CN101621459B - Messaging method, interworking agent node, data gateway and network system - Google Patents

Messaging method, interworking agent node, data gateway and network system Download PDF

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Publication number
CN101621459B
CN101621459B CN2008101276403A CN200810127640A CN101621459B CN 101621459 B CN101621459 B CN 101621459B CN 2008101276403 A CN2008101276403 A CN 2008101276403A CN 200810127640 A CN200810127640 A CN 200810127640A CN 101621459 B CN101621459 B CN 101621459B
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address
iwp
message
gateway
gtp
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CN101621459A (en
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周青
银宇
胡颖
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/04—Network layer protocols, e.g. mobile IP [Internet Protocol]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/18—Service support devices; Network management devices
    • H04W88/182—Network node acting on behalf of an other network entity, e.g. proxy

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  • Databases & Information Systems (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The embodiment of the invention provides a messaging method, an interworking agent node, a data gateway and a network system, wherein the messaging method comprises the following steps: the interworking agent node IWP obtains the address of the data gateway; the IWP assigns an address used for identifying itself and sends an IP message carrying the address assigned by the IWP to the data gateway; the IP message sent from the data gateway is received, and the target address of the IP message sent from the data gateway is the address assigned by the IWP. With the technical scheme provided by the inventive embodiment, the IP message connected by a same PDN can be ensured to be routed to the same IWP.

Description

Message transmission method, intercommunication proxy node, data gateway and network system
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a message transmission method, an interworking agent node, a data gateway, and a network system.
Background
With the development of telecommunication technology, mobile Packet networks are developed from 3G networks to EPS (Evolved Packet system), and Core networks of mobile Packet networks are also developed from conventional GPRS networks to EPC (Evolved mobile Packet Core).
Wherein, EPC network includes: MME (Mobility Management Entity), SGW (Serving GW), and PGW (PDN GW, PDN gateway).
Under the condition that the SGW and the PGW are located in different PLMNs (Public Land Mobile Network), the protocols supported by the SGW and the PGW may be different, for example, the visited Network uses a GTP (GPRS Tunnel Protocol) Protocol, the SGW located in the visited Network only supports the GTP Protocol, the home Network uses a PMIP (Proxy Mobile IP) Protocol, and the PGW located in the home Network only supports the PMIP, so that the PMIP and the GTP Network are in interworking.
In the prior art, an IWP (Interworking Proxy node) is adopted between an SGW and a PGW to attempt to realize Interworking between the SGW and the PGW, the IWP is transparent to the SGW and the PGW at present, a destination address of a PMIP/GTP protocol transmitted between the PGW and the SGW is an IP address of an opposite end, and a destination address of an IP packet sent by the PGW to the SGW is different from a destination address of an IP packet sent by the SGW to the PGW.
Disclosure of Invention
Embodiments of the present invention provide a message transmission method, an interworking agent node, a data gateway, and a network system, which can ensure that IP packets connected to the same PDN are routed to the same IWP, so as to implement interworking between an SGW and a PGW.
In view of this, the embodiment of the present invention includes:
a method of messaging, comprising:
the interworking agent node IWP acquires the address of the data gateway;
IWP allocates an address for identifying itself and sends an IP message carrying the address allocated by IWP to the data gateway;
and receiving the IP message sent by the data gateway, wherein the destination address of the IP message sent by the data gateway is the address distributed by the IWP.
An interworking agent node, comprising:
a data gateway address obtaining unit, configured to obtain an address of a data gateway;
an address allocation unit for allocating an address for identifying the interworking agent node;
a data gateway side message sending unit, configured to send, to the data gateway, an IP packet carrying the address allocated by the address allocation unit according to the address of the data gateway acquired by the data gateway address acquisition unit;
and the data gateway side message receiving unit is used for receiving the IP message sent by the data gateway, and the destination address of the IP message sent by the data gateway is the address distributed by the interworking agent node.
A data gateway, comprising:
an address receiving unit, configured to receive an IP packet sent by an IWP, where the IP packet carries an address allocated by the IWP;
and the sending unit is used for sending the IP message to the IWP, and the destination address of the IP message is the address distributed by the IWP.
A network system, comprising: an interworking agent node IWP and a data gateway,
the interworking agent node IWP is used for acquiring the address of the data gateway, allocating the address for identifying the interworking agent node IWP, and sending an IP message carrying the address allocated by the IWP to the data gateway; receiving an IP message sent by the data gateway;
and the data gateway is used for receiving the IP message carrying the address allocated by the IWP and sending the IP message of which the destination address is the address allocated by the IWP.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention informs the data gateway of the address distributed by the IWP, so that the data gateway takes the address distributed by the IWP as the destination address of the IP message, thereby ensuring that the IP messages connected with the same PDN are routed to the same IWP and realizing the intercommunication between the SGW and the PGW.
