WO2017071399A1

WO2017071399A1 - Service data transmission method, apparatus, control device and communication system

Info

Publication number: WO2017071399A1
Application number: PCT/CN2016/097522
Authority: WO
Inventors: 王丹; 孙滔; 刘超; 陆璐
Original assignee: 中国移动通信集团公司
Priority date: 2015-10-29
Filing date: 2016-08-31
Publication date: 2017-05-04
Also published as: CN106658478B; CN106658478A

Abstract

Provided are a service data transmission method, apparatus, control device and communication system. The method comprises: receiving a user attach request transmitted by a base station; selecting, according to the user attach request, one data transfer device from a plurality of data transfer devices; and interacting with the selected data transfer device and the base station to carry out uplink and downlink data transmission between a network and user equipment.

Description

Method, device, control device and communication system for transmitting business data

Cross-reference to related applications

The present application claims priority to Chinese Patent Application No. 201510717274.7, filed on Jan. 29, 2015 in

Technical field

The present disclosure relates to the field of wireless communication technologies, and in particular, to a method, an apparatus, a control device, and a communication system for transmitting service data.

Background technique

As shown in FIG. 1 , in the current Long Term Evolution (LTE)/Packet Core Network (EPC) architecture, a plurality of network element devices, such as a mobility management entity (MME), a Policy and Charging Rules Function Unit (PCRF), are included. The home subscriber network (HSS), the service gateway (SGW) and the packet data network gateway (PGW) implement functions such as mobility management, path selection, data forwarding, and charging policy. The control plane signaling when the user initially attaches uses the Wireless Packet Service Tunnel Control Plane (GTP-C) protocol, and the forwarding plane signaling uses the Wireless Packet Service Tunnel User Plane (GTP-U) protocol. The main process of establishing a connection by a user equipment (UE) is as follows:

1. When the UE accesses the network, the base station (eNodeB) sends a connection establishment request message to the MME. The message includes but is not limited to: International Mobile Subscriber Identity (IMSI), service identity, and the like.

2. The MME selects an appropriate SGW and PGW according to the received network access selection (APN) and according to the address resolution of the domain name (DNS) server.

3. A connection is established between the MME and the SGW, and the SGW and the PGW are sequentially established.

4. PGW assigns an IP address to the user.

5. The PGW and the PCRF network element are connected interactively. The PGW provides the user's IP address, APN, bearer quality of service (QoS), etc. to the PCRF network element. The PCRF network element sends the charging policy information and QoS information such as the network access aggregation maximum bit rate (APN-AMBR), the quality of service scale value (QCI), and the address resolution protocol (ARP) to the PGW.

6. The PGW sends a message to the SGW, including but not limited to: a PGW address and a tunnel endpoint. Identification (TEID).

7. The SGW sends a message to the MME, including but not limited to: a PGW address and a TEID, an SGW address, and a TEID.

8. The MME sends a message to the eNodeB, including but not limited to: SGW address and TEID, and an IP address allocated to the UE.

9. The eNodeB delivers the IP address of the UE to the UE.

10. The eNodeB delivers the address and TEID of the eNodeB to the MME.

11. The MME delivers the address and TEID of the eNodeB to the SGW, and opens a data transmission link.

12. The UE performs uplink and downlink data transmission through the eNodeB, the SGW, and the PGW.

Through the establishment of the above connection, the UE can perform uplink and downlink data transmission with the Internet.

It can be seen from the above process that, due to the different control functions of each network element in the EPC architecture in the related art, data forwarding and state control are closely coupled, which is not conducive to rapid network evolution and cost reduction, and each control The signaling between the network elements is frequently transmitted, and the signaling processing time is long.

Summary of the invention

In order to overcome the above problems in the related art, embodiments of the present disclosure provide a method, an apparatus, a control device, and a communication system for transmitting service data, which are capable of selecting a data forwarding device that satisfies a user attachment request, and directly selecting the data. The forwarding device interacts with the base station, which reduces signaling interaction and saves signaling processing time.

