CN102883380B

CN102883380B - Method for supporting user equipment transferability in LTE system

Info

Publication number: CN102883380B
Application number: CN201210347835.5A
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: 2017-06-09
Anticipated expiration: 2026-03-29
Also published as: CN102883380A; CN1933663A; CN1933663B

Abstract

UE mobility methods are supported in a kind of LTE system, wherein, UE is moved between two ENB, including step：Source ENB according to received from UE " measurement report " determines that UE will be switched to the cell of another purpose ENB, and sends " resource request " message and give purpose ENB；Purpose ENB sends " resource response " message and gives source ENB, and the resource of distribution is sent into source ENB；Purpose ENB sends " UP registrations " message and is registered to EGGSN；Source ENB sends " switching command " to UE；Purpose ENB receives " switching is completed " message come from UE.This invention ensures that data are not lost when UE is moved between two ENB, and solve forwarding problems of the data between two ENB.It is of the invention simple, reliable, efficient.

Description

Method for supporting user equipment transferability in LTE system

The application is to submit to the entitled of China Intellectual Property Office on March 29th, 2006 " to support user in LTE system The divisional application of the method for equipment mobility " application for a patent for invention 200610067459.9.

Technical field

The present invention relates to third generation Partnership Program (hereinafter referred to as 3GPP) propose GSM Long Term Evolution (below Abbreviation LTE) method for supporting user equipment transferability in system.

Background technology

Existing third generation Partnership Program (hereinafter referred to as 3GPP) structure is as shown in Figure 1.Here is to Fig. 1 3GPP systems The description of structure.

101 user equipmenies (hereinafter referred to as UE) are the terminal devices for receiving data.102 NodeB are radio networks (abbreviation RNS) is responsible for the wireless node for transmitting/receiving in system.103 controlling radio network controllers (hereinafter referred to as CRNC) are direct Control the radio network controller of NodeB.Interface between RNC and UE is referred to as air interface.104 service wireless network controllers (hereinafter referred to as SRNC) is the radio network controller (hereinafter referred to as RNC) for controlling carrying information, such as wireless heterogeneous networks (below Abbreviation RRC) state.105 gateway general packet radio services (hereinafter referred to as GPRS is GPRS) supporting node (hereinafter referred to as Gateway GPRS Support Node is GGSN) and 106 Serving GPRS Support Nodes (hereinafter referred to as SGSN) are the biography of data Defeated offer route.Interface between SGSN and RNC is Iu interfaces.107 E-PDN are outside public data networks, there is provided data Source.

After existing GGSN receives user data, by being before the user plane of user correspondence business foundation, pass through GTP-U sends data to SGSN, after same SGSN receives data, RNC is sent data to by GTP-U.User data is in RNC Treatment combination Fig. 2 with Node B is discussed in detail.

Fig. 2 is existing radio interface protocol architecture.Existing air interface is divided into three layers：205 physical layers (L1), number According to link layer (L2) and Internet (L3).L2 is divided into sublayer：204 medium educations (hereinafter referred to as MAC), 203 radio chains Road control (hereinafter referred to as RLC), 201 grouped data Convergence Sublayers (hereinafter referred to as PDCP) and 202 broadcast group broadcasts control (letter below Claim BMC).202 BMC are only just useful when broadcasting service is processed, and not will be described in detail here.Ellipse in figure encloses and is Service Access point (hereinafter referred to as SAP), for being communicated end to end between sublayer.SAP between 204 MAC and physical layer is transmission Channel.SAP between RLC and MAC is logic channel.PDCP and BMC are accessed by PDCP and BMC SAP respectively.What L2 was provided Business is referred to as radio bearer (hereinafter referred to as RB).206 wireless heterogeneous networks (hereinafter referred to as RRC) can to PDCP, BMC, RLC, MAC and physical layer are configured, and are the functions of control plane.PDCP and BMC are the function of user plane.RLC is flat in control As face is with the function of user plane.

From SGSN come packet domain user data reach RNC after, first by 201 PDCP data are carried out head compression (on Behavior is decompressed).Another function of PDCP is to ensure not lose the service wireless network controller of data (hereinafter referred to as SRNC) relocate.Then processed by 203 RLC entities.The function of RLC is framing (split and merge), automatic repetition please Ask (hereinafter referred to as ARQ) and encryption.204MAC layers is divided into different network entities, is not described in detail here.The function of MAC layer It is mixing ARQ (hereinafter referred to as HARQ), Stochastic accessing control, transport format combination selection, UE identifications and logic channel and transmission The mapping of channel.The function of 205 physical layers is to send and receive radio frames, Power Control etc..The function of physical layer is in Node B Realize.Data are the Frame Protocol (hereinafter referred to as FP) by transmission channel between RNC and Node B come what is transmitted.

In existing system, UE (does not relocate) mobile between NodeB or between RNC when, by soft handover, Not losing for data can be ensured.Because there is strict synchronized relation, network is surveyed and UE is surveyed while new link is activated, Deactivate (deactive) old link, it is ensured that Seamless Mobile.

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

301 source RNC determine to perform SRNS repositioning process.302 source RNC send " reorientation demand " to original SGSN. Comprising information elements such as source mark, purpose marks in message.It is same from the point of view of purpose mark after SGSN originally receives this message The reorientation between reorientation or SGSN in one SGSN.If the reorientation between SGSN, SGSN originally is initiated Reorientation resource allocation process.303 original SGSN send " forwarding re-positioning request " to new SGSN.Forwarding re-positioning request Just used when only being relocated between SGSN.304 new SGSN send " re-positioning request " to Target RNC, in Target RNC and newly SGSN between set up RAB (hereinafter referred to as RAB).When the resource that RAB needs includes the resource success of user plane After distribution, Target RNC sends " re-positioning request confirmation " message to new SGSN.The RAB that each is set up includes information transfer Layer address (the purpose RNC addresses of user data) and Iu transmission relations are (to the down going channel end mark (letter below of user data Claim TEID)).305 distribute data transmission resources and new SGSN gets out SRNS reorientations as purpose RNC and new SGSN When, new SGSN sends " forwarding relocation response " to original SGSN.This message indicative purpose RNC is ready to be connect from source SRNC Receive the descending PDU of forwarding.Reorientation resource allocation process is successfully completed.Forwarding relocation response resetting between SGSN Just used during position.After SGSN originally receives this message, 306 transmission " resetting order of the bit " message give source RNC.Wrapped in message Containing need release RAB and need forward data RAB, SGSN be based on Qos come decide whether forward data.Need Forward the RAB information of data should be comprising RAB marks, transport Layer address and Iu transmission relations.Transport Layer address and Iu are transmitted What relation and purpose RNC were sent to new SGSN by " re-positioning request confirmation " message is the same.Under these parameters are used for Row network protocol data unit (hereinafter referred to as N-PDU) is from source SRNC to purpose RNC by the forwarding of Iu interfaces.Forwarding is served only for Descending user data.SRNC is now ready for the forwarding of down user data.307 are based on forwarding data the need for Qos is determined RAB, source RNC starts replicate data and is sent to Target RNC by Iu interfaces.For each using not losing PDCP The radio bearer of (loss PDCP), GTP-PDU (but corresponding PDCP-PDUs has sent has been not yet acknowledged) is answered Make and Target RNC is sent to by network protocol layer (hereinafter referred to as IP layers).Source RNC continue to send descending replicate data and Receive upstream data.Before the role of Serving RNC is replaced by purpose RNC, when descending user plane data starts to reach purpose RNC, purpose RNC can cache or be discarded into the descending GTP-PDUs for reaching according to Qos attributes.

The step of step 7, the order of event is not necessarily reflected.For example, source RNC may be while 307 start to turn Hair data and 308 send " reorientation is submitted to " message, unless 307 triggerings 308.Target RNC may simultaneously send " reorientation inspection Survey " and " UE mobile messages ", therefore the RNC of 310 mesh, when may receive " confirmation of UE mobile messages ", 307 data forwardings are still being entered OK

308 source RNC send " reorientation is submitted to " to Target RNC, and the process is used to transmit SRNS contexts to Target RNC, And the role of SRNS is from source RNC converting into target RNC.SRNS contextual informations about RAB are all sent, comprising up-downgoing Next GTP-PDU sequence numbers to be sent, and next PDCP sequence numbers for sending and receiving data to UE.It is right In order transmission PDP Context is not required, next GTP-PDUs for being sent is not used in purpose RNC.PDCP sequence numbers Just sent by source RNC during only for using the radio bearer for not losing PDCP.

