CN1933664A

CN1933664A - Method for supporting user equipment transferability in LTE system

Info

Publication number: CN1933664A
Application number: CNA2006100795080A
Authority: CN
Inventors: 许丽香; 李小强
Original assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Current assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Priority date: 2005-09-14
Filing date: 2006-04-25
Publication date: 2007-03-21

Abstract

A method for supporting movement of user device in LTE system includes deciding to switch over UE to cell of another destination ENB by source ENB according to measurement report received from UE and sending resource request message to destination ENB, sending resource report message to source ENB by destination ENB and sending distributed resource to source ENB, sending UE logon message to EGGSN for making logon by destination ENB, sending switch-over command to UE by source ENB and receiving switch-over finish message from UE by destination ENB.

Description

Method for supporting user equipment transferability in the LTE system

Technical field

The present invention relates to method for supporting user equipment transferability in mobile communication system Long Term Evolution (hereinafter to be referred as the LTE) system that third generation partner plan (hereinafter to be referred as 3GPP) proposes.

Background technology

Existing third generation partner plan (hereinafter to be referred as 3GPP) structure as shown in Figure 1.Be description below to Fig. 1 3GPP system configuration.

101 subscriber equipmenies (hereinafter to be referred as UE) are the terminal equipments that is used for receiving data.102 NodeB are nodes of being responsible for (being called for short RNS) wireless receipts/send out in the RNS.103 control radio network controllers (hereinafter to be referred as CRNC) are the radio network controllers of directly controlling NodeB.Interface between RNC and the UE is called air interface.104 service wireless network controllers (hereinafter to be referred as SRNC) are the radio network controllers (hereinafter to be referred as RNC) of control beared information, as Radio Resource control (hereinafter to be referred as RRC) state.105 gateway general packet radio service (is GPRS hereinafter to be referred as GPRS) support nodes (is GGSN hereinafter to be referred as Gateway GPRS Support Node) and 106 Serving GPRS Support Nodes (hereinafter to be referred as SGSN) provide route for the transmission of data.Interface between SGSN and the RNC is the Iu interface.107 E-PDN are outside public data networks, and data source is provided.

After existing GGSN receives user data,, send data to SGSN, after same SGSN receives data, data are sent to RNC by GTP-U by GTP-U through being before the corresponding professional user plane of setting up of this user.User data is introduced in conjunction with Fig. 2 in detail in the processing of RNC and Node B.

Fig. 2 is existing radio interface protocol architecture.Existing air interface is divided into three layers: 205 physical (L1)s, data link layer (L2) and network layer (L3).L2 is divided into the sublayer: 204 medium access controls (hereinafter to be referred as MAC), 203 Radio Links controls (hereinafter to be referred as RLC), 201 grouped data Convergence Sublayers (hereinafter to be referred as PDCP) and 202 broadcast group broadcasts controls (hereinafter to be referred as BMC).202BMC is only just useful when handling broadcasting service, can not describe in detail here.Ellipse circle among the figure is Service Access point (hereinafter to be referred as SAP), is used for communication end to end between the sublayer.SAP between 204MAC and the physical layer is a transmission channel.SAP between RLC and the MAC is a logic channel.PDCP and BMC insert by PDCP and BMC SAP respectively.The business that L2 provides is called radio bearer (hereinafter to be referred as RB).206 Radio Resources controls (hereinafter to be referred as RRC) can be configured PDCP, BMC, RLC, MAC and physical layer, are the functions of control plane.PDCP and BMC are the function of user plane.RLC is the same in the function of control plane and user plane.

Behind the user data arrival RNC of the next packet domain of SGSN, at first data are carried out head compression (behavior of going up decompresses) by 201 PDCP.The another one function of PDCP is to guarantee the not service wireless network controller of obliterated data (hereinafter to be referred as SRNC) reorientation.Handle by 203 RLC entities then.The function of RLC is framing (cut apart and merge), repetitive requests (hereinafter to be referred as ARQ) and encryption automatically.The 204MAC layer is divided into different network entities, is not described in detail here.The function of MAC layer is the mapping of hybrid ARQ (hereinafter to be referred as HARQ), access control at random, transport format combination selection, UE identification and logic channel and transmission channel.The function of 205 physical layers is to send and receive radio frames, power control etc.The function of physical layer realizes at Node B.Data are that the Frame Protocol (hereinafter to be referred as FP) by transmission channel transmits between RNC and Node B.

In existing systems, UE by soft handover, can guarantee not losing of data when (not have reorientation) between NodeB or between the RNC mobile.Because strict synchronized relation is arranged, network is surveyed and UE surveys when activating new link, and just the old link of deexcitation (deactive) guarantees seamless moving.

Fig. 3 is existing SRNS repositioning process.Be detailed description below to each step in the flow process.

The SRNS repositioning process is carried out in 301 source RNC decision.302 source RNC send " reorientation demand " and give original SGSN.Comprise information elements such as source sign, purpose sign in the message.After SGSN originally receives this message, identify reorientation in the same SGSN or the reorientation between the SGSN from purpose.If the reorientation between the SGSN, SGSN originally initiates the reorientation resource allocation process.303 original SGSN send " forwarding re-positioning request " and give new SGSN.Transmitting re-positioning request only just uses during reorientation between SGSN.304 new SGSN send " re-positioning request " and give Target RNC, set up RAB (hereinafter to be referred as RAB) between Target RNC and new SGSN.After the resource of RAB needs comprised that the resource of user plane becomes the distribution of work, Target RNC sent " re-positioning request affirmation " message and gives new SGSN.The RAB of each foundation comprises message transmission layer address (the purpose RNC address of user data) and Iu transmission relation (giving the terminal sign of down going channel (hereinafter to be referred as TEID) of user data).305 distribute data transmission resources and new SGSN when being ready to the SRNS reorientation as purpose RNC and new SGSN, and new SGSN sends " forwarding relocation response " and gives original SGSN.This message indication purpose RNC is ready to receive the descending PDU that transmits from source SRNC.The reorientation resource allocation process completes successfully.Transmitting relocation response only just uses in the repositioning process between SGSN.After SGSN originally received this message, 306 send " reorientation order " message gave source RNC.Comprise the RAB that RAB that needs discharge and needs are transmitted data in the message, SGSN is based on Qos and needing determines whether the forwarding data.The RAB information that needs to transmit data should comprise RAB sign, transport layer address and Iu transmission relation.What transport layer address and Iu transmission relation and purpose RNC sent to new SGSN by " re-positioning request affirmation " message is the same.These parameters are used for downlink network protocol Data Unit (hereinafter to be referred as N-PDU) forwarding by the Iu interface from source SRNC to purpose RNC.Transmit and only be used for descending user data.SRNC is ready to the forwarding of down user data at this moment.307 transmit the RAB of data based on the needs of Qos decision, and source RNC begins copy data and sends to Target RNC by the Iu interface.Use the radio bearer do not lose PDCP (lossPDCP) for each, GTP-PDU (but corresponding PDCP-PDUs sent also do not obtain confirming) is replicated and sends to Target RNC by network protocol layer (hereinafter to be referred as the IP layer).Source RNC continues to send descending copy data and receives upstream data.Before the role of Serving RNC was replaced by purpose RNC, when descending user plane data begins to arrive purpose RNC, purpose RNC was according to the Qos attribute, can buffer memory or abandon the descending GTP-PDUs of arrival.

From the step of step 7 beginning, not necessarily reflected the order of incident.For example, source RNC may begin to transmit data and 308 while 307 and send " reorientation submission " message, unless 307 trigger 308.Target RNC may send " reorientation detection " and " UE mobile message " simultaneously, when therefore 310 purpose RNC may receive " affirmation of UE mobile message ", 307 data forwarding are still being carried out 308 source RNC transmissions " reorientation submission " to Target RNC, this process is given Target RNC in order to transmission SRNS context, and the role of SRNS is from source RNC converting into target RNC.The SRNS contextual information of relevant RAB all is sent out, and comprises the GTP-PDU sequence number that the up-downgoing next one will be sent out, and the next PDCP sequence number that transmits and receive data to UE of being used for.For not requiring that order sends PDP Context, the GTP-PDUs that the next one is sent out is not used at purpose RNC.The PDCP sequence number is only just sent by source RNC when using the radio bearer of not losing PDCP.

309 when Target RNC is received the triggering message of reorientation execution, and Target RNC sends " reorientation detection " message and gives new SGSN.Afterwards, Target RNC begins to exercise the role of service wireless network controller (hereinafter to be referred as SRNC).310UE and the mobile relevant information of Target RNC exchange, the sign of for example new SRNC, the sign of the band of position and uplink user data etc. exchange between UE and Target RNC.

After 311 target SRNC receive " affirmation of UTRAN mobile message " message, initiate the reorientation complete process, purpose RNC sends " reorientation is finished " message and gives new SGSN.The reorientation complete process is used to notify finishing of CN SRNS repositioning process.If repositioning process is the process between the different SGSN, 312 new SGSN send finishing of the original SGSNSRNS repositioning process of " transmitting reorientation finishes " message informing.SGSN originally sends response message and " transmits reorientation and finish affirmation " message to new SGSN.After receiving that message is finished in reorientation, SGSN switches to purpose RNC to user plane from source SRNC.If 311 SRNS reorientations are the SRNS reorientations between the different SGSN, after new SGSN receives " reorientation is finished " message, " upgrade the PDP Context request information and give corresponding GGSN, GGSN update packet data protocol (hereinafter to be referred as PDP) context also returns " upgrading the PDP Context response " message in new SGSN transmission.

SGSN receives that 313 old SGSN sent the Iu release command message to source SRNC when reorientation was finished repositioning process between message or the different SGSN and received that transmitting reorientation finishes message.Iu between source of release RNC and the source SGSN connects and user resources.

If it is original that 314 new Routing Areas represent that (hereinafter to be referred as RAI) is different from, UE initiates the route position updating process.

C1, C2 and C3 carry out the application process (being called for short CAMEL) of the propertyization that strengthens the mobile network, ignore detailed technology contents here.

Here be to be that example is told about data forwarding in the repositioning process with the SRNS repositioning process that UE does not relate to, for the direct-cut operation and the SRNS repositioning process that merge, air interface has some differences, and the contextual forwarding of SRNS is undertaken by the Iu interface, rather than by the Iur interface.But data forwarding is the same.

Existing 3GPP system configuration exists upgradability poor, and call set-up time is long, many shortcomings such as system configuration complexity, so 3GPP standardization body is carrying out the standardization effort of LTE.At the demand of LTE, each company has all proposed the LTE system configuration of wishing, wherein a kind of LTE system configuration of proposition as shown in Figure 4.As the function of original RNC and NodeB are synthesized a network entity (calling ENB 402 here), the function of SGSN and GGSN lumps together becomes a network entity (being called EGGSN 403 here).Wherein packet data compression protocol (hereinafter to be referred as PDCP) is the function of original RNC, also can be placed on EGGSN in LTE.Come simplified system by reducing network node like this, reduce the time delay of system.Wherein 401 UE and 404 E-PDN respectively with Fig. 1 in 101 and 107 identical.

