CN107889234A

CN107889234A - The method and its equipment of a kind of data forwarding

Info

Publication number: CN107889234A
Application number: CN201610872178.4A
Authority: CN
Inventors: 肖芳英; 刘仁茂; 山田升平
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2016-09-30
Filing date: 2016-09-30
Publication date: 2018-04-06
Also published as: WO2018059148A1

Abstract

The method and corresponding prothetic group station and master base station performed the invention provides the method performed by prothetic group station, master base station.The method that prothetic group station performs is used to forward data to master base station, and prothetic group station and master base station cooperate with to user equipment and send data.This method includes：Downlink data transmission status frames are received from master base station；And the data that sent according to the downlink data transmission status frames received to master base station forwarding to user equipment.Wherein, downlink data transmission status frames are used to inform that master base station has had correctly received or the data that do not receive and/or the data for being successfully transmitted to user equipment to prothetic group station.Such scheme can avoid such as prothetic group station from forwarding those to be successfully sent to master base station but the problem of user equipment (UE) not yet confirms to receive successful data.

Description

The method and its equipment of a kind of data forwarding

Technical field

This disclosure relates to wireless communication technology field, more specifically, this disclosure relates to a kind of data forwarding method and its setting It is standby.

Background technology

In March, 2016, in third generation partner program (3rd Generation Partnership Project： 3GPP) in RAN#71 plenary session, NTT DOCOMO propose a new research project on 5G technical standards (referring to non-special Sharp document：RP-160671：New SID Proposal：Study on New Radio Access Technology), and obtain Approval.The purpose of the research project is to develop a new wireless (New Radio：NR) access technology with meet 5G it is all should With scene, demand and deployed environment.NR mainly has three application scenarios：Mobile broadband communication (the Enhanced Mobile of enhancing Broadband：EMBB), large-scale machines class communication (massive Machine Type Communication：MMTC it is) and super Reliable low latency communication (Ultra Reliable and Low Latency Communications：URLLC).Ground according to this Study carefully a goal programming, NR two stages of standardization point are carried out：The standardization effort of first stage will be completed in mid-terms in 2018； The standardization effort of second stage will be completed in the end of the year 2019.The standard criterion of first stage wants forward compatibility in second stage Standard criterion, and the standard criterion of second stage will be established on standard criterion in the first stage, and meet 5G NR technical bids Accurate is required.

In existing user plane data transfer mode, it is understood that there may be such situation：User face data at prothetic group station and Transmitted between core net or core net of future generation, a part of data are transmitted using the Radio Resource at prothetic group station, another part number According to being sent to/from master base station by the interface between prothetic group station and master base station and be transmitted using the resource of master base station.If Need to carry out Deta bearer when carrying out downlink data transmission using the mode to reconfigure, such as by secondary cell group (Secondary Cell Group：SCG) separation carrying (can be LTE-NR or eLTE-NR or NR-LTE or NR-eLTE or LTE-eLTE or ELTE-LTE SCG separation carrying) reconfigure as main plot group (Master Cell Group：MCG) carrying (LTE-NR or ELTE-NR or NR-LTE or NR-eLTE or LTE-eLTE or eLTE-LTE MCG carrying), it may be necessary to according to carrying configure into The forwarding operation of row data, the data forwarding operation can use data forwarding flow during switching.Because partial data exists Reconfigure before SCG separation is carried as MCG carryings and be transmitted to master base station.Therefore, prothetic group station how is avoided to forward those Being successfully sent to master base station, still user equipment (UE) not yet confirms that it is to need to solve the problems, such as to receive successful data.

The content of the invention

For some in solving the above problems, the present disclosure proposes the side that the method performed by prothetic group station, master base station perform Method and corresponding prothetic group station and master base station.

According to the scheme of the present invention, it is proposed that a kind of side for being used to forward data to master base station performed from prothetic group station Method, the prothetic group station and the master base station cooperate with to user equipment and send data, and methods described includes.This method includes：From master Base station receives downlink data transmission status frames；And will be to master base station forwarding according to the downlink data transmission status frames received The data that user equipment is sent.Wherein, downlink data transmission status frames are used to inform that master base station is correctly received to prothetic group station To or the data that do not receive and/or the data for being successfully transmitted to user equipment.Such scheme can avoid such as prothetic group station Those are forwarded to be successfully sent to master base station but the problem of user equipment (UE) not yet confirms to receive successful data.

According to another aspect of the present invention, it is proposed that a kind of prothetic group station, for forwarding data to master base station.Wrap at prothetic group station Include：Receiving unit, for receiving downlink data transmission status frames from the master base station；And retransmission unit, for according to reception The data that the downlink data transmission status frames arrived will be sent to master base station forwarding to the user equipment, wherein, under described Row data transmission state frame is used to inform data that the master base station had correctly received or do not received to the prothetic group station And/or successfully it is transmitted to the data of the user equipment.

According to the yet another aspect of the present invention, it is proposed that a kind of method performed by master base station, master base station and the prothetic group station Cooperate with to user equipment and send data.Method includes：Generate downlink data transmission status frames, the downlink data transmission status frames For informing that the master base station has had correctly received or the data that do not receive and/or successfully forwarded to the prothetic group station Data to the user equipment；The downlink data transmission status frames are sent to the prothetic group station；And receive the prothetic group Stand based on the downlink data transmission status frames send data.According to the yet another aspect of the present invention, there is provided a kind of master base station, Master base station and the prothetic group station cooperates with to user equipment and sends data.Master base station includes：State instruction generation unit, for generating Downlink data transmission status frames, the downlink data transmission status frames are used to inform the master base station just to the prothetic group station The true data for receiving or not receiving and/or the data for being successfully transmitted to the user equipment；Transmitting element, for The prothetic group station sends the downlink data transmission status frames；And receiving unit, for receiving the prothetic group station based on described The data that downlink data transmission status frames are sent.

The such scheme of the present invention to prothetic group station by informing data that master base station had correctly received or do not received And/or be successfully transmitted to the data of user equipment, avoid for example reconfigure SCG separation be carried as MCG carrying when, prothetic group Stand forwarding those be successfully sent to master base station but the problem of user equipment (UE) not yet confirms to receive successful data.

Brief description of the drawings

By the detailed description below in conjunction with accompanying drawing, above and other feature of the disclosure will become more apparent, its In：

Fig. 1 shows the schematic diagram of NR-eLTE dual link deployment scenarios；

Fig. 2 shows the schematic diagram of NR-NR dual link deployment scenarios；

Fig. 3 shows the schematic diagram of LTE-NR dual link deployment scenarios；

Fig. 4 shows the schematic diagram of eLTE-NR dual link deployment scenarios；

Fig. 5 shows the entity of radio protocol layer 2 being related in LTE dual link deployment way；

Fig. 6 shows the method according to embodiments of the present invention that be used for master base station forwarding data performed from prothetic group station Example flow diagram；

Fig. 7 shows the exemplary reduced structure at the prothetic group station corresponding with method shown in Fig. 6；

Fig. 8 shows the example flow diagram of the method according to embodiments of the present invention performed by master base station；And

Fig. 9 shows the exemplary reduced structure of the master base station corresponding with method shown in Fig. 8.

