CN106941733A

CN106941733A - Method for realizing reconfiguration in dual connection, main service base station and auxiliary service base station

Info

Publication number: CN106941733A
Application number: CN201610006280.6A
Authority: CN
Inventors: 刘星; 施小娟; 黄河
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2016-01-04
Filing date: 2016-01-04
Publication date: 2017-07-11
Anticipated expiration: 2036-01-04
Also published as: CN106941733B; WO2017118225A1

Abstract

The invention discloses a method for realizing reconfiguration in double connection, a main service base station and an auxiliary service base station.A user plane interface for providing uplink data service and downlink data service for UE is established between a source SeNB and a target SeNB in the process of transferring the user plane bearing of the UE from the source SeNB to the target SeNB under the same MeNB; in the reconfiguration process, the target SeNB forwards the uplink RLC data PDU to the source SeNB, and the source SeNB shunts the downlink PDCP data PDU to the target SeNB and keeps data transmission with the UE until the reconfiguration is successful. In the process of establishing connection with the target SeNB, the UE establishes a user plane interface between the source SeNB and the target SeNB for providing uplink/downlink data service for the UE, so that the problem that the UE cannot transmit data with a network side on a micro base station or a low-power node layer when performing uplink and downlink synchronization with the target SeNB and establishing connection is solved, the rapid reduction of the user plane data throughput is avoided, and the user experience of the UE during user plane reconfiguration is ensured.

Description

The method reconfigured, main serving BS and auxiliary serving BS are realized in dual link

Technical field

The present invention relates to mobile communication technology, the method reconfigured, main clothes are realized in espespecially a kind of dual link Business base station and auxiliary serving BS.

Background technology

Fig. 1 is the network architecture schematic diagram of dual link (DC, Dual connectivity) in correlation technique, As shown in figure 1, for for each user equipment (UE, User equipment), on a control plane, Main serving BS (MeNB, Master eNB) such as macro base station node is connected to movement by S1-MME Management entity (MME, Mobility Management Entity), MeNB and auxiliary serving BS (SeNB, Secondary eNB) as connected between micro-base station or low power nodes by X2-C.In user plane, For main plot group carrying (MCG bearer, Master cell group bearer), MeNB passes through S1-U Gateway (S-GW, Serving Gateway) is connected to, SeNB does not identify oneself with the data of user plane Transmission.For shunting carrying (split bearer), MeNB is connected to S-GW, MeNB by S1-U SeNB is connected to by X2-U.(SCG bearer, Secondary cell group are carried for secondary cell group Bearer), SeNB is connected to S-GW by S1-U, and MeNB does not identify oneself with the data transfer of user plane.

Fig. 2 is the user face data of long-term evolution (LTE, Long-term evolution) in correlation technique Protocol stack, as shown in Fig. 2 from core net through user level GPRS Tunnel Protocol (GTP-U, GPRS Tunnelling Protocol for the User Plane) downlink data that receives, pass through packet count after unpacking According to convergence protocol (PDCP, Packet Data Convergence Protocol) sublayer, wireless spread-spectrum technology (RLC, Radio Link Control) protocol sublayers, medium education (MAC, Medium Access Control) it is sent to UE after protocol sublayers and physical layer (PHY) processing；The transmission of upstream data is with Row data contrast.Third generation partner program (3GPP, 3rd Generation Partnership Project) when discussing 12 dual links of Release, the shunting mode of two kinds of user planes was mentioned：One kind is The carrying user plane of 1A, i.e. UE on MeNB and SeNB is connected directly between on S-GW, such as Fig. 3 It is shown；One kind is 3C, i.e. MeNB does shunting anchor point, and data occur to divide at PDCP layers with rlc layer Stream, is sent respectively to MeNB and SeNB is transmitted, as shown in Figure 4.

The purpose of dual link, is transfer between SeNB of the UE user plane bearer under same MeNB When, the signaling impact to core net can be reduced, while ensureing UE data throughout and Consumer's Experience. However, for SCG bearer, PDCP layers of reconstruction during due to reconfiguring, user plane still can There is larger interruption.Even if consider need not the PDCP layer split bearer that rebuild, UE remains unchanged execution Be the first company of having no progeny operation, i.e. UE resettled with target SeNB's after source SeNB is disconnected Connection.Under normal circumstances, SeNB role is undertaken by micro-base station or low power nodes, MeNB role Undertaken by macro base station node.Because micro-base station or low power nodes are nearer apart from UE, coverage is smaller, SeNB can carry user plane streamed datas more more than MeNB, therefore, even sum of short duration UE SeNB disconnects the drastically decline for still resulting in user throughput.

The content of the invention

The present invention provides in a kind of dual link and realizes the method reconfigured, main serving BS and auxiliary serving BS, The drastically decline of user face data handling capacity can be avoided.

In order to reach the object of the invention, the invention provides realizing the method that reconfigures in a kind of dual link, In the matching somebody with somebody from the source SeNB target SeNB being transferred under same MeNB by UE user plane bearer again During putting, including：

Set up between source SeNB and target SeNB and provide upstream data service and downlink data service for UE Interface in the user plane；

In reconfiguration course, uplink radio link is controlled RLC data protocol data lists by target SeNB First PDU is transmitted to source SeNB, and source SeNB is by downlink grouped data convergence protocol PDCP data PDU It is diverted to target SeNB.

Alternatively, this method also includes：The source SeNB keeps the data transfer with the UE until weight Configuration successful.

Alternatively, it is described set up interface in the user plane before also include：

The MeNB indicates that the target SeNB will be transferred to mesh to be one or more on the SeNB of source Secondary cell group carrying SCG bearer on mark SeNB set up corresponding shunting carrying split bearer agreements Entity.

Alternatively, it is described set up between source SeNB and target SeNB for UE provide upstream data service and The interface in the user plane of downlink data service includes：

The MeNB will be sent to source SeNB from the target SeNB transport Layer address distributed, So that UE is established as between the source SeNB and the target SeNB provides downlink data shunting service Interface in the user plane；

The MeNB is sent to target after receiving the transport Layer address of the distribution from the source SeNB SeNB, so that UE is established as between the source SeNB and the target SeNB provides upstream data Shunt the interface in the user plane of service.

