CN102006640A

CN102006640A - Switching method and device in LTE system

Info

Publication number: CN102006640A
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: Beijing Northen Fiberhome Technologies Co ltd; Wuhan Research Institute of Posts and Telecommunications Co Ltd
Priority date: 2010-12-07
Filing date: 2010-12-07
Publication date: 2011-04-06
Anticipated expiration: 2030-12-07
Also published as: CN102006640B

Abstract

The embodiment of the invention discloses a handover method and device in an LTE system. Among them, through the message interface and signaling interaction between the control plane CC module and the GTP layer, the GTP common tunnel and the forwarding tunnel in the eNB and the target eNB are realized during the handover process. And, after the handover process ends, the common tunnel and the forwarding tunnel are deleted. In this way, data packet loss during the switching process is avoided, and smooth switching is realized. According to the embodiment of the present invention, data packet loss in the switching process can be avoided, ensuring smooth switching.

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, Wideband Code Division Multiple Access (WCDMA)) mainly, by 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 mobile communication system, 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, thereby travelling carriage is communicated with the strongest base station of minimal power and 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 in the eNB switch between the eNB that switches, connects by X2 interface with the eNB that is connected by the S1 interface between switch.

At switching between the eNB in the above-mentioned LTE intra-system handover, according to the existing LTE protocol contents, just on chain of command, realized a kind of taking over seamlessly, and do not provide the specific 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 embodiment of the present application 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 by 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 by 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 by 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 by 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 sends upstream data, the chain of command CC module of target eNB is by 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, be used for after source eNB receives the switching command message of MME transmission, by up-downgoing data forwarding tunnel configuration messages interface, the cell-of-origin is identified, UE sign and GTP tunnel configuration information send 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, by transmitting tunnel deletion message interface, the cell-of-origin is identified, the tunnel information of UE sign and GTP tunnel to be deleted sends 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, by up-downgoing data forwarding tunnel configuration messages interface, with Target Cell Identifier, UE sign and GTP tunnel configuration information send to the GTP layer of target eNB, so that the GTP layer reconfigures GTP according to the information that receives and transmits the tunnel, when target eNB after MME sends handoff notification message, by S-GW configuration messages interface, with Target Cell Identifier, UE sign and GTP tunnel configuration information send to the GTP layer of target eNB, so that the GTP layer reconfigures GTP according to the information that receives and transmits the tunnel, after target eNB sends upstream data, by transmitting tunnel deletion message interface, with Target Cell Identifier, the tunnel information of UE sign and GTP tunnel to be deleted sends to the GTP layer of target eNB, so that the GTP layer is transmitted the tunnel according to the information deletion GTP that receives.

As can be seen from the above-described embodiment, the embodiment of the present application by 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 embodiment of the present application 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, apparently, 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, 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 become apparent more, the embodiment of the present application 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 by 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 described up-downgoing data forwarding tunnel configuration request message comprises: the cell-of-origin sign, terminal iidentification, the tunnel number, the radio bearer sign, tunnel type, the service quality sign corresponding with radio bearer, local tunnel node identification, tunnel, opposite end node identification and tunnel, opposite end IP addresses of nodes, the cell of described up-downgoing data forwarding tunnel configuration response message comprises: the cell-of-origin sign, terminal iidentification, the tunnel number, the radio bearer sign, tunnel type and up-downgoing data forwarding tunnel configuration result.

By 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 by 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 described up-downgoing data forwarding tunnel configuration request message comprises: Target Cell Identifier, terminal iidentification, the tunnel number, the radio bearer sign, tunnel type, the service quality sign corresponding with radio bearer, local tunnel node identification, tunnel, opposite end node identification and tunnel, opposite end IP addresses of nodes, the cell of described up-downgoing data forwarding tunnel configuration response message comprises: Target Cell Identifier, terminal iidentification, the tunnel number, the radio bearer sign, tunnel type and up-downgoing data forwarding tunnel configuration result.

By 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 by 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 described GTP configuration request message comprises: Target Cell Identifier, terminal iidentification, the tunnel number, the radio bearer sign, tunnel type, the service quality sign corresponding with radio bearer, local tunnel node identification, tunnel, opposite end node identification and tunnel, opposite end IP addresses of nodes, the cell of described GTP configuration response message comprises: Target Cell Identifier, terminal iidentification, the tunnel number, the radio bearer sign, tunnel type and S-GW configuration result.

