CN102006640B

CN102006640B - Switching method and device in LTE system

Info

Publication number: CN102006640B
Application number: CN2010105768387A
Authority: CN
Inventors: 齐志强; 刘强; 余建国; 马赛
Original assignee: Beijing Northern Fiberhome Technologies Co Ltd
Current assignee: Wuhan Research Institute of Posts and Telecommunications Co Ltd; Beijing Northern Fiberhome Technologies Co Ltd
Priority date: 2010-12-07
Filing date: 2010-12-07
Publication date: 2012-11-14
Anticipated expiration: 2030-12-07
Also published as: CN102006640A

Abstract

The embodiment of the invention discloses a switching method and a switching device in a long time evolution (LTE) system. A general data transfer platform (GTP) common tunnel and a forwarding tunnel in an eNB and a target eNB are realized in a switching process through a message interface and signaling interaction between a control surface (CC) module and a GTP layer. The deletion of the common tunnel and the forwarding tunnel after the switching process is finished is realized. Therefore, data packet loss in the switching process is avoided, and smooth switching is realized. According to the embodiment of the invention, the data packet loss in the switching process can be avoided, and the smooth switching can be ensured.

Description

Switching method and apparatus in a kind of LTE system

Technical field

The application relates to the mobile communication technology field, the switching method and apparatus in the particularly a kind of LTE system.

Background technology

LTE (Long Time Evolution, Long Term Evolution) is meant the evolution scheme that competitiveness adopted for the long-term 3GPP of assurance.It is the basis with WCDMA (Wideband Code Division Multiple Access, WCDMA) mainly, through the change network architecture, and adopts the new technology of eating dishes without rice or wine, and can reduce system complexity, and cooperate with different system.LTE is at aspect and UMB and Wimax (Worldwide Interoperability for Microwave Access such as wireless frequency spectrum utilance, propagation delay times.Worldwide interoperability for microwave inserts) coupling; In seamless covering, roaming, multi-modulation scheme interoperability; Aspect such as fail safe and GSM (Global System for Mobile Communications, global system for mobile communications) and WCDMA network match in excellence or beauty, and become the upstart in back 3G epoch.

In GSM; For the travelling carriage of communicating by letter, when it when the overlay area of a base station moves to the overlay area of another one base station, in order to guarantee communication continuity; Network control system can start handoff procedure, to guarantee the continuous transmission of customer service.The so-called switching; Just be meant in communication period at travelling carriage; Because the position changes; And the communication link between travelling carriage and the network is transferred to target BS from current base station, thus travelling carriage is communicated with minimal power and the strongest base station of signal, reduced mobile subscriber's power consumption.In handoff procedure, guarantee that the transfer of communication link can not influence normally carrying out of conversation, that is, realize at short notice taking over seamlessly, make the carrying out of the imperceptible switching of user.In cell mobile communication systems, cell coverage area is more little, and user's translational speed is fast more, and then switching processing is frequent more.

In the LTE system, subordinate relation and position relation according to cell-of-origin and Target cell generally are divided into switching: the switching between LTE intra-system handover and LTE system and the different system.Wherein, the LTE intra-system handover comprise the eNB intra, switch between the eNB that connects through X2 interface with the eNB that is connected through the S1 interface between switch.

To switching between the eNB in the above-mentioned LTE intra-system handover,, just on chain of command, realized a kind of taking over seamlessly according to the existing LTE protocol contents; And do not provide the concrete implementation of handoff procedure; As, GTP (General Data Transfer Platform, the conventional data transmission platform) ordinary crossing in source of configuration eNB and the target eNB and transmit the tunnel how in handoff procedure; And, after finishing switching, how to delete ordinary crossing and transmit the tunnel.When said process can't be realized, promptly can't guarantee the data forwarding in the handoff procedure, thereby can further cause the data packet loss of handoff procedure, finally can't realize taking over seamlessly.

Summary of the invention

In order to solve the problems of the technologies described above, the application provides the switching method and apparatus in a kind of LTE system, to avoid the data packet loss of handoff procedure, guarantees to realize taking over seamlessly.

The application embodiment discloses following technical scheme:

Changing method in a kind of LTE system; Comprise: receive the switching command message of MME transmission as source eNB after; The chain of command CC module of source eNB is through up-downgoing data forwarding tunnel configuration messages interface; Cell-of-origin sign, UE sign and GTP tunnel configuration information are sent to the GTP layer of source eNB, transmit the tunnel so that the GTP layer reconfigures GTP according to the information that receives; After target eNB obtains new RNTI; The chain of command CC module of target eNB is through up-downgoing data forwarding tunnel configuration messages interface; Target Cell Identifier, UE sign and GTP tunnel configuration information are sent to the GTP layer of target eNB, transmit the tunnel so that the GTP layer reconfigures GTP according to the information that receives; When target eNB after MME sends handoff notification message; The chain of command CC module of target eNB is through S-GW configuration messages interface; Target Cell Identifier, UE sign and GTP tunnel configuration information are sent to the GTP layer of target eNB, transmit the tunnel so that the GTP layer reconfigures GTP according to the information that receives; After source eNB is intact with the E-RAB data forwarding; The chain of command CC module of source eNB is through transmitting tunnel deletion message interface; The tunnel information of cell-of-origin sign, UE sign and GTP tunnel to be deleted is sent to the GTP layer of source eNB, so that the GTP layer is transmitted the tunnel according to the information deletion GTP that receives; After target eNB has been sent upstream data; The chain of command CC module of target eNB is through transmitting tunnel deletion message interface; The tunnel information of Target Cell Identifier, UE sign and GTP tunnel to be deleted is sent to the GTP layer of target eNB, so that the GTP layer is transmitted the tunnel according to the information deletion GTP that receives.

Switched system in a kind of LTE system; Comprise: the chain of command CC module of source eNB is used for after source eNB receives the switching command message of MME transmission, through up-downgoing data forwarding tunnel configuration messages interface; Cell-of-origin sign, UE sign and GTP tunnel configuration information are sent to the GTP layer of source eNB; So that the GTP layer reconfigures GTP according to the information that receives and transmits the tunnel, after source eNB is intact with the E-RAB data forwarding, through transmitting tunnel deletion message interface; The tunnel information of cell-of-origin sign, UE sign and GTP tunnel to be deleted is sent to the GTP layer of source eNB, so that the GTP layer is transmitted the tunnel according to the information deletion GTP that receives; The chain of command CC module of target eNB; Be used for after target eNB obtains new RNTI; Through up-downgoing data forwarding tunnel configuration messages interface, Target Cell Identifier, UE sign and GTP tunnel configuration information are sent to the GTP layer of target eNB, so that reconfiguring GTP according to the information that receives, the GTP layer transmits the tunnel; When target eNB after MME sends handoff notification message; Through S-GW configuration messages interface, Target Cell Identifier, UE sign and GTP tunnel configuration information are sent to the GTP layer of target eNB, so that reconfiguring GTP according to the information that receives, the GTP layer transmits the tunnel; After target eNB has been sent upstream data; Through transmitting tunnel deletion message interface, the tunnel information of Target Cell Identifier, UE sign and GTP tunnel to be deleted is sent to the GTP layer of target eNB, so that the GTP layer is transmitted the tunnel according to the information deletion GTP that receives.