Alternatively, the MeNB indicates that target SeNB will shift to be one or more on the SeNB of source SCG bearer on to target SeNB, which set up corresponding split bearer protocol entities, to be included：

The MeNB sends to the target SeNB and receives request message, is taken in request message is received With split bearer configuration informations or set up split bearer configured information；

Wherein, split bearer configuration informations or set up split bearer configured information be used for be the source The upper one or more SCG bearer that will be transferred on the target SeNB of SeNB are in the target The corresponding split bearer protocol entities are set up on SeNB.

Alternatively, the MeNB will be sent to source SeNB from the target SeNB transport Layer address distributed, So as to be established as the user plane that UE provides downlink data shunting service between source SeNB and target SeNB Interface includes：

After the target SeNB is completed to UE resource distribution, admission confirmation is replied to the MeNB Message, carries the promising split bearer for receiving the foundation descending PDCP in admission confirmation message Data PDU and the transport Layer address distributed；

The MeNB is received after admission confirmation message, and modification request message is sent to the source SeNB, The transport Layer address of the target SeNB distribution is carried in modification request message, the purpose is to set up Connect between the source SeNB and the target SeNB for the UE user planes for providing downlink data shunting service Mouthful.

Alternatively, the MeNB is sent to mesh after receiving the transport Layer address of the distribution from source SeNB SeNB is marked, so that UE is established as between source SeNB and target SeNB provides upstream data shunting clothes The interface in the user plane of business includes：

The source SeNB sends modification request confirmation message to the MeNB, disappears in modification request confirmation The biography that the promising split bearer for receiving the foundation up RLC data PDU is carried in breath and is distributed Defeated layer address；

The MeNB is after confirmation message is asked in the modification for receiving the source SeNB, to the target SeNB sends X2 notification messages, and the transmission of the source SeNB distribution is carried in X2 notification messages Layer address, the purpose is to setting up between the source SeNB and the target SeNB provide line number for UE According to the interface in the user plane of shunting service.

Alternatively, this method also includes：

The MeNB is after confirmation message is asked in the modification for receiving the source SeNB, according to what is received Entrained information constitutes the radio resource control RRC signaling towards UE and sent in admission confirmation message To UE；UE is receiving the instruction from the MeNB by one or more SCG bearer from described Source SeNB is transferred to after the RRC signaling of the target SeNB, according to being taken in the RRC signaling of acquisition The information of band, synchronizes with the target SeNB, initiates Stochastic accessing to the target SeNB, SCG bearer are set up according to new configuration, and set up corresponding split bearer protocol entities.

Alternatively, up RLC data PDU is transmitted to source SeNB and included by the target SeNB：It is logical The transport Layer address that the up RLC data PDU of the split bearer to receive the foundation is distributed is crossed, Up RLC data PDU is transmitted to the source SeNB；

Descending PDCP data PDU is diverted to target SeNB by the source SeNB to be included：By to connect The transport Layer address received the split bearer of the foundation descending PDCP PDU and distributed, will part or All descending PDCP data PDU is diverted to the target SeNB and is transmitted.

Alternatively, for the split bearer of the foundation,

On the uplink, data are shunted between the PDCP layers and rlc layer of the source SeNB, point The source SeNB is not sent to and the target SeNB is transmitted, and is only set up on the target SeNB Protocol entity under PDCP layers；The UE is received from eating dishes without rice or wine after two-way downlink data, at PDCP layers Merge；

On uplink, data are shunted between the rlc layer and MAC of the UE, are passed through respectively Eat dishes without rice or wine to be sent on the source SeNB and the target SeNB, the target SeNB and only set up RLC Protocol entity under layer；The target SeNB is received after upstream data, is sent to the source SeNB, Merged in the rlc layer of the source SeNB.

Alternatively, it is described set up between source SeNB and target SeNB for UE provide upstream data service and After the interface in the user plane of downlink data service, this method also includes：

After UE accesses the target SeNB and completes config update, if the target SeNB is The descending PDCP data PDU, the target SeNB of shunting are received from the source SeNB by X2-U Start to be sent to after the underlying protocol entity that descending PDCP data PDU passes through split bearer is handled UE。

UE accesses the target SeNB and completed after config update, by corresponding with the target SeNB Split bearer and/or SCG bearer protocol entities, to the target SeNB send upstream data bag.

Alternatively, when the source SeNB receives the end of identification from S-GW, this method also includes：

It is after all downlink data packets distribute No. SN of PDCP sublayers, to the mesh in the source SeNB Mark SeNB and send SN state transfer message, the target SeNB is opened according to SN state transfer message Begin to receive No. SN of downlink data packet distribution PDCP sublayers from S-GW；Completed in the source SeNB After the transmission and/or forwarding of all downlink datas, carry out the source SeNB to MeNB requests and discharge； Correspondingly,

The target SeNB is successfully transmitted all data that down forward, or from SCG bearer Protocol entity receives the upstream data bag from UE and has completed the sequence of all forwarding uplink data bags, The split bearer protocol entities are deleted to MeNB requests；

The MeNB receives the release source SeNB from the source SeNB and the target SeNB And delete after the message of the split bearer protocol entities, the MeNB sends SeNB to source SeNB Confirmation message is discharged, the MeNB sends SeNB modification confirmation messages, institute to the target SeNB State MeNB and send RRC connections reconfiguration message requirement UE deletion correspondence split bearer to UE.

Present invention also offers a kind of main serving BS, including first processing units, for setting up source SeNB The interface in the user plane of upstream data service and downlink data service is provided between target SeNB for UE.

Alternatively, the first processing units set up module including first, and second sets up module；Wherein,

First sets up module, for will be sent to source from the target SeNB transport Layer address distributed SeNB, so that UE is established as between the source SeNB and the target SeNB provides downlink data Shunt the interface in the user plane of service；

Second sets up module, is sent after the transport Layer address for receiving the distribution from the source SeNB To the target SeNB, and so as to it is established as UE between the source SeNB and the target SeNB The interface in the user plane of upstream data shunting service is provided；Constitute the RRC signaling towards UE and be sent to UE。

Alternatively, described first set up module and be additionally operable to：It is the source SeNB to indicate the target SeNB Upper one or more SCG bearer that will be transferred on the target SeNB set up corresponding split Bearer protocol entities.