In the LTE system, a lot of companies propose RLC and MAC function are simplified, and for example RLC and MAC have the function of cutting apart and contacting, and only reservation is a, and all functions that propose RLC and MAC can be combined in a layer, just do not have rlc layer.

In the new LTE system configuration that proposes, PDCP is positioned at EGGSN, and RLC (perhaps MAC refers to the user plane two-layer protocol that data is carried out segmentation and polyphone here) is positioned at ENB.When UE was mobile between two ENB, a part of RLC SDU had been cut apart PDU, and how to transmit these data (PDU, SDU) between two ENB is the existing protocol open question.

In the present invention for convenience, we still continue to use the notion of RLC, refer to be positioned at ENB, and at first the two-layer protocol that will cut apart and merge data can be RLC, also can be the part of MAC.If RLC and MAC lump together in the future, the function of the MAC layer that just is meant is as MACPDU, MAC SDU.This will not influence main contents of the present invention.

Summary of the invention

The purpose of this invention is to provide a kind of method of between two ENB, passing through transmitting RLC PDU and RLCSDU,, save system resource guaranteeing to have improved efficiency of transmission under the situation that data are not lost.

For achieving the above object, support the UE mobility method in a kind of LTE system, wherein, UE moves between two ENB, comprises step:

Source ENB will switch to the sub-district of another one purpose ENB according to " measurement report " decision UE that receives from UE, and sends " resource request " message to purpose ENB;

Purpose ENB sends " resource response " message and gives source ENB, and the resource of distributing is sent to source ENB;

Purpose ENB sends " UP registration " message and registers to EGGSN;

Source ENB sends " switching command " and gives UE.

The present invention guaranteed UE between two ENB when mobile data do not lose, and solved the forwarding problems of data between two ENB.The present invention is simple, reliable, efficient.

Description of drawings

Fig. 1 is existing 3GPP system configuration;

Fig. 2 is existing radio interface protocol architecture;

Fig. 3 is existing SRNS repositioning process;

Fig. 4 is a kind of LTE system configuration of proposition;

Fig. 5 is that UE is in connection mode, the process (method one) that moves between two ENB

Fig. 6 is that UE is in connection mode, moves (method one), the motion flow of source ENB between two ENB;

Fig. 7 is that UE is in connection mode, moves (method one), the motion flow of purpose ENB between two ENB;

Fig. 8 is that UE is in connection mode, moves (method one), the motion flow of EGGSN between two ENB;

Fig. 9 is that UE is in connection mode, moves (method one), the motion flow of UE between two ENB;

Figure 10 is that UE is in connection mode, the process (method two) that moves between two ENB;

Figure 11 is that UE is in connection mode, moves (method two), the motion flow of purpose ENB between two ENB;

Figure 12 is that UE is in connection mode, moves (method two), the motion flow of source ENB between two ENB;

Figure 13 is that UE is in connection mode, moves (method two), the motion flow of EGGSN between two ENB;

Figure 14 is that UE is in connection mode, moves (method two), the motion flow of UE between two ENB;

Figure 15 is that UE is in connection mode, the process (method three) that moves between two ENB;

Figure 16 is that UE is in connection mode, moves (method two), the motion flow of purpose ENB between two ENB.

Embodiment

LTE system configuration with Fig. 4 among the present invention is that example is told about the method that UE moves between two ENB, claims that here the interface between ENB and the UE is air interface (hereinafter to be referred as Uu), the interface of promptly original RNC and UE.Interface between ENB and the EGGSN is Iu+ interface (originally the interface between RNC and the SGSN is the Iu interface).Interface between the ENB is the Iur interface.The retransmission method that focuses on the Iur interface data of the present invention, if the system configuration of LTE changes in the future, for example EGGSN is divided into control plane and two network entities of user plane, this invention is same to be suitable for.

Fig. 5 is in connection mode for UE, moves to the method one of another one ENB from an ENB.The feature of this method is before UE really switches to new sub-district, and a process of preparing Radio Resource is in advance arranged.

Based on the measurement of source ENB configuration, 501 UE send " measurement report " message and give source ENB, the result who measures, give source ENB as the report information of neighbor cell.According to the measurement result of UE report, if source ENB determines UE is moved to the sub-district of another one ENB (purpose ENB), 502 source ENB send " resource request " message and give purpose ENB.Sign, UE sign, the UE that comprises the purpose sub-district in the message needs the IP address of the Qos information of access service, EGGSN that current UE connects, the tunnel end that EGGSN distributes to identify (hereinafter to be referred as TEID) (being used for the up TEID between source ENB and the EGGSN), protection algorithm integrallty and password, encipherment protection algorithm and password.Wherein source RNC also can be being that UE assigned radio resource situation is told purpose RNC by resource request at source RNC, rather than directly use UE professional Qos directly to tell purpose RNC.Purpose ENB receives resource request message; ENB is according to the parameter in the request message (for example Qos or radio resource configuration parameters) resource allocation; if requested resource can be distributed; ENB creates the context of this UE; the relevant information of this UE is preserved the user plane sign (as TEID) of distributing as cell ID, UE sign, EGGSN IP address, EGGSN, protection algorithm integrallty and password, cryptographic algorithm and password.The user plane sign (for example TEID) of purpose ENB distributing user Iur data forwarding.503 ENB send " resource response " message and give source ENB, and the resource that purpose ENB is distributed sends to source ENB, and purpose ENB assigned radio resource can send to source ENB by RRC container (container).Comprise the user plane sign (for example TEID) that is used for data forwarding that purpose ENB distributes simultaneously in " resource response " message.If purpose ENB can not distribute corresponding resource, purpose ENB sends the response message of failure to source ENB, comprises the information element reason in the response message of failure, informs that by cause value the reason of source ENB failure does not for example have Radio Resource.Purpose ENB can receive up data this moment.If the success of purpose ENB Resources allocation, 504 purpose ENB send " UP registration " message and register to EGGSN.Comprise downlink user plane mark such as TEID, UE sign and new ENB IP address that new ENB distributes in the message.At this moment EGGSN can begin to send data to purpose ENB.This message also can send to EGGSN after receiving 508 " switching is finished " message of coming from UE.

Source ENB receives the resource response message of success, preserves the user plane sign as TEID.505 source ENB send " switching command " and give UE, notify UE the new Radio Resource that purpose ENB distributes by this message.Source ENB also can determine an activationary time, sends to UE by " switching command ", and network and UE switch to new sub-district at activationary time like this.506a source ENB begins RLC SDU is sent to purpose ENB by the Iur user plane of having set up.But the RLC SDU here is meant does not have the RLC of segmentation SDU, or does not have the RLC SDU of segmentation and pass through segmentation the RLC SDU that all segmentations are not all confirmed or sent.507 source ENB send " RLC context transfer " message and give purpose ENB, by this message each are not obtained confirming that the RLC PDU of (NACK) and corresponding series number send to purpose ENB.If comprise those among the RLCSDU of above-mentioned forwarding, do not comprise SDU of correspondence here among the RLC PDU that does not then obtain confirming and all do not obtain those PDU of confirming through the RLCSDU that segmentations but all segmentations are not all confirmed or sent.Also can comprise in " RLC context transfer " message and be used for Next RLC PDU sequence number (SN that the next one will be used during RLC SDU framing).The data length (hereinafter to be referred as LI) that can also comprise segmentation among first RLC SDU of forwarding in the RLC context.This information element is optionally, if first RLC SDU is complete, does not all have segmentation, and then LI does not exist.Also comprise the GTP sequence number that the GTP PDU of forwarding begins and the GTP sequence number of end in the RLC context transfer message, by these two information elements, purpose ENB can abandon portion to the data of receiving from source ENB and EGGSN simultaneously.The RLC contextual information also comprises the contextual information of other automatic repetitive requests (hereinafter to be referred as ARQ).Wherein 505,506a and 507 do not have absolute sequencing, for example source ENB can begin data forwarding earlier, sends " switching command " simultaneously and gives UE.If source ENB has notified UE activationary time, source ENB will send RLC context transfer message to purpose ENB when activationary time will arrive, each is not obtained the RLCPDU that confirms and corresponding series number notice purpose ENB, and source ENB also can send to purpose ENB by the sequence number (SN that the next one will be used during RLC SDU framing) that " RLC context transfer " message handle is used for Next RLC PDU.The RLC SDUs that purpose ENB buffer memory is received.Purpose ENB preserves the RLC contextual information receive, and the RLC PDUs that receives of buffer memory.Purpose ENB can buffer memory RLC SDUs in the buffer memory that sends, and preserve RLC PDUs in the buffer memory that resends.Same as the prior art and be not emphasis of the present invention about purpose ENB to the subsequent treatment of data, ignore detailed technical descriptioon here.

Corresponding source ENB does not determine the method for activationary time, source ENB transmission RLC PDUs is to send by 502 resource request message to another method of purpose ENB, also comprise PDU and corresponding series number that each does not obtain confirming (NACK) like this in " resource request " message, can also comprise the sequence number (SN that the next one will be used during RLC SDU framing) that is used for Next RLC PDU and can also comprise LI.This information element is optionally, if first RLCSDU is complete, does not all have segmentation, and then LI does not exist.The contextual information that also comprises other ARQ.Step 507 will not need.

After UE receives 505 switching commands, move to new sub-district.If also comprise activationary time in the switching command, UE switches to new sub-district at activationary time.508UE sends " switching is finished " message and gives purpose ENB then.If source ENB has determined activationary time, when activationary time arrived, source ENB discharged Radio Resource, and initiated the process of resource between release and the EGGSN, shown in Figure 50 9 steps.If source ENB does not determine activationary time, after purpose ENB receives 508 handoff completion messages, send the release of message to source ENB request resource, source ENB discharges Radio Resource, and initiates the process of resource between release and the EGGSN.Also can initiate to discharge the process of EGGSN resource by purpose ENB.

In the above-mentioned description to Fig. 5, user data is that RLC PDUs sends to purpose ENB by control plane " RLC context transfer " message or " resource request " message at the retransmission method of Iur.RLC SDUs sends by user plane such as GTP-U.This is the first method of data forwarding among the present invention, be that RLC PDUs (do not obtain the RLC PDUs that confirms or the RLC PDUs that do not obtain confirming in remove corresponding those RLC PDUs that SDU does not obtain confirming) transmits by control plane, RLC SDUs (refer to not have the RLC SDU of segmentation, or the RLC SDU that does not have the RLC SDU of segmentation and all do not obtain through segmentation but all segmentations confirming) transmit by user plane.