309 when Target RNC receives the triggering message that reorientation is performed, and Target RNC sends " reorientation detection " message and gives New SGSN.Afterwards, Target RNC starts to exercise the role of service wireless network controller (hereinafter referred to as SRNC).310 UE and Such as Target RNC exchanges mobile related information, the mark of new SRNC, and mark and uplink user data of the band of position etc. exist Exchanged between UE and Target RNC.

After 311 target SRNC receive " confirmation of UTRAN mobile messages " message, reorientation complete process, purpose RNC hairs are initiated " reorientation is completed " message is sent to new SGSN.Reorientation complete process is used to notify the completion of CN SRNS repositioning process.Such as Fruit repositioning process is the process between different SGSN, and it is original that 312 new SGSN send " forwarding reorientation is completed " message informing SGSN SRNS repositioning process completion.SGSN originally sends response message " forwarding reorientation completes to confirm " message and gives New SGSN.After receiving reorientation completion message, user plane is switched to purpose RNC by SGSN from source SRNC.If 311 SRNS Reorientation is the SRNS reorientations between different SGSN, after new SGSN receives " reorientation is completed " message, new SGSN hairs Send and " update PDP Context request information to corresponding GGSN, GGSN updates packet data protocol (hereinafter referred to as PDP) context And return to " updating PDP Context response " message.

The repositioning process that SGSN is received between reorientation completion message or difference SGSN receives forwarding reorientation and completes During message, 313 old SGSN send Iu release command messages and give source SRNC.Between source of release RNC and source SGSN Iu connection and User resources.

If it is original that 314 new Routing Areas represent that (hereinafter referred to as RAI) is different from, it is updated that UE initiates route location Journey.

C1, C2 and C3 perform the application process (abbreviation CAMEL) of the property of enhancing mobile network, and detailed skill is ignored here Art content.

Here it is to tell about the data forwarding in repositioning process by taking the SRNS repositioning process that UE is not related to as an example, it is right In the direct-cut operation and SRNS repositioning process that merge, air interface has some to distinguish, and the forwarding of SRNS contexts is connect by Iu What mouth was carried out, rather than by Iur interfaces.But data forwarding is the same.

Existing 3GPP system structure has that upgradability is poor, and call set-up time is long, and system architecture complexity etc. is many to be lacked Point, therefore 3GPP standardization bodies are carrying out the standardization effort of LTE.For the demand of LTE, each company is proposed uncommon The LTE system structure of prestige, the LTE system structure that one of which is proposed is as shown in Figure 4.Such as the function and NodeB of original RNC are closed Into a network entity (referred to herein as ENB 402), the function of SGSN and GGSN together into a network entity (here Referred to as EGGSN 403).Wherein packet data compression protocol (hereinafter referred to as PDCP) is the function of original RNC, also may be used in LTE To be placed on EGGSN.So simplify system by reducing network node, reduce the time delay of system.Wherein 401 UE and 404 E- PDN is identical with Fig. 1 101 and 107 respectively.

In LTE system, many companies propose to simplify RLC and MAC functions, and such as RLC and MAC have segmentation and contact Function, only retain a, the function of all propositions RLC and MAC can be closed in a layer, just no rlc layer.

In the new LTE system structure for proposing, PDCP is located at EGGSN, RLC (or MAC, refer here to carry out data Segmentation and the user plane two-layer protocol of series winding) it is located at ENB.When UE is moved between two ENB, a part of RLC SDU are Through being divided PDU, it is existing protocol open question that these data (PDU, SDU) how are transmitted between two ENB.

In the present invention for convenience, we still continue to use the concept of RLC, refer to being located at ENB, first have to logarithm Can be a part of RLC, or MAC according to the two-layer protocol split and merged.If future, RLC and MAC was closed Together, the function of the MAC layer for referring to just, such as MAC PDU, MAC SDU.This will not influence main contents of the invention.

The content of the invention

It is an object of the invention to provide a kind of method between two ENB by transmitting RLC PDU and RLCSDU, protecting In the case that card data are not lost, efficiency of transmission is improve, save system resource.

To achieve the above object, UE mobility methods are supported in a kind of LTE system, wherein, UE is moved between two ENB It is dynamic, including step：

Source ENB according to received from UE " measurement report " determines that UE will be switched to the cell of another purpose ENB, concurrently " resource request " message is sent to give purpose ENB；

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

Purpose ENB sends " UP registrations " message and is registered to EGGSN；

Source ENB sends " switching command " to UE.

This invention ensures that data are not lost when UE is moved between two ENB, and solve data between two ENB Forwarding problems.It is of the invention simple, reliable, efficient.

Brief description of the drawings

Fig. 1 is existing 3GPP system structure；

Fig. 2 is existing radio interface protocol architecture；

Fig. 3 is existing SRNS repositioning process；

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

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

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

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

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

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

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

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

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

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

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

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

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

Specific embodiment

The method that UE is moved between two ENB is told about in the present invention by taking the LTE system structure of Fig. 4 as an example, referred to here as Interface between ENB and UE is air interface (hereinafter referred to as Uu), i.e., the interface of original RNC and UE.Between ENB and EGGSN Interface is Iu+ interfaces (interface between originally RNC and SGSN is Iu interfaces).Interface between ENB is Iur interfaces.The present invention The retransmission method for focusing on Iur interface data, if the system architecture of LTE in future is changed, such as EGGSN is divided into control Two network entities of plane and user plane, the invention is equally applicable.

Fig. 5 is that UE is in connection mode, and the method one of another ENB is moved to from ENB.The method is characterized in Before the cell that UE is really switched to new, there is a process for preparing Radio Resource in advance.

Based on the measurement of source ENB configurations, 501 UE send " measurement report " message and give source ENB, the result of measurement, such as phase The information of adjacent cell is reported and gives source ENB.According to the measurement result that UE is reported, if source ENB determines UE to move to another The cell of ENB (purpose ENB), 502 source ENB send " resource request " message and give purpose ENB.Mark comprising purpose cell in message Know, UE marks, UE need the Qos information of access service, current UE to connect the tunnel end of the IP address of EGGSN, EGGSN distribution End identifies (hereinafter referred to as TEID) (for the up TEID between source ENB and EGGSN), protection algorithm integrallty and password, adds Privacy protection algorithm and password.Wherein source RNC can also source RNC be UE distribution Radio Resource situation by resource request accuse Tell purpose RNC, rather than directly UE directly tell purpose RNC using the Qos of business.Purpose ENB receives resource request and disappears Breath, parameter (such as Qos or radio resource configuration parameters) configuration resources of the ENB in request message, if the money of request Source can be distributed, and ENB creates the context of this UE, the relevant information of this UE preserve as cell ID, UE mark, EGGSN IP address, user plane mark (such as TEID) of EGGSN distribution, protection algorithm integrallty and password, AES and Password.User plane mark (such as TEID) of purpose ENB distributing user Iur data forwardings.503 ENB send " resource response " Message gives source ENB, and the resource that purpose ENB is distributed is sent to source ENB, and the Radio Resource of purpose ENB distribution can be by RRC Container (container) is sent to source ENB.Turn for data comprising what purpose ENB was distributed in " resource response " message simultaneously User plane mark (such as TEID) of hair.If purpose ENB can not distribute corresponding resource, purpose ENB sends the sound of failure Answer message to give source ENB, information element reason is included in the response message of failure, the reason for source ENB fails is informed by cause value For example without Radio Resource.Purpose ENB can now receive up data.If purpose ENB distribution resource successes, 504 Purpose ENB sends " UP registrations " message and is registered to EGGSN.Downlink user plane mark comprising new ENB distribution in message is such as TEID, UE are identified and new ENB IP address.At this moment EGGSN can start to send data to purpose ENB.The message can also EGGSN is sent to after 508 " switching is completed " message come from UE are received.

