CN1933663B

CN1933663B - Method for supporting user equipment transferability in LTE system

Info

Publication number: CN1933663B
Application number: CN2006100674599A
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: 2012-10-24
Anticipated expiration: 2026-03-29
Also published as: CN102883380B; CN102883380A; CN1933663A

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 measurement report received from UE and sending resource request message to destination ENB, sending resource response message to source ENB by destination ENB and sending distributed resource to source ENB, sending UE logon message to EGGSN for carrying out 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 GSM Long Term Evolution (hereinafter to be referred as the LTE) system that third generation gpp (hereinafter to be referred as 3GPP) proposes.

Background technology

Existing third generation gpp (hereinafter to be referred as 3GPP) structure is as shown in Figure 1.Be description below to Figure 13 GPP system configuration.

101 subscriber equipmenies (hereinafter to be referred as UE) are the terminal equipments that is used for receiving data.102NodeB is the node 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, like 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.107E-PDN is outside public data network, and data source is provided.

After existing GGSN receives user data,, send data to SGSN, after same SGSN receives data, send to RNC to data through GTP-U through GTP-U through being before the corresponding professional user plane of setting up of this user.User data combines Fig. 2 to introduce 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 through 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 201PDCP.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 the 203RLC entity 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 the various network entity, 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) through transmission channel transmits between RNC and Node B.

In existing systems, UE through soft handover, can guarantee not losing of data when (not having reorientation) moves between NodeB or between the RNC.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 the detailed description of each step in the flow below.

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 or the reorientation between the SGSN in the same 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, between Target RNC and new SGSN, set up RAB (hereinafter to be referred as RAB).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 the descending PDU that the SRNC reception is transmitted from the source.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 through " re-positioning request affirmation " message is the same.These parameters be used for downlink network protocol Data Unit (hereinafter to be referred as N-PDU) from the source SRNC to the forwarding of purpose RNC through the Iu interface.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 through 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 through 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 possibly begin to transmit data and 308 while 307 and send " reorientation submission " message, only if 307 trigger 308.Target RNC possibly send " reorientation detection " and " UE mobile message " simultaneously, and when therefore 310 purpose RNC possibly receive " affirmation of UE mobile message ", 307 data forwarding were still being carried out

308 source RNC send " reorientation submissions " and give Target RNC, this process in order to transmission SRNS context to Target RNC, and the role of SRNS from the 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.Do not send PDP Context for requiring in proper order, 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 trigger messages 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 completion " message and gives new SGSN.The reorientation complete process is used to notify the CN SRNS completion of repositioning process.If repositioning process is the process between the different SGSN, 312 new SGSN send the completion of the original SGSNSRNS repositioning process of " transmitting reorientation accomplishes " message informing.SGSN originally sends response message and " transmits reorientation and accomplish affirmation " message to new SGSN.After receiving that message is accomplished in reorientation, SRNC switches to purpose RNC to SGSN from the source user plane.If 311 SRNS reorientations are the SRNS reorientations between the different SGSN; After new SGSN receives " reorientation completion " 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 when the repositioning process between reorientation completion message or the different SGSN received that transmitting reorientation accomplishes message, 313 old SGSN sent the Iu release command message to source SRNC.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 carried out through the Iu interface, rather than through 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 complicacy, so 3GPP standardization body is carrying out the standardization effort of LTE.To the demand of LTE, each company has all proposed the LTE system configuration of hoping, wherein a kind of LTE system configuration of proposition is as shown in Figure 4.As synthesizing a network entity (calling ENB402 here) to the function of original RNC and NodeB, the function of SGSN and GGSN lumps together becomes a network entity (being called EGGSN403 here).Wherein packet data compression protocol (hereinafter to be referred as PDCP) is the function of original RNC, in LTE, also can be placed on EGGSN.Come simplified system through reducing network node like this, reduce the time delay of system.Wherein 401UE and 404E-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 moved between two ENB, a part of RLC SDU had been cut apart PDU, and how between two ENB, to transmit these data (PDU, SDU) 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 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 lump together in the future, the function of the MAC layer that just is meant is like 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.

