CN102883380A

CN102883380A - Method for supporting mobility of user equipment in LTE (Long Term Evolution) system

Info

Publication number: CN102883380A
Application number: CN2012103478355A
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: 2006-03-29
Publication date: 2013-01-16
Anticipated expiration: 2026-03-29
Also published as: CN1933663A; CN102883380B; CN1933663B

Abstract

The invention relates to a method for supporting the mobility of UE (user equipment) in a LTE (Long Term Evolution) system, wherein the UE moves between two ENBs (Evolved Node B). The method comprises the following steps that: a source ENB decides to switch the UE to a cell of another target ENB according to a measurement report received from the UE and sends a resource request message to the target ENB; the target ENB sends a resource response message to the source ENB and sends distributed resources to the source ENB; the target ENB sends an UP register message to register to an EGGSN (Enhanced Gateway Gprs Support Node); the source ENB sends a switching command to the UE; and the target ENB receives a switching completing message from the UE. According to the invention, data is ensured not to be lost when the UE moves between two ENBs; and the problem of forwarding the data between the two ENBs is solved. The method is simple, reliable and efficient.

Description

Method for supporting user equipment transferability in the LTE system

The application is called dividing an application of " method for supporting user equipment transferability in the LTE system " application for a patent for invention 200610067459.9 in the name that on March 29th, 2006 was submitted to China Intellectual Property Office.

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.The below is the description to Fig. 1 3GPP system configuration.

101 subscriber equipmenies (hereinafter to be referred as UE) are the terminal equipments of receive 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, such as Radio Resource control (hereinafter to be referred as RRC) state.105 gateway general packet radio service (be GPRS hereinafter to be referred as GPRS) support node (be 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 data transfer.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, through being before the corresponding professional user plane of setting up of this user, send data to SGSN by GTP-U, after same SGSN receives data, by GTP-U data are sent to RNC.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 layers (L1), data link layer (L2) and network layer (L3).L2 is divided into the sublayer: 204 media 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).202 BMC are only just useful when processing 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 end to end communication between the sublayer.SAP between 204 MAC and the physical layer is transmission channel.SAP between RLC and the MAC is logic channel.PDCP and BMC are respectively by PDCP and BMC SAP access.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 by 201 PDCP data are carried out head compression (upper behavior decompresses).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.Then processed by 203 RLC entities.The function of RLC is framing (cut apart and merge), automatic repeat request (hereinafter to be referred as ARQ) and encrypts.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), random access control, transport format combination selection, UE identification and logic channel and transmission channel.The function of 205 physical layers is sending and receiving 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 system, during movement that UE (does not have reorientation) between NodeB or between the RNC, by soft handover, can guarantee not losing of data.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 Mobile.

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

301 source RNC determine to carry out the SRNS repositioning process.302 source RNC send " reorientation demand " to original SGSN.Comprise the 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 " to new SGSN.Transmitting re-positioning request only just uses during reorientation between SGSN.304 new SGSN send " re-positioning request " to 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 to new SGSN.The RAB inclusion information transport layer address (the purpose RNC address of user data) of each foundation 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 " to original SGSN.This message indication purpose RNC is ready to receive the descending PDU that transmits from source SRNC.The reorientation resource allocation process is successfully completed.Transmitting relocation response only just uses in the repositioning process between SGSN.After SGSN originally received this message, 306 sent " reorientation order " message to source RNC.Comprise the RAB of needs release and the RAB that needs forwarding data in the message, SGSN is based on Qos and needing determines whether forwarding data.Need the RAB information of forwarding 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 RAB that need forwarding data based on the Qos decision, source RNC begins copy data and sends to Target RNC by the Iu interface.Use the radio bearer do not lose PDCP (loss PDCP) for each, GTP-PDU (but corresponding PDCP-PDUs sent also be not confirmed) 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 event.For example, source RNC simultaneously 307 beginning forwarding datas and 308 sends " reorientation submission " message, unless 307 trigger 308.Target RNC may send " reorientation detection " and " UE mobile message " simultaneously, and when therefore 310 purpose RNC may receive " affirmation of UE mobile message ", 307 data retransmissions were still carrying out

308 source RNC send " reorientation submissions " to Target RNC, and this process is in order to transmitting the SRNS context to Target RNC, 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 next PDCP sequence number for transmitting and receive data to UE.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 to new SGSN.Afterwards, Target RNC begins to exercise the role of service wireless network controller (hereinafter to be referred as SRNC).The mobile relevant information of 310 UE and Target RNC exchange, the sign of new SRNC for example, 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 to new SGSN.The reorientation complete process is used for finishing of notice CN SRNS repositioning process.If repositioning process is the process between the different SGSN, 312 new SGSN send finishing of the original SGSN SRNS 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 to 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 property that strengthens the mobile network, ignore detailed technology contents here.

