CN101572929A - Method, device and system for transmitting messages in switching process - Google Patents
Method, device and system for transmitting messages in switching process Download PDFInfo
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Abstract
The invention discloses a method for transmitting a message in a switching process, comprising the following steps: a mobile management entity (MME) that a user terminal (UE) belongs to sends a first request massage for indicating to create a load to a target service gateway (T S-GW) when confirming that the UE switches from the jurisdiction of a source service gateway (S S-GW) to the jurisdiction of the T S-GW; the T S-GW receives the first request message and sends a second request message for indicating to update the load to a grouped data gateway (P-GW) that the UE belongs to; the P-GW generates a notification message for indicating to finish sending loading data and sends the notification message to a target base (T-eNodeB) that the switched UE belongs to, therefore, the condition that the T-eNodeB cannot judge when an S-eNodeB finishes the loading data transmission due to being incapable of obtaining the notification message is avoided in the process of switching the UE, the effective transmission of the loading data in the network is ensured, the waiting time of the T-eNodeB is reduced, and the system efficiency is improved; and furthermore, the service quality is ensured and the user experience is enhanced. The invention also discloses a corresponding communication device and a communication system.
Description
Technical field
The present invention relates to the communications field, particularly a kind of method, Apparatus and system that in handoff procedure, transmits message.
Background technology
Evolved packet system (Evolved Packet System, EPS) in, (UserEquipment, UE can carry out the transmission of data to user terminal in moving process.When UE when a coverage moves to another coverage, may take place and to change for UE provides the network node of service, for example, (eNodeB) changes in the base station, Mobility Management Entity (Mobility Management Entity, MME) change, and gateway (Serving GW) changes.At this moment, UE need carry out switching flow the relevant information of self is transferred on the destination service node from the source service node, to guarantee the continuous transmission of data and signaling.
At present, defined UE performed switching flow under the situation that Serving GW does not change among the TS23.401, the content that wherein relates to the data forwarding part is: the Serving GW of UE ownership sends an End Marker message to source eNodeB, eNodeB is transmitted to target eNode B with it by the source, target eNode B will be given UE from the carrying data distributing that source eNodeB receives earlier, after receiving the End Marker message that sends from source eNodeB, just will send to UE from the carrying data that Serving GW receives, so just can guarantee that target eNode B can be with orderly the lining up of the data of collecting from different network nodes, avoid target eNode B because of not knowing when source eNodeB finishes to carry the traditional method that forwarding of data will wait for a period of time simultaneously, reduced the time-delay of handling.
But, when UE when a coverage moves to another coverage, if Serving GW also changes in handoff procedure, to there be network node to send End Marker message so, target eNode B then can can't judge when source eNodeB finishes to carry the transmission of data because of can not receive End Marker message, thereby causes efficiency of transmission to descend, like this, just influence service quality to a great extent, and then reduced user experience.
Summary of the invention
The embodiment of the invention provides a kind of method, Apparatus and system that transmits message in handoff procedure, when changing in order to the Serving GW in the UE ownership, guarantees the effective transmission of carrying data in network, improves system effectiveness.
The embodiment that the embodiment of the invention provides is as follows:
A kind of method that transmits message in handoff procedure comprises step:
The Mobility Management Entity MME of the current ownership of user terminal UE determines UE when the compass of competency of source gateway SS-GW switches to the compass of competency of destination service gateway T S-GW, sends to T S-GW to be used to indicate first request message of creating carrying;
Described T S-GW receives described first request message, and sends second request message that is used to indicate the renewal carrying to the packet data gateway P-GW of UE ownership;
Described P-GW produces and is used to indicate the notification message that finishes to send the carrying data, and this notification message is mail to the target BS T-eNodeB that UE is belonged to after switching.
A kind of communicator comprises:
Determining unit is used for determining that user terminal end UE switches to the compass of competency of destination service gateway T S-GW from the compass of competency of source gateway S S-GW;
Generation unit is used to generate first request message of creating carrying in order to indication;
Communication unit is used for sending described first request message to T S-GW.