In order to solve the above technical problem, the present disclosure adopts the following technical solutions:

According to an aspect of an embodiment of the present disclosure, a method for transmitting service data is provided, including:

Receiving a user attach request sent by the base station;

Selecting one data forwarding device from the plurality of data forwarding devices according to the user attachment request;

And interacting with the selected data forwarding device and the base station, and transmitting uplink and downlink service data between the network and the user equipment.

The user attach request includes: a service identifier of the user equipment;

According to the user attach request, the step of selecting one data forwarding device from the plurality of data forwarding devices includes:

Obtaining a network connection address that is resolved by the domain name server according to the service identifier;

And selecting, according to the network connection address, a data forwarding device that matches the network connection address from the plurality of data forwarding devices.

In the above solution, after the step of selecting a data forwarding device that matches the network connection address from the plurality of data forwarding devices according to the network connection address, the method further includes:

Selecting, from a plurality of data forwarding devices that match the network connection address, a data forwarding device closest to the user device or a data forwarding device with the least load.

In the foregoing solution, the step of performing the transmission of the uplink and downlink service data between the network and the user equipment by the selected data forwarding device and the base station includes:

Selecting an IP address assigned to the user equipment from the selected IP address pool of the data forwarding device;

According to the IP address, uplink and downlink service data is transmitted between the network and the user equipment.

In the above solution, after the step of selecting an IP address allocated to the user equipment from the selected IP address pool of the data forwarding device, the method further includes:

Sending the IP address, the service identifier, and the user identifier information of the user equipment to the database;

Obtaining subscription data, a charging policy, and a service quality assurance policy of the user equipment from the database.

In the above solution, the step of transmitting uplink and downlink service data between the network and the user equipment according to the IP address includes:

Sending a create session request to the data forwarding device;

Receiving an attach receipt message to the base station when receiving the create session response fed back by the data forwarding device according to the create session request;

Receiving data forwarding signaling to the data forwarding device when receiving the attach complete message fed back by the base station, and transmitting, by the data forwarding device and the base station, the server and the user equipment according to the IP address Up and down business data.

Sending a create session request to the data forwarding device;

Sending an attach reception message to the base station;

Receiving a create session response that is forwarded by the data forwarding device according to the create session request;

When receiving the attach complete message fed back by the base station, the data forwarding device and the base station transmit uplink and downlink service data between the server and the user equipment according to the IP address.

In the foregoing solution, the creating a session request includes: the IP address, a tunnel endpoint identifier of a control device, the charging policy, and the quality of service guarantee policy;

The creating a session response includes: a tunnel endpoint identifier of the data forwarding device;

The attachment receiving message includes: an address of the data forwarding device, a tunnel endpoint identifier of the data forwarding device, the IP address, a tunnel endpoint identifier of the control device, and the quality of service guarantee policy;

The attach complete message includes: an address of the base station and a tunnel endpoint identifier;

The data forwarding signaling includes: an address of the base station and a tunnel endpoint identifier.

In the foregoing solution, the creating a session request includes: the IP address, the base station

Address, the charging policy, and the quality of service guarantee policy;

The attach and receive message includes: an address of the data forwarding device, the IP address, and the quality of service guarantee policy.

According to another aspect of the embodiments of the present disclosure, a device for transmitting service data is further provided, including:

a receiving module, configured to receive a user attach request sent by the base station;

a selecting module, configured to select one data forwarding device from the plurality of data forwarding devices according to the user attach request;

The interaction module is configured to interact with the selected data forwarding device and the base station, and perform uplink and downlink service data transmission between the network and the user equipment.

The user attach request includes: a service identifier of the user equipment;

The selection module includes:

An obtaining unit, configured to obtain a network connection address that is resolved by the domain name server according to the service identifier;

And a first selecting unit, configured to select, according to the network connection address, a data forwarding device that matches the network connection address from the plurality of data forwarding devices.

Wherein, in the above solution, the selecting module further includes:

And a second selecting unit, configured to select, from a plurality of data forwarding devices that match the network connection address, a data forwarding device closest to the user device or a data forwarding device with the least load.