Can find out that by the foregoing description the application embodiment through message interface and the Signalling exchange between chain of command CC module and the GTP layer, has realized in the handoff procedure GTP ordinary crossing in eNB and the target eNB and forwarding tunnel on LTE agreement basis.And, realized after handoff procedure finishes deletion ordinary crossing and forwarding tunnel.Thereby avoided the data packet loss in the handoff procedure, realized taking over seamlessly.

Description of drawings

In order to be illustrated more clearly in the application embodiment or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiment of the application, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is the flow chart of an embodiment of the changing method in a kind of LTE of the application system;

Fig. 2 is the signaling process figure that the application's one provenance eNB side realizes switching;

Fig. 3 is the signaling process figure that a kind of target eNB side of the application realizes switching;

Fig. 4 is the structure chart of an embodiment of the switching device shifter in a kind of LTE of the application system.

Embodiment

For above-mentioned purpose, the feature and advantage that make the application can be more obviously understandable, the application embodiment is described in detail below in conjunction with accompanying drawing.

Embodiment one

See also Fig. 1, it is the flow chart of an embodiment of the changing method in a kind of LTE of the application system, said method comprising the steps of:

Step 101: receive the switching command message of MME transmission as source eNB after; The chain of command CC module of source eNB is through up-downgoing data forwarding tunnel configuration messages interface; Cell-of-origin sign, UE sign and GTP tunnel configuration information are sent to the GTP layer of source eNB, transmit the tunnel so that the GTP layer reconfigures GTP according to the information that receives;

Wherein, Up-downgoing data forwarding tunnel configuration messages interface is the self-defining a kind of interface of the application; Between the GTP layer of the chain of command CC module of source eNB and source eNB; The message of up-downgoing data forwarding tunnel configuration messages interface transmission comprises: up-downgoing data forwarding tunnel configuration request message and up-downgoing data forwarding tunnel configuration response message; Wherein, The cell of said up-downgoing data forwarding tunnel configuration request message comprises: cell-of-origin sign, terminal iidentification, tunnel number, radio bearer sign, tunnel type, service quality sign, local tunnel node identification, opposite end tunnel node identification and the opposite end tunnel IP addresses of nodes corresponding with radio bearer, the cell of said up-downgoing data forwarding tunnel configuration response message comprises: cell-of-origin sign, terminal iidentification, tunnel number, radio bearer sign, tunnel type and up-downgoing data forwarding tunnel configuration result.

Through this interface, the signaling that the chain of command CC module of source eNB will be carried cell-of-origin sign, UE sign and GTP tunnel configuration information sends to the GTP layer of source eNB, reconfigures GTP by the GTP layer of source eNB according to the information that receives and transmits the tunnel.

Step 102: after target eNB obtains new RNTI; The chain of command CC module of target eNB is through up-downgoing data forwarding tunnel configuration messages interface; Target Cell Identifier, UE sign and GTP tunnel configuration information are sent to the GTP layer of target eNB, transmit the tunnel so that the GTP layer reconfigures GTP according to the information that receives;

Wherein, Up-downgoing data forwarding tunnel configuration messages interface is the self-defining a kind of interface of the application; Between the GTP layer of the chain of command CC module of target eNB and target eNB; The message of up-downgoing data forwarding tunnel configuration messages interface transmission comprises: up-downgoing data forwarding tunnel configuration request message and up-downgoing data forwarding tunnel configuration response message; Wherein, The cell of said up-downgoing data forwarding tunnel configuration request message comprises: Target Cell Identifier, terminal iidentification, tunnel number, radio bearer sign, tunnel type, service quality sign, local tunnel node identification, opposite end tunnel node identification and the opposite end tunnel IP addresses of nodes corresponding with radio bearer, the cell of said up-downgoing data forwarding tunnel configuration response message comprises: Target Cell Identifier, terminal iidentification, tunnel number, radio bearer sign, tunnel type and up-downgoing data forwarding tunnel configuration result.

Through this interface, the signaling that the chain of command CC module of target eNB will be carried Target Cell Identifier, UE sign and GTP tunnel configuration information sends to the GTP layer of target eNB, reconfigures GTP by the GTP layer of target eNB according to the information that receives and transmits the tunnel.

Step 103: when target eNB after MME sends handoff notification message; The chain of command CC module of target eNB is through S-GW configuration messages interface; Target Cell Identifier, UE sign and GTP tunnel configuration information are sent to the GTP layer of target eNB, transmit the tunnel so that the GTP layer reconfigures GTP according to the information that receives;

Wherein, S-GW configuration messages interface is the self-defining a kind of interface of the application; Between the GTP layer of the chain of command CC of source eNB and source eNB; The message of S-GW configuration messages interface transmission comprises: GTP configuration request message and GTP configuration corresponding message; Wherein, The cell of said GTP configuration request message comprises: Target Cell Identifier, terminal iidentification, tunnel number, radio bearer sign, tunnel type, service quality sign, local tunnel node identification, opposite end tunnel node identification and the opposite end tunnel IP addresses of nodes corresponding with radio bearer, the cell of said GTP configuration response message comprises: Target Cell Identifier, terminal iidentification, tunnel number, radio bearer sign, tunnel type and S-GW configuration result.

Through this interface, the signaling that the chain of command CC module of source eNB will be carried Target Cell Identifier, UE sign and GTP tunnel configuration information sends to the GTP layer of target eNB, reconfigures GTP by the GTP layer of target eNB according to the information that receives and transmits the tunnel.

Step 104: after source eNB is intact with the E-RAB data forwarding; The chain of command CC module of source eNB is through transmitting tunnel deletion message interface; The tunnel information of cell-of-origin sign, UE sign and GTP tunnel to be deleted is sent to the GTP layer of source eNB, so that the GTP layer is transmitted the tunnel according to the information deletion GTP that receives;

Wherein, Transmitting tunnel deletion message interface is the self-defining a kind of interface of the application; Between the GTP layer of the chain of command CC of source eNB and source eNB; The message of transmitting the transmission of tunnel deletion message interface is GTP deletion message, and the cell of said GTP deletion message comprises: Target Cell Identifier, terminal iidentification, tunnel number, radio bearer sign, tunnel type, local tunnel node identification and tunnel, opposite end node identification.

Through this interface, the signaling that the chain of command CC module of source eNB will be carried the tunnel information of cell-of-origin sign, UE sign and GTP tunnel to be deleted sends to the GTP layer of target eNB, transmits the tunnel by the GTP layer of target eNB according to the information deletion GTP that receives.

