WO2010072161A1

WO2010072161A1 - Routing method, apparatus and communication system for data exiting a gi interface

Info

Publication number: WO2010072161A1
Application number: PCT/CN2009/075978
Authority: WO
Inventors: 吕欣岩
Original assignee: 华为技术有限公司
Priority date: 2008-12-24
Filing date: 2009-12-24
Publication date: 2010-07-01
Also published as: CN101436991B; CN101436991A

Abstract

The embodiments of the invention provide a routing method for data exiting a Gi interface, the corresponding apparatus and communication system. Wherein, the method includes: establishing a data channel for exiting a Gi interface from a core network and a data channel for exiting the Gi interface from an access point (AP); receiving data transmitted by a terminal; and according to a preset routing table and the destination address of the data, transmitting the data to the next hop network element in one of the two data channels corresponding to the destination address of the data. According to the embodiments of the invention, two data channels are established between the AP and a network side; and according to the path corresponding to the destination address in the preset routing table, the AP in the network side selects one of the two established data channels as a data transmission path. The problem is solved that the same APN used for identifying different services in the prior art can only establish one data channel for exiting the Gi interface, which probably causes the waste of core network resources.

Description

The present invention claims to be submitted to the Chinese Patent Office on December 24, 2008, and the application number is 200810189453. 8. The invention name is "a routing method for data out of the Gi port, The priority of the Chinese patent application of the device and the communication system is hereby incorporated by reference in its entirety. TECHNICAL FIELD The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, and a communication system for routing data out of a Gi port.

Background technique

The Gi port is a reference point between the general packet radio service (GPRS: General Packet Radio Service) network and the packet data network. The data of the terminal carried on the Internet Protocol (IP) network is divided into two types according to the destination address of the data out port: one is to access the Internet Internet service; the other is to access the core network (CN: Core Net ) Services, such as accessing the core network Wireless Application Protocol (WAP) server. In the environment of an access point (AP: Access Point) network, data on the terminal is transmitted to the local area network through the AP, and then transmitted from the local area network to the IP network. If the destination address of the data sent by the terminal is in the core network. The address is sent by the gateway general-purpose wireless packet service support node (GGSN: Gateway GPRS Support Note) to the destination address in the core network. If the destination address of the data sent by the terminal is an address in the Internet, the data is sent by the GGSN out of the Gi port and routed to the destination address in the Internet. The access gateway (AG: Access Gateway) integrates the function of the Service GPRS Support Note (SGSN).

As the technology continues to evolve, it gradually evolves from the AP directly to the Gi port. In this case, the Internet network service and the core network service need to be separated on the AP. When the data sent by the terminal needs to perform the Internet service, the AP directly sends the data to the destination address on the Internet. If the core network service needs to be executed, the data is processed according to the method in which the GGSN sends the data out of the Gi port. The dynamic host allocation protocol DHCP server is configured to allocate an address to the AP and the terminal, and complete the data channel between the local area network and the external network where the AP is located, and the gateway GW carries the communication between the local area network and the external network where the AP is located.

In the prior art, different access point names (APNs) are used to distinguish services. Since APNs can be identifiers of a type of service, some services need to access Internet services and some need to access core network services. The data channel established on the network side can only pass all the services identified by the APN through the GGSN to the Gi port, but cannot establish a data channel directly from the AP to the Gi port; or the data channel established on the network side. The channel can only pass all the services out of the Gi port through the AP, and cannot establish the data channel from the GGSN to the Gi port at the same time. In the prior art, only one data channel of the Gi-port can be established for the same APN of the identified different services, which may result in waste of core network resources.

Summary of the invention

The embodiment of the present invention provides a method, a device, and a communication system for routing data out of a port, and solves the problem that the same APN that identifies different services in the prior art can only establish a data channel of the out port, which may lead to the core. Waste of network resources.

An embodiment of the present invention provides a method for routing data out of a Gi port, including:

Establish a data channel from the core network to the Gi port and a data channel from the access point to the Gi port;

Receiving data sent by the terminal;

Sending, according to the preset routing table and the destination address of the data, the next hop network element in one of the two data channels corresponding to the destination address of the data, where the The routing table includes a correspondence between the destination address and the next hop network element in the at least one data channel.

An embodiment of the present invention further provides an access point AP, including:

a second receiving unit, configured to receive data sent by the terminal;

a determining unit, configured to determine, according to the preset routing table and the destination address of the data, whether the next hop network element corresponding to the destination address of the data is the access gateway AG, and the acquiring unit, configured to acquire the terminal device The mapping between the IP address and the address assigned by the GGSN to the terminal; the processing unit, configured to: when the determining unit determines that the next hop address corresponding to the destination address of the data received by the first receiving unit is AG, according to the obtaining unit Obtaining a mapping relationship between the IP address allocated by the terminal and the address allocated by the GGSN for the terminal, converting the IP address of the data into an address allocated by the GGSN to the terminal; and the second sending unit, configured to: when the determining unit determines When the next hop network element corresponding to the destination address of the data received by the first receiving unit is not an AG, the data is sent to the destination address by using the next hop network element; or, When the next hop network element corresponding to the destination address of the data is the AG, the data of the IP address converted to the address allocated by the GGSN to the terminal is sent to the AG. The embodiment of the present invention further provides an access gateway AG, including: a first receiving unit, configured to receive data channel establishment information from the terminal, and include a data channel establishment response of the address allocated by the core network for the terminal, and include Establishing a response for the data channel of the IP address assigned by the terminal; The query unit is configured to query the AP home server to query the AP to support the direct out of the Gi port service; the first sending unit is configured to forward the data channel establishment information to the core network, and is further configured to: when the query unit obtains the

When the AP supports the outgoing service of the Gi interface, the AP forwards the address data channel establishment information including the core network allocation to the AP, and is further configured to send a data channel establishment response including the IP address allocated to the terminal to the terminal.