The second method of data forwarding is that RLC SDUs and RLC PDUs send by control plane.Here the notion of RLC SDUs and RLC PDUs is identical with first method.Corresponding this method, the signaling process that UE moves between two ENB illustrates in conjunction with Fig. 5.Here stress with first method to be the difference of foregoing description.RLC PDUs sends to purpose ENB by 507 " RLC context transfer " message or 502 " resource request " message of control plane.RLC SDUs sends by " SDU data forwarding " message of 506b step, comprises SDU container in the message.Corresponding RLC PDUs is the method by 507 RLC context transfer forwards, and " SDU data forwarding " and " RLC context transfer " can be independent message, also can be a piece of news.If independent message, 505 and 506b do not have absolute sequencing.If a piece of news is as " SDU data forwarding ", comprise SDU container in the message, each does not obtain the PDU that confirms and corresponding series number, the sequence number (SN that the next one will be used during RLC SDU framing) that is used for Next RLC PDU can also be comprised, LI can also be comprised.This information element is optionally, if first RLC SDU is complete, does not all have segmentation, and then LI does not exist.The contextual information that also comprises other ARQ.507 steps do not exist.502 and 503 processes (perhaps also comprising PDUs and SN information) that are used to ask purpose ENB Resources allocation among Fig. 5, do not need to set up the user plane of Iur interface, so the user plane that purpose ENB does not need to distribute Iur interface user data to transmit identifies as TEID.

The third method of data forwarding is that RLC SDUs and RLC PDUs send by user plane, and the notion of RLC SDUs and RLC PDUs is identical with first method here.Corresponding this method, the signaling process that UE moves between two ENB illustrates in conjunction with Fig. 5.Here stress difference with first method.The user plane that RLC PDUs and RLC SDUs set up by 502 and 503 steps is given purpose ENB at 506c step forwarding RLC SDUs and RLC PDUs.An indicator (indicating bit) indicates RLC PDU or RLC is SDU by being provided with in the packet header of data.The RLC contextual information does not obtain the SN of the RLC PDU correspondence confirmed as the SN that is used for next RLC PDU and each, (SN has the same order with PDU, so be man-to-man relation), (this information element is optional to LI, if first RLC SDU is complete, all there is not segmentation, then LI does not exist) and the contextual information of other ARQ can send to purpose ENB by 502 " resource request ", also can send to purpose ENB by " RLC context transfer " message of 507.Transmitting SN (each does not obtain the SN of the RLC PDU correspondence confirmed), to give another method of purpose ENB be the field of definition SN in packet.Order comprises the RLCPDU of a correspondence of a SN, the RLC PDU of a correspondence of a SN in packet.This field is optional.If be used to transmit SDU, then this field does not exist.The SN that is used for next RLC PDU also can transmit by user plane, if like this user-plane transmissions be RLC SDU, in packet, have the field of a SN.

The 4th kind of method of data forwarding is only to transmit the RLC SDUs that does not obtain confirming the RLC SDUs of RLC PDU correspondence and do not have segmentation by user plane, corresponding this method, and the signaling process that UE moves between two ENB illustrates in conjunction with Fig. 5.Here stress difference with first method.The user plane that RLC SDUs sets up by 502 and 503 steps is transmitted SDUs in the 506a step and is given purpose ENB.The RLC contextual information can send to purpose ENB by 502 " resource request " as the SN that gives next RLC PDU, also can send to purpose ENB by " RLC context transfer " message of 507.

The 5th kind of method of data forwarding is only to transmit the RLC SDUs that does not obtain confirming the RLC SDUs of RLCPDUs correspondence and do not have segmentation by user plane, corresponding this method, and the signaling process that UE moves between two ENB illustrates in conjunction with Fig. 5.Here stress difference with the 4th kind of method.The user plane that source ENB sets up by 502 and 503 steps is transmitted RLCSDUs in the 506a step and is given purpose ENB.In 507 steps, source ENB sends " RLC context transfer " information and gives purpose ENB, the RLC contextual information comprises which segmentation of corresponding which SDUs has obtained the affirmation of UE, can also comprise the SN of RLC SDU, the SN that gives next RLC PDU and the contextual information of other ARQ.Wherein " RLC context transfer " message can be a piece of news with " resource request " message also.Purpose ENB does not just need the RLC PDUs that UE was confirmed to resend to UE after receiving the data of forwarding again like this.

In the following description, also describe with first kind of data forwarding method (PDUs control plane, SDUs user plane) to the node device action specification.Corresponding other data forwarding method will particularly point out with first kind of different place.Wherein the notion of RLC PDU and RLC SDU illustrates in above-mentioned description to each method.

The motion flow of corresponding this embodiment source ENB as shown in Figure 6.

601 ENB receive message.If 602 receive the next measurement report from UE.According to measurement report information, whether the 603ENB decision moves to the better sub-district of other signal to UE.If decision moves to sub-district same ENB under to UE, then carry out the interior handoff procedure of same ENB, not emphasis of the present invention here, ignore concrete description.604 if the handoff procedure between the different ENB; 605 ENB send the ENB that " resource request " message is given place, purpose sub-district, and sign, UE sign, the UE that comprises the purpose sub-district in the message needs tunnel terminal sign (hereinafter to be referred as TEID) (being used for the up TEID between source ENB and the EGGSN), protection algorithm integrallty and password, encipherment protection algorithm and the password of the IP address of the Qos information of access service, EGGSN that current UE connects, EGGSN distribution.Wherein source RNC also can be being that UE assigned radio resource situation is told purpose RNC by resource request at source RNC, rather than directly use UE professional Qos directly to tell purpose RNC.606 source ENB wait-for-responses.

The corresponding method that sends RLC PDUs by " resource request " message, also comprise RLC PDU and corresponding series number that each does not obtain confirming (NACK) in " resource request " message, the SN (SN that the next one will be used during RLC SDU framing) that is used for next RLC PDU can also be comprised, LI can also be comprised.This information element is optionally, if first RLC SDU is complete, does not all have segmentation, and then LI does not exist.The contextual information that also comprises other ARQ.Step 612 will not need like this.

If 607 ENB receive next " resource response " message from another ENB in 601.608 if the response message of failure, inadequate resource for example, and ENB can not continue to carry out the process that switches to this sub-district.If successful response message, 609 ENB preserve information, for example the user plane of purpose ENB distribution identifies (for example TEID), RRC container (corresponding RLC SDUs also is the method that sends by control plane, and the user plane sign that does not comprise purpose ENB distribution in the message is as TEID).610 ENB send " switching command " 1 message and give UE, comprise the Radio Resource (being the RRC container that purpose ENB sends to this ENB) of purpose cell ID, new cell allocation in the message.ENB can also determine an activationary time of using new cell configuration, and network and UE survey and switch to new sub-district at activationary time simultaneously, and corresponding this method also comprises activationary time in " switching command " message.611 ENB transmit RLC SDUs by the Iur user plane of setting up and give purpose ENB.Corresponding RLCSDUs also is the method (second method) that sends by control plane, and ENB sends RLC SDUs to purpose ENB by control plane message 506b " SDU data forwarding ", comprises SDUcontainer in the message.This message can be an independently message, can be the message of a merging with 507 (corresponding 612) also.612 ENB send " RLC context transfer " message and give purpose ENB, each does not obtain the RLC PDU that confirms and corresponding series number notice purpose ENB at present, can also comprise the SN (SN that the next one will be used during RLC SDU framing), the LI that are used for next RLC PDU and the contextual information of other ARQ by this message in the message.ENB can be with PDUcontainer (container) obtaining not confirming that the RLC PDUs of (NACK) sends to purpose ENB by RLC context transfer message.Also comprise the GTP sequence number of beginning and the GTP sequence number of end in the RLC context transfer message.

610,611 and 612 do not have absolute sequencing, and for example ENB can transmission " switching command " message give UE when transmitting data to give purpose ENB, also can send " RLC context transfer " message when transmitting data and give purpose ENB.

If source ENB has notified UE activationary time, source ENB will send RLC context transfer message to purpose ENB when activationary time will arrive, each is not obtained the RLC PDU that confirms and corresponding series number notice purpose ENB, can also comprise the SN (SN that the next one will be used during RLC SDU framing) that is used for next RLC PDU in the message.

The third method that corresponding data is transmitted, source ENB gives purpose ENB in 611 steps by user plane forwarding RLC PDUs and the RLC SDUs that sets up, and indicates PDU or SDU by an indicator is set.The SN that RLC contextual information such as each do not obtain confirming the SN of RLC PDU correspondence and being used for next RLC PDU can comprise in 606 resource request, also can give purpose ENB by sending " RLC context transfer " message in 612 steps.Comprise the SN that each does not obtain the RLC PDU that confirms like this in " RLC context transfer " message, can also comprise the SN (SN that the next one will be used during RLC SDU framing), the LI that are used for next RLC PDU and the contextual information of other ARQ.Source ENB transmits SN (each does not obtain the SN of the RLCPDU correspondence confirmed), and to give another method of purpose ENB be the field of definition SN in packet, order comprises the RLC PDU of a correspondence of a SN, the RLCPDU of a correspondence of a SN in packet.This field is optional.If be used for transmitting RLC SDU, then this field does not exist.The SN that is used for next RLC PDU also can transmit by user plane, if like this user-plane transmissions be RLC SDU, in packet, have the field of a SN.

The 4th kind of method that corresponding data is transmitted, source ENB transmits the RLC SDUs that does not obtain confirming the RLC SDUs of RLC PDUs correspondence and not having segmentation in 611 steps by the user plane of setting up and gives purpose ENB.The RLC contextual information can comprise in 606 resource request as the SN (SN that the next one will be used during RLC SDU framing) that is used for next RLC PDU, also can give purpose ENB by sending " RLC context transfer " message in 612 steps.Comprise the SN that is used for next RLC PDU in " RLC context transfer " message like this.

The 5th kind of method that corresponding data is transmitted, source ENB transmits the RLC SDUs that does not obtain confirming the RLC SDUs of RLC PDUs correspondence and not having segmentation in 611 steps by the user plane of setting up and gives purpose ENB.Which segmentation of RLC contextual information such as which SDU obtained affirmation, the RLCSDU of UE SN, can in 606 resource request, comprise for the SN of next RLC PDU and the contextual information of other ARQ, also can give purpose ENB by sending " RLC context transfer " message in 612 steps.Which segmentation that comprises which RLC SDU like this in " RLC context transfer " message has obtained the SN of the affirmation of UE, RLC SDU, the SN that gives next RLC PDU and the contextual information of other ARQ.

Corresponding ENB does not determine the method for activationary time, if 613 ENB receive next " resource release request " message from purpose ENB, 614ENB discharges resource, comprises Radio Resource, the UE context, and user plane identifies as TEID.615ENB sends resource release request message to EGGSN then.The process that discharges the EGGSN resource also can be initiated by purpose ENB, the corresponding this method of initiating by purpose ENB, and step 615 does not exist.

Corresponding ENB has determined the method for activationary time, when ENB arrives at activationary time, discharges resource, comprises Radio Resource, UE context, TEID.ENB sends resource release request message to EGGSN then.The process that discharges the EGGSN resource also can be initiated by purpose ENB.

The motion flow of corresponding this embodiment purpose ENB as shown in Figure 7.

