WO2010000180A1

WO2010000180A1 - A message transfer method, interworking proxy node, data gateway and network system

Info

Publication number: WO2010000180A1
Application number: PCT/CN2009/072379
Authority: WO
Inventors: 周青; 银宇; 胡颖
Original assignee: 华为技术有限公司
Priority date: 2008-07-02
Filing date: 2009-06-22
Publication date: 2010-01-07
Also published as: CN101621459B; CN101621459A

Abstract

A message transfer method includes that: an interworking proxy node IWP obtains the address of a data gateway; the IWP allocates an address used for identifying itself, and sends an IP packet carrying the address allocated by the IWP to the data gateway; the IP packet sent by the data gateway is received, and the destination address of the IP packet sent by the data gateway is the address allocated by the IWP.

Description

Message passing method, interworking proxy node, data gateway and network system The application is submitted to the Chinese Patent Office on July 2, 2008, and the application number is 200810127640.3, and the invention name is "message delivery method, interworking proxy node, data gateway and network system". The priority of the Chinese Patent Application, the entire contents of which is incorporated herein by reference. Technical field

The present invention relates to the field of communication technologies, and in particular, to a message delivery method, an interworking proxy node, a data gateway, and a network system.

Background technique

With the development of telecommunication technology, the mobile packet network is developed from the 3G network to the EPS (Evolved Packet System), and the core network of the mobile packet network is also the traditional GPRS (General Packet Radio Service). The network evolved to EPC (Evolved Packet Core, Evolved Packet Core).

The EPC network includes: MME (Mobility Management Entity), SGW (Serving GW, Serving Gateway), and PGW (PDN GW, PDN Gateway).

Under the different PLMNs (Public Land Mobile Network), the SGW and PGW may support different protocols. For example, the visited network uses the GTP (GPRS Tunnel Protocol) protocol. The SGW of the network only supports the GTP protocol, and the home network uses the PMIP (Proxy Mobile IP) protocol. The PGW located in the home network only supports the PMIP. Therefore, there is a problem of interworking between the PMIP and the GTP network.

In the prior art, an IWP (Interworking Proxy) is used between the SGW and the PGW to attempt to implement interworking between the SGW and the PGW. Currently, the IWP is transparent to the SGW and the PGW, and the PMIP transmitted between the PGW and the SGW. The destination address of the /GTP protocol is the IP address of the peer end. The destination address of the IP packet sent by the PGW to the SGW is different from the destination address of the IP packet sent by the SGW to the PGW. The inventor found in the process of implementing the present invention, when the network In the case where multiple IWPs are stored in the network, the IP network is usually routed according to the destination address. Therefore, the IP network may route the packets of the same PDN to different IWPs, and the interworking between the SGW and the PGW cannot be implemented. .

Summary of the invention The embodiments of the present invention provide a message delivery method, an interworking proxy node, a data gateway, and a network system, which can ensure that IP packets of the same PDN are routed to the same IWP to implement interworking between the SGW and the PGW.

In view of this, the embodiments of the present invention include:

A messaging method, including:

Interworking proxy node IWP obtains the address of the data gateway;

The IWP is allocated to identify its own address, and sends an IP packet carrying the address allocated by the IWP to the data gateway;

And receiving an IP packet sent by the data gateway, where a destination address of the IP packet sent by the data gateway is an address allocated by the IWP.

An interworking proxy node, comprising:

a data gateway address obtaining unit, configured to obtain an address of the data gateway;

An address allocation unit, configured to allocate an address for identifying the interworking proxy node;

a data gateway side message sending unit, configured to send, according to an address of the data gateway acquired by the data gateway address obtaining unit, an IP packet carrying an address allocated by the address allocation unit to the data gateway;

The data gateway side message receiving unit is configured to receive the IP packet sent by the data gateway, and the destination address of the IP packet sent by the data gateway is an address allocated by the interworking proxy node.

A data gateway, including:

An address receiving unit, configured to receive an IP packet sent by the IWP, where the IP packet carries an address allocated by the IWP;

And a sending unit, configured to send an IP packet to the IWP, where the destination address of the IP packet is an address allocated by the IWP.

A network system, comprising: an interworking proxy node IWP and a data gateway,

The interworking proxy node IWP is configured to obtain an address of the data gateway, allocate an address for identifying itself, and send an IP packet carrying the address allocated by the IWP to the data gateway; and receive the IP sent by the data gateway. Message

The data gateway is configured to receive an IP packet carrying an address allocated by the IWP, and send an IP packet whose destination address is an address allocated by the IWP. The embodiments of the present invention have the following beneficial effects:

In the embodiment of the present invention, the data gateway is notified of the address assigned by the IWP, so that the data gateway uses the address assigned by the IWP as the destination address of the IP packet, so as to ensure that the IP packets connected by the same PDN are routed to the same IWP, and the SGW and the SGW are implemented. Interworking between PGWs.