Here being the SRNS repositioning process that do not relate to take UE tells about data retransmission in the repositioning process as example, 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 retransmission is the same.

Existing 3GPP system configuration exists upgradability poor, and call set-up time is long, and system configuration is complicated to wait shortcomings, so 3GPP standardization body is carrying out the standardization effort of LTE.For 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 (referred to herein as ENB 402), the function of SGSN and GGSN is combined becomes a network entity (referred to herein as EGGSN 403).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 the simplification 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 series winding here) is positioned at ENB.When UE moved between two ENB, a part of RLC SDU is divided 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 concept of RLC, refer to be positioned at ENB, and the two-layer protocol that at first will cut apart and merge data can be RLC, also can be the part of MAC.If RLC and MAC are combined in the future, the function of the MAC layer that just refers to is such as MAC PDU, MAC SDU.This will not affect 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, do not lose in the situation that guarantee data, improved efficiency of transmission, save system resource.

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

Source ENB according to receive from UE " measurement report " determines that UE will switch to the residential quarter of another one purpose ENB, and sends " resource request " message to purpose ENB;

Purpose ENB sends " resource response " message to 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 " to UE.

Data were not lost when the present invention had guaranteed that UE moves between two ENB, and had 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, between two ENB mobile (method one), and the motion flow of source ENB;

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

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

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

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, between two ENB mobile (method two), and the motion flow of purpose ENB;

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

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

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

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, between two ENB mobile (method two), and the motion flow of purpose ENB.

Embodiment

LTE system configuration take Fig. 4 among the present invention is told about the method that UE moves as example between two ENB, claim that here the interface between ENB and the UE is air interface (hereinafter to be referred as Uu), i.e. the interface of 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 applicable.

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

Based on the measurement of source ENB configuration, 501 UE send " measurement report " message to source ENB, the result of measurement, such as the information reporting of neighbor cell to source ENB.According to the measurement result of UE report, if source ENB determines UE is moved to the residential quarter of another one ENB (purpose ENB), 502 source ENB send " resource request " message to purpose ENB.Sign, UE sign, the UE that comprises the purpose residential quarter in the message needs the terminal sign in tunnel (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 tell purpose RNC the Radio Resource situation that at source RNC is the UE distribution by resource request, rather than directly uses 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 the resource of request can be distributed; ENB creates the context of this UE; the relevant information of this UE is preserved the user plane sign (such as TEID) of distributing such 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 retransmission.503 ENB send " resource response " message to source ENB, and the resource that purpose ENB is distributed sends to source ENB, and the Radio Resource that purpose ENB distributes can send to source ENB by RRC container (container).Comprise simultaneously the user plane sign (for example TEID) that is used for data retransmission that purpose ENB distributes in " resource response " message.If purpose ENB can not distribute corresponding resource, purpose ENB sends failed response message to source ENB, in the failed response message inclusion information pantogen because of, inform 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 successful resource response message, preserves the user plane sign such as TEID.505 source ENB send " switching command " to 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 residential quarter 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 refers to not have the RLC SDU of segmentation, or does not have the RLC SDU of segmentation and pass through segmentation the RLC SDU that all segmentations all are not confirmed.507 source ENB send " RLC context transfer " message to purpose ENB, and the RLC PDU and the corresponding series number that each are not confirmed (NACK) by this message send to purpose ENB.If comprise those among the RLC SDU of above-mentioned forwarding through segmentation but the RLC SDU that all segmentations all are not confirmed, do not comprise corresponding those PDU that SDU is not confirmed here among the RLC PDU that then is not confirmed.Also can comprise in " RLC context transfer " message for Next RLC PDU sequence number (SN that the next one will be used during the RLCSDU framing).Also comprise GTP sequence number that the GTPPDU 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.Wherein 505,506a and 507 do not have absolute sequencing, for example source ENB can begin first data retransmission, sends simultaneously " switching command " to UE.If source ENB has notified the UE activationary time, source ENB will send RLC context transfer message to purpose ENB when activationary time will arrive, each RLC PDU that is not confirmed and corresponding series number notice purpose ENB, source ENB also can send to purpose ENB to the sequence number (SN that the next one will be used during RLC SDU framing) that is used for Next RLC PDU by " RLC context transfer " message.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 to the subsequent treatment of data about purpose ENB, 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 like this each PDU that is not confirmed (NACK) and corresponding series number in " resource request " message, can also comprise the sequence number (SN that the next one will be used during RLC SDU framing) for Next RLC PDU.Step 507 will not need.