Be to realize above-mentioned purpose, support the UE mobility method in a kind of LTE system, wherein, UE moves between two ENB, comprises step:

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

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 between two ENB, moves

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

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

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

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

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

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

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

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

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

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

Figure 16 is that UE is in connection mode, between two ENB, moves (method two), the motion flow of purpose 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 characteristic 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, 501UE sends " measurement report " message and gives source ENB, the result who measures, gives source ENB like the report information of neighbor cell.According to the measurement result of UE report, if source ENB determines to move to UE 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 RNC be that UE assigned radio resource situation is told purpose RNC through resource request in the source, 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 requested resource can be distributed; ENB creates the context of this UE, preserves the user plane sign (like TEID) of distributing like cell ID, UE sign, EGGSN IP address, EGGSN, protection algorithm integrallty and password, AES and password to the relevant information of this UE.The user plane sign (for example TEID) of purpose ENB distributing user Iur data forwarding.503ENB sends " resource response " message and gives source ENB, and the resource of distributing purpose ENB sends to source ENB, and purpose ENB assigned radio resource can send to source ENB through 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 and gives source ENB, comprises the information element reason in the response message of failure, informs that through 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 " switch and the accomplish " message of coming from UE.

Source ENB receives the resource response message of success, preserves the user plane sign like TEID.505 source ENB send " switching command " and give UE, notify UE the new Radio Resource that purpose ENB distributes through this message.Source ENB also can determine an activationary time, sends to UE through " switching command ", and network and UE switch to new sub-district at activationary time like this.506a source ENB begins to send to purpose ENB to RLC SDU through the Iur user plane of having set up.But the RLC SDU here is meant does not have the RLC of segmentation SDU, or the RLC SDU that does not have the RLC SDU of segmentation and all do not obtain through segmentation all segmentations confirming.507 source ENB send " RLC context transfer " message and give purpose ENB, do not obtain confirming that the RLC PDU of (NACK) and corresponding series number send to purpose ENB to each through this message.All do not obtain the RLC SDU that confirms if comprise those among the RLC SDU of above-mentioned forwarding through segmentations but all segmentations, do not comprise a corresponding SDU here among the RLC PDU that does not then obtain confirming and all do not obtain those PDU of confirming.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).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, through these two information elements, purpose ENB can abandon portion to the data that ENB and EGGSN receive from the source simultaneously.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 and gives purpose ENB when activationary time will arrive; Each RLC PDU that does not obtain confirming and corresponding series number notice purpose ENB, source ENB also can send to purpose ENB through the sequence number (SN that the next one will be used during the RLCSDU framing) that " RLC context transfer " message handle is used for Next RLC PDU.The RLCSDUs 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.Identical with 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; It is to send through 502 resource request message that source ENB transmission RLC PDUs gives other a kind of 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.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 " switch and accomplish " 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 that message is given 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 at the retransmission method of Iur is, RLC PDUs through control plane " RLC context transfer " message perhaps " resource request " message send to purpose ENB.RLC SDUs sends through 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 through 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 through user plane.

The second method of data forwarding is that RLC SDUs and RLC PDUs send through 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 combine Fig. 5 to explain.Here stress with first method to be the difference of foregoing description.RLC PDUs sends to purpose ENB through 507 " RLC context transfer " message or 502 " resource request " message of control plane.RLC SDUs sends through " SDU data forwarding " message of 506b step, comprises SDU container in the message.Corresponding RLC PDUs is the method through 507RLC context transfer forwards, and " SDU data forwarding " and " RLC context transfer " can be separate message, also can be a piece of news.If separate message, 505 do not have absolute sequencing with 506b.If a piece of news is like " SDU data forwarding "; Comprise SDU container, PDU and corresponding series number that each does not obtain confirming in the 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, 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 need not set up the user plane of Iur interface, so purpose ENB need not distribute user plane sign that Iur interface user data transmits like TEID.

The third method of data forwarding is that RLC SDUs and RLC PDUs send through 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 combine Fig. 5 to explain.Here stress difference with first method.The user plane that RLC PDUs and RLC SDUs set up through 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 through being provided with in the packet header of data.The RLC contextual information does not obtain the corresponding SN of RLC PDU that confirms like the SN that is used for next RLC PDU with each; (SN has the same order with PDU; So be man-to-man relation) can send to purpose ENB through 502 " resource request ", also can send to purpose ENB through " RLC context transfer " message of 507.Transmitting SN (each do not obtain confirm the corresponding SN of RLC PDU), to give other a kind of method of purpose ENB be the field of definition 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 through 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 that RLC PDU is corresponding and do not have segmentation through user plane, corresponding this method, and the signaling process that UE moves between two ENB combines Fig. 5 to explain.Here stress difference with first method.The user plane that RLC SDUs sets up through 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 through 502 " resource request " like the SN that gives next RLC PDU, also can send to purpose ENB through " RLC context transfer " message of 507.