DRAWINGS

1 is a flowchart of a message delivery method according to Embodiment 1 of the present invention;

2 is a flowchart of a message delivery method according to Embodiment 2 of the present invention;

3 is a flowchart of a message delivery method according to Embodiment 3 of the present invention;

4 is a flowchart of a message delivery method according to Embodiment 4 of the present invention;

Figure 5 is a structural diagram of an IWP provided in Embodiment 5 of the present invention;

6 is a structural diagram of a data gateway provided by Embodiment 6 of the present invention;

FIG. 7 is a structural diagram of a network system according to Embodiment 7 of the present invention.

detailed description

An embodiment of the present invention provides a message delivery method, including: an interworking proxy node IWP acquires an address of a data gateway; an IWP is configured to identify an address of the IWP, and send an IP packet carrying the address allocated by the IWP to the data gateway. Receiving an IP packet sent by the data gateway, and a destination address of the IP packet sent by the data gateway is an address allocated by the IWP. The technical solution provided by the embodiment of the present invention ensures that IP packets connected by the same PDN are routed to the same IWP.

Referring to FIG. 1, a first embodiment of the present invention provides a message delivery method, in which a PMIP protocol is used between an SGW and an IWP, and a GTP protocol is used between an IWP and a PGW. The method includes:

Step A: The UE sends an attach request to the MME through the eNodeB.

Step A2: The MME obtains an APN (Access Point Name) from the HSS, and obtains an address of the PGW according to the APN. The MME sends a Create Default Bear Request to the SGW, where the request carries the address and user of the PGW. Identification, APN and other information.

Step A3: The SGW allocates a Proxy-CoA (Proxy Care-of Address) of the PMIP protocol, and sends a PBU (Proxy Binding Update) message to the PGW, where the message carries the Proxy-CoA of the PMIP protocol. (Proxy Care-of Address) Address and GRE Key (Generic Routing Encapsulation Key), user ID, APN, etc. Address), the destination address is the PGW address, the IP network selects the IWP, routes the PBU message to the IWP, and then routes the IP packets of the same destination address to the IWP.

There are two ways in which an IP network can select an IWP:

According to the static configuration of the network, the IP network selects the IWP according to the destination address, and all IP packets with the same destination address are routed to a configured IWP. Alternatively, the IP network randomly receives the first IP packet received by the same destination address. An IWP is selected, and IP packets with the same destination address are routed to the IWP.

Step A4: The IWP allocates a GTP control plane address (GTP-C address) and a GTP user plane address (GTP-U address) for identifying the IWP when the subsequent PGW sends control messages and data packets. The IWP allocates the GTP control plane TEID and the GTP user plane TEID (Tunnel Endpoint Identifier), or obtains the GTP control plane TEID and the GTP user plane TEID according to the GRE key in the PBU message. For example, all or part of the GRE Key may be utilized. To generate a TEID, the IWP sends a default bearer request Create Default Bear Request to the PGW. The message includes: GTP-C address, GTP-U address, GTP control plane TEID, GTP user plane TEID, user ID, APN letter obtained. The Proxy-CoA assigned by the SGW, the destination address of the IP header field is the address of the PGW.

Step A5: After receiving the default bearer request, the PGW establishes a PDN connection between the IWP and the PGW, and the PGW allocates a GTP user plane address (GTP-U address), a GTP control plane TEID, and a GTP user plane TEID, and sends the creation to the IWP. The default bearer response is Create Default Bear Response. The message carries the GTP-C address (that is, the address of the PGW), the GTP-U address assigned by the PGW, and the GTP control plane.

TEID and GTP user plane TEID. The source address of the IP header field in the message is the address of the PGW, and the destination address is the GTP-C address assigned by the IWP.

Step A6: After receiving the default bearer response, the IWP sends a proxy binding response (PBA mobile anchor address), a GRE key, and a terminal IP address information to the SGW, where the LMAA address of the PMIP protocol is the address of the PGW, and the GRE Key can It is allocated by the IWP, and can also be obtained according to the GTP control plane TEID and the GTP user plane TEID allocated by the PGW. The source address of the IP header field of the proxy binding response message is the LMAA address of the PMIP protocol, and the destination address is the Proxy-CoA address. Step A7: The SGW sends a default bearer setup response to the MME. Create Default Bearer Response

Step A8: The MME sends an attach accept message to the UE by using the eNodeB.

At this point, the UE has completed the attachment, and establishes a PDN connection between the UE and the PGW, and the subsequent UE can transmit and receive the uplink and downlink data packets.

For the uplink data sent by the UE, the SGW is sent by the GRE (Generic Routing Encapsulation) tunnel of the PMIP, and the destination address of the uplink data packet is the LMAA address of the PMIP protocol (that is, the PGW address), and the IP network will The uplink data packet is routed to the IWP, and then the IWP is sent to the PGW through the GTP user plane tunnel of the GTP protocol. The destination address of the uplink data packet is the GTP-U address allocated by the PGW.

For the downlink data packet from the network side, the PGW sends the GTP user plane tunnel to the IWP through the GTP protocol. The destination address of the downlink data packet is the GTP-U address of the GTP protocol (the GTP-U address assigned by the IWP); IWP After receiving the downlink data, the destination address of the downlink data packet is the Proxy-CoA address allocated by the SGW.

The subsequent SGW and the PGW may also send control messages to modify, delete, and the like of the PDN connection between the UE and the PGW.

For the control message sent by the SGW to the PGW, including the request and response message, the SGW sends the PMGW through the PMIP protocol, and the destination address is the LMAA address of the PMIP protocol (ie, the PGW address), and the IP network routes the control message to the IWP, and then the IWP. The GTP control plane tunnel of the GTP protocol is sent to the PGW, and the destination address is the GTP-C address of the PGW.