Source ENB receives successful resource response message, preserves user plane mark such as TEID.505 source ENB send " switching UE is given in order ", and the new Radio Resource that purpose ENB is distributed is notified UE by this message.Source ENB can also determine an activation Time, UE is sent to by " switching command ", such network and UE are switched to new cell in activationary time.506a sources ENB leads to The Iur user planes having built up are crossed to start RLC SDU to be sent to purpose ENB.Here RLC SDU refer to not to be segmented RLC SDU, or the RLC not all being confirmed without the RLC SDU being segmented and by segmentation but all of segmentation SDU.507 source ENB send " RLC context transfers " message and give purpose ENB, and each is not confirmed by the message (NACK) RLC PDU and corresponding series number is sent to purpose ENB.If including those in the RLC SDU of above-mentioned forwarding By the RLC SDU that segmentation but all segmentations are not all confirmed, then do not wrapped in the RLC PDU not being confirmed here Those PDU that one SDU containing correspondence is not confirmed.Can also be comprising for next in " RLC context transfers " message Individual RLC PDU sequence numbers (next SN during RLCSDU framing).Also comprising forwarding in RLC context transfer message GTP sequence numbers that GTPPDU starts and the GTP sequence numbers for terminating, by the two information elements, purpose ENB can simultaneously from The data that source ENB and EGGSN are received abandon a.Wherein 505,506a and 507 are without absolute sequencing, such as source ENB Data forwarding can first be started, while sending " switching command " to UE.If source ENB is notified of UE activationary times, source ENB is swashing RLC context transfers message is sent when live time will arrive and gives purpose ENB, the RLC PDU that each is not confirmed And corresponding series number notifies purpose ENB, source ENB can also be by " RLC context transfers " message for next The sequence number (next SN during RLC SDU framing) of RLC PDU is sent to purpose ENB.Purpose ENB cachings are received RLC SDUs.Purpose ENB preserves the RLC contextual informations for receiving, and caches the RLC PDUs for receiving.Purpose ENB can be cached RLC SDUs preserve RLC PDUs in the caching for resending in the caching for sending.On purpose ENB to data after Continuous treatment is same as the prior art and be not emphasis of the invention, and detailed technology explanation is ignored here.

The method that corresponding source ENB does not determine activationary time, source ENB send RLC PDUs to purpose ENB another The resource request message that method can be by 502 sends, and is not obtained comprising each also in " resource request " message so Confirm the PDU and corresponding series number of (NACK), sequence number (the RLC SDU for next RLC PDU can also be included Next SN during framing).Step 507 need not.

After UE receives 505 switching commands, new cell is moved to.If also including activationary time in switching command, UE exists Activationary time is switched to new cell.Then 508UE sends " switching is completed " message and gives purpose ENB.If source ENB determines sharp Live time, when activationary time arrives, source ENB release Radio Resources, and the process of resource between release and EGGSN is initiated, such as scheme Shown in 509 steps.If after source ENB does not determine that activationary time, purpose ENB receive 508 handoff completion messages, sending messages to source ENB asks the release of resource, source ENB release Radio Resources, and initiates the process of resource between release and EGGSN.Can also be by Purpose ENB initiates the process of release EGGSN resources.

In the above-mentioned description to Fig. 5, user data is that RLC PDUs are by control plane in the retransmission method of Iur " RLC context transfers " message or " resource request " message are sent to purpose ENB.RLC SDUs be by user plane such as GTP-U sends.This is the first method of data forwarding in the present invention, i.e. RLC PDUs (the RLC PDUs not being confirmed Or remove those RLCPDUs that one SDU of correspondence is not confirmed in the RLC PDUs not being confirmed) pass through Control plane is forwarded, RLC SDUs (refer to the RLC SDU not being segmented, or without the RLC SDU being segmented and by segmentation But it is all of to be segmented the RLC SDU not all being confirmed) forwarded by user plane.

The second method of data forwarding is that RLC SDUs and RLC PDUs are sent by control plane.Here RLC The concept of SDUs and RLC PDUs is identical with first method.This method of correspondence, the signaling flow that UE is moved between two ENB Journey combination Fig. 5 is illustrated.Here stress and the first method i.e. difference of foregoing description.RLC PDUs pass through control plane 507 " RLC context transfers " message or 502 " resource request " message be sent to purpose ENB.RLC SDUs are walked by 506b Rapid " SDU data forwardings " message is sent, and SDU container are included in message.Correspondence RLC PDUs are by 507 RLC The method that hereafter Transfer Message is forwarded, " SDU data forwardings " and " RLC context transfers " can be single message, it is also possible to It is a piece of news.If single message, 505 and 506b does not have absolute sequencing.If a piece of news such as " SDU Data forwarding ", includes SDU container, each PDU not being confirmed and corresponding series number, also in message The sequence number (next SN during RLC SDU framing) for next RLC PDU can be included, 507 steps are not deposited .502 and 503 are served only for asking the process (or also including PDUs and SN information) of purpose ENB distribution resources in Fig. 5, are not required to The user plane of Iur interfaces is set up, so purpose ENB need not distribute the user plane mark of Iur Interface User data forwardings Know such as TEID.

The third method of data forwarding is that RLC SDUs and RLC PDUs are sent by user plane, here RLC The concept of SDUs and RLC PDUs is identical with first method.This method of correspondence, the signaling flow that UE is moved between two ENB Journey combination Fig. 5 is illustrated.Here the difference with first method is stressed.RLC PDUs and RLC SDUs pass through 502 and 503 The user plane that step is set up, purpose ENB is given in 506c steps forwarding RLC SDUs and RLC PDUs.In the packet header of data In indicate RLC PDU or RLCSDU by setting indicator (indicating bit).RLC contextual informations are such as used for The SN of next RLC PDU SNs corresponding with the RLC PDU that each is not confirmed, (SN have with PDU as order, So being man-to-man relation) purpose ENB can be sent to by 502 " resource requests ", it is also possible to by 507 " RLC is upper and lower Text transfer " message is sent to purpose ENB.Purpose ENB is given in transmission SN (the corresponding SN of RLCPDU that each is not confirmed) Another method be in the packet define SN field.Order includes mono- corresponding RLC of a SN in the packet The corresponding RLC PDU of PDU, SN mono-.The field is optional.If for transmitting SDU, the field does not exist.With Can also be transmitted by user plane in the SN of next RLC PDU, if so user-plane transmissions are RLC SDU, There is a field of SN in the packet.

4th kind of method of data forwarding is only to forward not being confirmed the corresponding RLC of RLCPDU by user plane The SDUs and RLC SDUs without segmentation, this method of correspondence, signaling process combination Fig. 5 that UE is moved between two ENB Explanation.Here the difference with first method is stressed.RLC SDUs are put down by the user that 502 and 503 steps are set up Face, purpose ENB is given in 506a steps forwarding SDUs.RLC contextual informations can be by 502 such as the SN to next RLC PDU " resource request " is sent to purpose ENB, it is also possible to be sent to purpose ENB by 507 " RLC context transfers " message.

In following descriptions to node device action specification, be also with the first data forwarding method (PDUs control planes, SDUs user planes) come what is described.Other data forwarding methods of correspondence place different from the first will particularly point out.Wherein The concept of RLC PDU and RLC SDU has been described above in the above-mentioned description to each method.

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

601 ENB receive message.If 602 receive the measurement report come from UE.According to measurement report information, 603ENB determines It is fixed whether UE to be moved to the more preferable cell of other signals.If it is determined that UE is moved to the cell under same ENB, then perform Handoff procedure in same ENB, is not here emphasis of the invention, ignores specific description.604 if difference ENB it Between handoff procedure, 605 ENB send " resource request " message to the ENB where purpose cell, in message include purpose cell Mark, UE mark, UE need the Qos information of access service, current UE connect the IP address of EGGSN, EGGSN distribute tunnel Road end mark (hereinafter referred to as TEID) (for up TEID between source ENB and EGGSN), protection algorithm integrallty and close Code, encipherment protection algorithm and password.Wherein source RNC can also source RNC be UE distribution Radio Resource situation pass through resource Request tell purpose RNC, rather than directly UE directly tell purpose RNC using the Qos of business.606 source ENB are waited and rung Should.