Step 105: after target eNB has been sent upstream data; The chain of command CC module of target eNB is through transmitting tunnel deletion message interface; The tunnel information of Target Cell Identifier, UE sign and GTP tunnel to be deleted is sent to the GTP layer of target eNB, so that the GTP layer is transmitted the tunnel according to the information deletion GTP that receives.

Above-mentioned steps 101-105 has realized in handoff procedure through the Signalling exchange between chain of command CC module and the GTP layer, GTP ordinary crossing in source of configuration eNB and the target eNB and forwarding tunnel, and, after finishing switching, delete ordinary crossing and transmit the tunnel.

In addition, in the changing method of application embodiment, can also be implemented in source eNB and the target eNB and dispose PDCP through the Signalling exchange between chain of command CC module and the PDCP layer, indication PDCP layer buffer memory and forwarding data, perhaps designation data is transmitted and is accomplished.

Therefore, preferred, said method also comprises:

1, after the up-downgoing data forwarding tunnel of source eNB has disposed; The chain of command CC module of source eNB is obtained message interface through cell-of-origin PDCP SN state; PDCP SN state to the PDCP of source eNB layer acquisition request cell-of-origin is so that the PDCP layer returns the accepting state of up-downgoing PDCP SN and HFN;

Wherein, It is the self-defining a kind of interface of the application that cell-of-origin PDCP SN state obtains message interface; Between the PDCP layer of the chain of command CC module of source eNB and source eNB; The message that cell-of-origin PDCP SN state obtains the message interface transmission comprises: PDCP SN status request message and PDCP SN status response message; Wherein, The cell of said PDCP SN status request message comprises: the radio bearer number of Target Cell Identifier, terminal iidentification, request and the set of radio bearer sign, the cell of said PDCP SN status response message comprises: the radio bearer number of Target Cell Identifier, terminal iidentification, request, the accepting state of up PDCP service data unit, up-link frame number, up Hyper Frame Number, downlink system frame number and descending Hyper Frame Number.

Through this interface, the chain of command CC module of source eNB sends to the PDCP layer of source eNB with the signaling of the PDCP SN state of acquisition request cell-of-origin, is returned the accepting state of up-downgoing PDCP SN and HFN according to the signaling that receives by the PDCP layer of target eNB.

2, after source eNB starts the up-downgoing data forwarding; The chain of command CC module of source eNB is through up-downgoing data forwarding message interface; Cell-of-origin sign, UE sign and data forwarding type are sent to the PDCP layer of source eNB, so that the PDCP layer is transmitted the up-downgoing data according to the information that receives to target eNB;

Wherein, Up-downgoing data forwarding message interface is the self-defining a kind of interface of the application; Between the PDCP layer of the chain of command CC module of source eNB and source eNB; The message of up-downgoing data forwarding message interface transmission comprises: up-downgoing data forwarding request message and up-downgoing data forwarding response message; Wherein, the cell of said up-downgoing data forwarding request message comprises: the bitmap of the number of the radio bearer of Target Cell Identifier, terminal iidentification, forwarding type, forwarding and the radio bearer of forwarding, the cell of said up-downgoing data forwarding response message comprises: Target Cell Identifier, terminal iidentification, forwarding type and forwarding result.

Through this interface, the signaling that the chain of command CC module of source eNB will be carried cell-of-origin sign, UE sign and data forwarding type sends to the PDCP layer of source eNB, transmits up-downgoing data according to the information that receives to target eNB by the PDCP layer of target eNB.

3, after source eNB was intact with the E-RAB data forwarding, the PDCP layer of source eNB was transmitted through the PDCP designation data and is accomplished message interface, and End Market message is sent to target eNB, and the forwarding of the chain of command CC module data of notification source eNB is accomplished;

Wherein, The PDCP designation data is transmitted and accomplished message interface is the self-defining a kind of interface of the application; Between the PDCP layer of the chain of command CC module of source eNB and source eNB; It is up-downgoing data forwarding end that the PDCP designation data is transmitted the message of accomplishing the message interface transmission, and the cell of said up-downgoing data forwarding end comprises: the radio bearer sign that Target Cell Identifier, terminal iidentification and forwarding are accomplished.

Through this interface, the PDCP layer of source eNB sends to target eNB with End Market message, and the chain of command CC module data of notification source eNB is transmitted completion.

4, when target eNB after MME sends Handover Request Acknowledge message; The data-message interface that the chain of command CC module of target eNB inserts through PDCP buffer memory UE; Target Cell Identifier, UE sign and data forwarding configuration information are sent to the PDCP layer of target eNB, so that the data of PDCP layer after inserting according to the information cache UE that receives;

Wherein, The data-message interface of PDCP buffer memory UE interface is the self-defining a kind of interface of the application; Between the PDCP layer of the chain of command CC module of target eNB and target eNB; The message of the data-message interface transmission that PDCP buffer memory UE inserts comprises: PDCP cache request message and PDCP cache responses message; Wherein, the cell of said PDCP cache request message comprises: Target Cell Identifier, terminal iidentification and buffer memory type, the cell of said PDCP cache responses message comprises: Target Cell Identifier, terminal iidentification, the gentle result that deposits of buffer memory type.Through this interface, the signaling that the chain of command CC module of target eNB will be carried Target Cell Identifier, UE sign and data forwarding configuration information sends to the PDCP layer of target eNB, the data after being inserted according to the information cache UE that receives by the PDCP layer.

5, after target eNB receives the MME Status Transfer message of MME transmission; The chain of command CC module of target eNB is through Target cell PDCP SN state configuration message interface; Target Cell Identifier, UE sign and PDCP SN state parameter are sent to the PDCP layer of target eNB, so that the PDCP layer is according to the PDCP SN and the HFN of the information configuration target eNB that receives;

Wherein, PDCP SN state configuration message interface is the self-defining a kind of interface of the application; Between the PDCP layer of the chain of command CC module of target eNB and target eNB; The message of PDCP SN state configuration message interface transmission comprises: PDCP SN state configuration request message and PDCP SN state configuration response message; Wherein, The cell of said PDCP SN state configuration request message comprises: the radio bearer number of Target Cell Identifier, terminal iidentification, request, the accepting state of up PDCP service data unit, up-link frame number, up Hyper Frame Number, downlink system frame number and descending Hyper Frame Number, the cell of said PDCP SN state configuration response message comprises: Target Cell Identifier, terminal iidentification, PDCP SN state configuration result.

Through this interface, the signaling that the chain of command CC module of target eNB will be carried Target Cell Identifier, UE sign and PDCP SN state parameter sends to the PDCP layer of target eNB, by PDCP SN and the HFN of PDCP layer according to the information configuration target eNB that receives.