For the control message sent by the PGW to the SGW, including the request and response message, the PGW sends the GTP to the IWP through the GTP control plane tunnel of the GTP protocol, and the destination address is the GTP-C address of the GTP protocol (the GTP-C address allocated by the IWP); After receiving the control message of the PGW, the IWP sends the control message to the SGW through the PMIP protocol. The destination address is the Proxy-CoA address allocated by the SGW.

When the GTP protocol is used between the IWP and the PGW, the first embodiment of the present invention notifies the data gateway of the address assigned by the IWP (the GTP-C address and the GTP-U address), so that the address assigned by the data gateway by the IWP is an IP packet. The destination address is used to ensure that IP packets connected to the same PDN are routed to the same IWP.

Referring to FIG. 2, a second embodiment of the present invention provides a method for message delivery, in which a GTP protocol is used between an SGW and an IWP, and a PMIP protocol is used between the IWP and the PGW. The method includes: Step B1: The UE sends an attach request to the MME through the eNodeB.

Step B2: The MME obtains an APN (Access Point Name) from the HSS, obtains an address of the PGW according to the APN, and sends a Create Default Bear Request to the SGW, where the request carries the address of the PGW.

Step B3. The SGW allocates a GTP control plane address (GTP-C address) and a GTP user plane address (GTP).

- U address), GTP control plane TEID and GTP user plane TEID, send a default bearer request Create Default Bear Request to the PGW, the GTP-C address, GTP-U address, GTP control plane TEID, GTP allocated by the SGW in the message User plane TEID, user ID, APN information.

The source address in the IP header field is the GTP-C address assigned by the SGW, and the destination address is the PGW address. The IP network routes the IP packets of the same destination address to an IWP, and routes the default bearer request to the IWP.

The JP network similar to the first embodiment can route IP packets of the same destination address to an IWP in the following two ways:

In the step B4, the IWP allocates the Proxy-CoA address and the GRE key of the PMIP protocol, and obtains the user identifier and the APN information from the create default bearer request, and sends a PBU message to the PGW, where the message includes: the IWP assigns the Proxy-Co A of the PMIP protocol. Address, GRE Key, User ID, APN Information. The source address in the IP header field of the message is the Proxy-CoA address assigned by the IWP to the PMIP protocol, and the destination address is the PGW address.

Step B5: The PGW receives the above-mentioned Create Default Bearer Request, establishes a corresponding PDN connection between the IWP and the PGW, allocates an IP address of the UE, acquires a QoS parameter, and allocates a GRE Key; and sends a PBA message to the IWP, where the message carries GRE Key, the IP address of the UE, and the LM AA address of the PMIP protocol, where the LMAA address of the PMIP protocol is the PGW address. The destination address of the message is the Proxy-CoA address assigned by the IWP, and the source address is the PGW address.

The PBA message belongs to a control response message.

Step B6: After receiving the PBA message, the IWP uses the LMAA address in the PBA message as the GTP-C. Address, assign GTP-U address, IWP assigns GTP control plane TEID, GTP user plane TEID, or obtains GTP control plane TEID and GTP user plane TEID according to the GRE key in the PBA message, and obtains the IP address information of the UE from the PBA message. The default bearer response is sent to the PGW. The message includes: GTP-C address, GTP-U address, GTP control plane TEID, GTP user plane TEID, and UE IP address information. The destination address in the IP header field of the message is the GTP-C address allocated by the SGW, and the source address is the LMAA address of the PMIP protocol allocated by the PGW.

Step B7: The SGW sends a default bearer setup response Create Default Bearer Response to the MME.

Step B8: The MME sends an attach accept message to the UE by using the eNodeB.

For the uplink data packet sent by the UE, the SGW sends an uplink data packet through the GTP user plane tunnel of the GTP, and the destination address is the GTP-U address sent by the IWP to the SGW in step B6; the IWP is sent through the GRE tunnel of the PMIP protocol. The uplink data packet whose destination address is the LMAA address of the PMIP protocol (that is, the address of the PGW);

For the downlink data of the network side, the PGW sends the downlink data packet through the GRE tunnel of the PMIP protocol, and the destination address is the Proxy-CoA address allocated by the IWP. The IWP sends the downlink data packet through the GTP user plane tunnel of the GTP protocol. Its destination address is the GTP-U address assigned by the SGW.

The control message sent by the SGW to the PGW, including the request and the response message, is sent by the SGW through the GTP protocol, and the destination address is the GTP-C address (ie, the PGW address) of the GTP protocol in the step B6, and the IP network routes the control packet to the The IWP, then the IWP is sent to the PGW via the PMIP protocol, and the destination address is the LMAA address of the PGW in the PMIP protocol.

For the control message sent by the PGW to the SGW, including the request and response messages, the PGW sends the IGW to the IWP through the PMIP protocol, and the destination address is the Proxy-Co A address of the PMIP protocol (the Proxy-CoA address allocated by the IWP); the IWP receives the PGW. After the packet is controlled, it is sent to the SGW through the GTP protocol. The destination address is the GTP-C address allocated by the SGW.