701 ENB receive message.If 702 ENB receive next " resource request " message from another one ENB, 703 ENB carry out access control according to the parameter in the request message (for example Qos or radio resource configuration parameters).If resource cannot be distributed, carry out 709 steps, ENB sends the response message of failure to source ENB.And inform that by cause value the reason of source ENB failure does not for example have Radio Resource.If requested resource can be distributed, 704 ENB create the context of this UE, and the relevant information of this UE is preserved the TEID that distributes as cell ID, UE sign, EGGSN IP address, EGGSN, protection algorithm integrallty and password, cryptographic algorithm and password.The user plane sign of purpose ENB distributing user Iur data forwarding is as TEID (corresponding RLC SDUs also is the method that sends by control plane, and purpose ENB does not need the user plane sign of distributing user Iur data forwarding as TEID).Corresponding send the method for RLC PDUs and RLC contextual information by " resource request " message, ENB preserves RLC PDUs in the message, each does not obtain the contextual information of series number, the SN that is used for next RLC PDU, LI and other ARQ of the RLC PDU correspondence confirmed.Corresponding first kind of data forwarding method, and RLC PDUs and RLC contextual information be the method that sends by " resource request ", and step 707,708 will not need.Corresponding the 5th kind of data forwarding method, and the RLC contextual information is the method that sends by " resource request ", and the RLC contextual information that the ENB preservation is received such as which segmentation of which RLC SDU have obtained the affirmation of UE, the SN of RLC SDU and the SN that gives next RLC PDU.

705 ENB send " resource response " message and give source ENB, and the resource that purpose ENB distributes is informed source ENB, and the resource that purpose ENB distributes can send to source ENB by RRC container (container).The user plane sign that is used for data forwarding that comprises purpose ENB distribution simultaneously in " resource response " message is as TEID (corresponding RLC SDUs also is the method that sends by control plane, and the user plane sign that does not comprise purpose ENB distribution in the message is as TEID).706 ENB send " UP registration " message and register to EGGSN.Comprise descending TEID, UE sign and new ENB IP address that new ENB distributes in the message.At this moment EGGSN can send data to purpose ENB.ENB receives that at purpose ENB coming " switching is finished " message (710) back to send " UP registration " message from UE gives EGGSN to another method of EGGSN registration.Corresponding this method, purpose ENB sends " UP registration " message and does not have absolute sequencing to UE (711) for EGGSN and ENB transmission data in buffer.

If 707 ENB receive next " RLC context transfer " message from another ENB 701,708 ENB preserve the RLC contextual information of receiving, for example each does not obtain the PDU that confirms and corresponding series number, the SN that is used for next RLC PDU, LI, the GTP sequence number that the forwarding data begin and the GTP sequence of end.Corresponding RLC SDUs also be by control plane send and and the method that sends by a piece of news of RLC contextual information, ENB preserves the RLC SDUs that receives.The corresponding method that sends by control plane by " resource request " message transmission RLC PDUs and RLC contextual information, RLC SDUs, ENB preserves the RLC SDUs in the message.Corresponding RLC SDUs also be by control plane send and and the method that sends by independent message of RLC contextual information, if ENB receives 506b " SDU data forwarding " message, ENB preserves the RLC SDUs that receives.

Corresponding the third and the 4th kind of data forwarding method, and the method that the RLC contextual information all sends by 507 " RLC context transfer ", when ENB receives 707 " RLC context transfer " message, 708 ENB preserve the RLC contextual information as being used for the SN of next RLC PDU, and each does not obtain the series number of the RLC PDU correspondence confirmed and the contextual information of other ARQ.

The 5th kind of method that corresponding data is transmitted, and the method that the RLC contextual information all sends by 507 " RLC context transfer ", when ENB received 707 " RLC context transfer " message, which segmentation of 708ENB preservation RLC contextual information such as which RLC SDU had obtained the SN of the affirmation of UE, RLCSDU, the SN that gives next RLC PDU and the contextual information of other ARQ.

If 710 ENB receive next " switching is finished " message from UE 701,711ENB handles and also sends data in buffer to UE.ENB abandons portion to the data of the repetition of receiving from source ENB and EGGSN simultaneously.Corresponding source ENB does not determine the method for activationary time, and 712 ENB send " resource release request " message and give source ENB.

713 steps, ENB receives data.714 receive data from the relative users plane of ENB or EGGSN such as GTP tunnel after, the data that 715 ENB buffer memorys are received.Corresponding RLC PDUs and SDUs are the methods of transmitting by user plane (method three), and according to the indicator in the packet, ENB preserves RLC PDUs and RLC SDUs respectively.The corresponding RLC contextual information for example SN of each RLC PDU correspondence or the SN that is used for next RLC PDU is the method that sends over by the user plane data bag, and ENB preserves the RLC contextual information.Corresponding RLC SDUs also is the method that sends by control plane, and ENB only receives data and buffer memory from relative users plane such as the GTP tunnel of EGGSN.

The processing of purpose ENB data cached back RLC PDUs and RLC SDUs (method one is to method four) same as the prior art, if comprise LI in the RLC contextual information, then purpose ENB will begin segmentation after the LI length of first SDU.To the further processing of data and the process that sends to UE is not emphasis of the present invention, ignores detailed technical descriptioon here.What stress here is in the method five, the RLC SDUs that purpose ENB buffer memory is received from source ENB.After RLC SDUs carried out segmentation, according to the RLC contextual information of receiving from source ENB, obtain the affirmation of UE as which segmentation of which RLC SDU, abandoned those and obtained the RLC PDUs that UE confirms, not have those UE the RLC PDUs of affirmation to send to UE.Is not emphasis of the present invention for data in the processing (for example processing of MAC and physical layer) of lower floor, ignores detailed technical descriptioon here.

The motion flow of corresponding this embodiment E GGSN as shown in Figure 8.

801 EGGSN receive message.If 802 receive " UP registration " message of coming from ENB, 803EGGSN upgrades the contextual information of corresponding UE, and the user plane of preserving descending new ENB distribution identifies the IP address of TEID for example and ENB.804 EGGSN begin to send to this ENB the data of UE.EGGSN can begin to stop when this ENB sends data to send data to the old ENB in this UE place, also can send the data of UE simultaneously to two ENB, up to just stop to send data to old ENB when receiving the resource release request of old ENB.

If 805 EGGSN receive the next resource release request from ENB 801,806 EGGSN discharge corresponding resource according to request message, as TEID.

The motion flow of corresponding this embodiment UE as shown in Figure 9.

901 steps, UE measures according to the measurement configuration of ENB.902 according to measuring configuration, UE sends " measurement report " message and gives ENB, for example the cycle or Time Triggered.The result who measures is reported to ENB.

903 steps, UE receives message.If 904 UE receive next " switching command " message from ENB, 905 UE are according to the Radio Resource situation resource allocation of the new sub-district in the switching command.If resource successfully disposes, UE moves to new sub-district.If comprise activationary time in " switching command ", UE switches to new sub-district when activationary time arrives.906 UE send " switching is finished " message in new sub-district and give ENB.

Figure 10 is in connection mode for UE, moves to the method two of another one ENB from an ENB.The feature of this method is that UE is directly switch to new sub-district, and UE notifies purpose ENB UE required Qos information, does not have to prepare in advance the process of Radio Resource.

1001 steps, according to control command and measurement result that measurement result or the UE of UE receives from ENB, UE switches to new sub-district.UE sends " handoff request " in new sub-district and gives purpose ENB.Comprise UE sign, cell ID and UE in the handoff request message and be connected professional Qos information.After purpose ENB receives handoff request message, allocation radio resource, if Radio Resource becomes the distribution of work, 1002 ENB distribute the descending user plane of Iu+ interface to identify for example TEID, " UP sets up request information and gives EGGSN in the ENB transmission.Comprise for example TEID of downlink user plane mark in the message, ENB IP address, UE sign.After EGGSN receives this message, upgrade the UE context, preserve user plane and identify for example TEID, ENB IP address distributes up user plane to identify for example TEID.1003 EGGSN send " UP sets up response " message and give purpose ENB.EGGSN stops to send data to the original ENB of UE, and beginning sends data to new ENB.Purpose ENB preserves up user plane and identifies for example TEID after receiving that UP sets up response.

Purpose ENB can know source ENB by two kinds of methods.Method one: UE informs purpose ENB by handoff request message, and corresponding this method also comprises ENB IP address, source or source ENB sign in " handoff request " message.Method two: EGGSN notice purpose ENB, corresponding this method comprises ENB IP address, source or source ENB sign in " UP sets up response " message.

1004 purpose ENB distribute the Iur interface to be used for the user plane sign of data forwarding as TEID." the data forwarding request information is given source ENB, comprises UE sign and Iur interface in the message and is used for the user plane sign of data forwarding as TEID in purpose ENB transmission.After source ENB receives the data forwarding request message, preservation information, as the user plane sign, 1005 send " data forwarding response " message gives purpose ENB.Comprise each in the message and do not obtain the RLC PDUs that confirms and corresponding sequence number, can also comprise the sequence number that is used for the RLC PDU that the next one will send.Can also comprise LI.This information element is optionally, if first RLC SDU is complete, does not all have segmentation, and then LI does not exist.Also comprise in the data forwarding response message and transmit the GTP sequence number that data begin and the GTP sequence number of end.The contextual information that also comprises other ARQ in the data forwarding response message.1006a source ENB begins RLC SDUs is sent to purpose ENB by the user plane of setting up, and is identical in the implication of RLCSDUs and the above-mentioned data forwarding method one here.1007 purpose ENB are being distributed resource, and after the UP that receives EGGSN sets up response message, send " switch and confirm " message and give UE, comprise purpose ENB in the message and are the configuration of UE assigned radio resource, UE sign, new cell ID.

The UP that the data forwarding process (1004 to 1006a) of the method Iur interface of corresponding EGGSN notice purpose ENB source ENB occurs in the Iu+ interface sets up after the process.The method that corresponding UE is informed purpose ENB source ENB by handoff request message, the data forwarding process that the UP of Iu+ interface sets up process and Iur interface does not have absolute sequencing.

The data forwarding process of Iur interface and purpose ENB send switch acknowledgment message does not have absolute sequencing to UE yet.It is after the UP that receives 1103 sets up response message to UE that but purpose ENB sends switch acknowledgment message.

1009 source of release ENB and EGGSN are used for the user-plane resources of data forwarding for this reason between the UE resource of distributing and source ENB and the purpose ENB.The process of resource can be initiated by EGGSN between source of release ENB and the EGGSN, also can be initiated or purpose ENB initiation by source ENB.If source ENB does not receive data in a period of time after having transmitted data, can discharge resource, comprise that Radio Resource, UE context, user plane identify as TEID.ENB initiates " resource release request " message and requires to discharge resource to EGGSN, and EGGSN discharges resource after receiving message.EGGSN also can discharge resource after stopping to send data to source ENB, and sends " resource release request " message to ENB, and ENB discharges resource after receiving message.The user-plane resources dispose procedure that is used for data forwarding between source ENB and the purpose ENB can be initiated by purpose ENB, purpose ENB sends the request of release to source ENB, source ENB receives the next request message from purpose ENB, discharges the resource that the Iur interface of preserving is used for data forwarding after data forwarding is finished.This process also can be initiated by source ENB.Source ENB has transmitted and has discharged the resource that the Iur interface of preserving is used for data forwarding after the data, and sends the request of release to purpose ENB, and purpose ENB discharges the resource that the Iur interface is used for data forwarding after receiving the request message that comes from source ENB.Source ENB also can comprise the flag bit designation data of an end and transmit end in the packet of transmitting.The data forwarding of finding purpose ENB finishes the back and discharges the resource that the Iur interface is used for data forwarding.

