WO2014161319A1

WO2014161319A1 - Method and access network system for implementing separation between control and bearer

Info

Publication number: WO2014161319A1
Application number: PCT/CN2013/087604
Authority: WO
Inventors: 王飞
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-09-16
Filing date: 2013-11-21
Publication date: 2014-10-09
Also published as: CN104469844B; CN104469844A

Abstract

Disclosed is a method for implementing separation between control and bearer. The method is applicable to an access network system. The access network system comprises a wireless access gateway (WAG) server, a package data service node (PDSN), and more than one point-to-point protocol data bearer gateway (PBG). The method comprises: when the WAG server receives a service request sent by a user terminal, selecting a PBG for bearing bearer plane data of a service for the user terminal; instructing the PBG to establish a route between the PBG and the PDSN; and transmitting the bearer plane data of the service relevant to the user terminal through the route between the PBG and the PDSN. Meanwhile, further disclosed is an access network system for implementing separation between control and bearer.

Description

Method for realizing separation of control and bearer and access network system

The present invention relates to communication technologies, and in particular, to a method for implementing control and bearer separation and an access network system. Background technique

At present, China Telecom's wireless broadband service integration, called Code Division Multiple Access (CDMA) + 3G, the 3rd Generation network + WLAN (Wireless Local Area Networks) The abbreviation "C+W" network is a key product for China Telecom to transform from a fixed-line operator to a full-service operator. Users of China Telecom's C+W service can choose which network to use under the coverage of telecom signals.

Figure 1 is a schematic diagram of the existing C+W network architecture. Before the terminal accesses the network, it needs to be authenticated by the wireless access gateway (WAG) server. After accessing the network, the data service is also transmitted. The WAG server forwards data from a packet service data node (PDSN, Package Data Service Node) on the network side. In other words, the WAG server handles both control plane data and bearer plane data.

In China Telecom's C+W network, WAG servers are rare resources, and each province's WAG servers have only one or two; and, when there are two WAG servers, they are divided into primary servers and standby servers, which actually work. Only the primary WAG server works, and the standby WAG server works only when the primary WAG server crashes.

Therefore, when the user's C+W traffic is large, it will inevitably bring a heavy load to the WAG server. When overloaded, the WAG server may face the danger of crashing. Summary of the invention

In view of this, the main purpose of the embodiments of the present invention is to provide a method for implementing control and bearer separation and an access network system, which can reduce the load of the WAG server and improve the stability of the C+W service.

To achieve the above objective, the technical solution of the embodiment of the present invention is implemented as follows:

An embodiment of the present invention provides a method for implementing control and bearer separation, where the method is applied to an access network system, where the access network system includes a wireless access gateway WAG server, a packet service data node PDSN, and one or more point-to-point protocols. The data bearer gateway PBG; the method further includes:

When receiving the service request sent by the user terminal, the WAG server selects, for the user terminal, a PBG that carries bearer plane data of the service;

Notifying the PBG to establish a route between the PBG and the PDSN;

Transmitting plane data of the service related to the user terminal is transmitted through a route between the PBG and the PDSN.

Preferably, the method further includes:

The WAG server notifies the user terminal of the information of the PBG;

And establishing, by the user terminal, a route between the user terminal and the PBG; and transmitting, by the user terminal, a route between the PBG and the bearer plane data of the service related to the user terminal.

Preferably, the method further includes:

When receiving the service termination request sent by the user terminal, the WAG server notifies the PBG to release the route between the PBG and the PDSN.

Preferably, the method further includes:

When the user terminal sends a service termination request, the route between the user terminal and the PBG is released. Preferably, the notifying the PBG to establish a route between the PBG and the PDSN includes:

Sending, by the WAG server, an increase bearer channel request to the PDSN;

The PBG establishes a PBG to PDSN route according to the Internet Protocol IP address information and port information allocated by the PDSN carried in the request for the enhanced bearer channel to the user terminal, and

The WAG server returns the bearer channel identity code assigned to the user terminal by the PBG.

The force of the ID 07|load channel response.