The embodiment of the invention further provides a communication system, including:

The access point AP is configured to receive data sent by the terminal, and determine, according to the preset routing table and the destination address of the data, whether the next hop network element corresponding to the destination address of the data is the access gateway AG, When the next hop address corresponding to the destination address of the data is not the AG, the data is sent to the destination address by using the next hop network element, and the next hop address corresponding to the destination address of the data is the AG. The IP address of the data is converted into an address allocated by the GGSN to the terminal according to the mapping relationship between the IP address assigned to the terminal and the address allocated by the GGSN for the terminal, and the next hop corresponding to the destination address of the data. When the address is the AG, the data of the IP address is translated to the address allocated by the corresponding GGSN for the terminal, and is sent to the AG;

The access gateway AG is configured to receive data channel establishment information from the terminal, forward the data channel establishment information to the gateway general wireless packet service support node GGSN, and receive a data channel establishment response including the address allocated by the GGSN for the terminal, and query the AHR. The AP supports the direct-out of the Gi-port service. When the queried unit obtains the direct-out Gi-port service, the querier forwards the address data channel establishment information including the GGSN to the AP, and receives the IP address allocated for the terminal. Data channel establishment response, sending a data channel setup response containing the IP address assigned to the terminal to the terminal;

The gateway general wireless packet service support node GGSN is configured to receive information about an address allocated by the AG for the terminal, allocate an address for the terminal, and send the allocated address to the AG.

The access point AP is configured to receive, according to the preset data channel, the data sent by the terminal, and determine, according to the preset routing table in the AP, whether the next hop corresponding to the destination address in the data sent by the terminal is The AG, when the judgment result is that the next hop is the AG, according to the mapping relationship between the established IP address allocated to the terminal and the GGSN being the terminal, the data sent by the terminal is The IP address is translated to the address allocated by the GGSN to the terminal, and the converted data is sent to the AG. When the result of the determination is that the next hop is not the AG, the data sent by the terminal is sent to the network side. One-hop network element, the next hop network element is forwarded to the destination address;

The access gateway AG is configured to receive data sent by the AP according to a preset data channel, and send the data to the GGSN. a gateway general wireless packet service support node GGSN, configured to receive the data sent by the AG according to a preset data channel, and send the data to an application server;

An internet server, configured to receive data sent by the AP;

An application server, configured to provide a core network service for the terminal.

A method, a device, and a communication system for routing an AP out of a Gi interface are provided by the embodiment of the present invention. The AP and the network side establish two data channels, where the two data channels are data channels and slaves of the Gi port from the core network respectively. The AP directly out of the data channel of the Gi interface, and the network side AP selects one of the two data channels as the data transmission path according to the path corresponding to the destination address in the preset routing table. Therefore, the same APN that identifies different services in the prior art is solved, and only one data channel of the Gi port can be established, which may cause waste of the core network resources.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a flowchart of a method for routing a data out Gi port according to Embodiment 1 of the present invention;

2 is a flowchart of a method for routing data out of a Gi port according to Embodiment 2 of the present invention; FIG. 3 is a flow chart of a data flow when a terminal communicates with a network side according to Embodiment 2 of the present invention;

4 is a flowchart of a protocol stack conversion process performed by an AP on data according to Embodiment 2 of the present invention;

5 is a logical unit diagram of an access point AP according to Embodiment 4 of the present invention;

6 is a logic unit diagram of an access gateway AG according to Embodiment 6 of the present invention;

7 is a structural diagram of a communication system provided in Embodiment 7 of the present invention;

8 is a structural diagram of a communication system provided in Embodiment 8 of the present invention;

FIG. 9 is a structural diagram of a communication system provided in Embodiment 9 of the present invention.

In the embodiment of the present invention, the AP determines whether the terminal accesses the Internet service or the core network service according to the destination address in the preset routing table, and solves the same APN of different services identified in the prior art. The ability to establish a data channel out of the Gi port may cause a waste of core network resources. A method, a device, and a communication system for routing an AP out Gi service according to an embodiment of the present invention are described below with reference to a specific embodiment.

The first embodiment is a method for routing data out of a Gi interface. As shown in FIG. 1 , the method includes: Step 1: The access point establishes a data channel for the terminal to output a Gi port from the core network and a Gi port from the access point. Data channel

Step 2: Receive data sent by the terminal. Step 3: Send the data to a next hop network element in one of the two data channels corresponding to the destination address in the data according to the preset routing table and the destination address of the data. .

The data routing method of the Gi-port is provided by the first embodiment of the present invention. The AP and the network side establish two data channels, wherein the two data channels are respectively the data channel of the Gi port from the core network and the data channel directly from the AP. The data channel of the Gi n, the network side AP selects one of the two data channels as the path of data transmission according to the path corresponding to the destination address in the preset routing table. In the prior art, an APN can only establish one data channel. When there are multiple services identified by the APN, it may cause waste of core network resources.

A first embodiment of the present invention is a general description of a method for routing data out of a Gi port according to an embodiment of the present invention.

The second embodiment is a routing method for data out of the Gi port. The data channel of the Gi port from the core network can be specifically output from the GGSN in the core network. Referring to Figure 2, the method includes:

Step HI: The terminal sends a PDP context activation request to the network side, where the PDP context request includes an APN;

The sending PDP context activation request in the step HI carries the information and the APN of the data channel established by the terminal and the network side. It is understood that the format of the bearer information may be multiple, and the specific example is used in this embodiment. The format is a PDP context activation request, and the limitations of the embodiments of the present invention should not be understood.

Step H2: The network side AG forwards the AP through the AP, and receives the PDP context activation request. The PDP context request includes the APN, and the AG determines the service represented by the APN according to the preset information, and determines the service represented by the APN. It is possible to exit the Gi port;

The information preset on the AG in step H2 includes: a service represented by the APN, or a service associated with the APN. The preset information may further include: whether the APN represents or the associated service can output information of the Gi port. If the APN represents or associates the service with the information of the Gi port as the default, the AG can determine that all services can exit the Gi port. It should be understood that the information preset on the AG can be configured by the operator and stored on the AG. The AG here is an access gateway to which the AP to which the terminal belongs accesses the core network.

Step H3: The AG sends a PDP context request to the GGSN according to the judgment result in the step H2. The request for creating a PDP context sent in the step H3 carries a request for the GGSN to allocate an IP address for the terminal. The specific format carrying the request for the GGSN to allocate an IP address to the terminal may have other formats besides creating a PDP context request. The following text for an understanding of creating PDP context requests can be found here.

Step H4: After receiving the request for creating a PDP context, the GGSN allocates an address to the terminal. Step H5: The GGSN sends a Create PDP Context Response to the AG, where the Create PDP Context Response includes an address allocated by the GGSN for the terminal.