Drawings
Fig. 1 is a flowchart of a message delivery method according to an embodiment of the present invention;
fig. 2 is a flowchart of a message delivery method according to a second embodiment of the present invention;
fig. 3 is a flowchart of a message delivery method according to a third embodiment of the present invention;
fig. 4 is a flowchart of a message passing method according to a fourth embodiment of the present invention;
fig. 5 is a diagram of an IWP according to a fifth embodiment of the present invention;
fig. 6 is a diagram of a data gateway structure according to a sixth embodiment of the present invention;
fig. 7 is a diagram of a network system according to a seventh embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a message transmission method, which comprises the following steps: the interworking agent node IWP acquires the address of the data gateway; IWP allocates an address for identifying itself and sends an IP message carrying the address allocated by IWP to the data gateway; and receiving the IP message sent by the data gateway, wherein the destination address of the IP message sent by the data gateway is the address distributed by the IWP. By using the technical scheme provided by the embodiment of the invention, the IP messages connected with the same PDN can be ensured to be routed to the same IWP.
Referring to fig. 1, an 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, and the method specifically includes:
step a1, the UE sends an attach request to the MME via the eNodeB.
Step A2, MME obtains APN (Access Point Name) from HSS, and obtains the address of PGW according to APN, MME sends Create default bearer Request to SGW, the Request carries the address of PGW, user identification, APN and other information.
Step a3, the SGW allocates a Proxy-CoA of the PMIP protocol, and sends a PBU (Proxy binding Update) message to the PGW, where the message carries information such as a Proxy Care-of-Address (Proxy CoA-of-Address) Address and a GRE Key of the PMIP protocol, a user identifier, and an APN.
The source address in the IP header field of the message is the address of the SGW (i.e. the Proxy-CoA address allocated by the SGW), the destination address is the PGW address, the IP network selects the IWP, routes the PBU message to the IWP, and subsequently routes the IP packet with the same destination address to the IWP.
The manner of selecting the IWP by the IP network may be as follows:
the IP network selects IWP according to the static configuration of the network and the destination address, all IP messages with the same destination address are routed to the IWP with the configuration; or the IP network randomly selects an IWP for the first IP message received by the same destination address, and the subsequent IP messages with the same destination address are all 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 the subsequent PGW to send a response packet, and identifies the IWP during the subsequent control packet and data packet. The IWP allocates a GTP control plane TEID and a GTP user plane TEID, or obtains the GTP control plane TEID and the GTP user plane TEID according to the GRE Key in the PBU message, for example, the TEID may be generated by using all or a part of the GRE Key, and then the IWP sends a Create Default bearer Request Create Default Bear Request to the PGW, where the message includes: GTP-C address, GTP-U address, GTP control plane TEID, GTP user plane TEID, user identification and APN information. The source address of the IP header field of the message may be the IWP assigned GTP-C address or the SGW assigned Proxy-CoA obtained from the PBU message, and the destination address of the IP header field is the address of the PGW.
Step A5, after the PGW receives the request for creating the Default bearer, a PDN connection is established between the IWP and the PGW, the PGW distributes a GTP user plane address (GTP-U address), a GTP control plane TEID and a GTP user plane TEID, and sends a Create Default bearer Response Create Default bearer Bear Response to the IWP, wherein the message carries a GTP-C address (namely the address of the PGW), a GTP-U address distributed by the PGW, a GTP control plane TEID and a 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 allocated by the IWP.
Step A6, after IWP receives the default bearer creating response, it sends proxy binding response PBA message to SGW, the message carries LMAA address, GRE Key and terminal IP address information of PMIP protocol, the LMAA address of PMIP protocol is the address of PGW, GRE Key can be distributed by IWP, also can be obtained according to GTP control plane TEID and GTP user plane TEID distributed by 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 Create Default BearerResponse to the MME.
Step A8, MME sends an attach accept message to UE through eNodeB.
So far, the UE has completed the attachment, and establishes the PDN connection between the UE and the PGW, and the subsequent UE can send and receive the uplink and downlink data packets.
For an uplink data message sent by the UE, the SGW sends the uplink data message through the GRE tunnel of the PMIP, where a destination address of the uplink data message is an LMAA address (i.e., PGW address) of the PMIP protocol, the IP network routes the uplink data message to the IWP, and then the IWP sends the uplink data message to the PGW through a GTP user plane tunnel of the GTP protocol, where the destination address of the uplink data message is a GTP-U address allocated by the PGW.
For a downlink data message from a network side, a PGW sends the downlink data message to an IWP through a GTP user plane tunnel of a GTP protocol, and the destination address of the downlink data message is a downlink GTP-U address of the GTP protocol (a GTP-U address distributed by the IWP); and after receiving the downlink data message, the IWP sends the downlink data message through a GRE tunnel of a PMIP protocol, wherein the destination address of the downlink data message is a Proxy-CoA address distributed by the SGW.
The subsequent SGW and PGW may also send a control message to modify, delete, etc. the PDN connection between the UE and the PGW.
For a control message sent by the SGW to the PGW, including a request and a response message, the SGW sends the control message through the PMIP protocol, where a destination address is an LMAA address (i.e., PGW address) of the PMIP protocol, the IP network routes the control message to the IWP, and then the IWP sends the control message to the PGW through a GTP control plane tunnel of the GTP protocol, where the destination address is a GTP-C address of the PGW.
For a control message sent by a PGW to an SGW, the control message comprises a request message and a response message, the PGW sends the control message to an IWP through a GTP control plane tunnel of a GTP protocol, and a target address is a downlink GTP-C address of the GTP protocol (a GTP-C address distributed by the IWP); and after receiving the control message of the PGW, the IWP sends the control message to the SGW through a PMIP protocol, wherein the destination address is a Proxy-CoA address distributed by the SGW.