Embodiment

The disclosure is described in detail with reference to the accompanying drawings and detailed description.It should be noted that the disclosure does not answer office It is limited to embodiment described below.In addition, for simplicity eliminate pair does not have the public affairs of direct correlation with the disclosure The detailed description of technology is known, to prevent understanding of this disclosure from causing to obscure.

Part term of the present invention is described below, if not otherwise specified, term use of the present invention is fixed herein Justice.The present invention is by taking dual link as an example, but the method for the invention is not limited to dual link scene, and those skilled in the art can hold Easy expands to multi-link scene.In addition, the present invention is by taking LTE, eLTE, NR and corresponding core net and core net of future generation as an example Illustrate, it should be noted that the present invention is not limited to described LTE, eLTE, NR and corresponding core net and core of future generation Net, it can be used for other wireless communication systems of evolution, such as 6G wireless communication systems.

In the present invention, chain of command is referred to as master base station with the base station that EPC or of future generation core nets are connected under dual link MeNB, NR MgNB, LTE MeNB and eLTE MeNB one or more can be included.Chain of command not with EPC or of future generation cores Heart net, which connects (not being master base station) but the base station of transfer resource is provided for user plane data transfer, is referred to as prothetic group station SeNB, can be with One or more comprising NR SgNB, LTE SeNB and eLTE SeNB.

The X-YMCG carryings being related in the present invention refer to that MeNB is X, and SeNB is Y and the radio protocol layer of the carrying The resource that (radio protocols) is located in X and provided using X.The X can be NR MgNB, LTE MeNB or eLTE MeNB；The Y can be NR SgNB, LTE SeNB or eLTE SeNB.

X-Y SCG carryings refer to that MeNB is X, and SeNB is Y and the radio protocol layer (radio protocols) of the carrying The resource provided in Y and using Y.The X can be NR MgNB, LTE MeNB or eLTE MeNB；The Y can be NR SgNB, LTE SeNB or eLTE SeNB.

X-Y MCG separation carryings refer to that master base station is X, and prothetic group station is Y and the radio protocol layer (radio of the carrying Protocols) it is located in X and Y, terminates in X with the user face data of EPC or of future generation core nets but provided simultaneously using X and Y Resource.The X can be NR MgNB, LTE MeNB or eLTE MeNB；The Y can be NR SgNB, LTE SeNB or eLTE SeNB。

X-Y SCG separation carryings refer to that master base station is X, and prothetic group station is Y and the radio protocol layer (radio of the carrying Protocols) it is located in X and Y, terminates in Y with the user face data of EPC or of future generation core nets but provided simultaneously using X and Y Resource.The X can be NR MgNB, LTE MeNB or eLTE MeNB；The Y can be NR SgNB, LTE SeNB or eLTE SeNB。

X MCG carryings refer to that MeNB is X, and SeNB can be NR SgNB, LTE SeNB or eLTE SeNB.The carrying The resource that radio protocol layer (radio protocols) is located in X and provided using X.The X can be NR MgNB, LTE MeNB or eLTE MeNB.

X SCG carryings refer to that MeNB is X, and SeNB can be NR SgNB, LTE SeNB or eLTE SeNB.The carrying The resource that radio protocol layer (radio protocols) is located in SeNB and provided using SeNB.The X can be NR MgNB, LTE MeNB or eLTE MeNB.

X MCG separation carryings refer to that MeNB is X, and SeNB can be NR SgNB, LTE SeNB or eLTE SeNB.It is described to hold The radio protocol layer (radio protocols) of load is located in X and SeNB, the user face data with EPC or of future generation core nets Terminate in X simultaneously while the resource of X and SeNB offers is provided.The X can be NR MgNB, LTE MeNB or eLTE MeNB.

X SCG separation carryings refer to that MeNB is X, and SeNB can be NR SgNB, LTE SeNB or eLTE SeNB.It is described to hold The resource that the radio protocol layer (radio protocols) of load is located in X and SeNB and provided simultaneously using X and SeNB.The X Can be NR MgNB, LTE MeNB or eLTE MeNB.

NR MCG are carried：One in NR-eLTE MCG carryings, NR-NR MCG carryings, NR-LTE MCG carryings can be included Kind is a variety of.

LTE MCG are carried：It can include in LTE-eLTE MCG carryings, LTE-NR MCG carryings, LTE-LTE MCG carryings One or more.

ELTE MCG are carried：ELTE-eLTE MCG carryings can be included, eLTE-NR MCG are carried, eLTE-LTE MCG are held One or more in load.

NR SCG are carried：One in NR-eLTE SCG carryings, NR-NR SCG carryings, NR-LTE SCG carryings can be included Kind is a variety of.

LTE SCG are carried：It can include in LTE-eLTE SCG carryings, LTE-NR SCG carryings, LTE-LTE SCG carryings One or more.

ELTE SCG are carried：ELTE-eLTE SCG carryings can be included, eLTE-NR SCG are carried, eLTE-LTE SCG are held One or more in load.

NR MCG separation carryings：NR-eLTE MCG separation carrying, NR-NR MCG separation carrying, NR-LTE can be included One or more in MCG separation carryings.

LTE MCG separation carryings：LTE-eLTE MCG separation carrying, LTE-NR MCG separation carrying, LTE- can be included One or more in LTE MCG separation carryings.

ELTE MCG separation carryings：Can include eLTE-eLTE MCG separation carrying, eLTE-NR MCG separation carrying, One or more in eLTE-LTE MCG separation carryings.

NR SCG separation carryings：NR-eLTE SCG separation carrying, NR-NR SCG separation carrying, NR-LTE can be included One or more in SCG separation carryings.

LTE SCG separation carryings：LTE-eLTE SCG separation carrying, LTE-NR SCG separation carrying, LTE- can be included One or more in LTE SCG separation carryings.

ELTE SCG separation carryings：Can include eLTE-eLTE SCG separation carrying, eLTE-NR SCG separation carrying, One or more in eLTE-LTE SCG separation carryings.

If not otherwise specified, the MCG carryings in the present invention can include one or more of：NR MCG carryings, LTE MCG carryings, eLTE MCG carryings.SCG carryings can include one or more of：NR SCG are carried, LTE SCG are carried, ELTE SCG are carried.MCG separation carryings can include one or more of：NR MCG separation carrying, LTE MCG separation are held Carry, eLTE MCG separation carryings.SCG separation carryings can include one or more of：NR SCG separation carrying, LTE SCG Separation carrying, eLTE SCG separation carryings.

In the present invention assume PDCP PDCP entities be realized in MeNB and/or SeNB data separating and/ Or the entity of convergence, i.e. user face data pass through PDCP entity handles, a part of data are carried using the base station where PDCP entities The resource of confession is transmitted, and the resource that another part data are sent to/from another base station and provided using the base station is passed It is defeated.Corresponding different MeNB types (such as NR MgNB, LTE MeNB and eLTE MeNB), realize data separating and/or convergence The title of entity may be different, but PDCP entities are collectively referred to as in the present invention, the entity can realize data separating And/or the function of convergence.Be referred to as PDCP protocol Data Units (PDU) by the PDCP downlink data packets handled, according in NR or Realize that the entity name of data separating is different in eLTE, then its title of the data after the entity handles may also be different, But the present invention is collectively referred to as PDCP PDU or is generally known as user data, it is used interchangeably herein both it. Those skilled in the art can also be according to specific name, and the corresponding PDCP PDU that replace are the title.

