminal initiates a request for creating a new PDN connection according to the multiple PDN connection information in the response message (ie, establishing a corresponding IP request according to the re-information for the IMS service). PDN connection); after the request is sent to the network side, the network side allocates related resources to the terminal according to the request, to establish a visited PDN connection corresponding to the IMS service;

 [95] Optionally, the request for creating a new PDN connection initiated by the terminal may further carry the bearer-related APN information, and/or the association identifier coirId=12345, wherein the network may be learned according to the association identifier network. The new PDN connection is related to the previous bearer of the terminal.

 [96] Embodiment 3

 [97] In this embodiment, the HSS is used as an entity for formulating a policy, and the MME is used as a policy enforcement entity. The HSS determines whether to create a multi-PDN connection according to the subscription information of the user that initiates the attach procedure, thereby controlling the MME to The user creates a multi-PDN connection. The specific processing procedure provided by this embodiment is shown in FIG. 5, which may include the following steps:

[98] Step 401: The user initiates an attach. After completing the operations such as identity verification and location update, according to the subscription information, the HSS identifies that multiple PDN connections are to be created for the user's attach procedure, so the attach to the MME for the user Sending an indication of creating a multi-PDN connection, so that the MME is the atta of the user Ch creates multiple PDN connections;

[99] Steps 402 to 405, the MME completes the creation process of the first PDN connection;

[100] Steps 406 to 409, the MME completes the creation process of the second PDN connection;

[101] Step 410: The MME returns a response message to the user.

 [102] Through the above processing, the corresponding MME is configured to create a multi-PDN connection for the user.

 [103] It can be seen from the technical solutions provided by the foregoing three embodiments that, in the embodiment of the present invention, the process of creating a multi-PDN connection for the terminal according to the bearer allocation policy control management on the network side is adopted, thereby enabling the network to The flexible adjustment of the predetermined bearer allocation policy enables flexible management of the multi-PDN connection creation process to improve the operational and manageable performance of the network.

The embodiment of the present invention further provides a system for establishing a service-related multi-PDN connection in a network, and the specific implementation structure is as shown in FIG. 6, which may specifically include:

[105] (1) a policy formulation entity, configured to allocate multiple PDN connection information to the terminal according to a predetermined bearer allocation policy, and send the multiple PDN connection information;

[106] The policy formulation entity may specifically include the following processing units:

 [107] a bearer information allocation unit, configured to allocate, by using a predetermined bearer allocation policy, a plurality of PDN connection information in the network, where the meaning of the multiple PDN connection information has been described above, and is not described in detail herein;

[108] The bearer information sending unit is configured to transmit the multiple PDN connection information allocated by the bearer information assigning unit to the policy enforcement entity.

 [109] (2) The policy enforcement entity is configured to: create multiple PDN connections for the terminal according to the received policy to formulate multiple PDN connection information sent by the entity;

[110] The policy enforcement entity may specifically include the following processing units:

 [111] a multi-PDN connection information receiving unit, configured to receive multiple PDN connection information delivered by the policy making entity; [112] a PDN connection creation initiating unit, configured to receive, according to the multiple PDN connection information receiving unit, multiple P

The DN connection information initiates the operation of creating a PDN connection.

The policy enforcement entity in the system provided by the embodiment of the present invention may include: a home subscriber server, and/or a policy control and charging rule entity; the policy enforcement entity includes: a terminal device, a mobility management entity, and/or Or service gateway.

[114] Optionally, the system provided by the embodiment of the present invention may further include an intermediate service processing entity, configured to receive The multi-PDN connection information sent by the policy-making entity is sent to the policy enforcement entity after the service is processed.

[115] The embodiment of the present invention further provides a network device for establishing a multi-PDN connection for a terminal, where the device can be responsible for the operation of allocating and creating multiple PDN connection information, and the specific structure thereof is as shown in FIG. It mainly includes the following units:

 [116] a multi-PDN connection information distribution unit, configured to allocate, by the bearer allocation policy, a plurality of PDN connection information, where the multi-PDN connection information is used as an indication for creating a multi-PDN connection for the terminal;

[117] A multi-PDN connection creation unit is configured to initiate a multi-PDN connection creation process according to the multi-PDN connection information allocated by the multi-PDN connection information distribution unit, thereby creating multiple PDN connections for the terminal.

 [118] In summary, through various embodiments, the network side can perform control management for a process of creating multiple PDN connections for a terminal, thereby facilitating flexible management of a service-based multi-PDN connection creation process in the network. Improves the operational and manageable performance of the network. For example, the embodiment of the present invention may be applied to a 3GPP access architecture for a non-roaming user or a 3GPP access architecture for a roaming user, to solve the problem existing in the prior art, or the embodiment of the present invention may also be applied to a CDMA network. Or in a communication network similar to a CDMA network, and so on.

 Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary hardware platform, and of course, all can be implemented by hardware, but in many cases, the former It is a better implementation. Based on such understanding, all or part of the technical solution of the present invention contributing to the background art may be embodied in the form of a software product, which may be stored in a storage medium such as a ROM/RAM, a magnetic disk, an optical disk, or the like. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention or portions of the embodiments.