Alternatively, described first set up module specifically for：

Sent to the target SeNB and carry split bearer configuration informations or set up split bearer's The receiving request message of configured information；Wherein, split bearer configuration informations or split bearer finger is set up Showing information is used to one or more to be transferred on the target SeNB on the source SeNB SCG bearer set up corresponding split bearer protocol entities on the target SeNB；

Receive the promising descending PDCP for receiving the split bearer set up of carrying from the target SeNB Data PDU and the admission confirmation message of transport Layer address distributed, send to the source SeNB and carry The modification request message of the transport Layer address of the target SeNB distribution.

Alternatively, described second set up module specifically for：

Receive the promising up RLC numbers for receiving the split bearer set up of carrying from the source SeNB The modification request confirmation message for the transport Layer address distributed according to PDU；Send and take to the target SeNB Divide with the up RLC data PDU to receive the split bearer set up that the source SeNB is distributed The X2 notification messages for the transport Layer address matched somebody with somebody；According to letter entrained in the admission confirmation message received Breath constitutes the RRC signaling towards UE and is sent to UE.

Alternatively, described second set up module and be additionally operable to：

Receive the release source SeNB from the source SeNB and the target SeNB and delete described The message of split bearer protocol entities, sends SeNB release confirmation messages, to institute to the source SeNB State target SeNB and send SeNB modification confirmation messages, reconfigure and disappear to UE transmission RRC connections Breath requires that UE deletes correspondence split bearer.

Invention further provides a kind of auxiliary serving BS, including：Second processing unit, and/or the 3rd processing Unit；Wherein,

Second processing unit, for according to the instruction from MeNB, being one or more on the SeNB of source The SCG bearer that will be transferred on target SeNB set up corresponding split bearer protocol entities；For Receive the split bearer set up descending PDCP data PDU and distribute transport Layer address；Reception comes from The transport Layer address of MeNB source SeNB distribution, is established as between source SeNB and target SeNB UE provides the interface in the user plane of upstream data shunting service；

3rd processing unit, is divided with the up RLC data PDU of the split bearer to receive foundation With transport Layer address；Receive the transport Layer address of the distribution of the target SeNB from MeNB；In source SeNB The interface in the user plane that UE provides downlink data shunting service is established as between target SeNB.

Alternatively, the second processing unit specifically for：

Receive carrying split bearer configuration informations or set up split bearer from the MeNB Configured information receiving request message, be that one or more on the source SeNB will be transferred to target SCG bearer on SeNB set up corresponding split bearer protocol entities on the target SeNB；

The descending PDCP data for carrying the promising split bearer for receiving and setting up are sent to the MeNB PDU and the admission confirmation message of transport Layer address distributed；

Receive the split to receive foundation for carrying the source SeNB distribution from the MeNB Bearer up RLC data PDU and the transport Layer address distributed modification request confirmation message；Set up Connect between the source SeNB and the target SeNB for the UE user planes for providing upstream data shunting service Mouthful；

In reconfiguration course, up RLC data PDU is transmitted to the source SeNB.

Alternatively, the 3rd processing unit specifically for：

Receive the modification of the transport Layer address for carrying the target SeNB distribution from the MeNB Request message；Set up between the source SeNB and the target SeNB and provide downlink data shunting for UE The interface in the user plane of service；

The up RLC data PDU for carrying the promising split bearer for receiving and setting up is sent to the MeNB And the modification request confirmation message for the transport Layer address distributed；

In reconfiguration course, descending PDCP data PDU is diverted to the target SeNB.

Alternatively, the 3rd processing unit is additionally operable to：The data transfer with the UE is kept until weight Configuration successful.

Alternatively, the 3rd processing unit is additionally operable to：It is institute when receiving the end of identification from S-GW There is downlink data packet to distribute after No. SN of PDCP sublayers, sending SN states to the target SeNB passes Defeated message, after the transmission and/or forwarding that complete all downlink datas, is carried out described to MeNB requests Source SeNB discharges；Correspondingly,

The second processing unit is additionally operable to：According to SN state transfer message, start to receive from S-GW No. SN of PDCP sublayers is distributed to downlink data packet；All number is down forwarded being successfully transmitted According to, or, receive the upstream data bag from UE and complete from SCG bearer protocol entities Into the sequence of all forwarding uplink data bags, the split bearer agreements are deleted to MeNB requests Entity.

Compared with prior art, technical scheme includes：By UE user plane bearer from source SeNB In the reconfiguration course for being transferred to the target SeNB under same MeNB, source SeNB and target are set up The interface in the user plane of upstream data service and downlink data service is provided between SeNB for UE；Reconfiguring During, up RLC data PDU is transmitted to source SeNB by target SeNB, and source SeNB will be descending PDCP data PDU is diverted to target SeNB.UE during foundation and target SeNB connection, Set up between source SeNB and target SeNB and the interface in the user plane of uplink/downlink data, services be provided for UE, So as to solve UE when carrying out synchronization with target SeNB and setting up connection, it is impossible to and network side Micro-base station or low power nodes aspect have data transfer the problem of, it is to avoid avoid user face data from handling up The drastically decline of amount, it is ensured that Consumer's Experiences of the UE when user plane is reconfigured.

Meanwhile, target SeNB need not be to having transmitted to source SeNB lower line number before reconfiguring According to again through PDCP layers pack after issue UE, that is to say, that have transmitted to the descending of source SeNB Data need not be transmitted to target SeNB by data forwarding, it is not required that by target SeNB PDCP Layer is sent to UE after repacking, so as to reduce the waste of reprocessing.

Other features and advantages of the present invention will be illustrated in the following description, also, partly from froming the perspective of Become apparent, or understood by implementing the present invention in bright book.The purpose of the present invention is excellent with other Point can be realized and obtained by specifically noted structure in specification, claims and accompanying drawing.

Brief description of the drawings

Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes one of the application Point, schematic description and description of the invention is used to explain the present invention, does not constitute to the present invention's It is improper to limit.In the accompanying drawings：

The network architecture schematic diagram that Fig. 1 is DC in correlation technique；

The user face data protocol stack that Fig. 2 is LTE in correlation technique；

The schematic diagram that Fig. 3 is dual link user plane 1A in correlation technique；

The schematic diagram that Fig. 4 is dual link user plane 3C in correlation technique；

Fig. 5 is to realize the flow chart of the method reconfigured in dual link of the present invention；

Fig. 6 is to realize the schematic flow sheet of the embodiment reconfigured in dual link of the present invention；

Fig. 7 is the schematic diagram of the first embodiment of user plane protocol entity of the present invention and downlink data transmission；

Fig. 8 is the schematic diagram of the second embodiment of user plane protocol entity of the present invention and downlink data transmission；

Fig. 9 is the schematic diagram of the 3rd embodiment of user plane protocol entity of the present invention and transmitting uplink data；

Figure 10 is the schematic diagram of the fourth embodiment of user plane protocol entity of the present invention and transmitting uplink data

Figure 11 is the composition structural representation of main serving BS of the invention；

Figure 12 is the composition structural representation of auxiliary serving BS of the invention.