Main plot group (MCG) is the one group of serving cell associated with master base station, can be with comprising a main plot PCell Include one or more secondary cell SCell.Secondary cell group (SCG) is one group of serving cell with auxiliary base station association, includes one PSCell, one or more SCell can also be included.The PCell is a cell being operated on main carrier frequency, and UE exists Initial connection establishment process is performed in the cell or starts connection reconstruction process or PCell is designated as in handoff procedure.Institute It is SCG cells to state PSCell, and when performing SCG and changing process, UE performs the cell accessed immediately.The SCell be operated in it is auxiliary Cell in carrier frequency, the SCell can be connected in wireless heterogeneous networks and be configured and can provide additionally after RRC is established Radio Resource.It is base station, master base station, auxiliary it should be noted that under different deployment scenarios or in different wireless communication systems The names such as base station, cell, main plot group, secondary cell group, carrying, core net may be different, it is suitable in difference In deployment scenario or different wireless communication systems by the way of different names.

Fig. 1 to Fig. 4 shows the schematic diagram of all kinds connection deployment scenario.

In Fig. 1, NR base stations (NR Node B, referred to as gNB.The gNB is logical node, and the logical node is responsible for In one or more cells to/from user equipment (UE) transmit wirelessly/receive) master base station (being referred to as MgNB) is used as, I.e. chain of command is connected between MgNB and core net of future generation (being referred to as NextGen Core) and carried out.The Long Term Evolution (eLTE) of enhancing Base station (being referred to as eLTE eNB) is used as prothetic group station.User face data stream is by NR base stations and eLTE eNB via core net of future generation Transmission；Specifically, four kinds of user plane data transfer modes be present：Mode a1, user face data is between gNB and core net of future generation Transmit and utilize gNB provide resource (corresponding Deta bearer is referred to as NR-eLTE main plots group (Master Cell Group： MCG) carry)；Mode a2, what user face data was transmitted between eLTE eNB and core net of future generation and provided using eLTE eNB (corresponding Deta bearer is referred to as NR-eLTE secondary cells group (Secondary Cell Group to resource：SCG) carry)；Mode a3, User face data transmits between gNB and core net of future generation, and a part of data utilize gNB radio resource transfer, another portion Data are sent to/from eLTE eNB by the interface between gNB and eLTE eNB and utilize eLTE eNB radio resource transfer (right The Deta bearer answered is referred to as NR-eLTE MCG separation carrying)；Mode a4, user face data is in eLTE eNB and core of future generation Transmitted between net, partial data directly utilizes eLTE eNB radio resource transfer, and another data pass through between gNB and eLTE eNB Interface be sent to/from NR gNB and (corresponding Deta bearer is referred to as NR-eLTE SCG using NR gNB radio resource transfer Separation carrying).In mode a3 and a4, user face data is provided using gNB and eLTE eNB simultaneously via core net of future generation Resource.

In fig. 2, master base station MgNB and prothetic group station SgNB is gNB, i.e. chain of command is connected to MgNB and core of future generation Carried out between net, user face data stream is by MgNB and SgNB via core network of future generation.Specifically, four kinds of user planes be present Data transfer mode：Mode b1, the resource that user face data is transmitted between MgNB and core net of future generation and provided using MgNB Transmission (corresponding Deta bearer is referred to as NR-NR MCG carryings)；Mode b2, user face data is between SgNB and core net of future generation Transmit and utilize the resource that prothetic group station SgNB is provided (corresponding Deta bearer is referred to as NR-NR SCG carryings)；Mode b3, user plane Data are transmitted between MgNB and core net of future generation, and a part of data utilize master base station MgNB radio resource transfer, another Portion's data are sent to/from SgNB by the interface between master base station MgNB and prothetic group station SgNB and utilize SgNB radio resource transfer (corresponding Deta bearer is referred to as NR-NR MCG separation carrying).Mode b4, user face data is between SgNB and core net of future generation Transmission, partial data directly utilize SgNB radio resource transfer, and another data are sent to by the interface between SgNB and MgNB/ Radio resource transfer from MgNB and utilization MgNB (corresponding Deta bearer is referred to as NR-NR SCG separation carrying).Mode b3 In b4, user face data utilizes the resource transmission of MgNB and SgNB offers simultaneously via core net of future generation.

In figure 3, long term evolution base station LTE eNB are as master base station (being referred to as LTE MeNB), i.e., chain of command is connected to LTE Carried out between eNB and core net (being referred to as EPC).GNB is as prothetic group station.User face data stream is by gNB and LTE eNB via EPC Transmission.Specifically, four kinds of user plane data transfer modes be present：Mode c1, user face data transmit between LTE eNB and EPC, And the resource provided using LTE eNB (corresponding Deta bearer is referred to as LTE-NR MCG carryings)；Mode c2, user face data exist Transmitted between gNB and EPC, and the resource transmission provided using gNB (corresponding Deta bearer is referred to as LTE-NR SCG carryings)；Mode C3, user face data transmit between LTE eNB and EPC, and a part of data utilize LTE eNB radio resource transfer, another Portion's data are sent to/from gNB by the interface between gNB and LTE eNB and utilize gNB radio resource transfer (corresponding data Carrying is referred to as LTE-NR MCG separation carrying).Mode c4, user face data transmit between gNB and EPC, and partial data is directly sharp With gNB radio resource transfer, another data are sent to/from LTE eNB by the interface between gNB and LTE eNB and utilized LTE eNB radio resource transfer (corresponding Deta bearer is referred to as LTE-NR SCG separation carrying).In mode c3 and c4, user The resource transmission that face data are provided using gNB and LTE eNB simultaneously via EPC.

In Fig. 4, eLTE eNB are connected to eLTE eNB with as master base station (being referred to as eLTE MeNB), i.e. chain of command Carried out between generation core net.GNB is as prothetic group station.User face data stream is by gNB and eLTE eNB via core net of future generation Transmission.Specifically, four kinds of user plane data transfer modes be present：Mode d1, user face data is in eLTE eNB and core of future generation The resource transmitted between heart net and provided using eLTE eNB (corresponding Deta bearer is referred to as eLTE-NR MCG carryings)；Mode d2, (corresponding Deta bearer is referred to as the resource that user face data is transmitted between gNB and core net of future generation and utilization gNB is provided ELTE-NR SCG are carried)；Mode d3, user face data transmit between eLTE eNB and core net of future generation, and a part of data Using eLTE eNB radio resource transfer, another data are sent to/from gNB simultaneously by the interface between gNB and eLTE eNB Utilize gNB radio resource transfer (corresponding Deta bearer is referred to as eLTE-NR MCG separation carrying).Mode d4, user plane number According to being transmitted between gNB and core net of future generation, and a part of data directly utilize gNB radio resource transfer, another data ELTE eNB are sent to/from by the interface between gNB and eLTE eNB and utilize eLTE eNB radio resource transfer (corresponding Deta bearer is referred to as eLTE-NR SCG separation carrying).In mode d3 and d4, user face data is same via core net of future generation The resource transmission that Shi Liyong gNB and eLTE eNB are provided.