The method that correspondence sends RLC PDUs by " resource request " message, each is also included in " resource request " message The RLC PDU and corresponding series number of (NACK) are not confirmed, the SN for next RLC PDU can also be included (next SN during RLC SDU framing).So step 612 need not.

If 607 ENB receive " resource response " message come from another ENB in 601.608 if the response of failure Message, such as inadequate resource, ENB will not continue to perform the process for being switched to the cell.If successful response message, 609 ENB preserves information, user plane mark (such as TEID) of such as purpose ENB distribution, RRC container (correspondence RLC SDUs is also the method sent by control plane, and the user plane not comprising purpose ENB distribution in message is identified such as TEID).610 ENB send " switching command " message to UE, the wireless money distributed comprising purpose cell ID, new cell in message Source (i.e. purpose ENB is sent to the RRC container of the ENB).ENB can also determine swashing for the new cell configuration of application Live time, network and UE are surveyed and are switched to new cell in activationary time simultaneously, and this method of correspondence is gone back in " switching command " message Comprising activationary time.611 ENB forward RLC SDUs to give purpose ENB by the Iur user planes set up.Correspondence RLCSDUs It is the method (second method) sent by control plane, ENB is sent out by control plane message 506b " SDU data forwardings " Send RLC SDUs to give purpose ENB, SDUcontainer is included in message.The message can be an independent message, it is also possible to It is a message for merging with 507 (correspondences 612).612 ENB send " RLC context transfers " message and give purpose ENB, by this Each RLC PDU for not being confirmed at present and corresponding series number are notified purpose ENB by message, can be with message Comprising the SN (next SN during RLC SDU framing) for next RLC PDU.ENB can use PDU container The RLC PDUs for not being confirmed (NACK) are sent to purpose ENB by (container) by RLC context transfer message.On RLC Hereafter also comprising the GTP sequence numbers for starting and the GTP sequence numbers of end in Transfer Message.

610th, 611 and 612 without absolute sequencing, and such as ENB can send out while purpose ENB is forwarded data to " switching command " message is sent to UE, it is also possible to " RLC context transfers " message is sent while data are forwarded and gives purpose ENB.

If source ENB is notified of UE activationary times, source ENB sends RLC context transfers when activationary time will arrive Message gives purpose ENB, and the RLC PDU that each is not confirmed and corresponding series number notify purpose ENB, in message The SN (next SN during RLC SDU framing) for next RLC PDU can also be included.

The third method of corresponding data forwarding, source ENB forwards RLC PDUs in 611 steps by the user plane set up Purpose ENB is given with RLC SDUs, PDU or SDU is indicated by setting an indicator.RLC contextual informations are as often One is not confirmed the corresponding SN of RLC PDU and the SN for next RLC PDU and can be wrapped in 606 resource request Contain, it is also possible to give purpose ENB by sending " RLC context transfers " message in 612 steps.So " RLC context transfers " disappears SN comprising each RLC PDU not being confirmed in breath, can also include the SN (RLC for next RLC PDU Next SN during SDU framing).Source ENB transmits SN (the corresponding SN of RLC PDU that each is not confirmed) to mesh ENB another method be in the packet define SN field, in the packet order include mono- correspondence of a SN RLC PDU, the corresponding RLC PDU of SN mono-.The field is optional.If for transmitting RLC SDU, the field Do not exist.SN for next RLC PDU can also be transmitted by user plane, if so user-plane transmissions are RLC SDU, in the packet in the presence of a field of SN.

4th kind of method of corresponding data forwarding, source ENB is forwarded by the user plane set up in 611 steps and not obtained Confirm that RLC PDUs corresponding RLC SDUs and the RLC SDUs without segmentation give purpose ENB.Under RLC contextual informations are such as used for One SN of RLC PDU (next SN during RLC SDU framing) can include in 606 resource request, it is also possible to In 612 steps purpose ENB is given by sending " RLC context transfers " message.Comprising use so in " RLC context transfers " message In the SN of next RLC PDU.

The correspondence ENB methods that do not determine activationary time, if 613 ENB receive from purpose ENB come " resource release please Ask " message, 614 ENB release resources, including Radio Resource, UE contexts, user plane mark such as TEID.Then 615 ENB Resource Release Request message is sent to EGGSN.Discharge EGGSN resources process can also be initiated by purpose ENB, correspondence it is this by The method that purpose ENB is initiated, step 615 does not exist.

The method that correspondence ENB determines activationary time, ENB discharges resource, including wireless money when activationary time arrives Source, UE contexts, TEID.Then ENB sends Resource Release Request message to EGGSN.The process for discharging EGGSN resources can also Initiated by purpose ENB.

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

701 ENB receive message.If 702 ENB receive " resource request " message come from another ENB, 703 ENB Parameter (such as Qos or radio resource configuration parameters) in request message performs Access Control.If resource cannot Distribution, performs 709 steps, and the response message that ENB sends failure gives source ENB.And the reason for source ENB fails is informed by cause value For example without Radio Resource.If the resource of request can be distributed, 704 ENB create the context of this UE, the correlation of this UE Information preserves the TEID distributed such as cell ID, UE marks, EGGSN IP address, EGGSN, protection algorithm integrallty and close Code, AES and password.The user plane mark of purpose ENB distributing user Iur data forwardings such as TEID (correspondence RLC SDUs It is also the method sent by control plane, purpose ENB does not need the user plane mark of distributing user Iur data forwardings such as TEID).The method that correspondence sends RLC PDUs and RLC contextual informations by " resource request " message, ENB is preserved in message RLC PDUs, each the corresponding series numbers of RLC PDU not being confirmed, the SN for next RLC PDU.Correspondence the A kind of data forwarding method, and RLC PDUs and RLC contextual informations are the method sent by " resource request ", step 707th, 708 need not.

705ENB sends " resource response " message and gives source ENB, and the resource that purpose ENB is distributed is informed source ENB, purpose ENB The resource of distribution can be sent to source ENB by RRC container (container).Mesh is included in " resource response " message simultaneously ENB distribution for data forwarding user plane mark as TEID (correspondence RLC SDUs be also to be sent out by control plane The method sent, user plane mark such as TEID not comprising purpose ENB distribution in message).706 ENB send " UP registrations " message Registered to EGGSN.Descending TEID, UE mark and new ENB IP address distributed comprising new ENB in message.At this moment EGGSN can send data to purpose ENB.ENB to another method that EGGSN is registered is received from UE in purpose ENB " switching is completed " message (710) come sends " UP registrations " message to EGGSN afterwards.This method of correspondence, purpose ENB sends " UP Registration " message sends the data for caching to UE (711) without absolute sequencing to EGGSN and ENB.

If 707 ENB are received from another ENB next " RLC context transfers " message 701,708ENB preserves what is received RLC contextual informations, the PDU that for example each is not confirmed and corresponding series number, for next RLC PDU's SN, GTP sequence numbers and the GTP sequences of end that forwarding data start.Correspondence RLC SDUs are also to be sent by control plane And the method sent by a piece of news with RLC contextual informations, ENB preserves the RLC SDUs for receiving.Correspondence is by " money The method that source request information sends RLC PDUs and RLC contextual information, RLC SDUs are sent by control plane, ENB is preserved RLC SDUs in message.Correspondence RLC SDUs are also to be sent by control plane and with RLC contextual informations by only Vertical message is come the method that sends, if ENB receives 506b " SDU data forwardings " message, ENB preserves the RLC SDUs for receiving.

Correspondence the third and the 4th kind of data forwarding method, and RLC contextual informations be all by 507 " RLC is upper and lower Come the method that sends, when ENB receives 707 " RLC context transfers " message, 708 ENB preserve RLC contextual informations for text transfer " Such as it is used for the SN of next RLC PDU, and each corresponding series number of RLC PDU for not being confirmed.