After UE receives 505 switching commands, move to new residential quarter.If also comprise activationary time in the switching command, UE switches to new residential quarter at activationary time.Then 508UE sends " switching is finished " message to purpose ENB.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 message to the release of source ENB request resource, source ENB discharges Radio Resource, and initiates the process of resource between release and the EGGSN.Also can be initiated to discharge by purpose ENB the process of EGGSN resource.

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 retransmission among the present invention, be that RLC PDUs (removing corresponding those RLCPDUs that SDU is not confirmed among the RLC PDUs that is not confirmed or the RLC PDUs that is not confirmed) transmits by control plane, RLC SDUs (but refer to not have the RLC SDU of segmentation, or do not have the RLC SDU of segmentation and pass through segmentation the RLC SDU that all segmentations all are not confirmed) transmits by user plane.

The second method of data retransmission is that RLC SDUs and RLC PDUs send by control plane.Here the concept of RLC SDUs and RLC PDUs is identical with first method.Corresponding this method, UE mobile signaling process 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 retransmission " message of 506b step, comprises SDU container in the message.Corresponding RLC PDUs is the method for transmitting by 507 RLC context transfer message, and " SDU data retransmission " 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 such as " SDU data retransmission ", comprise SDU container, PDU that each is not confirmed and corresponding series number in the message, can also comprise the sequence number (SN that the next one will be used during RLC SDU framing) for Next RLC PDU, 507 steps do not exist.502 and 503 processes (perhaps also comprising PDUs and SN information) that are used for request 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 such as TEID.

The third method of data retransmission is that RLC SDUs and RLC PDUs send by user plane, and the concept of RLC SDUs and RLC PDUs is identical with first method here.Corresponding this method, UE mobile signaling process between two ENB illustrates in conjunction with Fig. 5.Here stress the difference with first method.The user plane that RLC PDUs and RLC SDUs set up by 502 and 503 steps is transmitted RLC SDUs and RLC PDUs to purpose ENB in the 506c step.In the packet header of data, by being set, an indicator (indicating bit) indicates RLC PDU or RLCSDU.RLC contextual information SN and each SN corresponding to RLC PDU that is not confirmed as being used for next RLC PDU, (SN has the same order with PDU, so be man-to-man relation) can send to purpose ENB by 502 " resource request ", also can send to purpose ENB by " RLC context transfer " message of 507.It is the field of definition SN in packet that transmission SN (SN that each RLCPDU that is not confirmed is corresponding) gives another method of purpose ENB.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 transmission 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, the field of a SN of existence in packet.

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

In the following description to the node device action specification, also describe with the first data forwarding method (PDUs control plane, SDUs user plane).Corresponding other data forwarding method place different from the first will particularly point out.Wherein the concept 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 receipt messages.If 602 receive the next measurement report from UE.According to measurement report information, 603ENB determines whether UE is moved to the better residential quarter of other signal.If determine UE is moved to residential quarter under the same ENB, then carry out the handoff procedure in the same ENB, not emphasis of the present invention here, ignore concrete description.604 if the handoff procedure between the different ENB; 605 ENB send " resource request " message to the ENB at place, purpose residential quarter, and sign, UE sign, the UE that comprises the purpose residential quarter in the message needs the terminal sign in tunnel (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 tell purpose RNC the Radio Resource situation that at source RNC is the UE distribution by resource request, rather than directly uses 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 each RLC PDU that is not confirmed (NACK) and corresponding series number in " resource request " message, can also comprise the SN (SN that the next one will be used during RLC SDU framing) for next RLC PDU.Step 612 will not need like this.

