CN101610462B

CN101610462B - Data message sending method, device and communication system

Info

Publication number: CN101610462B
Application number: CN 200810099683
Authority: CN
Inventors: 周青; 银宇; 胡颖
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2008-06-16
Filing date: 2008-06-16
Publication date: 2013-01-02
Anticipated expiration: 2028-06-16
Also published as: WO2009152757A1; CN101610462A

Abstract

The invention relates to the technical field of communication, and discloses a data message sending method, a data message sending device and a communication system. The data message sending method is applied to the switching of a user terminal between networks, and comprises the following steps: when a data channel is not available, sending a protocol context request; receiving a protocol context response responding to the protocol context request, wherein the protocol context response comprises information of an available data channel; and sending data messages through the available data channel. The technical scheme can correctly send uplink data messages when a stored protocol context is not available.

Description

A kind of data message sending method, device and communication system

Technical field

The present invention relates to communication technical field, relate in particular to a kind of data message sending method, device and communication system.

Background technology

Along with the development of telecommunication technology, (3G:the 3 by 3G (Third Generation) Moblie for mobile packet network ^RdGeneration) network is to evolved packet system (EPS:Evolved Packet System) network Development, the core net of mobile packet network is also by mobile packet-based core networks (the EPC:Evolved Packet Core) development of traditional GPRS (GPRS:General PacketRadio Service) network to evolution, in the EPC network, comprise mobile management node (MME:Mobility ManagementEntity), gateway (SGW:Serving GW) and public data network gateway (PGW:PDN GW).MME is positioned at identical Public Land Mobile Nerwork (PLMN:Public Land MobileNetwork) network with SGW, and the interface between them is S11.SGW can be positioned at identical network with PGW, also can be positioned at different PLMN networks.If SGW is positioned at identical PLMN network with PGW, be positioned at home network such as UE, the interface between them is the S5 interface; If SGW is positioned at different PLMN networks with PGW, (UE:User Equipment) is positioned at visited network such as user terminal, is routed to home network by home network route (Home Routed) mode, and the interface between them is the S8 interface.The agreement of S5 interface and S8 interface can be general packet radio service channel protocol (GTP:GPRSTunnel Protocol) or proxy-mobile IP (PMIP:Proxy Mobile IP) agreement.

Wherein, MME need to preserve GTP or the PMIP context between SGW and the PGW, the Path end point that is used for SGW transmission uplink data messages that distributes such as PGW under the GTP agreement identifies (TEID:Tunnel Endpoint Identifier), the Path end point sign is one to one with data channel, the data channel that is used for SGW transmission uplink data messages of definite correspondence that just can be unique when having known this Path end point sign, data channel can be available data channel or disabled data channel; The generic route encapsulation keyword (GRE Key:Generic Routing Encapsulation key) that is used for SGW transmission uplink data messages that perhaps PGW distributes under the PMIP agreement etc., generic route encapsulation keyword and data channel are one to one, the data channel that is used for SGW transmission uplink data messages of definite correspondence that just can be unique when having known this generic route encapsulation keyword, data channel can be available data channel or disabled data channel.Generally, after this GTP or PMIP context are distributed by PGW, notice SGW, SGW reinforms MME.In the situation that adopt the intercommunication node to realize PMIP and GTP protocol conversion, this GTP or PMIP context are distributed by IWP, and IWP notifies SGW, and SGW reinforms MME; When user terminal moves between different visited place Public Land Mobile Nerwork networks (VPLMN), MME in the VPLMN network of source (source MME) sends to MME (target MME) in the target VPLMN network to the context that the interworking agent (IWP:Interworking Proxy) of preserving distributes, target MME passes to SGW (target SGW) in the target VPLMN network to above-mentioned information, and target SGW will use the context information that obtains from MME to send uplink data messages.

In realizing process of the present invention, the inventor finds: in the situation that adopt the intercommunication node to realize PMIP and GTP protocol conversion, when the VPLMN network of user terminal from the VPLMN Network Mobility of a GTP to another GTP, perhaps during the VPLMN network from the VPLMN Network Mobility of a PMIP to another PMIP, the IWP that is used for the user terminal process may not be same, if SGW sends uplink data messages, because new IWP can not identify GREKey or TEID in the context that MME preserves, the context that will cause MME to preserve is unavailable, and uplink data messages is sent unsuccessfully.

Summary of the invention

The embodiment of the invention provides a kind of data message sending method, device and communication system, the technical scheme of using the embodiment of the invention to provide, can be when the context of preserving is unavailable correct transmission uplink data messages.

The purpose of the embodiment of the invention is achieved through the following technical solutions:

The embodiment of the invention provides a kind of data message sending method, is applied to user terminal in internetwork switching, comprising:

When data channel is unavailable, send protocol context request;

Receive the context response of the described protocol context request of response, described context response comprises the information of available data channel;

Send datagram by described available data channel.

The embodiment of the invention also provides a kind of data message dispensing device, is applied to user terminal in internetwork switching, comprising:

Request transmitting unit is used for when described data channel is unavailable, sends protocol context request;

The response receiving element is used for receiving the context response of the described protocol context request of response, and described context response comprises the information of available data channel;

Packet sending unit is used for sending datagram by described available data channel.

The embodiment of the invention also provides a kind of data message transmitting system, comprising:

The first mobile management node is used for sending the disabled information of data channel when judging that data channel is unavailable;

The second mobile management node is used for receiving the disabled information of data channel that described the first mobile management node sends, and structure also sends the unavailable indication of data channel, and the unavailable indication of described data channel comprises the disabled information of described data channel;

The data message dispensing device is used for the unavailable indication of receive data passage; After receiving the unavailable indication of described data channel, send protocol context request; Receive the context response of the described protocol context request of response, described context response comprises the information of available data channel; Send datagram by described available data channel;

The data message receiving system is used for receiving described protocol context request; Send described context response; Receive described data message.

Serving general radio packet service support node is used for sending the disabled information of data channel when judging that data channel is unavailable;

The mobile management node, be used for receiving the disabled information of data channel that described serving general radio packet service support node sends, structure also sends the unavailable indication of data channel, and the unavailable indication of described data channel comprises the disabled information of described data channel;

The mobile management node is used for when judging that data channel is unavailable, and structure also sends the unavailable indication of data channel, and the unavailable indication of described data channel comprises the disabled information of described data channel;

Can find out from the above technical scheme that the embodiment of the invention provides, because the embodiment of the invention is unavailable in data channel, when the context of namely preserving is unavailable, can send protocol context request and obtain the information of available data channel, and then can send datagram by available data channel, thereby can prevent that the upstream data mistake from sending, guarantee transmission uplink data messages correct when the context of preserving is unavailable.

Description of drawings

Fig. 1 is the flow chart of data message sending method embodiment one in the embodiment of the invention;

Fig. 2 is the signaling process figure of data message sending method embodiment two in the embodiment of the invention;

Fig. 3 is the signaling process figure of data message sending method embodiment three in the embodiment of the invention;

Fig. 4 is the signaling process figure of data message sending method embodiment four in the embodiment of the invention;

Fig. 5 is the signaling process figure of data message sending method embodiment five in the embodiment of the invention;

Fig. 6 is the signaling process figure of data message sending method embodiment six in the embodiment of the invention;

Fig. 7 is the structure chart of data message dispensing device embodiment one in the embodiment of the invention;

Fig. 8 is the structure chart of data message dispensing device embodiment two in the embodiment of the invention;

Fig. 9 is the structure chart of data message transmitting system embodiment one in the embodiment of the invention;

Figure 10 is the structure chart of data message transmitting system embodiment two in the embodiment of the invention;

Figure 11 is the structure chart of data message transmitting system embodiment three in the embodiment of the invention.

Embodiment

For make purpose of the present invention, technical scheme, and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.