In user plane data transfer mode a4, b4, c4, d4 of above-mentioned dual link deployment scenario, user face data is auxiliary Transmitted between base station and core net or core net of future generation, a part of data are transmitted using the Radio Resource at prothetic group station, another Partial data is sent to/from master base station by the interface between prothetic group station and master base station and is transmitted using the resource of master base station. If needing progress Deta bearer to reconfigure when carrying out downlink data transmission using the mode, such as SCG is separated and carried (can be LTE-NR or eLTE-NR or NR-LTE or NR-eLTE or LTE-eLTE or eLTE-LTE SCG separation carrying) matches somebody with somebody again It is set to MCG carryings (LTE-NR or eLTE-NR or NR-LTE or NR-eLTE or LTE-eLTE or eLTE-LTE MCG carrying).Can The forwarding that can need to configure progress data according to carrying operates, and the data forwarding operation can use data forwarding during switching Flow.Because partial data has been transmitted to master base station before reconfiguring SCG separation and being carried as MCG carryings.Therefore, how to avoid Prothetic group station forwards those to be successfully sent to master base station but user equipment (UE) not yet confirms that it is desirable to receive successful data Solve the problems, such as.

Technical scheme is made that for this.

Some embodiments of the present invention provide a kind of method for being used to forward data to master base station performed from prothetic group station, Prothetic group station and master base station cooperate with to user equipment and send data, such as are disposed by the dual link shown in Fig. 1 to Fig. 4 to cooperate with hair Send data.As shown in fig. 6, this method includes：Step 610, downlink data transmission status frames are received from master base station；Step 620, root The data that sent according to the downlink data transmission status frames received to master base station forwarding to user equipment.Wherein, downlink data Transmission state frame is used to inform that master base station has had correctly received or the data that do not receive and/or successfully turned to prothetic group station Issue the data of user equipment.

In some instances, downlink data transmission status frames can include at least one of following：

(a) receive from the prothetic group station and the maximum sequence for the user data for being sequentially sent to the user equipment that succeeds Row number；

(b) the expectation buffer size of corresponding RAB；

(c) it is directed to the minimum expectation buffer size of the user equipment；

(d) data that master base station is thought to lose and is not included in into the downlink data transmission status frames of prothetic group station transmission Bag；And

(e) to current downlink data transmission state frame whether be last downlink data transmission status frames instruction.

Deciding not to using down user data transmitting procedure or do not using the resource progress downlink data of master base station When transmission or prothetic group station are changed into another prothetic group station from a prothetic group station, if depend on preparatory condition including content (d).It is described pre- If condition can be realized by MeNB and determined.

In some instances, if current downlink data transmission state frame is last downstream state report, under described Row data transmission state frame can also include it is described d).

In some instances, preparatory condition is whether the security information at the security information and prothetic group station reconfigured is identical. In this case, in the security information reconfigured and the security information difference at prothetic group station, in downlink data transmission status frames Content (d) can not be included.In contrast, it is descending when the security information reconfigured is identical with the security information at prothetic group station Content (d) can be included in data transmission state frame.

In some instances, preparatory condition is whether the disposal ability of master base station is enough to handle from prothetic group station or one The user data that prothetic group station receives.It is inadequate in dealing with connecing from prothetic group station or one prothetic group station in the disposal ability of master base station During the user data received, content (d) can not be included in downlink data transmission status frames.In contrast, at the place of master base station When reason ability is enough to handle the user data received from prothetic group station or one prothetic group station, in downlink data transmission status frames Including content (d).

In some instances, to be sent out according to the downlink data transmission status frames received to master base station forwarding to user equipment The data sent include：When the Cooperative Mode of prothetic group station and master base station changes into main plot group carrying from the separation carrying of assisted cell group When, or when the Cooperative Mode of prothetic group station and master base station is reconfigured as another assisted cell group from an assisted cell group separation carrying During separation carrying, all sequences number are forwarded not to master base station when content d) is included in the downlink data transmission status frames received The down user data for confirming to be properly received by user equipment, wherein do not include the user data for being sent to master base station, with And when not including content d) in the downlink data transmission status frames received, all sequences number are forwarded not by user to master base station Equipment confirms the down user data being properly received, wherein including the user data for being sent to master base station.

A kind of prothetic group station is additionally provided according to some embodiments of the present invention.Prothetic group station is used to forward data to master base station. As shown in fig. 7, prothetic group station includes：Receiving unit 710, for receiving downlink data transmission status frames from master base station；And forwarding Unit 720, for forwarding the data to be sent to user equipment to master base station according to the downlink data transmission status frames received, Wherein, downlink data transmission status frames are used to inform data that master base station had correctly received or do not received to prothetic group station And/or successfully it is transmitted to the data of user equipment.

In some instances, downlink data transmission status frames include at least one of following：

(b) the expectation buffer size of corresponding RAB；

In some instances, retransmission unit 720 is additionally operable to：When the Cooperative Mode of prothetic group station and master base station is from assisted cell group When main plot group carrying is changed into separation carrying, or when the Cooperative Mode of prothetic group station and master base station separates from an assisted cell group Carrying reconfigure for another assisted cell group separate carry when, content d) is included in the downlink data transmission status frames received When to master base station forward all sequences number not confirm the down user data that is properly received by user equipment, wherein not comprising by When being sent to the user data of master base station, and not including in the downlink data transmission status frames received content d), to master Forwarding all sequences number in base station are not confirmed the down user data being properly received by user equipment, and master has been sent to wherein including The user data of base station.

In addition, prothetic group station is additionally may included in other units/modules not shown in Fig. 7, such as Operation ＆ Maintenance System etc., It will not be repeated here.

A kind of method performed by master base station, master base station and prothetic group station association are additionally provided according to some embodiments of the present invention User equipment in the same direction sends data, such as is disposed by the dual link shown in Fig. 1 to Fig. 4 to cooperate with transmission data.Such as Fig. 8 institutes Show, this method includes：Step 810, downlink data transmission status frames are generated, downlink data transmission status frames are used to accuse to prothetic group station Know that master base station has had correctly received or the data that do not receive and/or the data for being successfully transmitted to user equipment；Step 820, send downlink data transmission status frames to prothetic group station；And step 830, receive prothetic group station and be based on downlink data transmission state The data that frame is sent.

(b) the expectation buffer size of corresponding RAB；

(d) master base station is thought to lose and is not included in into the downlink data transmission status frames of prothetic group station transmission Packet；And

Deciding not to using down user data transmitting procedure or do not using the resource progress downlink data of master base station When transmission or prothetic group station are changed into another prothetic group station from a prothetic group station, decided whether to include content (d) according to preparatory condition.It is described Preparatory condition can be realized by MeNB and determined.