In the above-mentioned description to Figure 10, user data at the retransmission method of Iur is, RLC PDUs is that 1005 " data forwarding response " message by control plane sends to purpose ENB.RLC SDUs sends by user plane such as GTP-U.This is the first method of data forwarding among the present invention, and promptly RLCPDUs transmits by control plane, and RLC SDUs transmits by user plane.

The implication of RLC PDUs and RLC SDUs is identical with implication in the various data forwarding methods among above-mentioned Fig. 5 respectively in five kinds of data forwarding methods of corresponding Figure 10 and Figure 15.

The second method of data forwarding is that RLC SDUs and RLC PDUs send by control plane.Corresponding this method, the signaling process that UE moves between two ENB illustrates in conjunction with Figure 10.Here stress with first method to be the difference of foregoing description.Corresponding this method, 1006 SDU among the figure transmit step, source ENB sends to purpose ENB to RLC SDUs in the 1006b step by " SDU data forwarding " message that transmits control message, and comprises SDU container in the message, and that comprise among the SDUcontainer is the RLC SDUs that does not have framing.This control plane message can be an independently message, also can send by " data forwarding response " message, comprises SDU container in " data forwarding response " message.Corresponding this method, of particular note among the figure 1004 and 1005 be used for that request msg is transmitted and the processes of data forwarding, do not need to set up the user plane of Iur interface, so the user plane that purpose ENB does not need to distribute Iur interface user data to transmit identifies as TEID.Do not comprise this user plane sign in the request message, ENB does not need to preserve the user plane sign that corresponding ENB distributes.

The third method of data forwarding is that RLC SDUs and RLC PDUs send by user plane, corresponding this method, and the signaling process that UE moves between two ENB illustrates in conjunction with Figure 10.Here stress difference with first method.The user plane that RLC PDUs and RLC SDUs set up by 1004 and 1005 steps is given purpose ENB at 1006c step forwarding SDUs and PDUs.In the packet header of data,, an indicator (indicating bit) indicates PDU or SDU by being set.The RLC contextual information is as the SN that gives each RLC PDU correspondence and be used for SN, the LI of next PDU and the contextual information of other ARQ can send to purpose ENB by 1005 " data forwarding responses ".The SN that RLC contextual information such as each do not obtain the RLC PDU correspondence confirmed also can send to purpose ENB by user plane by source ENB together with data itself.Corresponding this method defines the field of SN in packet, order comprises the RLC PDU of a correspondence of a SN, the RLC PDU of a correspondence of a SN in packet.This field is optional.If be used for transmitting RLC SDU, then this field does not exist.The SN that is used for next RLC PDU also can transmit by user plane, if like this user-plane transmissions be RLC SDU, in packet, have the field of a SN.

The 4th kind of method of data forwarding is only to transmit the RLC SDUs that does not obtain confirming the RLC SDUs of RLC PDU correspondence and do not have segmentation by user plane, corresponding this method, and the signaling process that UE moves between two ENB illustrates in conjunction with Figure 10.Here stress difference with first method.The user plane that RLC SDUs sets up by 1004 and 1005 steps is transmitted RLCSDUs in the 1006a step and is given purpose ENB.The RLC contextual information can send to purpose ENB by 1005 " data forwarding responses " as the SN that is used for next RLC PDU.

The 5th kind of method of data forwarding is only to transmit the RLC SDUs that does not obtain confirming the RLC SDUs of RLC PDU correspondence and do not have segmentation by user plane, corresponding this method, and the signaling process that UE moves between two ENB illustrates in conjunction with Figure 10.Here stress difference with the 4th kind of method.The user plane that RLC SDUs sets up by 1004 and 1005 steps is transmitted RLCSDUs in the 1006a step and is given purpose ENB.The RLC contextual information comprises which segmentation of corresponding which RLC SDU has obtained the affirmation of UE, can also comprise RLC SDU SN, can send to purpose ENB by 1005 " data forwarding responses " for the SN of next RLC PDU and the contextual information of other ARQ.Purpose ENB does not just need the RLC PDUs that UE was confirmed to resend to UE after receiving the data of forwarding again like this.

In the following description, also describe with first kind of data forwarding method (RLCPDUs control plane, RLC SDUs user plane) to the node device action specification.Corresponding other data forwarding method will particularly point out with first kind of different place.

Corresponding this embodiment, wherein the motion flow of purpose ENB as shown in figure 11.

1101 ENB receive message.If 1102 receive next " handoff request " message from UE, 1103 according to the Qos in the request message, and ENB carries out access control to this UE, checks whether this UE can insert.If the response message that 1104 unavailable ENB send failure comprises the information element reason to UE in the failure, it is inadequate resource that cause value can be set.If this UE can insert.1105 ENB create UE context, preservation information, for example UE sign, cell ID, Qos etc.ENB distributes the descending user plane sign of Iu+ interface as TEID." UP sets up request information and gives EGGSN in 1106 ENB transmission.Comprise downlink user plane mark such as TEID in the message, ENB IP address, UE sign.The ENB wait-for-response.

The method that corresponding UE is informed purpose ENB source ENB by handoff request message, ENB can send at this moment that " the data forwarding request information is given source ENB (step 1107) and wait-for-response.Also can be after receiving " UP the sets up response " message of coming from EGGSN transmission " the data forwarding request information is to source ENB (step 1110) and wait-for-response.The method of corresponding EGGSN notice purpose ENB source ENB, purpose ENB can only be after receiving " UP the sets up response " message of coming from EGGSN transmission " the data forwarding request information is to source ENB (step 1110) and wait-for-response.

1108 steps, if ENB receives next " UP sets up response " message from EGGSN, 1108 ENB preserve information, for example the user plane sign of EGGSN distribution is as TEID.1110ENB can send at this moment that " the data forwarding request information is given source ENB (as mentioned above) and wait-for-response.1111 ENB send " switch and confirm " message and give UE, comprise purpose ENB in the message and are the configuration of UE assigned radio resource, UE sign, new cell ID.If " the data forwarding request information was to source ENB in transmission after ENB received " UP the sets up response " message of coming from EGGSN." the data forwarding request information " switches and confirm " message for ENB and transmission does not have absolute sequencing to UE in then ENB transmission.

1112 steps, purpose ENB receives next " data forwarding response " message from source ENB, the RLC PDUs that 1113 purpose ENB preserve the RLC contextual information and do not obtain confirming.ENB can preserve RLCPDUs and send in the buffer memory to repeating.Corresponding RLC SDUs sends and also is the method for transmitting by " data forwarding response " by control plane, the RLC SDUs that the ENB buffer memory is received.ENB can be put into the RLC SDUs that receives from source ENB before the data of receiving from EGGSN.Corresponding RLC SDUs is by one of the control plane method that sends of message 1006b " SDU data forwarding " independently, after ENB receives this message, and the RLC SDUs that buffer memory is received.ENB can be put into the RLC SDUs that receives from source ENB before the data of receiving from EGGSN.

Corresponding the third and the 4th kind of data forwarding method, when ENB receives 1112 " data forwarding response " message, comprise in corresponding " data forwarding response " message the RLC contextual information as corresponding each do not obtain the method for the SN of the SN of the RLC PDU that confirms or next RLC PDU, 1113 ENB preservation RLC contextual information does not obtain confirming the SN of RLC PDU as the SN that is used for next RLC PDU or each.

The 5th kind of method that corresponding data is transmitted, when ENB receives 1112 " data forwarding response " message, which segmentation that comprises RLC contextual information such as which RLC SDU in corresponding " data forwarding response " message has obtained the SN of the affirmation of UE, RLC SDU, the SN method of giving next PDU and the contextual information of other ARQ, and which segmentation of 1113 ENB preservation RLC contextual information such as which RLC SDU has obtained the SN of the affirmation of UE, RLC SDU, the SN that gives next RLC PDU and the contextual information of other ARQ.

111 4ENB receive data.If 1115 ENB receive from source ENB or EGGSN relative users plane such as the next user data of GTP tunnel, the data that 1116 ENB buffer memorys are received.ENB is put into the data of receiving from source ENB before the data of receiving from EGGSN.Corresponding RLC PDUs and RLC SDUs are the methods of transmitting by user plane (method three), and ENB distinguishes buffer memory RLC PDUs and RLC SDUs according to the indicator in the data packet head.The corresponding RLC contextual information for example SN of each RLC PDU correspondence (SN that perhaps is used for next RLC PDU) all is the method that sends over by the user plane data bag, and ENB preserves the RLC contextual information.Corresponding RLC SDUs is the method that sends by control plane, and ENB only receives data and buffer memory from relative users plane such as the GTP tunnel of EGGSN.

ENB is to the processing of RLC PDUs and RLC SDUs (method one is to method four) same as the prior art, if comprise LI in the RLC contextual information, then purpose ENB will begin segmentation after the LI length of first SDU.The process of data being handled and sent to UE is not an emphasis of the present invention, ignores detailed technical descriptioon here.What stress here is in the method five, the RLC SDUs that purpose ENB buffer memory is received from source ENB.After RLC SDUs carried out segmentation, according to the RLC contextual information of receiving from source ENB, obtain the affirmation of UE as which segmentation of which RLC SDU, abandoned those and obtained the RLC PDUs that UE confirms, not have those UE the RLC PDUs of affirmation to send to UE.Is not emphasis of the present invention for data in the processing (for example processing of MAC and physical layer) of lower floor, ignores detailed technical descriptioon here.

Corresponding this embodiment, wherein the motion flow of source ENB as shown in figure 12.

1201 ENB receive message.If 1202 receive from another ENB come " the data forwarding request information, 1203ENB preserves information, for example user plane identifies (corresponding RLC SDUs is the method for transmitting by control plane, does not have user's plane mark in the message).According to the UE sign of receiving in the message, 1204 source ENB send " data forwarding response " message and give purpose ENB, comprise in the message and do not obtain the RLC PDU that confirms and corresponding SN, can also comprise and be used for the RLCPDU sequence number that the next one will send, can also comprise LI.This information element is optionally, if first RLC SDU is complete, does not all have segmentation, and then LI does not exist.The contextual information that also comprises other ARQ.ENB can be with PDU container (container) obtaining not confirming that the RLC PDUs of (NACK) sends to purpose ENB by the data forwarding response message.1205 ENB begin RLC SDUs is sent to purpose ENB by the user plane of setting up.Corresponding RLC SDUs is the method that sends by control plane, ENB by one of control plane independently message 1006b " SDU data forwarding " RLCSDUs is sent to purpose ENB.Source ENB also can also comprise SDUcontainer in " data forwarding response ", SDU container comprises the RLC SDUs that source ENB sends to purpose ENB.