Introduce first the data message sending method that the embodiment of the invention provides, be applied to user terminal in internetwork switching, Fig. 1 has described the flow process of data message sending method embodiment one, comprising:

Step 101, when data channel is unavailable, send protocol context request;

Data transmitting node can know that data channel is unavailable by the information that other nodes send, such as sent by MME etc.; Also can self data detection channel whether available, can send the information of replying of requiring by data channel, if obtain replying then illustrate that data channel can use, otherwise illustrate that then data channel is unavailable;

In the embodiment of the invention, data transmitting node can the unavailable indication of receive data passage to obtain data channel unavailable, wherein the disabled information of data channel that comprises of the unavailable indication of data channel can make data transmitting node know that data channel is unavailable; The unavailable corresponding context of namely preserving of data channel is disabled; This indication specifically can be sent by target MME, and this target MME is the MME in the network that switches to of user terminal.Target MME can send the unavailable indication of data channel when self judges that data channel is unavailable; Also can be after target MME receives the disabled information of data channel from source MME or source serving general radio packet service support node (SGSN:Serving GPRS Support Node), to send the unavailable indication of data channel; Wherein, source MME is that user terminal switches the MME in the front network, and source SGSN is that user terminal switches the SGSN in the front network.Data transmitting node can be target SGW in the embodiment of the invention.Wherein, the data channel in the embodiment of the invention can be the upstream data passage, and corresponding data channel is unavailable to be designated as the unavailable indication of upstream data passage.

Particularly, source MME or source SGSN or target MME can be according to source VPLMN network design IWP, and current the generation switched between PLMN, judge the upstream data passage unavailable, perhaps according to the mobile subscriber switching between PMIP agreement and the GTP agreement having occured, has judged the upstream data passage unavailable; Wherein, how to confirm upstream data passage is unavailable can to preset corresponding scene, can assert that when corresponding scene occurs the upstream data passage is unavailable.

Wherein, the unavailable indication of data channel can be the indication of a demonstration, for example newly increases a message as the unavailable indication of data channel, or increases the unavailable indication of a parameter transmission data channel in existing information; The unavailable indication of data channel also can be the indication of an implicit expression, for example GREKey or TEID can be made as invalid value 0, perhaps binary representation is complete 1, and expression upstream data passage is unavailable, does not perhaps carry TEID or GRE Key and represents that the upstream data passage is unavailable.

Data transmitting node is when data channel is unavailable, and the protocol context request of transmission can be a message that newly increases, and also can be existing message, and embodiment of the invention preferred protocol context request is existing message; Different according to the agreement of using, protocol context request can have difference, for example can be bearer update request or the load creating request in the GTP agreement, the perhaps agent binding update in the PMIP agreement (PBU:Proxy Binding Update) request etc.

The context response of step 102, reception response protocol context request, this context response comprises the information of available data channel;

The context response that data transmitting node receives can be sent by data reception node, the information of the available data channel in the context response specifically can be context, as being the TEID under the GTP agreement, the perhaps GRE Key under the PMIP agreement.Wherein, the context response is corresponding with protocol context request, can be bearer update response or load creating response in the GTP agreement, or the agent binding in the PMIP agreement is confirmed (PBA:Proxy Binding Acknowledge) message etc.; Wherein, data reception node can be PGW, new IWP etc.

Step 103, send datagram by available data channel.

After data transmitting node receives the context response, can determine available data channel according to the information of available data channel, and then by available data channel data message being sent to data reception node, data message is the data message of the access network that receives of data transmitting node.

From the above, the present embodiment is unavailable in data channel, when the context of namely preserving is unavailable, can send protocol context request and obtain the information of available data channel, and then can send datagram by available data channel, thereby can prevent that the upstream data mistake from sending, guarantee transmission uplink data messages correct when the context of preserving is unavailable.

Further, for system resource can be utilized effectively, can close data message before sending protocol context request and send, the needed resource thereby the minimizing data sending device sends datagram also can avoid data message to send to wrong data reception node simultaneously.

If closed the data message transmission, after having received the context response, can send by the turn-on data message, thereby data transmitting node can be sent datagram by available data channel, guarantee the true(-)running of system.

Further, for the data message that data reception node is received correct as far as possible, when having closed the data message transmission, the data message that can buffer memory receives, thereby after having opened data message and sending, can the packet literary composition of buffer memory be sent to data reception node by available data channel.

The embodiment of the invention also provides data message sending method embodiment two, described in the EPC network, when user terminal switches between GTP network and GTP network, because variation has occured in IWP, handling process when the context that causes MME to transmit is incorrect, its concrete signaling process comprises as shown in Figure 2:

Step 201, source evolution base station (eNodeB) judge that UE need to initiate to switch, send switching to source MME and need request (Handover Required) message, request switches to target visit GTP network from the GTP network of the current ownership of UE, the switching here also can be to switch to home network from visited network, perhaps switch to another visited network from a visited network, subsequent embodiment is similar; Step 202, source MME send to target MME and transmit position updating request (Forward Relocation Request) message, carry the context information that MME preserves in the described forwarding location update request message, the user's face address that comprises PGW, the TEID of PGW, and the SGW user's face address that is used for the downlink data transmission of source SGW distribution, descending TEID;

Source MME can judge whether the upstream data passage available before sending above-mentioned forwarding location update request message, if source MME judgement source VPLMN network design IWP, and current the generation switch between PLMN, can think that then the upstream data passage is unavailable; Source MME also can judge that the upstream data passage is unavailable according to other reason, and board switchover occured MME such as the source, and the TEID of the PGW of preservation is the CRC check failure behind board switchover, can think that also the upstream data passage is unavailable;

When source MME judges that the upstream data passage is unavailable, source MME can carry the unavailable indication of upstream data passage in above-mentioned forwarding location update request message, the unavailable indication of upstream data passage can be an explicit indication, can in transmitting location update request message, expand a specific parameter, such as up carrying available (UL_Bearer_Valid) parameter, transmit the unavailable indication of upstream data passage with this parameter, this value is that 1 expression upstream data passage can directly use, and this value is that 0 expression upstream data passage is unavailable; The unavailable indication of upstream data passage also can be the indication of an implicit expression, and as TEID being made as invalid value 0, perhaps binary representation is complete 1, and expression upstream data passage is unavailable etc.; The embodiment of the invention does not limit the concrete manifestation form of the unavailable indication of upstream data passage;

Step 203, target MME send to target SGW and create carrying request (Create BearerRequest) message, carry the context information that receives from source MME in the described establishment bearing request message, comprise user's face address of PGW, the TEID of PGW; And the SGW user's face address that is used for the downlink data transmission of source SGW distribution, descending TEID, Handover indication;

If source MME does not send the unavailable indication of upstream data passage, target MME can judge whether the upstream data passage is available before sending above-mentioned establishment bearing request message, if target VPLMN network design IWP, and current the generation switched between PLMN, can think that then the upstream data passage is unavailable, perhaps from the forwarding location update request message that source MME receives, comprised the unavailable indication of upstream data passage, thought that then the upstream data passage is unavailable;

When target MME judges that the upstream data passage is unavailable, target MME can carry the unavailable indication of upstream data passage in above-mentioned establishment bearing request message, it can be an explicit indication, such as specific parameter of expansion in creating bearing request message, such as up carrying available parameter, transmit the unavailable indication of upstream data passage, this value is that 1 expression upstream data passage can directly use, and this value is that 0 expression upstream data passage is unavailable; The unavailable indication of upstream data passage also can be the indication of an implicit expression, and as by TEID being made as invalid value 0, perhaps binary representation is complete 1, and expression upstream data passage is unavailable;

Step 204, target SGW close upstream data and send, and at this moment, because UE does not also switch, target SGW can't receive the uplink data messages from UE;

Step 205, target SGW send to PGW and create bearing request message; In the present embodiment, owing to carrying beyond the Handover indication from the establishment bearing request message of MME, also carried the unavailable indication of upstream data passage, shown that the upstream data passage does not have foundation and finishes, target SGW will send to PGW and create bearing request message;

Target SGW can comprise following information in creating bearing request message:

The SGW user's face address that is used for the downlink data transmission that the source SGW that receives in the step 203 distributes, descending TEID is used for downlink data and sends;

Wherein, user's identification information can be IMSI International Mobile Subscriber Identity (IMSI InternationalMobile Subscriber Identifier) or IMSI and Network Service Access point sign) (NSAPI:Network Service Access Point Identifier or IMSI and APN (APN:AccessPoint Name), above-mentioned information can obtain in the establishment bearing request message that MME sends from step 203;

Create the carrying request and can further include the information that sends for upstream data in the context that obtains in the step 203, comprise user's face address of PGW, the TEID of PGW;

Owing to having introduced IWP and having realized internetwork intercommunication, above-mentioned establishment carrying request has been forwarded to IWP by IP network, IWP transmits and creates bearing request message to PGW, if adopted other agreement beyond the GTP between IWP and the PGW, IWP will carry out corresponding protocol conversion.