The interaction module includes:

An allocating unit, configured to select an IP address allocated to the user equipment from the selected IP address pool of the data forwarding device;

And a transmission unit, configured to perform uplink and downlink service data transmission between the network and the user equipment according to the IP address.

The interaction module further includes:

a sending unit, configured to send the IP address, the service identifier, and the user identifier information of the user equipment to the database;

The receiving unit is configured to obtain subscription data, a charging policy, and a service quality assurance policy of the user equipment from the database.

Wherein, in the above solution, the transmission unit comprises:

a session requesting subunit, configured to send a create session request to the data forwarding device;

An attach request subunit, configured to send an attach and receive message to the base station when receiving the create session response that is sent by the data forwarding device according to the create session request;

a forwarding subunit, configured to send data forwarding signaling to the data forwarding device when receiving the attach complete message fed back by the base station, and transmitting, by the data forwarding device and the base station, according to the IP address Uplink and downlink service data between the server and the user equipment.

Wherein, in the above solution, the transmission unit comprises:

a first sending subunit, configured to send a create session request to the data forwarding device;

a second sending subunit, configured to send an attach and receive message to the base station;

a first receiving subunit, configured to receive a create session response that is sent by the data forwarding device according to the create session request;

a second receiving subunit, configured to: when the receiving the completion message fed back by the base station, the data forwarding device and the base station transmit uplink and downlink service data between the server and the user equipment according to the IP address .

Address, the charging policy, and the quality of service guarantee policy;

According to another aspect of an embodiment of the present disclosure, there is also provided a control device comprising the above-described transmission device for service data.

According to another aspect of an embodiment of the present disclosure, there is also provided a communication system comprising the control device described above.

The beneficial effects of the embodiments of the present disclosure are:

The method for transmitting service data in the embodiment of the present disclosure receives a user attach request sent by the base station, and selects a data forwarding device from the plurality of data forwarding devices according to the user attach request, and directly interacts with the base station through the selected data forwarding device. Thereby, the uplink and downlink service data transmission between the network and the user equipment is implemented. Therefore, the service data transmission method of the embodiment of the present disclosure reduces signaling interaction and saves signaling processing time.

DRAWINGS

1 is a block diagram showing an EPC communication system in the related art;

2 is a block diagram showing an EPC communication system involved in a service data transmission method according to an embodiment of the present disclosure;

FIG. 3 is a flowchart of a service data transmission method according to an embodiment of the present disclosure;

4 is a block diagram showing the structure of a service data transmission apparatus of at least some embodiments of the present disclosure;

FIG. 5 is a block diagram showing the structure of a service data transmission apparatus according to at least some embodiments of the present disclosure;

6 is a schematic diagram showing an implementation flow of a service data transmission method using a GTP protocol according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram showing an implementation flow of an IP-based openflow protocol in a service data transmission method according to an embodiment of the present disclosure.

detailed description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the embodiments of the present invention have been shown in the drawings, the embodiments Rather, these embodiments are provided so that this disclosure will be more fully understood and the scope of the disclosure will be fully disclosed.

According to an aspect of an embodiment of the present disclosure, a service data transmission method is provided, which is applied to an EPC network after a control plane device is fused. As shown in FIG. 2, the EPC network architecture separates the control plane and the forwarding plane in the network element, and the control plane device re-converges to become a control device with overall network control capability, and uses general forwarding in the network as needed. The device (ie, the data forwarding device DGW shown in FIG. 2) simplifies network deployment, thereby implementing unified control of the forwarding plane device, thereby implementing faster control plane signaling processing, saving forwarding time, and reducing delay.

The method is applied to the control device shown in FIG. 2, the control device first receives a user attach request sent by the base station; and then, according to the user attach request, selects a data forwarding device from the plurality of data forwarding devices; and finally, The selected data forwarding device interacts with the base station to perform uplink and downlink service data transmission between the network and the user equipment. Therefore, in the method for transmitting service data of the embodiment of the present disclosure, the control device selects a data forwarding device that satisfies the user attachment request, and directly interacts with the selected data forwarding device and the base station, thereby reducing signaling interaction and saving signaling processing. time.