In the first embodiment of the present invention, when a GTP protocol is used between an IWP and a PGW, the data gateway notifies the data gateway of the addresses (GTP-C address and GTP-U address) allocated by the IWP, so that the data gateway uses the address allocated by the IWP as the destination address of the IP packet, thereby ensuring that the 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 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, and the method specifically includes:
step B1, the UE sends an attach request to the MME via the eNodeB.
Step B2, MME obtains APN (Access Point Name) from HSS, obtains address of PGW according to APN, sends Create Default bearer request Create Default BearRequest to SGW, the request carries address of PGW.
And step B3, 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 Create Default bearer Request Create Default bearer Bear Request to the PGW, wherein 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 source address in the IP header field of the message is a GTP-C address distributed by the SGW, the destination address is a PGW address, the IP network routes the IP message of the same destination address to an IWP, and the default bearer request is routed to the IWP.
Similar to the embodiment 1, the IP network may route IP packets with the same destination address to an IWP in the following two ways:
the IP network selects IWP according to the static configuration of the network and the destination address, all IP messages with the same destination address are routed to the IWP with the configuration; or the IP network randomly selects an IWP for the first IP message received by the same destination address, and the subsequent IP messages with the same destination address are all routed to the IWP.
Step B4, IWP distributes Proxy-CoA address and GRE Key of PMIP protocol, obtains user identification and APN information from creating default load-bearing request, and sends PBU message to PGW, the message includes: IWP distributes Proxy-CoA address, GRE Key, user identification and APN information of PMIP protocol. The source address in the IP header field of the message is the Proxy-CoA address of IWP allocated PMIP protocol, and the destination address is the PGW address.
Step B5, the PGW receives the request for creating default load, establishes 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 sending a PBA message to the IWP, wherein the message carries the GRE Key, the IP address of the UE and the LMAA address of the PMIP protocol, and the LMAA address of the PMIP protocol is the PGW address. The destination address of the message is the Proxy-CoA address allocated by the IWP, and the source address is the PGW address.
Step B6, after the IWP receives the PBA message, using the LMAA address in the PBA message as the GTP-C address, allocating the GTP-U address, the IWP allocates the GTP control plane TEID and the GTP user plane TEID, or obtaining the GTP control plane TEID and the GTP user plane TEID according to the GRE Key in the PBA message, obtaining the IP address information of the UE from the PBA message, and sending a default bearer creating response to the PGW, wherein the message comprises: GTP-C address, GTP-U address, GTP control plane TEID, GTP user plane TEID and IP address information of UE. The destination address in the message IP header field is a GTP-C address allocated by the SGW, and the source address is an LMAA address of PMIP protocol allocated by the PGW.
Step B7, the SGW sends a Default bearer setup response Create Default BearerResponse to the MME.
Step B8, the MME sends an attach accept message to the UE via the eNodeB.
So far, the UE has completed the attachment, and establishes the PDN connection between the UE and the PGW, and the subsequent UE can send and receive the uplink and downlink data packets.
For the uplink data message sent by the UE, the SGW sends the uplink data message through a GTP user plane tunnel of the GTP protocol, and the destination address of the uplink data message is the GTP-U address sent by the IWP in step B6 to the SGW; IWP sends upstream data message through GRE tunnel of PMIP protocol, its destination address is LMAA address (i.e. address of PGW) of PMIP protocol;
for the downlink data message at the network side, the PGW sends the downlink data message through a GRE tunnel of a PMIP protocol, the destination address of the downlink data message is a Proxy-CoA address distributed by the IWP, the IWP sends the downlink data message through a GTP user plane tunnel of a GTP protocol, and the destination address of the downlink data message is a GTP-U address distributed by the SGW.
The subsequent SGW and PGW may also send a control message to modify, delete, etc. the PDN connection between the UE and the PGW.
For the control packet sent by the SGW to the PGW, including the request and the response message, the SGW sends the control packet via the GTP protocol, where the destination address is the GTP-C address (i.e., PGW address) of the GTP protocol in step B6, the IP network routes the control packet to the IWP, and then the IWP sends the IWP to the PGW via the PMIP protocol, where the destination address is the LMAA address of the PGW in the PMIP protocol.
For a control message sent by a PGW to an SGW, the control message comprises a request message and a response message, the PGW sends the request message to an IWP through a PMIP protocol, and a destination address is a Proxy-CoA address (Proxy-CoA address distributed by the IWP) of the PMIP protocol; and after receiving the control message of the PGW, the IWP sends the control message to the SGW through a GTP protocol, wherein the destination address is a GTP-C address distributed 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-allocated address (Proxy-CoA) is notified to the data gateway, so that the data gateway uses the IWP-allocated address as the destination address of the IP packet, and the IWP-allocated GTP-U address is notified to the service gateway, so that the service gateway uses the IWP-allocated GTP-U address as the destination address of the IP packet when sending the uplink data packet, thereby ensuring that the same PDN connection data packet and the control packet 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, and the difference from the first embodiment is that the SGW obtains an IWP address and directly sends control information to the IWP, and the method specifically includes:
step C1, the UE sends an attach request to the MME via the eNodeB.