By 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 by 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 described 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.

By 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 sends upstream data, the chain of command CC module of target eNB is by 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 by 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 by 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 finished.

Therefore, preferred, described 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 by 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 described PDCP SN status request message comprises: Target Cell Identifier, terminal iidentification, the radio bearer number of request and the set of radio bearer sign, the cell of described PDCP SN status response message comprises: Target Cell Identifier, terminal iidentification, the radio bearer number of request, the accepting state of up PDCP service data unit, the up-link frame number, up Hyper Frame Number, downlink system frame number and descending Hyper Frame Number.

By 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 by 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 described up-downgoing data forwarding request message comprises: Target Cell Identifier, terminal iidentification, transmit type, the bitmap of the number of the radio bearer of transmitting and the radio bearer of forwarding, the cell of described up-downgoing data forwarding response message comprises: Target Cell Identifier, terminal iidentification, transmit type and transmit the result.

By 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 by the PDCP designation data and is finished 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 finished;

Wherein, the PDCP designation data is transmitted and finished 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 finishing the message interface transmission, and the cell of described up-downgoing data forwarding end comprises: the radio bearer sign that Target Cell Identifier, terminal iidentification and forwarding are finished.

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

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 by 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 described PDCP cache request message comprises: Target Cell Identifier, terminal iidentification and buffer memory type, the cell of described PDCP cache responses message comprises: Target Cell Identifier, terminal iidentification, the gentle result that deposits of buffer memory type.By 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 by 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 described PDCP SN state configuration request message comprises: Target Cell Identifier, terminal iidentification, the radio bearer number of request, the accepting state of up PDCP service data unit, the up-link frame number, up Hyper Frame Number, downlink system frame number and descending Hyper Frame Number, the cell of described PDCP SN state configuration response message comprises: Target Cell Identifier, terminal iidentification, PDCP SN state configuration result.

By 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 the RRC reprovision that target eNB reception UE sends is finished message, the chain of command CC module of target eNB sends message interface by 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 described downlink data sends a request message comprises: Target Cell Identifier, terminal iidentification, transmission types, the bitmap of the number of the radio bearer that sends and the radio bearer of descending transmission, the cell that described downlink data sends response message comprises: Target Cell Identifier, terminal iidentification, transmission types and transmission result.

By 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, 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 sends message interface by 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 described upstream data sends a request message comprises: Target Cell Identifier, terminal iidentification and transmission types, the cell that described upstream data sends response message comprises: Target Cell Identifier, terminal iidentification, transmission types and transmission result.

By 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, 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 by the Signalling exchange between chain of command CC module and the MAC layer.

Therefore, preferred, described 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 by 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 described RNTI obtains request message comprises: Target Cell Identifier, terminal iidentification, the terminal access style, terminal access lead index, terminal access channel index, the cell that described RNTI obtains response message comprises: Target Cell Identifier, the new RNTI sign of terminal iidentification and terminal.

By 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.

As can be seen from the above-described embodiment, the embodiment of the present application is on LTE agreement basis, by 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, by 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 finished, and is obtained new RNTI.Realized taking over seamlessly.

Embodiment two

Below to switch to example between the eNB that connects by the S1 interface, illustrate handoff procedure and after the finishing switching from source eNB side, 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 specific implementation process 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 by 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 sends up-downgoing to the GTP layer and transmits the tunnel configuration request message;

Wherein, the CC module of source eNB sends this message by 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 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 by 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 sent up-downgoing data forwarding request message to the PDCP layer;

Wherein, the CC module of source eNB sends to message by 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 finishes message;

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

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 finished, S-GW sent End Marker message to source eNB;

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

Wherein, the PDCP layer of source eNB is finished message interface by the forwarding of PDCP designation data and is sent this message.

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

Step 230: after source eNB was intact with the E-RAB data forwarding, the chain of command CC module of source eNB 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 sends this message by 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 finished.