Embodiment

For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with accompanying drawing Embodiments of the invention are described in detail.It should be noted that in the case where not conflicting, this Shen Please in embodiment and the feature in embodiment can mutually be combined.

In the correlation technique of the 1A frameworks of dual link, UE user plane bearer is shifted from source SeNB Target SeNB under to same MeNB, although that MeNB is performed is first addition target SeNB, then delete Except source SeNB flow, but actual UE needs elder generation to be disconnected from source SeNB, resettles and target SeNB connection, therefore, can equally exist due to UE it is of short duration and SeNB disconnect and cause The problem of drastically decline of user throughput.

And in technical scheme provided in an embodiment of the present invention, mistakes of the UE in foundation and target SeNB connection Cheng Zhong, sets up between source SeNB and target SeNB and the user of uplink/downlink data, services is provided for UE Face interface, so as to solve UE when carrying out synchronization with target SeNB and setting up connection, it is impossible to With network side the problem of micro-base station or low power nodes aspect have data transfer, it is to avoid user face data The drastically decline of handling capacity, it is ensured that Consumer's Experiences of the UE when user plane is reconfigured.

Fig. 5 is to realize the flow chart of the method reconfigured in dual link of the present invention, by UE user plane Carrying is from source SeNB is transferred to the reconfiguration course of the target SeNB under same MeNB, such as Fig. 5 It is shown, including：

Step 500：Set up between source SeNB and target SeNB for UE provide upstream data service and under The interface in the user plane of row data, services.

Also include before this step：MeNB indicates that target SeNB is one or more on the SeNB of source incites somebody to action The SCG bearer being transferred on target SeNB set up corresponding split bearer protocol entities.Specifically Including：MeNB sends to target SeNB and receives request message, except reference in request message is received X2-AP message (SeNB addition request) in related protocol and carry key information, UE safety Ability information, SCG bearer configuration informations etc. are outer, also at least carry split bearer configuration informations or Set up split bearer configured information.Wherein, split bearer configuration informations or split bearer are set up Configured information be used for for one or more SCG that will be transferred on target SeNB on the SeNB of source Bearer sets up corresponding split bearer protocol entities on target SeNB.

The realization of this step includes：MeNB is by the transport Layer address such as GPRS distributed from target SeNB Tunnel protocol (GTP, GPRS Tunnelling Protocol) tunnel endpoint identifier (TEID, Tunnel Endpoint Identity) etc. be sent to source SeNB so that between source SeNB and target SeNB set up The interface in the user plane of downlink data shunting service is provided for UE.Specifically include：

Target SeNB determines whether enough resources to allow UE access according to the information received. If allowing access, after target SeNB completions are to UE resource distribution, reply and receive to MeNB Confirmation message, is removed with reference to X2-AP message (SeNB addition in related protocol in admission confirmation message Request acknowledge) and carry target SeNB and agree to outside the SCG bearer configuration informations of receiving, Also at least carry the promising split bearer for receiving and setting up descending PDCP data protocol data units (PDU, Protocol Data Unit) and distribute transport Layer address such as GTP TEID；

MeNB is received after admission confirmation message, and modification request message is sent to source SeNB.Please in modification The transport Layer address such as GTP TEID that target SeNB distribution is carried in message are sought, the purpose is to set up source The interface in the user plane of downlink data shunting service is provided between SeNB and target SeNB for UE.Source SeNB On bearer types split bearer are changed to by SCG bearer.

MeNB is sent to mesh after receiving the transport Layer address such as GTP TEID of the distribution from source SeNB SeNB is marked, so that UE is established as between source SeNB and target SeNB provides upstream data shunting clothes The interface in the user plane of business.Specifically include：

Source SeNB sends modification request confirmation message to MeNB.Carried in modification request confirmation message The promising up RLC data PDU for receiving the split bearer set up and the transport Layer address such as GTP that distributes TEID；

MeNB sends X2 after confirmation message is asked in the modification for receiving source SeNB, to target SeNB and led to Know message.The transport Layer address such as GTP TEID of active SeNB distribution are carried in X2 notification messages, The purpose is to set up between source SeNB and target SeNB for UE provide upstream data shunting service user Face interface.

Meanwhile, this step also includes：MeNB receive source SeNB modification ask confirmation message after, Wireless heterogeneous networks towards UE are constituted according to information entrained in the admission confirmation message received (RRC, Radio Resource Control) signaling is simultaneously sent to UE.UE is being received from MeNB Instruction one or more SCG bearer are transferred to target SeNB RRC signaling from source SeNB Afterwards, according to the information carried in RRC signaling, synchronize, sent out to target SeNB with target SeNB Stochastic accessing is played, SCG bearer are set up according to new configuration, and set up corresponding split bearer agreements Entity.

Step 501：In reconfiguration course, up RLC data PDU is transmitted to source by target SeNB Descending PDCP data PDU is diverted to target SeNB and holding and UE number by SeNB, source SeNB According to transmission until reconfiguring success.

Source SeNB can be by distributing to receive the split bearer set up descending PDCP PDU Transport Layer address such as GTP TEID, target is diverted to by part or all of descending PDCP data PDU SeNB is transmitted；

Target SeNB can be by the split bearer set up for reception up RLC data PDU The transport Layer address of distribution such as GTP TEID, source SeNB is transmitted to by up RLC data PDU.

It should be noted that the corresponding RLC controls PDU of up RLC data PDU can be by source SeNB directly feeds back；Target SeNB can also be notified by source SeNB, then be fed back by target SeNB.

For split bearer, specifically,

On the uplink, data are shunted between source SeNB PDCP layers and rlc layer, are sent out respectively Give source SeNB and target SeNB is transmitted, the association only set up under PDCP layers on target SeNB Discuss entity；UE is received from eating dishes without rice or wine after two-way downlink data, is merged at PDCP layers；

On uplink, data are shunted between UE rlc layer and MAC, respectively by eating dishes without rice or wine It is sent to the protocol entity only set up under rlc layer on source SeNB and target SeNB, target SeNB； Target SeNB is received after upstream data, is sent to source SeNB, and in source, SeNB rlc layer is closed And.