In some instances, preparatory condition is whether the security information at the security information and prothetic group station reconfigured is identical. In this case, in the security information reconfigured and the security information difference at prothetic group station, content (d) is not included in descending In data transmission state frame.In contrast, when the security information reconfigured is identical with the security information at prothetic group station, by content (d) include stating in downlink data transmission status frames.

In some instances, preparatory condition is whether the disposal ability of master base station is enough to handle from prothetic group station or one The user data that prothetic group station receives.It is inadequate in dealing with connecing from prothetic group station or one prothetic group station in the disposal ability of master base station During the user data received, content (d) is not included in downlink data transmission status frames.In contrast, at the place of master base station When reason ability is enough to handle the user data received from prothetic group station or one prothetic group station, content (d) is included in descending In data transmission state frame.

In some instances, when content d) is included in last downlink data transmission status frames, master base station can be according to new PDCP (PDCP) configuration information encapsulation from prothetic group station receive user data, and by its to user equipment send out Send.And in other examples, when content d) is included in last downlink data transmission status frames, master base station is to another prothetic group Transmission stand from the user data of prothetic group station reception, to be sent it to user equipment from another prothetic group station.

A kind of master base station is additionally provided according to some embodiments of the present invention.Master base station and prothetic group station are cooperateed with to user equipment Send data.As shown in figure 9, master base station includes：State instruction generation unit 910, for generating downlink data transmission status frames, Downlink data transmission status frames are used to inform that master base station has had correctly received or the data that do not receive and/or to prothetic group station Through the data for being successfully transmitted to user equipment；Transmitting element 920, for sending downlink data transmission status frames to prothetic group station；With And receiving unit 930, the data sent for receiving prothetic group station based on downlink data transmission status frames.

(b) the expectation buffer size of corresponding RAB；

Decide not to using down user data transmitting procedure or do not use the master base station resource carry out it is descending When data transfer or the prothetic group station are changed into another prothetic group station from a prothetic group station, the state instruction generation unit is according to default Whether conditional decision includes content (d).The preparatory condition can be realized by MeNB and determined.

In some instances, preparatory condition is whether the security information at the security information and prothetic group station reconfigured is identical. In this case, in the security information reconfigured and the security information difference at prothetic group station, state instruction generation unit 910 is not Content (d) is included in downlink data transmission status frames.In contrast, in the security information reconfigured and the peace at prothetic group station When full information is identical, content (d) is included in downlink data transmission status frames by state instruction generation unit 910.

In some instances, preparatory condition is whether the disposal ability of master base station is enough to handle from prothetic group station or one The user data that prothetic group station receives.It is inadequate in dealing with connecing from prothetic group station or one prothetic group station in the disposal ability of master base station During the user data received, content (d) is not included in downlink data transmission status frames by state instruction generation unit 910.With On the contrary, when the disposal ability of master base station is enough to handle the user data received from prothetic group station or one prothetic group station, Content (d) is included in downlink data transmission status frames by state instruction generation unit 910.

In some instances, transmitting element 920 can be additionally used in：Content is included in last downlink data transmission status frames When d), the user data that is received according to new PDCP configuration information encapsulation from prothetic group station, and by it to user Equipment is sent, or when include in last downlink data transmission status frames content d), to the transmission of another prothetic group station from described auxiliary The user data that base station receives, to be sent it to user equipment from another prothetic group station.

Master base station can also include memory cell 940, and its behaviour is being performed for storing unit/module in master base station Data caused by work or required data.

In addition, master base station is additionally may included in other units/modules not shown in Fig. 9, such as Operation ＆ Maintenance System etc., It will not be repeated here.

It should be noted that, although show prothetic group according to embodiments of the present invention in modular form in figures 7 and 9 Stand and the exemplary reduced block diagram of master base station, heretofore described method can also be in processing equipment (for example, central processing unit Unit (CPU) or other any suitable processing equipments) in perform.For example, it can store in memory for performing the present invention The programmed instruction of methods described, and these programmed instruction are performed by processing equipment.

Fig. 5 shows the entity of radio protocol layer 2 being related in LTE dual link deployment way, includes PDCP entities, radio chains Road controls RLC entities and media access control MAC entity.Interface between MeNB and SeNB is designated as X2, chain of command data and user Face data can be transmitted or transmitted on different interfaces on same interface.PDCP entities provide function include be from EPC data distribution sequence number SN, head compression ROHC, integrity protection (only chain of command), encryption, increase PDCP heads, route.Need It is noted that the institute that not all carrying is required for PDCP entities to provide is functional.For example, signaling bear does not need road The separation carrying in integrity protection, dual link deployment is not needed to enter wardrobe compression etc. by, Deta bearer.RLC entities The function of offer includes：Transmit data buffer storage, segmentation/cascade, re-transmission, increase PDU etc..According to the RLC patterns configured Difference, the function that RLC entities provide are also different.Such as RLC Unacknowledged Modes (RLC UM) do not have functions of retransmission, and RLC confirms Pattern (RLC AM) has functions of retransmission.The function that MAC entity provides includes：Multiplex/demultiplex, priority of logical channels are (only For up), Stochastic accessing, HARQ etc..It should be noted that in dual link, UE can include two MAC, one and MCG Corresponding, another is corresponding with SCG.

In NR and/or eLTE communication systems, radio protocol layer is also required to PDCP entities, RLC entities, MAC entity and provided All or part of function, it is also possible to do not provide other functions, such as light beam comprising PDCP entities, RLC entities, MAC entity (Bean) management function.The combination and layered mode of function may also be different from LTE, for example, in NR, can integrate The reordering function of PDCP entities and RLC entities, only provided in an entity, such as the work(that reorders is provided only in PDCP Energy.For convenience, current invention assumes that the radio protocol layer 2 of NR and/or eLTE communication systems also includes PDCP, RLC, MAC. It should be noted that the combination for the function of being provided the invention is not restricted to described PDCP entities, RLC entities, MAC entity And layered mode.

In mixing dual link deployment mode (master base station and prothetic group station be different types of base station), LTE PDCP entities, RLC entities, MAC entity are respectively labeled as LTE PDCP entities, LTE RLC entities, LTE MAC entities；ELTE PDCP entities, RLC entities, MAC entity are respectively labeled as eLTE PDCP entities, eLTE RLC entities, eLTE MAC entities；NR PDCP is real Body, RLC entities, MAC entity are respectively labeled as NR PDCP entities, NR RLC entities, NR MAC entities；Distinguished with showing.Each If not explicitly pointing out PDCP entities, RLC entities, MAC entity specifically corresponding entity type in embodiment, i.e., without clear and definite Instruction PDCP entities, RLC entities, MAC entity correspond to which class entity in LTE, eLTE, NR, then according to the MeNB of dual link with SeNB type can be inferred that corresponding PDCP entities, RLC entities, MAC entity type.

It is described below the embodiment that downlink data transmission status frames are sent between MeNB and SeNB

In existing LTE dual links (master base station and prothetic group station be LTE eNB), downlink data transmission state (Downlink Data Delivery Status) process is used for SeNB and provides feedback to MeNB so that MeNB controls each E- RAB (enhanced wireless access bearer) flows through SeNB down user data stream.