Step C2, the MME acquires the IWP address for communicating with the serving gateway.
The MME may obtain the address of the IWP by:
the first mode is as follows: obtained by DNS query. In the existing DNS (Domain Name System) configuration information, for each APN supporting only the GTP protocol, a record of IWP is inserted, and the DNS configuration information is as follows in table 1:
APN PGW GW Protocol Used
Cmnet.cmcc PGW1 GTP
Cmnet.cmcc PGW2 GTP
Cmwap.cmcc PGW3 GTP
Cmwap.cmcc PGW4 GTP
Cmnet.cmcc IWP1 address PMIP
Cmwap.cmcc IWP1 address PMIP
TABLE 1
Cmnet.cmcc for APN, PGW1 and PGW2 for DNS server, both supporting GTP protocol, cmwap.cmcc for APN, PGW3 and PGW4 for DNS server; to obtain the address of the IWP, a record of the IWP may be inserted in the DNS configuration information, as indicated by the black accent in table 1, indicating that cmnet.
And the MME searches the table 1 according to the APN and the supported PMIP protocol to acquire the corresponding IWP address.
The second mode is as follows: obtained through local configuration; a record of the IWP is not inserted in the DNS, such as the DNS configuration information as shown in table 2 below:
APN PGW GW Protocol Used
Cmnet.cmcc PGW1 GTP
Cmnet.cmcc PGW2 GTP
Cmwap.cmcc PGW3 GTP
Cmwap.cmcc PGW4 GTP
TABLE 2
Cmnet.cmcc for APN, PGW1 and PGW2 for DNS server, both supporting GTP protocol, cmwap.cmcc for APN, PGW3 and PGW4 for DNS server;
when the user roams to the visited network using the PMIP protocol, the MME cannot acquire the address of the corresponding PGW according to the APN and the supported PMIP protocol, look up table 2, and therefore, it is considered that the home network does not support the PMIP protocol, and the IWP address needs to be acquired according to the local configuration.
The MME can configure the corresponding relation between the home network and the address of the IWP locally, and obtain the address of the IWP according to the home network, wherein the home network can be obtained from the APN. For example, the correspondence between the home network and the IWP address is shown in table 3:
home network IWP address
ct IWP1 address
cmcc IWP2 address
TABLE 3
Cmcc, its home network is cmcc, its corresponding IWP is IWP 2;
the MME may also configure the correspondence between the APN and the IWP address locally, and obtain the address of the IWP according to the APN, for example, the correspondence between the APN and the IWP address is shown in table 4:
APN IWP address
Ctwap.ct IWP1 address
Ctnet.ct IWP1 address
Cmwap.cmcc IWP2 address
Cmnet.cmcc IWP2 address
TABLE 4
Cmcc, if the APN is cmnet, its corresponding IWP is IWP 2.
In this step, the MME may further obtain an address of the PGW according to the APN; the IWP may be notified of the Address of the PGW, and in order to notify the IWP of the Address of the PGW, a D4 interface is added between the MME and the IWP, and the MME sends a Forward _ PGW _ Address message on the D4 interface, where the message conveys the Address of the PGW.
Step C3, MME sends a request for creating bearer default to SGW, and the message carries IWP address.
In order to carry the Address information of the IWP in the default request for creating the bearer, a parameter, for example, an IWP _ Address parameter, may be extended in the existing default request for creating the bearer for communicating the IWP Address. Or the IWP address is transmitted by using the existing parameters for transmitting the PGW address; if the MME does not notify the IWP of the PGW Address in step C2, in this step, the MME needs to notify the SGW of the PGW Address, and the IWP Address is also delivered by using the existing parameters for delivering the PGW Address, a parameter, for example, a PGW _ Address parameter, may be extended in the request for creating a bearer default to deliver the PGW Address.
Step C4, SGW distributes Proxy _ CoA address and GRE Key of PMIP protocol, and sends PBU message to IWP, the message includes: proxy _ CoA address, GRE Key, user identity, and APN information, the destination address of the IP header field in this message is the LMAA address of PMIP protocol (the address of IWP obtained in step C3), and the source address is the Proxy _ CoA address assigned by the SGW.
If in the above step, the MME notifies the SGW of the PGW address, the SGW may carry the PGW address in the PBU message, and specifically may extend a Connected-AddrOption (connection address option) in the PBU message, for transferring the PGW address in the PBU message.
Step C5, after the IWP receives the PBU message, the IWP allocates a GTP control plane address (GTP-C address) and a GTP user plane address (GTP-U address), the IWP allocates a GTP control plane TEID and a GTP user plane TEID, or obtains the GTP control plane TEID and the GTP user plane TEID according to the GRE Key in the PBU message, for example, the TEID may be generated by using all or a part of the GRE Key, and then sends a Create Default bearer Request Create Default Bear Request to the PGW, where the message includes: GTP-C address, GTP-U address, GTP control plane TEID, GTP user plane TEID, user identification and 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 step C1, the IWP needs to acquire a PGW address, and the IWP may acquire the PGW address in the following manner:
the first mode is as follows: and querying a DNS server through the APN to obtain the PGW address.