PGW responds the establishment carrying request of above-mentioned IWP forwarding or the message after other protocol conversion, and IWP will receive the response message from PGW;

Step 206, IWP distribute PGW user's face address of GTP carrying between target SGW and the PGW, and the TEID of upstream data transmission, IWP sends and creates carrying response (Create BearerResponse) message to target SGW, carry PGW user's face address of GTP carrying between above-mentioned target SGW and the PGW in the described establishment bearing response message, and the TEID of upstream data transmission;

Step 207, target SGW have obtained PGW user's face address of GTP carrying between target SGW that IWP distributes and the PGW from step 206, and the TEID that sends of upstream data, and can send uplink message this moment, so target SGW opens uplink message and sends.

So far can guarantee that data message can be sent to data reception node by available upstream data passage; Following step guarantees that further data message can transmit by corresponding downlink data channel;

Step 208, target SGW distribute SGW user's face address and the TEID that the S1 carrying sends for upstream data between evolution base station and the target SGW, and send to create bearing response message to target MME, carry target SGW in the described establishment bearing response message and distribute that the S1 carrying is used for SGW user's face address and the TEID that upstream data sends between evolution base station and the target SGW;

Step 209, target MME send handover request (Handover Request) message to target evolution base station, carry in the described handover request message in the step 208 that the S1 carrying is used for SGW user's face address and the TEID that upstream data sends between the evolution base station that receives from target SGW and the target SGW;

The S1 carrying is used for downlink data transmission TEID (the descending TEID of S1) between step 210, target evolution base station distribution evolution base station and the target SGW, target evolution base station sends Handover Request Acknowledge (Handover Request Ack) message to target MME, carries the descending TEID information of above-mentioned S1 in the described switching request acknowledgement message.

Step 211, target MME send to target SGW and create the carrying request, are used for setting up the GTP carrying of converting downlink data message between source SGW and the target SGW;

Step 212, target SGW send to target MME and create the carrying response, are used for setting up the GTP carrying of converting downlink data message between source SGW and the target SGW;

Step 213, target MME send to source MME and transmit position renewal response (ForwardRelocation Response) message, described forwarding position is upgraded in the response message and is carried step 211, the GTP beared information that is used for converting downlink data message between source SGW and the target SGW that target SGW distributes in 212;

Step 214, source MME send to source SGW and create bearing request message, are used for setting up the GTP carrying of converting downlink data message between source SGW and the target SGW;

Step 215, source SGW send to source MME and create bearing response message, are used for setting up the GTP carrying of converting downlink data message between source SGW and the target SGW;

Step 216, source MME send switching command (Handover Command) message to the source evolution base station;

Step 217, source evolution base station send switching command message to user terminal UE;

Step 218, UE initiate to switch, and separate from source evolution base station Source eNodeB, and are attached on the target evolution base station Target eNodeB;

Step 219, UE send to switch and confirm that (Handover Confirm) message is to target evolution base station;

At this moment, target evolution base station can the converting downlink message to UE;

Uplink data messages for UE sends by target evolution base station, sends to target SGW; Because in the step 206, target SGW has obtained correct context from IWP, in the step 207, target SGW has opened the uplink message transmission, and therefore, target SGW will transmit above-mentioned uplink message to IWP, and IWP will transmit above-mentioned uplink data messages to PGW;

Step 220, target evolution base station send switching notice (Handover Notify) message to target MME;

Step 221, target MME send the renewal of forwarding position and finish (Forward RelocationComplete) message to source MME;

Step 222, source MME send the renewal of forwarding position and finish affirmation (Forward RelocationComplete Ack) message to target MME;

Step 223, target MME send and upgrade bearing request message (Update Bearer Request) to target SGW, carry the descending TEID information of S1 that target evolution base station distributes in the step 210 in the described renewal bearing request message;

Step 224, target SGW distribute SGW user's face address of GTP carrying between target SGW and the PGW, and the TEID of downlink data transmission, target SGW sends to PGW and upgrades bearing request message, carry SGW user's face address of GTP carrying between above-mentioned target SGW and the PGW in the described renewal bearing request message, and the TEID of downlink data transmission;

Owing to having introduced IWP and having realized internetwork intercommunication, above-mentioned more new bearer request has been forwarded to IWP by IP network, IWP transmits and upgrades bearing request message to PGW, if adopted other agreement beyond the GTP between IWP and the PGW, IWP will carry out corresponding protocol conversion.

PGW responds the more new bearer request of above-mentioned IWP forwarding or the message after other protocol conversion, and IWP will receive the response message from PGW; Step 225, IWP send and upgrade bearing response message (UpdateBearer Response) to target SGW;

Step 226, target SGW send and upgrade bearing response message to target MME;

From the above, MME judges when the upstream data passage is unavailable in the present embodiment, transmit the unavailable target SGW that is indicated to of upstream data passage, after target SGW obtains above-mentioned indication, after obtaining real context from PGW, just opening the upstream data transmission by sending the establishment bearing request message, can prevent that the upstream data mistake from sending, guarantee transmission uplink data messages correct when the context of preserving is unavailable.

The embodiment of the invention also provides data message sending method embodiment three, described in the EPC network, when user terminal switches between GTP network and GTP network, because variation has occured in IWP, handling process when the context that causes MME to transmit is incorrect, its concrete signaling process comprises as shown in Figure 3:

Before switching, no matter be downlink data message or downlink data message, all be by the source evolution base station, source SGW, the PGW sending and receiving;

Step 301, source evolution base station judge that UE need to initiate to switch, and sending to switch to source MME needs request message, and request switches to target visit GTP network from the GTP network of the current ownership of UE;

Step 302, source MME send to target MME and transmit location update request message, carry the context information that MME preserves in the described forwarding location update request message, comprise user's face address of PGW, the TEID of PGW;

When source MME judges that the upstream data passage is unavailable, source MME can carry the unavailable indication of upstream data passage in above-mentioned forwarding location update request message, the unavailable indication of upstream data passage can be an explicit indication, can in transmitting location update request message, expand a specific parameter, such as up carrying available parameter, transmit the unavailable indication of upstream data passage with this parameter, this value is that 1 expression upstream data passage can directly use, and this value is that 0 expression upstream data passage is unavailable; The unavailable indication of upstream data passage also can be the indication of an implicit expression, and as TEID being made as invalid value 0, perhaps binary representation is complete 1, and expression upstream data passage is unavailable etc.; The embodiment of the invention does not limit the concrete manifestation form of the unavailable indication of upstream data passage;

Step 303, target MME send to target SGW and create bearing request message, carry the context information that receives from source MME in the described establishment bearing request message, comprise user's face address of PGW, the TEID of PGW;

When target MME judges that the upstream data passage is unavailable, target MME can carry the unavailable indication of upstream data passage in above-mentioned establishment bearing request message, the unavailable indication of upstream data passage can be an explicit indication, such as specific parameter of expansion in creating bearing request message, such as up carrying available parameter, transmit the unavailable indication of upstream data passage, this value is that 1 expression upstream data passage can directly use, and this value is that 0 expression upstream data passage is unavailable; The unavailable indication of upstream data passage also can be the indication of an implicit expression, and as by TEID being made as invalid value 0, perhaps binary representation is complete 1, and expression upstream data passage is unavailable;

Step 304, target SGW distribute SGW user's face address and the TEID that the S1 carrying sends for upstream data between evolution base station and the target SGW, and send to create bearing response message to target MME, carry target SGW in the described establishment bearing response message and distribute that the S1 carrying is used for SGW user's face address and the TEID that upstream data sends between evolution base station and the target SGW;

Step 305, target MME send handover request message to target evolution base station, carry in the described handover request message in the previous step that the S1 carrying is used for SGW user's face address and the TEID that upstream data sends between the evolution base station that receives from target SGW and the target SGW;

The S1 carrying is used for downlink data transmission TEID (the descending TEID of S1) between step 306, target evolution base station distribution evolution base station and the target SGW, target evolution base station sends switching request acknowledgement message to target MME, carries the descending TEID information of above-mentioned S1 in the described switching request acknowledgement message.