Preferably, the notifying the PBG to release the route between the PBG and the PDSN includes:

Sending, by the WAG server, a request to delete a bearer channel to the PDSN;

The PBG deletes the route from the PBG to the PDSN according to the bearer channel ID carried in the request for deleting the bearer channel, and returns a response of deleting the bearer channel to the WAG server.

The embodiment of the present invention further provides an access network system that implements control and bearer separation, and the access network system includes: a wireless access gateway WAG server, a packet service data node PDSN, and one or more point-to-point protocol data bearer gateways PBG; among them,

The WAG server is configured to: when receiving the service request sent by the user terminal, select a PBG that carries the bearer plane data of the service for the user terminal; and notify the PBG to establish a route between the PBG and the PDSN. ;

The PBG is configured to establish a route between the PBG and the PDSN, and transmit, by using the route between the PBG and the PDSN, bearer plane data of the service related to the user terminal.

Preferably, the WAG server is further configured to notify the user terminal of the information of the PBG, so that the user terminal establishes a route between the user terminal and the PBG.

Preferably, the WAG server is further configured to notify the PBG to release a route between the PBG and the PDSN when receiving a service termination request sent by the user terminal. Preferably, the WAG server is further configured to send an increase bearer channel request to the PDSN;

The PBG is further configured to: establish a PBG-to-PDSN route according to the Internet Protocol IP address information and port information allocated by the PDSN carried in the request to the user terminal, and return the PBG to the WAG server. Adding a bearer channel ID of the bearer channel identity code assigned by the user terminal;

Preferably, the WAG server is further configured to send a delete bearer channel request to the PDSN;

The PBG is further configured to delete a route of the PBG to the PDSN according to the bearer channel ID carried in the request for deleting the bearer channel, and return a response of deleting the bearer channel to the WAG server.

The method for implementing control and bearer separation and the access network system provided by the embodiment of the present invention, the WAG server separates the control plane data from the bearer plane data, and the Point to Point Protocol Bearing Gateway (PBG) is based on the WAG month. The increased bearer channel sent by the server requests to establish a PBG-to-PDSN route. After the user-to-PBG route and the PBG-to-PDSN route are established, the user terminal performs bearer data transmission through the PBG and the PDSN. In this way, by adding PBG to process the bearer plane data, the load of the WAG server is reduced, and the capacity and performance of the WAG server are effectively improved. Since the WAG server only needs to handle the control plane data when the terminal accesses the C+W network, Not only increased the processing power of WAG, but also improved the stability of C+W business. In addition, the number of PBGs can be expanded according to business needs. DRAWINGS

Figure 1 is a schematic diagram of an existing C+W network architecture;

2 is a schematic diagram of an implementation process of a method for implementing control and bearer separation according to an embodiment of the present invention; FIG. 3 is a schematic structural diagram of a structure of an access network system for implementing control and bearer separation according to an embodiment of the present invention; 4 is a schematic structural diagram of an access network system for implementing control and bearer separation according to an embodiment of the present invention; FIG. 5 is a schematic diagram of an authentication process according to an embodiment of the present invention;

FIG. 6 is a schematic flowchart of PPP dialing processing after successful authentication according to an embodiment of the present invention; FIG. 7 is a schematic flowchart of disconnecting PPP dialing processing according to an embodiment of the present invention. detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

In the embodiment of the present invention, in order to implement separation of control and bearer in the C+W network, the user terminal, the WAG server, and the PBG respectively support the following conditions:

1. The user terminal supports the following conditions:

(1) Add/delete local routes to the PBG;

(2) Parsing the private header field in the Invite response (200 OK) message from the WAG server; the message is expressed as:

Pbg-Tunnel : IP4 ; IPaddr=XXX. XXX. XXX. XXX ; Port=XXX ; tunnelID-id=XXX ₀

2. The WAG server supports the following conditions:

(1) sending an add/delete bearer channel request to the PBG;

(2) sending an Invite 200 OK message to the user terminal, and adding a private header field information of the PBG to the Invite 200 OK message;

Specifically, the WAG server encapsulates parameters such as an IP address, a port number, and a bearer channel ID of the PBG application into a private header field, and adds the message to the Invite 200 OK message. The format of the Invite 200 OK message is as follows:

Pbg-Tunnel: IP4; IPaddr=XXX.XXX.XXX.XXX; Port=XXX;

tunnelID-id=XXX ₀

(3) receiving a down-line (Bye) request message sent by the user terminal, and acquiring a bearer channel ID of the current PBG from the offline request message; (4) Carrying TunnellD sends a request to delete the bearer channel to the PBG.