The second mode is as follows: obtaining a PGW address by inquiring an HSS or an AAA server;
the third mode is as follows: configuring a corresponding relation between an APN and a PGW address on an IWP, and inquiring local configuration through the APN to obtain the PGW address;
the fourth mode is that: and inquiring the MME, adding a D4 interface between the MME and the IWP, sending a PGW _ Address _ Request message to the MME by the IWP on the D4 interface, sending a PGW _ Address _ Response message to the IWP by the MME, and transmitting the Address of the PGW in the Response message.
Step C6, after receiving the request for creating default bearer, the PGW establishes PDN connection between the IWP and the PGW, allocates the IP address of the UE, obtains QoS parameters, allocates a GTP user plane address (GTP-U address), a GTP control plane TEID, and a GTP user plane TEID, and sends a response for creating default bearer to the IWP, where the response includes: the PGW is distributed with a GTP-C address, a GTP-U address, a GTP control plane TEID and a GTP user plane TEID; and taking the PGW address as the source address of the IP header field in the default bearer creating response, and taking the GTP-C address in the default bearer creating request as the destination address.
Step C7, after IWP receives the default bearer creating response, sending PBA message to SGW, the message carrying GRE Key and terminal IP address information, wherein GRE Key can be allocated by IWP, or can be obtained according to GTP control plane TEID and GTP user plane TEID allocated by PGW, the source address in PBA header field is LMAA address of PMIP protocol (the address of IWP acquired in step C3), the destination address is Proxy-CoA address allocated by SGW.
Step C8, the SGW sends a Default bearer setup response Create Default bearer response to the MME.
Step C9, the MME sends an attach accept message to the UE via the eNodeB.
So far, the UE has completed the attachment, and establishes the PDN connection between the UE and the PGW, and the subsequent UE can send and receive the uplink and downlink data packets.
For the uplink data message sent by the UE, the SGW sends the IWP through the GRE tunnel of the PMIP, where the destination address is the LMAA address of the PMIP protocol (the address of the IWP obtained in step C3), the IWP sends the PGW through the GTP user plane tunnel of the GTP protocol, and the destination address is the GTP-U address allocated by the PGW;
for a downlink data message sent by a network side, a PGW sends the downlink data message to an IWP through a GTP user plane tunnel of a GTP protocol, and the destination address of the downlink data message is a GTP-U address distributed by the IWP), the IWP sends the downlink data message to an SGW through a GRE tunnel of a PMIP, and the destination IP address of the downlink data message is a Proxy-CoA address distributed by the SGW of the PMIP protocol.
Similarly, the subsequent SGW and PGW may also send a control message to modify, delete, etc. the PDN connection between the UE and the PGW.
For the control packet sent by the SGW to the PGW, including the request and the response message, the SGW sends the control packet through the PMIP protocol, where the destination address is the LMAA address of the PMIP protocol (the IWP address obtained in step C3), and then the IWP sends the control packet to the PGW through the GTP control plane tunnel of the GTP protocol, where the destination address is the GTP-C address of the PGW.
For a control message sent by a PGW to an SGW, the control message comprises a request message and a response message, the PGW sends the control message to an IWP through a GTP control plane tunnel of a GTP protocol, and a target address is a downlink GTP-C address of the GTP protocol (a GTP-C address distributed by the IWP); and after receiving the control message of the PGW, the IWP sends the control message to the SGW through a PMIP protocol, wherein the destination address is a Proxy-CoA address distributed by the SGW.
In the third embodiment of the present invention, when a GTP protocol is used between the IWP and the PGW, the data gateway notifies the IWP-allocated addresses (GTP-C address and GTP-U address) to use the IWP-allocated address as the destination address of the IP packet, so as to ensure that the IP packets connected to the same PDN are routed to the same IWP. And the SGW acquires an IWP address for communicating with the service gateway and directly sends the control message and the uplink data message to the IWP without configuring a routing IP message through an 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, and the difference from the second embodiment is that the SGW obtains an IWP address and directly sends control information 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 Create Default bearer Request Create Default Bear Request to the PGW, wherein 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, the SGW takes the address of the IWP obtained in step D3 as the GTP-C address of the IWP, and the source address is the GTP-C address allocated by the SGW.
If in the above step, the MME notifies the SGW of the PGW address, the SGW may carry the PGW address in the request to create the default bearer, and specifically, may carry the parameter in the request to create the default bearer to transfer the PGW address by extending a Connect-Gw parameter.
Step D5, IWP distributes Proxy-CoA address and GRE Key of PMIP protocol, obtains user identification and APN information from creating default load-bearing request, and sends PBU message to PGW, the message includes: and the Proxy-CoA address, the GRE Key, the user identifier and the APN information distributed by the IWP. The source address in the IP header field of the message is a Proxy-CoA address distributed by the IWP, the destination address is an LMAA address of the PMIP protocol, and the IWP takes the PGW address as the LMAA address of the PMIP protocol.
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 step C1, the IWP needs to acquire one PGW address, which is the same as the embodiment.
Step D6, the PGW receives the request for creating default load, establishes 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 sending a PBA message to the IWP, wherein the message carries the GRE Key, the IP address of the UE and the LMAA address of the PMIP protocol, and the LMAA address of the PMIP protocol is the PGW address. The destination address of the message is the Proxy-CoA address allocated by the IWP, and the source address is the PGW address.