Step 307, target MME send to target SGW and create the carrying request, are used for setting up the GTP carrying of converting downlink data message between source SGW and the target SGW;

Step 308, target SGW send to target MME and create the carrying response, are used for setting up the GTP carrying of converting downlink data message between source SGW and the target SGW;

Step 309, target MME send to source MME and transmit the position and upgrade response message, and described forwarding position is upgraded in the response message and carried step 307, the GTP beared information that is used for converting downlink data message between source SGW and the target SGW that target SGW distributes in 308;

Step 310, source MME send to source SGW and create bearing request message, are used for setting up the GTP carrying of converting downlink data message between source SGW and the target SGW;

Step 311, source SGW send to source MME and create bearing response message, are used for setting up the GTP carrying of converting downlink data message between source SGW and the target SGW;

Step 312, source MME send switching command message to the source evolution base station;

Step 313, source evolution base station send switching command message to user terminal UE;

For the uplink data messages that UE sends, still by the source evolution base station, source SGW sends to source PGW;

For the downlink data message that sends to UE, PGW sends to the source evolution base station, and the source evolution base station is forwarded to target evolution base station, the above-mentioned downlink data message of target evolution base station buffer memory;

Step 314, UE initiate to switch, and separate from source evolution base station Source eNodeB, and are attached on the target evolution base station Target eNodeB;

Step 315, UE send switch acknowledgment message to target evolution base station;

At this moment, target evolution base station can the converting downlink message to user terminal UE;

Uplink data messages for UE sends by target evolution base station, sends to target SGW;

Step 316, target SGW close upstream data and send, the uplink data messages that buffer memory receives;

Because in the step 303, target SGW has received the unavailable indication of upstream data passage from target MME, be user's face address of the included PGW of the context information received of target SGW, the TEID of PGW, may be incorrect, therefore, target SGW does not send to PGW with above-mentioned uplink data messages;

Target SGW can abandon, perhaps the uplink data messages received of buffer memory;

Step 317, target evolution base station send handoff notification message to target MME;

Step 318, target MME send the renewal of forwarding position and finish message to source MME;

Step 319, source MME send the renewal of forwarding position and finish acknowledge message to target MME;

Step 320, target MME send and upgrade bearing request message to target SGW, carry the descending TEID information of S1 that target evolution base station distributes in the step 306 in the described renewal bearing request message;

Step 321, target SGW distribute SGW user's face address of GTP carrying between target SGW and the PGW, and the TEID of downlink data transmission, target SGW sends to PGW and upgrades bearing request message, carry SGW user's face address of GTP carrying between above-mentioned target SGW and the PGW in the described renewal bearing request message, and the TEID of downlink data transmission.

Because in the step 303, target SGW has received the unavailable indication of upstream data passage from target MME, be user's face address of the included PGW of context information that receives of target SGW, the TEID of PGW, may be incorrect, therefore, target SGW send to the form of the renewal bearing request message of PGW can be as follows:

The destination address of IP layer is the PGW address, and this address can pass to target SGW by MME in step 303;

TEID in the GTP protocol header extends this as 0, and TEID is uncertain for the expression purpose;

Upgrade bearing request message and comprise that target SGW distributes SGW user's face address of GTP carrying between target SGW and the PGW, and the TEID of downlink data transmission;

Further more new bearer request also comprises user's identification information, such as IMSI+NSAPI, and IMSI+APN, above-mentioned information can be in step 303, obtains in the establishment bearing request message that MME sends;

Upgrade bearing request message and can further include the context information that obtains in the step 303, comprise user's face address of PGW, the TEID of PGW.

Target SGW also can send and create bearing request message Create Bearer Reuqest to PGW, creates to comprise following information in the carrying request:

Target SGW distributes SGW user's face address of GTP carrying between target SGW and the PGW, and the TEID of downlink data transmission;

User's identification information, such as IMSI+NSAPI, IMSI+APN, above-mentioned information can be in step 303, obtains in the establishment bearing request message that MME sends;

Create the carrying request and can further include the context information that obtains in the step 303, comprise user's face address of PGW, the TEID of PGW.

Owing to having introduced IWP and having realized internetwork intercommunication, above-mentioned more new bearer request or establishment carrying request have been forwarded to IWP by IP network, IWP transmits more new bearer request or creates bearing request message to PGW, if adopted other agreement beyond the GTP between IWP and the PGW, IWP will carry out corresponding protocol conversion.

PGW responds the more new bearer request that above-mentioned IWP transmits, and perhaps creates the carrying request, the perhaps message after other protocol conversion, and IWP will receive the response message from PGW; Step 322, IWP distribute PGW user's face address of GTP carrying between target SGW and the PGW, and the TEID of upstream data transmission, IWP sends and upgrades bearing response message to target SGW, carry PGW user's face address of GTP carrying between above-mentioned target SGW and the PGW in the described renewal bearing response message, and the TEID of upstream data transmission.

If target SGW sends establishment carrying request to IWP, IWP sends establishment carrying response to target SGW, carries PGW user's face address of GTP carrying between above-mentioned target SGW and the PGW in the described establishment bearing response message, and the TEID of upstream data transmission.

Step 323, target SGW send and upgrade bearing response message to target MME;

Step 324, target SGW have obtained PGW user's face address of GTP carrying between target SGW that IWP distributes and the PGW from step 322, and the TEID of upstream data transmission, can send uplink message, therefore target SGW opens the uplink message transmission, PGW user's face address according to GTP carrying between the target SGW that receives and the PGW, and the TEID of upstream data transmission, the uplink data messages that forwarding is received from UE is to IWP, and the uplink data messages that sends buffer memory is to IWP, and IWP will transmit above-mentioned uplink data messages and arrive PGW;

Wherein, step 323 and step 324 do not have the sequencing relation;

From the above, MME judges when the upstream data passage is unavailable in the present embodiment, transmit the unavailable target SGW that is indicated to of upstream data passage, target SGW closes the upstream data transmission after receiving above-mentioned indication, the upstream data that buffer memory receives, target SGW are opened the upstream data that upstream data sent and sent buffer memory after obtaining real context from PGW, thereby can prevent that the upstream data mistake from sending, guarantee transmission uplink data messages correct when the context of preserving is unavailable.

The embodiment of the invention also provides data message sending method embodiment four, described in the EPC network, when user terminal switches between PMIP network and PMIP network, because variation has occured in IWP, handling process when the context that causes MME to transmit is incorrect, its concrete signaling process comprises as shown in Figure 4:

Step 401, source evolution base station judge that UE need to initiate to switch, and sending to switch to source MME needs request message, and request switches to target visit PMIP network from the PMIP network of the current ownership of UE;

Step 402, source MME send to target MME and transmit location update request message, carry the context information that MME preserves in the described forwarding location update request message, the LMA address that comprises the PGW that sends for upstream data, the GRE Key in tunnel between the PGW that PGW distributes and the source SGW, and the MAG address that is used for the source SGW of downlink data transmission, the GRE Key in tunnel between the PGW that source SGW distributes and the source SGW;

Source MME can judge whether the upstream data passage is available before sending above-mentioned forwarding location update request message, if source VPLMN network design IWP, and current the generation switched between PLMN, can think that then the upstream data passage is unavailable, perhaps board switchover occured in source MME, the GRE Key that the PGW that preserves distributes is the CRC check failure behind board switchover, thinks that also the upstream data passage is unavailable;

When source MME judges that the upstream data passage is unavailable, source MME can carry the unavailable indication of upstream data passage in above-mentioned forwarding location update request message, the unavailable indication of upstream data passage can be an explicit indication, such as specific parameter of expansion in transmitting location update request message, such as up carrying available parameter, transmit the unavailable indication of upstream data passage, this value is that 1 expression upstream data passage can directly use, and this value is that 0 expression upstream data passage is unavailable; The unavailable indication of upstream data passage also can be the indication of an implicit expression, and as by GRE Key is made as invalid value 0, perhaps binary representation is complete 1, and expression upstream data passage is unavailable;

Step 403, target MME send to target SGW and create bearing request message, carry the context information that receives from source MME in the described establishment bearing request message, the LMA address that comprises the PGW that sends for upstream data, the GRE Key in tunnel between the PGW that PGW distributes and the source SGW, and the MAG address that is used for the source SGW of downlink data transmission, the GRE Key in tunnel between the PGW that source SGW distributes and the source SGW, the Handover indication;

When target MME judges that the upstream data passage is unavailable, target MME can carry the unavailable indication of upstream data passage in above-mentioned establishment bearing request message, the unavailable indication of upstream data passage can be an explicit indication, such as specific parameter of expansion in creating bearing request message, such as up carrying available parameter, transmit the unavailable indication of upstream data passage, this value is that 1 expression upstream data passage can directly use, and this value is that 0 expression upstream data passage is unavailable; The unavailable indication of upstream data passage also can be the indication of an implicit expression, and as by GRE Key is made as invalid value 0, perhaps binary representation is complete 1, and expression upstream data passage is unavailable;

Step 404, target SGW close upstream data and send, and at this moment, because UE does not also switch, target SGW can't receive the uplink data messages from UE;

Step 405, target SGW send agent binding update (Proxy Binding Update) message to PGW;

Owing to carrying beyond the Handover indication, also having carried the unavailable indication of upstream data passage from the establishment bearing request message of MME, illustrate the upstream data passage not foundation finish, so target SGW will send agent binding update messages to PGW;

Target SGW can comprise following information in agent binding update messages:

The MAG address of the SGW that is used for the downlink data transmission that the source SGW that receives from step 403 distributes, descending GRE Key is used for downlink data and sends;

User's identification information, such as IMSI+NSAPI, IMSI+APN, above-mentioned information can be in step 403, obtains in the establishment bearing request message that MME sends.