Embodiment three

Below to switch to example between the eNB that connects by the S1 interface, illustrate 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 specific implementation process 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 by 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 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 by 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 sent up-downgoing to the GTP of target eNB layer and transmits the tunnel configuration request message;

Wherein, the CC module of target eNB is transmitted the tunnel configuration message interface by 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 sends 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 sends 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 by 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 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 sends the PDCP SN state configuration message of Target cell to the PDCP of target eNB layer;

Wherein, the CC module of target eNB is by the PDCP SN state configuration message of the PDCP SN state configuration message interface transmission Target cell of Target cell, and this message comprises 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 finishes message;

Step 324: after the RRC reprovision that target eNB reception UE sends was finished message, the CC module of target eNB sent downlink data to the PDCP of target eNB layer and sends a request message;

Wherein, the CC module of target eNB sends message interface transmission downlink data by downlink data and sends 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 transmission response message;

Step 326: target eNB sends downlink data;

Step 327: target eNB sends switching notice (Handover Notify) message to MME, and the indication switching is finished;

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

Wherein, the CC module of target eNB sends the S-GW configuration request message by 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 S-GW configuration response message;

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

Wherein, the chain of command CC module of target eNB sends this message by 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 S-GW configuration response message;

Step 332: target eNB sends upstream data;

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

Wherein, the PDCP layer of target eNB is finished message interface by the forwarding of PDCP designation data and is sent this message.

Step 334: after target eNB sent upstream data, the CC module of target eNB sent deletion to the GTP of target eNB layer and transmits 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 sends this message by 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 finished, S-GW sent End Marker message to source eNB;

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

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

Wherein, the PDCP layer of target eNB is finished message interface by the forwarding of PDCP designation data and is sent this message, and the chain of command CC module data of notification target eNB is transmitted and finished.

Embodiment four

Corresponding with the changing method in a kind of LTE system, the embodiment of the present application 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, 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, by up-downgoing data forwarding tunnel configuration messages interface, the cell-of-origin is identified, UE sign and GTP tunnel configuration information send 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, by transmitting tunnel deletion message interface, the cell-of-origin is identified, the tunnel information of UE sign and GTP tunnel to be deleted sends 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, by up-downgoing data forwarding tunnel configuration messages interface, with Target Cell Identifier, UE sign and GTP tunnel configuration information send to the GTP layer of target eNB, so that the GTP layer reconfigures GTP according to the information that receives and transmits the tunnel, when target eNB after MME sends handoff notification message, by S-GW configuration messages interface, with Target Cell Identifier, UE sign and GTP tunnel configuration information send to the GTP layer of target eNB, so that the GTP layer reconfigures GTP according to the information that receives and transmits the tunnel, after target eNB sends upstream data, by transmitting tunnel deletion message interface, with Target Cell Identifier, the tunnel information of UE sign and GTP tunnel to be deleted sends 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 by 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 finished.

Preferably, the chain of command CC module of described source eNB also is used for, after the up-downgoing data forwarding tunnel of source eNB has disposed, obtain message interface by 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, by up-downgoing data forwarding message interface, the cell-of-origin is identified, UE sign and data forwarding type send 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 described target eNB also is used for, after target eNB obtains new RNTI, transmit the tunnel configuration message interface by up-downgoing, with Target Cell Identifier, UE sign and tunnel configuration information send 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, data-message interface by PDCP buffer memory UE access, with Target Cell Identifier, UE sign and data forwarding configuration information send to the PDCP layer of target eNB, so that the data after the PDCP layer inserts according to the information cache UE that receives, receive the MME Status Transfer message of MME transmission when target eNB after, by Target cell PDCP SN state configuration message interface, with Target Cell Identifier, UE sign and PDCP SN state parameter send 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, after the RRC reprovision that target eNB reception UE sends is finished message, send message interface by downlink data, with Target Cell Identifier, UE sign and data forwarding configuration information send 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 by upstream data, with Target Cell Identifier, UE sign and data forwarding configuration information send to the PDCP layer of target eNB, so that the PDCP layer sends upstream data according to the information that receives;

Then, described 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 by the PDCP designation data and finish message interface, End Market message is sent to target eNB, and the forwarding of the chain of command CC module data of notification source eNB is finished;

The PDCP layer of target eNB is used for after target eNB sends upstream data, transmits by the PDCP designation data and finishes message interface, and the chain of command CC module data of notification target eNB is transmitted and finished.

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 by the Signalling exchange between chain of command CC module and the MAC layer.

Further preferred, the chain of command CC module of described target eNB also is used for, after the RRM of target eNB resource is examined successfully, obtain message interface by 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 finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process as 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 is described in detail, used specific embodiment herein 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 all can change in specific embodiments and applications, in sum, this description should not be construed as the restriction to the application.