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 is explained in above-mentioned description to each method.

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

601ENB receives 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 the sub-district under the same ENB to UE, 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; 605ENB sends 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 RNC be that UE assigned radio resource situation is told purpose RNC through resource request in the source, rather than directly uses UE professional Qos directly to tell purpose RNC.606 source ENB wait-for-responses.

Corresponding method of sending RLC PDUs through " resource request " message; Also comprise RLC PDU and corresponding series number that each does not obtain confirming (NACK) in " resource request " message, can also comprise the SN (SN that the next one will be used during RLC SDU framing) that is used 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 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 response of successful message; 609ENB preserves information; For example the user plane of purpose ENB distribution identifies (for example TEID), RRC container (corresponding RLC SDUs also is the method for sending through control plane, and the user plane sign that does not comprise purpose ENB distribution in the message is like TEID).610ENB sends " switching command " message and gives UE, comprises 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.611ENB transmits RLC SDUs through the Iur user plane of setting up and gives purpose ENB.Corresponding RLCSDUs also is the method (second method) of sending through control plane, and ENB sends RLC SDUs through control plane message 506b " SDU data forwarding " and gives purpose ENB, comprises SDUcontainer in the message.This message can be an independently message, can be the message of a merging with 507 (corresponding 612) also.612ENB sends " RLC context transfer " message and gives purpose ENB; Each RLC PDU that does not obtain confirming 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) that is used for next RLC PDU through this message in the message.ENB can use PDU container (container) obtaining not confirming that the RLC PDUs of (NACK) sends to purpose ENB through 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 when transmitting data, send " RLC context transfer " message and give purpose ENB.

If source ENB has notified UE activationary time; Source ENB will send RLC context transfer message and gives purpose ENB when activationary time will arrive; Each RLC PDU that does not obtain confirming 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 through user plane forwarding RLC PDUs and the RLC SDUs that sets up, and indicates PDU or SDU through an indicator is set.RLC contextual information such as each do not obtain confirming that corresponding SN of RLC PDU and the SN that is used for next RLC PDU can comprise in 606 resource request, can give purpose ENB through sending " RLC context transfer " message in 612 steps yet.Comprise the SN of each RLC PDU that does not obtain confirming like this in " RLC context transfer " message, can also comprise the SN (SN that the next one will be used during RLC SDU framing) that is used for next RLC PDU.Source ENB transmits SN (each do not obtain confirm the corresponding SN of RLC PDU), and to give other a kind of method of purpose ENB be the field of definition 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 through 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 that RLC PDUs is corresponding and not having segmentation in 611 steps through the user plane of setting up and gives purpose ENB.The RLC contextual information can comprise in 606 resource request like 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 through 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.

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 like TEID.615ENB sends resource release request message and gives 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 and gives 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 is as shown in Figure 7.

701ENB receives message.If 702 ENB receive next " resource request " message from another one ENB, 703ENB carries 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 and gives source ENB.And inform that through cause value the reason of source ENB failure does not for example have Radio Resource.If requested resource can be distributed, 704ENB creates the context of this UE, preserves the TEID that distributes like cell ID, UE sign, EGGSN IP address, EGGSN, protection algorithm integrallty and password, AES and password to the relevant information of this UE.The user plane sign of purpose ENB distributing user Iur data forwarding is like TEID (corresponding RLC SDUs also is the method for sending through control plane, and purpose ENB does not need the user plane sign of distributing user Iur data forwarding like TEID).Corresponding method of sending RLC PDUs and RLC contextual information through " resource request " message, ENB preserve RLC PDUs in the message, RLC PDU correspondence that each does not obtain confirming series number, be used for the SN of next RLC PDU.Corresponding first kind of data forwarding method, and RLC PDUs and RLC contextual information be the method for sending through " resource request ", and step 707,708 will not need.