3. PBG support processing:

(1) receiving an increase bearer channel request from the WAG server, and establishing a PBG to PDSN route request according to the Internet Protocol IP address information and port information allocated by the PDSN carried in the bearer channel request to the user terminal; The WAG server returns an increased bearer channel response carrying a bearer channel identity code (ID, IDentity) allocated by the PBG to the user terminal;

(2) Receiving a request for deleting a bearer channel from the WAG server, deleting a route from the PBG to the PDSN according to the bearer channel ID carried in the request for deleting the bearer channel, and returning a response of deleting the bearer channel to the WAG server.

Hereinafter, the present invention will be further described in conjunction with specific embodiments.

2 is a schematic flowchart of an implementation of a method for implementing control and bearer separation according to an embodiment of the present invention. The method is applied to an access network system, where the access network system includes a WAG server, a PDSN, and one or more PBGs; The method for implementing control and bearer separation in this embodiment includes the following steps:

Step 201: When the WAG server receives the service request sent by the user terminal, the PBG that carries the bearer plane data of the service is selected for the user terminal.

Step 202: The PBG is notified to establish a route between the PBG and the PDSN, and the bearer plane data of the service related to the user terminal is transmitted through a route between the PBG and the PDSN.

Preferably, the method further includes:

The WAG server notifies the user terminal of the information of the PBG;

And establishing, by the user terminal, a route between the user terminal and the PBG; and transmitting, by using the route between the user terminal and the PBG, bearer plane data of the service related to the user terminal. Preferably, the method further includes:

Preferably, the method further includes:

When the user terminal sends a service termination request, the route between the user terminal and the PBG is released.

Here, the service termination request generally refers to a Bye request.

Specifically, the notifying the PBG to establish a route between the PBG and the PDSN includes:

Sending, by the WAG server, an increase bearer channel request to the PDSN;

The PBG establishes a PBG to PDSN route according to the IP address information and the port information allocated by the PDSN carried in the request for the user terminal, and returns a bearer channel that the PBG carries the terminal to the WAG server. The increase in ID carries the channel response.

Preferably, before the PBG receives the request for adding a bearer channel sent by the WAG server, the method further includes:

After receiving the Invite message sent by the user equipment, the WAG server initiates a Generic Routing Encapsulation (GRE) tunnel registration request to the PDSN, and requests the PDSN to establish a GRE tunnel.

After completing the establishment of the GRE tunnel, the PDSN returns a GRE tunnel registration response to the WAG server; after receiving the GRE tunnel registration response, the WAG server sends an add bearer channel request to the PBG.

Before the PBG receives the request to delete the bearer channel sent by the WAG server, the method further includes:

After receiving the service termination request message sent by the user terminal, the WAG server obtains the bearer channel ID of the current PBG from the service termination request message, and sends a delete bearer channel to the PBG. Request.

Preferably, after the PBG returns an increased bearer channel response carrying the bearer channel ID allocated by the PBG to the user terminal, the method further includes:

The WAG server returns an Invite success message carrying the private header field information of the PBG to the user terminal;

After receiving the Invite success message, the terminal locally establishes a route from the terminal to the PBG.

Preferably, the private header domain information of the PBG includes at least the following information:

IP address, port number, and 7|channel ID of the PBG;

The private header field information of the PDSN includes at least the following information:

IP address, port number, and flow identifier of the PDSN;

The request to increase the bearer channel includes at least the following information:

WIFI IP and port number, PDSN IP and port;

The GRE tunnel registration response message carries the private header field information of the PDSN.