Step D7, after the IWP receives the PBA message, it distributes GTP-U address, the IWP distributes GTP control plane TEID and GTP user plane TEID, or obtains GTP control plane TEID and GTP user plane TEID according to GRE Key in PBA message, obtains IP address information of UE from PBA message, sends the created default load response to PGW, the message includes: the GTP-C address of the IWP (i.e. the address of the IWP obtained in step D3), the GTP-U address, the GTP control plane TEID, the GTP user plane TEID and the IP address information of the UE. Wherein the destination address in the IP header field of the message is the GTP-C address assigned by the SGW and the source address is the GTP-C address of the IWP (i.e., the address of the IWP obtained in step D3).
Step D8, the SGW sends a Default bearer setup response Create Default BearerResponse to the MME.
Step D9, the MME sends an attach accept message to the UE via the eNodeB.
Until now, the UE has completed the attachment, and the process of sending and receiving the uplink and downlink data packets by the subsequent UE is the same as the process of sending and receiving the uplink and downlink data packets in the second embodiment, which is not repeated here.
The subsequent SGW and PGW may also send a control message to modify, delete, etc. the PDN connection between the UE and the PGW.
For the control packet sent by the SGW to the PGW, including the request and the response message, the SGW sends the control packet through the GTP protocol, where the destination address is the GTP-C address of the IWP in the GTP protocol (i.e., the IWP address obtained in step D3), the IP network routes the control packet to the IWP, and then the IWP sends the IWP to the PGW through the PMIP protocol, where the destination address is the lma address of the PGW in the PMIP protocol.
For a control message sent by a PGW to an SGW, the control message comprises a request message and a response message, the PGW sends the request message to an IWP through a PMIP protocol, and a destination address is a Proxy-CoA address (Proxy-CoA address distributed by the IWP) of the PMIP protocol; and after receiving the control message of the PGW, the IWP sends the control message to the SGW through a GTP protocol, wherein the destination address is a GTP-C address distributed by the SGW.
In the fourth embodiment of the present invention, when a PMIP protocol is used between an IWP and a PGW, a data gateway is notified of an address (Proxy-CoA) allocated by the IWP, so that the data gateway uses the address allocated by the IWP as a destination address of an IP packet; by informing the service gateway of the GTP-U address distributed by the IWP, the service gateway takes the GTP-U address distributed by the IWP as the destination address of the IP message when sending the uplink data message, thereby ensuring that the same PDN connection data message and the control message are routed to the same IWP. And the SGW acquires an IWP address for communicating with the service gateway and directly sends the control message to the IWP without configuring a routing IP message through an IP network.
In the above embodiment of the present invention, a scenario in which an IWP is used as a protocol conversion is taken as an example for description, and the method provided in the embodiment of the present invention may also be applied to a scenario in which an SGW and a PGW use the same protocol, and may also achieve the purpose of ensuring that IP packets connected to the same PDN are routed to the same IWP.
Referring to fig. 5, an embodiment of the present invention provides an interworking agent node, including:
a data gateway address obtaining unit 501, configured to obtain an address of a data gateway;
an address assignment unit 502 for assigning an address for identifying the interworking agent node;
a data gateway side message sending unit 503, configured to send an IP packet carrying the address allocated by the address allocating unit to the data gateway;
a data gateway side message receiving unit 504, configured to receive 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 interworking agent node.
Specifically, the data gateway address obtaining unit 501 is configured to receive a data gateway address transmitted through a D4 interface newly added between the MME and the interworking agent node; or, receiving the data gateway address initiated by the MME and forwarded via the serving gateway.
The apparatus further comprises: the service gateway side message receiving unit 505 includes: a service gateway side control message receiving unit, configured to receive a control message sent by a service gateway, where a destination address of the control message is a data gateway address or an interworking proxy node address used for communicating with the service gateway, and the control message includes a control request message; the data gateway side message sending unit 503 is configured to send, after the control message receiving unit receives the control request message, a control request message carrying an address allocated by the IWP and having a destination address that is the data gateway address to the data gateway.
The address allocation unit 502 includes: and the first address allocation unit is used for allocating the GTP-U address and the GTP-C address. At this time, the data gateway side message receiving unit 504 is configured to receive a downlink data message sent by the data gateway, where a destination address of the downlink data message is a GTP-U allocated by the first address allocating unit; or receiving a control message sent by the data gateway, wherein the destination address of the control message is GTP-C allocated by the first address allocation unit. The service gateway side message receiving unit 505 further includes: and the uplink data message receiving unit is used for receiving the uplink data message sent by the service gateway, and the destination address of the uplink data message is the address of the data gateway or the address of the interworking agent node for communicating with the service gateway.
And/or, the address allocation unit 502 includes: a second address assigning unit for assigning a Proxy-CoA. At this time, the data gateway side message receiving unit 504 is configured to receive a downlink data message or a control message sent by the data gateway, where a destination address of the downlink data message or the control message is a Proxy-CoA allocated by the second address allocating unit. The interworking agent node further includes: a third address allocating unit 506, configured to allocate a GTP-U address when the IP packet received by the data gateway side message receiving unit is a control response packet; a service gateway side message sending unit 507, configured to send an IP packet carrying a GTP-U address allocated by the IWP to the service gateway; the service gateway side message receiving unit 505 further includes: and the service gateway side uplink data message receiving unit is used for receiving the uplink data message sent by the service gateway, and the destination address of the uplink data message is the GTP-U allocated by the third address allocation unit.