A kind of communicator comprises:
Receiving element is used to receive first request message of creating carrying in order to indication;
Generation unit is used to generate in order to indicate more second request message of new bearer;
Transmitting element is used for sending described second request message to the packet data gateway P-GW of user terminal UE ownership.
A kind of communicator comprises:
Receiving element is used to receive in order to indicate more second request message of new bearer;
Generation unit is used to generate the notification message that finishes to send the carrying data in order to indication;
Transmitting element is used for described notification message is mail to the target BS T-eNodeB that UE is belonged to after switching.
A kind of communication system comprises:
Mobility Management Entity MME, current this MME that belongs to of user terminal UE, be used for determining that UE switches to the compass of competency of destination service gateway T S-GW from the compass of competency of source gateway S S-GW, and send first request message that is used to indicate the establishment carrying to T S-GW;
Destination service gateway T S-GW is used to receive described first request message, and sends second request message that is used to indicate the renewal carrying to the packet data gateway P-GW of UE ownership;
Packet data gateway P-GW is used to produce be used to indicate and finishes to send the notification message that carries data, and this notification message is mail to the target BS T-eNodeB that UE is belonged to after switching.
In the embodiment of the invention, when UE when the compass of competency of S S-GW switches to the compass of competency of T S-GW, MME upgrades by the gateway of T S-GW notice P-GW current UE, P-GW generates and is used to indicate the notification message that finishes bearer data transmission, and this notification message is mail to the T-eNodeB that UE belongs to after switching.Like this, in the handoff procedure of UE, just avoided T-eNodeB can't judge because of can not receive notification message when S-eNodeB finishes the situation of bearer data transmission, thereby guaranteed the effective transmission of carrying data in network, reduced the time that T-eNodeB waits for, improved system effectiveness, and then guaranteed service quality to have promoted user experience.
Description of drawings
Fig. 1 is an EPS Solution Architecture schematic diagram in the embodiment of the invention;
Fig. 2 A is a MME functional structure chart in the embodiment of the invention;
Fig. 2 B is a T S-GW functional structure chart in the embodiment of the invention;
Fig. 2 C is a PDW-GW functional structure chart in the embodiment of the invention;
Fig. 3 is first kind of switching flow schematic diagram in the embodiment of the invention;
Fig. 4 sets up the tunnel schematic flow sheet in the embodiment of the invention;
Fig. 5 is second kind of switching flow schematic diagram in the embodiment of the invention.
Embodiment
In the EPS system, when UE moves to another coverage from a coverage, and when providing the Serving GW of service to change for UE, in order to make UE can finish handoff procedure smoothly, guarantee the effective transmission of carrying data in network, the Mobility Management Entity MME of the current ownership of user terminal UE determines UE when the compass of competency of source gateway S S-GW switches to the compass of competency of destination service gateway T S-GW, sends to T S-GW to be used to indicate first request message of creating carrying; Described TS-GW receives described first request message, and sends second request message that is used to indicate the renewal carrying to the packet data gateway P-GW of UE ownership; Described P-GW produces and is used to indicate the notification message that finishes to send the carrying data, and this notification message is mail to the target BS T-eNodeB that UE is belonged to after switching.
In actual applications, regulation according to 3GPP TS23.401 agreement, when UE switches and provides the Serving GW of service to change for UE,, UE do not change for providing the packet data gateway (Packet Data Network Gateway, PDN GW) of service.
Its detailed process is: when the Serving GW that service is provided for UE changes, each PDN GW (being designated hereinafter simply as P-GW) that UE connected can receive the renewal bearing request message, and P-GW can upgrade the parameter that comprises in the bearing request message according to this knows the change that whether has Serving GW (hereinafter to be referred as S-GW).In the present embodiment, P-GW can by in following two kinds of methods any one one of learn whether S-GW changes:
1) (renewal TEID) has taken place in Tunnel EndPoint Identifier to upgrade the address of the S-GW that bearing request message carries and Tunnel End Point Identifier.