6, after target eNB receives the RRC reprovision completion message of UE transmission; The chain of command CC module of target eNB is sent message interface through downlink data; Target Cell Identifier, UE sign and data forwarding configuration information are sent to the PDCP layer of target eNB, so that the PDCP layer sends downlink data according to the information that receives;

Wherein, It is the self-defining a kind of interface of the application that downlink data sends message interface; Between the PDCP layer of the chain of command CC module of target eNB and target eNB; The message that downlink data sends the message interface transmission comprises: downlink data sends a request message and downlink data sends response message; Wherein, the cell that said downlink data sends a request message comprises: the bitmap of the number of the radio bearer of Target Cell Identifier, terminal iidentification, transmission types, transmission and the radio bearer of descending transmission, the cell that said downlink data sends response message comprises: Target Cell Identifier, terminal iidentification, transmission types and transmission result.

Through this interface, the PDCP layer that the signaling that the chain of command CC module of target eNB will be carried Target Cell Identifier, UE sign and data forwarding configuration information sends to target eNB sends downlink data by the PDCP layer according to the information that receives.

7, after the S-GW on the target eNB has disposed; The chain of command CC module of target eNB is sent message interface through upstream data; Target Cell Identifier, UE sign and data forwarding configuration information are sent to the PDCP layer of target eNB, so that the PDCP layer sends upstream data according to the information that receives;

Wherein, It is the self-defining a kind of interface of the application that upstream data sends message interface; Between the PDCP layer of the chain of command CC module of target eNB and target eNB; The message that upstream data sends the message interface transmission comprises: upstream data sends a request message and upstream data sends response message; Wherein, the cell that said upstream data sends a request message comprises: Target Cell Identifier, terminal iidentification and transmission types, the cell that said upstream data sends response message comprises: Target Cell Identifier, terminal iidentification, transmission types and transmission result.

Through this interface, the PDCP layer that the signaling that the chain of command CC module of target eNB will be carried Target Cell Identifier, UE sign and data forwarding configuration information sends to target eNB sends upstream data by the PDCP layer according to the information that receives.

In addition, in the changing method of application embodiment, can also be implemented in the new RNTI of distribution in source eNB and the target eNB through the Signalling exchange between chain of command CC module and the MAC layer.

Therefore, preferred, said method also comprises:

After the RRM of target eNB resource is examined successfully; The chain of command CC module of target eNB is obtained message interface through new RNTI; The configuration information of Target Cell Identifier, UE sign and channel to be accessed is sent to the MAC layer of target eNB, distribute new RNTI so that the MAC layer is a target eNB.

Wherein, It is the self-defining a kind of interface of the application that new RNTI obtains message interface; Between the MAC layer of the chain of command CC module of target eNB and target eNB; The message that new RNTI obtains the message interface transmission comprises that RNTI obtains request message and RNTI obtains response message; Wherein, the cell that said RNTI obtains request message comprises: Target Cell Identifier, terminal iidentification, terminal access style, terminal access lead index, terminal access channel index, the cell that said RNTI obtains response message comprises: the new RNTI sign at Target Cell Identifier, terminal iidentification and terminal.

Through this interface, signaling that the chain of command CC module of target eNB will be carried the configuration information of Target Cell Identifier, UE sign and channel to be accessed sends to the MAC layer of target eNB, is that target eNB is distributed new RNTI by the MAC layer.

Can find out by the foregoing description; The application embodiment is on LTE agreement basis; Through message interface and the Signalling exchange between chain of command CC module and the GTP layer, realized in the handoff procedure the GTP ordinary crossing in eNB and the target eNB and the configuration of transmitting the tunnel.And, realized after handoff procedure finishes deletion ordinary crossing and forwarding tunnel.Thereby avoided the data packet loss in the handoff procedure, realized taking over seamlessly.

In addition; Through message interface and the Signalling exchange between chain of command CC module and PDCP layer and the MAC; Realized in the handoff procedure configuration to PDCP in eNB and the target eNB; And indicated the PDCP in the handoff procedure data cached, transmit data, data forwarding is accomplished, and obtains new RNTI.Realized taking over seamlessly.

Embodiment two

Below to switch to example between the eNB that connects through the S1 interface; The explanation of eNB side is handoff procedure and after the finishing switching from the source; The chain of command CC module of source eNB respectively and carry out alternately between the GTP layer of source eNB, PDCP layer and the MAC realizes the concrete implementation procedure that takes over seamlessly.See also Fig. 2, it is the signaling process figure that the application's one provenance eNB side realizes switching, may further comprise the steps:

Step 201: source eNB is through the measurement rule of roaming restricted information configuration UE;

Step 202:UE triggers reporting of measurement report according to the measurement rule of appointment;

Step 203: source eNB is according to measurement report and the RRM information of UE, and the switching based on the S1 interface is carried out in decision;

Step 204: source eNB sends to switch to MME and requires message (Handover required);

Wherein, required information when in this message, including target eNB and carrying out resource allocation, that is, and the radio related information of the source eNB of target side sign and transparent transmission.

Step 205:MME sends handoff request message (Handover request) to target eNB, the request Resources allocation;

Step 206: target eNB is carried out the audit of RRM resource, returns switching request response (Handover request Acknowledge) message to MME after distributing respective resources;

Step 207:MME sends switching command message (Handover Command) to source eNB;

Wherein, required information when including target eNB in this message and carrying out resource allocation, that is, and the radio related information of the source eNB of target side sign and transparent transmission.

Step 208: source eNB prepares to carry out switching after receiving switching command message, and stops the downlink data transmission;

Step 209: the CC module of source eNB is sent up-downgoing to the GTP layer and is transmitted the tunnel configuration request message;

Wherein, the CC module of source eNB is sent this message through up-downgoing data forwarding tunnel configuration messages interface, comprises cell-of-origin sign, UE sign and GTP tunnel configuration information in this message.

Step 210:GTP layer is transmitted the tunnel configuration request message according to the up-downgoing that receives and is reconfigured local GTP forwarding tunnel, and returns up-downgoing and transmit the tunnel configuration response message;

Step 211: after the up-downgoing data forwarding tunnel of source eNB had disposed, the CC module of source eNB was sent cell-of-origin PDCP SN status request message, acquisition request PDCP SN state to the PDCP layer;

Wherein, the CC module of source eNB is obtained message interface through cell-of-origin PDCP SN state and is sent this message.

After step 212:PDCP layer receives cell-of-origin PDCP SN status request message, return cell-of-origin PDCP SN status response message;

Wherein, in the PDCP SN status response message of cell-of-origin, comprise the accepting state of up PDCP SN and HFN, and, the accepting state of descending PDCP SN and HFN.

Step 213: source eNB is configured local E-RAB;

Step 214: source eNB sends the RRC reallocation message to UE;

Wherein, source eNB fills in the RRC reallocation message according to the radio related information of the source eNB side of the transparent transmission in the switching command message (Handover Command).

Step 215: source eNB sends base station state transitions (eNB Status Transfer) message to MME;

Wherein, source eNB is according to up PDCP SN that obtains from PDCP and the accepting state of HFN, and the accepting state of descending PDCP SN and HFN is filled in base station state transitions message.