If 607 ENB receive next " resource response " message from another ENB in 601.608 if failed response message, inadequate resource for example, and ENB can not continue to carry out the process that switches to this residential quarter.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, does not comprise the user plane sign of purpose ENB distribution in the message such as TEID).610 ENB send " switching command " message to 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 residential quarter at activationary time simultaneously, and corresponding this method also comprises activationary time in " switching command " message.611 ENB transmit RLC SDUs to purpose ENB by the Iur user plane of setting up.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 retransmission ", 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 to purpose ENB, present each RLC PDU that is not confirmed and corresponding series number notice purpose ENB, can also comprise the SN (SN that the next one will be used during RLC SDU framing) for next RLC PDU by this message in the message.ENB can send to purpose ENB to the RLC PDUs that is not confirmed (NACK) by RLC context transfer message with PDU container (container).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 send " switching command " message to UE when forwarding data is to purpose ENB, can send " RLC context transfer " message to purpose ENB in forwarding data yet.

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

The third method that corresponding data is transmitted, source ENB transmits RLC PDUs and RLC SDUs to purpose ENB in 611 steps by the user plane of setting up, and indicates PDU or SDU by an indicator is set.The SN that RLC contextual information such as each are not confirmed SN corresponding to RLC PDU and are used for next RLC PDU can comprise in 606 resource request, also can be in 612 steps by sending " RLC context transfer " message to purpose ENB.The SN that comprises like this each RLC PDU that is not confirmed in " RLC context transfer " message can also comprise the SN (SN that the next one will be used during RLC SDU framing) for next RLC PDU.It is the field of definition SN in packet that source ENB transmission SN (SN corresponding to RLC PDU that each is not confirmed) gives another method of purpose ENB, 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, the field of a SN of existence in packet.

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

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

Corresponding ENB has determined the method for activationary time, and when ENB arrived at activationary time, releasing resource comprised Radio Resource, UE context, TEID.Then ENB sends resource release request message to EGGSN.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 receipt messages.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 failed response message to source ENB.And inform that by cause value the reason of source ENB failure does not for example have Radio Resource.If the resource of request can be distributed, 704 ENB create the context of this UE, the relevant information of this UE are preserved the TEID that distributes such 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 retransmission is such 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 retransmission such as TEID).The corresponding method that sends RLC PDUs and RLC contextual information by " resource request " message, ENB preserves series number corresponding to RLC PDUs in the message, RLC PDU that each is not confirmed, is used for the SN of next RLC PDU.Corresponding the first 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.

705ENB sends " resource response " message to 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).Comprise simultaneously the user plane sign that is used for data retransmission of purpose ENB distribution in " resource response " message such as TEID (corresponding RLC SDUs also is the method that sends by control plane, does not comprise the user plane sign of purpose ENB distribution in the message such 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 after UE comes " switching is finished " message (710) at purpose ENB to another method of EGGSN registration and sends " UP registration " message to EGGSN.Corresponding this method, purpose ENB transmission " UP registration " message does not have absolute sequencing to the data of EGGSN and ENB transmission buffer memory to UE (711).

If 707 ENB receive next " RLC context transfer " message from another ENB 701,708ENB preserves the RLC contextual information receive, for example each PDU that is not confirmed and corresponding series number, the SN that is used for next RLC PDU, the GTP sequence number that forwarding data begins 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 retransmission " 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 such as the SN for next RLC PDU, and each series number corresponding to RLC PDU that is not confirmed.

If 710 ENB receive next " switching is finished " message from UE 701,711 ENB process and send the data of buffer memory 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 712ENB sends " resource release request " message to source ENB.

713 steps, the ENB receive 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 (method three) of transmitting by user plane, and according to the indicator in the packet, ENB preserves respectively RLC PDUs and RLC SDUs.The corresponding RLC contextual information SN that for example each RLC PDU is corresponding or the SN that is used for next RLC PDU are the methods 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 is receive data and buffer memory on the relative users plane of EGGSN such as the GTP tunnel only.

The processing of the data cached rear RLC PDUs of purpose ENB and RLC SDUs is same as the prior art, is not emphasis of the present invention to the further processing of data and the process that sends to UE, ignores detailed technical descriptioon here.

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

801 EGGSN receipt messages.If 802 receive " UP registration " message of coming from ENB, 803 EGGSN upgrade 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 the ENB old to this UE place when this ENB sends data and send data, also can send simultaneously the data of UE to two ENB, until 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, such 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 to ENB, for example the cycle or the time triggers.The report the test of measuring to ENB.

903 steps, the UE receipt 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 residential quarter in the switching command.If resource successfully configures, UE moves to new residential quarter.If comprise activationary time in " switching command ", UE switches to new residential quarter when activationary time arrives.906 UE send " switching is finished " message to ENB in new residential quarter.