2) carry a parameter of clearly indicating S-GW to change (ServingGW change Indication) in the renewal bearing request message.
After P-GW determines that S-GW changes, all carryings (Bearer) of the related UE of the renewal bearing request message that receives are sent the renewal of End marker message with notification path.
Below in conjunction with accompanying drawing the preferred embodiment of the present invention is elaborated.
Consult shown in Figure 1ly, in the present embodiment, the EPS system comprises Mobility Management Entity 10 (MME), destination service gateway 11 (T S-GW) and packet data gateway 12 (PDN-GW).
Mobility Management Entity 10 (MME), current this MME that belongs to of UE is used for determining that UE switches to the compass of competency of T S-GW from the compass of competency of SS-GW, and sends first request message that is used to indicate the establishment carrying to T S-GW;
Destination service gateway 11 (T S-GW) is used to receive described first request message, and sends second request message that is used to indicate the renewal carrying to the packet data gateway P-GW of UE ownership;
Packet data gateway 12 (P-GW) is used to produce be used to indicate and finishes to send the notification message that carries data, and this notification message is mail to the target BS T-eNodeB that UE is belonged to after switching.
Consult shown in Fig. 2 A, in the present embodiment, Mobility Management Entity 10 (MME) comprises determining unit 100, generation unit 101 and communication unit 102.
Determining unit 100 is used for determining that user terminal end UE switches to the compass of competency of destination service gateway T S-GW from the compass of competency of source gateway S S-GW;
Consult shown in Fig. 2 B, in the present embodiment, destination service gateway 11 (T S-GW) comprises receiving element 110, generation unit 111 and transmitting element 112.
Receiving element 110 is used to receive first request message of creating carrying in order to indication;
Transmitting element 112 is used for sending described second request message to the P-GW of user terminal UE ownership.
Consult shown in Fig. 2 C, in the present embodiment, packet data gateway 12 (P-GW) comprises receiving element 120, generation unit 121 and transmitting element 122.
Receiving element 120 is used to receive in order to indicate more second request message of new bearer;
Transmitting element 122 is used for described notification message is mail to the target BS T-eNodeB that UE is belonged to after switching.
Based on the said system framework, when S-GW changed, the MME of UE ownership can change, can not change yet, consult shown in Figure 3, in the present embodiment, switched to by S S-GW in the process of TS-GW at UE, the detailed process of first method of P-GW transmission End Marker message is as follows:
The MME of the current ownership of step 300:UE sends to T S-GW and creates bearing request message.In the present embodiment, the MME of the current ownership of UE can switch the front and back MME of service UE all the time for UE, also can be the target MME (T-MME) that UE switches the back ownership.
Step 310:T S-GW sends to P-GW and upgrades bearing request message.
Step 320:P-GW sends to T S-GW and upgrades bearing response message.
Step 330:T S-GW returns the establishment bearing response message to the MME of the current ownership of UE.
Step 340:P-GW sends End marker message to S S-GW, is used to notify all carrying data relevant with this P-GW of S S-GW end of transmission.
In the present embodiment, step 340 also can be carried out after step 320 at once.
On the other hand, in actual applications, non-roaming interface (S5) between S-GW and P-GW or/roaming interface (S8) is for using proxy mobile IP protocol (Proxy Mobility IP, during PMIP) interface, P-GW also can adopt notification message indication S S-GW all carrying data relevant with this P-GW of PMIP type to finish, for example, in binding abolishment indication (Binding RevocationIndication) message, carry End Marker information.The transmission flow of the notification message of PMIP type is consistent with the transmission flow of End Marker message, and present embodiment is that example describes with End Marker message only.
After step 350:S-GW receives End Marker message, transmit this End marker message to source eNodeB (S-eNodeB).
Step 360:S-eNodeB again with End marker forwards to target eNode B (T-eNodeB), with all carrying data of notice T-eNodeB end of transmission, handoff procedure is finished smoothly.