Step H6: The AG sends an inquiry to the AHR (AP home server) for querying whether the AP communicating with the terminal supports the service directly outgoing from the Gi port;

Step H7: The AHR determines, according to the received query information, whether the AP supports the direct out of the Gi interface, and sends the information including the query result to the AG. If the query result is yes, the process proceeds to step H8. If the query result is no, the process proceeds to step H12. The time for performing the step H6 and the step H7 may be the same as the step H3 to the step H5, that is, after the step H2 determines that the service represented by the APN is available for the Gi port, the GGSN may be allocated for the terminal. Address and query whether the AP communicating with the terminal can support the direct outgoing port.

Step H8: After the AG receives the information of the PDP context response and/or the query result sent by the AHR, the AG establishes an RAB with the terminal;

The method for establishing an RAB between the AG and the UE in the step H8 is prior art.

Step H9: If the result of the determination in step H7 is that the AP supports the direct out of the Gi interface, the AG sends a PDP context request to the AP, where the request to create the PDP context includes the address allocated by the GGSN for the terminal; Step H10: The AP receives After the PDP context request is created, the terminal is allocated an address, and a mapping relationship between the address allocated by the AP for the terminal and the address allocated by the GGSN to the terminal is established;

The mapping relationship between the address allocated by the AP for the terminal and the address allocated by the GGSN to the terminal in the step H10 specifically includes: according to the identifier of the terminal in the AP, the address allocated by the GGSN to the terminal And the address assigned by the AP to the terminal is associated with the unique identifier of the terminal in the AP, and the mapping between the address allocated by the GGSN for the terminal and the address allocated by the AP for the terminal is implemented.

Step H11: The AP sends a PDP context response to the AG, where the PDP context response includes the address allocated by the AP for the terminal.

It should be noted that, in step H8, after the step H11, that is, the AP assigns an address to the terminal successfully, the RAB is established.

Step H12: The AG sends a PDP context activation response to the terminal, where the PDP context activation response includes an address allocated by the AP for the terminal.

It should be understood that the PDP context activation response sent in step H12 may also be the address allocated by the GGSN for the terminal. If so, when the data sent by the terminal directly exits the Gi port through the AP, the data packet includes the data packet. The NAT (network address translators) conversion is performed, and the address assigned by the GGSN to the terminal in the terminal is translated into an address assigned by the AP to the terminal, and the AP sends the data out of the Gi port. Step H13: The terminal receives a PDP context activation response sent by the UE, where the PDP context activation response includes an address allocated by the AP for the terminal or an address allocated by the GGSN for the terminal.

Step HI to step H13 implements a process of establishing two data channels between the terminal and the network side, where the two data channels include: a data channel for accessing the core network service and a data channel for accessing the Internet service.

Step H14: According to the established data channel and the preset routing table in the AP, the terminal performs data communication with the network side.

The method for performing data communication between the terminal and the network side in step H14 is as shown in FIG. 3, which specifically includes: the data sent by the terminal is determined according to the data channel that has been established, and the routing table in the AP, If the hop is an AG, the AP sends the data to the AG, and the AG sends the data to the GGSN. The data is accessed by the GGSN to access the application server on the core network. When it is determined that the destination address of the sent data is the address on the Internet, the AP will The network element directly sent to the next hop indication, for example, the network element indicated by the next hop may be a host, a gateway, or a router. And the network element forwards it to the destination address in the Internet. The data that the terminal sends data to the destination address through the device on the network side is called uplink data. Similarly, the data sent by the network side to the terminal is called downlink data.

It should be noted that, in the data communication between the terminal and the network side in the step H14, after the AP on the network side receives the data sent by the terminal, the method for processing the data, as shown in FIG. 4, specifically includes: The table determines whether the destination address in the data sent by the receiving terminal is an address in the core network or an address on the Internet, that is, whether the next hop corresponding to the destination address in the routing table is an AG or another device; if it is determined to be the data The destination address in the Internet is an address on the Internet, and the AP sequentially performs processing on the L1 layer, processing on the L2 layer, and processing on the underlying bearer. If the address assigned by the AP to the terminal is the subnet address of the AP in step H10, the AP performs the L2 upper layer processing on the data, and before the processing of the underlying bearer, the method further includes: performing network address translation on the address of the terminal included in the data. (NAT: network address translators), referred to as NAT translation. The function of the NAT translation is to convert the address of the terminal in the AP subnet to the external network address. The NAT is converted to processing on the IP layer.

If it is determined that the destination address in the data sent by the terminal is an address in the core network, that is, the next hop corresponding to the destination address in the routing table is an AG, the AP sequentially performs processing on the L1 layer, and on the L2 layer. Processing, user plane GPRS tunneling protocol (GTP-U: GPRS Tunneling Protocol for the user plane) layer processing, IP layer processing and underlying bearer processing. The AP performs the processing on the L1 layer, the processing on the L2 layer, and performs NAT conversion on the IP packet sent by the UE. The GTP-U processing, the IP layer processing, and the processing of the underlying bearer are prior art.

The L1 layer is the first layer in the wireless network, that is, the physical layer; the L2 layer is the wireless network. The second layer includes a medium access control layer (MAC: Media Access Control) RLC and a packet data convergence protocol (PDCP) layer. The processing of the underlying bearer is directed to processing on the link layer and the physical layer in the transport network. The GTP-U process is for data processing on the tunnel between the AP and the AG. The NAT translation of the IP packet sent by the terminal may be to convert the private network address of the terminal into a unique IP address on the IP network. The data processing described above is prior art.

When the AP processes the data sent by the Internet or the AG, the data sent by the terminal is sent to the network element indicated by the next hop, and is forwarded by the network element to the destination address in the Internet or sent to the AG. Previously, the method of processing data was reversed. The processing of the data sent by the AP to the terminal can be referred to, and the method for processing the data sent by the AP to the Internet or by the AG can be easily obtained.

It should be noted that the routing table preset in the AP in step H14 is configured to: when the AP receives the data sent by the terminal, determine whether to forward the data to the AG according to the information in the routing table, or The data is forwarded to the network element indicated to the next hop, and forwarded by the network element to the destination address in the Internet. The preset routing table may be sent to the AP by the remote management of the operator, or may be generated by the user at the near end of the AP. Therefore, the routing method of the AP out Gi service is provided in the second embodiment of the present invention. Before the step HI, the method further includes: presetting a routing table in the AP.