Figure 10 is that UE is in connection mode, moves to the method two of another one ENB from an ENB.The feature of the method is that UE is directly switch to new residential quarter, 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 residential quarter.UE sends " handover request " to purpose ENB in new residential quarter.Comprise UE sign, cell ID and UE in the handover request message and connect professional Qos information.After purpose ENB receives handover request message, allocation radio resource, if Radio Resource becomes the distribution of work, 1002ENB distributes the descending user plane of Iu+ interface to identify for example TEID, " UP sets up request information to 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 to 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 handover request message, and corresponding this method also comprises ENB IP address, source or source ENB sign in " handover 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 retransmission such as TEID." the data retransmission request information comprises UE sign and Iur interface and is used for the user plane sign of data retransmission such as TEID to source ENB in the message in purpose ENB transmission.After source ENB receives the data retransmission request message, preservation information, such as the user plane sign, 1005 send " data retransmission response " message to purpose ENB.Comprise each RLC PDUs that is not confirmed and corresponding sequence number in the message, can also comprise the sequence number of the RLC PDU that will send for the next one.Also comprise GTP sequence number that forwarding data begins and the GTP sequence number of end in the data retransmission response message.1006a source ENB begins RLC SDUs is sent to purpose ENB by the user plane of setting up.1007 purpose ENB are distributing resource, and after the UP that receives EGGSN sets up response message, send " switch and confirm " message to UE, comprise purpose ENB in the message and be radio-resource-configuration that UE distributes, 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.Corresponding UE is informed the method for purpose ENB source ENB by handover 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 retransmission 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 releasing resource, comprise that Radio Resource, UE context, user plane identify such as TEID.ENB initiates " resource release request " message and requires releasing resource to EGGSN, and EGGSN receives releasing resource after the message.EGGSN also can be after stopping to send data to source ENB, and releasing resource, and send " resource release request " message to ENB, ENB are received releasing resource after the message.The user-plane resources dispose procedure that is used for data retransmission between source ENB and the purpose ENB can be initiated by purpose ENB, purpose ENB sends releasing request 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 retransmission after data retransmission is finished.This process also can be initiated by source ENB.Source ENB discharges the resource that the Iur interface of preserving is used for data retransmission after having transmitted data, and sends releasing request to purpose ENB, and purpose ENB receives behind the next request message of source ENB, discharges the resource that the Iur interface is used for data retransmission.Source ENB also can comprise the flag bit designation data of an end and transmit end in the packet of transmitting.Purpose ENB finds to discharge the resource that the Iur interface is used for data retransmission after data retransmission finishes

In the above-mentioned description to Figure 10, user data at the retransmission method of Iur is, RLC PDUs is that 1005 " data retransmission 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 retransmission among the present invention, and namely RLCPDUs transmits by control plane, and RLC SDUs transmits by user plane.

The second method of data retransmission is that RLC SDUs and RLC PDUs send by control plane.Corresponding this method, UE mobile signaling process 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 retransmission " message that transmits control message, comprise SDU container in the message, that comprise among the SDU container is the RLC SDUs that does not have framing.This control plane message can be an independently message, also can send by " data retransmission response " message, comprises SDU container in " data retransmission 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 retransmission, 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 such 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 retransmission is that RLC SDUs and RLC PDUs send by user plane, corresponding this method, and UE mobile signaling process between two ENB illustrates in conjunction with Figure 10.Here stress the difference with first method.The user plane that RLC PDUs and RLC SDUs set up by 1004 and 1005 steps is transmitted SDUs and PDUs to purpose ENB in the 1006c step.In the packet header of data, by being set, an indicator (indicating bit) indicates PDU or SDU.The RLC contextual information can send to purpose ENB by 1005 " data retransmission responses " such as the SN that gives SN corresponding to each RLC PDU and be used for next PDU.The SN that RLC contextual information such as the RLC PDU that each is not confirmed are corresponding 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, the field of a SN of existence in packet.

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

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

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

1101 ENB receipt messages.If 1102 receive next " handover 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 access.If 1104 unavailable ENB send failed response message to UE, in the failure inclusion information pantogen because of, it is inadequate resource that cause value can be set.If this UE can access.1105ENB creates UE context, preservation information, such as UE sign, cell ID, Qos etc.ENB distributes the descending user plane sign of Iu+ interface such as TEID." UP sets up request information to 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.