Preferably, before the WAG server receives the Invite message sent by the user terminal, the method further includes:

The user terminal automatically initiates unified authentication and authentication, and sends an Invite message to the WAG server after the authentication succeeds.

Specifically, the notifying the PBG to release the route between the PBG and the PDSN includes:

Sending, by the WAG server, a request to delete a bearer channel to the PDSN;

FIG. 3 is a schematic structural diagram of a structure of an access network system for implementing control and bearer separation according to an embodiment of the present invention. As shown in FIG. 3, the access network system includes: a WAG server, a PDSN, and a On PBG; among them,

Preferably, the WAG server is further configured to: when receiving the service termination request sent by the user terminal, notify the PBG to release the route between the PBG and the PDSN.

Preferably, the WAG server is further configured to send an increase bearer channel request to the PDSN;

The PBG is further configured to: establish a PBG-to-PDSN route according to the Internet Protocol IP address information and port information allocated by the PDSN carried in the request to the user terminal, and return the PBG to the WAG server. The booster port channel response of the bearer channel ID assigned by the terminal;

FIG. 4 is a schematic structural diagram of an access network system for implementing control and bearer separation according to an embodiment of the present invention. As shown in FIG. 4, the access network system architecture includes: a user terminal, an access node (AP, Access Point), and an interface. Network Authentication, Authorization, and Accounting (AN-AAA, Access Network- Authentication, Accounting, Authorization) server, packet service data node (PDSN, Package Data) Service Node ); where:

An access node, configured to provide a WIFI wireless link for the user terminal;

Here, the access node ensures that the user terminal can access the network side.

The AN-AAA server is configured to provide authentication data and authentication data for the WAG server, and charge the access user.

The PDSN is configured to establish a user terminal Point-to-Point Protocol (PPP) link, transmit a route of the terminal service flow to the service network, and perform charging for the terminal service flow.

The access node, the AN-AAA server, and the PDSN have the same functions as the access network system in the C+W network in the prior art.

In the architecture of the access network system for implementing control and bearer separation in the C+W network, the access network system architecture further includes: a WAG server and one or more PBGs;

The WAG server is configured to separate the control plane data from the bearer plane data; and is further configured to send a request for adding or deleting a bearer channel to the PBG;

The PBG is configured to establish/release a route of the PBG to the PDSN according to the add/delete bearer channel request sent by the WAG server.

That is, the WAG server is configured to process signaling conversion, service differentiation and aggregation, service flow routing, and the like when the terminal accesses the mobile core network, and shields the broadband network from the mobile core network. The PBG is configured to carry PPP service data separated from the WAG server.

Preferably, the system further includes: a local area network switch (LANS), configured to aggregate routes of each PBG, and configured to forward IP packets.

Preferably, the PBG is further configured to:

After receiving the request for the increase of the bearer channel sent by the WAG server, the PBG to the PDSN is established according to the IP address information and the port information allocated by the PDSN carried in the request to the user terminal, and is returned to the WAG server. PBG is the user terminal The assigned 7|load channel ID is increased by 7|load channel response;

After receiving the request to delete the bearer channel sent by the WAG server, the route of the PBG to the PDSN is deleted according to the bearer channel ID carried in the request for deleting the bearer channel, and the response of the bearer channel is deleted from the WAG server.

Preferably, the WAG server is further configured to: after receiving the Invite message sent by the user terminal, initiate a GRE tunnel registration request to the PDSN, requesting the PDSN to establish a GRE tunnel;

Correspondingly, the PDSN is further configured to return a GRE tunnel registration response to the WAG server after the GRE tunnel is established;

The WAG server is further configured to send an boost to the PBG after receiving the GRE tunnel registration response. 7 channel request;

The WAG server is further configured to: after receiving the service termination request message sent by the terminal, obtain the bearer channel ID of the current PBG from the service termination request, and send a request to delete the bearer channel to the PBG.