The method of the preset routing table may be: the remote management of the operator is sent to the AP, or may be generated by the user at the near end of the AP. The routing table may be specifically as shown in the following Table 1, wherein the address assigned by the AP to the terminal is 192.168.0.1; the address of the application server in the core network service is 10.0.0.1; and the destination address of the Internet service that the UE expects to access is 210.45. .0.1. If the destination address is the default in the following table 1, the AP determines that the data with the destination address of 10.0.0.1 is sent by the AP to the AG, and the rest of the destination addresses. The AP sends the data to the next hop. The network element is then forwarded by the network element to the server on the Internet. The routing table includes the correspondence between the destination address and the next network element in at least one data channel.

Table 1: Routing Table

A method for routing an IP outbound service of an AP provided by the second embodiment of the present invention, the beneficial effect of the method is: setting the APN and the network layer to establish two data channels, without modifying the existing network side device, The two data channels are respectively a data channel for accessing the core network service and a data channel for accessing the Internet service, and the network side AP selects one of the two data channels according to the path corresponding to the destination address in the preset routing table. The strip acts as a path for data transfer. The data of the same APN identity is solved in the prior art. Only one data channel of the outbound interface can be established. The preset routing table is used to avoid wasting the core network resources.

The foregoing is a description of the method provided by the embodiment of the present invention. The device provided by the embodiment of the present invention is described below.

The third embodiment of the present invention provides a method for routing data out of the Gi interface. The method is similar to the method provided in the second embodiment. The difference is that the AG and GGSN on the network side in the second embodiment are two. An independent entity, in fact, the GGSN can be integrated in the AG. In the third embodiment of the present invention, the GGSN is integrated in the AG, and the AG performs the task originally performed in the GGSN, that is, the AG not only performs the determination. The service represented by the APN determines that the service represented by the APN can be out of the Gi port; the terminal is also assigned an address to establish a channel for the terminal to exit the Gi port from the GGSN. Therefore, the method provided by the embodiment of the present invention includes:

The steps F1 and F2 are similar to the steps H1 and H2 in the second embodiment, and the description in the second embodiment can be referred to.

Step F3: The AG allocates an address to the terminal; that is, the operation performed by the GGSN in the second embodiment is implemented in the AG.

The steps F4 to F13 are similar to the steps H6 to H15 in the second embodiment, and the description in the second embodiment can be referred to.

A method for routing an IP outbound service of an AP is provided in Embodiment 3 of the present invention. The beneficial effect of the method is: After the GGSN is integrated in the AG in the network side device, the terminal sets an APN to establish two data channels with the network layer. The two data channels are respectively a data channel for accessing the core network service and a data channel for accessing the Internet service, and the network side AP selects the two data channels according to the path corresponding to the destination address in the preset routing table. A path as a data transfer. It solves the different services of the same APN identifier in the prior art, and can only establish a data channel out of the Gi port, and adopts a preset routing table to avoid waste of core network resources.

Embodiment 4 An access point AP, as shown in FIG. 5, includes: a receiving unit 101, an allocation address unit 102, a transmitting unit 103, a data processing unit 105, an address mapping unit 106, and a determining unit 107.

The receiving unit 101 is configured to receive information about establishing a data channel sent by the terminal, and receive information about an address allocated by the terminal that is sent by the AG, and an address that the gateway general-purpose wireless packet service support node GGSN that is forwarded by the AG allocates the terminal. Receiving data sent by the terminal, and receiving information about establishing a radio access bearer RAB between the terminal and the AG;

The address unit 102 is configured to allocate an internet protocol IP address to the terminal; wherein the unit may also include a dynamic host allocation protocol (DHCP: Dynamic Host Configuration Protocol) connected to the AP. On the server, the AP can acquire and use the assigned address unit 102.

The address mapping unit 106 is configured to establish a mapping relationship between the address allocated by the AP for the terminal and the address allocated by the GGSN to the terminal. The determining unit 107 is configured to determine, according to the routing table preset in the AP, the destination address in the data sent by the terminal. Whether the corresponding next hop is the AG;

The data processing unit 105 is configured to process the data according to the determination result in the determining unit 107. When the determining unit 107 determines that the next hop corresponding to the destination address in the data sent by the terminal is not an AG, performing processing on the L1 layer, the L2 layer, and the underlying bearer on the received data; or determining the terminal in the determining unit 107 When the next hop corresponding to the destination address in the transmitted data is the AG, the data is processed by the L1 layer, the L2 layer, the NAT packet sent by the terminal, the GTP-U layer, the IP layer, and the underlying bearer. If the AP determines that the data sent by the terminal is to be sent to the destination address on the core network according to the preset routing table in the AP, and the AP and the GGSN respectively assign addresses to the terminal, the data processing unit 105 in the AP may also be used. The data sent by the terminal is NAT-transformed according to the mapping relationship between the address allocated by the AP and the address allocated by the GGSN for the terminal, and the device in the core network can identify the address of the terminal.

If the address assigned by the terminal is a subnet address subordinate to the AP, and the determining unit 107 is configured to determine, according to the routing table preset in the AP, the data sent by the terminal is the network element to be sent to the next hop indication, and The data processing unit 105 is further configured to perform NAT translation on the address in the data sent by the terminal, and convert the address in the data sent by the terminal into an address recognizable in the IP network. . The logical unit that implements the function of data NAT conversion in the data processing unit 105 may be a device with an NAT conversion function acquired by the AP;

The sending unit 103 is configured to send information about establishing a radio access bearer RAB between the terminal and the AG, and send the IP address allocated to the terminal to the AG, and process the data processed by the data processing unit 105. The data is sent to the AG, or the data of the next hop corresponding to the destination address in the data sent by the determining unit 107 is not directly transmitted to the next hop network element on the network side.

An AP provided in Embodiment 4 of the present invention may further include a configuration routing table unit 104, configured to configure a routing table, where the configuration routing table may be a routing table generated by the AP receiving information generated by the operator remotely. It may be a routing table generated by the user in the near end configuration of the AP. It will be understood that the figures or embodiments are merely illustrative and represent logical structures in which the modules displayed as separate components may or may not be physically separate, and the components displayed as modules may be Or it may not be a physical unit, that is, it can be located in one place or distributed to several network entities.

An AP provided in Embodiment 4 of the present invention, where the AP allocates an address unit 102 to allocate an address for the terminal, The data channel of the Gi port is set up between the APs. The AP determines whether the data sent by the received terminal is the Gi port from the AP or the AP sends the data to the AG according to the preset routing table. With the AP, the network can use the AP to establish two data channels. According to the preset routing table in the AP, the AP sends the data to the next-side device on the network side to avoid wasting the core network resources.