Corresponding UE is informed the method for purpose ENB source ENB by handover request message, ENB can send at this moment that " the data retransmission request information is to source ENB (step 1107) and wait-for-response.Also can be after receiving " UP sets up response " message of coming from EGGSN transmission " the data retransmission 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 sets up response " message of coming from EGGSN transmission " the data retransmission 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, 1108ENB preserves information, for example the user plane sign of EGGSN distribution is such as TEID.1110 ENB can send at this moment that " the data retransmission request information is to source ENB (as mentioned above) and wait-for-response.1111 ENB send " switch and confirm " message to UE, comprise purpose ENB in the message and be radio-resource-configuration that UE distributes, UE sign, new cell ID.If " the data retransmission request information was to source ENB in transmission after ENB received " UP sets up response " message of coming from EGGSN." the data retransmission request information does not have absolute sequencing to ENB and transmission " switching is confirmed " message to UE in then ENB transmission.

1112 steps, purpose ENB receives next " data retransmission response " message from source ENB, the RLC PDUs that 1113 purpose ENB preserve the RLC contextual information and are not confirmed.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 retransmission 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 retransmission " 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 retransmission response " message, comprise the RLC contextual information in corresponding " data retransmission response " message such as the method for the SN of the SN of corresponding each RLC PDU that is not confirmed or next RLC PDU, 1113ENB preserves the RLC contextual information as not being confirmed the SN of RLC PDU for the SN of next RLC PDU or each.

1114 ENB receive datas.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 RLCSDUs are the methods (method three) of transmitting by user plane, and ENB distinguishes buffer memory RLC PDUs and RLC SDUs according to the indicator in the data packet head.The corresponding RLC contextual information SN that for example each RLC PDU is corresponding (SN that perhaps 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 is the method that sends by control plane, and ENB is receive data and buffer memory on the relative users plane of EGGSN such as the GTP tunnel only.

ENB is same as the prior art to the processing of RLC PDUs and RLC SDUs, and the process of data being processed and sent to UE is not emphasis of the present invention, ignores detailed technical descriptioon here.

Corresponding this embodiment, wherein the motion flow of source ENB as shown in figure 12.1201 ENB receipt messages.If 1202 receive from another ENB come " the data retransmission request information, 1203 ENB preserve information, for example user plane sign (corresponding RLC SDUs is the method for transmitting by control plane, does not have user plane to identify in the message).According to the UE sign of receiving in the message, 1204 source ENB send " data retransmission response " message to purpose ENB, comprise the RLC PDU and the corresponding SN that are not confirmed in the message, can also comprise the RLC PDU sequence number that will send for the next one.ENB can send to purpose ENB to the RLC PDUs that is not confirmed (NACK) by the data retransmission response message with PDU container (container).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 retransmission " RLC SDUs is sent to purpose ENB.Source ENB also can also comprise SDU container in " data retransmission response ", SDU container comprises the RLCSDUs that source ENB sends to purpose ENB.

The third method that corresponding data is transmitted, source ENB transmits RLC PDUs and RLC SDUs to purpose ENB in 1205 steps by the user plane of setting up, and indicates PDU or SDU by an indicator is set.The SN that RLC contextual information such as the RLC PDU that each is not confirmed are corresponding and be used for the SN of next RLC PDU can be in " data retransmission response " message of 1204 steps to purpose ENB.Comprise SN corresponding to RLC PDU that each is not confirmed in " data retransmission response " message like this, can also comprise the SN for next RLC PDU.The SN of the corresponding RLC contextual information SN that for example each RLC PDU is corresponding or 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 is not confirmed RLC SDUs corresponding to RLC PDUs and do not have a segmentation to purpose ENB in 1205 steps by the user plane of setting up.The RLC contextual information such as the SN that is used for next RLC PDU in " data retransmission response " message of 1204 steps to purpose ENB.Comprise like this SN for next RLC PDU in " data retransmission response " message, do not comprise PDU container.

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 releasing resource, comprise that Radio Resource, UE context, user plane identify such as TEID.ENB initiates " resource release request " message and requires releasing resource to EGGSN,

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

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

1301 EGGSN receipt messages.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 distributes such as the IP address of TEID and ENB.1304 EGGSN distribute the descending TEID for new ENB.1305 EGGSN send " UP sets up response " message to new ENB.1306EGGSN stops the ENB old to this UE place and sends data, 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, 1307 EGGSN releasing resources, and send " resource release request " message to old ENB, comprise the UE sign in the message.

Corresponding source ENB initiates for this reason method of the UE resource of distributing of source of release ENB and EGGSN, if 1308 EGGSN receive the resource release request come from ENB, 1309 discharge corresponding resource according to request message, identify such 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, the perhaps UE order of receiving from ENB (for example current area nearly overload order) and measurement result, and UE switches to new residential quarter.1403 UE send " handover request " message to purpose ENB in new residential quarter.