Wherein, source SeNB is that the descending PDCP data PDU in part is diverted into target SeNB to be passed It is defeated, or by all descending PDCP data PDU be diverted to target SeNB be transmitted it is contemplated that：

When source, SeNB signal qualitys are also relatively good, and source SeNB can be only by a part of descending PDCP numbers Target SeNB is diverted to according to PDU, and keeps the data transfer with UE；When source SeNB signal qualitys Very poor, most of or even whole descending PDCP data PDCU can be diverted to mesh by source SeNB SeNB is marked, still, now because UE does not access target SeNB, UE data transmission throughput also It will be slightly decreased.Visible from here, the inventive method selects to disconnect according to source SeNB signal quality Or keep and source SeNB data transfer, so, the SeNB signal qualitys also relatively good feelings in source Under condition, UE is allowed to maintain the signal transmission with source SeNB.

After the step 500 of the inventive method, also include：

On the one hand, after UE accesses target SeNB and completes config update, if target SeNB is Receive the descending PDCP data PDU of shunting from source SeNB by X2-U, target SeNB start by After the underlying protocol entity processing that descending PDCP data PDU passes through split bearer, UE is sent to.

On the other hand, UE accesses target SeNB and completed after config update, can begin through and target The corresponding split bearer of SeNB and/or SCG bearer protocol entities, send up to target SeNB Packet.

After MeNB, which receives the RRC connections from UE, reconfigures completion message, this method also includes： MeNB initiates path integration program, the descending tunnel of all or part of downlink data carrying of request to core net The change of road end points.

When source SeNB receives the end of identification from S-GW,

It is after all downlink data packets distribute No. SN of PDCP sublayers, to target SeNB in source SeNB Send SN state transfer message, target SeNB according to SN state transfer message, can start for from S-GW receives No. SN of downlink data packet distribution PDCP sublayers；

After source SeNB completes the transmission and/or forwarding of all downlink datas, carry out source is asked to MeNB SeNB discharges.

And target SeNB also can delete split bearer protocol entities to MeNB requests.In request MeNB Before deleting split bearer protocol entities, target SeNB, which has been successfully transmitted, all down forwards number According to, or, request MeNB delete split bearer protocol entities before, target SeNB from SCG bearer protocol entities receive the upstream data bag from UE, and it is up to have completed all forwardings The sequence of packet.

The source of release SeNB from source SeNB and target SeNB is received in MeNB and deletes split After the message of bearer protocol entities, MeNB sends SeNB release confirmation messages (SeNB to source SeNB Release confirm), send SeNB modification confirmation messages (SeNB modification to target SeNB Confirm), send RRC connections reconfiguration message to UE and require that UE deletes correspondence split bearer.

Fig. 6 is to realize the schematic flow sheet of the embodiment reconfigured in dual link of the present invention, as shown in fig. 6, The present embodiment describes MeNB in the present invention and received after UE measurement reports, and the user plane to UE is held It is loaded into the flow of row transfer.Transfer the execution stage, MeNB except request target SeNB be UE in source SCG bearer on SeNB are performed outside acceptance judging, in addition it is also necessary to which target SeNB is the SCG for allowing to receive Bearer sets up corresponding split bearer protocol entities.Specifically include following steps：

Step 601：MeNB reports that (or other radio resource management functions are drawn according to UE measurement As a result, such as overload) make the decision for needing user plane to reconfigure, it is assumed that and decision is by the UE User plane bearer allows the UE to continue from auxiliary from the source SeNB target SeNB being transferred under same MeNB Serving BS obtains communication service.

Step 602：MeNB sends to target SeNB and receives request message.

Wherein, request message is received to remove with reference to related protocol X2-AP message (SeNB addition request) And carry outside key information, UE security capabilities information, SCG bearer configuration informations etc., also at least carry There are split bearer configuration informations or set up split bearer configured information.Wherein, split bearer are configured Information sets up split bearer configured information for that will be transferred to be one or more on the SeNB of source SCG bearer on target SeNB set up corresponding split bearer protocol entities on target SeNB.

For split bearer,

On the uplink, data are shunted between source SeNB PDCP layers and rlc layer, are sent out respectively Give source SeNB and target SeNB is transmitted, the association only set up under PDCP layers on target SeNB Discuss entity.UE is received from eating dishes without rice or wine after two-way downlink data, merged at PDCP layers '

On uplink, data are shunted between UE rlc layer and MAC, respectively by eating dishes without rice or wine It is sent to the protocol entity only set up under rlc layer on source SeNB and target SeNB, target SeNB. Target SeNB is received after upstream data, is sent to source SeNB, and in source, SeNB rlc layer is closed And.

Step 603：Target SeNB is received after receiving request message, is judged with reference to the resource situation of itself UE whether can be received to access.Implementing for this step is well known to those skilled in the art, and without In limiting protection scope of the present invention, repeat no more here.

Step 604：If target SeNB judges that UE access can be received, reply and connect to MeNB Receive confirmation message, removed in admission confirmation message with reference to related protocol X2-AP message (SeNB addition Request acknowledge) and carry target SeNB and agree to outside the SCG bearer lists of receiving, also extremely The transport Layer address for carrying promising reception split bearer descending PDCP data PDU less and distributing is such as GTP TEID。

Step 605：MeNB is received after admission confirmation message, and modification request message is sent to source SeNB. Wherein, modification request message notifies the GTP that source SeNB is received from target SeNB by admission confirmation message TEID, the purpose is to set up between source SeNB and target SeNB for UE provide downlink data shunting clothes The interface in the user plane of business.So, under source SeNB can be incited somebody to action partly or entirely by the GTP TEID Row PDCP data PDU, are diverted to target SeNB by X2-U and are transmitted.On the SeNB of source Bearer types are changed to split bearer by SCG bearer.

Step 606：Source SeNB sends modification request confirmation message to MeNB, notifies MeNB configurations It is successfully modified.Wherein, the upper of the promising reception split bearer is also carried in modification request confirmation message Row RLC data PDU and the GTP TEID distributed.