Step 216:MME sends MME state transitions (MME Status Transfer) message to target eNB;

Step 217: source eNB starts the up-downgoing data forwarding;

Step 218: after source eNB started the up-downgoing data forwarding, the CC module of source eNB was sent up-downgoing data forwarding request message to the PDCP layer;

Wherein, the CC module of source eNB sends to message through up-downgoing data forwarding message interface, and this message comprises cell-of-origin sign, UE sign and data forwarding type.

After step 219:PDCP layer is received up-downgoing data forwarding request message, transmit the up-downgoing data to target eNB, and return up-downgoing data forwarding response message;

Step 220:UE and target eNB obtain synchronously;

Step 221:UE sends the RRC reprovision to target eNB and accomplishes message;

Step 222: target eNB is sent switching notice (Handover Notify) message to MME, and notice MME handover success is accomplished;

Carry out more new bearer between step 223:NME and the S-GW;

Downlink path is switched in step 224:S-GW decision;

Step 225: after data forwarding was accomplished, S-GW sent End Marker message to source eNB;

Step 226:MME sends UE context deletion request (UE Context Release) message, the local resource of request deletion source eNB to source eNB;

Step 227: source eNB transmits the E-RAB data to target eNB;

Step 228: after source eNB was intact with the E-RAB data forwarding, the PDCP course target eNB of source eNB was sent End Marker message;

Wherein, the PDCP layer of source eNB is transmitted through the PDCP designation data and is accomplished this message of message interface transmission.

Step 229: after source eNB was intact with the E-RAB data forwarding, the PDCP course source eNB of source eNB sent the PDCP designation data and transmits completion message;

Step 230: after source eNB was intact with the E-RAB data forwarding, the chain of command CC module of source eNB was sent tunnel deletion message to the GTP of source eNB layer, and GTP transmits the tunnel by the deletion of GTP layer;

Wherein, the chain of command CC module of source eNB is sent this message through transmitting tunnel deletion message interface, and this message comprises the tunnel information of cell-of-origin sign, UE sign and GTP tunnel to be deleted.

Step 231: eNB deletion in source is the UE assigned radio resource, and the handover success of source eNB side is accomplished.

Embodiment three

Below to switch to example between the eNB that connects through the S1 interface; Explain handoff procedure and after the finishing switching from the target eNB side; The chain of command CC module of target eNB respectively and carry out alternately between the GTP layer of target eNB, PDCP layer and the MAC realizes the concrete implementation procedure that takes over seamlessly.See also Fig. 3, it is the signaling process figure that a kind of target eNB side of the application realizes switching, may further comprise the steps:

Step 301: source eNB is through the measurement rule of roaming restricted information configuration UE;

Step 302:UE triggers reporting of measurement report according to the measurement rule of appointment;

Step 303: source eNB is according to measurement report and the RRM information of UE, and the switching based on the S1 interface is carried out in decision;

Step 304: source eNB sends to switch to MME and requires (Handover Required) message;

Step 305:MME sends handoff request (Handover Request) message to target eNB, the request Resources allocation;

Step 306: target eNB is carried out the audit of RRM resource, returns switching request response (Handover request Acknowledge) message to MME after distributing respective resources;

Step 307: after the RRM of target eNB resource was examined successfully, the CC module of target eNB was sent new RNTI request message, the RNTI that acquisition request is new to the MAC of target eNB layer;

Wherein, the CC module of target eNB is obtained message interface through new RNTI and is sent this message, and this message comprises the configuration information of Target Cell Identifier, UE sign and channel to be accessed.

Step 308: the MAC layer of target eNB is that target eNB is distributed new RNTI, and returns new RNTI response message;

Step 309: after target eNB obtained new RNTI, the CC module of target eNB was sent up-downgoing to the GTP of target eNB layer and is transmitted the tunnel configuration request message;

Wherein, the CC module of target eNB is transmitted the tunnel configuration message interface through up-downgoing and is sent this message, and this message comprises Target Cell Identifier, UE sign and tunnel configuration information.

Step 310: the GTP layer of target eNB returns up-downgoing and transmits the tunnel configuration response message after transmitting the tunnel according to the information configuration up-downgoing that receives;

Step 311: target eNB is carried out local E-RAB configuration;

Step 312: target eNB is sent Handover Request Acknowledge (Handover Request Acknowledge) message to MME;

Wherein, target eNB is constructed this message according to the result of RRM resource audit.

Step 313: when target eNB after MME sends Handover RequestAcknowledge message, the CC module of target eNB is sent the data request information after PDCP buffer memory UE inserts to the PDCP of target eNB layer;

Wherein, the data-message interface that the CC module of target eNB inserts through PDCP buffer memory UE sends the data request information after PDCP buffer memory UE inserts, and this message comprises Target Cell Identifier, UE sign and data forwarding configuration information.

Data after step 314:PDCP layer inserts according to the information cache UE that receives, and return the data response message after PDCP buffer memory UE inserts.

Step 315:MME sends switching command (Handover Command) message to source eNB;

Step 316: source eNB sends the RRC reallocation message to UE;

Step 317: source eNB sends base station state transitions (eNB Status Transfer) message to MME;

Step 318:MME sends MME state transitions (MME Status Transfer) message to target eNB;

Step 319: receive the MME Status Transfer message of MME transmission when target eNB after, the CC module of target eNB is sent the PDCP SN state configuration message of Target cell to the PDCP of target eNB layer;

Wherein, the PDCP SN state configuration message that the CC module of target eNB is sent Target cell through the PDCP SN state configuration message interface of Target cell, this message comprise Target Cell Identifier, UE sign and PDCP SN state parameter.

Step 320:PDCP layer is according to the PDCP SN and the HFN of the information configuration target eNB that receives, and returns the PDCP SN state configuration acknowledge message of Target cell;

Step 321: when source eNB when target eNB is transmitted data, the target eNB buffer memory is from the data of cell-of-origin;

Step 322:UE and target eNB obtain synchronously;

Step 323:UE sends the RRC reprovision to target eNB and accomplishes message;

Step 324: receive the RRC reprovision completion message of UE transmission when target eNB after, the CC module of target eNB is sent downlink data to the PDCP of target eNB layer and is sent a request message;

Wherein, the CC module of target eNB is sent message interface transmission downlink data through downlink data and is sent a request message, and this message comprises Target Cell Identifier, UE sign and data forwarding configuration information.

Step 325:PDCP layer sends downlink data according to the information that receives, and returns downlink data and send response message;

Step 326: target eNB is sent downlink data;

Step 327: target eNB is sent switching notice (Handover Notify) message to MME, and completion is switched in indication;

Step 328: when target eNB after MME sends handoff notification message, the CC module of target eNB is sent the S-GW configuration request message to the GTP of target eNB layer;

Wherein, the CC module of target eNB is sent the S-GW configuration request message through S-GW configuration messages interface, and this message comprises Target Cell Identifier, UE sign and GTP tunnel configuration information.