In the second embodiment of the present invention, when the PMIP protocol is used between the IWP and the PGW, the IWP is allocated. The address (Proxy-CoA) notifies the data gateway that the address assigned by the data gateway by the IWP is the destination address of the IP packet, and the service gateway is notified to the service gateway by the GTP-U address assigned by the IWP. Text and control messages are routed to the same IWP.

Referring to FIG. 3, a third embodiment of the present invention provides a message delivery method, in which a PMIP protocol is used between an SGW and an IWP, and a GTP protocol is used between an IWP and a PGW. The difference from the first embodiment is that the SGW obtains the IWP. The address is sent to the IWP directly. The method includes: Step CI: The UE sends an attach request to the MME by using the eNodeB.

Step C2: The MME acquires an IWP address used for communication with the serving gateway.

The MME can obtain the address of the IWP by:

The first way: Obtained through a DNS query. In the existing DNS (Domain Name System) configuration information, for each APN that only supports the GTP protocol, an IWP record is inserted. The DNS configuration information is as follows:

For APN, it is Cmnet.cmcc, and there are two records in the DNS server, which are PGW1 and

PGW2, both support GTP protocol, for APN is Cmwap.cmcc, in the DNS server corresponding to two records, respectively, PGW3 and PGW4; In order to obtain the IWP address, you can insert the IWP record in the DNS configuration information, as shown in Table 1. The black emphasis font indicates that the APN is Cmnet.cmcc, Cmwap.cmcc, so that when the PMIP protocol is used, the IWP can be selected.

The MME searches Table 1 according to the APN and the supported PMIP protocol, and obtains the address of the corresponding IWP. The second way: obtained through local configuration; does not insert IWP records in the DNS, such as DNS configuration information as shown in Table 2: APN PGW GW Protocol Used

Cmnet.cmcc PGW1 GTP

Cmnet.cmcc PGW2 GTP

Cmwap.cmcc PGW3 GTP

Cmwap.cmcc PGW4 GTP

For APN, it is Cmnet.cmcc, and there are two records corresponding to the DNS server, PGW1 and PGW2, both of which support GTP. For APN, it is Cmwap.cmcc, and the DNS server corresponds to two records, which are PGW3 and PGW4 respectively.

When the user roams to the visited network using the PMIP protocol, the MME searches the table 2 according to the APN and the supported PMIP protocol, and cannot obtain the address of the corresponding PGW. Therefore, it is considered that the home network does not support the PMIP protocol, and the IWP needs to be obtained according to the local configuration. the address of.

The MME may locally configure a correspondence between the home network and the IWP address, and obtain an address of the IWP according to the home network, where the home network may be obtained from the APN. For example, the correspondence between the home network and the IWP address is as shown in Table 3:

table 3

If the APN is cmnet.cmcc, its home network is cmcc, and its corresponding IWP is IWP2. The MME can also locally configure the mapping between the APN and the IWP address, and obtain the IWP address according to the APN, such as the correspondence between the APN and the IWP address. As shown in Table 4:

Table 4

If the APN is cmnet.cmcc, its corresponding IWP is IWP2. In this step, the MME may also obtain the address of the PGW according to the APN; may notify the IWP of the address of the PGW, and in order to notify the IWP of the address of the PGW, add a D4 interface between the MME and the IWP, and the MME sends a Forward_PGW_Address on the D4 interface ( Forward the data gateway address) message, the address of the PGW is passed in the message.

Step C3: The MME sends a default bearer request to the SGW, where the message carries an IWP address. In order to carry the IWP address information in the above-mentioned create default request, a parameter may be extended in the existing create bearer default request, for example, an IWP_Address parameter, for transmitting the IWP address. Or use the existing parameter of the PGW address to transmit the IWP address; if the MME does not notify the IWP of the PGW address in the above step C2, the MME needs to notify the SGW of the PGW address in this step, and utilizes the existing parameter of the PGW address. The IWP address is passed, and a parameter can be extended in the creation of the bearer default request, such as the PGW_Address parameter, which is used to pass the address of the PGW.

Step C4: The SGW allocates a Proxy_CoA address and a GRE Key of the PMIP protocol, and sends a PBU message to the IWP, where the message includes: a Proxy_CoA address, a GRE Key, a user identifier, and an APN information, and the source address is a Proxy_CoA address allocated by the SGW.

If the MME notifies the SGW of the PGW address in the previous step, the SGW may carry the PGW address in the PBU message, and specifically may extend a Connected-Addr Option in the PBU message for use in the PBU. Pass the PGW address in the message.

The PBU message belongs to a control request message.

Step C5: After receiving the PBU message, the IWP allocates the GTP control plane address (GTP-C address) and the GTP user plane address (GTP-U address), and the IWP allocates the GTP control plane TEID and the GTP user plane TEID, or according to the PBU message. The GRE key obtains the GTP control plane TEID and the GTP user plane TEID. For example, all or part of the GRE key can be used to generate the TEID, and then the default bearer request Create Default Bear Request is sent to the PGW, and the message includes: GTP- C address, GTP-U address, GTP control plane TEID, GTP user plane TEID, user ID, APN information. The destination address in the IP header field of the message is the address of the PGW, and the source address is the GTP-C allocated by the IWP or the Proxy CoA allocated by the SGW.

If the PBU information received by the IWP does not include the address information of the PGW, and the MME does not notify the IWP of the PGW address in the step C1, the IWP needs to obtain a PGW address, and the IWP can pass the following Acquisition:

The first way: Through the APN, query the DNS server to obtain the PGW address.