In this step, in source SeNB to MeNB send modification request confirmation message while or afterwards, The GTP TEID that source SeNB begins through target SeNB offers will part or all of descending PDCP data PDU is diverted to target SeNB.

Wherein, if source SeNB signal qualitys are also relatively good, source SeNB can only will be a part of descending PDCP data PDU is diverted to target SeNB, and keeps the data transfer with UE.If source SeNB Signal quality is very poor, and source SeNB can be by most of or even whole descending PDCP data PDCU Target SeNB is diverted to, but in this case, because UE does not access target SeNB, UE also Data transmission throughput will be slightly decreased.

In this step, in source SeNB to MeNB send modification request confirmation message while or afterwards, Source SeNB starts the upstream data bag that sequence has not been completed being sent to target SeNB.Meanwhile, source The ranking function of SeNB PDCP layers is stopped；Source SeNB is by all up PDCP being successfully received After data PDU decryption, target SeNB is sent, completes to sort by target SeNB PDCP layers.

Step 607：MeNB is after confirmation message is asked in the modification for receiving source SeNB, to target SeNB Send X2 notification messages.Wherein, X2 notification messages are used to notify that target SeNB passes through from source SeNB The modification request GTP TEID that receive of confirmation message, the purpose is to set up source SeNB and target SeNB it Between for UE provide upstream data shunting service interface in the user plane.So, target SeNB can be by this The up RLC data PDU that GTP TEID receive target SeNB from UE, is transmitted to source SeNB.

Step 608：MeNB is after confirmation message is asked in the modification for receiving source SeNB, according to what is received Wireless heterogeneous networks (RRC, Radio of the entrained information composition towards UE in admission confirmation message Resource Control) signaling and it is sent to UE.

Step 609：UE receive the instruction from MeNB by one or more SCG bearer from Source SeNB is transferred to after target SeNB RRC signaling, and judging whether can be according in RRC signaling It is required that performing RRC connection reconfiguration requests.Match somebody with somebody again if it can, UE sends RRC connections to MeNB Completion (RRC Connection Reconfiguration Complete) message is put, indicates that UE has been enabled newly Radio-resource-configuration.

Step 610：UE is synchronized, to target according to the information carried in signaling with target SeNB SeNB initiates Stochastic accessing, sets up SCG bearer according to new configuration, and set up corresponding split bearer Protocol entity.

UE accesses target SeNB and completed after config update, if now target SeNB has passed through X2-U receives the descending PDCP data PDU of shunting from source SeNB, and target SeNB starts will be descending UE is sent to after the underlying protocol entity processing that PDCP data PDU passes through split bearer；

UE accesses target SeNB and completed after config update, can begin through corresponding with target SeNB Split bearer or SCG bearer protocol entities, to target SeNB send upstream data bag.

Step 611：The RRC connections that MeNB receives UE are reconfigured after completion message, are sent out to core net Play path integration program, the change of the downlink tunnel end points of all or part of downlink data carrying of request.

Step 612：Source SeNB receives the end of identification from S-GW, and is all downlink data packets point After No. SN with PDCP sublayers, SN state transfer message, target SeNB are sent to target SeNB According to SN state transfer message, it can start to receive downlink data packet distribution PDCP from S-GW No. SN of floor.

Step 613：Source SeNB receives the end of identification from S-GW, and completes all downlink datas After sending and/or forwarding, request MeNB carries out source SeNB releases.

Step 614：Target SeNB requests MeNB deletes split bearer protocol entities.

Before request MeNB deletes split bearer protocol entities, target SeNB has been successfully transmitted All down forwards data.And,

Before request MeNB deletes split bearer protocol entities, target SeNB is from SCG Bearer protocol entities receive the upstream data bag from UE, and have completed all forwarding uplink data bags Sequence.

Step 615：After the message during MeNB receives above-mentioned steps 613 and step 614, MeNB SeNB releases, which are sent, to source SeNB confirms (SeNB release confirm) message；To target SeNB Send SeNB modifications and confirm (SeNB modification confirm) message；RRC is sent to UE to connect Connect reconfiguration message and require that UE deletes correspondence split bearer.

Fig. 7 is the schematic diagram of the first embodiment of user plane protocol entity of the present invention and downlink data transmission, First embodiment describes path integration and completes opisthogenesis SeNB, the user on target SeNB and UE to put down Face protocol entity and a kind of downlink data transmission schematic diagram.As shown in Figure 7, it is assumed that source SeNB has been passed Defeated No. SN be 1 to 5 PDCP data PDU, when reconfiguring generation, UE has only received No. SN PDCP data PDU for 1,2 and 4 simultaneously confirms to source SeNB.It is 3 and 5 for No. SN PDCP data PDU, UE only received part RLC data PDU.Now, if source SeNB Signal quality has been not enough to support to continue to send data to UE, and No. SN can be 3 and 5 by source SeNB PDCP data PDU be transmitted to target SeNB, by target SeNB split bearer protocol entities Handle and send.It is all not started to also under transmission from what S-GW was received before receiving end of identification Row data, such as No. SN is 6 to 9 PDCP data SDU, after all being handled via PDCP layers, is turned Target SeNB is issued, is handled and is sent by target SeNB split bearer protocol entities.

For downlink data, UE PDCP entities completions corresponding with source SeNB are all to submit number to upper strata According to work after, PDCP entities corresponding with target SeNB just start to upper strata data delivery, it is to avoid Upper strata receives out of order packet.

Fig. 8 is the schematic diagram of the second embodiment of user plane protocol entity of the present invention and downlink data transmission, Second embodiment describes path integration and completes opisthogenesis SeNB, the user on target SeNB and UE to put down Face protocol entity and a kind of downlink data transmission schematic diagram.As shown in Figure 8, it is assumed that source SeNB has been passed Defeated No. SN be 1 to 5 PDCP data PDU, when reconfiguring generation, UE has only received No. SN PDCP data PDU for 1,2 and 4 simultaneously confirms to source SeNB.It is 3 and 5 for No. SN PDCP data PDU, UE only received part RLC data PDU.Now, at least at one section In, source SeNB can also continue to keep the data transfer between UE, and source SeNB at least may proceed to It is the 3 and 5 corresponding RLC for not receiving UE confirmation replies also of PDCP data PDU to send No. SN Data PDU or RLC data PDU is segmented.It is all to be received from S-GW before end of identification is received Do not start to also send downlink data, such as No. SN be 6 to 9 PDCP data SDU, all via After PDCP layers of processing, it is diverted to source SeNB or target SeNB and sends.As shown in fig. 7, source SeNB Before end of identification is received, the PDCP data SDU that No. SN is 6,7,8,9 can be also received, via After PDCP layers of processing, source SeNB is diverted to target SeNB by No. SN for 8,9 PDCP data PDU Send, and source SeNB transmissions are stayed in for 6,7 PDCP data PDU by No. SN, it is ensured that UE When synchronizing and accessing to target SeNB, still certain data are kept between UE and source SeNB Transmission.