Like this, T-eNodeB just can finish immediately and S-eNodeB between the data forwarding flow process, and continued post-treatment operations.
In the foregoing description, communication system has adopted direct pass-through mode that End Marker message is sent to T-eNodeB, promptly carry data and when switching, directly send to T-eNodeB by S-eNodeB, as shown in Figure 1, this direct pass-through mode only is applicable to the situation that has communication interface (X2) between S-eNodeB and the T-eNodeB.
Be different from the foregoing description, in another case, when between S-eNodeB and the T-eNodeB communication interface not being set, S-eNodeB sends the carrying data to T-eNodeB can only carry out transfer by S-GW, be that S-eNodeB will carry data and send to S S-GW, S-S-GW will carry data forwarding and give TS-GW, T S-GWG will carry data forwarding again and give T-eNodeB, this mode also is referred to as indirect forwarding (Indirect Forwarding) mode, when adopting Indirect Forwarding mode to send the carrying data, End Marker message also will be forwarded along the path that the carrying data send.
GTP tunnel between this moment T S-GW and the T-eNodeB is exactly a section of tunnel after UE switches.Therefore, if under the Indirect Forwarding situation during through T S-GW, the message of carrying End marker ends at T S-GW, so, is responsible for carrying the rearrangement of data by T S-GW rather than T-eNodeB.
Consult shown in Figure 4ly, when adopting Indirect Forwarding mode, communication system is set up and transmitted the employed tunnel of carrying data is to finish in the process of switching, and it is as follows wherein to set up the detailed process of transmitting tunnel segment:
The source MME (S-MME) of ownership sent RELOCATION REQUEST message (Forward Relocation Request) to the target MME (T-MME) that UE switches the back ownership before step 400:UE switched.
In actual applications, when UE switched, the MME of its ownership can not change yet,
Present embodiment is that example describes with situation about changing only.
Step 410:T-MME sends to P-GW and creates bearing request message (Create Bearer Request).
Step 420:P-GW returns to T-MME and creates bearing response message (Create BearerResponse).
Step 430:T-MME sends handoff request message (Handover Request) to T-eNodeB.
Step 440:T-eNodeB returns handoff request acknowledgment message (Handover RequestAck) to T-MME.
Step 450:T-MME sends to P-GW once more and creates bearing request message.
Step 460:P-GW returns the establishment bearing response message to T-MME once more.
In the present embodiment, step 450 and 460 tunnels of being created are used for the tunnel of forwarding indirectly for T S-GW.
Step 470:T-MME returns relocation response message (Forward RelocationResponse) to S-MME.
Based on the foregoing description, consult shown in Figure 5ly, in the present embodiment, switch to by S S-GW in the process of T S-GW at UE, it is as follows that P-GW sends the detailed process of second method (promptly adopting the IndirectForwarding mode) of End Marker message:
The MME of the current ownership of step 500:UE sends to T S-GW and creates bearing request message.
Step 510:T S-GW sends to P-GW and upgrades bearing request message.
Step 520:P-GW sends to T S-GW and upgrades bearing response message.
Step 530:T S-GW returns the establishment bearing response message to the MME of the current ownership of UE.
After step 540:P-GW receives the renewal bearing request message of 510 steps, stop to send the carrying data, and send End marker message, be used to notify all carrying data relevant of S S-GW end of transmission at once with this P-GW to S S-GW to S S-GW.Follow-up carrying data P-GW will send to TS-GW.
In the present embodiment, step 540 also can be carried out after step 520 at once.
Equally, when the S5 interface between S-GW and the P-GW or S8 interface are the PMIP interface, P-GW also can adopt notification message indication S S-GW all carrying data relevant with this P-GW of PMIP type to finish, for example, in Binding Revocation Indication message, carry End Marker information.The transmission flow of the notification message of PMIP type is consistent with the transmission flow of End Marker message, and present embodiment is that example describes with End Marker message only.
After step 550:S S-GW receives End Marker message, transmit this EndMarker message to S-eNodeB.