705ENB sends " resource response " message and gives source ENB, informs source ENB to the resource that purpose ENB distributes, and the resource that purpose ENB distributes can send to source ENB through RRC container (container).The user plane sign that is used for data forwarding that comprises purpose ENB distribution simultaneously in " resource response " message is like TEID (corresponding RLC SDUs also is the method for sending through control plane, and the user plane sign that does not comprise purpose ENB distribution in the message is like TEID).706ENB sends " UP registration " message and registers 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 " switch and accomplish " message (710) back to send " UP registration " message from UE gives EGGSN to other a kind of method of EGGSN registration.Corresponding this method, purpose ENB sends " UP registration " message and does not have absolute sequencing for UE (711) for EGGSN and ENB transmission data in buffer.

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

Corresponding the third with the 4th kind of data forwarding method; And the method that the RLC contextual information all sends through 507 " RLC context transfer "; When ENB receives 707 " RLC context transfer " message; 708ENB preserves the RLC contextual information as being used for the SN of next RLC PDU, and each does not obtain the corresponding series number of RLC PDU confirmed.

If 710 ENB receive next " switch and accomplish " message from UE 701,711ENB processing and transmitting data in buffer is given UE.ENB abandons portion to the data of the repetition that ENB and EGGSN receive from the source simultaneously.Corresponding source ENB does not determine the method for activationary time, and 712ENB sends " resource release request " message and gives 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 the 715ENB buffer memory is received.Corresponding RLC PDUs and SDUs are the methods of transmitting through user plane (method three), and according to the indicator in the packet, ENB preserves RLC PDUs and RLC SDUs respectively.The SN that the corresponding RLC contextual information SN that for example each RLC PDU is corresponding perhaps is used for next RLC PDU is the method that sends over through the user plane data bag, and ENB preserves the RLC contextual information.Corresponding RLC SDUs also is the method for sending through control plane, and ENB only receives data and buffer memory from relative users plane such as the GTP tunnel of EGGSN.

The processing of the data cached back of purpose ENB RLC PDUs and RLC SDUs is identical with 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 is as shown in Figure 8.

801EGGSN receives 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.804EGGSN begins to send to this ENB the data of UE.EGGSN can begin when this ENB sends data, to stop to send data to the old ENB in this UE place, also can send the data of UE simultaneously to two ENB, up to when receiving the resource release request of old ENB, just stopping to send data to old ENB.

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

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

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

903 steps, UE receives message.If 904 UE receive next " switching command " message from ENB, 905UE is 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.906UE sends " switch and accomplish " message and gives ENB in new sub-district.

Figure 10 is in connection mode for UE, moves to the method two of another one ENB from an ENB.The characteristic 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, 1002ENB distributes 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.1003EGGSN sends " UP sets up response " message and gives purpose ENB.EGGSN stops to send data to the original ENB of UE, begins to send 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 through two kinds of methods.Method one: UE informs purpose ENB through 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 ENBIP address, source or source ENB sign in " UP sets up response " message.

The user plane that 1004 purpose ENB distribute the Iur interface to be used for data forwarding identifies like TEID.Purpose ENB sends that " the data forwarding request information is given source ENB, comprises user plane sign that UE sign and Iur interface is used for data forwarding in the message like TEID.After source ENB receives the data forwarding request message, preservation information, like the user plane sign, 1005 send " data forwarding response " message gives purpose ENB.Comprise each RLC PDUs that does not obtain confirming and corresponding sequence number in the message, can also comprise the sequence number that is used for the RLC PDU that the next one will send.Also comprise in the data forwarding response message and transmit the GTP sequence number that data begin and the GTP sequence number of end.1006a source ENB begins to send to purpose ENB to RLC SDUs through the user plane of setting up.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 through 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 and also do not have absolute sequencing for UE.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 like 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 and give 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 and gives source ENB; Source ENB receives the next request message from purpose ENB, after data forwarding is accomplished, discharges the resource that the Iur interface of preserving is used for data forwarding.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 and give 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 through control plane sends to purpose ENB.RLC SDUs sends through user plane such as GTP-U.This is the first method of data forwarding among the present invention, and promptly RLCPDUs transmits through control plane, and RLC SDUs transmits through user plane.