If 710 ENB are received from UE next " switching is completed " message 701,711 ENB are processed and are sent the data of caching To UE.ENB abandons the data of the repetition for being received from source ENB and EGGSN simultaneously a.When corresponding source ENB does not determine activation Between method, 712ENB send " resource release request " message give source ENB.

713 steps, ENB receives data.714 receive number from the relative users plane such as GTP tunnel of ENB or EGGSN According to rear, the data that 715 ENB cachings are received.Correspondence RLC PDUs and SDUs are the method (sides forwarded by user plane Method three), the indicator in packet, ENB preserves RLC PDUs and RLC SDUs respectively.Correspondence RLC contextual informations For example each corresponding SN of RLC PDU or the SN for next RLC PDU are transmitted across by user plane data bag The method come, ENB preserves RLC contextual informations.Correspondence RLC SDUs are also the method sent by control plane, and ENB is only Data are received from the relative users plane such as GTP tunnel of EGGSN and is cached.

The treatment of the data cached rear RLC PDUs and RLC SDUs of purpose ENB is same as the prior art, and one is entered to data Step treatment and the process for being sent to UE are not emphasis of the invention, and detailed technology explanation is ignored here.

The motion flow of this embodiment of correspondence EGGSN is as shown in Figure 8.

801 EGGSN receive message.If 802 receive " UP registrations " message come from ENB, 803 EGGSN update corresponding The contextual information of UE, the user plane for preserving descending new ENB distribution identifies the IP address of such as TEID and ENB.804 EGGSN starts to send the data of UE to this ENB.EGGSN can start to stop while sending data to this ENB to where this UE Old ENB sends data, it is also possible to while the data of UE are sent to two ENB, please until being discharged in the resource for receiving old ENB Just stop sending data to old ENB when asking.

If 805 EGGSN are received from ENB next resource release request 801,806 EGGSN discharge according to request message Corresponding resource, such as TEID.

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

901 steps, UE is measured according to the measurement of ENB configuration.902 configure according to measurement, and UE sends " measurement report " Such as message the cycle or time triggered to ENB.The result of measurement is reported to ENB.

903 steps, UE receives message.If 904 UE receive " switching command " message come from ENB, 905 UE are according to cutting The Radio Resource situation configuration resource of the new cell changed in order.If resource is successfully configured, UE moves to new cell.Such as Activationary time is really included in " switching command ", UE is switched to new cell when activationary time arrives.906 UE are in new cell " switching is completed " message is sent to ENB.

Figure 10 is that UE is in connection mode, and the method two of another ENB is moved to from ENB.The feature of the method It is that UE is directly switch to new cell, the Qos information needed for UE notice purpose ENB UE, without the mistake for preparing Radio Resource in advance Journey.

1001 steps, control command and measurement result that measurement result or UE according to UE are received from ENB, UE is switched to New cell.UE sends " handover request " to purpose ENB in new cell.Comprising UE marks, cell mark in handover request message Know the Qos information that business is connected with UE.After purpose ENB receives handover request message, allocation radio resource, if Radio Resource Into the distribution of work, " UP sets up request information for user plane mark such as TEID, the ENB transmission of 1002ENB distribution Iu+ interface downlinks To EGGSN.Downlink user plane mark such as TEID, ENB IP address, UE marks are included in message.EGGSN receives this message Afterwards, UE contexts are updated, user plane mark such as TEID is preserved, ENB IP address distributes up user plane mark example Such as TEID.1003 EGGSN send " UP sets up response " message and give purpose ENB.EGGSN stops sending number to UE original ENB According to starting to send data to new ENB.After purpose ENB receives UP foundation responses, up user plane mark is preserved for example TEID。

Purpose ENB is known that source ENB by two methods.Method one：UE informs purpose by handover request message ENB, this method of correspondence is also identified in " handover request " message comprising source ENB IP address or source ENB.Method two：EGGSN Purpose ENB is notified, this method of correspondence is identified in " UP sets up response " message comprising source ENB IP address or source ENB.

The ENB distribution Iur interfaces of 1004 mesh are used for the user plane mark such as TEID of data forwarding.Purpose ENB sends " number Source ENB is given according to forwarding request information, the user plane for being used for data forwarding comprising UE marks and Iur interfaces in message is identified Such as TEID.After source ENB receives data forwarding request lmessage, information, such as user plane mark are preserved, 1005 send " data forwarding Response " message gives purpose ENB.Comprising the RLC PDUs and corresponding sequence number that each is not confirmed in message, also The sequence number for next RLC PDU to be sent can be included.Also opened comprising forwarding data in data forwarding response message The GTP sequence numbers of beginning and the GTP sequence numbers for terminating.1006a sources ENB starts RLC SDUs to send by the user plane set up Give purpose ENB.The ENB of 1007 mesh is received after the UP of EGGSN sets up response message distributing resource, sends that " switching is true Recognize " to UE, it is radio-resource-configuration, UE marks, the new cell ID that UE is distributed that purpose ENB is included in message to message.

Correspondence EGGSN notifies that the data forwarding process (1004 arrive 1006a) of the method Iur interfaces of purpose ENB source ENB occurs After the UP of Iu+ interfaces sets up process.The method that corresponding UE informs purpose ENB source ENB by handover request message, Iu+ connects The UP of mouth sets up process and the data forwarding process of Iur interfaces does not have absolute sequencing.

It is also suitable without absolute priority to UE that the data forwarding process and purpose ENB of Iur interfaces send switch acknowledgment message Sequence.But it to UE is set up after response message in the UP for receiving 1103 that purpose ENB sends switch acknowledgment message.

1009 source of release ENB and EGGSN are for data forwarding between the resource that this UE is distributed and source ENB and purpose ENB User-plane resources.The process of resource can be initiated by EGGSN between source of release ENB and EGGSN, it is also possible to be sent out by source ENB Rise or purpose ENB is initiated.If source ENB does not receive data after data have been forwarded in a period of time, resource can be discharged, Including Radio Resource, UE contexts, user plane mark such as TEID.ENB initiates " resource release request " message and gives EGGSN requirements Release resource, EGGSN discharges resource after receiving message.EGGSN can also discharge resource after stopping sending data to source ENB, And " resource release request " message is sent to ENB, ENB discharges resource after receiving message.It is used to count between source ENB and purpose ENB Can be initiated by purpose ENB according to the user-plane resources release process of forwarding, purpose ENB sends releasing request and gives source ENB, source ENB receives the request message come from purpose ENB, and the Iur interfaces that preservation is discharged after the completion of data forwarding are used for data forwarding Resource.The process can also be initiated by source ENB.Source ENB discharges the Iur interfaces of preservation for data forwarding after having forwarded data Resource, and send releasing request give purpose ENB, purpose ENB receive from source ENB come request message after, release Iur interfaces be used for The resource of data forwarding.Source ENB can also indicate data forwarding knot in the packet of forwarding comprising a flag bit for end Beam.Purpose ENB has found that data forwarding discharges Iur interfaces and is used for the resource of data forwarding after terminating

In the above-mentioned description to Figure 10, user data is that RLC PDUs are by control plane in the retransmission method of Iur 1005 " data forwarding response " message are sent to purpose ENB.RLC SDUs are sent by user plane such as GTP-U.This is this The first method of data forwarding, i.e. RLCPDUs are forwarded by control plane in invention, and RLC SDUs are turned by user plane Hair.

The second method of data forwarding is that RLC SDUs and RLC PDUs are sent by control plane.Correspondence is this Method, signaling process combination Figure 10 that UE is moved between two ENB is illustrated.Here stress and gone up with first method State the difference of description.This method of correspondence, the 1006 SDU forwardings step in figure is that source ENB is controlled in 1006b steps by sending RLC SDUs are sent to purpose ENB by message " SDU data forwardings " message processed, and SDU container, SDU are included in message That included in container is the RLC SDUs without framing.The control plane message can be an independent message, also may be used Sent with by " data forwarding response " message, SDU container are included in " data forwarding response " message.Correspondence is this Method is not required to, it is necessary to special instruction is 1004 and 1005 process for being served only for request data forwarding and data forwarding in figure The user plane of Iur interfaces is set up, so purpose ENB need not distribute the Iur user planes of Interface User data forwarding Mark such as TEID.Identified not comprising this user plane in request message, ENB need not preserve the user plane of correspondence ENB distribution Mark.