The WAG server is further configured to: after the PBG returns an increased bearer channel response carrying the bearer channel ID allocated by the PBG to the terminal, return the private header domain information carrying the PDSN and the private header field of the PBG to the terminal. The Invite success message of the information; the terminal is further configured to establish a route from the terminal to the PBG locally after receiving the Invite success message.

IP address, port number, and 7|channel ID of the PBG;

IP address, port number, and stream ID of the PDSN;

WIFI IP and port, PDSN IP and port;

The GRE tunnel registration response message carries the private header domain information of the PDSN. Preferably, the user terminal automatically initiates a unified authentication and authentication before receiving the Invite message sent by the user terminal, and sends an Invite message to the WAG server after the authentication succeeds.

Preferably, the user terminal performs bearer data transmission by using the PBG and the PDSN after the user terminal establishes the route of the user terminal to the PBG and the PBG establishes a PBG to the PDSN.

FIG. 5 is a schematic diagram of an authentication process according to an embodiment of the present invention. As shown in FIG. 5, the process includes the following steps:

Step 501: The terminal initiates a SIP (Signal) request message to the WAG server.

Specifically, the WIFI switch on the terminal is turned on, scanning the open hotspots around, and automatically connecting to the hotspot with higher priority, and then automatically sending a Register request message to the WAG server through the WIFI link.

Here, suppose that the terminal scans to three open hotspots, according to the order of priority: ChinaNet_HomeCW, ChinaNet_CW, ChinaNet, then the terminal will automatically connect to the highest priority ChinaNet_HomeCW hotspot.

Here, the register request message of the SIP signaling carries the type of the authentication algorithm supported by the user identity card of the terminal. For example, the authentication algorithm may be a Cellular Authentication and Voice Encryption Algorithm (CAVE) or a Message Digest Algorithm 5 (MD5).

Step 502: After receiving the Register request message sent by the terminal, the WAG server selects an algorithm carried in the Register request message, and then returns an Unauthorized challenge message to the terminal.

Here, the Unauthorized challenge message carries an authentication random number corresponding to the WAG selected authentication algorithm. Step 503: After receiving the Unauthorized challenge message, the terminal parses the authentication random number from the Unauthorized challenge message, and calculates the authentication data according to the agreed authentication algorithm by the user identity card of the terminal. After the authentication data is calculated, the Register request message is re-initiated to the WAG server.

Here, the Register Request message initiated to the WAG server carries both the authentication random number and the calculated authentication data.

Step 504 to step 505: After receiving the Register request message re-initiated by the terminal, the WAG server parses out the authentication random number and the authentication data, and sends the authentication random number, the authentication data, and the authentication algorithm. Go to the AN-AAA server for authentication.

Step 506: After receiving the authentication data sent by the WAG server, the AN-AAA server calculates the authentication data according to the authentication algorithm according to the authentication random number.

Specifically, if the authentication data calculated by the AN-AAA server is consistent with the authentication data calculated by the terminal, the authentication success message is returned to the WAG server, indicating that the authentication succeeds; if not, the authentication failure message is returned.

Step 507 to step 508: After receiving the authentication response message sent by the AN-AAA server, the WAG server returns the authentication response message to the terminal.

Here, after receiving the authentication response message, the terminal presents the authentication result to the user in the form of a dialog box or a voice.

Here, after the terminal receives the authentication success response message, that is, after the authentication succeeds, the PPP dialing process flow as shown in FIG. 6 can be performed.

FIG. 6 is a schematic flowchart of PPP dialing processing after successful authentication according to an embodiment of the present invention. As shown in FIG. 6, the process includes the following steps:

Step 601: The terminal initiates an Invite message to the WAG server.

After the authentication succeeds, the user can initiate an invite message to the WAG server by triggering the client or opening a data switch. Step 602 to step 603: After receiving the Invite message sent by the terminal, the WAG server returns a tring response message to the terminal, and initiates a GRE tunnel registration request (Register Req) message to the PDSN to request the PDSN to establish a GRE tunnel of the A10 interface. .