Further, agent binding update can also comprise in the step 403 the GRE Key in tunnel between PGW that the PGW that obtains distributes and the source SGW.

Owing to having introduced IWP and having realized internetwork intercommunication, above-mentioned agent binding update messages has been forwarded to IWP by IP network, IWP Forward Proxy binding update messages is to PGW, if adopted PMIP other agreement in addition between IWP and the PGW, IWP will carry out corresponding protocol conversion.

PGW responds the agent binding update messages of above-mentioned IWP forwarding or the message after other protocol conversion, and IWP will receive the response message from PGW;

Step 406, IWP distribute the GRE Key in tunnel between target SGW and the PGW, IWP sends agent binding affirmation (Proxy Binding Ack) message and carries the GRE Key in tunnel between above-mentioned target SGW and the PGW in the described proxy binding acknowledgment messages to target SGW;

Step 407, target SGW have obtained the GRE Key in tunnel between target SGW that IWP distributes and the PGW from step 406, can send uplink message this moment, so target SGW opens uplink message and sends;

Step 408, target SGW distribute SGW user's face address and the TEID that the S1 carrying sends for upstream data between evolution base station and the target SGW, and send to create bearing response message to target MME, carry target SGW in the described establishment bearing response message and distribute that the S1 carrying is used for SGW user's face address and the TEID that upstream data sends between evolution base station and the target SGW;

Step 409, target MME send handover request message to target evolution base station, carry in the described handover request message in the previous step that the S1 carrying is used for SGW user's face address and the TEID that upstream data sends between the evolution base station that receives from target SGW and the target SGW;

The S1 carrying is used for downlink data transmission TEID (the descending TEID of S1) between step 410, target evolution base station distribution evolution base station and the target SGW, target evolution base station sends switching request acknowledgement message to target MME, carries the descending TEID information of above-mentioned S1 in the described switching request acknowledgement message.

Step 411, target MME send to target SGW and create the carrying request, are used for setting up the GTP carrying of converting downlink data message between source SGW and the target SGW;

Step 412, target SGW send to target MME and create the carrying response, are used for setting up the GTP carrying of converting downlink data message between source SGW and the target SGW;

Step 413, target MME send to source MME and transmit the position and upgrade response message, and described forwarding position is upgraded in the response message and carried step 411, the GTP beared information that is used for converting downlink data message between source SGW and the target SGW that target SGW distributes in 412;

Step 414, source MME send to source SGW and create the carrying request, are used for setting up the GTP carrying of converting downlink data message between source SGW and the target SGW;

Step 415, source SGW send to source MME and create the carrying response, are used for setting up the GTP carrying of converting downlink data message between source SGW and the target SGW;

Step 416, source MME send switching command message to the source evolution base station;

Step 417, source evolution base station send switching command message to user terminal UE;

Step 418, UE initiate to switch, and separate from source evolution base station Source eNodeB, and are attached on the target evolution base station Target eNodeB; Step 419, UE send switch acknowledgment message to target evolution base station;

Uplink data messages for UE sends by target evolution base station, sends to target SGW; Because in the step 406, target SGW has obtained correct context from IWP, in the step 407, target SGW has opened the uplink message transmission, and therefore, target SGW will transmit above-mentioned uplink message to IWP, and IWP will transmit above-mentioned uplink data messages to PGW;

Step 420, target evolution base station send handoff notification message to target MME;

Step 421, target MME send the renewal of forwarding position and finish message to source MME;

Step 422, source MME send the renewal of forwarding position and finish acknowledge message to target MME;

Step 423, target MME send more new bearer request to target SGW, carry the descending TEID information of S1 that target evolution base station distributes in the step 410 in the described renewal bearing request message;

Step 424, target SGW distribute the GRE Key in tunnel between target SGW and the PGW, and target SGW sends the GRE Key that carries tunnel between above-mentioned target SGW and the PGW in the described agent binding update messages of agent binding update messages to PGW;

Step 425, IWP send agent binding message authentication message to target SGW;

Step 426, target SGW send and upgrade bearing response message to target MME;

Wherein, the present embodiment is in step 405, can not send PBU message to PGW in 406 to obtain context information, but in step 424, sends PBU messaging protocol contextual information to PGW in 425.Therefore, target SGW need to just open upstream data and send the uplink data messages that this moment, target SGW needed buffer memory to receive after step 425 receives the PBA response.

From the above, MME judges when the upstream data passage is unavailable in the present embodiment, transmit the unavailable target SGW that is indicated to of upstream data passage, target SGW closes the upstream data transmission after receiving above-mentioned indication, and after obtaining real context from PGW, opening upstream data and sending by sending agent binding update messages, thereby can prevent that the upstream data mistake from sending, guarantee transmission uplink data messages correct when the context of preserving is unavailable.

The embodiment of the invention also provides data message sending method embodiment five, described in the EPC network, when user terminal switches to the PMIP network from the GTP network, because the agreement that the S8 interface uses changes, handling process when the context that causes MME to transmit is incorrect, in the present embodiment, can pass through IWP between target SGW and the PGW, also can be without IWP; The concrete signaling process of the present embodiment comprises as shown in Figure 5:

Step 501, source evolution base station judge that UE need to initiate to switch, and sending to switch to source MME needs request message, and request switches to target visit PMIP network from the GTP network of the current ownership of UE;

Step 502, source MME send to target MME and transmit location update request message, carry the context information that MME preserves in the described forwarding location update request message, the context information that described MME preserves comprises user's face address of PGW, the TEID of PGW;

Source MME can judge whether the upstream data passage is available before sending above-mentioned forwarding location update request message, if terminal switches to the PMIP network from the GTP network, can think that then the upstream data passage is unavailable;

When source MME judges that the upstream data passage is unavailable, source MME can carry the unavailable indication of upstream data passage in above-mentioned forwarding location update request message, the unavailable indication of upstream data passage can be an explicit indication, such as specific parameter of expansion in transmitting location update request message, such as up carrying available parameter, transmit the unavailable indication of upstream data passage, this value is that 1 expression upstream data passage can directly use, and this value is that 0 expression upstream data passage is unavailable; The unavailable indication of upstream data passage also can be the indication of an implicit expression, and as by TEID being made as invalid value 0, perhaps binary representation is complete 1, and expression upstream data passage is unavailable;

Step 503, target MME send to target SGW and create bearing request message, carry the context information that receives from source MME in the described establishment bearing request message, comprise the PGW user's face address that sends for upstream data, the TEID of GTP tunnel between the PGW that PGW distributes and the source SGW, and the user's face address that is used for the source SGW of downlink data transmission, the TEID of GTP tunnel between the PGW that source SGW distributes and the source SGW, the Handover indication;

If source MME does not send the unavailable indication of upstream data passage, target MME can judge whether the upstream data passage is available before sending above-mentioned establishment bearing request message, if terminal switches to the PMIP network from the GTP network, can think that then the upstream data passage is unavailable, perhaps from the forwarding location update request message that source MME receives, comprised the unavailable indication of upstream data passage, thought that then the upstream data passage is unavailable;

When target MME judges that the upstream data passage is unavailable, target MME can carry the unavailable indication of upstream data passage in above-mentioned establishment bearing request message, the unavailable indication of upstream data passage can be an explicit indication, such as specific parameter of expansion in creating bearing request message, such as up carrying available parameter, transmit the unavailable indication of upstream data passage, this value is that 1 expression upstream data passage can directly use, and this value is that 0 expression upstream data passage is unavailable; The unavailable indication of upstream data passage also can be the indication of an implicit expression, as by TEID is made as invalid value, and full 0 or binary representation complete 1, expression upstream data passage is unavailable;

Step 504, target SGW close upstream data and send, and at this moment, because UE does not also switch, target SGW can't receive the uplink data messages from UE;

Step 505, target SGW send agent binding update messages to PGW;

Owing to except carrying the Handover indication, also having carried the unavailable indication of upstream data passage from the establishment bearing request message of MME, illustrate the upstream data passage not foundation finish, so target SGW will send agent binding update messages to PGW; Wherein, target SGW can directly send agent binding update messages to PGW, also can send agent binding update messages to PGW by target IWP;

Target SGW can comprise following information in agent binding update messages:

The SGW user's face address that is used for the downlink data transmission that target SGW distributes, descending TEID is used for downlink data and sends;

User's identification information, such as IMSI+NSAPI, IMSI+APN, above-mentioned information can be in step 503, obtains in the establishment bearing request message that MME sends.