The fifth embodiment is an access point AP, and the access point AP is similar to the AP provided in the fourth embodiment. The AP can be specifically configured with reference to the following description. The AP provided in this embodiment includes: a receiving unit, a determining unit, and a sending unit. 1. Processing unit and transmitting unit 2.

The receiving unit is configured to receive data sent by the terminal.

a determining unit, configured to determine, according to the preset routing table and the destination address of the data, whether the next hop network element corresponding to the destination address of the data is an access gateway AG;

The sending unit 1 is configured to: when the next hop address corresponding to the destination address of the data is not an AG, send the data to the destination address by using the next hop network element;

a processing unit, configured to: when the next hop address corresponding to the destination address of the data is an AG, convert the IP address of the data into a mapping relationship between an IP address allocated by the AP for the terminal and an address allocated by the GGSN to the terminal The corresponding GGSN is an address allocated by the terminal;

The sending unit 2 is configured to: when the next hop address corresponding to the destination address of the data is an AG, convert the IP address into data corresponding to the address allocated by the GGSN for the terminal, to the AG.

It should be noted that the AP may further include: a storage unit, configured to store a routing table.

It will be understood that the figures or embodiments are merely illustrative and represent logical structures in which the modules displayed as separate components may or may not be physically separate, and the components displayed as modules may be Or it may not be a physical unit, that is, it can be located in one place or distributed to several network entities.

Through the foregoing description of the AP provided in this embodiment, the AP may determine the address of the next hop of the data according to the address in the data sent by the terminal, and send the data according to the judgment result, and send the data directly to the Destination address, thus avoiding the waste of core network resources. An embodiment of the present invention further provides an AP, including:

a second receiving unit, configured to receive data sent by the terminal;

An obtaining unit, configured to acquire a mapping relationship between an IP address allocated to the terminal and an address allocated by the GGSN to the terminal, where the determining unit is configured to determine, by the determining unit, a destination address pair of the data received by the first receiving unit When the next hop address is the AG, the IP address of the data is converted to the address allocated by the GGSN to the terminal according to the mapping relationship between the IP address allocated by the acquiring unit and the address allocated by the GGSN for the terminal; a second sending unit, configured to: when the determining unit determines that the next hop network element corresponding to the destination address of the data received by the first receiving unit is not an AG, send the data to the next hop network element to Or the destination address; or, when the next hop network element corresponding to the destination address of the data is an AG, the data that is converted into the address allocated by the GGSN to the terminal is sent to the AG. The second receiving unit in this embodiment is further configured to receive information for establishing a data channel that is sent by the terminal, and receive information that is generated by the AG after receiving the information about establishing the data channel, and that is sent by the terminal to allocate an address and And the information that the gateway general-purpose wireless packet service support node GGSN allocates for the terminal, and receives information about the radio access bearer RAB between the establishing terminal and the AG; the acquiring unit is further configured to acquire the terminal for the terminal. The sending unit is further configured to send the IP address allocated to the terminal to the AG. The AP in the embodiment of the present invention further includes: an address mapping unit, configured to establish an IP address and a GGSN allocated for the terminal. The mapping relationship of the addresses assigned to the terminal.

The sixth embodiment, an access gateway AG, as shown in FIG. 6, includes: a first receiving unit 201, a determining service unit 202, a first sending unit 203, and a query unit 207. The AG may also include an RAB setup unit 204. among them,

The first receiving unit 201 is configured to receive a PDP context activation request sent by the terminal, receive a query response that includes the query result sent by the AHR, and receive a create PDP context response sent by the AP and the GGSN, where the PDP context response includes The address assigned by the AP to the terminal and the address allocated by the GGSN to the terminal, and the data sent by the receiving terminal or the network side;

The first receiving unit may specifically include: a receiving module 1 configured to receive data channel establishment information from the terminal, in order to facilitate understanding of the first receiving unit 201;

a receiving module 2, configured to receive a data channel establishment response including an address allocated by the core network for the terminal; and a receiving module 3, configured to receive a data channel establishment response that includes an IP address allocated by the AP for the terminal; 203. The method is configured to send the query information to the AHR, where the query information is used to query whether the subscription information of the AP that communicates with the terminal supports the outbound communication service, and sends a PDP context request to the AP.

The GGSN sends a PDP context activation response to the terminal, where the PDP context activation response includes an address allocated by the AP for the terminal, and sends data to the terminal or the network side;

The first sending unit 203 may specifically include a sending module 1 for forwarding data channel establishment information to the core network, in order to facilitate understanding of the first sending unit 203.

The sending module 2 is configured to: when the query unit acquires the direct support of the Gi port service, the query unit rotates to the AP Sending address data channel establishment information including the core network allocation;

The sending module 3 is configured to send a response to the data channel that includes the IP address allocated by the AP for the terminal to the terminal.

The query unit 207 is configured to query the AHR for the AP to directly output the Gi port service;

The RAB establishing unit 204 is configured to establish an RAB connection with the terminal by using the AP;

The determining service unit 203 is configured to determine, according to the APN in the received PDP context activation request, the service represented by the APN.

The AG has the above logic function module to establish a data channel between the terminal and the network side, and performs data communication between the terminal and the network side. The AG may further include a determining egress unit 205, configured to determine whether the service represented by the APN in the received PDP context activation request can be out of the Gi port; wherein, the basis of the service represented by the APN determined by the AG can be out of the Gi port. It is configured by the operator. If the AG does not include the judgment egress unit 205, the AG can default to the Gi port for all services.

The AG may also include a GGSN functional unit 206 for implementing the GGSN function. The GGSN functional unit 206 is modified on the AG, and the GGSN is modified so that the GGSN can identify the address assigned by the AP to the terminal, and the GGSN function unit 206 can not allocate the address to the terminal.

The foregoing description of an AG provided in Embodiment 6 of the present invention, the AG can respectively establish a PDP context by communicating with the GGSN and the AP, and establish a data channel for the terminal to access the core network service and a data channel for accessing the Internet service, and implement the terminal and the network side. The two data channels communicate.

The embodiment of the present invention further provides a communication system, which will be described below in conjunction with a specific embodiment.