Claims

1. A handover method in an LTE system, characterized in that, comprising:

After the source eNB receives the handover command message sent by the MME, the control plane CC module of the source eNB sends the source cell identifier, UE identifier and GTP tunnel configuration information to the GTP layer of the source eNB through the uplink and downlink data forwarding tunnel configuration message interface, So that the GTP layer reconfigures the GTP forwarding tunnel according to the received information;

After the target eNB obtains the new RNTI, the control plane CC module of the target eNB sends the target cell ID, UE ID, and GTP tunnel configuration information to the GTP layer of the target eNB through the uplink and downlink data forwarding tunnel configuration message interface, so that the GTP layer can receive information to reconfigure the GTP forwarding tunnel;

After the target eNB sends the handover notification message to the MME, the control plane CC module of the target eNB sends the target cell identity, UE identity, and GTP tunnel configuration information to the GTP layer of the target eNB through the S-GW configuration message interface, so that the GTP layer according to The received information reconfigures the GTP forwarding tunnel;

After the source eNB forwards the E-RAB data, the control plane CC module of the source eNB sends the source cell ID, UE ID, and the tunnel information of the GTP tunnel to be deleted to the GTP layer of the source eNB through the forwarding tunnel deletion message interface, So that the GTP layer deletes the GTP forwarding tunnel according to the received information;

After the target eNB sends the uplink data, the control plane CC module of the target eNB sends the target cell ID, UE ID, and the tunnel information of the GTP tunnel to be deleted to the GTP layer of the target eNB through the forwarding tunnel deletion message interface, so that the GTP The layer deletes the GTP forwarding tunnel based on the information received.

2. The method according to claim 1, wherein the message transmitted by the S-GW configuration message interface includes: a GTP configuration request message and a GTP configuration corresponding message, wherein the information elements of the GTP configuration request message include : Target cell ID, terminal ID, number of tunnels, radio bearer ID, tunnel type, QoS ID corresponding to the radio bearer, local tunnel node ID, peer tunnel node ID, and IP address of the peer tunnel node, the GTP The information elements of the configuration response message include: target cell identifier, terminal identifier, number of tunnels, radio bearer identifier, tunnel type and S-GW configuration result.

3. The method according to claim 1, wherein the message transmitted by the uplink and downlink data forwarding tunnel configuration message interface includes: uplink and downlink data forwarding tunnel configuration request message and uplink and downlink data forwarding tunnel configuration response message, wherein, The information elements of the uplink and downlink data forwarding tunnel configuration request message include: target cell identifier, terminal identifier, number of tunnels, radio bearer identifier, tunnel type, quality of service identifier corresponding to the radio bearer, local tunnel node identifier, peer tunnel Node identifier and the IP address of the peer tunnel node, the information elements of the uplink and downlink data forwarding tunnel configuration response message include: target cell identifier, terminal identifier, number of tunnels, radio bearer identifier, tunnel type and uplink and downlink data forwarding tunnel configuration result.

4. The method according to claim 1, wherein the message transmitted by the forwarding tunnel deletion message interface is a GTP deletion message, and the information element of the GTP deletion message includes: target cell identification, terminal identification, tunnel number , radio bearer ID, tunnel type, local tunnel node ID, and peer tunnel node ID.

5. The method according to claim 1, wherein the method further comprises:

After the uplink and downlink data forwarding tunnel of the source eNB is configured, the CC module of the control plane of the source eNB requests the PDCP layer of the source eNB to obtain the PDCP SN status of the source cell through the source cell PDCP SN state acquisition message interface, so that the PDCP layer returns the uplink and downlink Receive status of PDCP SN and HFN;

After the source eNB starts uplink and downlink data forwarding, the CC module of the control plane of the source eNB sends the source cell identity, UE identity and data forwarding type to the PDCP layer of the source eNB through the uplink and downlink data forwarding message interface, so that the PDCP layer The information forwards the uplink and downlink data to the target eNB;

After the source eNB forwards the E-RAB data, the PDCP layer of the source eNB indicates the data forwarding completion message interface through the PDCP, sends the End Market message to the target eNB, and notifies the control plane CC module of the source eNB that the data forwarding is completed;

After the target eNB sends the Handover Request Acknowledge message to the MME, the control plane CC module of the target eNB caches the data message interface accessed by the UE through the PDCP, and sends the target cell identity, UE identity and data forwarding configuration information to the PDCP layer of the target eNB, So that the PDCP layer caches the data after the UE accesses according to the received information;