The third method that corresponding data is transmitted, source ENB gives purpose ENB in 1205 steps by user plane forwarding RLC PDUs and the RLC SDUs that sets up, and indicates PDU or SDU by an indicator is set.RLC contextual information such as each do not obtain the SN of the RLC PDU correspondence confirmed and are used for SN, the LI of next RLC PDU and the contextual information of other ARQ can be in " data forwarding response " message of 1204 steps to purpose ENB.Comprise the SN that each does not obtain the RLC PDU correspondence confirmed like this in " data forwarding response " message, can also comprise the SN, the LI that are used for next RLC PDU and the contextual information of other ARQ.The corresponding RLC contextual information for example SN of each RLC PDU correspondence or the SN of next PDU also is the method that sends over by the user plane data bag, does not comprise corresponding information in the message.

The 4th kind of method that corresponding data is transmitted, source ENB transmits the RLC SDUs that does not obtain confirming the RLC SDUs of RLC PDUs correspondence and not having segmentation in 1205 steps by the user plane of setting up and gives purpose ENB.The RLC contextual information is given purpose ENB as the SN that is used for next RLC PDU in " data forwarding response " message of 1204 steps.Comprise the SN that is used for next RLC PDU in " data forwarding response " message like this, do not comprise PDU container.

The 5th kind of method that corresponding data is transmitted, source ENB transmits the RLC SDUs that does not obtain confirming the RLC SDUs of RLC PDUs correspondence and not having segmentation in 1205 steps by the user plane of setting up and gives purpose ENB.Which segmentation of RLC contextual information such as which RLC SDU has obtained the contextual information of affirmation, the SN of RLC SDU, the SN that gives next RLC PDU and other ARQ of UE and has given purpose ENB in " data forwarding response " message of 1204 steps.Which segmentation that comprises which RLC SDU like this in " RLC context transfer " message has obtained the SN of the affirmation of UE, RLC SDU, the SN that gives next RLC PDU and the contextual information of other ARQ.

1206, this step is the resource dispose procedure that corresponding source ENB initiates.If source ENB does not receive data in a period of time after having transmitted data, can discharge resource, comprise that Radio Resource, UE context, user plane identify as TEID.ENB initiates " resource release request " message and requires to discharge resource to EGGSN,

Corresponding EGGSN initiates the method for resource dispose procedure, if 1207 ENB receive next " resource release request " message from EGGSN, ENB discharges resource, comprises that Radio Resource, UE context, user plane identify as TEID.If ENB receives the next resource release request from purpose ENB 1207, ENB discharges resource.

Corresponding this embodiment, wherein the motion flow of EGGSN as shown in figure 13.

1301 EGGSN receive message.If 1302 receive from ENB come " UP sets up request information, and 1303 EGGSN upgrade the contextual information of corresponding UE, preserves user plane sign that descending new ENB the distributes IP address as TEID and ENB.1304 EGGSN distribute the descending TEID for new ENB.1305 EGGSN send " UP sets up response " message and give new ENB.1306 EGGSN stop to send data to the old ENB in this UE place, and beginning sends the data of UE to this new ENB.

Corresponding EGGSN initiation source of release ENB and EGGSN be the method for the resource of UE distribution for this reason, and 1307 EGGSN discharge resource, and sends " resource release request " message to old ENB, comprises the UE sign in the message.

Corresponding source ENB initiates source of release ENB and the EGGSN method of the UE resource of distributing for this reason, if 1308 EGGSN receive the resource release request of coming from ENB, 1309 discharge corresponding resource according to request message, identify as user plane.

Corresponding this embodiment, wherein the motion flow of UE as shown in figure 14.

1401 steps, UE measures according to the measurement configuration of ENB.1402 according to measurement result, perhaps UE order of receiving (for example current area nearly overload order) and measurement result from ENB, and UE switches to new sub-district.1403 UE send " handoff request " message and give purpose ENB in new sub-district.

1404 steps, UE receives message.If 1405 UE receive next " switch and confirm " message from ENB, 1406 UE are according to the Radio Resource situation resource allocation that switches the new sub-district in confirming.After resource distribution was finished, 1407 UE transmitted and receive data in new sub-district.

Figure 15 is in connection mode for UE, moves to the method three of another one ENB from an ENB.The feature of this method is that UE is directly switch to new sub-district, and source ENB notice purpose ENB knows the Qos information that UE is required, does not have to prepare in advance the process of Radio Resource.

1501 steps, according to control command and measurement result that measurement result or the UE of UE receives from ENB, UE switches to new sub-district.UE sends " handoff request " in new sub-district and gives purpose ENB.Comprise UE sign, cell ID and ENB IP address, source or source ENB sign in the handoff request message.After 1502 purpose ENB received handoff request message, purpose ENB distributed the Iur interface to be used for the user plane sign of data forwarding as TEID." the data forwarding request information is given source ENB, comprises UE sign and Iur interface in the message and is used for the user plane sign of data forwarding as TEID in purpose ENB transmission.After source ENB received the data forwarding request message, the user plane sign was as TEID in the preservation request message, and 1503 send " data forwarding response " message gives purpose ENB.Comprise in the message and do not obtain the RLC PDU that confirms and corresponding SN, can also comprise the sequence number and the UE that are used for the RLC PDU that the next one will send and connect professional Qos information, can also comprise LI.This information element is optionally, if first RLC SDU is complete, does not all have segmentation, and then LI does not exist.The contextual information that also comprises other ARQ.ENB can be with PDU container (container) obtaining not confirming that the RLC PDUs of (NACK) sends to purpose ENB by the data forwarding response message.Also comprise in the data forwarding response message and transmit the GTP sequence number that data begin and the GTP sequence number of end.1504a source ENB begins RLC SDUs is sent to purpose ENB by the user plane of setting up.Purpose ENB checks the resource that needs, if Radio Resource can become the distribution of work, 1505 ENB distribute the descending user plane sign of Iu+ interface as TEID, and " UP sets up request information and gives EGGSN in the ENB transmission.Comprise downlink user plane mark such as TEID in the message, ENB IP address, UE sign.After EGGSN receives this message, upgrade the UE context, preserve the user plane sign as TEID, ENB IP address distributes up user plane sign as TEID.1506 EGGSN send " UP sets up response " message and give purpose ENB.EGGSN stops to send data to the original ENB of UE, and beginning sends data to new ENB.After purpose ENB receives that UP sets up response, preserve up user plane sign as TEID.The user data that purpose ENB buffer memory is received from source ENB and EGGSN.Purpose ENB can be put into the RLC SDUs that receives from source ENB before the data of receiving from EGGSN.The SDU repeating process and 1505 of 1504a, 1506 UP set up process and can carry out simultaneously.

1507 purpose ENB are being distributed resource, and after the UP that receives EGGSN sets up response message, send " switch and confirm " message and give UE, comprise purpose ENB in the message and are the configuration of UE assigned radio resource, UE sign, new cell ID.

1508 source of release ENB and EGGSN are used for the user-plane resources of data forwarding for this reason between the UE resource of distributing and source ENB and the purpose ENB.The process of resource can have EGGSN to initiate between source of release ENB and the EGGSN, also can be initiated by source ENB.If source ENB does not receive data in a period of time after having transmitted data, can discharge resource, comprise that Radio Resource, UE context, user plane identify as TEID.ENB initiates " resource release request " message and requires to discharge resource to EGGSN, and EGGSN discharges resource after receiving message.EGGSN also can discharge resource after stopping to send data to source ENB, and sends " resource release request " message to ENB, and ENB discharges resource after receiving message.The user-plane resources dispose procedure that is used for data forwarding between source ENB and the purpose ENB can be initiated by purpose ENB, purpose ENB sends the request of release to source ENB, source ENB receives the next request message from purpose ENB, discharges the resource that the Iur interface of preserving is used for data forwarding after data forwarding is finished.This process also can be initiated by source ENB.Source ENB has transmitted and has discharged the resource that the Iur interface of preserving is used for data forwarding after the data, and sends the request of release to purpose ENB, and purpose ENB discharges the resource that the Iur interface is used for data forwarding after receiving the request message that comes from source ENB.Source ENB also can comprise the flag bit designation data of an end and transmit end in the packet of transmitting.The data forwarding of finding purpose ENB finishes the back and discharges the resource that the Iur interface is used for data forwarding.

In the above-mentioned description to Figure 15, user data is that RLC PDUs sends to purpose ENB by control plane " data forwarding response " message at the retransmission method of Iur.RLC SDUs sends by user plane such as GTP-U.This is the first method of data forwarding among the present invention, and promptly RLC PDUs transmits by control plane, and RLC SDUs transmits by user plane.

The second method of data forwarding is that RLC SDUs and RLC PDUs send by control plane.Corresponding this method, the signaling process that UE moves between two ENB illustrates in conjunction with Figure 15.Here stress with first method to be the difference of foregoing description.Corresponding this method, 1504 SDU among the figure transmit step, source ENB sends to purpose ENB to RLC SDUs in the 1504b step by " SDU data forwarding " message that transmits control message, and comprises SDU container in the message, and that comprise among the SDUcontainer is the RLC SDUs that does not have framing.This control plane message can be an independently message, also can send by " data forwarding response " message, comprises SDU container in " data forwarding response " message.Corresponding this method, of particular note among the figure 1502 and 1503 be used for that request msg is transmitted and the processes of data forwarding, do not need to set up the user plane of Iur interface, so the user plane that purpose ENB does not need to distribute Iur interface user data to transmit identifies as TEID.Do not comprise this user plane sign in the request message, ENB does not need to preserve the user plane sign that corresponding ENB distributes.

The third method of data forwarding is that RLC SDUs and RLC PDUs send by user plane, corresponding this method, and the signaling process that UE moves between two ENB illustrates in conjunction with Figure 15.Here stress difference with first method.The user plane that RLC PDUs and RLC SDUs set up by 1502 and 1503 steps is given purpose ENB at 1504c step forwarding SDUs and PDUs.In the packet header of data,, an indicator (indicating bit) indicates PDU or SDU by being set.RLC contextual information such as each do not obtain the SN of the RLC PDU correspondence confirmed and can send to purpose ENB by 1503 " data forwarding responses " for SN, the LI of next RLCPDU and the contextual information of other ARQ.The SN that RLC contextual information such as each do not obtain the RLC PDU correspondence confirmed also can send to purpose ENB by user plane by source ENB together with data itself.Corresponding this method defines the field of SN in packet, order comprises the RLC PDU of a correspondence of a SN, the RLC PDU of a correspondence of a SN in packet.This field is optional.If be used to transmit SDU, then this field does not exist.The SN that is used for next RLC PDU also can transmit by user plane, if like this user-plane transmissions be RLC SDU, in packet, have the field of a SN.

The 4th kind of method of data forwarding is only to transmit the RLC SDUs that does not obtain confirming the RLC SDUs of RLCPDUs correspondence and do not have segmentation by user plane, corresponding this method, and the signaling process that UE moves between two ENB illustrates in conjunction with Figure 15.Here stress difference with first method.The user plane that RLC SDUs sets up by 1502 and 1503 steps is transmitted SDUs in the 1504a step and is given purpose ENB.The RLC contextual information can send to purpose ENB by 1503 " data forwarding responses " as the SN that gives next RLC PDU.