Step 560:S-eNodeB turns back to S S-GW by transmitting the tunnel with End marker message.
In the present embodiment, owing between S-eNodeB and the T-eNodeB communication interface (X2) is not set, therefore, S-eNodeB can't directly be forwarded to T-eNodeB with End Marker message, it can only be returned.
Step 570:S S-GW is sent to T S-GW with End Marker message.
In the present embodiment, S S-GW is not provided with communication interface (X2) as if knowing in advance between S S-eNodeB and the T-eNodeB, End Marker message directly can be sent to T S-GW yet, and not send it to S-eNodeB earlier, promptly saves step 550 and step 560.
Step 580:T S-GW is sent to T-eNodeB with End Marker message.
Like this, T-eNodeB just can finish immediately and S-eNodeB between the data forwarding flow process, and continued post-treatment operations.
In the above-described embodiments, when T S-GW receives End Marker message and End Marker message can't be sent to T-eNodB because of certain reason, be that End Marker message ends at T S-GW, then T S-GW also can replace T-eNodB to finish follow-up processing operation, to avoid occurring time-delay in the system; As, will arrange in an orderly manner from the carrying data that different network nodes are collected.Do not repeat them here.
On the other hand, in the present embodiment, Fig. 3 and flow process shown in Figure 5 are all carried out according to standard agreement, if standard agreement changes, then corresponding flow process is also just improved thereupon, also repeats no more at this.
In sum, in the embodiment of the invention, when UE when the compass of competency of S S-GW switches to the compass of competency of T S-GW, MME upgrades by the gateway of T S-GW notice P-GW current UE, P-GW generates and is used to indicate the notification message that finishes bearer data transmission, and this notification message is mail to the T-eNodeB that UE belongs to after switching.Like this, in the handoff procedure of UE, just avoided T-eNodeB can't judge because of can not receive notification message when S-eNodeB finishes the situation of bearer data transmission, thereby guaranteed the effective transmission of carrying data in network, reduced the time that T-eNodeB waits for, improved system effectiveness, and then guaranteed service quality to have promoted user experience.
Obviously, those skilled in the art can carry out various changes and modification to the embodiment among the present invention and not break away from the spirit and scope of the present invention.Like this, if these in the embodiment of the invention are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the embodiment among the present invention also is intended to comprise these changes and modification interior.
Claims (19)
1, a kind of method that transmits message in handoff procedure is characterized in that, comprises step:
The Mobility Management Entity MME of the current ownership of user terminal UE determines UE when the compass of competency of source gateway SS-GW switches to the compass of competency of destination service gateway T S-GW, sends to T S-GW to be used to indicate first request message of creating carrying;
Described T S-GW receives described first request message, and sends second request message that is used to indicate the renewal carrying to the packet data gateway P-GW of UE ownership;
Described P-GW produces and is used to indicate the notification message that finishes to send the carrying data, and this notification message is mail to the target BS T-eNodeB that UE is belonged to after switching.
2, the method for claim 1 is characterized in that, the MME of the current ownership of UE is always UE service is provided before and after UE switches, and perhaps, the MME of the current ownership of UE only switches the back at UE provides service for UE.
3, the method for claim 1, it is characterized in that, described T S-GW carries self networks address and Tunnel End Point Identifier in second request message, perhaps, in second request message, carry and be used for the parameter that clear and definite indicating service gateway changes, the renewal of gateway has taken place in communication system in order to notice P-GW.
4, the method for claim 1 is characterized in that, described notification message perhaps carries the binding of End Marker information and abolishes indication Binding RevocationIndication message for finishing sign EndMarker message.
5, as each described method of claim 1-4, it is characterized in that, comprise step when sending described notification message:
P-GW is sent to S S-GW with described notification message;
S S-GW is forwarded to the source base station S-eNodeB that UE belongs to described notification message before switching;
S-eNodeB is forwarded to the target BS T-eNodeB that UE belongs to described notification message after switching.