The second way: obtain the PGW address by querying the HSS or AAA server;

The third method is as follows: Configure the mapping between the APN and the PGW address on the IWP, and query the local configuration through the APN to obtain the PGW address.

The fourth method is: querying the MME, adding a D4 interface between the MME and the IWP, the IWP sends a PGW_Address_Request message to the MME on the D4 interface, and the MME sends a PGW_Address_Response message to the IWP, and transmits the address of the PGW in the response message.

Step C6: After receiving the default bearer request, the PGW establishes a PDN connection between the IWP and the PGW, allocates the IP address of the UE, obtains the QoS parameter, and allocates the GTP user plane address (GTP-U address) and the GTP control plane TEID. The GTP user plane TEID is sent to the IWP to create a default bearer response, where the response includes: a GTP-C address, a GTP-U address, a GTP control plane TEID, and a GTP user plane TEID allocated by the PGW; The source address of the IP header field in the bearer response is created, and the GTP-C address in the default bearer request is created as the destination address.

Step C7: After receiving the default bearer response, the IWP sends a PBA message to the SGW, where the message carries the GRE Key and the terminal IP address information, where the GRE Key may be allocated by the IWP or may be based on the GTP control plane TEID allocated by the PGW. Obtained with the GTP user plane TEID, the source address in the PBA header field is the LMAA address of the PMIP protocol (the address of the IWP obtained in step C3;), and the destination address is the Proxy-CoA address allocated by the SGW.

Step C8: The SGW sends a default bearer setup response to the MME. Create Default Bearer

Response.

Step C9: The MME sends an attach accept message to the UE by using the eNodeB.

For the uplink data packet sent by the UE, the SGW sends the IGW to the IWP through the GRE tunnel of the PMIP. The destination address is the LMAA address of the PMIP protocol (the address of the IWP obtained in step C3), and the IWP passes the GTP user plane tunnel of the GTP protocol to the PGW. Send, whose destination address is the GTP-U address assigned by the PGW;

For the downlink data packet sent by the network side, the PGW passes the GTP user plane tunnel of the GTP protocol. The IWP is sent, and the destination address is the GTP-U address assigned by the IWP. The IWP sends the downlink data packet to the SGW through the GRE tunnel of the PMIP. The destination IP address is the Proxy-CoA address allocated by the SGW of the PMIP protocol.

Similarly, the subsequent SGW and the PGW may also send control messages to modify, delete, and the like of the PDN connection between the UE and the PGW.

For the control message sent by the SGW to the PGW, including the request and response messages, the SGW is sent by the PMIP protocol, the destination address is the LMAA address of the PMIP protocol (the IWP address obtained in step C3), and then the IWP passes the GTP control plane of the GTP protocol. The tunnel is sent to the PGW, and the destination address is the GTP-C address of the PGW.

For the control message sent by the PGW to the SGW, including the request and response message, the PGW sends the GTP to the IWP through the GTP control plane tunnel of the GTP protocol, and the destination address is the GTP-C address of the GTP protocol (the GTP-C address allocated by the IWP); After receiving the control message of the PGW, the IWP sends the control message to the SGW through the PMIP protocol. The destination address is the Proxy-Co A address allocated by the SGW.

When the GTP protocol is used between the IWP and the PGW, the third embodiment of the present invention notifies the data gateway of the address assigned by the IWP (the GTP-C address and the GTP-U address), so that the address assigned by the data gateway by the IWP is an IP packet. The destination address is used to ensure that IP packets connected to the same PDN are routed to the same IWP. In addition, the SGW obtains an IWP address for communicating with the service gateway, and directly sends the control packet and the uplink data packet to the IWP, and does not need to configure the routing IP packet through the IP network.

Referring to FIG. 4, a fourth embodiment of the present invention provides a message delivery method, in which a GTP protocol is used between an SGW and an IWP, and a PMIP protocol is used between an IWP and a PGW. The difference from the second embodiment is that the SGW obtains the IWP. The address, the control information is directly sent to the IWP, and the method specifically includes: Step D1 - Step D3 is the same as Step C1 - Step C3.

Step D4: The SGW allocates a GTP control plane address (GTP-C address), a GTP user plane address (GTP-U address), a GTP control plane TEID, and a GTP user plane TEID, and sends a default bearer request Create Default Bear Request to the PGW. The GTP-C address, the GTP-U address, the GTP control plane TEID, the GTP user plane TEID, the user identifier, and the APN information allocated by the SGW in the message; the destination address of the IP header field in this message is the GTP-C address of the IWP, SGW The address of the IWP obtained in step D3 is taken as the GTP-C address of the IWP, and the source address is the GTP-C address assigned by the SGW.

If in the previous step, the MME notifies the SGW of the PGW address, the SGW may create the missing The province bearer request carries the PGW address. Specifically, the connection gateway Connect-Gw parameter is extended, and the parameter is carried in the default bearer request to transmit the PGW address. .

Step D5: The IWP allocates the Proxy-CoA address and the GRE key of the PMIP protocol, and obtains the user identifier and the APN information from the create default bearer request, and sends a PBU message to the PGW, where the message includes: the Proxy-CoA address assigned by the IWP, and the GRE Key, user ID, APN information. The source address in the IP header field of the message is the Proxy-CoA address assigned by the IWP, the destination address is the LMAA address of the PMIP protocol, and the IWP uses the PGW address as the LMAA address of the PMIP protocol.