In the fifth embodiment of the present invention, the address allocating unit 502 allocates an address of an IWP, and the data gateway side message sending unit 503 sends the allocated address to the data gateway, so that the data gateway uses the address allocated by the IWP as a destination address of an IP packet, thereby ensuring that IP packets connected to the same PDN are routed to the same IWP.
Referring to fig. 6, a sixth embodiment of the present invention provides a data gateway, including:
an address receiving unit 601, configured to receive an IP packet sent by an IWP, where the IP packet carries an address allocated by the IWP;
a sending unit 602, configured to send an IP packet to an IWP, where a destination address of the IP packet is an address allocated by the IWP.
In the sixth embodiment of the present invention, the address receiving unit 601 receives an address allocated by an 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 IP packets connected to the same PDN are routed to the same IWP.
Referring to fig. 7, an embodiment of the present invention provides a network system, including:
the MME is used for acquiring an IWP address used for communicating with the serving gateway and sending the IWP address to the serving gateway;
the service gateway is used for receiving the IWP address used for communicating with the service gateway and sending an IP message of which the destination address is the IWP address used for communicating with the service gateway to the IWP;
the interworking proxy node IWP is used for acquiring the address of the data gateway, allocating the address for identifying the interworking proxy node IWP and sending an IP message carrying the address allocated by the IWP to the data gateway; receiving an IP message sent by the data gateway;
and the data gateway is used for receiving the IP message carrying the address allocated by the IWP and sending the IP message of which the destination address is the address allocated by the IWP.
Specifically, the MME acquires the IWP address for communicating with the service gateway from the DNS according to the APN and by using the corresponding relation between the APN preset in a Domain Name System (DNS) and the IWP address for communicating with the service gateway; or, the MME acquires a protocol supported by a home network according to the APN, and acquires the IWP address used for communicating with the service gateway according to the corresponding relation between the preset protocol supported by the home network and the IWP address used for communicating with the service gateway; or, the MME acquires the IWP address for communicating with the service gateway according to the corresponding relation between the preset APN and the IWP address for communicating with the service gateway.
Wherein, the IWP allocates the GTP-U address and the GTP-C address for identifying the IWP. At this time, the IP packet sent by the data gateway received by the IWP includes: the destination address is a downlink data message of a GTP-U address, or the destination address is a control message of a GTP-C address. The IWP is also used for receiving a control message or an uplink data message sent by the service gateway, and the destination address of the control message or the uplink data message is the address of the data gateway or the address of the IWP used for communication with the service gateway.
Alternatively, the address allocated 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: carrying a downlink data message or a control message of Proxy-CoA; when the received IP message sent by the data gateway is a control response message, the IWP is also used for distributing a GTP-U address and sending the IP message carrying the GTP-U address distributed by the IWP to the service gateway;
the IWP is also used for receiving a control message of which the destination address sent by the service gateway is a data gateway address or an IWP address used for communicating with the service gateway; and receiving the uplink data message of which the destination address is GTP-U sent by the service gateway.
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 allocated by the IWP as the destination address of the IP packet, thereby ensuring that the IP packets connected to 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 above description of the embodiments, those skilled in the art will clearly understand that the present invention can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present invention may be substantially implemented or a part of the technical solutions contributing to the prior art may be embodied in the form of a software product, which is stored in a readable storage medium, such as a floppy disk, a hard disk, or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
The message transmission method, the interworking agent node, the data gateway and the network system provided by the embodiment of the present invention are described in detail above, a specific example is applied in the present document to explain the principle and the implementation of the present invention, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (15)

1. A method of messaging, comprising:
the interworking agent node IWP acquires the address of the data gateway;
IWP allocates an address for identifying itself and sends an IP message carrying the address allocated by IWP to the data gateway;
and receiving the IP message sent by the data gateway, wherein the destination address of the IP message sent by the data gateway is the address distributed by the IWP.
2. The method of claim 1,
the acquiring the address of the data gateway specifically comprises:
receiving the address of a data gateway transmitted by a mobility management entity MME through an interface between the mobility management entity MME and the IWP;
or,
receiving an IP message initiated by a Mobility Management Entity (MME) and forwarded by a service gateway, and acquiring a data gateway address from the IP message;
or,
and acquiring a data gateway address corresponding to the APN carried in the control request message according to a preset corresponding relation between the APN and the data gateway address.
3. The method of claim 1, wherein prior to sending an IP packet carrying the IWP assigned address to the data gateway, the method further comprises:
a mobility management entity MME acquires an IWP address used for communicating with a service gateway and sends the IWP address to the service gateway;
and the service gateway sends an IP message to the IWP according to the IWP address.