As shown in FIG. 3, the method includes:

Step S31: Receive a user attach request sent by the base station.

The user attach request includes: a service identifier of the user equipment. It is to be understood that the specific information carried in the user attachment request is not limited thereto. For example, the IMSI of the user equipment may also be carried.

In addition, the user equipment needs to be initially attached before performing the actual service. Therefore, the user equipment sends a user attach request to the control device through the base station. Therefore, the user attach request received by the control device is sent by the user equipment forwarded by the base station to the base station.

Step S33: Select one number from multiple data forwarding devices according to the user attachment request. According to the forwarding device.

In the EPC architecture after the control plane device is fused, one control device can control multiple data forwarding devices, and multiple data forwarding devices are respectively connected to different networks, such as a local area network, a metropolitan area network, or a wide area network. Therefore, when a user equipment initiates a user attach request, the control device needs to know which network the user equipment needs to connect to. The network type of the connection is generally related to the service to be performed by the user equipment. Therefore, the control device selects an available data forwarding from the plurality of data forwarding devices according to the service identifier of the user equipment carried in the user attachment request. device.

Wherein, the available data forwarding device needs to match the network to which the user equipment is to be connected. Therefore, step S33 includes:

In order to make the load of each data forwarding device in the EPC network assume a balanced state or make the network run more smoothly, a data that is closest to the user equipment may be further selected from a plurality of data forwarding devices that match the network connection address. Forwarding device or a data-loading device with the least load.

Step S35: Perform interaction with the selected data forwarding device and the base station, and perform uplink and downlink service data transmission between the network and the user equipment.

In an EPC network, different user equipments perform corresponding services and correspond to different IP addresses. An address pool is configured on the control device in the EPC network architecture, and the control device is responsible for allocating the IP address of the user equipment. Therefore, after the data forwarding device that meets the service requirements of the user equipment is selected, the control device selects one of the IP address pools corresponding to the selected data forwarding device to be assigned to the user equipment, and then allocates the user equipment according to the user equipment. The IP address is used to transmit uplink and downlink service data between the network and the user equipment.

In addition, when the user equipment performs the uplink and downlink data transmission between the base station and the data forwarding device and the network, the base station needs to know the quality of service guarantee policy corresponding to the user equipment, and the data forwarding device needs to know the charging policy and the service quality assurance policy. Therefore, after the IP address is assigned to the user equipment, the IP address, the service identifier, and the IMSI of the user equipment are also sent to the database. The database can be used to search for the subscription data, the charging policy, and the service quality assurance policy corresponding to the user equipment, and deliver the information to the control device.

After the control device obtains the subscription information, the charging policy, and the service quality assurance policy of the user equipment, the control device saves the subscription information, and sends the charging policy and the service quality assurance policy to the data forwarding device to deliver the service quality assurance policy. The base station is configured to enable the data forwarding device to perform the charging policy, perform the traffic statistics, the duration statistics, and report the measurement records to the control device according to the charging policy. The fee measurement information is collected, and the CDR is generated and then reported to the corresponding network element.

According to the IP address, in the process of transmitting uplink and downlink service data between the network and the user equipment, it is mainly required to establish a session between the control device and the data forwarding device, and implement connection with the base station, and finally open up and downlink data. Transmission link. Therefore, the control device may send the charging policy and the QoS policy as the carrying information of the corresponding signaling to the data forwarding device in the process of creating a session with the data forwarding device, and in the process of attaching to the base station, The service quality assurance policy is sent to the base station as the carrying information of the corresponding signaling.

In addition, since the control plane device of the EPC network is fused, the protocol between the control device and the data forwarding device may adopt a general wireless packet service tunnel (GTP) protocol, or an IP-based openflow protocol.