Because this moment, used identical user totem information to set up GTP tunnel between PGW and the source SGW, target SGW need to carry an indication in this PBU message, being used to indicate the PGW downlink data does not switch, in order in PBU message, to carry above-mentioned indication, can expand a connection status (Connection_Status) option (Option) in the PMIP agreement, if this Option value is 0 (Inactive), expression is not initiated to switch; PBU message also can be reused existing indication, and such as the Handover indication, when comprising the Handover indication in the PBU message, PGW does not switch to downlink data.

Step 506, PGW distribute the GRE Key in tunnel between target SGW and the PGW, and PGW sends proxy binding acknowledgment messages to target SGW, carries the GRE Key in tunnel between above-mentioned target SGW and the PGW in the described proxy binding acknowledgment messages;

Because target SGW carried the Handover indication in PBU message, therefore for downlink data, PGW will preferentially send to and source SGW between GTP tunnel, after the GTP tunnel between PGW and the source SGW is deleted, just send to target SGW; Wherein, PGW can directly send proxy binding acknowledgment messages to target SGW, also can send proxy binding acknowledgment messages to target SGW by target IWP;

Step 507, target SGW have obtained the GRE Key in tunnel between target SGW that PGW distributes and the PGW from step 506, can send uplink message this moment, so target SGW opens uplink message and sends;

Step 508, target SGW distribute SGW user's face address and the TEID that the S1 carrying sends for upstream data between evolution base station and the target SGW, and send to create bearing response message to target MME, carry target SGW in the described establishment bearing response message and distribute that the S1 carrying is used for SGW user's face address and the TEID that upstream data sends between evolution base station and the target SGW;

Step 509, target MME send handover request message to target evolution base station, carry in the described handover request message in the previous step that the S1 carrying is used for SGW user's face address and the TEID that upstream data sends between the evolution base station that receives from target SGW and the target SGW;

The S1 carrying is used for downlink data transmission TEID (the descending TEID of S1) between step 510, target evolution base station distribution evolution base station and the target SGW, target evolution base station sends switching request acknowledgement message to target MME, carries the descending TEID information of above-mentioned S1 in the described switching request acknowledgement message;

Step 511, target MME send to target SGW and create the carrying request, are used for setting up the GTP carrying of converting downlink data message between source SGW and the target SGW;

Step 512, target SGW send to target MME and create the carrying response, are used for setting up the GTP carrying of converting downlink data message between source SGW and the target SGW;

Step 513, target MME send to source MME and transmit the position and upgrade and finish message, and described forwarding position is upgraded to finish and carried step 511 in the message, the GTP beared information that is used for converting downlink data message between source SGW and the target SGW that target SGW distributes in 512;

Step 514, source MME send to source SGW and create bearing request message, are used for setting up the GTP carrying of converting downlink data message between source SGW and the target SGW;

Step 515, source SGW send to source MME and create bearing response message, are used for setting up the GTP carrying of converting downlink data message between source SGW and the target SGW;

Step 516, source MME send switching command message to the source evolution base station;

Step 517, source evolution base station send switching command message to UE;

Step 518, UE initiate to switch, and separate from source evolution base station Source eNodeB, and are attached on the target evolution base station Target eNodeB;

Step 519, UE send switch acknowledgment message to target evolution base station;

Uplink data messages for UE sends sends to target SGW by target evolution base station; Because in the step 506, target SGW has obtained correct context from PGW, in the step 507, target SGW has opened the uplink message transmission, so target SGW will transmit above-mentioned uplink message to PGW;

Step 520, target evolution base station send handoff notification message to target MME;

Step 521, target MME send the renewal of forwarding position and finish message to source MME, because objective network is not reused the context that source MME sends, therefore, need to carry the deleting bearing indication in the above-mentioned message; When source MME receives above-mentioned deleting bearing indication, need to initiate the operation of carrying before deletion is switched.Target MME also can upgrade in above-mentioned forwarding position to finish and not carry the deleting bearing indication in the message, and source MME judges whether the operation of carrying before needing to initiate deletion switches according to whether having sent the unavailable indication of upstream data passage to target MME;

Step 522, source MME send the renewal of forwarding position and finish acknowledge message to target MME;

Step 523, target MME send and upgrade bearing request message to target SGW, carry the descending TEID information of S1 that target evolution base station distributes in the step 510 in the described renewal bearing request message;

Step 524, target SGW send agent binding update PBU message to PGW, carry an indication in the described PBU message, being used to indicate the PGW downlink data switches, in order in PBU message, to carry above-mentioned indication, method that can similar step 505 is expanded a Connection_Status Option value in the PMIP agreement be 1 (active), and expression is initiated to switch; PBU message also can not carried any indication, uses common PBU message, after PGW receives message, switches downlink data; After PGW receives above-mentioned agent binding update messages, downlink data message can be sent to target SGW.

PGW can further initiate to delete and source SGW between the GTP carrying.

Step 525, PGW send proxy binding acknowledgment messages to target SGW;

Step 526, target SGW send and upgrade bearing response message to target MME;

Wherein, the carrying between PGW and the source SGW also can adopt following mode to delete: source MME sends the deleting bearing request to source SGW, and source SGW sends the deleting bearing request to PGW, PGW delete and source SGW between carrying, and downlink data switched to target SGW;

The embodiment of the invention also provides data message sending method embodiment six, described in the EPC network, when user terminal switches to the GTP network from the PMIP network, because the agreement that the S8 interface uses changes, handling process when the context that causes MME to transmit is incorrect, in the present embodiment, can pass through IWP between target SGW and the PGW, also can be without IWP; The concrete signaling process of the present embodiment comprises as shown in Figure 6:

Step 601, source evolution base station judge that UE need to initiate to switch, and sending to switch to source MME needs request message, and request switches to target visit GTP network from the PMIP network of the current ownership of UE;

Step 602, source MME send to target MME and transmit location update request message, carry the context information that MME preserves in the described forwarding location update request message, the context information that described MME preserves, the LMA address that comprises the PGW that sends for upstream data, the GRE Key in tunnel between the PGW that PGW distributes and the source SGW, and the MAG address that is used for the source SGW of downlink data transmission, the GRE Key in tunnel between the PGW that source SGW distributes and the source SGW;

Source MME can judge whether the upstream data passage is available before sending above-mentioned forwarding location update request message, if terminal switches to the GTP network from the PMIP network, can think that then the upstream data passage is unavailable;

Step 603, target MME send to target SGW and create bearing request message, carry the context information that receives from source MME in the described establishment bearing request message, the LMA address that comprises the PGW that sends for upstream data, the GRE Key in tunnel between the PGW that PGW distributes and the source SGW, and the MAG address that is used for the source SGW of downlink data transmission, the GRE Key in tunnel between the PGW that source SGW distributes and the source SGW, the Handover indication;

If source MME does not send the unavailable indication of upstream data passage, target MME can judge whether the upstream data passage is available before sending above-mentioned establishment bearing request message, if terminal switches to the GTP network from the PMIP network, can think that then the upstream data passage is unavailable, perhaps from the forwarding location update request message that source MME receives, comprised the unavailable indication of upstream data passage, thought that then the upstream data passage is unavailable;