Step 329:GTP layer reconfigures GTP according to the information that receives and transmits the tunnel, and returns the S-GW configuration response message;

Step 330: after the S-GW on the target eNB had disposed, the CC module of target eNB was sent upstream data to the PDCP of target eNB layer and is sent a request message;

Wherein, the chain of command CC module of target eNB is sent this message through the upstream data transmission interface, and this message comprises Target Cell Identifier, UE sign and data forwarding configuration information.

Step 331:PDCP layer sends upstream data according to the information that receives, and returns the S-GW configuration response message;

Step 332: target eNB is sent upstream data;

Step 333: after target eNB had been sent upstream data, the CC module of the PDCP course target eNB of target eNB was sent designation data and is sent completion message;

Wherein, the PDCP layer of target eNB is transmitted through the PDCP designation data and is accomplished this message of message interface transmission.

Step 334: after target eNB had been sent upstream data, the CC module of target eNB was sent deletion to the GTP of target eNB layer and is transmitted tunnel message, and the GTP layer is transmitted the tunnel according to the information deletion GTP that receives;

Wherein, the CC module of target eNB is sent this message through transmitting tunnel deletion message interface, and this message comprises the tunnel information of Target Cell Identifier, UE sign and GTP tunnel to be deleted.

Carry out more new bearer between step 335:MME and the S-GW;

Downlink path is switched in step 336:S-GW decision;

Step 337: after data forwarding was accomplished, S-GW sent End Marker message to source eNB;

Step 338:MME sends UE context deletion request (UE Context Release) message, the local resource of request deletion source eNB to source eNB;

Step 339: after target eNB had been sent upstream data, the PDCP course target eNB of target eNB was sent End Marker message.

Wherein, the PDCP layer of target eNB is transmitted through the PDCP designation data and is accomplished this message of message interface transmission, and the chain of command CC module data of notification target eNB is transmitted and accomplished.

Embodiment four

Corresponding with the changing method in a kind of LTE system; The application embodiment also provides the switching device shifter in a kind of LTE system; See also Fig. 4; It is the structure chart of an embodiment of the switching device shifter in a kind of LTE of the application system, and this device comprises: the chain of command CC module 401 of source eNB and the chain of command CC module 402 of target eNB, further introduce its internal structure and annexation below in conjunction with the operation principle of this device.

The chain of command CC module 401 of source eNB; Be used for after source eNB receives the switching command message of MME transmission; Through up-downgoing data forwarding tunnel configuration messages interface, cell-of-origin sign, UE sign and GTP tunnel configuration information are sent to the GTP layer of source eNB, so that reconfiguring GTP according to the information that receives, the GTP layer transmits the tunnel; After source eNB is intact with the E-RAB data forwarding; Through transmitting tunnel deletion message interface, the tunnel information of cell-of-origin sign, UE sign and GTP tunnel to be deleted is sent to the GTP layer of source eNB, so that the GTP layer is transmitted the tunnel according to the information deletion GTP that receives;

The chain of command CC module 402 of target eNB; Be used for after target eNB obtains new RNTI; Through up-downgoing data forwarding tunnel configuration messages interface, Target Cell Identifier, UE sign and GTP tunnel configuration information are sent to the GTP layer of target eNB, so that reconfiguring GTP according to the information that receives, the GTP layer transmits the tunnel; When target eNB after MME sends handoff notification message; Through S-GW configuration messages interface, Target Cell Identifier, UE sign and GTP tunnel configuration information are sent to the GTP layer of target eNB, so that reconfiguring GTP according to the information that receives, the GTP layer transmits the tunnel; After target eNB has been sent upstream data; Through transmitting tunnel deletion message interface, the tunnel information of Target Cell Identifier, UE sign and GTP tunnel to be deleted is sent to the GTP layer of target eNB, so that the GTP layer is transmitted the tunnel according to the information deletion GTP that receives.

The above-mentioned Signalling exchange that passes through between chain of command CC module and the GTP layer has been realized in handoff procedure, GTP ordinary crossing in source of configuration eNB and the target eNB and forwarding tunnel, and, deletion ordinary crossing and forwarding tunnel after finishing switching.

In addition, in the switching device shifter of application embodiment, can also be implemented in source eNB and the target eNB and dispose PDCP through the Signalling exchange between chain of command CC module and the PDCP layer, indication PDCP layer buffer memory and forwarding data, perhaps designation data is transmitted and is accomplished.

Preferably; The chain of command CC module of said source eNB also is used for, and after the up-downgoing data forwarding tunnel of source eNB has disposed, obtains message interface through cell-of-origin PDCP SN state; PDCP SN state to the PDCP of source eNB layer acquisition request cell-of-origin; So that the PDCP layer returns the accepting state of up-downgoing PDCP SN and HFN, after source eNB starts the up-downgoing data forwarding, through up-downgoing data forwarding message interface; Cell-of-origin sign, UE sign and data forwarding type are sent to the PDCP layer of source eNB, so that the PDCP layer is transmitted the up-downgoing data according to the information that receives to target eNB;

The chain of command CC module of said target eNB also is used for, and after target eNB obtains new RNTI, transmits the tunnel configuration message interface through up-downgoing; Target Cell Identifier, UE sign and tunnel configuration information are sent to the PDCP layer of target eNB; So that the PDCP layer is transmitted the tunnel according to the information configuration up-downgoing that receives, when target eNB after MME sends Handover Request Acknowledge message, the data-message interface that inserts through PDCP buffer memory UE; Target Cell Identifier, UE sign and data forwarding configuration information are sent to the PDCP layer of target eNB; So that the data after the PDCP layer inserts according to the information cache UE that receives, after target eNB receives the MME Status Transfer message that MME sends, through Target cell PDCP SN state configuration message interface; Target Cell Identifier, UE sign and PDCP SN state parameter are sent to the PDCP layer of target eNB; So that the PDCP layer according to the PDCP SN and the HFN of the information configuration target eNB that receives, receives the RRC reprovision completion message of UE transmission when target eNB after, send message interface through downlink data; Target Cell Identifier, UE sign and data forwarding configuration information are sent to the PDCP layer of target eNB; So that the PDCP layer sends downlink data according to the information that receives, after the S-GW on the target eNB has disposed, send message interface through upstream data; Target Cell Identifier, UE sign and data forwarding configuration information are sent to the PDCP layer of target eNB, so that the PDCP layer sends upstream data according to the information that receives;

Then; Said system also comprises: the PDCP layer of source eNB, be used for after source eNB is intact with the E-RAB data forwarding, and transmit through the PDCP designation data and accomplish message interface; End Market message is sent to target eNB, and the chain of command CC module data of notification source eNB is transmitted completion;

The PDCP layer of target eNB is used for after target eNB has been sent upstream data, transmits through the PDCP designation data and accomplishes message interface, and the chain of command CC module data of notification target eNB is transmitted and accomplished.

In addition, in the switching device shifter of application embodiment, can also be implemented in the new RNTI of distribution in source eNB and the target eNB through the Signalling exchange between chain of command CC module and the MAC layer.