When the GTP protocol is adopted between the control device and the data forwarding device, the step of transmitting uplink and downlink service data between the network and the user equipment according to the IP address includes:

Sending a create session request to the data forwarding device;

The creating a session request includes: the IP address, a tunnel endpoint identifier of the control device, the charging policy, and the quality of service guarantee policy; the creating a session response includes: a tunnel endpoint of the data forwarding device The identifier includes: an address of the data forwarding device, a tunnel endpoint identifier of the data forwarding device, the IP address, and the control device The tunnel end identifier and the quality of service guarantee policy; the attach complete message includes: an address of the base station and a tunnel end identifier; and the data forwarding signaling includes: an address of the base station and a tunnel end identifier.

The first device needs to carry the TEID of the first device, so that the second device can reply to the first device according to the TEID of the first device, of course, the first device can send the signaling information to the second device. When the second device replies with the information, it also needs to carry the TEID of the second device. Therefore, in the foregoing process, any network element carries a corresponding TED when transmitting corresponding signaling to another network element.

In addition, compared with the prior art, in the process of opening up the uplink and downlink data transmission links, the service data transmission method in the embodiment of the present disclosure mainly involves only two network elements, namely the control device and the data forwarding device, and the TEID of the data forwarding device. And the address information only needs to notify the control device, corresponding to the flow in the prior art, the PGW will pass its own TEID and address to the SGW. The SGW shall forward its own TEID and address, the TEID and address of the PGW to the MME. Therefore, the service data transmission method of the embodiment of the present invention involves fewer network elements, and greatly reduces signaling transmission and reduces network load.

When the IP-based openflow protocol is adopted between the control device and the data forwarding device, the step of transmitting uplink and downlink service data between the network and the user equipment according to the IP address includes:

Sending a create session request to the data forwarding device;

Sending an attach reception message to the base station;

The creating a session request includes: the IP address, an address of the base station, and the

a charging policy and the service quality assurance policy;

The IP-based openflow protocol does not have a tunnel packet mechanism. The related signaling information involved in the foregoing process does not need to carry the TEID of the sender network element. Under the IP-based openflow protocol, the control device knows the address of the base station. And the address of the data forwarding device, and request to create a session, that is, the control device informs the data forwarding device of the address of the base station; requesting attachment is control The device informs the base station of the address of the data forwarding device; finally, the uplink and downlink data transmission link is opened, that is, the base station knows the address of the data forwarding device, and the data forwarding device knows the address of the base station. Therefore, the step of requesting the control device to create a session to the data forwarding device and the control device requesting the attachment to the base station can be performed simultaneously, and when the base station informs the control device that the attachment is successful, the control device is no longer required to notify the address of the base station to the data forwarding. device.

In summary, when the protocol between the control device and the data forwarding device adopts the GTP protocol, the implementation method of the service data transmission method in the embodiment of the present invention is as shown in FIG. 6 in the EPC network architecture after the control plane device is merged. :

601. The user equipment sends an attach request to the control device by using a base station (eNodeB), where the message includes, but is not limited to, an IMSI, a service identifier, and the like.

602. The controller filters out the available data forwarding device (DGW) according to the service identifier and the address resolution of the domain name server, and the controller selects an appropriate DGW for the UE according to the load condition of the DGW, and allocates a corresponding IP address.

603. The Controller provides a UE with a UE IP address, a service identifier, an IMSI, and the like to request data from the database.

604. The database sends information to the controller, including but not limited to: subscription data, a charging policy, and a quality of service (QoS) protection policy;

605. The controller sends a Create session request to the DGW, where the signaling includes, but is not limited to, a UE IP address, a Controller TEID, a QoS information, a charging policy, and the like.

606. The DGW sends a Create Session Response to the Controller, where the signaling includes, but is not limited to, a DGW TEID, and the like.

607. The controller sends an attach request to the eNodeB. The signaling includes, but is not limited to, an address of the DGW, a DGW TEID, a UE IP address, a controller TEID, and QoS information.

608. The eNodeB sends an attach complete message to the controller, where the signaling includes, but is not limited to, an eNodeB TEID, an address of the eNodeB, and the like.

609. The controller sends signaling to the DGW, where the signaling includes, but is not limited to, an eNodeB TEID, an address of the eNodeB, and the like.