When target MME judges that the upstream data passage is unavailable, target MME can carry the unavailable indication of upstream data passage in above-mentioned establishment bearing request message, the unavailable indication of upstream data passage can be an explicit indication, such as specific parameter of expansion in creating bearing request message, such as up carrying available parameter, transmit the unavailable indication of upstream data passage, this value is that 1 expression upstream data passage can directly use, and this value is that 0 expression upstream data passage is unavailable; The unavailable indication of upstream data passage also can be the indication of an implicit expression, as by GRE Key is made as invalid value, and full 0 or binary representation complete 1, expression upstream data passage is unavailable;

Step 604, target SGW close upstream data and send, and at this moment, because UE does not also switch, target SGW can't receive the uplink data messages from UE;

Step 605, target SGW send to PGW and create bearing request message;

Owing to except carrying the Handover indication, also having carried the unavailable indication of upstream data passage from the establishment bearing request message of MME, illustrate that the upstream data passage is not set up to finish, target SGW will send the establishment bearing request message to PGW; Wherein, target SGW can directly send to PGW and create bearing request message, also can send to PGW by target IWP and create bearing request message;

The SGWMAG address that is used for the downlink data transmission that target SGW distributes, descending GRE Key is used for downlink data and sends;

User's identification information, such as IMSI+NSAPI, IMSI+APN, above-mentioned information can be in step 603, obtains in the establishment bearing request message that MME sends;

Because used identical user totem information to set up PMIP tunnel between PGW and the source SGW this moment, target SGW need to carry an indication in this PBU message, be used to indicate the PGW downlink data and do not switch, and indicates such as Handover;

Step 606, PGW distribute GTP user's face address and TEID between target SGW and the PGW, PGW sends and creates bearing response message to target SGW, carries PGW user's face address and the TEID of GTP tunnel between above-mentioned target SGW and the PGW in the described establishment bearing response message;

Because target SGW has carried the Handover indication in creating bearing request message, therefore for downlink data, PGW will preferentially send to and source SGW between the PMIP tunnel, after the PMIP tunnel between PGW and the source SGW is deleted, just send to target SGW; Wherein, PGW can directly send to target SGW and create bearing response message, also can send to target SGW by target IWP and create bearing response message;

Step 607, target SGW have obtained PGW user's face address and TEID between target SGW that PGW distributes and the PGW from step 606, and can send uplink message this moment, so target SGW opens uplink message and sends;

Step 608, target SGW distribute SGW user's face address and the TEID that the S1 carrying sends for upstream data between evolution base station and the target SGW, and send to create bearing response message to target MME, carry target SGW in the described establishment bearing response message and distribute that the S1 carrying is used for SGW user's face address and the TEID that upstream data sends between evolution base station and the target SGW;

Step 609, target MME send handover request message to target evolution base station, carry in the described handover request message in the previous step that the S1 carrying is used for SGW user's face address and the TEID that upstream data sends between the evolution base station that receives from target SGW and the target SGW;

The S1 carrying is used for downlink data transmission TEID (the descending TEID of S1) between step 610, target evolution base station distribution evolution base station and the target SGW, target evolution base station sends switching request acknowledgement message to target MME, carries the descending TEID information of above-mentioned S1 in the described switching request acknowledgement message;

Step 611, target MME send to target SGW and create bearing request message, are used for setting up the GTP carrying of converting downlink data message between source SGW and the target SGW;

Step 612, target SGW send to target MME and create bearing response message, are used for setting up the GTP carrying of converting downlink data message between source SGW and the target SGW;

Step 613, target MME send to source MME and transmit the position and upgrade response message, and described forwarding position is upgraded in the response message and carried step 611, the GTP beared information that is used for converting downlink data message between source SGW and the target SGW that target SGW distributes in 612;

Step 614, source MME send to source SGW and create bearing request message, are used for setting up the GTP carrying of converting downlink data message between source SGW and the target SGW;

Step 615, source SGW send to source MME and create the carrying response, are used for setting up the GTP carrying of converting downlink data message between source SGW and the target SGW;

Step 616, source MME send switching command to the source evolution base station;

Step 617, source evolution base station send switching command to user terminal UE;

Step 618, UE initiate to switch, and separate from source evolution base station Source eNodeB, and are attached on the target evolution base station Target eNodeB;

Step 619, UE send switch acknowledgment message to target evolution base station;

Uplink data messages for UE sends by target evolution base station, sends to target SGW; Because in the step 606, target SGW has obtained correct context from PGW, in the step 607, target SGW has opened the uplink message transmission, and therefore, target SGW will transmit above-mentioned uplink message to PGW;

Step 620, target evolution base station send switching notice to target MME;

Step 621, target MME send the renewal of forwarding position and finish message to source MME, because objective network is not reused the context that source MME sends, therefore, need to carry the deleting bearing indication in the above-mentioned message; When source MME receives above-mentioned deleting bearing indication, need to initiate the operation of carrying before deletion is switched.Target MME also can upgrade in above-mentioned forwarding position to finish and not carry the deleting bearing indication in the message, and source MME judges whether the operation of carrying before needing to initiate deletion switches according to whether having sent the unavailable indication of upstream data passage to target MME;

Step 622, source MME send the renewal of forwarding position and finish acknowledge message to target MME; There is not ordinal relation between this step and follow-up step 623～626.

Step 623, source MME send deleting bearing request (Delete Bearer Request) message to source SGW, carry user ID in the described deleting bearing request message, APN information; GTP carrying between deletion source MME and the source SGW;

Step 624, source SGW send agent binding update messages to PGW, carry user ID in the described agent binding update messages, APN information; PMIP tunnel between deletion source SGW and the PGW;

Wherein, source SGW can directly send agent binding update messages to PGW, also can send agent binding update messages to PGW by target IWP;

Step 625, PGW send proxy binding acknowledgment messages to source SGW; After the PMIP tunnel deletion between PGW and the source SGW, PGW sends downlink data message to target SGW;

Wherein, PGW can directly send proxy binding acknowledgment messages to source SGW, also can send proxy binding acknowledgment messages to source SGW by target IWP;

Step 626, source SGW send deleting bearing response (Delete Bearer Response) message to source MME;

Wherein, also can adopt following mode to impel PGW that downlink data is switched to target SGW: target MME and send more new bearer request request to target SGW, target SGW sends that more new bearer request is to PGW, and PGW switches to target SGW with downlink data;

From the above, MME judges when the upstream data passage is unavailable in the present embodiment, transmit the unavailable target SGW that is indicated to of upstream data passage, target SGW closes the upstream data transmission after receiving above-mentioned indication, and after obtaining real context from PGW, opening upstream data and sending by send creating bearing request message, thereby can prevent that the upstream data mistake from sending, guarantee transmission uplink data messages correct when the context of preserving is unavailable.

Introduce the data message dispensing device that the embodiment of the invention provides again, be applied to user terminal in internetwork switching, Fig. 7 has described the structure of data message generating means embodiment one, comprising:

Request transmitting unit 701 is used for sending protocol context request under the unavailable indication of data channel that indication receiving element 701 receives triggers;

Response receiving element 702 is used for receiving the context response of response protocol context request, and the context response comprises the information of available data channel;

Packet sending unit 703 is used for sending datagram by available data channel.

From the above, the present embodiment of data message dispensing device is unavailable in data channel, when the context of namely preserving is unavailable, can send protocol context request and obtain the information of available data channel, and then can send datagram by available data channel, thereby can prevent that the upstream data mistake from sending, guarantee transmission uplink data messages correct when the context of preserving is unavailable.

Further, can be utilized effectively in order to make system resource, the data message generating means that the embodiment of the invention provides can also comprise closing unit, is used for closing data message and sending before request transmitting unit 701 sends protocol context request; The needed resource thereby the minimizing data sending device sends datagram also can avoid data message to send to wrong data reception node simultaneously; Simultaneously can also comprise the unlatching unit, be used for after response receiving element 702 receives the context response, open the data message of being closed by closing unit and send; Thereby guarantee that message generating unit 703 can send datagram by available data channel, guarantees the true(-)running of system.

When the acquisition of information data channel that the data message dispensing device that provides in the embodiment of the invention sends by other equipment is unavailable, the data message dispensing device that the embodiment of the invention provides can also comprise: the indication receiving element, be used for the unavailable indication of receive data passage, the unavailable indication of data channel comprises the disabled information of data channel;

At this moment, request transmitting unit 701 is used for sending protocol context request when the indication receiving element has received the unavailable indication of data channel.