After the target eNB receives the MME Status Transfer message sent by the MME, the control plane CC module of the target eNB sends the target cell ID, UE ID, and PDCP SN status parameters to the PDCP layer of the target eNB through the target cell PDCP SN status configuration message interface , so that the PDCP layer configures the PDCP SN and HFN of the target eNB according to the received information;

After the target eNB receives the RRC reconfiguration complete message sent by the UE, the control plane CC module of the target eNB sends the target cell identity, UE identity, and data forwarding configuration information to the PDCP layer of the target eNB through the downlink data sending message interface, so that PDCP The layer sends downlink data according to the received information;

When the S-GW on the target eNB is configured, the CC module of the control plane of the target eNB sends the target cell ID, UE ID and data forwarding configuration information to the PDCP layer of the target eNB through the uplink data sending message interface, so that the PDCP layer according to The received information sends uplink data;

After the target eNB finishes sending the uplink data, the PDCP layer of the target eNB informs the CC module of the control plane of the target eNB that the data forwarding is completed through the PDCP instruction message interface.

6. The method according to claim 5, wherein the message transmitted by the PDCP SN state acquisition message interface of the source cell comprises: a PDCP SN state request message and a PDCP SN state response message, wherein the PDCP SN state request The information element of the message includes: the target cell identifier, the terminal identifier, the number of requested radio bearers and the set of radio bearer identifiers, and the information element of the PDCP SN status response message includes: the target cell identifier, the terminal identifier, and the requested number of radio bearers , the receiving state of the uplink PDCP service data unit, the uplink system frame number, the uplink superframe number, the downlink system frame number and the downlink superframe number.

7. The method according to claim 5, wherein the message transmitted by the uplink and downlink data forwarding message interface includes: uplink and downlink data forwarding request message and uplink and downlink data forwarding response message, wherein the uplink and downlink data forwarding The information element of the request message includes: target cell identifier, terminal identifier, forwarding type, the number of forwarded radio bearers and the bitmap of forwarded radio bearers, and the information element of the uplink and downlink data forwarding response message includes: target cell identifier, Terminal ID, forwarding type and forwarding result.

8. The method according to claim 5, wherein the message transmitted by the interface of the PDCP instruction data forwarding completion message is an uplink and downlink data forwarding end message, and the information elements of the uplink and downlink data forwarding end message include: target cell ID, terminal ID, and radio bearer ID for which forwarding is completed.

9. The method according to claim 5, wherein the PDCP caches the message transmitted by the data message interface accessed by the UE comprising: a PDCP cache request message and a PDCP cache response message, wherein the PDCP cache request message contains: The information element includes: target cell identifier, terminal identifier and cache type, and the information element of the PDCP cache response message includes: target cell identifier, terminal identifier, cache type and cache result.

10. The method according to claim 5, wherein the message transmitted by the PDCP SN state configuration message interface of the target cell comprises: a PDCP SN state configuration request message and a PDCP SN state configuration response message, wherein the PDCP SN The information elements of the status configuration request message include: target cell identifier, terminal identifier, number of requested radio bearers, reception status of uplink PDCP service data unit, uplink system frame number, uplink superframe number, downlink system frame number and downlink superframe No., the information element of the PDCP SN status configuration response message includes: target cell identifier, terminal identifier, and PDCP SN status configuration result.

11. The method according to claim 5, wherein the message transmitted by the downlink data sending message interface includes: a downlink data sending request message and a downlink data sending response message, wherein the information of the downlink data sending request message The element includes: target cell identifier, terminal identifier, transmission type, the number of transmitted radio bearers, and the bitmap of downlink transmitted radio bearers. The information element of the downlink data transmission response message includes: target cell identifier, terminal identifier, transmission Type and send the result.

12. The method according to claim 5, wherein the message transmitted by the uplink data sending message interface includes: an uplink data sending request message and an uplink data sending response message, wherein the information of the uplink data sending request message The element includes: target cell identifier, terminal identifier and sending type, and the information element of the uplink data sending response message includes: target cell identifier, terminal identifier, sending type and sending result.

13. The method of claim 1, further comprising:

After the RRM resource audit of the target eNB is successful, the CC module of the control plane of the target eNB will obtain the message interface through the new RNTI, and send the configuration information of the target cell ID, UE ID, and channel to be accessed to the MAC layer of the target eNB, so that the MAC layer Allocate a new RNTI for the target eNB.