1404 steps, the UE receipt 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 residential quarter in confirming.After resource distribution was finished, 1407 UE transmitted and receive data in new residential quarter.

Figure 15 is that UE is in connection mode, moves to the method three of another one ENB from an ENB.The feature of the method is that UE is directly switch to new residential quarter, 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 residential quarter.UE sends " handover request " to purpose ENB in new residential quarter.Comprise UE sign, cell ID and ENB IP address, source or source ENB sign in the handover request message.After 1502 purpose ENB received handover request message, purpose ENB distributed the Iur interface to be used for the user plane sign of data retransmission such as TEID." the data retransmission request information comprises UE sign and Iur interface and is used for the user plane sign of data retransmission such as TEID to source ENB in the message in purpose ENB transmission.After source ENB received the data retransmission request message, the user plane sign was such as TEID in the preservation request message, and 1503 send " data retransmission response " message to purpose ENB.Comprise the RLC PDU and the corresponding SN that are not confirmed in the message, sequence number and the UE that can also comprise the RLC PDU that will send for the next one connect professional Qos information.ENB can send to purpose ENB to the RLC PDUs that is not confirmed (NACK) by the data retransmission response message with PDU container (container).Also comprise GTP sequence number that forwarding data begins and the GTP sequence number of end in the data retransmission response message.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, 1505ENB distributes the descending user plane sign of Iu+ interface such as TEID, and " UP sets up request information to 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 such as TEID, ENB IP address distributes up user plane sign such as TEID.1506 EGGSN send " UP sets up response " message to 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 such 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 distributing resource, and after the UP that receives EGGSN sets up response message, send " switch and confirm " message to UE, comprise purpose ENB in the message and be radio-resource-configuration that UE distributes, UE sign, new cell ID.

1508 source of release ENB and EGGSN are used for the user-plane resources of data retransmission 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 releasing resource, comprise that Radio Resource, UE context, user plane identify such as TEID.ENB initiates " resource release request " message and requires releasing resource to EGGSN, and EGGSN receives releasing resource after the message.EGGSN also can be after stopping to send data to source ENB, and releasing resource, and send " resource release request " message to ENB, ENB are received releasing resource after the message.The user-plane resources dispose procedure that is used for data retransmission between source ENB and the purpose ENB can be initiated by purpose ENB, purpose ENB sends releasing request 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 retransmission after data retransmission is finished.This process also can be initiated by source ENB.Source ENB discharges the resource that the Iur interface of preserving is used for data retransmission after having transmitted data, and sends releasing request to purpose ENB, and purpose ENB receives behind the next request message of source ENB, discharges the resource that the Iur interface is used for data retransmission.Source ENB also can comprise the flag bit designation data of an end and transmit end in the packet of transmitting.Purpose ENB finds to discharge the resource that the Iur interface is used for data retransmission after data retransmission finishes.

In the above-mentioned description to Figure 15, user data is that RLC PDUs sends to purpose ENB by control plane " data retransmission 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 retransmission among the present invention, and namely RLC PDUs transmits by control plane, and RLC SDUs transmits by user plane.

The second method of data retransmission is that RLC SDUs and RLC PDUs send by control plane.Corresponding this method, UE mobile signaling process 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 retransmission " message that transmits control message, comprise SDU container in the message, that comprise among the SDU container is the RLC SDUs that does not have framing.This control plane message can be an independently message, also can send by " data retransmission response " message, comprises SDU container in " data retransmission 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 retransmission, 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 such 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 retransmission is that RLC SDUs and RLC PDUs send by user plane, corresponding this method, and UE mobile signaling process between two ENB illustrates in conjunction with Figure 15.Here stress the difference with first method.The user plane that RLC PDUs and RLC SDUs set up by 1502 and 1503 steps is transmitted SDUs and PDUs to purpose ENB in the 1504c step.In the packet header of data, by being set, an indicator (indicating bit) indicates PDU or SDU.The SN that RLC contextual information such as the RLC PDU that each is not confirmed are corresponding and can send to purpose ENB by 1503 " data retransmission responses " for the SN of next RLC PDU.The SN that RLC contextual information such as the RLC PDU that each is not confirmed are corresponding 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 transmission 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, the field of a SN of existence in packet.