The second method of data forwarding is that RLC SDUs and RLC PDUs send through control plane.Corresponding this method, the signaling process that UE moves between two ENB combine Figure 10 to explain.Here stress with first method to be the difference of foregoing description.Corresponding this method; 1006SDU among the figure transmits step; Source ENB sends to purpose ENB to RLC SDUs in the 1006b step through " 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 through " data forwarding response " message, in " data forwarding response " message, comprises SDU container.Corresponding this method; What need special instruction is 1004 and 1005 processes that are used for request msg forwarding and data forwarding among the figure; Need not set up the user plane of Iur interface, so the user plane that purpose ENB need not distribute Iur interface user data to transmit identifies like TEID.Do not comprise this user plane sign in the request message, ENB need not preserve the user plane sign that corresponding ENB distributes.

The third method of data forwarding is that RLC SDUs and RLC PDUs send through user plane, corresponding this method, and the signaling process that UE moves between two ENB combines Figure 10 to explain.Here stress difference with first method.The user plane that RLC PDUs and RLC SDUs set up through 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 through being set.The RLC contextual information can send to purpose ENB through 1005 " data forwarding responses " as giving corresponding SN of each RLC PDU and the SN that is used for next PDU.The corresponding SN of RLC PDU that RLC contextual information such as each do not obtain confirming also can send to purpose ENB through user plane by source ENB with data itself together.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 through 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 that RLC PDU is corresponding and do not have segmentation through user plane, corresponding this method, and the signaling process that UE moves between two ENB combines Figure 10 to explain.Here stress difference with first method.The user plane that RLC SDUs sets up through 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 through 1005 " data forwarding responses " like the SN that is used for next RLC PDU.

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 is shown in figure 11.

1101ENB receives 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 1104 unavailable ENB send the response message of failure and give UE, comprise the information element reason in the failure, it is inadequate resource that cause value can be set.If this UE can insert.1105ENB creates UE context, preservation information, for example UE sign, cell ID, Qos etc.ENB distributes the descending user plane sign of Iu+ interface like TEID." UP sets up request information and gives EGGSN in the 1106ENB transmission.Comprise downlink user plane mark such as TEID in the message, ENBIP address, UE sign.The ENB wait-for-response.

The method that corresponding UE is informed purpose ENB source ENB through 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, 1108ENB preserves information, for example the user plane sign of EGGSN distribution is like TEID.1110ENB can send at this moment that " the data forwarding request information is given source ENB (as stated) and wait-for-response.1111ENB sends " switch and confirm " message and gives UE, comprises purpose ENB in the message and is the configuration of UE assigned radio resource, UE sign, new cell ID.If " the data forwarding request information was given source ENB in transmission after ENB received " UP the sets up response " message 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 " data forwarding response " message that ENB comes from the source, 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 through " data forwarding response " through 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 through one of control plane message 1006b " SDU data forwarding " method of sending 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 with the 4th kind of data forwarding method; When ENB receives 1112 " data forwarding response " message; Comprise the method for RLC contextual information like the SN of the SN of corresponding each RLC PDU that does not obtain confirming or next RLC PDU in corresponding " data forwarding response " message, 1113ENB preserves the RLC contextual information, and perhaps each does not obtain confirming the SN of RLC PDU like the SN that is used for next RLC PDU.

1114ENB receives data.If 1115 ENB receive ENB or EGGSN relative users plane such as the next user data of GTP tunnel from the source, the data that the 1116ENB buffer memory is 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 through 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 SN (SN that perhaps is used for next RLC PDU) that for example each RLC PDU is corresponding is the method that sends over through the user plane data bag, and ENB preserves the RLC contextual information.Corresponding RLC SDUs is the method for sending through control plane, and ENB only receives data and buffer memory from relative users plane such as the GTP tunnel of EGGSN.

ENB is identical with prior art to the processing of RLC PDUs and RLC SDUs, and data are carried out processing and transmitting, and to give the process of UE be not emphasis of the present invention, ignores detailed technical descriptioon here.

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

1201ENB receives 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 through 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 the RLC PDU that do not obtain confirming and the SN of correspondence in the message, can also comprise and be used for the RLCPDU sequence number that the next one will send.ENB can use PDU container (container) obtaining not confirming that the RLC PDUs of (NACK) sends to purpose ENB through the data forwarding response message.1205ENB begins to send to purpose ENB to RLC SDUs through the user plane of setting up.Corresponding RLC SDUs is the method for sending through control plane, ENB through one of control plane independently message 1006b " SDU data forwarding " send to purpose ENB to RLC SDUs.Source ENB also can also comprise SDU container in " data forwarding response ", SDU container comprises the RLCSDUs that source ENB sends to purpose ENB.