610. The eNodeB will receive the IP address of the UE, the address of the eNodeB, and the TEID, DGW. The address and TEID are sent to the UE. The UE performs uplink and downlink data transmission with the Internet through the eNodeB and the DGW.

When the protocol between the control device and the data forwarding device adopts the IP-based openflow protocol, the implementation method of the service data transmission method in the embodiment of the present invention is as shown in FIG. 7 in the EPC network architecture after the control plane device is merged:

701. The user equipment sends an attach request to the controller through the eNodeB. The message includes but is not limited to an IMSI, a service identifier, etc.

702. The controller filters out the available DGW according to the service identifier and the address resolution of the domain name server, and the controller selects an appropriate DGW for the UE according to the load condition of the DGW, and allocates a corresponding IP address.

703. The Controller provides a UE IP address, a service identifier, an IMSI, and the like to the database to request data.

704. The database sends information to the controller, including but not limited to: subscription data, a charging policy, and a QoS guarantee policy.

705. The Controller sends a Create session request to the DGW. The signaling includes but is not limited to: UE IP address, eNodeB address, QoS information, and charging information.

706. The DGW sends a Create session response to the Controller.

707. The Controller sends an Attach accept to the eNodeB. The signaling includes but is not limited to: an address of the DGW, a UE IP address, QoS information, and the like;

708. The eNodeB sends an Attach complete message to the controller.

709. The eNodeB sends the received IP address of the UE, the address of the eNodeB, and the address of the DGW to the UE. The UE performs uplink and downlink data transmission with the Internet through the eNodeB and the DGW.

According to another aspect of the embodiments of the present disclosure, a service data transmission apparatus is further provided. As shown in FIG. 4, the apparatus 400 includes:

The receiving module 401 is configured to receive a user attach request sent by the base station;

The selecting module 403 is configured to select one data forwarding device from the plurality of data forwarding devices according to the user attach request;

The interaction module 405 is configured to interact with the selected data forwarding device and the base station, and perform uplink and downlink service data transmission between the network and the user equipment.

Optionally, the user attach request includes: a service identifier of the user equipment;

The selection module 403 includes:

The obtaining unit 4031 is configured to obtain a network connection address that is resolved by the domain name server according to the service identifier.

The first selecting unit 4032 is configured to select, according to the network connection address, a data forwarding device that matches the network connection address from the plurality of data forwarding devices.

Optionally, the selecting module 403 further includes:

The second selecting unit 4033 is configured to select, from among a plurality of data forwarding devices that match the network connection address, a data forwarding device closest to the user equipment or a data forwarding device with the least load.

Optionally, the interaction module 405 includes:

The allocating unit 4051 is configured to select an IP address allocated to the user equipment from the selected IP address pool of the data forwarding device;

The transmitting unit 4052 is configured to perform uplink and downlink service data transmission between the network and the user equipment according to the IP address.

Optionally, the interaction module 405 further includes:

The sending unit 4053 is configured to send the IP address, the service identifier, and the user identifier information of the user equipment to the database;

The receiving unit 4054 is configured to obtain the subscription data, the charging policy, and the service quality assurance policy of the user equipment from the database.

Optionally, the transmitting unit 4052 includes:

a session requesting sub-unit 40521, configured to send a create session request to the data forwarding device;

The attach request sub-unit 40522 is configured to send an attach and receive message to the base station when receiving the create session response fed back by the data forwarding device according to the create session request;

The forwarding subunit 40523 is configured to: when receiving the attach complete message fed back by the base station, send data forwarding signaling to the data forwarding device, and the data forwarding device and the base station transmit according to the IP address The uplink and downlink service data between the server and the user equipment.

Optionally, the creating a session request includes: the IP address, a tunnel endpoint identifier of a control device, the charging policy, and the quality of service guarantee policy;

According to another aspect of the embodiments of the present disclosure, a service data transmission apparatus is further provided. As shown in FIG. 5, the apparatus 400 includes:

The selection module 403 includes:

The selecting unit 4032 is configured to select, according to the network connection address, a data forwarding device that matches the network connection address from the plurality of data forwarding devices.