Further preferred; The chain of command CC module of said target eNB also is used for; After the RRM of target eNB resource is examined successfully; Obtain message interface through new RNTI, the configuration information of Target Cell Identifier, UE sign and channel to be accessed is sent to the MAC layer of target eNB, distribute new RNTI so that the MAC layer is a target eNB.

Need to prove; One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method; Be to instruct relevant hardware to accomplish through computer program; Described program can be stored in the computer read/write memory medium, and this program can comprise the flow process like the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.

More than the switching method and apparatus in the application provided a kind of LTE system has been carried out detailed introduction; Used specific embodiment among this paper the application's principle and execution mode are set forth, the explanation of above embodiment just is used to help to understand the application's method and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to the application's thought, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as the restriction to the application.

Claims

1. the changing method in the LTE system is characterized in that, comprising:

Receive the switching command message of MME transmission as source eNB after; The chain of command CC module of source eNB is through up-downgoing data forwarding tunnel configuration messages interface; Cell-of-origin sign, UE sign and GTP tunnel configuration information are sent to the GTP layer of source eNB, transmit the tunnel so that the GTP layer reconfigures GTP according to the information that receives;

After target eNB obtains new RNTI; The chain of command CC module of target eNB is through up-downgoing data forwarding tunnel configuration messages interface; Target Cell Identifier, UE sign and GTP tunnel configuration information are sent to the GTP layer of target eNB, transmit the tunnel so that the GTP layer reconfigures GTP according to the information that receives;

When target eNB after MME sends handoff notification message; The chain of command CC module of target eNB is through S-GW configuration messages interface; Target Cell Identifier, UE sign and GTP tunnel configuration information are sent to the GTP layer of target eNB, transmit the tunnel so that the GTP layer reconfigures GTP according to the information that receives;

After source eNB is intact with the E-RAB data forwarding; The chain of command CC module of source eNB is through transmitting tunnel deletion message interface; The tunnel information of cell-of-origin sign, UE sign and GTP tunnel to be deleted is sent to the GTP layer of source eNB, so that the GTP layer is transmitted the tunnel according to the information deletion GTP that receives;

After target eNB has been sent upstream data; The chain of command CC module of target eNB is through transmitting tunnel deletion message interface; The tunnel information of Target Cell Identifier, UE sign and GTP tunnel to be deleted is sent to the GTP layer of target eNB, so that the GTP layer is transmitted the tunnel according to the information deletion GTP that receives.

2. method according to claim 1; It is characterized in that; The message of said S-GW configuration messages interface transmission comprises: GTP configuration request message and GTP configuration corresponding message; Wherein, The cell of said GTP configuration request message comprises: Target Cell Identifier, terminal iidentification, tunnel number, radio bearer sign, tunnel type, service quality sign, local tunnel node identification, opposite end tunnel node identification and the opposite end tunnel IP addresses of nodes corresponding with radio bearer, the cell of said GTP configuration response message comprises: Target Cell Identifier, terminal iidentification, tunnel number, radio bearer sign, tunnel type and S-GW configuration result.

3. method according to claim 1; It is characterized in that; The message of said up-downgoing data forwarding tunnel configuration messages interface transmission comprises: up-downgoing data forwarding tunnel configuration request message and up-downgoing data forwarding tunnel configuration response message; Wherein, The cell of said up-downgoing data forwarding tunnel configuration request message comprises: Target Cell Identifier, terminal iidentification, tunnel number, radio bearer sign, tunnel type, service quality sign, local tunnel node identification, opposite end tunnel node identification and the opposite end tunnel IP addresses of nodes corresponding with radio bearer, the cell of said up-downgoing data forwarding tunnel configuration response message comprises: Target Cell Identifier, terminal iidentification, tunnel number, radio bearer sign, tunnel type and up-downgoing data forwarding tunnel configuration result.

4. method according to claim 1; It is characterized in that; The message of said forwarding tunnel deletion message interface transmission is GTP deletion message, and the cell of said GTP deletion message comprises: Target Cell Identifier, terminal iidentification, tunnel number, radio bearer sign, tunnel type, local tunnel node identification and tunnel, opposite end node identification.

5. method according to claim 1 is characterized in that, said method also comprises:

After the up-downgoing data forwarding tunnel of source eNB has disposed; The chain of command CC module of source eNB is obtained message interface through cell-of-origin PDCP SN state; PDCP SN state to the PDCP of source eNB layer acquisition request cell-of-origin is so that the PDCP layer returns the accepting state of up-downgoing PDCP SN and HFN;

After source eNB starts the up-downgoing data forwarding; The chain of command CC module of source eNB is through up-downgoing data forwarding message interface; Cell-of-origin sign, UE sign and data forwarding type are sent to the PDCP layer of source eNB, so that the PDCP layer is transmitted the up-downgoing data according to the information that receives to target eNB;

After source eNB was intact with the E-RAB data forwarding, the PDCP layer of source eNB was transmitted through the PDCP designation data and is accomplished message interface, and End Market message is sent to target eNB, and the forwarding of the chain of command CC module data of notification source eNB is accomplished;

When target eNB after MME sends Handover Request Acknowledge message; The data-message interface that the chain of command CC module of target eNB inserts through PDCP buffer memory UE; Target Cell Identifier, UE sign and data forwarding configuration information are sent to the PDCP layer of target eNB, so that the data of PDCP layer after inserting according to the information cache UE that receives;

Receive the MME Status Transfer message of MME transmission when target eNB after; The chain of command CC module of target eNB is through Target cell PDCP SN state configuration message interface; Target Cell Identifier, UE sign and PDCP SN state parameter are sent to the PDCP layer of target eNB, so that the PDCP layer is according to the PDCP SN and the HFN of the information configuration target eNB that receives;

Receive the RRC reprovision completion message of UE transmission when target eNB after; The chain of command CC module of target eNB is sent message interface through downlink data; Target Cell Identifier, UE sign and data forwarding configuration information are sent to the PDCP layer of target eNB, so that the PDCP layer sends downlink data according to the information that receives;

After the S-GW on the target eNB has disposed; The chain of command CC module of target eNB is sent message interface through upstream data; Target Cell Identifier, UE sign and data forwarding configuration information are sent to the PDCP layer of target eNB, so that the PDCP layer sends upstream data according to the information that receives;

After target eNB had been sent upstream data, the PDCP layer of target eNB was transmitted through the PDCP designation data and is accomplished message interface, and the chain of command CC module data of notification target eNB is transmitted and accomplished.

6. method according to claim 5; It is characterized in that; The message that said cell-of-origin PDCP SN state obtains the message interface transmission comprises: PDCP SN status request message and PDCP SN status response message; Wherein, The cell of said PDCP SN status request message comprises: the radio bearer number of Target Cell Identifier, terminal iidentification, request and the set of radio bearer sign, the cell of said PDCP SN status response message comprises: the radio bearer number of Target Cell Identifier, terminal iidentification, request, the accepting state of up PDCP service data unit, up-link frame number, up Hyper Frame Number, downlink system frame number and descending Hyper Frame Number.