Further, the embodiment of the invention also provides data message dispensing device embodiment two, as shown in Figure 8, comprising:

Indication receiving element 801 is used for the unavailable indication of receive data passage;

Closing unit 802 is used for closing data message and sending after indication receiving element 801 has received the unavailable indication of data channel;

Buffer unit 803 is used for after closing unit 802 is closed the data message transmission data message that buffer memory receives;

Request transmitting unit 804 is used for sending protocol context request under the unavailable indication of data channel that indication receiving element 801 receives triggers;

Response receiving element 805 is used for receiving the context response of response protocol context request, and the context response comprises the information of available data channel;

Open unit 806, be used for after response receiving element 805 receives the context response, open the data message of being closed by closing unit 802 and send;

Packet sending unit 807 is used for sending datagram by available data channel after the data message transmission has been opened in unlatching unit 806; Send the data message of buffer unit 803 buffer memorys by available data channel.

From the above, the data message that the present embodiment of data message dispensing device can buffer memory after the transmission of having closed data message receives, and then by available data channel the data message of buffer memory is sent to data reception node, thereby guarantee that the data message that data reception node receives is correct as far as possible.

The data message dispensing device that the embodiment of the invention provides can be used as SGW and uses, and specifically can be used as the SGW in the network that user terminal switches to, and namely target SGW uses.

Followingly introduce the data message transmitting system that the embodiment of the invention provides, Fig. 9 has described the structure of data message transmitting system embodiment one, comprising again:

The first mobile management node 901 is used for sending the disabled information of data channel when judging that data channel is unavailable;

The first mobile management node specifically can be the mobile management node of network of living in before user terminal switches, i.e. source mobile management node;

The second mobile management node 902 is used for receiving the disabled information of data channel that the first mobile management node sends, and structure also sends the unavailable indication of data channel, and the unavailable indication of data channel comprises the disabled information of data channel;

The second mobile management node specifically can be the mobile management node of network of living in after user terminal switches, i.e. Suitable For Moving-goal Problems management node;

Data message dispensing device 903 is used for the unavailable indication of receive data passage; Under the unavailable indication of data channel triggers, send protocol context request; Receive the context response of response protocol context request, the context response comprises the information of available data channel; Send datagram by available data channel;

The data message dispensing device specifically can be target SGW etc.;

Data message receiving system 904 is used for receiving protocol context request; The response of transmission context; Receiving data packets.

The data message dispensing device specifically can be the IWP in the network after PGW, user terminal switch etc.;

From the above, the data message dispensing device receives the unavailable indication of data channel in the present embodiment, when the context of namely preserving is unavailable, can send protocol context request and obtain the information of available data channel, and then can send datagram by available data channel, thereby can prevent that the upstream data mistake from sending, guarantee transmission uplink data messages correct when the context of preserving is unavailable.

Figure 10 has described the structure of data message transmitting system embodiment two, comprising:

Serving general radio packet service support node 1001 is used for sending the disabled information of data channel when judging that data channel is unavailable;

Mobile management node 1002 is used for the disabled information of receive data passage, and structure also sends the unavailable indication of data channel, and the unavailable indication of data channel comprises the disabled information of described data channel;

Data message dispensing device 1003 is used for the unavailable indication of receive data passage; Under the unavailable indication of data channel triggers, send protocol context request; Receive the context response of response protocol context request, the context response comprises the information of available data channel; Send datagram by available data channel;

Data message receiving system 1004 is used for receiving protocol context request; The response of transmission context; Receiving data packets.

Figure 11 has described the structure of data message transmitting system embodiment three, comprising:

Mobile management node 1101 is used for when judging that data channel is unavailable, and structure also sends the unavailable indication of data channel, and the unavailable indication of data channel comprises the disabled information of data channel;

Data message dispensing device 1102 is used for the unavailable indication of receive data passage; Under the unavailable indication of the described data channel that receives triggers, send protocol context request; Receive the context response of response protocol context request, the context response comprises the information of available data channel; Send datagram by available data channel;

Data message receiving system 1103 is used for receiving protocol context request; The response of transmission context; Receiving data packets.

One of ordinary skill in the art will appreciate that all or part of step that realizes in above-described embodiment method is to come the relevant hardware of instruction to finish by program, described program can be stored in a kind of computer-readable recording medium, this program comprises the steps: when carrying out

After the unavailable indication of receive data passage, send protocol context request;

Send datagram by described available data channel.

The above-mentioned storage medium of mentioning can be read-only memory, disk or CD etc.

Above a kind of data message sending method, device and the communication system that the embodiment of the invention is provided is described in detail, and the explanation of above embodiment just is used for helping to understand method of the present invention and thought thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims

1. a data message sending method is applied to user terminal in internetwork switching, it is characterized in that, comprising:

When data channel is unavailable, send protocol context request; Described data channel is unavailable, and the context of namely preserving is unavailable;

Send datagram by described available data channel.

2. data message sending method as claimed in claim 1 is characterized in that, the transmission protocol context request takes a step forward and comprises:

Closing data message sends;

Send datagram to take a step forward by described available data channel and comprise:

The turn-on data message sends.

3. data message sending method as claimed in claim 2 is characterized in that, closes further to comprise after data message sends:

The data message that buffer memory receives;

The turn-on data message further comprises after sending:

Send the data message of buffer memory by described available data channel.

4. such as the arbitrary described data message sending method of claims 1 to 3, it is characterized in that, described available data channel is general packet radio service channel protocol data channel;

The described protocol context request that sends is the bearer update request, and the described context response of reception is the bearer update response; Or,

The described protocol context request that sends is the load creating request, and the described context response of reception is the load creating response.

5. data message sending method as claimed in claim 4 is characterized in that, the information of the described available data channel that the described context response of reception comprises is the Path end point sign.

6. such as the arbitrary described data message sending method of claims 1 to 3, it is characterized in that, described available data channel is the Generic Routing Encapsulation data channel;

The described protocol context request that sends is the request of proxy mobile IP protocol agent binding update;

The described context response that receives is confirmed for the proxy mobile IP protocol agent binding.

7. data message sending method as claimed in claim 6 is characterized in that, described Generic Routing Encapsulation data channel is Generic Routing Encapsulation upstream data passage;

The described proxy mobile IP protocol agent binding update request that sends comprises the information that the indicating downlink data are not switched.

8. data message sending method as claimed in claim 6 is characterized in that, the information of the described available data channel that the described context response of reception comprises is the generic route encapsulation keyword.

9. data message sending method as claimed in claim 1 is characterized in that, and is described when data channel is unavailable, sends protocol context request and is specially:

When having received the unavailable indication of data channel, send protocol context request, the unavailable indication of described data channel comprises the disabled information of described data channel.

10. a data message dispensing device is applied to user terminal in internetwork switching, it is characterized in that, comprising:

Request transmitting unit is used for sending protocol context request when data channel is unavailable; Described data channel is unavailable, and the context of namely preserving is unavailable;

11. data message dispensing device as claimed in claim 10 is characterized in that, also comprises:

Closing unit is used for before the described request transmitting element sends protocol context request, closes data message and sends;

Open the unit, be used for after described response receiving element receives described context response, the turn-on data message sends.

12. data message dispensing device as claimed in claim 11 is characterized in that, also comprises:

Buffer unit is used for after described closing unit is closed the data message transmission data message that buffer memory receives;

Described packet sending unit is also for the data message that sends described buffer unit buffer memory by described available data channel.

13. such as the described data message dispensing device of claim 10 to 12 any one, it is characterized in that, also comprise:

The indication receiving element is used for the unavailable indication of receive data passage, and the unavailable indication of described data channel comprises the disabled information of described data channel;

The described request transmitting element is used for sending described protocol context request when described receiving element has received the unavailable indication of described data channel.

14. a data message transmitting system is characterized in that, comprising:

The first mobile management node is used for sending the disabled information of data channel when judging that data channel is unavailable; Described data channel is unavailable, and the context of namely preserving is unavailable;

15. a data message transmitting system is characterized in that, comprising:

Serving general radio packet service support node is used for sending the disabled information of data channel when judging that data channel is unavailable; Described data channel is unavailable, and the context of namely preserving is unavailable;

16. a data message transmitting system is characterized in that, comprising:

The mobile management node is used for when judging that data channel is unavailable, and structure also sends the unavailable indication of data channel, and the unavailable indication of described data channel comprises the disabled information of described data channel; Described data channel is unavailable, and the context of namely preserving is unavailable;