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

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

1601 ENB receipt messages.If 1602 receive next " handover request " message from UE, 1603ENB creates UE context, preservation information, such as UE sign, cell ID, source ENB etc.Distribute the Iur interface to be used for the user plane sign of data retransmission such 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 retransmission request information is to source ENB, and wait-for-response in 1604 ENB transmission.

If 1605 purpose ENB receive next " data retransmission response " message from source ENB, 1606 purpose ENB preserve the RLC contextual information and reach the Qos that the RLC PDUs, the UE that are not confirmed connect business.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 retransmission 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 retransmission " 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 retransmission response " message, if comprise the SN of RLC contextual information such as the RLC PDU that each is not confirmed in the message or be used for the SN of next RLC PDU, 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 access.Send failed response message to UE if 1608 cannot ENB, in the failure inclusion information pantogen because of, it is inadequate resource that cause value can be set.If this UE can access.1609 ENB reservation of resource, ENB distribute the descending user plane sign of Iu+ interface such as TEID." UP sets up request information to EGGSN in 1609 ENB 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, 1108ENB preserves information, for example the user plane sign of EGGSN distribution is such as TEID.1612 ENB send " switch and confirm " message to UE, comprise purpose ENB in the message and be radio-resource-configuration that UE distributes, UE sign, new cell ID.

1613 ENB receive datas.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 RLCPDUs are the methods that sends by control plane, and ENB is receive data and buffer memory on the relative users plane of EGGSN such as the GTP tunnel only.Corresponding RLC PDUs and RLC SDUs are the methods (method three) of transmitting by user plane, and ENB distinguishes buffer memory RLC PDUs and RLC SDUs according to the indicator in the data packet head.Corresponding RLC contextual information for example each not to be confirmed SN corresponding to RLC PDU (SN that perhaps is used for next RLC PDU) be the method that sends over by the user plane data bag, 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 retransmission 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 " handover 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.

Above-mentioned all is to introduce as an example of the forwarding of downlink data example in the description of (the several different signaling processes that comprise introduction) different pieces of information pass-through mode in the mobile process between two ENB to UE.For up, can not need data retransmission, if certain RLCPDU of corresponding some RLC SDU does not receive affirmation, UE repeats to send the data of whole RLC SDU again.

Also up data retransmission can be arranged, up needs to transmit the RLC PDUs that confirmed.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 by user plane.The signaling process of corresponding each method and the action of source ENB and purpose ENB are identical with above-mentioned downlink data forwarding, ignore detailed technical descriptioon here.If the data of the data of forwarded upstream and descending forwarding send at same user plane, need to define an indication in data packet head is up or descending indicating bit.The indicating bit that 1 bit is for example arranged in the packet header.

Claims

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

Source ENB determines UE is switched to the residential quarter of purpose ENB according to " measurement report " received from UE, and sends " resource request " message to purpose ENB;

Purpose ENB sends " resource response " message to source ENB;

Source ENB sends " switching command " to UE;

Source ENB is there not being the two-layer protocol SDU that processes to send to purpose ENB;

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

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

2. method according to claim 1 characterized by further comprising: source ENB sends RLC context transfer message to purpose ENB, and described RLC context transfer message comprises the sequence number SN for the descending two-layer protocol PDU of the next one.

3. method according to claim 1 is characterized in that inclusion information element cell ID in described " resource request " message, UE sign, QoS.

4. method according to claim 1 and 2 is characterized in that, the user plane sign that is used for data retransmission that inclusion information element purpose ENB distributes in the described resource response message.

5. method according to claim 4 is characterized in that, the user plane sign that is used for data retransmission that inclusion information element purpose ENB distributes in the described resource response message is the terminal sign in tunnel.

6. method according to claim 1 and 2 is characterized in that, inclusion information element RRC container in the described resource response message, and wherein, comprising purpose ENB in the RRC container is the radio-resource-configuration that UE distributes.

7. method according to claim 1 and 2 is characterized in that inclusion information element EGGSN is the user plane sign that UE distributes in described " resource request " message.

8. method according to claim 7 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 the terminal sign in tunnel.

9. support the UE mobility method in a LTE system, wherein, UE is mobile between two ENB, comprises step:

Purpose ENB sends " resource response " message to source ENB;

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

Source ENB sends " switching command " to UE;

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

10. method according to claim 9 characterized by further comprising: source ENB sends RLC context transfer message to purpose ENB, and described RLC context transfer message comprises the sequence number SN for the descending two-layer protocol PDU of the next one.