Embodiment 7 is a communication system, where the communication system can establish two data out channels of the Gi port after receiving the information of the data channel sent by the terminal, which are respectively the data channel and the slave AP of the Gi port from the GGSN. The data channel of the Gi port. Referring to FIG. 7, the method includes: an access point AP501, an access gateway 502, and a gateway universal wireless packet service support node GGSN503.

The access point AP 501 receives the information of the established data channel sent by the terminal, and sends the received information of the established data channel to the access gateway AG, establishes a radio access bearer RAB between the terminal and the AG, and receives the AG sending. Information for assigning addresses to terminals and gateway general-purpose wireless packet service support node GGSN forwarded by said AG Assigning an IP address to the terminal, assigning an IP address to the terminal, establishing a mapping relationship between the IP address assigned by the AP and the GGSN for the terminal, and passing the IP address assigned to the terminal through the AG Forwarded to the terminal;

The access gateway AG502 is configured to receive the information about the data channel, send the information of the address assigned to the terminal to the GGSN, and receive the address allocated by the GGSN for the terminal, and obtain whether the AP to which the terminal belongs supports the direct out of the Gi port service, and if yes, send And the information about the address assigned to the terminal is sent to the AP, where the information that is sent to the AP for the terminal includes the address that the GGSN allocates for the terminal, and the AP that is sent by the AP is the address allocated by the terminal, and the sending is successfully established. Information of the data channel to the terminal;

The gateway general wireless packet service support node GGSN 503 is configured to receive information about an address allocated by the AG for the terminal, allocate an address for the terminal, and send the allocated address to the AG.

A communication system provided in Embodiment 7 of the present invention may further include: an AP Home Server AHR 504, a Dynamic Host Assignment Protocol DHCP Server 505, and an Address Assignment Server 506.

The AP home server AHR 504 is configured to provide the AG with information about whether the AP to which the terminal belongs supports the direct outgoing port service.

The dynamic host allocation protocol DHCP server 505 is configured to provide the AP with an address assigned to the terminal. An address assignment server 506 is configured to provide an address assigned to the terminal for the GGSN.

Through the above description of Embodiment 5 of the present invention, the communication system can establish two data outgoing data channels of the Gi port after receiving the information of establishing the data channel sent by the terminal, respectively, the data channel and the slave port of the Gi port from the GGSN. The data channel of the AP out of the Gi port.

Embodiment 8 is a communication system, which can send data out of a Gi port with as few routing times as possible according to a preset data channel and a preset routing table in the AP. Referring to FIG. 8, including: an access point AP 701, an access gateway AG 702, a gateway general wireless packet service support node GGSN 703, an internet server 704, and an application server 705.

The access point AP701 is configured to receive data sent by the terminal according to the preset data channel, and determine, according to the preset routing table in the AP, whether the next hop corresponding to the destination address in the data sent by the terminal is And the AG, if yes, converting the IP address in the data sent by the terminal to the GGSN as a terminal according to the mapping relationship between the IP address allocated to the terminal and the GGSN being the terminal. The allocated address, the converted data is sent to the AG, if not, the data sent by the terminal is sent to the network side next hop; the access gateway AG702 is configured to receive the data according to the preset data channel. Data sent by the AP, and the data is sent to the GGSN; The gateway general wireless packet service supporting node GGSN703 is configured to receive the data sent by the AG according to a preset data channel, and send the data to an application server;

An internet server 704, configured to provide an internet service for the terminal;

The application server 705 is configured to provide core network services for the terminal.

A communication system according to Embodiment 8 of the present invention may further include: a network address translation NAT device 706, configured to determine, in the AP 701, that the next hop corresponding to the destination address in the data sent by the terminal is AG702, according to the The mapping between the IP address assigned to the terminal and the GGSN 704 is the terminal allocation address, and the IP address in the data sent by the terminal is converted into an address allocated by the GGSN 704 for the terminal, and the converted data is sent to the AP 701;

It can be understood that, when the AP 701 determines that the data sent by the terminal needs to be sent out of the Gi port by the GGSN, the AP 701 can transfer the processing of the data to the network address translation NAT device 706 for execution.

By the above description of the seventh embodiment of the present invention, the communication system can send the data route of the Gi port to the destination address according to the preset two data out of the data channel of the Gi port, thereby saving resources of the network.

The above is a general description of the communication system provided by the embodiment of the present invention. The following embodiment 9 is an embodiment of a preferred communication system provided by the embodiment of the present invention.

Embodiment 9 is a communication system. Referring to FIG. 9, the method includes: an access point 10, an access gateway 20, an AP home server 30, a gateway GPRS support node 40, an internet server 60, and an application server 70.

The access point 10 is configured to receive a PDP context request sent by the AG, allocate an address to the terminal, and send a PDP context response to the AG, where the PDP context response includes an address that the AP allocates for the terminal, and the data sent by the terminal according to the routing table. Sending to the AG or the Internet server; wherein, if the GGSN 40 also assigns an address to the terminal, the AP is also used to establish a mapping relationship between the address allocated by the AP for the terminal and the address allocated by the GGSN to the same terminal, according to the routing table, the forwarding terminal and the The data between the Internet servers is sent to the AG according to the routing table.

The access gateway 20 is configured to receive a PDP context request, determine a service represented by the APN included in the PDP context request, send a PDP context request to the GGSN, and receive a PDP context response sent by the GGSN, where the PDP context response includes the GGSN The address assigned by the terminal, sends a query to the AP to support the information of the direct outbound interface to the AHR 30, receives the query result information sent by the AHR, establishes the RAB with the terminal, and sends a PDP context request to the AP, where the PDP context request includes the GGSN as the terminal. The assigned address, the receiving PDP context response sent by the AP, where the PDP context response includes an address allocated by the AP for the terminal, Sending a PDP context activation response to the terminal, where the PDP context activation response includes an address allocated by the AP for the terminal, and forwarding data between the terminal and the network side;

The AP home server 30 is configured to receive the query sent by the AG, whether the AP supports the direct outgoing information of the Gi port, and sends the query result information to the AG;

The gateway GPRS support node 40 is configured to receive a PDP context request sent by the AG, allocate an address for the terminal, and send a PDP context response to the AG, where the PDP context response includes an address allocated by the GGSN for the terminal, and the forwarding AG30 and the application service 70 Data between

The Internet server 60 is configured to receive data sent by the AP10, and send data to the AP10.

The application server 70 is configured to receive data sent by the GGSN 40 and send data to the GGSN 40.