Fig. 9 is the schematic diagram of the 3rd embodiment of user plane protocol entity of the present invention and transmitting uplink data, 3rd embodiment is described after the completion of path integration, the user on source SeNB, target SeNB and UE Plane protocol entity and transmitting uplink data schematic diagram.As shown in Figure 9, it is assumed that UE has transmitted SN Number be 1 to 5 PDCP data PDU, when reconfiguring generation, source SeNB has only received No. SN and has been 1,2 and 4 PDCP data PDU simultaneously confirms to UE.For the PDCP that No. SN is 3 and 5 Data PDU, source SeNB have only received part RLC data PDU.

Now, if the signal quality between source SeNB and UE can not support UE to source SeNB Data are sent, will can not send or not have for 3 and 5 PDCP data PDU, UE for No. SN Successful RLC data PDU or RLC data PDU segmentations are sent, it is real by split bearer agreements Body is sent to target SeNB.Target SeNB receives the RLC data PDU or RLC data PDU After segmentation, RLC data PDU or RLC data PDU segmentations are transmitted to source SeNB, by source SeNB is combined into the PDCP data PDU that No. SN is 3 and 5.Subsequent upstream packet, such as No. SN For 6 and later packet, UE is handled using SCG bearer protocol entities corresponding with target SeNB After be sent to target SeNB.

For upstream data, target SeNB is after source SeNB is completed to S-GW data deliveries, Start to S-GW data deliveries, it is to avoid upper strata receives out of order packet.

Figure 10 is the schematic diagram of the fourth embodiment of user plane protocol entity of the present invention and transmitting uplink data, Fourth embodiment is described after the completion of path integration, the user on source SeNB, target SeNB and UE Plane protocol entity and transmitting uplink data schematic diagram.As shown in Figure 10, it is assumed that UE has transmitted SN Number be 1 to 5 PDCP data PDU, when reconfiguring generation, source SeNB has only received No. SN and has been 1,2 and 4 PDCP data PDU simultaneously confirms to UE.For the PDCP that No. SN is 3 and 5 Data PDU, source SeNB have only received part RLC data PDU.

Now, if the signal quality between source SeNB and UE is also good enough, at least, for No. SN Can be by without transmission or without the successful RLC data of transmission for 3 and 5 PDCP data PDU, UE PDU or RLC data PDU is segmented, and source SeNB is sent to by split bearer protocol entities, and and RLC data PDU or RLC data PDU piecewise combinations have been received into the PDCP that No. SN is 3 and 5 Data PDU.Subsequent upstream packet, such as No. SN be 6 and later packet, UE can use and Target SeNB is sent to after the corresponding SCG bearer protocol entities processing of target SeNB.

Figure 11 is the composition structural representation of main serving BS of the invention, as shown in figure 11, is at least included First processing units, provide upstream data service for UE for setting up between source SeNB and target SeNB The interface in the user plane serviced with downlink data.Wherein,

First processing units include：First sets up module, and second sets up module；Wherein,

First sets up module, for will be sent to source SeNB from the target SeNB transport Layer address distributed, So as to be established as the user plane that UE provides downlink data shunting service between source SeNB and target SeNB Interface；

Second sets up module, and mesh is sent to after the transport Layer address for receiving the distribution from source SeNB SeNB is marked, and so that UE is established as between source SeNB and target SeNB provides upstream data shunting The interface in the user plane of service；Constitute the RRC signaling towards UE and be sent to UE.

Wherein, first set up module and be additionally operable to：It is one or more on the SeNB of source to indicate target SeNB The SCG bearer that will be transferred on target SeNB set up corresponding split bearer protocol entities.

Wherein,

First set up module specifically for：Sent to target SeNB and carry split bearer configuration informations Or set up the receiving request message of split bearer configured information.Wherein, split bearer configuration informations or Setting up split bearer configured information is used to that to be one or more on the SeNB of source target will to be transferred to SCG bearer on SeNB set up corresponding split bearer protocol entities on target SeNB；

Receive the promising descending PDCP numbers for receiving the split bearer set up of carrying from target SeNB The admission confirmation message for the transport Layer address distributed according to PDU, sends to source SeNB and carries target The modification request message of the transport Layer address of SeNB distribution.

Second set up module specifically for：Receive the promising split for receiving foundation of carrying from source SeNB Bearer up RLC data PDU and the transport Layer address distributed modification request confirmation message；To mesh Mark SeNB and send the up RLC numbers to receive the split bearer set up for carrying active SeNB distribution The X2 notification messages for the transport Layer address distributed according to PDU；According in the admission confirmation message received Entrained information constitutes the RRC signaling towards UE and is sent to UE.

Further,

Second, which sets up module, is additionally operable to：Completion message is reconfigured when receiving the connections of the RRC from UE, to Core net initiates path integration program, the downlink tunnel end points of all or part of downlink data carrying of request Change.

Figure 12 is the composition structural representation of auxiliary serving BS of the invention, as shown in figure 12, is at least included： Second processing unit, and/or the 3rd processing unit；Wherein,

Second processing unit, for according to the instruction from MeNB, being one or more on the SeNB of source The SCG bearer that will be transferred on target SeNB set up corresponding split bearer protocol entities；For Receive the split bearer set up descending PDCP data PDU and distribute transport Layer address；Reception comes from The transport Layer address of MeNB source SeNB distribution, is established as between source SeNB and target SeNB UE provides the interface in the user plane of upstream data shunting service.Specifically for：

Receive the finger for carrying split bearer configuration informations or setting up split bearer from MeNB Show the receiving request message of information, be one or more on the SeNB of source will be transferred on target SeNB SCG bearer corresponding split bearer protocol entities are set up on target SeNB；

To MeNB send carry it is promising receive set up split bearer descending PDCP data PDU and The admission confirmation message of the transport Layer address of distribution；

Receive the upper of the split bearer set up for reception that the active SeNB of carrying from MeNB is distributed Row RLC data PDU and distribute transport Layer address modification request confirmation message；Set up source SeNB and The interface in the user plane of upstream data shunting service is provided between target SeNB for UE；

In reconfiguration course, up RLC data PDU is transmitted to source SeNB.