The 5th kind of method of data forwarding is only to transmit the RLC SDUs that does not obtain confirming the RLC SDUs of RLCPDUs correspondence and do not have segmentation by user plane, corresponding this method, and the signaling process that UE moves between two ENB illustrates in conjunction with Figure 15.Here stress difference with the 4th kind of method.The user plane that source ENB sets up by 1502 and 1503 steps is transmitted RLCSDUs in the 1504a step and is given purpose ENB.The RLC contextual information comprises which segmentation of corresponding which RLC SDU has obtained the affirmation of UE, can also comprise RLC SDU SN, can send to purpose ENB by 1503 " data forwarding responses " for the SN of next PDU and the contextual information of other ARQ.Purpose ENB does not just need the RLC PDUs that UE was confirmed to resend to UE after receiving the data of forwarding again like this.

Corresponding this embodiment, wherein the motion flow of purpose ENB as shown in figure 16.

1601 ENB receive message.If 1602 receive next " handoff request " message from UE, 1603ENB creates UE context, preservation information, for example UE sign, cell ID, source ENB etc.Distribute the Iur interface to be used for the user plane sign of data forwarding as TEID (corresponding RLC SDUs is the method that sends by control plane, and ENB does not need to distribute this user plane sign)." the data forwarding request information is given source ENB, and wait-for-response in 1604 ENB transmission.

If 1605 purpose ENB receive next " data forwarding response " message from source ENB, RLC PDUs, UE that 1606 purpose ENB preserve the RLC contextual information and do not obtain confirming connect professional Qos.ENB can preserve RLC PDUs and send in the buffer memory to repeating.Corresponding RLC SDUs sends and also is the method for transmitting by " data forwarding response " by control plane, the RLC SDUs that the ENB buffer memory is received.ENB can be put into the RLC SDUs that receives from source ENB before the data of receiving from EGGSN.Corresponding RLC SDUs is by one of the control plane method that sends of message 1504b " SDU data forwarding " independently, after ENB receives this message, and the RLC SDUs that buffer memory is received.ENB can be put into the RLC SDUs that receives from source ENB before the data of receiving from EGGSN.Corresponding the third and the 4th kind of data forwarding method, when ENB receives 1605 " data forwarding response " message, if comprise the SN that RLC contextual information such as each do not obtain the SN of the RLC PDU that confirms or is used for next RLC PDU in the message, carry out 1606 steps.Corresponding the 5th kind of data forwarding method, the RLC contextual information also comprises which segmentation of which RLC SDUs to be confirmed by UE.1606 ENB preserve the RLC contextual information in the message.

1607 Qos according to the required business of UE, ENB carries out access control to this UE, checks whether this UE can insert.If the response message that 1608 cannot ENB sends failure comprises the information element reason to UE in the failure, it is inadequate resource that cause value can be set.ENB need discharge the information from source ENB of buffer memory during failure.If this UE can insert.1609 ENB reservation of resource, ENB distribute the descending user plane sign of Iu+ interface as TEID." UP sets up request information and gives EGGSN in the 1609ENB transmission.Comprise downlink user plane mark such as TEID in the message, purpose ENB IP address, UE sign.The ENB wait-for-response.

1610 steps, if ENB receives next " UP sets up response " message from EGGSN, 1108 ENB preserve information, for example the user plane sign of EGGSN distribution is as TEID.1612 ENB send " switch and confirm " message and give UE, comprise purpose ENB in the message and are the configuration of UE assigned radio resource, UE sign, new cell ID.

1613 ENB receive data.If 1614 ENB receive from source ENB or EGGSN relative users plane such as the next user data of GTP tunnel, the data that 1615 ENB buffer memorys are received.ENB is put into the data of receiving from source ENB before the data of receiving from EGGSN.Corresponding RLC SDUs and RLC PDUs are the methods that sends by control plane, and ENB only receives data and buffer memory from relative users plane such as the GTP tunnel of EGGSN.Corresponding RLC PDUs and RLC SDUs are the methods of transmitting by user plane (method three), and ENB distinguishes buffer memory RLC PDUs and RLCSDUs according to the indicator in the data packet head.For example each does not obtain confirming that the SN (SN that perhaps is used for next RLC PDU) of RLC PDU correspondence is the method that sends over by the user plane data bag to corresponding RLC contextual information, and ENB preserves the RLC contextual information.

Corresponding this embodiment, wherein the motion flow of source ENB is identical with the motion flow of source ENB in the method two, as shown in figure 12.Difference is that 1204 are sent in " data forwarding response " message of purpose ENB by source ENB, also comprises the Qos parameter of UE access service.

Corresponding this embodiment, wherein the motion flow of EGGSN is identical with the motion flow of source EGGSN in the method two, as shown in figure 13.

Corresponding this embodiment, wherein the motion flow of UE is identical with the motion flow of UE in the method two, as shown in figure 14.Difference is that 1403 are sent in " handoff request " message of purpose ENB by UE, comprises cell ID, UE sign, the IP address of source ENB or the sign of source ENB, does not comprise the Qos parameter of UE access service.

All be that forwarding with downlink data is that example is introduced in the description of (the several different signaling processes that comprise introduction) different pieces of information pass-through mode in the above-mentioned process that UE is moved between two ENB.For up, can not need data forwarding, if certain RLC PDU of corresponding some RLC SDU does not receive affirmation, UE repeats to send the data of whole RLC SDU again.

Also up data forwarding can be arranged, the method one that upstream data is transmitted: up RLC SDUs that needs to transmit the RLC PDUs that confirmed and these RLC PDUs of correspondence is also imperfect.Source ENB sends to EGGSN to the complete RLC SDUs that receives.Identical with the pass-through mode of above-mentioned descending RLC PDUs, the forwarding of up RLC PDUs can be transmitted by control plane, also can transmit by user plane.If RLC PDUs transmits by user plane, each corresponding SN can transmit by control plane and also can transmit together by user plane and user data.Signaling process of corresponding each method (control plane sends, user plane sends, the SN of correspondence sent with data together by control plane or user plane respectively when user plane sent) and the action of source ENB and purpose ENB are identical with the data forwarding of above-mentioned descending RLC PDUs, the retransmission method of RLC contextual information is ignored detailed technical descriptioon here with descending identical.If the data of the data of forwarded upstream and descending forwarding send on same user plane, need define an indication in data packet head is up or descending indicating bit.The indicating bit that one 1 bit is for example arranged in the packet header.

The method two that upstream data is transmitted: transmit first do not receive the complete RLC SDUs that receives after the RLC PDU and the RLC PDUs that obtains confirming but the RLC SDUs of these RLC PDUs correspondences is imperfect.Source ENB does not receive that the complete RLC SDUs that receives before the RLC PDU sends to EGGSN to first.RLC PDUs that these need be transmitted and the retransmission method of RLC SDUs have three kinds, and identical to method three with above-mentioned descending method one respectively, the retransmission method of RLC contextual information such as ARQ contextual information is also respectively with descending identical.Here ignore detailed technical descriptioon.If the data of the data of forwarded upstream and descending forwarding send on same user plane, need define an indication in data packet head is up or descending indicating bit.The indicating bit that one 1 bit is for example arranged in the packet header.

The method three that upstream data is transmitted: transmit first and do not receive RLC PDU all RLCPDUs afterwards, be included in first and do not receive the RLC PDU RLCPDUs of the complete RLC of receiving SDUs correspondence afterwards.Identical with the pass-through mode of above-mentioned descending RLC PDUs, the forwarding of up RLC PDUs can be transmitted by control plane, also can transmit by user plane.If RLC PDUs transmits by user plane, each corresponding SN can transmit by control plane and also can transmit together by user plane and user data.Signaling process of corresponding each method (control plane sends, user plane sends, the SN of correspondence sent with data together by control plane or user plane respectively when user plane sent) and the action of source ENB and purpose ENB are identical with above-mentioned descending RLC PDUs data forwarding, the retransmission method of RLC contextual information is ignored detailed technical descriptioon here with descending identical.If the data of the data of forwarded upstream and descending forwarding send on same user plane, need define an indication in data packet head is up or descending indicating bit.The indicating bit that one 1 bit is for example arranged in the packet header.

Claims

1. support the UE mobility method in a LTE system, wherein, UE moves between two ENB, comprises step:

Source ENB switches to the sub-district of another one purpose ENB to UE according to " measurement report " decision of receiving from UE, and sends " resource request " message to purpose ENB;

Source ENB sends " switching command " and gives UE;

Purpose ENB receives next " switching is finished " message from UE.

2. method according to claim 1 is characterized in that described purpose ENB sending " resource response " message to behind the ENB of source, sends " UP registration " message and registers to EGGSN.

3. method according to claim 1 is characterized in that described purpose ENB after receiving the switching command message of coming from UE, sends " UP registration " message and registers to EGGSN.

4. method according to claim 1 is characterized in that described source ENB is transmitted to purpose ENB to the RLC SDUs that UE does not also handle framing.

5. method according to claim 1 is characterized in that, described source ENB sends to purpose ENB to the RLC PDUs that does not have affirmation by control plane;

6. method according to claim 1 is characterized in that, described source ENB sends to purpose ENB to the RLC SDUs that does not also handle framing by user plane.

7. method according to claim 1 is characterized in that, described source ENB by one independently " RLC context transfer " message not have the affirmation RLC PDUs and RLC contextual information send to purpose ENB.

8. method according to claim 7 is characterized in that, comprises information element in described " RLC context transfer " message and does not obtain the RLC PDUs that confirms.

9. method according to claim 7 is characterized in that, comprises the SN that information element is used for next RLC PDU in described " RLC context transfer " message.

10. method according to claim 7 is characterized in that, each does not obtain confirming the SN of RLC PDU to comprise the information element correspondence in described " RLC context transfer " message.

11. method according to claim 7 is characterized in that, comprises the GTP series number that GTP PDU that information element transmits begins in described " RLC context transfer " message.

12. method according to claim 7 is characterized in that, comprises the GTP series number of the GTP PDU end of information element forwarding in " RLC context transfer " message.

13. method according to claim 1, it is characterized in that, when source ENB decision switches to the another one sub-district to UE, source ENB by to the message " resource request " of purpose ENB application resource the RLC contextual information with there is not the RLC PDUs of affirmation to send to purpose ENB.

14. method according to claim 13 is characterized in that comprising in described " resource request " message information element and does not obtain the RLC PDUs that confirms.

15. method according to claim 13 is characterized in that comprising the SN that information element is used for next RLC PDU in described " resource request " message.

16. method according to claim 13, each does not obtain confirming the SN of RLC PDU to it is characterized in that comprising in described " resource request " message the information element correspondence.

17. method according to claim 13 is characterized in that comprising in described " resource request " message the GTP series number that GTP PDU that information element transmits begins.

18. method according to claim 13 is characterized in that comprising in described " resource request " message the GTP series number that GTP PDU that information element transmits finishes.

19. method according to claim 1 is characterized in that comprising the integrity protection information of information element cell ID, UE sign, Qos, UE, the enciphered message of UE in described " resource request " message.

20. method according to claim 1 is characterized in that comprising in described " resource request " message information element EGGSN IP address.

21. method according to claim 1, it is characterized in that comprising in described " resource request " message information element EGGSN is the user plane sign that UE distributes.

22. method according to claim 21 is characterized in that the information element EGGSN that comprises in described " resource request " message is that the user plane sign that UE distributes is TEID.