Optionally, the selecting module 403 further includes:

Optionally, the interaction module 405 includes:

Optionally, the interaction module 405 further includes:

Optionally, the transmitting unit 4052 includes:

a first sending subunit 40524, configured to send a create session request to the data forwarding device;

a second sending subunit 40525, configured to send an attach and receive message to the base station;

a first receiving sub-unit 40526, configured to receive a create session response that is sent by the data forwarding device according to the create session request;

a second receiving sub-unit 40527, configured to: when receiving the attach complete message fed back by the base station, the data forwarding device and the base station transmit an uplink and downlink service between the server and the user equipment according to the IP address data.

Optionally, the creating a session request includes: the IP address, an address of the base station, the charging policy, and the quality of service guarantee policy;

According to another aspect of an embodiment of the present disclosure, there is also provided a control device comprising the above described service data transmission device.

According to another aspect of an embodiment of the present disclosure, there is also provided a communication system comprising the control device described above. The communication system can be, for example, a packet core network (EPC) communication system.

The above is a preferred embodiment of the present disclosure, and it should be noted that those skilled in the art can also make several improvements and refinements without departing from the principles of the present disclosure. Within the scope of public protection.

Claims

A method for transmitting business data, comprising:

Receiving a user attach request sent by the base station;

Selecting one data forwarding device from the plurality of data forwarding devices according to the user attachment request;

And interacting with the selected data forwarding device and the base station, and transmitting uplink and downlink service data between the network and the user equipment.
The method for transmitting service data according to claim 1, wherein the user attachment request comprises: a service identifier of the user equipment;

According to the user attach request, the step of selecting one data forwarding device from the plurality of data forwarding devices includes:

Obtaining a network connection address that is resolved by the domain name server according to the service identifier;

And selecting, according to the network connection address, a data forwarding device that matches the network connection address from the plurality of data forwarding devices.
The method for transmitting service data according to claim 2, wherein after the step of selecting a data forwarding device matching the network connection address from the plurality of data forwarding devices according to the network connection address, The method also includes:

Selecting, from a plurality of data forwarding devices that match the network connection address, a data forwarding device closest to the user device or a data forwarding device with the least load.
The method for transmitting service data according to claim 1, wherein the step of performing uplink and downlink service data transmission between the network and the user equipment by interacting with the selected data forwarding device and the base station comprises:

Selecting an IP address assigned to the user equipment from the selected IP address pool of the data forwarding device;

According to the IP address, uplink and downlink service data is transmitted between the network and the user equipment.
The method for transmitting service data according to claim 4, wherein the step of selecting an IP address assigned to the user equipment from the selected IP address pool of the data forwarding device further comprises:

Sending the IP address, the service identifier, and the user identifier information of the user equipment to the database;

Obtaining subscription data, a charging policy, and a service quality assurance policy of the user equipment from the database.
The method for transmitting service data according to claim 5, wherein the step of transmitting uplink and downlink service data between the network and the user equipment according to the IP address comprises:

Sending a create session request to the data forwarding device;

Receiving an attach receipt message to the base station when receiving the create session response fed back by the data forwarding device according to the create session request;

Receiving data forwarding signaling to the data forwarding device when receiving the attach complete message fed back by the base station, and transmitting, by the data forwarding device and the base station, the server and the user equipment according to the IP address Up and down business data.
The method for transmitting service data according to claim 5, wherein the step of transmitting uplink and downlink service data between the network and the user equipment according to the IP address comprises:

Sending a create session request to the data forwarding device;

Sending an attach reception message to the base station;

Receiving a create session response that is forwarded by the data forwarding device according to the create session request;

When receiving the attach complete message fed back by the base station, the data forwarding device and the base station transmit uplink and downlink service data between the server and the user equipment according to the IP address.
The method of transmitting service data according to claim 6, wherein

The creating a session request includes: the IP address, a tunnel endpoint identifier of the control device, the charging policy, and the quality of service guarantee policy;

The creating a session response includes: a tunnel endpoint identifier of the data forwarding device;