7. method according to claim 5; It is characterized in that; The message of said up-downgoing data forwarding message interface transmission comprises: up-downgoing data forwarding request message and up-downgoing data forwarding response message; Wherein, The cell of said up-downgoing data forwarding request message comprises: the bitmap of the number of the radio bearer of Target Cell Identifier, terminal iidentification, forwarding type, forwarding and the radio bearer of forwarding, the cell of said up-downgoing data forwarding response message comprises: Target Cell Identifier, terminal iidentification, forwarding type and forwarding result.

8. method according to claim 5; It is characterized in that; It is up-downgoing data forwarding end that said PDCP designation data is transmitted the message of accomplishing the message interface transmission, and the cell of said up-downgoing data forwarding end comprises: the radio bearer sign that Target Cell Identifier, terminal iidentification and forwarding are accomplished.

9. method according to claim 5; It is characterized in that; The message of the data-message interface transmission that said PDCP buffer memory UE inserts comprises: PDCP cache request message and PDCP cache responses message; Wherein, the cell of said PDCP cache request message comprises: Target Cell Identifier, terminal iidentification and buffer memory type, the cell of said PDCP cache responses message comprises: Target Cell Identifier, terminal iidentification, the gentle result that deposits of buffer memory type.

10. method according to claim 5; It is characterized in that; The message of said Target cell PDCP SN state configuration message interface transmission comprises: PDCP SN state configuration request message and PDCP SN state configuration response message; Wherein, The cell of said PDCP SN state configuration request message comprises: the radio bearer number of Target Cell Identifier, terminal iidentification, request, the accepting state of up PDCP service data unit, up-link frame number, up Hyper Frame Number, downlink system frame number and descending Hyper Frame Number, the cell of said PDCP SN state configuration response message comprises: Target Cell Identifier, terminal iidentification, PDCP SN state configuration result.

11. method according to claim 5; It is characterized in that; The message that said downlink data sends the message interface transmission comprises: downlink data sends a request message and downlink data sends response message; Wherein, The cell that said downlink data sends a request message comprises: the bitmap of the number of the radio bearer of Target Cell Identifier, terminal iidentification, transmission types, transmission and the radio bearer of descending transmission, the cell that said downlink data sends response message comprises: Target Cell Identifier, terminal iidentification, transmission types and transmission result.

12. method according to claim 5; It is characterized in that; The message that said upstream data sends the message interface transmission comprises: upstream data sends a request message and upstream data sends response message; Wherein, the cell that said upstream data sends a request message comprises: Target Cell Identifier, terminal iidentification and transmission types, the cell that said upstream data sends response message comprises: Target Cell Identifier, terminal iidentification, transmission types and transmission result.

13. method according to claim 1 is characterized in that, said method also comprises:

14. method according to claim 13; It is characterized in that; The message that said new RNTI obtains the message interface transmission comprises that RNTI obtains request message and RNTI obtains response message; Wherein, the cell that said RNTI obtains request message comprises: Target Cell Identifier, terminal iidentification, terminal access style, terminal access lead index, terminal access channel index, the cell that said RNTI obtains response message comprises: the new RNTI sign at Target Cell Identifier, terminal iidentification and terminal.

15. the switched system in the LTE system is characterized in that, comprising:

The chain of command CC module of source eNB; Be used for after source eNB receives the switching command message of MME transmission; Through up-downgoing data forwarding tunnel configuration messages interface, cell-of-origin sign, UE sign and GTP tunnel configuration information are sent to the GTP layer of source eNB, so that reconfiguring GTP according to the information that receives, the GTP layer transmits the tunnel; After source eNB is intact with the E-RAB data forwarding; Through transmitting tunnel deletion message interface, the tunnel information of cell-of-origin sign, UE sign and GTP tunnel to be deleted is sent to the GTP layer of source eNB, so that the GTP layer is transmitted the tunnel according to the information deletion GTP that receives;

The chain of command CC module of target eNB; Be used for after target eNB obtains new RNTI; Through up-downgoing data forwarding tunnel configuration messages interface, Target Cell Identifier, UE sign and GTP tunnel configuration information are sent to the GTP layer of target eNB, so that reconfiguring GTP according to the information that receives, the GTP layer transmits the tunnel; When target eNB after MME sends handoff notification message; Through S-GW configuration messages interface, Target Cell Identifier, UE sign and GTP tunnel configuration information are sent to the GTP layer of target eNB, so that reconfiguring GTP according to the information that receives, the GTP layer transmits the tunnel; After target eNB has been sent upstream data; Through transmitting tunnel deletion message interface, the tunnel information of Target Cell Identifier, UE sign and GTP tunnel to be deleted is sent to the GTP layer of target eNB, so that the GTP layer is transmitted the tunnel according to the information deletion GTP that receives.

16. system according to claim 15 is characterized in that, the chain of command CC module of said source eNB also is used for; After the up-downgoing data forwarding tunnel of source eNB has disposed; Obtain message interface through cell-of-origin PDCPSN state, the PDCP SN state to the PDCP of source eNB layer acquisition request cell-of-origin is so that the PDCP layer returns the accepting state of up-downgoing PDCP SN and HFN; After source eNB starts the up-downgoing data forwarding; Through up-downgoing data forwarding message interface, cell-of-origin sign, UE sign and data forwarding type are sent to the PDCP layer of source eNB, so that the PDCP layer is transmitted the up-downgoing data according to the information that receives to target eNB;

The chain of command CC module of said target eNB also is used for; When target eNB after MME sends Handover Request Acknowledge message; The data-message interface that inserts through PDCP buffer memory UE sends to the PDCP layer of target eNB with Target Cell Identifier, UE sign and data forwarding configuration information, so that the data of PDCP layer after inserting according to the information cache UE that receives; Receive the MME Status Transfer message of MME transmission when target eNB after; Through Target cell PDCP SN state configuration message interface, Target Cell Identifier, UE sign and PDCP SN state parameter are sent to the PDCP layer of target eNB, so that the PDCP layer is according to the PDCP SN and the HFN of the information configuration target eNB that receives; Receive the RRC reprovision completion message of UE transmission when target eNB after; Send message interface through downlink data, Target Cell Identifier, UE sign and data forwarding configuration information are sent to the PDCP layer of target eNB, so that the PDCP layer sends downlink data according to the information that receives; After the S-GW on the target eNB has disposed; Send message interface through upstream data, Target Cell Identifier, UE sign and data forwarding configuration information are sent to the PDCP layer of target eNB, so that the PDCP layer sends upstream data according to the information that receives;

17. system according to claim 15; It is characterized in that; The chain of command CC module of said target eNB also is used for, and after the RRM of target eNB resource is examined successfully, obtains message interface through new RNTI; The configuration information of Target Cell Identifier, UE sign and channel to be accessed is sent to the MAC layer of target eNB, distribute new RNTI so that the MAC layer is a target eNB.