When SeNB determines to trigger the feedback to downlink data transmission process, the feedback (is referred to as downlink data transmission shape State frame) include herein below：

1. (PDCP PDU are most for the maximum sequence number of the user data for being sequentially sent to UE that succeeds received from MeNB Big sequence number)；

2. corresponding E-RAB expectation buffer size (in terms of byte)；

3. for corresponding UE minimum expectation buffer size (in terms of byte)；

4.SeNB think lose and be not included in report to the X2-U data in MeNB downlink data transmission status frames Bag.

If E-UTRAN deployment decides not to use down user data transmitting procedure, SeNB is sent under MeNB Row data transmission state frame do not include it is described d).The down user data transmits (Transfer of Downlink User Data) process is used in the interface (being designated as X2-U) by being used to transmit data between MeNB and SeNB from MeNB transmission containing descending X2-U specific sequence number informations are provided when PDCP PDU packet is to SeNB.

In the dual link deployment of NR, LTE, eLTE any two combination, separate and carry for such as SCG, downlink data Transmission state process can be used for MeNB and provide feedback to SeNB so that each carrying (such as E-RAB) of SeNB controls flows through MeNB down user data stream.It should be noted that, although this illustrates technical side of the invention exemplified by sentencing SCG separation carryings Case, but technical scheme can also be applied to any of between such as MeNB and SeNB transmitting user data Dual link is disposed.

When MeNB determines to provide the feedback (the feedback referred to as downlink data transmission shape of downlink data transmission process to SeNB State frame) when, the feedback can include following one or more：

A) from maximum sequence number (such as the PDCP PDU of the SeNB user data for being sequentially sent to UE that succeeds received Maximum sequence number)；

B) corresponding E-RAB expectation buffer size (in terms of byte)；

C) for corresponding UE minimum expectation buffer size (in terms of byte)；

D) MeNB think lose and be not included in report to the Xr-U data in SeNB downlink data transmission status frames Bag.

E) whether it is that last downstream state reports (downlink data transmission state to current downlink data transmission state frame Frame) instruction.

In one embodiment, if NR (or being NR-UTRAN) or E-UTRAN deployment decides not to use descending use During user data transmitting procedure (or SeNB decides not to carry out downlink data transmission using MeNB resource, such as change or discharge During SeNB), MeNB be sent to SeNB downlink data transmission status frames can include it is described d).MeNB can be according to preparatory condition Decide whether in downlink data transmission status frames comprising it is described d).The preparatory condition can be realized by MeNB and determined.For example, Whether the security information that MeNB determinations reconfigure is identical with the security information that SeNB is configured, if identical, in lower line number According in transmission state frame comprising it is described d).If it is different, then in downlink data transmission status frames do not include it is described d).Or MeNB according to its ability, decide whether in downlink data transmission status frames comprising it is described d)；When MeNB determine can handle from During the PDCP PDU that SeNB is received, downlink data state procedure include it is described d)；When MeNB determine cannot handle from During the PDCP PDU that SeNB is received, in downlink data transmission status frames do not include it is described d).MeNB can according to its ability, Decide whether in downlink data transmission status frames comprising it is described d).The down user data transmitting procedure is used to pass through Be used to transmitting between MeNB and SeNB the interfaces (being designated as Xr-U) of data from SeNB user data of the transmission containing descending PDCP PDU to Xr-U specific sequence number informations are provided during MeNB.The specific sequence numbers of Xr-U are the sequence numbers distributed by corresponding eNB.

In another embodiment, when current downlink data transmission state frame is last downstream state report, now institute State downlink data transmission status frames can include it is described d).

In another embodiment, carried if a SCG separation carrying (SeNB) is reconfigured to separate for another SCG (SeNB) when, MeNB is sent in source SeNB (that is, the SeNB before change) downlink data transmission status frames can be comprising described d).MeNB according to preparatory condition decide whether in downlink data transmission status frames comprising it is described d).The preparatory condition can be with Realized and determined by MeNB.For example, MeNB determines the security information the phase whether security information reconfigured is configured with source SeNB Together, it is if identical, in downlink data transmission status frames comprising it is described d).If it is different, then in downlink data transmission state In frame do not include it is described d).Or MeNB is according to its ability, decide whether in downlink data transmission status frames comprising it is described d)； When MeNB determines to handle from the PDCP PDU that source SeNB is received, comprising described in downlink data transmission status frames d)；When MeNB determines to handle from the PDCP PDU that source SeNB is received, do not wrapped in downlink data transmission status frames Containing it is described d).MeNB can according to its ability, decide whether in downlink data transmission status frames comprising it is described d).

In another embodiment, if by SCG separation carrying reconfigure carried for MCG when, MeNB is sent to SeNB's In downlink data transmission status frames can include it is described d).Whether MeNB can be according to predefined conditional decision in downlink data In transmission state frame comprising it is described d).For example, MeNB determine the security information that reconfigures whether the peace configured with source SeNB Full information is identical, if identical, in downlink data transmission status frames comprising it is described d).If it is different, then in downlink data In transmission state frame do not include it is described d).Or MeNB decides whether to wrap in downlink data transmission status frames according to its ability Containing it is described d)；When MeNB determines to handle from the PDCP PDU that source SeNB is received, in downlink data transmission status frames Comprising it is described d)；When MeNB determines to handle from the PDCP PDU that source SeNB is received, in downlink data transmission state In frame do not include it is described d).MeNB can according to its ability, decide whether in downlink data transmission status frames comprising it is described d).

It should be noted that in the present invention, 1)~5 the content included in downlink data transmission status frames is not limited to) The content of definition, it is also possible to include other guide.Its act on comprise at least MeNB to SeNB provide feedback, with inform SeNB its It is properly received or the data that do not receive and/or the data (i.e. the data that UE has been properly received) for being successfully transmitted to UE.

SeNB is described below forwards DATA Example to MeNB

In dual link deployment scenario, when SCG separation carrying reconfigure for MCG carrying and/or SCG carrying reconfigure for MCG is carried and/or MCG carryings reconfigure and reconfigure for SCG carryings and/or MCG carryings and carry/reconfigure SCG points for SCG separation During from carrying (reconfigure a SCG carrying and carried for another SCG) etc., it may be necessary to carry out data forwarding.Lead to below Cross and reconfigure some carryings as example to carry out the elaboration of technical solution of the present invention, it will be appreciated, however, that of the invention Available for other any situations for needing the forwarding data between different base station.The data forwarding process can use switching flow Defined in data forwarding flow.Source eNB (source eNB) defined in the eNB of forwarding data behavior and switching flow is OK To be identical；Receive the eNB of forwarding data behavior and target eNB (target eNB) behavior phase defined in switching flow Together.

In one embodiment, it is SCG separation carrying and/or MCG separation carrying configuration RLC affirmation modes (RLC AM), Configure rlc layer and reliable data transfer (data receiver provides feedback for data sending terminal) is provided.