Step 604: After successfully establishing the GRE tunnel of the A10 interface, the PDSN returns a GRE tunnel registration reply (Register Reply) message to the WAG server.

Step 605: After receiving the Register Reply message sent by the PDSN, the WAG server sends a Tunnel Establish Req message to the PBG.

Here, the bearer channel setup request message carries the IP address and port information of the WIFI, the IP address and port information of the PDSN.

Step 606 to Step 607: After receiving the bearer channel setup request message sent by the WAG server, the PBG performs the following operations:

(1) Establishing a PBG to PDSN route locally by using the IP and port of the PDSN;

(2) Return a Tunnel Establish Reply message to the WAG server.

The tunnel Establish Reply message carries the channel ID information.

Step 608: After receiving the bearer channel setup response message sent by the PBG, the WAG server returns an invite success message to the terminal.

Here, the message carries the GRE tunnel parameter allocated by the PDSN for the terminal: IP + Port

+ Stream ID.

Step 609 to Step 610: After receiving the invite success response message returned by the WAG server, the terminal performs the following operations:

(1) using the IP and port number of the channel allocated by the PBG to add a route from the UE to the PBG in the routing table;

(2) Start the PPP dialup process and initiate a PPP dialing negotiation request message to the PBG.

Here, the parameters configured by the terminal for the PPP dialup process include: the IP and port number of the PBG, And the flow identification of the PDSN.

Step 611: After receiving the PPP dialing negotiation request sent by the terminal, the PBG finds the corresponding channel according to the IP address and the port number, and forwards the PPP dialing negotiation request message to the PDSN.

Step 612 to step 613: The PDSN returns a PPP dial-up negotiation response to the terminal through the PBG,

Here, after the PDSN returns a PPP dialing negotiation response message to the terminal, the identity security authentication may be performed by using a Challenge Handshake Authentication Protocol (CHP).

The CHAP is a 3-way handshake authentication protocol in the prior art, and does not directly transmit the user's plaintext password, and provides a secure identity verification by using the MD5 and the corresponding mechanism of the challenge.

After the PPP channel is successfully established, the terminal performs data services through the established PPP channel.

FIG. 7 is a schematic diagram of a process for disconnecting a PPP dialing process according to an embodiment of the present invention. As shown in FIG. 7, the process includes the following steps:

Step 701: The terminal initiates a Terminate Req message to the PBG. Here, when the terminal no longer performs service data transmission, the terminal closes the data switch and sends a Terminate Req request to the PBG.

Step 702: The PBG forwards the termination request message sent by the terminal to the PDSN.

Step 703 to step 704: After receiving the termination request message, the PDSN releases the Stream ID allocated to the terminal locally, and returns a Terminate Ack message to the terminal through the PBG. Steps 705 to 706: After the terminal waits for the set duration Terminating the connection; then initiating a Downe Req message to the WAG server;

Here, the set duration may be set according to actual conditions, for example, may be set to 2s.

Here, the Bye Req message carries an X-CT-Tunnel and a Pbg-timnel.

Here, the X-CT-Tunnel represents private domain header information of the PDSN; and the Pbg-tunnel represents private domain header information of the PBG. Step 707: After receiving the Bye Req message sent by the terminal, the WAG server initiates a GRE tunnel registration request (Unregister Req) message to the PDSN.

Step 708: After receiving the removal registration request message, the PDSN returns a GRE tunnel registration response (Unregister Reply) message to the WAG.

Step 709: After receiving the Unregister Reply message sent by the PDSN, the WAG server initiates a Tunnel Del Req message to the PBG.

Here, the Tunnel Del Req message carries the channel ID assigned by the PDSN to the terminal. Here, the channel ID, that is, the tunnel ID.

Step 710: Step 711: After receiving the bearer channel deletion request message sent by the WAG server, the PBG deletes the established channel according to the channel ID carried in the request message, and then returns a Tunnel Del Reply message to the WAG server.

Step 712: After receiving the Tunnel Del Reply message sent by the PBG, the WAG server returns a downlink success response message to the terminal.