The third method of data forwarding is that RLC SDUs and RLC PDUs are sent by user plane, and correspondence is this Method, signaling process combination Figure 10 that UE is moved between two ENB is illustrated.Here the area with first method is stressed Not.The user plane that RLC PDUs and RLC SDUs are set up by 1004 and 1005 steps, SDUs is forwarded in 1006c steps Purpose ENB is given with PDUs.In the packet header of data by set an indicator (indicating bit) come indicate PDU or SDU.RLC contextual informations by 1005 to each corresponding SN of RLC PDU and for the SN of next PDU as that " can count According to transmitted response " it is sent to purpose ENB.RLC contextual informations such as each corresponding SN of RLC PDU not being confirmed Purpose ENB can be sent to by source ENB by user plane together in itself with data.This method of correspondence is defined in the packet The field of SN, in the packet order include the corresponding RLC PDU of SN mono-, the corresponding RLC PDU of SN mono-.Should Field is optional.If for transmitting RLC SDU, the field does not exist.SN for next RLC PDU can also lead to Cross user plane to transmit, if so user-plane transmissions are RLC SDU, in the packet in the presence of a field of SN.

4th kind of method of data forwarding is only to forward not being confirmed the corresponding RLC of RLCPDU by user plane The SDUs and RLC SDUs without segmentation, this method of correspondence, signaling process combination Figure 10 that UE is moved between two ENB Explanation.Here the difference with first method is stressed.The user that RLC SDUs are set up by 1004 and 1005 steps Plane, purpose ENB is given in 1006a steps forwarding RLC SDUs.RLC contextual informations can as being used for the SN of next RLC PDU Purpose ENB is sent to by 1005 " data forwarding responses ".

It is also that (RLC PDUs are controlled with the first data forwarding method in following descriptions to node device action specification Plane, RLC SDUs user planes) come what is described.Other data forwarding methods of correspondence place different from the first will refer in particular to Go out.

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

1101 ENB receive message.If 1102 receive " handover request " message come from UE, 1103 according to request message In Qos, ENB carries out Access Control, checks whether the UE can access to this UE.If 1104 unavailable ENB send failure Response message to UE, information element reason is included in failure, cause value can be set for inadequate resource.If the UE Can access.1105ENB creates UE contexts, preserves information, such as UE marks, cell ID, Qos etc..ENB distribution Iu+ connects Mouth descending user plane mark such as TEID." UP sets up request information to EGGSN for 1106 ENB transmissions.Comprising descending in message User plane mark such as TEID, ENB IP address, UE marks.ENB wait-for-responses.

The method that corresponding UE informs purpose ENB source ENB by handover request message, ENB can now send " data forwarding Request information is to source ENB (step 1107) and wait-for-response.Can also receive from EGGSN next " UP sets up response " message " data forwarding request " message is sent afterwards to source ENB (step 1110) and wait-for-response.Correspondence EGGSN notifies purpose ENB source ENB Method, purpose ENB can only be sent after " UP the set up response " message come from EGGSN is received " data forwarding request " message to Source ENB (step 1110) and wait-for-response.

1108 steps, if ENB receives " UP the sets up response " message come from EGGSN, 1108ENB preserves information, for example The user plane mark such as TEID of EGGSN distribution.1110 ENB can now send " data forwarding request " message and give source ENB (as described above) and wait-for-response.1111 ENB send " switching confirms " message to UE, comprising purpose ENB for UE is distributed in message Radio-resource-configuration, UE mark, new cell ID.If ENB sends out after receiving " UP the sets up response " message come from EGGSN " data forwarding request " message is sent to give source ENB.Then ENB sends " data forwarding request " message to ENB and sends " switching confirms " Message does not have absolute sequencing to UE.

1112 steps, purpose ENB receives " data forwarding response " message come from source ENB, and the ENB of 1113 mesh preserves RLC Contextual information and the RLC PDUs not being confirmed.ENB can preserve RLC PDUs in repeatedly transmission is cached.Correspondence RLC SDUs are to be sent by control plane and are also the method forwarded by " data forwarding response ", and ENB cachings are received The RLC SDUs for arriving.Before the RLC SDUs received from source ENB can be put into the data received from EGGSN by ENB.Correspondence RLC SDUs is the method sent by one independent message 1006b " SDU data forwardings " of control plane, and ENB receives this and disappears After breath, the RLC SDUs that caching is received.ENB the RLC SDUs received from source ENB can be put into the data that receive from EGGSN it Before.

The third and the 4th kind of data forwarding method are corresponded to, when ENB receives 1112 " data forwarding response " message, correspondence In " data forwarding response " message comprising RLC contextual informations as correspondence each RLC PDU not being confirmed SN or The method of the SN of the next RLC PDU of person, 1113ENB preserve RLC contextual informations as be used for next RLC PDU SN or Each is not confirmed the SN of RLC PDU.

1114 ENB receive data.If 1115 ENB are received from source ENB or EGGSN relative users plane such as GTP tunnel The user data for coming, the data that 1116 ENB cachings are received.ENB is put into the data received from source ENB the number received from EGGSN According to before.Correspondence RLC PDUs and RLCSDUs are the methods (method three) forwarded by user plane, and ENB is according to packet Indicator in head, caches RLC PDUs and RLC SDUs respectively.Correspondence RLC contextual informations such as each RLC PDU Corresponding SN (or for SN of next RLC PDU) is all the method sended over by user plane data bag, and ENB is protected Deposit RLC contextual informations.Correspondence RLC SDUs are the methods sent by control plane, and ENB is only from the relative users of EGGSN Data are received in plane such as GTP tunnel and is cached.

Treatment of the ENB to RLC PDUs and RLC SDUs is same as the prior art, and data are processed and be sent to UE Process be not emphasis of the invention, detailed technology explanation is ignored here.

Corresponding this embodiment, the motion flow of wherein source ENB is as shown in figure 12.1201 ENB receive message.If 1202 " data forwarding request " message come from another ENB is received, 1203 ENB preserve information, such as user plane mark (correspondence RLC SDUs is the method forwarded by control plane, does not have user plane to identify in message).According to the UE marks received in message Know, 1204 source ENB send " data forwarding response " message and give purpose ENB, included in message the RLC PDU that are not confirmed and Corresponding SN, can also be comprising for next RLC PDU sequence numbers to be sent.ENB (can be held with PDU container Device) the RLC PDUs for not being confirmed (NACK) are sent to purpose ENB by data forwarding response message.1205 ENB lead to The user plane set up is crossed to start RLC SDUs to be sent to purpose ENB.Correspondence RLC SDUs are sent by control plane Method, RLC SDUs are sent to purpose by ENB by one independent message 1006b " SDU data forwardings " of control plane ENB.Source ENB can also also send out comprising SDU container, SDU container in " data forwarding response " comprising source ENB Give the RLCSDUs of purpose ENB.

The third method of corresponding data forwarding, source ENB forwards RLC in 1205 steps by the user plane set up PDUs and RLC SDUs give purpose ENB, and PDU or SDU is indicated by setting an indicator.RLC contextual informations The corresponding SN of RLC PDU that are not confirmed such as each and can be in 1204 steps for the SN of next RLC PDU " data forwarding response " message gives purpose ENB.It is not confirmed comprising each so in " data forwarding response " message The corresponding SN of RLC PDU, can also include the SN for next RLC PDU.Correspondence RLC contextual informations for example each The SN of RLC PDU corresponding SN or next PDU is also the method sended over by user plane data bag, in message not Comprising corresponding information.