The third method that corresponding data is transmitted, source ENB gives purpose ENB in 1205 steps through user plane forwarding RLC PDUs and the RLC SDUs that sets up, and indicates PDU or SDU through an indicator is set.The corresponding SN of RLC PDU that RLC contextual information such as each do not obtain confirming can give purpose ENB in " data forwarding response " message of 1204 steps with the SN that is used for next RLC PDU.Comprise the corresponding SN of each RLC PDU that does not obtain confirming like this in " data forwarding response " message, can also comprise the SN that is used for next RLC PDU.Corresponding RLC contextual information SN that for example each RLC PDU is corresponding or the SN of next PDU also are the methods that sends over through the user plane data bag, do 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 that RLC PDUs is corresponding and not having segmentation in 1205 steps through the user plane of setting up and gives purpose ENB.The RLC contextual information is given purpose ENB like 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.

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 like 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 like 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 is shown in figure 13.

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

Corresponding EGGSN initiation source of release ENB and EGGSN be the method for the resource of UE distribution for this reason, and 1307EGGSN discharges resource, and sends " resource release request " message and give 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 from ENB, 1309 discharge corresponding resource according to request message, identify like user plane.

Corresponding this embodiment, wherein the motion flow of UE is 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.1403UE sends " handoff request " message and gives purpose ENB in new sub-district.

1404 steps, UE receives message.If 1405 UE receive next " switch and confirm " message from ENB, 1406UE is according to the Radio Resource situation resource allocation that switches the new sub-district in confirming.After resource distribution was accomplished, 1407UE 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 characteristic 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, the user plane that purpose ENB distributes the Iur interface to be used for data forwarding identified like TEID.Purpose ENB sends that " the data forwarding request information is given source ENB, comprises user plane sign that UE sign and Iur interface is used for data forwarding in the message like TEID.After source ENB received the data forwarding request message, the user plane sign was like TEID in the preservation request message, and 1503 send " data forwarding response " message gives purpose ENB.Comprise the RLC PDU and the corresponding SN that do not obtain confirming in the message, 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.ENB can use PDU container (container) obtaining not confirming that the RLC PDUs of (NACK) sends to purpose ENB through 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 to send to purpose ENB to RLC SDUs through the user plane of setting up.The resource that purpose ENB inspection needs, if Radio Resource can become the distribution of work, 1505ENB distributes the descending user plane sign of Iu+ interface like TEID, " 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 like TEID, ENB IP address distributes up user plane sign like TEID.1506EGGSN sends " UP sets up response " message and gives purpose ENB.EGGSN stops to send data to the original ENB of UE, begins to send data to new ENB.After purpose ENB receives that UP sets up response, preserve up user plane sign like TEID.The purpose ENB buffer memory user data that ENB and EGGSN receive from the source.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 like 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 and give 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 and gives source ENB; Source ENB receives the next request message from purpose ENB, after data forwarding is accomplished, discharges the resource that the Iur interface of preserving is used for data forwarding.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 and give 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 through control plane " data forwarding response " message at the retransmission method of Iur.RLC SDUs sends through user plane such as GTP-U.This is the first method of data forwarding among the present invention, and promptly RLC PDUs transmits through control plane, and RLC SDUs transmits through user plane.

The second method of data forwarding is that RLC SDUs and RLC PDUs send through control plane.Corresponding this method, the signaling process that UE moves between two ENB combine Figure 15 to explain.Here stress with first method to be the difference of foregoing description.Corresponding this method; 1504SDU among the figure transmits step; Source ENB sends to purpose ENB to RLC SDUs in the 1504b step through " 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 through " data forwarding response " message, in " data forwarding response " message, comprises SDU container.Corresponding this method; What need special instruction is 1502 and 1503 processes that are used for request msg forwarding and data forwarding among the figure; Need not set up the user plane of Iur interface, so the user plane that purpose ENB need not distribute Iur interface user data to transmit identifies like TEID.Do not comprise this user plane sign in the request message, ENB need not preserve the user plane sign that corresponding ENB distributes.