23. method according to claim 1 is characterized in that, the Iur interface that comprises information element purpose ENB distribution in the described resource response message is used for the user plane sign of data forwarding.

24. method according to claim 23 is characterized in that, comprising the user plane sign that Iur interface that information element purpose ENB distributes is used for data forwarding in the described resource response message is TEID.

25. method according to claim 1 is characterized in that, comprises information element RRC container in the described resource response message, wherein, comprises purpose ENB among the RRC container and is the configuration of UE assigned radio resource.

26. method according to claim 1 is characterized in that, the user plane that source ENB sets up by " resource request " and " resource response " process sends to purpose ENB to the RLC SDUs that does not also have framing to handle.

27. method according to claim 1 is characterized in that, described source ENB sends to purpose ENB to the RLC SDUs that does not also have framing to handle by control plane.

28. method according to claim 27 is characterized in that, described source ENB sends to purpose ENB to RLC SDUs by " SDU data forwarding " message.

29. method according to claim 28 is characterized in that, comprises the RLC SDUs that information element does not also have framing to handle in described " SDU data forwarding " message.

30., it is characterized in that the user transmits " RLC context transfer " message of RLC PDUs and " SDU data forwarding " message that the user transmits RLC SDUs can be same message according to claim 7 or 28 described methods.

31. method according to claim 1 is characterized in that, described source ENB by user plane the RLC SDUs that does not also have framing to handle with there not be the RLC PDUs of affirmation to send to purpose ENB.

32. method according to claim 31 is characterized in that, to notify purpose ENB be RLC PDU or RLC is SDU to described source ENB by an indicating bit is set in data packet head.

33. method according to claim 31 is characterized in that, source ENB sends to purpose ENB to the series number of RLC PDU correspondence by control plane.

34. method according to claim 31 is characterized in that, source ENB sends to purpose ENB to the series number of RLC PDU correspondence by user plane.

35., it is characterized in that RLC PDU and SN have relation one to one according to claim 33 and 34 described methods.

36. method according to claim 1 is characterized in that, described source ENB by user plane the RLC SDUs that does not confirm RLC PDUs correspondence with there is not the RLC SDUs of framing to send to purpose ENB.

37. method according to claim 1 is characterized in that, described source ENB by one independently " RLC context transfer " message the RLC contextual information is sent to purpose ENB.

38., it is characterized in which segmentation that comprises which RLC SDUs of information element in described " RLC context transfer " message has obtained the affirmation of UE according to the described method of claim 37.

39. according to the described method of claim 37, it is characterized in that, comprise the SN that information element is used for next RLC PDU in described " RLC context transfer " message.

40. according to the described method of claim 37, it is characterized in that, comprise the SN of the corresponding RLC SDU of information element in described " RLC context transfer " message.

41. support the UE mobility method in the LTE system, wherein, UE moves between two ENB, comprises step:

UE switches to new sub-district according to measurement result, and UE sends " handoff request " in new sub-district and gives purpose ENB;

" UP sets up request information and gives EGGSN in purpose ENB transmission;

" the data forwarding request information is given source ENB in purpose ENB transmission;

Source ENB sends " data forwarding response " message and gives purpose ENB;

Purpose ENB distribute resource and receive EGGSN " UP sets up response and " after the message, sends " switch and confirm " message and give UE.

42., it is characterized in that described " handoff request " message comprises IP address or the source ENB sign of source ENB according to the described method of claim 41.

43., it is characterized in that described purpose ENB sends that " UP sets up request information and sends that " the data forwarding request information does not have absolute sequencing for source ENB for EGGSN and purpose ENB according to claim 41 and 42 described methods.

44., it is characterized in that described " UP sets up response " message comprises IP address or the source ENB sign of source ENB according to the described method of claim 41.

45., it is characterized in that described " handoff request " message comprises the Qos information of UE institute access service according to the described method of claim 41.

46., it is characterized in that described " data forwarding response " message comprises the Qos information of UE institute access service according to the described method of claim 41.

47., it is characterized in that described purpose ENB sends that " UP sets up request information and occurs in after " data forwarding response " message that purpose ENB receives that source ENB sends to EGGSN according to claim 41 and 46 described methods.

48., it is characterized in that described " handoff request " message comprises the cell ID of UE sign and new sub-district according to the described method of claim 41.

49., it is characterized in that described source ENB is transmitted to purpose ENB to the RLC SDUs that UE does not also handle framing according to the described method of claim 41.

50., it is characterized in that described source ENB sends to purpose ENB to the RLC PDUs that does not have affirmation by control plane according to the described method of claim 41;

51., it is characterized in that described source ENB sends to purpose ENB to the RLC SDUs that does not also handle framing by user plane according to the described method of claim 41.

52., it is characterized in that described source ENB sends to purpose ENB to the RLC PDUs and the RLC contextual information that do not have to confirm by " data forwarding response " message according to the described method of claim 41.

53. according to the described method of claim 52, it is characterized in that, comprise information element in described " data forwarding response " message and do not obtain the RLC PDUs that confirms.

54. according to the described method of claim 41, it is characterized in that, comprise the SN that information element is used for next RLC PDU in described " data forwarding response " message.

55., it is characterized in that each does not obtain confirming the SN of RLC PDU to comprise the information element correspondence in described " data forwarding response " message according to the described method of claim 52

56. according to the described method of claim 52, it is characterized in that, comprise the GTP series number that GTP PDU that information element transmits begins in described " data forwarding response " message.

57. according to the described method of claim 52, it is characterized in that, comprise the GTP series number of the GTP PDU end of information element forwarding in " data forwarding response " message.

58., it is characterized in that described " comprising information element UE in the data forwarding request information identifies according to the described method of claim 41.

59. according to the described method of claim 41, it is characterized in that, describedly " comprise the user plane sign that Iur interface that information element purpose ENB distributes is used for data forwarding in the data forwarding request information.

60., it is characterized in that described " the user plane sign that the Iur interface that the purpose ENB that comprises in the data forwarding request information distributes is used for data forwarding is TEID according to the described method of claim 59.

61., it is characterized in that the user plane that source ENB sets up by " data forwarding request " and " data forwarding response " process sends to purpose ENB to the RLC SDUs that does not also have framing to handle according to the described method of claim 41.

62., it is characterized in that described source ENB sends to purpose ENB to the RLC SDUs that does not also have framing to handle by control plane according to the described method of claim 41;

63., it is characterized in that described source ENB sends to purpose ENB to RLC SDUs by " SDU data forwarding " message according to the described method of claim 62;

64. according to the described method of claim 63, it is characterized in that, comprise the RLC SDUs that information element does not have framing to handle in described " SDU data forwarding " message.

65., it is characterized in that the user transmits " data forwarding response " message of RLC PDUs and " SDU data forwarding " message that the user transmits RLC SDUs can be same message according to claim 52 or 63 described methods.

66. according to the described method of claim 41, it is characterized in that, described source ENB by user plane the RLC SDUs that does not also have framing to handle with there not be the RLC PDUs of affirmation to send to purpose ENB.

67., it is characterized in that source ENB sends to purpose ENB to the series number of RLC PDU correspondence by control plane according to the described method of claim 66.

68., it is characterized in that source ENB sends to purpose ENB to the series number of RLC PDU correspondence by user plane according to the described method of claim 66.

69., it is characterized in that RLC PDU and SN have relation one to one according to claim 67 and 68 described methods.

70., it is characterized in that to notify purpose ENB be PDU or SDU to described source ENB by an indicating bit is set according to the described method of claim 66 in data packet head.

71. according to the described method of claim 41, it is characterized in that, described source ENB by user plane the RLC SDUs that does not confirm RLC PDUs correspondence with there is not the RLC SDUs of framing to send to purpose ENB.

72., it is characterized in that described " UP sets up and comprises information element ENB IP address in the request information according to the described method of claim 41.

73., it is characterized in that described " UP sets up and comprises information element UE sign in the request information according to the described method of claim 41.

74., it is characterized in that described " UP sets up and comprises the user plane sign that the new ENB of information element distributes in the request information according to the described method of claim 41.

75., it is characterized in that described " the user plane sign that UP sets up the new ENB distribution that comprises in the request information is TEID according to the described method of claim 74.

76. according to the described method of claim 41, it is characterized in that, comprise the user plane sign that the new EGGSN of information element distributes in described " UP sets up response " message.

77., it is characterized in that the user plane sign that the new EGGSN that comprises in described " UP sets up response " message distributes is TEID according to the described method of claim 76.

78., it is characterized in that described source ENB sends to purpose ENB to the RLC contextual information by " data forwarding response " message according to the described method of claim 41.

79., it is characterized in which segmentation that comprises which RLC SDUs of information element in described " RLC context transfer " message has obtained the affirmation of UE according to the described method of claim 78.

80. according to the described method of claim 78, it is characterized in that, comprise the SN that information element is used for next RLC PDU in described " RLC context transfer " message.

81. according to the described method of claim 78, it is characterized in that, comprise the SN of the corresponding RLC SDU of information element in described " RLC context transfer " message.

82., it is characterized in that described source ENB is the also imperfect purpose ENB that is transmitted to of RLC SDUs of the RLC PDUs of the up UE of obtaining affirmation and corresponding these RLC PDUs according to claim 1 and 41 described methods.83. 2 described methods is characterized in that described source ENB sends to purpose ENB to described RLC PDUs by control plane according to Claim 8.

83. 2 described methods is characterized in that described source ENB sends to purpose ENB to described RLC PDUs by control plane according to Claim 8.

84., it is characterized in that described source ENB sends to EGGSN to the complete RLC SDUs that receives according to claim 1 and 41 described methods.

85., it is characterized in that described source ENB does not receive that the complete RLC SDUs that receives is transmitted to purpose ENB after the RLC PDU to up first according to claim 1 and 41 described methods.

86. 5 described methods is characterized in that described source ENB is transmitted to purpose ENB by the RLC SDUs shown in the control plane handle according to Claim 8.

87. 5 described methods is characterized in that described source ENB is transmitted to purpose ENB by the RLC SDUs shown in the user plane handle according to Claim 8.

88. 5 described methods according to Claim 8, but it is characterized in that described source ENB is the imperfect purpose ENB that is transmitted to of RLC SDUs of the up RLC PDUs RLC PDUs correspondence of receiving.

89. 8 described methods is characterized in that described source ENB is transmitted to purpose ENB by the RLC PDUs shown in the control plane handle according to Claim 8.

90. 8 described methods is characterized in that described source ENB is transmitted to purpose ENB by the RLC PDUs shown in the user plane handle according to Claim 8.

91. according to claim 1 and 41 described methods, it is characterized in that described source ENB does not receive all RLC PDUs after the RLC PDU to first, be included in first and do not receive that the RLC PDUs of the complete RLC of receiving SDUs correspondence is transmitted to purpose ENB after the RLC PDU.

92., it is characterized in that described source ENB is transmitted to purpose ENB by the RLC PDUs shown in the control plane handle according to the described method of claim 91.

93., it is characterized in that described source ENB is transmitted to purpose ENB by the RLC PDUs shown in the user plane handle according to the described method of claim 91.