Corresponding data forwarding the 4th kind of method, source ENB 1205 steps by set up user plane forward without Purpose ENB is given to the corresponding RLC SDUs of confirmation RLC PDUs and without the RLC SDUs being segmented.RLC contextual informations are such as used for The SN of next RLC PDU gives purpose ENB in " data forwarding response " message of 1204 steps.So " data forwarding response " disappear Comprising the SN for next RLC PDU in breath, not comprising PDU container.

1206, this step is the resource release process that corresponding source ENB is initiated.Source ENB a period of times after data have been forwarded If interior do not receive data, resource, including Radio Resource, UE contexts, user plane mark such as TEID can be discharged.ENB Initiate " resource release request " message and give EGGSN requirement release resources,

Correspondence EGGSN initiate resource discharge process method, if 1207 ENB receive from EGGSN come " resource release please Ask " message, ENB release resources, including Radio Resource, UE contexts, user plane mark such as TEID.If ENB is received 1207 To the resource release request come from purpose ENB, ENB release resources.

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

1301 EGGSN receive message.If 1302 receive from ENB come " UP sets up request information, and 1303 EGGSN are more The contextual information of new corresponding UE, preserves the user plane mark such as the IP address of TEID and ENB of descending new ENB distribution. 1304 EGGSN distribute the descending TEID for new ENB.1305 EGGSN send " UP sets up response " message to new ENB. 1306EGGSN stops sending data to ENB old where this UE, starts to send the data of UE to this new ENB.

The method that correspondence EGGSN initiates the resource that source of release ENB and EGGSN are this UE distribution, 1307 EGGSN release moneys Source, and " resource release request " message is sent to old ENB, identified comprising UE in message.

The method that corresponding source ENB initiates the resource that source of release ENB and EGGSN are this UE distribution, if 1308 EGGSN are received Corresponding resource, such as user plane mark are discharged according to request message from the resource release request that ENB comes, 1309.

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

1401 steps, UE is measured according to the measurement of ENB configuration.1402 receive according to measurement result, or UE from ENB Order (order that such as current area is nearly overloaded) and measurement result, UE is switched to new cell.1403 UE are new small " handover request " message is sent in area and gives purpose ENB.

1404 steps, UE receives message.If 1405 UE receive " switching confirm " message come from ENB, 1406 UE according to The Radio Resource situation configuration resource of the new cell in switching confirmation.After the completion of resource distribution, 1407 UE send out in new cell Send and receive data.

Figure 15 is that UE is in connection mode, and the method three of another ENB is moved to from ENB.The feature of the method That UE is directly switch to new cell, source ENB notify purpose ENB to know UE needed for Qos information, without preparing wireless money in advance The process in source.

1501 steps, control command and measurement result that measurement result or UE according to UE are received from ENB, UE is switched to New cell.UE sends " handover request " to purpose ENB in new cell.Comprising UE marks, cell mark in handover request message Know and source ENB IP address or source ENB marks.After the ENB of 1502 mesh receives handover request message, purpose ENB distribution Iur connects User plane mark such as TEID of the mouth for data forwarding.Purpose ENB sends " data forwarding request " message and gives source ENB, message In be used for the user plane mark of data forwarding such as TEID comprising UE marks and Iur interfaces.Source ENB receives data forwarding request After message, user plane mark such as TEID in request message is preserved, 1503 transmission " data forwarding response " message give purpose ENB. Comprising the RLC PDU and corresponding SN not being confirmed in message, can also be comprising for next RLC to be sent The sequence number and UE of PDU connect the Qos information of business.ENB can be with PDU container (container) not being confirmed (NACK) RLC PDUs are sent to purpose ENB by data forwarding response message.Also included in data forwarding response message and turned GTP sequence numbers and the GTP sequence numbers of end that hair data start.1504a sources ENB is started RLC by the user plane set up SDUs is sent to purpose ENB.Purpose ENB checks the resource for needing, if Radio Resource can be into the distribution of work, 1505ENB distribution The user plane mark of Iu+ interface downlinks such as TEID, " UP sets up request information to EGGSN for ENB transmissions.Comprising descending in message User plane mark such as TEID, ENB IP address, UE marks.After EGGSN receives this message, UE contexts are updated, preserve user Plane mark such as TEID, ENB IP address distributes up user plane mark such as TEID.1506 EGGSN send " UP foundation Response " message gives purpose ENB.EGGSN stops sending data to UE original ENB, starts to send data to new ENB.Purpose After ENB receives UP foundation responses, up user plane mark such as TEID is preserved.Purpose ENB cachings are received from source ENB and EGGSN The user data for arriving.Before the RLC SDUs received from source ENB can be put into the data received from EGGSN by purpose ENB. The SDU repeating process of 1504a and 1505,1506 UP set up process can be while carry out.

The ENB of 1507 mesh is received after the UP of EGGSN sets up response message distributing resource, sends that " switching is true Recognize " to UE, it is radio-resource-configuration, UE marks, the new cell ID that UE is distributed that purpose ENB is included in message to message.

1508 source of release ENB and EGGSN are for data forwarding between the resource that this UE is distributed and source ENB and purpose ENB User-plane resources.The process of resource can have EGGSN to initiate between source of release ENB and EGGSN, it is also possible to be sent out by source ENB Rise.If source ENB does not receive data after data have been forwarded in a period of time, resource, including Radio Resource, UE can be discharged Context, user plane mark such as TEID.ENB initiates " resource release request " message and gives EGGSN requirement release resources, EGGSN Resource is discharged after receiving message.EGGSN can also discharge resource, and send that " resource is released after stopping sending data to source ENB Request information is put to ENB, ENB discharges resource after receiving message.The user for being used for data forwarding between source ENB and purpose ENB puts down Face resource release process can be initiated by purpose ENB, and purpose ENB sends releasing request and receives from purpose ENB to source ENB, source ENB The request message come, the Iur interfaces of preservation are discharged after the completion of data forwarding is used for the resource of data forwarding.The process can also Initiated by source ENB.Source ENB has forwarded the Iur interfaces that preservation is discharged after data to be used for the resource of data forwarding, and send release please Ask and give purpose ENB, after purpose ENB receives the request message come from source ENB, release Iur interfaces are used for the resource of data forwarding.Source ENB can also indicate data forwarding to terminate in the packet of forwarding comprising a flag bit for end.Purpose ENB has found data Forwarding discharges Iur interfaces after terminating is used for the resource of data forwarding.

In the above-mentioned description to Figure 15, user data is that RLC PDUs are by control plane in the retransmission method of Iur " data forwarding response " message is sent to purpose ENB.RLC SDUs are sent by user plane such as GTP-U.This is the present invention The first method of middle data forwarding, i.e. RLC PDUs are forwarded by control plane, and RLC SDUs are forwarded by user plane.

The second method of data forwarding is that RLC SDUs and RLC PDUs are sent by control plane.Correspondence is this Method, signaling process combination Figure 15 that UE is moved between two ENB is illustrated.Here stress and gone up with first method State the difference of description.This method of correspondence, the 1504 SDU forwardings step in figure is that source ENB is controlled in 1504b steps by sending RLC SDUs are sent to purpose ENB by message " SDU data forwardings " message processed, and SDU container, SDU are included in message That included in container is the RLC SDUs without framing.The control plane message can be an independent message, also may be used Sent with by " data forwarding response " message, SDU container are included in " data forwarding response " message.Correspondence is this Method is not required to, it is necessary to special instruction is 1502 and 1503 process for being served only for request data forwarding and data forwarding in figure The user plane of Iur interfaces is set up, so purpose ENB need not distribute the Iur user planes of Interface User data forwarding Mark such as TEID.Identified not comprising this user plane in request message, ENB need not preserve the user plane of correspondence ENB distribution Mark.