14. The method according to claim 13, wherein the message transmitted by the new RNTI acquisition message interface includes an RNTI acquisition request message and an RNTI acquisition response message, wherein the information elements of the RNTI acquisition request message include: target Cell ID, terminal ID, terminal access type, terminal access preamble index, terminal access channel index, the information elements of the RNTI acquisition response message include: target cell ID, terminal ID and new RNTI ID of the terminal.

15. A handover system in an LTE system, comprising:

The control plane CC module of the source eNB is used to send the source cell identity, UE identity and GTP tunnel configuration information to the source eNB through the uplink and downlink data forwarding tunnel configuration message interface after the source eNB receives the handover command message sent by the MME GTP layer, so that the GTP layer reconfigures the GTP forwarding tunnel according to the received information. After the source eNB forwards the E-RAB data, it deletes the message interface through the forwarding tunnel, and transfers the source cell identity, UE identity, and the tunnel of the GTP tunnel to be deleted. The information is sent to the GTP layer of the source eNB, so that the GTP layer deletes the GTP forwarding tunnel according to the received information;

The control plane CC module of the target eNB is used to send the target cell identity, UE identity and GTP tunnel configuration information to the GTP layer of the target eNB through the uplink and downlink data forwarding tunnel configuration message interface after the target eNB obtains the new RNTI, so that the GTP The layer reconfigures the GTP forwarding tunnel according to the received information. After the target eNB sends a handover notification message to the MME, it sends the target cell ID, UE ID, and GTP tunnel configuration information to the GTP layer of the target eNB through the S-GW configuration message interface. In order for the GTP layer to reconfigure the GTP forwarding tunnel according to the received information, after the target eNB sends the uplink data, it sends the target cell ID, UE ID and tunnel information of the GTP tunnel to be deleted to the target eNB through the forwarding tunnel deletion message interface The GTP layer, so that the GTP layer deletes the GTP forwarding tunnel according to the received information.

16. The device according to claim 15, wherein the control plane CC module of the source eNB is also used to obtain a message interface through the PDCPSN state of the source cell after the uplink and downlink data forwarding tunnel of the source eNB is configured, Request to the PDCP layer of the source eNB to obtain the PDCP SN status of the source cell, so that the PDCP layer returns the receiving status of the uplink and downlink PDCP SN and HFN. The ID, UE ID and data forwarding type are sent to the PDCP layer of the source eNB, so that the PDCP layer forwards the uplink and downlink data to the target eNB according to the received information;

The control plane CC module of the target eNB is also used to send the target cell identity, UE identity and data forwarding configuration information to The PDCP layer of the target eNB, so that the PDCP layer caches the data after UE access according to the received information. After the target eNB receives the MME Status Transfer message sent by the MME, it uses the PDCP SN status configuration message interface of the target cell to set the target cell ID, The UE ID and PDCP SN status parameters are sent to the PDCP layer of the target eNB, so that the PDCP layer configures the PDCP SN and HFN of the target eNB according to the received information. When the target eNB receives the RRC reconfiguration complete message sent by the UE, it sends the message through downlink data Interface to send the target cell ID, UE ID, and data forwarding configuration information to the PDCP layer of the target eNB, so that the PDCP layer can send downlink data according to the received information. When the S-GW on the target eNB is configured, the message is sent through the uplink data The interface sends the target cell identity, UE identity and data forwarding configuration information to the PDCP layer of the target eNB, so that the PDCP layer sends uplink data according to the received information;

Then, the system further includes: the PDCP layer of the source eNB, which is used to send the End Market message to the target eNB through the PDCP instruction data forwarding completion message interface after the source eNB has forwarded the E-RAB data, and notify the source eNB The data forwarding of the control plane CC module is completed;

The PDCP layer of the target eNB is used to notify the CC module of the control plane of the target eNB that the data forwarding is completed through the PDCP indication message interface after the target eNB has sent the uplink data.

17. The device according to claim 15, wherein the control plane CC module of the target eNB is further configured to obtain a message interface through a new RNTI after the RRM resource audit of the target eNB is successful, and obtain the target cell identifier, The UE identity and the configuration information of the channel to be accessed are sent to the MAC layer of the target eNB, so that the MAC layer allocates a new RNTI for the target eNB.