6, as each described method of claim 1-4, it is characterized in that, comprise step when sending described notification message message:
P-GW is sent to S S-GW with described notification message;
S S-GW is forwarded to T S-GW with described notification message;
T S-GW is forwarded to the target BS T-eNodeB that UE belongs to described notification message after switching.
7, method as claimed in claim 6, it is characterized in that, S S-GW is sent to described notification message before the T S-GW, earlier described notification message is sent to the source base station S-eNodeB that UE belongs to before switching, if S-eNodeB returns this notification message by transmitting the tunnel, then S S-GW is sent to T S-GW with this notification message again.
8, method as claimed in claim 6 is characterized in that, if described notification message ends at T S-GW, then takes over T-eNodeB by T S-GW and finishes post-treatment operations.
9, a kind of communicator is characterized in that, comprising:
Determining unit is used for determining that user terminal end UE switches to the compass of competency of destination service gateway T S-GW from the compass of competency of source gateway S S-GW;
Generation unit is used to generate first request message of creating carrying in order to indication;
Communication unit is used for sending described first request message to T S-GW.
10, a kind of communicator is characterized in that, comprising:
Receiving element is used to receive first request message of creating carrying in order to indication;
Generation unit is used to generate in order to indicate more second request message of new bearer;
Transmitting element is used for sending described second request message to the packet data gateway P-GW of user terminal UE ownership.
11, communicator as claimed in claim 10, it is characterized in that, described generation unit carries the network address and the Tunnel End Point Identifier of this communicator in second request message, perhaps, in second request message, carry and be used for the parameter that clear and definite indicating service gateway changes, the renewal of gateway has taken place in communication system in order to notice P-GW.
12, a kind of communicator is characterized in that, comprising:
Receiving element is used to receive in order to indicate more second request message of new bearer;
Generation unit is used to generate the notification message that finishes to send the carrying data in order to indication;
Transmitting element is used for described notification message is mail to the target BS T-eNodeB that UE is belonged to after switching.
13, a kind of communication system is characterized in that, comprising:
Mobility Management Entity MME, current this MME that belongs to of user terminal UE, be used for determining that UE switches to the compass of competency of destination service gateway T S-GW from the compass of competency of source gateway S S-GW, and send first request message that is used to indicate the establishment carrying to T S-GW;
Destination service gateway T S-GW is used to receive described first request message, and sends second request message that is used to indicate the renewal carrying to the packet data gateway P-GW of UE ownership;
Packet data gateway P-GW is used to produce be used to indicate and finishes to send the notification message that carries data, and this notification message is mail to the target BS T-eNodeB that UE is belonged to after switching.
14, communication system as claimed in claim 13 is characterized in that, described MME is always UE service is provided before and after UE switches, and perhaps, described MME only switches the back at UE provides service for UE.
15, communication system as claimed in claim 13, it is characterized in that, described T S-GW carries self networks address and Tunnel End Point Identifier in second request message, perhaps, in second request message, carry and be used for the parameter that clear and definite indicating service gateway changes, the renewal of gateway has taken place in communication system in order to notice P-GW.
16, communication system as claimed in claim 13, it is characterized in that, the notification message that described P-GW sends perhaps carries the binding of End Marker information and abolishes indication Binding Revocation Indication message for finishing sign End Marker message.
17, as each described communication system of claim 13-16, it is characterized in that, described P-GW is sent to S S-GW with described notification message, S S-GW is forwarded to the source base station S-eNodeB that UE belongs to described notification message before switching, S-eNodeB is forwarded to described notification message the target BS T-eNodeB that UE belongs to again after switching.
18, as each described communication system of claim 13-16, it is characterized in that, described P-GW is sent to S S-GW with described notification message, S S-GW is forwarded to T S-GW with described notification message, and TS-GW is forwarded to described notification message the target BS T-eNodeB that UE belongs to again after switching.
19, communication system as claimed in claim 18 is characterized in that, if described notification message ends at T S-GW, then takes over T-eNodeB by T S-GW and finishes post-treatment operations.
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