If the PGW information received by the IWP does not include the address information of the PGW, and the MME does not notify the IWP of the PGW address in the step D1, the IWP needs to acquire a PGW address, and the acquisition manner is the same as that in the third embodiment.

Step D6: The PGW receives the above-mentioned Create Default Bearer Request, establishes a corresponding PDN connection between the IWP and the PGW, allocates the IP address of the UE, acquires the QoS parameter, and allocates the GRE Key; and sends a PBA message to the IWP, where the message carries GRE Key, the IP address of the UE, and the LMAA address of the PMIP protocol, where the LMAA address of the PMIP protocol is the PGW address. The destination address of the message is the Proxy-CoA address assigned by the IWP, and the source address is the PGW address.

Step D7: After receiving the PBA message, the IWP allocates a GTP-U address, and the IWP allocates a GTP control plane TEID, a GTP user plane TEID, or obtains a GTP control plane TEID, a GTP user plane TEID, and a PBA message according to the GRE Key in the PBA message. Obtaining the IP address information of the UE, and sending a default bearer response to the PGW, where the message includes: a GTP-C address of the IWP (ie, an address of the IWP obtained in step D3), a GTP-U address, a GTP control plane TEID, GTP user plane TEID and UE IP address information. The destination address in the IP header field of the message is the GTP-C address allocated by the SGW, and the source address is the GTP-C address of the IWP (that is, the address of the IWP obtained in step D3).

Step D8: The SGW sends a default bearer setup response to the MME. Create Default Bearer Response

Step D9: The MME sends an attach accept message to the UE by using the eNodeB.

The process of transmitting and receiving the uplink and downlink data packets is the same as that of the uplink and downlink data packets in the second embodiment.

The subsequent SGW and the PGW may also send control messages to modify, delete, and the like of the PDN connection between the UE and the PGW. The control message sent by the SGW to the PGW, including the request and response message, is sent by the SGW through the GTP protocol, and the destination address is the GTP-C address of the IWP in the GTP protocol (ie, the IWP address obtained in step D3), and the IP network will The control message is routed to the IWP, and then the IWP is sent to the PGW through the PMIP protocol, and the destination address is the LMAA address of the PGW in the PMIP protocol.

In the fourth embodiment of the present invention, when the PMIP protocol is used between the IWP and the PGW, the address assigned by the IWP is notified to the data gateway by the address assigned by the IWP (Proxy-CoA), so that the address assigned by the data gateway by the IWP is the destination address of the IP packet; The assigned GTP-U address informs the service gateway to enable the service gateway to send

The PDN connection data message and control message are routed to the same IWP. In addition, the SGW obtains an IWP address for communicating with the service gateway, and sends the control packet directly to the IWP. The IP network does not need to be configured to route IP packets.

In the foregoing embodiment of the present invention, the scenario in which the IWP is used for the protocol conversion is described as an example. The method provided by the embodiment of the present invention can also be applied to the scenario where the SGW and the PGW use the same protocol, and the same PDN connection can be ensured. The IP packets are routed to the same IWP for purposes.

Referring to FIG. 5, a fifth embodiment of the present invention provides an interworking proxy node, including:

a data gateway address obtaining unit 501, configured to obtain an address of the data gateway;

The address allocation unit 502 is configured to allocate an address for identifying the interworking proxy node; the data gateway side message sending unit 503 is configured to send, to the data gateway, an IP packet that carries the address allocated by the address allocation unit;

The data gateway side message receiving unit 504 is configured to receive an IP packet sent by the data gateway, where the data gateway address obtaining unit 501 is configured to receive a new D4 interface between the MME and the interworking proxy node. The data gateway address passed; or receiving the data gateway address initiated by the MME and forwarded via the serving gateway.

The device further includes: a service gateway side message receiving unit 505, which includes: a service gateway side control a message receiving unit, configured to receive a control packet sent by the serving gateway, where the destination address of the control packet is a data gateway address or an interworking proxy node address used for communication with the serving gateway, where the control packet includes a control request The data gateway side message sending unit 503 is configured to send, after the service gateway side control message receiving unit receives the control request message, an address that carries the IWP allocation to the data gateway, and the destination address is The control request message of the data gateway address.

The address allocation unit 502 includes: a first address allocation unit, configured to allocate a GTP-U address and a GTP-C address. At this time, the data gateway side message receiving unit 504 is configured to receive the downlink data packet sent by the data gateway, where the destination address of the downlink data packet is the GTP-U allocated by the first address allocation unit; or, the receiving station The control packet sent by the data gateway, where the destination address of the control packet is the GTP-C allocated by the first address allocation unit. The serving gateway side message receiving unit 505 further includes: a serving gateway side uplink data packet receiving unit, configured to receive an uplink data packet sent by the serving gateway, where a destination address of the uplink data packet is the data gateway address Or the interworking proxy node address used to communicate with the serving gateway.