In one embodiment, NR or E-UTEAN is configured to UE configurations ROHC (or configuration is reordered timer t- Reordering), but not comprising separation carrying (such as MCG separation carrying, SCG separation carrying) and will separation carrying reconfigure for MCG is carried.The master base station of the separation carrying and prothetic group station can be gNB, LTE eNB, eLTE eNB.The timing of reordering Device is used to detect whether PDCP PDU lose.

In one embodiment, by SCG separation carrying reconfigure carried for MCG when, SeNB is not confirmed all SN by UE The descending PDCP SDU being properly received are transmitted to MeNB and (may also contain in the data of the forwarding from core net or the next generation The data for not yet distributing PDCP SN of core net), but the data for having transmitted to MeNB are not forwarded.It is described to have transmitted to MeNB data can be confirmed to be properly received by MeNB but the data being properly received not yet are confirmed by UE.For example, inciting somebody to action SCG separation carryings are reconfigured when being carried for MCG, and MeNB reports that it has successfully connect in downlink data transmission status frames to SeNB The data of receipts or the data of loss.SeNB can succeed according to whether the downlink data transmission status frames from MeNB include The reports of the data of reception or the data of loss determines the need for the data that forwarding has transmitted to MeNB.If come from MeNB downlink data transmission status frames do not include the data or loss for being successfully received but not yet being confirmed by UE and be properly received Data report, then SeNB forwardings have transmitted to MeNB data.If the downlink data transmission status frames from MeNB The report of the data for the data or loss being properly received comprising the data being successfully received but is not yet confirmed by UE, then SeNB is not The data that forwarding MeNB has been properly received.For example, if the downlink data transmission status frames from MeNB include d), SeNB is not The data that forwarding MeNB has been properly received.If the downlink data transmission status frames from MeNB do not include d), SeNB forwardings The data that MeNB has been properly received.Or by SCG separation carrying reconfigure carried for MCG when, MeNB can be for example, by one Whether sign instruction SeNB needs to forward the data for having transmitted to MeNB.Certainly, other indicating modes can also apply this The embodiment of invention.

In another embodiment, (SCG is separated into carrying and is configured to another SCG reconfiguring SCG separation carrying Separation carrying, i.e., MeNB is constant, and SeNB changes) when, all SN are not properly received descending by source SeNB by UE confirmations PDCP SDU are transmitted to MeNB and (not yet dividing from core net or core net of future generation are may also contain in the data of the forwarding Data with PDCP SN), but the data for having transmitted to MeNB are not forwarded.The data for having transmitted to MeNB can be Confirm to be properly received by MeNB but the data being properly received not yet are confirmed by UE.For example, reconfigured by SCG separation carryings When being carried for MCG, MeNB reports its data or loss for being successfully received in downlink data transmission status frames to source SeNB Data.Source SeNB can according to the downlink data transmission status frames from MeNB whether comprising the data that are successfully received or The data of loss are reported to determine the need for the data that forwarding has transmitted to MeNB.If the downlink data from MeNB Transmission state frame does not include the report for being successfully received but the data for the data or loss being properly received not yet being confirmed by UE, then Source SeNB forwards the data for having transmitted to MeNB.If the downlink data transmission status frames from MeNB are included and successfully connect The data of receipts but the report that the data of the data that are properly received or loss are not yet confirmed by UE, then source SeNB do not forward MeNB into The data that work(receives.For example, if the downlink data transmission status frames from MeNB include d), source SeNB has not forwarded MeNB The data being properly received.If the downlink data transmission status frames from MeNB do not include d), source SeNB forwarding MeNB into The data that work(receives.Or by SCG separation carrying reconfigure carried for MCG when, MeNB can be for example, by a sign Indicate the data whether SeNB needs forwarding to have transmitted to MeNB.Certainly, other indicating modes can also apply the reality of the present invention Apply example.

In another embodiment, by MCG carrying reconfigure for SCG separate carry when, be stored in MeNB buffer areas Not yet confirm that SeNB can not be transmitted to by receiving successful data (including PDCP SDU and/or PDCP PDU) by UE.

MeNB is described below to what is locally preserved, is not yet confirmed to receive the processing procedure of successful data by UE.

In one embodiment, if MeNB last downlink data transmission status frames include it is described d), MeNB will Received from SeNB user data (preserved in buffer area be not yet sent to UE and/or not yet by UE confirm receive successfully Data) carry out conventional data processing, and be sent to user equipment after being packaged by new PDCP configuration informations.

In another embodiment, if MeNB last downlink data transmission status frames include it is described d), MeNB By the user data received from SeNB (preserved in buffer area be not yet sent to UE and/or not yet by UE confirm receive into The data of work() it is transmitted to another SeNB and sign is carried in the packet of forwarding, the sign is used to inform this PDCP SDU or the PDCP PDU of another SeNB current datas.Another SeNB can be direct by the PDCP PDU from MeNB It is transmitted to after UE or processing and is sent to UE after being packaged by new PDCP configuration informations.

The embodiment for the security information that MeNB processing SeNB is UE configurations is described below

In one embodiment, when MeNB receives the security information that SeNB is UE configurations, the SeNB is locally being preserved For the security information of UE configurations.

In another embodiment, by SCG separation carrying reconfigure for MCG carry and/or reconfigure SCG carrying and/or MCG carrying reconfigure for SCG separate carry when, SeNB to MeNB send SeNB be UE configuration security information.It is for example, described SeNB is that the security information of UE configurations is carried in SN states transfer (SN StatusTransfer) message or other message or new fixed In the message of justice.

It should be noted that the present invention does not particularly point out master base station and auxiliary base station type when describing above-described embodiment. It can be LTE eNB and/or eLTE eNB and/or gNB that the present invention, which is applied to master base station, prothetic group station can for LTE eNB and/or ELTE eNB and/or gNB any two combine deployment scenario, are also applied for other dual link deployment scenarios, such as 6G.Not In same communication system, the term of use may be different, but above-mentioned flow stands good.

It can be by controlling CPU (CPU) to make calculating to operate according to the program in the equipment of the present invention Machine realizes the program of embodiments of the invention function.The program or the information handled by the program can be temporarily stored in volatibility Memory (such as random access memory ram), hard disk drive (HDD), nonvolatile memory (such as flash memory) or its In his accumulator system.

For realizing that the program of various embodiments of the present invention function can record on a computer readable recording medium.It can lead to Crossing makes computer system read the program being recorded in the recording medium and performs these programs to realize corresponding function.This So-called " computer system " at place can be built-in the computer system in the equipment, can include operating system or hardware (such as ancillary equipment)." computer readable recording medium storing program for performing " can be semiconductor recording medium, optical record medium, magnetic recording Jie Matter, the in short-term recording medium of dynamic memory program or any other computer-readable recording medium.