 The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of within the technical scope disclosed by the present invention. Changes or substitutions are intended to be included within the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

Claim  [1] A method for establishing a multi-PDN connection, comprising:  On the network side, the terminal allocates multiple PDN connection information according to the bearer allocation policy, and according to the multiple PD The N connection information creates a multi-PDN connection for the terminal, and the multi-PDN connection information includes a multi-PDN connection creation indication for instructing the terminal to create a multi-PDN connection. [2] The method according to claim 1, wherein the method further comprises: presetting the bearer allocation policy on the network side. [3] The method according to claim 1, wherein the step of assigning a plurality of PDN connection information to the terminal according to the bearer allocation policy, and creating a multi-PDN connection for the terminal according to the multi-PDN connection information includes:  The network-side policy-making entity allocates the multi-PDN connection information to the terminal according to the bearer allocation policy, and delivers the multiple PDN connection information to the policy enforcement entity, and the policy enforcement entity creates a multi-PDN connection for the terminal according to the indication;  Or,  The network device allocates multiple PDN connection information according to the bearer allocation policy, and the network device creates a multi-PDN connection for the terminal according to the multi-PDN connection information. [4] The method according to claim 1, wherein the bearer allocation policy comprises: a rule for allocating multiple PDN connection information for a service according to at least one of a network capability, a service type, or subscription information.  [5] The method according to claim 1, wherein the policy formulation entity comprises: at least one of a home subscriber server or a policy and charging rule entity; the policy enforcement entity comprises: a terminal device At least one of a mobility management entity or a service gateway.  [6] The method according to claim 3, wherein the step of transmitting the multiple PDN connection information to the policy enforcement entity comprises:  The policy-making entity sends the multi-PDN connection information to the intermediate service processing entity, and the intermediate service processing entity processes the service, and sends the PDN connection information corresponding to the service to the policy execution entity. [7] The method according to any one of claims 1 to 5, wherein the creating a multi-PD for the terminal The steps of N connection include:  The policy enforcement entity creates multiple PDN connections for the service initiated by the terminal according to the received multiple PDN connection information.  Or,  After the policy enforcement entity establishes at least one PDN connection, it also initiates the operation of creating a PDN connection according to the received multiple PDN connection information. [8] The method according to claim 7, wherein the message delivered in the process of initiating the creation of the PDN connection comprises: an access service identifier corresponding to the PDN connection, and/or The association identifier of the association relationship between bearers. [9] The method according to claim 1, wherein the multi-PDN connection information further includes: at least one of an access service identifier and a PDN connection usage information that are initiated by the PDN connection, where The usage information of the PDN connection is used to indicate an application scenario that carries the identifier. [10] A strategy making entity characterized by comprising:  a bearer information distribution unit, configured to allocate multiple Ps to the terminal according to a predetermined bearer allocation policy in the network DN connection information;  And a bearer information sending unit, configured to deliver the multiple PDN connection information allocated by the bearer information assigning unit to the policy enforcement entity. [11] A policy enforcement entity, comprising:  A multi-PDN connection information receiving unit, configured to receive multiple PDN connection information delivered by a policy-making entity The PDN connection creation initiation unit is configured to initiate an operation of creating a multi-PDN connection according to the multiple PDN connection information received by the multiple PDN connection information receiving unit. [12] A system for establishing a multi-PDN connection for a terminal, comprising:  a policy formulation entity, configured to determine, according to a predetermined bearer allocation policy, multiple PDN connection information for the terminal, and send the multiple PDN connection information;  The policy enforcement entity is configured to create a PDN connection for the terminal according to the multiple PDN connection information sent by the received policy formulation entity. [13] The system according to claim 12, wherein the policy formulation entity comprises: It is at least one of a user server or a policy control and charging rule entity; the policy enforcement entity includes: at least one of a terminal device, a mobility management entity, or a service gateway.  [14] The system according to claim 12 or 13, wherein the system further comprises an intermediate service processing entity, configured to receive the multiple PDN connection information sent by the policy formulation entity, and after processing the service, the service The corresponding multiple PDN connection information is sent to the policy enforcement entity.  [15] A network device for establishing a multi-PDN connection for a terminal, comprising:  a multi-PDN connection information allocating unit, configured to allocate a multi-PDN connection information to the terminal according to the bearer allocation policy, where the multi-PDN connection information includes an indication multi-PDN connection creating unit, configured to create a multi-PDN connection for the terminal, The multi-PDN connection information allocated by the multi-PDN connection information distribution unit is configured to create a plurality of PDN connections for the terminal.  [16] A computer program product, comprising: computer program code, wherein when the computer program code is executed by a computer, the computer program code can cause the computer to execute a claim The steps of any of 1-9.  [17] A computer readable storage medium, wherein the computer stores computer program code When the computer program code is executed by a computer, the computer program code may cause the computer to perform the steps of any one of claims 1-9.