The third method of data forwarding is that RLC SDUs and RLC PDUs send through user plane, corresponding this method, and the signaling process that UE moves between two ENB combines Figure 15 to explain.Here stress difference with first method.The user plane that RLC PDUs and RLC SDUs set up through 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 through being set.The SN that the RLC PDU that RLC contextual information such as each do not obtain confirming is corresponding and can send to purpose ENB through 1503 " data forwarding responses " for the SN of next RLCPDU.The corresponding SN of RLC PDU that RLC contextual information such as each do not obtain confirming also can send to purpose ENB through user plane by source ENB with data itself together.Corresponding this method defines the field of 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 to transmit SDU, then this field does not exist.The SN that is used for next RLC PDU also can transmit through 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 that RLC PDU is corresponding and do not have segmentation through user plane, corresponding this method, and the signaling process that UE moves between two ENB combines Figure 15 to explain.Here stress difference with first method.The user plane that RLC SDUs sets up through 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 through 1503 " data forwarding responses " like the SN that gives next RLC PDU.

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

1601ENB receives 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.The user plane that distributes the Iur interface to be used for data forwarding identifies like TEID (corresponding RLC SDUs is the method for sending through control plane, and ENB need not distribute this user plane sign)." the data forwarding request information is given source ENB, and wait-for-response in the 1604ENB transmission.

If 1605 purpose ENB receive " data forwarding response " message that ENB comes from the source, 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 through " data forwarding response " through 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 through one of control plane message 1504b " SDU data forwarding " method of sending 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 with the 4th kind of data forwarding method; When ENB receives 1605 " data forwarding response " message; If comprise the SN of the RLC PDU that RLC contextual information such as each do not obtain confirming in the message or be used for the SN of next RLC PDU, 1606ENB preserves 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 is given UE, comprise the information element reason in the failure, it is inadequate resource that cause value can be set.If this UE can insert.1609ENB reservation of resource, ENB distribute the descending user plane sign of Iu+ interface like 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, 1108ENB preserves information, for example the user plane sign of EGGSN distribution is like TEID.1612ENB sends " switch and confirm " message and gives UE, comprises purpose ENB in the message and is the configuration of UE assigned radio resource, UE sign, new cell ID.

1613ENB receives data.If 1614 ENB receive ENB or EGGSN relative users plane such as the next user data of GTP tunnel from the source, the data that the 1615ENB buffer memory is 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 of sending through 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 through 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 corresponding SN (SN that perhaps is used for next RLC PDU) of RLC PDU is the method that sends over through 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, shown in figure 12 with the motion flow of source ENB in the method two.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, shown in figure 13 with the motion flow of source EGGSN in the method two.

Corresponding this embodiment, wherein the motion flow of UE is identical with the motion flow of UE in the method two, and is 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, 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 through control plane, also can transmit through user plane.If RLC PDUs transmits through user plane, each corresponding SN can transmit also and can transmit through user plane through control 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 are sent on same user plane, need in data packet head, define an indication 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 purpose ENB to UE according to " measurement report " decision of receiving from UE, and sends " resource request " message and give purpose ENB;

Purpose ENB sends " resource response " message and gives source ENB;

Source ENB sends " switching command " and gives UE;

Source ENB sends to purpose ENB to the two-layer protocol SDU that does not obtain confirming and/or do not have segmentation, and said two-layer protocol is meant the two-layer protocol that data are cut apart and merged;

Purpose ENB receives next " switch and accomplish " message from UE;

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

2. method according to claim 1 is characterized in that also comprising: source ENB sends RLC context transfer message and gives purpose ENB, and said RLC context transfer message comprises the sequence number SN that is used for next descending two-layer protocol PDU.

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

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

5. method according to claim 4 is characterized in that, the user plane sign that is used for data forwarding that comprises information element purpose ENB distribution in the said resource response message is the terminal sign in tunnel.

6. method according to claim 1 and 2 is characterized in that, comprises information element RRC container in the said resource response message, wherein, comprises purpose ENB in the RRC container and is the configuration of UE assigned radio resource.

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

8. method according to claim 7 is characterized in that the information element EGGSN that comprises in said " 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 moves between two ENB, comprises step:

Purpose ENB sends " resource response " message and gives source ENB;

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

Source ENB sends " switching command " and gives UE;

Purpose ENB receives next " switch and accomplish " message from UE.

10. method according to claim 9 is characterized in that also comprising: source ENB sends RLC context transfer message and gives purpose ENB, and said RLC context transfer message comprises the sequence number SN that is used for next descending two-layer protocol PDU.