In the present invention, the terminal may be a terminal, or a tablet computer, or a terminal such as a smart TV. The invention can process the bearer plane data by adding PBG, which not only can reduce the load of the WAG server, but also can effectively improve the capacity and performance of the WAG server, and can also greatly improve the stability of the C+W service.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and scope of the invention are intended to be included within the scope of the invention. Industrial applicability

In the embodiment of the present invention, when receiving the service request sent by the user terminal, the WAG server selects a PBG that carries the bearer plane data of the service for the user terminal, and notifies the PBG to establish a route between the PBG and the PDSN. Transmitting plane data of the service related to the user terminal by using a route between the PBG and the PDSN. So, not only has it been reduced The load of the WAG server effectively improves the capacity and performance of the WAG server, and also improves the stability of the C+W service.

Claims

claims

1. A method for realizing separation of control and bearer. The method is applied to an access network system. The access network system includes a wireless access gateway WAG server, a packet service data node PDSN and more than one point-to-point protocol data bearer gateway PBG. ; The method also includes:

When the WAG server receives the service request sent by the user terminal, it selects the PBG that carries the bearer plane data of the service for the user terminal;

Notify the PBG to establish a route between the PBG and the PDSN;

The bearer plane data of the service related to the user terminal is transmitted through the route between the PBG and the PDSN.

2. The method according to claim 1, wherein the method further includes:

The WAG server notifies the user terminal of the PBG information;

The user terminal establishes a route between the user terminal and the PBG; and transmits the bearer plane data of the service related to the user terminal through the route between the user terminal and the PBG.

3. The method according to claim 1, wherein the method further includes:

When the WAG server receives the service termination request sent by the user terminal, it notifies the PBG to release the route between the PBG and the PDSN.

4. The method according to claim 2, wherein the method further includes:

5. The method according to claim 1, wherein the notifying the PBG to establish a route between the PBG and the PDSN includes:

The WAG server sends a request to add a bearer channel to the PDSN;

The PBG establishes a route from the PBG to the PDSN based on the Internet protocol IP address information and port information allocated by the PDSN to the user terminal carried in the add bearer channel request, and sends The WAG server returns a bearer channel response carrying the bearer channel identification code ID assigned by the PBG to the user terminal.

6. The method according to claim 3, wherein the notifying the PBG to release the route between the PBG and the PDSN includes:

The WAG server sends a delete bearer channel request to the PDSN;

The PBG deletes the route from the PBG to the PDSN based on the bearer channel ID carried in the delete bearer channel request, and returns a delete bearer channel response to the WAG server.

7. An access network system that realizes the separation of control and bearer. The access network system includes: a wireless access gateway WAG server, a packet service data node PDSN and more than one point-to-point protocol data bearer gateway PBG; wherein,

The WAG server is configured to, when receiving a service request sent by a user terminal, select the PBG that carries the bearer plane data of the service for the user terminal; notify the PBG to establish a route between the PBG and the PDSN ;

The PBG is configured to establish a route between the PBG and the PDSN, and transmit bearer plane data of the service related to the user terminal through the route between the PBG and the PDSN.

8. The system according to claim 7, wherein the WAG server is further configured to notify the user terminal of the PBG information, so that the user terminal establishes a route between the user terminal and the PBG. .

9. The system according to claim 7, wherein the WAG server is further configured to, when receiving a service termination request sent by a user terminal, notify the PBG to release the route between the PBG and the PDSN.

10. The system according to claim 7, wherein the WAG server is further configured to send an add bearer channel request to the PDSN;

The PBG is also configured to: based on the PDSN carried in the add bearer channel request, The Internet protocol IP address information and port information allocated by the user terminal establish a route from the PBG to the PDSN, and return to the WAG server an add bearer channel response carrying the bearer channel identification code ID allocated by the PBG for the user terminal.

11. The system according to claim 7, wherein the WAG server is further configured to send a delete bearer channel request to the PDSN;

The PBG is further configured to delete the route from the PBG to the PDSN based on the bearer channel ID carried in the delete bearer channel request, and return a delete bearer channel response to the WAG server.