And/or, the address allocation unit 502 includes: a second address allocation unit for allocating a Proxy-CoA. At this time, the data gateway side message receiving unit 504 is configured to receive the downlink data packet or the control packet sent by the data gateway, where the destination address of the downlink data packet or the control packet is allocated by the second address allocation unit. Proxy-CoA. The interworking proxy node further includes: a third address allocating unit 506, configured to: when the IP packet received by the data gateway side message receiving unit is a control response message, allocate a GTP-U address; the service gateway side message sending unit 507, The serving gateway sends the IP packet carrying the GTP-U address of the IWP to the serving gateway. The serving gateway side message receiving unit 505 further includes: a serving gateway side uplink data packet receiving unit, configured to receive the sending by the serving gateway The uplink data packet, the destination address of the uplink data packet is that the GTP-IL sending unit 503 allocated by the third address allocation unit sends the allocated address to the data gateway, so that the data gateway uses the address allocated by the IWP as the IP packet. The destination address of the text is to ensure that the IP packets of the same PDN connection are routed to the same IWP.

Referring to FIG. 6, a sixth embodiment of the present invention provides a data gateway, including:

The address receiving unit 601 is configured to receive an IP packet sent by the IWP, where the IP packet carries an address allocated by the IWP;

The sending unit 602 is configured to send an IP packet to the IWP, where the destination address of the IP packet is the IWP The assigned address.

In the sixth embodiment of the present invention, the address receiving unit 601 receives the address allocated by the IWP, and the destination address of the IP packet sent by the sending unit 602 is the address allocated by the IWP, so as to ensure that the IP packets connected by the same PDN are routed to the same IWP. on.

Referring to FIG. 7, a sixth embodiment of the present invention provides a network system, including:

The MME is configured to obtain an IWP address for communicating with the serving gateway, and send the information to the serving gateway. The serving gateway is configured to receive the IWP address used for communicating with the serving gateway, and sending the destination address to the IWP is IP packet of the IWP address communicated with the service gateway;

The interworking proxy node IWP is configured to obtain an address of the data gateway, allocate an address for identifying the user, and send an IP packet carrying the address allocated by the IWP to the data gateway; and receive the IP packet sent by the data gateway. ;

The data gateway is configured to receive an IP packet carrying the address allocated by the IWP, and send an IP packet whose destination address is an address allocated by the IWP.

Specifically, the MME obtains the used gateway from the DNS according to the access point name APN and the corresponding relationship between the APN preset in the DNS of the domain name system and the IWP address used for communication with the serving gateway. The IWP address of the communication; or, the MME learns the protocol supported by the home network according to the APN, and obtains the service and service according to the correspondence between the protocol supported by the home network and the IWP address used for communication with the service gateway. The IWP address of the gateway communication; or, the MME acquires the IWP address used for communication with the serving gateway according to the preset relationship between the preset APN and the IWP address used for communication with the serving gateway.

The address assigned by the IWP to identify itself is a GTP-U address and a GTP-C address. At this time, the IP packet sent by the data gateway received by the IWP includes: a downlink data packet whose destination address is a GTP-U address, or a control packet whose destination address is a GTP-C address. The IWP is further configured to receive a control packet or an uplink data packet sent by the serving gateway, where the destination address of the control packet or the uplink data packet is a data gateway address or an IWP address used for communication with the serving gateway.

Or, the address assigned by the IWP to identify itself is Proxy-CoA. At this time, the IP packet sent by the data gateway received by the IWP includes: a downlink data packet or a control packet carrying the Proxy-CoA; when the IP packet sent by the data gateway is a control response packet, the IWP is also used by the IWP. Assigning a GTP-U address, and sending an IP packet carrying the GTP-U address assigned by the IWP to the serving gateway; The IWP is also used to receive the control message sent by the serving gateway as the data gateway address or the IWP address used for communication with the serving gateway. The destination address sent by the receiving service gateway is the GTP-U uplink data packet.

In the seventh embodiment of the present invention, the interworking proxy node IWP allocates an address and notifies the data gateway, so that the data gateway can use the address assigned by the IWP as the destination address of the IP packet, and ensure that the IP packets connected by the same PDN are routed to the same IWP. Further, protocol conversion can be performed through the same IWP to implement interworking between the SGW and the PGW.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is a better implementation. the way. Based on such understanding, the essential machine software product of the present invention is stored in a readable storage medium, such as a floppy disk, a hard disk or an optical disk of a computer, and includes a plurality of instructions for causing a computer device (which may be a personal computer, The server, or network device, etc.) performs the methods described in various embodiments of the present invention.

The foregoing describes the message delivery method, the interworking proxy node, and the data gateway provided by the embodiments of the present invention. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. Meanwhile, the general technology in the field In the following, the description of the present invention is not limited to the scope of the present invention.

Claims

Rights request

A message delivery method, comprising:

Interworking proxy node IWP obtains the address of the data gateway;

2. The method of claim 1 wherein

The address of the acquiring data gateway is specifically:

Receiving, by the mobility management entity, an address of the data gateway that is transmitted by the MME through an interface with the IWP;

Or,

Receiving an IP packet initiated by the MME and forwarded by the serving gateway, and obtaining a data gateway address from the IP packet;

Or,

The data gateway address corresponding to the APN carried in the control request message from the service gateway is obtained according to the correspondence between the pre-configured access point name APN and the data gateway address.