The third method of data forwarding is that RLC SDUs and RLC PDUs are sent by user plane, and correspondence is this Method, signaling process combination Figure 15 that UE is moved between two ENB is illustrated.Here the area with first method is stressed Not.The user plane that RLC PDUs and RLC SDUs are set up by 1502 and 1503 steps, SDUs is forwarded in 1504c steps Purpose ENB is given with PDUs.In the packet header of data by set an indicator (indicating bit) come indicate PDU or SDU.RLC contextual informations such as each corresponding SN of RLC PDU not being confirmed and can to the SN of next RLC PDU Purpose ENB is sent to by 1503 " data forwarding responses ".RLC contextual informations such as each RLC not being confirmed The corresponding SN of PDU can also be sent to purpose ENB by user plane by source ENB together in itself with data.This method of correspondence The field of SN is defined in the packet, order includes the corresponding RLC PDU of SN mono- in the packet, a SN mono- is right The RLC PDU for answering.The field is optional.If for transmitting SDU, the field does not exist.For next RLC PDU's SN can also be transmitted by user plane, if so user-plane transmissions are RLC SDU, in the packet in the presence of one The field of SN.

4th kind of method of data forwarding is only to forward not being confirmed the corresponding RLC of RLCPDU by user plane The SDUs and RLC SDUs without segmentation, this method of correspondence, signaling process combination Figure 15 that UE is moved between two ENB Explanation.Here the difference with first method is stressed.The user that RLC SDUs are set up by 1502 and 1503 steps Plane, purpose ENB is given in 1504a steps forwarding SDUs.RLC contextual informations can pass through such as the SN to next RLC PDU 1503 " data forwarding responses " are sent to purpose ENB.

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

1601 ENB receive message.If 1602 receive " handover request " message come from UE, it is upper and lower that 1603ENB creates UE Text, preserves information, such as UE marks, cell ID, source ENB etc..The user plane that distribution Iur interfaces are used for data forwarding is identified Such as TEID (correspondence RLC SDUs are the methods sent by control plane, and ENB need not distribute this user plane mark). 1604 ENB send " data forwarding request " message and give source ENB, and wait-for-response.

If 1605 purpose ENB receive " data forwarding response " message come from source ENB, the ENB of 1606 mesh is preserved on RLC Context information and RLC PDUs, UE for not being confirmed connect the Qos of business.ENB can preserve RLC PDUs to repetition Send in caching.Correspondence RLC SDUs are sent by control plane and are also to be forwarded by " data forwarding response " Method, the RLC SDUs that ENB cachings are received.ENB can be put into the RLC SDUs received from source ENB the number received from EGGSN According to before.Correspondence RLC SDUs are the sides sent by one independent message 1504b " SDU data forwardings " of control plane Method, after ENB receives this message, the RLC SDUs that caching is received.ENB can the RLC SDUs received from source ENB be put into from Before the data that EGGSN is received.The third and the 4th kind of data forwarding method are corresponded to, ENB receives 1605 " data forwarding responses " During message, if the SN comprising RLC contextual informations such as each RLC PDU not being confirmed or under being used in message One SN of RLC PDU, 1606 ENB preserve the RLC contextual informations in message

1607 according to needed for UE business Qos, ENB carries out Access Control, checks whether the UE can access to this UE. If 1608 cannot ENB send failure response message to UE, in failure include information element reason, can set Cause value is inadequate resource.If the UE can be accessed.1609 ENB retain resource, and the user of ENB distribution Iu+ interface downlinks puts down Face mark such as TEID." UP sets up request information to EGGSN for 1609 ENB transmissions.In message comprising downlink user plane mark such as TEID, purpose ENB IP address, UE marks.ENB wait-for-responses.

1610 steps, if ENB receives " UP the sets up response " message come from EGGSN, 1108ENB preserves information, for example The user plane mark such as TEID of EGGSN distribution.1612 ENB send " switching confirms " message and, to UE, purpose are included in message ENB is the radio-resource-configuration of UE distribution, UE marks, new cell ID.

1613 ENB receive data.If 1614 ENB are received from source ENB or EGGSN relative users plane such as GTP tunnel The user data for coming, the data that 1615 ENB cachings are received.ENB is put into the data received from source ENB the number received from EGGSN According to before.Correspondence RLC SDUs and RLCPDUs are the method sent by control plane, ENB mutually applying from EGGSN Data are received in family plane such as GTP tunnel and is cached.Correspondence RLC PDUs and RLC SDUs is forwarded by user plane Method (method three), indicators of the ENB in data packet head caches RLC PDUs and RLC SDUs respectively.Correspondence RLC Contextual information for example each be not confirmed the corresponding SN of RLC PDU (or for SN of next RLC PDU) It is the method sended over by user plane data bag, ENB preserves RLC contextual informations.

Corresponding this embodiment, the wherein motion flow of source ENB is identical with the motion flow of source ENB in method two, such as Figure 12 It is shown.Difference is 1204 to be sent in " data forwarding response " message of purpose ENB by source ENB, also comprising UE access service Qos parameters.

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

Corresponding this embodiment, the wherein motion flow of UE is identical with the motion flow of UE in method two, as shown in figure 14.Area Be not 1403 to be sent in " handover request " message of purpose ENB by UE, comprising cell ID, UE marks, source ENB IP ground Location or the mark of source ENB, the Qos parameters not comprising UE access service.

It is above-mentioned it is mobile between two ENB to UE during (including the several different signaling processes introduced) different pieces of information All it is to be introduced by taking the forwarding of downlink data as an example in the description of pass-through mode.For up, it may not be necessary to data forwarding, If certain RLCPDU for corresponding to some RLC SDU does not receive confirmation, UE repeats the data for sending whole RLC SDU.

There can also be up data forwarding, it is up to only need to the acknowledged RLC PDUs of forwarding.With above-mentioned descending RLC The pass-through mode of PDUs is identical, and the forwarding of up RLC PDUs can be forwarded by control plane, it is also possible to by user plane Forwarding.If RLC PDUs are forwarded by user plane, corresponding each SN can be forwarded by control plane can also be passed through User plane is forwarded.The action of the signaling process and source ENB and purpose ENB of corresponding each method and above-mentioned downlink data Forwarding is identical, and detailed technology explanation is ignored here.If up the data for forwarding and the data for down forwarding in same use Sent, it is necessary to an instruction defined in data packet head is up or descending indicating bit in the plane of family.For example in packet header have One indicating bit of 1 bit.

Claims

1. UE mobility methods are supported in a kind of LTE system, wherein, UE is moved between two ENB, including step：

Source ENB determines UE to be switched to the cell of purpose ENB according to " measurement report " received from UE, and sends " resource request " Message gives purpose ENB；

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

Source ENB sends " switching command " to UE；

RLC SDU are sent to purpose ENB by source ENB, and RLC PDU that each is not confirmed and corresponding system Row number SN is sent to purpose ENB；

Purpose ENB receives " switching is completed " message come from UE；

Purpose ENB sends " UP registrations " message and is registered to EGGSN.

2. method according to claim 1, it is characterised in that also include：Source ENB sends RLC context transfer message to mesh ENB, the RLC context transfers message package containing for next descending two-layer protocol PDU sequence number SN.

3. method according to claim 1, it is characterised in that information element cell is included in " resource request " message Mark, UE marks, QoS.

4. method according to claim 1 and 2, it is characterised in that information element mesh is included in the resource response message ENB distribution for data forwarding user plane mark.

5. method according to claim 4, it is characterised in that information element purpose is included in the resource response message The user plane mark for data forwarding of ENB distribution is Tunnel Endpoint mark.

6. method according to claim 1 and 2, it is characterised in that information element RRC is included in the resource response message Container, wherein, comprising the radio-resource-configuration that purpose ENB is UE distribution in RRC containers.

7. method according to claim 1 and 2, it is characterised in that information element is included in " resource request " message EGGSN is the user plane mark of UE distribution.

8. method according to claim 7, it is characterised in that the information element included in " resource request " message EGGSN is that the user plane mark of UE distribution is Tunnel Endpoint mark.

9. UE mobility methods are supported in a kind of LTE system, wherein, UE is moved between two ENB, including step：

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

Purpose ENB sends " UP registrations " message and is registered to EGGSN；

Source ENB sends " switching command " to UE；

Purpose ENB receives " switching is completed " message come from UE.

10. method according to claim 9, it is characterised in that also include：Source ENB send RLC context transfers message to Purpose ENB, the RLC context transfers message package is containing the sequence number SN for next descending two-layer protocol PDU.