The attachment receiving message includes: an address of the data forwarding device, a tunnel endpoint identifier of the data forwarding device, the IP address, a tunnel endpoint identifier of the control device, and the quality of service guarantee policy;

The attach complete message includes: an address of the base station and a tunnel endpoint identifier;

The data forwarding signaling includes: an address of the base station and a tunnel endpoint identifier.
The method of transmitting service data according to claim 7, wherein

The creating a session request includes: the IP address, an address of the base station, the charging policy, and the quality of service guarantee policy;

The attach and receive message includes: an address of the data forwarding device, the IP address, and the quality of service guarantee policy.
A transmission device for business data, comprising:

a receiving module, configured to receive a user attach request sent by the base station;

a selecting module, configured to select one data forwarding device from the plurality of data forwarding devices according to the user attach request;

The interaction module is configured to interact with the selected data forwarding device and the base station, and perform uplink and downlink service data transmission between the network and the user equipment.
The apparatus for transmitting service data according to claim 10, wherein the user attachment request comprises: a service identifier of the user equipment;

The selection module includes:

Obtaining a unit, acquiring a network connection address that is resolved by the domain name server according to the service identifier;

And a first selecting unit, configured to select, according to the network connection address, a data forwarding device that matches the network connection address from the plurality of data forwarding devices.
The apparatus for transmitting service data according to claim 11, wherein the selection module further comprises:

And a second selecting unit, configured to select, from a plurality of data forwarding devices that match the network connection address, a data forwarding device closest to the user device or a data forwarding device with the least load.
The service data transmission device of claim 10, wherein the interaction module comprises:

An allocating unit, configured to select an IP address allocated to the user equipment from the selected IP address pool of the data forwarding device;

And a transmission unit, configured to perform uplink and downlink service data transmission between the network and the user equipment according to the IP address.
The apparatus for transmitting service data according to claim 13, wherein the interaction module further comprises:

a sending unit, configured to send the IP address, the service identifier, and the user identifier information of the user equipment to the database;

a receiving unit, configured to acquire subscription data and a charging policy of the user equipment from the database Slightly and service quality assurance strategies.
The apparatus for transmitting service data according to claim 14, wherein said transmission unit comprises:

a session requesting subunit, configured to send a create session request to the data forwarding device;

An attach request subunit, configured to send an attach and receive message to the base station when receiving the create session response that is sent by the data forwarding device according to the create session request;

a forwarding subunit, configured to send data forwarding signaling to the data forwarding device when receiving the attach complete message fed back by the base station, and transmitting, by the data forwarding device and the base station, according to the IP address Uplink and downlink service data between the server and the user equipment.
The apparatus for transmitting service data according to claim 14, wherein said transmission unit comprises:

a first sending subunit, configured to send a create session request to the data forwarding device;

a second sending subunit, configured to send an attach and receive message to the base station;

a first receiving subunit, configured to receive a create session response that is sent by the data forwarding device according to the create session request;

a second receiving subunit, configured to: when the receiving the completion message fed back by the base station, the data forwarding device and the base station transmit uplink and downlink service data between the server and the user equipment according to the IP address .
A transmission apparatus for service data according to claim 15, wherein

The creating a session request includes: the IP address, a tunnel endpoint identifier of the control device, the charging policy, and the quality of service guarantee policy;

The creating a session response includes: a tunnel endpoint identifier of the data forwarding device;

The attachment receiving message includes: an address of the data forwarding device, a tunnel endpoint identifier of the data forwarding device, the IP address, a tunnel endpoint identifier of the control device, and the quality of service guarantee policy;

The attach complete message includes: an address of the base station and a tunnel endpoint identifier;

The data forwarding signaling includes: an address of the base station and a tunnel endpoint identifier.
A transmission apparatus for service data according to claim 16, wherein

The creating a session request includes: the IP address, an address of the base station, and the charging policy And the service quality assurance strategy;

The attach and receive message includes: an address of the data forwarding device, the IP address, and the quality of service guarantee policy.
A control device comprising the transmission device for service data according to any one of claims 10 to 18.
A communication system comprising the control device of claim 19.