The method according to claim 1, wherein before the sending the IP packet carrying the address allocated by the IWP to the data gateway, the method further includes:

The MME obtains an IWP address for communicating with the serving gateway, and sends the IWP address to the serving gateway. The serving gateway sends an IP packet to the IWP according to the IWP address.

4. The method of claim 3, wherein

The IWP address obtained by the MME for communicating with the service gateway is specifically:

The MME obtains the IWP used for communication with the serving gateway from the DNS according to the access point name APN and the correspondence between the APN preset in the DNS of the domain name system and the IWP address used for communication with the serving gateway. Address

Or,

Determining, by the MME, the home network according to the APN, and acquiring, according to the preset relationship between the preset network and the IWP address, the IWP address corresponding to the determined home network for communicating with the serving gateway; or,

The MME obtains the IWP address used for communication with the serving gateway according to the preset relationship between the preset APN and the IWP address used for communication with the serving gateway.

5. A method according to any one of claims 1 - 4, characterized in that

When the general wireless packet service tunneling protocol GTP is used between the IWP and the data gateway, the address allocated by the IWP for identifying itself includes a general wireless packet service tunneling protocol user plane GTP-U address and a general wireless packet service tunneling protocol control plane. The GTP-C address, the receiving the IP packet sent by the data gateway includes:

And receiving, by the data gateway, a downlink data packet, where the destination address of the downlink data packet is the GTP-U address allocated by the IWP;

Or,

And receiving, by the data gateway, a control packet, where the destination address of the control packet is the GTP-C address allocated by the IWP.

6. A method according to any one of claims 1 - 4, characterized in that

When the proxy mobile IP protocol PMIP is used between the IWP and the data gateway, the address used by the IWP to identify itself is the proxy care-of address Proxy-CoA, and the receiving the data gateway sends the ΙΡ·艮:

And receiving, by the data gateway, a downlink data packet or a control packet, where the destination address of the downlink data packet or the control packet is the Proxy-CoA allocated by the IWP.

7. The method of claim 6 further comprising:

The received IP packet sent by the data gateway is a control response packet;

After receiving the control response message sent by the data gateway, the method further includes:

The IWP allocates a GTP-U address;

Sending, by the IWP, an IP packet carrying the GTP-U address to the serving gateway;

And receiving an uplink data packet sent by the serving gateway, where the destination address of the uplink data packet is a GTP-U address allocated by the IWP.

8. An interworking proxy node, comprising:

An address allocation unit, configured to allocate an address for identifying the interworking proxy node; a data gateway side message sending unit, configured to send, according to the address of the data gateway acquired by the data gateway address obtaining unit, an IP packet carrying the address allocated by the address allocation unit to the data gateway;

The interworking proxy node according to claim 8, wherein the interworking proxy node further comprises:

The service gateway side control message receiving unit is configured to receive a control message sent by the service gateway, where the destination address of the control message is a data gateway address or an interworking proxy node address used for communication with the service gateway, the control report The text includes a control request message;

The data gateway side message sending unit is configured to: after the service gateway side control message receiving unit receives the control request message, send an address assigned by the interworking proxy node to the data gateway, and the destination address is the Control request message of the data gateway address.

10. The interworking proxy node of claim 8 wherein:

The address allocation unit includes: a first address allocation unit, configured to allocate a GTP-U address and a GTP-C address when the GTP protocol is used between the interworking proxy node and the data gateway;

The data gateway side message receiving unit is configured to receive a downlink data packet sent by the data gateway, where a destination address of the downlink data packet is a GTP-U allocated by the first address allocation unit; or The control packet sent by the data gateway, where the destination address of the control packet is the GTP-C allocated by the first address allocation unit.

11. The interworking proxy node of claim 8 wherein:

The address allocation unit includes: a second address allocation unit, configured to allocate a Proxy-CoA when the PMIP protocol is used between the interworking proxy node and the data gateway;

The data gateway side message receiving unit is configured to receive a downlink data message or a control message sent by the data gateway, where the destination address of the downlink data message or the control message is a Proxy-Co A allocated by the IWP. .

The interworking proxy node according to claim 11, wherein the interworking proxy node further comprises:

a third address allocation unit, configured to: when the IP gateway received by the data gateway side message receiving unit is controlled When the response text is processed, the GTP-U address is assigned;

a service gateway side message sending unit, configured to send, to the serving gateway, an IP packet carrying a GTP-U address allocated by the third address allocation unit;

The serving gateway side uplink data packet receiving unit is configured to receive an uplink data packet sent by the serving gateway, where a destination address of the uplink data packet is allocated by the third address allocation unit

13. A data gateway, comprising:

A network system, comprising: an interworking proxy node IWP and a data gateway, the interworking proxy node IWP, configured to acquire an address of a data gateway, allocate an address for identifying oneself, and send the data gateway to the data gateway Sending an IP packet carrying the address allocated by the IWP; receiving an ΙΡ·艮 message sent by the data gateway;

The data gateway is configured to receive an IP packet carrying an address allocated by the IWP, and send an IP packet whose destination address is an address allocated by the IWP.

The network system according to claim 14, wherein the system further comprises: an MME, configured to acquire an IWP address for communicating with the serving gateway, and send the IWP address to the serving gateway; and the serving gateway is configured to receive the An IWP address for communicating with the serving gateway, and transmitting an IP4 message to the IWP according to the IWP address.