4. The method of claim 3,
the MME acquiring an IWP address for communicating with a serving gateway specifically is:
the MME acquires the IWP address for communicating with the service gateway from the DNS according to the APN and by utilizing the corresponding relation between the APN preset in the domain name system DNS and the IWP address for communicating with the service gateway;
or,
the MME acquires a protocol supported by a home network according to the APN, and acquires an IWP address for communicating with a service gateway according to a preset corresponding relation between the protocol supported by the home network and the IWP address for communicating with the service gateway;
or,
and the MME acquires the IWP address for communicating with the service gateway according to the corresponding relation between the preset APN and the IWP address for communicating with the service gateway.
5. The method according to any one of claims 1 to 4,
when a general packet radio service tunneling protocol GTP is used between an IWP and a data gateway, the address allocated by the IWP comprises a general packet radio service tunneling protocol user plane GTP-U address and a general packet radio service tunneling protocol control plane GTP-C address, and then the receiving of the IP message sent by the data gateway comprises:
receiving a downlink data message sent by the data gateway, wherein the destination address of the downlink data message is a GTP-U address in the address allocated by the IWP;
or,
and receiving a control message sent by the data gateway, wherein the destination address of the control message is a GTP-C address in the address allocated by the IWP.
6. The method according to any one of claims 1 to 4,
when an agent mobile IP protocol is used between the IWP and the data gateway, the address allocated by the IWP is an agent care-of address Proxy-CoA, and the receiving of the IP message sent by the data gateway comprises the following steps:
and receiving a downlink data message or a control message sent by the data gateway, wherein the destination address of the downlink data message or the control message is Proxy-CoA (data-assisted architecture) distributed by the IWP.
7. The method of claim 6, further comprising:
the received IP message sent by the data gateway is a control response message;
after receiving the control response message sent by the data gateway, the method further includes:
the IWP allocating a GTP-U address;
the IWP sends an IP message carrying a GTP-U address of a user plane of the general packet radio service tunneling protocol to a service gateway;
and receiving an uplink data message sent by the service gateway, wherein the destination address of the uplink data message is the GTP-U address allocated by the IWP.
8. An interworking agent node, comprising:
a data gateway address obtaining unit, configured to obtain an address of a data gateway;
an address allocation unit for allocating an address for identifying the interworking agent node;
a data gateway side message sending unit, configured to send, to the data gateway, an IP packet carrying the address allocated by the address allocation unit according to the address of the data gateway acquired by the data gateway address acquisition unit;
and the data gateway side message receiving unit is used for receiving the IP message sent by the data gateway, and the destination address of the IP message sent by the data gateway is the address distributed by the interworking agent node.
9. The interworking agent node of claim 8, wherein the interworking agent node further comprises:
a service gateway side control message receiving unit, configured to receive a control message sent by a service gateway, where a destination address of the control message is a data gateway address or an interworking proxy node address used for communicating with the service gateway, and the control message includes a control request message;
and the data gateway side message sending unit is used for sending a control request message carrying an address distributed by an interworking agent node and having a destination address as the data gateway address to the data gateway after the control message receiving unit receives the control request message.
10. Interworking agent node according to claim 8,
the address allocation unit includes: a first address allocation unit, configured to allocate a gprs tunneling protocol user plane GTP-U address and a gprs tunneling protocol control plane GTP-C address when a gprs tunneling protocol 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 message sent by the data gateway, where a destination address of the downlink data message is a GTP-U allocated by the first address allocation unit; or receiving a control message sent by the data gateway, where a destination address of the control message is GTP-C allocated by the first address allocation unit.
11. Interworking agent node according to claim 8,
the address allocation unit includes: a second address allocation unit for allocating Proxy care-of address Proxy-CoA when using Proxy mobile IP protocol between interworking Proxy node and data gateway;
and the data gateway side message receiving unit is used for receiving a downlink data message or a control message sent by the data gateway, wherein the destination address of the downlink data message or the control message is Proxy-CoA (Proxy-CoA) allocated by the IWP (interworking Proxy).
12. The interworking agent node of claim 11, wherein the interworking agent node further comprises:
a third address allocation unit, configured to allocate a GTP-U address of a gprs tunneling protocol user plane when the IP packet received by the data gateway side message receiving unit is a control response packet;
the service gateway side message sending unit is used for sending the IP message carrying the GTP-U address distributed by the third address distribution unit to the service gateway;
and the service gateway side uplink data message receiving unit is used for receiving the uplink data message sent by the service gateway, and the destination address of the uplink data message is the GTP-U allocated by the third address allocation unit.
13. A data gateway, comprising:
an address receiving unit, configured to receive an IP packet sent by an interworking agent node IWP, where the IP packet carries an address allocated by the IWP;
and the sending unit is used for sending the IP message to the IWP, and the destination address of the IP message is the address distributed by the IWP.
14. A network system, comprising: an interworking agent node IWP and a data gateway,
the interworking agent node IWP is used for acquiring the address of the data gateway, allocating the address for identifying the interworking agent node IWP, and sending an IP message carrying the address allocated by the IWP to the data gateway; receiving an IP message sent by the data gateway;
and the data gateway is used for receiving the IP message carrying the address allocated by the IWP and sending the IP message of which the destination address is the address allocated by the IWP.
15. The network system according to claim 14, further comprising:
a mobile management entity MME, which is used for obtaining an IWP address used for communicating with a service gateway and sending the IWP address to the service gateway;
and the service gateway is used for receiving the IWP address used for communicating with the service gateway and sending the IP message to the IWP according to the IWP address.
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