3rd processing unit, is divided with the up RLC data PDU of the split bearer to receive foundation With transport Layer address；Receive the transport Layer address of the distribution of the target SeNB from MeNB；In source SeNB The interface in the user plane that UE provides downlink data shunting service is established as between target SeNB.Specifically for：

Receive the modification request message of the transport Layer address for carrying target SeNB distribution from MeNB； Set up between source SeNB and target SeNB and the interface in the user plane of downlink data shunting service is provided for UE；

To MeNB send carry it is promising receive set up split bearer up RLC data PDU and The modification request confirmation message of the transport Layer address of distribution；

In reconfiguration course, descending PDCP data PDU is diverted to target SeNB.

3rd processing unit is additionally operable to：The data transfer with UE is kept until reconfiguring success.

Further,

3rd processing unit is additionally operable to：It is all downlink data packets when receiving the end of identification from S-GW After distribute PDCP sublayers No. SN, SN state transfer message is sent to target SeNB, completes all After the transmission and/or forwarding of downlink data, carry out source SeNB releases are asked to MeNB；Correspondingly,

Second processing unit is additionally operable to：According to SN state transfer message, start to receive down from S-GW No. SN of row allocation of packets PDCP sublayers；Be successfully transmitted it is all down forward data, Or, the upstream data bag from UE is received from SCG bearer protocol entities, and completed The sequence of all forwarding uplink data bags, split bearer protocol entities are deleted to MeNB requests；

Now,

Second in main serving BS, which sets up module, is additionally operable to：Receive from source SeNB and target SeNB Source of release SeNB and delete split bearer protocol entities message, to source SeNB send SeNB release Confirmation message is put, SeNB modification confirmation messages is sent to target SeNB, RRC connections is sent to UE Reconfiguration message requires that UE deletes correspondence split bearer.

The above, is only the preferred embodiments of the present invention, is not intended to limit the protection model of the present invention Enclose.Within the spirit and principles of the invention, any modifications, equivalent substitutions and improvements done etc., It should be included within the scope of the present invention.

Claims

1. realize the method reconfigured in a kind of dual link, by UE user plane bearer from source SeNB In the reconfiguration course for being transferred to the target SeNB under same MeNB, it is characterised in that including：

2. according to the method described in claim 1, it is characterised in that this method also includes：The source SeNB keeps the data transfer with the UE until reconfiguring success.

3. according to the method described in claim 1, it is characterised in that described to set up before interface in the user plane Also include：

4. method according to claim 3, it is characterised in that described to set up source SeNB and target Include between SeNB for the UE interfaces in the user plane for providing upstream data service and downlink data service：

5. method according to claim 3, it is characterised in that the MeNB indicates target SeNB Set up corresponding for one or more SCG bearer that will be transferred on target SeNB on the SeNB of source Split bearer protocol entities include：

6. method according to claim 4, it is characterised in that the MeNB will come from target The transport Layer address of SeNB distribution is sent to source SeNB, so that between source SeNB and target SeNB Being established as the interface in the user plane of UE offer downlink data shunting services includes：

7. method according to claim 4, it is characterised in that the MeNB receives the source of coming from Target SeNB is sent to after the transport Layer address of SeNB distribution, so that in source SeNB and target SeNB Between be established as UE provide upstream data shunting service interface in the user plane include：

8. the method according to any one of claim 2~7, it is characterised in that this method also includes：

9. according to the method described in claim 1, it is characterised in that the target SeNB will be up RLC data PDU, which is transmitted to source SeNB, to be included：Pass through the upper of the split bearer for the reception foundation Row RLC data PDU and the transport Layer address distributed, up RLC data PDU are transmitted to described Source SeNB；

10. according to the method described in claim 1, it is characterised in that for the split of the foundation Bearer,

11. method according to claim 4, it is characterised in that described to set up source SeNB and mesh , should after the interface in the user plane that upstream data service and downlink data service are provided between mark SeNB for UE Method also includes：

12. method according to claim 4, it is characterised in that described to set up source SeNB and mesh , should after the interface in the user plane that upstream data service and downlink data service are provided between mark SeNB for UE Method also includes：

13. the method according to claim 3,4,11 or 12, it is characterised in that when the source When SeNB receives the end of identification from S-GW, this method also includes：

14. a kind of main serving BS, it is characterised in that including first processing units, for setting up source SeNB The interface in the user plane of upstream data service and downlink data service is provided between target SeNB for UE.

15. main serving BS according to claim 14, it is characterised in that first processing is single Member sets up module including first, and second sets up module；Wherein,

16. main serving BS according to claim 15, it is characterised in that described first sets up mould Block is additionally operable to：Indicate that the target SeNB will be transferred to institute to be one or more on the source SeNB State the SCG bearer on target SeNB and set up corresponding split bearer protocol entities.

17. main serving BS according to claim 16, it is characterised in that described first sets up mould Block specifically for：

18. main serving BS according to claim 15, it is characterised in that described second sets up mould Block specifically for：

19. main serving BS according to claim 18, it is characterised in that described second sets up mould Block is additionally operable to：

20. a kind of auxiliary serving BS, it is characterised in that including：Second processing unit, and/or at the 3rd Manage unit；Wherein,

21. auxiliary serving BS according to claim 20, it is characterised in that the second processing list Member specifically for：

In reconfiguration course, up RLC data PDU is transmitted to the source SeNB.

22. auxiliary serving BS according to claim 20, it is characterised in that the 3rd processing is single Member specifically for：

23. auxiliary serving BS according to claim 22, it is characterised in that the 3rd processing is single Member is additionally operable to：The data transfer with the UE is kept until reconfiguring success.

24. the auxiliary serving BS according to any one of claim 20~23, it is characterised in that

3rd processing unit is additionally operable to：It is all lower line numbers when receiving the end of identification from S-GW After No. SN of bag distribution PDCP sublayers, SN state transfer message is sent to the target SeNB, After the transmission and/or forwarding that complete all downlink datas, the source SeNB is carried out to MeNB requests Release；Correspondingly,