It is also considered that the Internet server 60 provides an Internet service for the terminal, and the application server 70 provides the core network service for the terminal. It should be noted that the most important function of the network side device including the AP, the AG, the GGSN, and the like is to forward data between the terminal and the server providing the service. Therefore, the above two statements about the Internet server 60 and the application server 70 are substantially the same.

The communication system can also include a NAT translation device 80, a DHCP server 90, and an address assignment server 100. The NAT conversion device 80 is configured to convert an address in the data sent by the received terminal into an address recognizable on the Internet, and perform reverse conversion on the received data on the Internet, respectively, according to the AP and the GGSN. Mapping management of the address allocated by the same terminal, converting the address of the data sent by the terminal into an address allocated by the GGSN for the terminal, and performing opposite conversion on the data sent by the received GGSN;

a DHCP server 90, configured to provide an address assigned to the terminal for the access point 10;

The address allocation server 100 is configured to provide the GGSN 40 with an address assigned to the terminal.

When a terminal needs to access services on the network, it first needs to establish a data channel with the network side. The terminal sends a PDP context activation request to the network side, and the PDP context request includes an APN. After receiving the PDP context activation request, the network side AG20 obtains the APN in the PDP context activation request, and determines the service represented by the APN, according to the carrier pair. The configuration of the AG20, the AG20 supports all the services out of the Gi interface. Therefore, the AG20 sends a request to create a PDP context to the GGSN 40. After receiving the request, the GGSN configures an address for the terminal, and the address is included in the Create PDP Context Response and sent to the AG20. The AG 20 establishes an RAB connection with the terminal. The AG 20 sends a message to the AHR 30 to query whether the AP supports the direct outgoing IP address. The AG 20 sends the information about whether the AP supports the direct outgoing IP port. The PDP context request is created to the GGSN 40 for simultaneous execution, that is, the AG establishes a data channel for the two terminals to communicate with the network side. After receiving the information about whether the AP supports the direct out of the Gi interface, the AHR 30 receives the information saved when the AP opens the account, and queries and The Whether the AP 10 connected to the terminal is enabled to directly send out the service of the Gi interface, and the AHR 30 sends the query result to the AG 20; if the query result is that the AP 10 supports the direct out of the Gi interface service, the AG 20 sends a PDP context request to the AP 10; the AP 10 receives the created PDP context. After the request is made to the AP10, the terminal is assigned an address, and the mapping relationship between the address assigned by the AP10 and the GGSN 40 for the terminal is established, and the address allocated by the AP10 is included in the Create PDP Context Response and sent to the AG20; the AG20 receives the creation context sent by the A10. After the request, the AP10 obtains the address assigned to the terminal, and the address is included in the PDP context activation response and is sent to the terminal. If the query result in the AHR30 is that the AP10 does not support the direct outgoing Gi service, the AG20 directly sends the PDP context activation response to the terminal. The terminal, the PDP context activation response includes an address allocated by the GGSN 40 for the terminal.

Through the above description, in the communication system provided by the ninth embodiment of the present invention, the data channel of the terminal accessing the core network service and accessing the Internet service is established. When the terminal wants to access the core network service, the terminal sends data to the AP20, and the AP20 receives the data. The data is converted into a NAT according to the routing table saved in the AP20, and the address allocated by the AP included in the data is converted into an address allocated by the GGSN, and the converted data is sent to the AG20, and the data is sent by the AG20. The GGSN 40 reaches the destination address of the core network, such as the application server 70; the core network side application server 70 needs to send the service data to the terminal through the opposite path; if the terminal wants to access the Internet service, the terminal sends data to the AP 20, and the AP 20 receives the The data is sent to the server 60 on the Internet according to the routing table saved in the AP 20. The server 60 on the Internet needs to send the service data to the terminal through the opposite path.

If the terminal belongs to the subnet where the AP 20 is located, the data sent by the terminal to the AP needs to be translated by NAT, and the subnet address of the terminal is translated into an IP address. The device that performs the NAT translation may be a NAT translation device connected to the AP 20. 80. The device that implements the AP10 to allocate an address to the address allocated by the GGSN 40 to the terminal may also be implemented by the NAT conversion device 80.

The device for realizing the AP20 to allocate an address to the terminal may be implemented by the AP 20, or the AP 20 may be implemented by the DHCP server 90 connected to the AP, that is, the terminal allocates an address to the terminal in the DHCP server, and sends the allocated address. Give AP20. Similarly, the GGSN 40 can also obtain the address assigned to the terminal from the address distribution server 100.

By the above description of a communication system provided by Embodiment 9 of the present invention, after receiving the information of establishing a data channel sent by the terminal, the communication system establishes two data out channels of the Gi port, and the communication system can implement The data sent by the terminal is sent to the destination address by a small number of routes, which saves resources of the network.

A person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be performed by a program to instruct related hardware, and the program may be stored in a computer readable storage medium. When the program is executed, it includes the following steps:

Receiving data sent by the terminal;

And sending the data to a next hop network element in one of the two data channels corresponding to the destination address of the data according to the preset routing table and the destination address of the data.

The above-mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

The foregoing describes a routing method, a corresponding device, and a communication system for a data out interface provided by an embodiment of the present invention. The principles and implementation manners of the present invention are described in the following. The description is only for helping to understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in specific embodiments and application scopes. The contents of this specification are not to be construed as limiting the invention.

Claims

Rights request

A method for routing data out of a Gi port, which is characterized by comprising:

Receiving data sent by the terminal;

And sending, according to the preset routing table and the destination address of the data, the next hop network element in one of the two data channels corresponding to the destination address of the data, where the The routing table includes a correspondence between the destination address and the next hop network element in the at least one data channel.

The method according to claim 1, wherein the establishing a data channel from the core network to the Gi port and the data channel from the access point to the Gi port comprises:

Receiving information sent by the terminal for establishing a data channel;

Transmitting the information about establishing the data channel to the access gateway AG;

Establish a radio access bearer RAB between the terminal and the AG;

Receiving, by the AG, information for assigning an address to the terminal after receiving the information about establishing the data channel, and an address that is forwarded by the AG, and the gateway general wireless packet service support node GGSN is allocated to the terminal;

Assigning an Internet Protocol IP address to the terminal according to the information for assigning an address to the terminal;

The method further includes: establishing a mapping relationship between the IP address and an address allocated by the GGSN to the terminal; and forwarding the IP address and/or the address allocated by the GGSN to the terminal to the terminal by using the AG.

The method according to claim 1, wherein the data is sent to the two corresponding to the destination address of the data according to a preset routing table and a destination address of the data. The next hop NE in one of the data channels, including:

Determining, according to the preset routing table and the destination address of the data, whether the next hop network element corresponding to the destination address in the data is the AG in the data channel of the Gi port from the core network,

If the next hop network element in the data channel corresponding to the destination address in the data sent by the terminal is the AG, converting the IP address in the data sent by the terminal to the foregoing according to the established mapping relationship GGSN is an address assigned to the terminal; the converted data is sent to the AG;

If the next hop corresponding to the destination address in the data sent by the terminal is not the AG, the data sent by the terminal is sent to the next hop network element in the data channel of the Gi-port of the access point. .

The method according to any one of claims 1 to 3, wherein the next hop network element in the data channel of the access point out of the Gi interface is a host, a gateway or a router.

5. An access point AP, which is characterized by:

a second receiving unit, configured to receive data sent by the terminal;

An obtaining unit, configured to acquire a mapping relationship between an IP address allocated to the terminal and an address allocated by the GGSN to the terminal; and a processing unit, configured to: when the determining unit determines, corresponding to the destination address of the data received by the first receiving unit When the hop address is the AG, the IP address of the data is converted to the address allocated by the GGSN to the terminal according to the mapping relationship between the IP address allocated by the acquiring unit and the address allocated by the GGSN to the terminal; the second sending unit And when the determining unit determines that the next hop network element corresponding to the destination address of the data received by the first receiving unit is not an AG, sending the data to the Or the destination address; or, when the next hop network element corresponding to the destination address of the data is an AG, the data that is converted into the address allocated by the corresponding 0GSN for the terminal is sent to the AG.

6. The AP according to claim 5, characterized in that

The second receiving unit is further configured to receive information for establishing a data channel that is sent by the terminal, and receive information that is generated by the AG after receiving the information about establishing the data channel, and that is sent by the terminal to allocate an address and the AG. Forwarding, the gateway general wireless packet service support node GGSN is an address allocated by the terminal, and receives information about establishing a radio access bearer RAB between the terminal and the AG;

The obtaining unit is further configured to acquire an IP address allocated for the terminal;

The sending unit is further configured to send the IP address allocated to the terminal to the AG;

The method further includes: an address mapping unit, configured to establish a mapping relationship between an IP address allocated to the terminal and an address allocated by the GGSN to the terminal.

7. An access gateway AG, which is characterized by comprising:

a first receiving unit, configured to receive data channel establishment information from the terminal, include a data channel establishment response of the address allocated by the core network for the terminal, and establish a response by using a data channel that includes an IP address allocated to the terminal; The unit is configured to query the AP home server to query the AP to directly output the Gi port service;

The first sending unit is configured to forward the data channel establishment information to the core network, and is further configured to: when the query unit obtains the direct support for the outbound Gi port service, forward the address data channel that is included in the core network to the AP The establishment information is further used to send a response to the data channel including the IP address assigned to the terminal to the terminal.

The AG according to claim 7, wherein the AG further comprises: a radio access bearer RAB establishing unit, configured to establish a radio access bearer RAB by using the AP and the terminal.

9. A communication system, comprising:

20

Replacement page (Article 26) The access point AP is configured to receive data sent by the terminal, and determine, according to the preset routing table and the destination address of the data, whether the next hop network element corresponding to the destination address of the data is the access gateway AG, When the next hop address corresponding to the destination address of the data is not the AG, the data is sent to the destination address by using the next hop network element, and the next hop address corresponding to the destination address of the data is AG. The IP address of the data is converted into an address allocated by the GGSN to the terminal according to the mapping relationship between the IP address assigned to the terminal and the address allocated by the GGSN for the terminal, and the next hop corresponding to the destination address of the data. When the address is the AG, the data of the IP address is translated to the address allocated by the corresponding GGSN for the terminal, and is sent to the AG;

The access gateway AG is configured to receive data channel setup information from the terminal, forward the data channel setup information to the gateway general wireless packet service support node GGSN, and receive a data channel setup response including the address allocated by the GGSN for the terminal, to the AP. The server queries the AP to support the direct out of the Gi-port service. When the query unit obtains the direct-out of the Gi-port service, the query unit forwards the address data channel establishment information including the GGSN to the AP, and the receiving includes allocating the terminal for the terminal. Data channel establishment response of the IP address, sending a data channel setup response containing the IP address assigned to the terminal to the terminal;

10. The system according to claim 9, wherein the system further comprises:

The AP home server is configured to provide the AG with information about whether the AP to which the terminal belongs supports the direct outgoing port service.

The system according to claim 9, wherein the system further comprises:

A dynamic host allocation protocol DHCP server is configured to provide the AP with an IP address assigned to the terminal.

12. The system of claim 9, wherein the system further comprises:

An address allocation server, configured to provide an address assigned to the terminal for the GGSN.

13. A communication system, comprising:

The access point AP is configured to receive data sent by the terminal according to the preset data channel, and determine, according to the preset routing table in the AP, whether the next hop corresponding to the destination address in the data sent by the terminal is The AG, when the judgment result is that the next hop is the AG, according to the mapping relationship between the IP address allocated for the terminal and the gateway general wireless packet service support node GGSN for the terminal, the data sent by the terminal The IP address is translated to the address allocated by the GGSN to the terminal, and the converted data is sent to the AG. When the result of the determination is that the next hop is not the AG, the data sent by the terminal is sent to the network side. The network element of the next hop is forwarded to the destination address;

The access gateway AG is configured to receive data sent by the AP according to a preset data channel, and replace the data with the page (Article 26) Sent to the GGSN;

a gateway general wireless packet service support node GGSN, configured to receive the data sent by the AG according to a preset data channel, and send the data to an application server;

An internet server, configured to receive data sent by the AP;

14. The system according to claim 13, wherein the system further comprises:

a network address translation NAT device, configured to determine, in the AP, that a next hop corresponding to a destination address in the data sent by the terminal is an AG, and the IP address allocated to the terminal according to the established IP address and the GGSN Assigning a mapping relationship of the address to the terminal, converting the IP address in the data sent by the terminal to the address allocated by the GGSN to the terminal, and transmitting the converted data to the AP;

The AP is configured to send the converted data to the AG.