Can be by circuit (for example, monolithic or more with the various features or functional module of equipment in the above-described embodiments Piece integrated circuit) realize or perform.The circuit for the function being designed to carry out described by this specification can include general place Reason device, digital signal processor (DSP), application specific integrated circuit (ASIC), field programmable gate array (FPGA) or other can compile Any combination of journey logical device, discrete door or transistor logic, discrete nextport hardware component NextPort or above-mentioned device.General procedure Device can be microprocessor or any existing processor, controller, microcontroller or state machine.Foregoing circuit can To be digital circuit or analog circuit.Occur the new of the existing integrated circuit of replacement because of the progress of semiconductor technology Integrated circuit technique in the case of, one or more embodiments of the invention can also use these new integrated circuit techniques To realize.

In addition, the invention is not limited in above-described embodiment.Although it have been described that the various examples of the embodiment, but The invention is not limited in this.Fixation or non-mobile electronic equipment installed in indoor or outdoors may be used as terminal device or logical Equipment is believed, such as AV equipment, cooking apparatus, cleaning equipment, air-conditioning, office equipment, automatic vending machine and other household electrical appliance Deng.

As above, embodiments of the invention are described in detail by reference to accompanying drawing.But specific structure not office It is limited to above-described embodiment, the present invention also includes changing without departing from any design of present subject matter.Furthermore it is possible in claim In the range of the present invention is variously changed, by obtained by the technological means that is combined as disclosed in different embodiments Embodiment is also included in the technical scope of the present invention.In addition, the component with same effect described in above-described embodiment It can be substituted for each other.

Claims

1. a kind of method for being used to forward data to master base station performed from prothetic group station, the prothetic group station and master base station collaboration Data are sent to user equipment, methods described includes：

Downlink data transmission status frames are received from the master base station；And

The data that sent according to the downlink data transmission status frames received to master base station forwarding to the user equipment,

Wherein, the downlink data transmission status frames be used for the prothetic group station inform the master base station had correctly received or The data that do not receive and/or the data for being successfully transmitted to the user equipment.

2. according to the method for claim 1, wherein, the downlink data transmission status frames include at least one of following：

(a) receive from the prothetic group station and the maximal sequence for the user data for being sequentially sent to the user equipment that succeeds Number；

(b) the expectation buffer size of corresponding RAB；

(d) number that the master base station is thought to lose and is not included in into the downlink data transmission status frames of prothetic group station transmission According to bag；And

3. the method according to claim 11, wherein, when sending last downlink data transmission status frames, including content (d)。

4. according to the method for claim 2, wherein, deciding not to using down user data transmitting procedure or no longer making When carrying out downlink data transmission or the prothetic group station with the resource of the master base station and being changed into another prothetic group station from a prothetic group station, it is It is no to depend on preparatory condition including content (d).

5. method according to any one of claim 1 to 4, wherein, the preparatory condition is the safety letter reconfigured Whether breath is identical with the security information at the prothetic group station；

In the security information reconfigured and the security information difference at the prothetic group station, in the downlink data transmission status frames Do not include content (d)；And

When the security information reconfigured is identical with the security information at the prothetic group station, in the downlink data transmission status frames Including content (d).

6. method according to any one of claim 1 to 4, wherein, the preparatory condition is the processing of the master base station Whether ability is enough to handle the user data received from the prothetic group station or one prothetic group station；

In the user that the disposal ability of the master base station is inadequate in dealing with receiving from the prothetic group station or one prothetic group station During data, content (d) is not included in the downlink data transmission status frames；And

It is enough to handle the number of users received from the prothetic group station or one prothetic group station in the disposal ability of the master base station According to when, the downlink data transmission status frames include content (d).

7. method according to any one of claim 1 to 4, wherein, according to the downlink data transmission status frames received The data that sent to master base station forwarding to user equipment include：

When the Cooperative Mode of the prothetic group station and the master base station changes into main plot group carrying from the separation carrying of assisted cell group When, or when the Cooperative Mode of the prothetic group station and the master base station is reconfigured to be another auxiliary from an assisted cell group separation carrying When helping the separation carrying of cell group：

When content d) is included in the downlink data transmission status frames received, to the master base station forward all sequences number not by User equipment confirms the down user data being properly received, wherein do not include the user data for being sent to the master base station, And

When not including content d) in the downlink data transmission status frames received, all sequences number are forwarded not to the master base station The down user data for confirming to be properly received by user equipment, wherein including the user data for being sent to the master base station.

8. a kind of prothetic group station, for forwarding data to master base station, the prothetic group station includes：

Receiving unit, for receiving downlink data transmission status frames from the master base station；

Retransmission unit, for be set according to the downlink data transmission status frames received to master base station forwarding to the user The data that preparation is sent, and

9. prothetic group station according to claim 8, wherein, the downlink data transmission status frames include at least one of following：

(b) the expectation buffer size of corresponding RAB；

10. prothetic group station according to claim 9, wherein, when sending last downlink data transmission status frames, including it is interior Hold (d).

11. prothetic group station according to claim 9, wherein, deciding not to using down user data transmitting procedure or not The resource progress downlink data transmission or the prothetic group station for reusing the master base station are changed into another prothetic group station from a prothetic group station When, if depend on preparatory condition including content (d).

12. the prothetic group station according to any one of claim 8 to 11, wherein, the preparatory condition is the peace reconfigured Whether full information is identical with the security information at the prothetic group station；

13. the prothetic group station according to any one of claim 8 to 11, wherein, the preparatory condition is the master base station Whether disposal ability is enough to handle the user data received from the prothetic group station or one prothetic group station；

14. the prothetic group station according to any one of claim 8 to 11, wherein, the retransmission unit is additionally operable to：

15. a kind of method performed by master base station, master base station and the prothetic group station cooperate with to user equipment and send data, the side Method includes：

Downlink data transmission status frames are generated, the downlink data transmission status frames are used to inform the main base to the prothetic group station The data for having had correctly received or not received of standing and/or the data for being successfully transmitted to the user equipment；

The downlink data transmission status frames are sent to the prothetic group station；And

Receive the data that the prothetic group station is sent based on the downlink data transmission status frames.

16. according to the method for claim 15, wherein, the downlink data transmission status frames include at least one of following：

(b) the expectation buffer size of corresponding RAB；

17. the method according to claim 11, wherein, when sending last downlink data transmission status frames, including it is interior Hold (d).

18. according to the method for claim 16, wherein, deciding not to use down user data transmitting procedure or no longer When being changed into another prothetic group station from a prothetic group station using the resource progress downlink data transmission of the master base station or the prothetic group station, Decided whether to include content (d) according to preparatory condition.

19. the method according to any one of claim 15 to 18, wherein, the preparatory condition is the safety reconfigured Whether information is identical with the security information at the prothetic group station；

In the security information that reconfigures and the security information difference at the prothetic group station, not by content (d) be included in it is described under In row data transmission state frame；And

When the security information reconfigured is identical with the security information at the prothetic group station, content (d) is included in described descending In data transmission state frame.

20. the method according to any one of claim 15 to 18, wherein, the preparatory condition is the place of the master base station Whether reason ability is enough to handle the user data received from the prothetic group station or one prothetic group station；

It is enough to handle the number of users received from the prothetic group station or one prothetic group station in the disposal ability of the master base station According to when, content (d) is included in the downlink data transmission status frames.

21. the method according to any one of claim 15 to 18, in addition to：

When content d) is included in the last downlink data transmission status frames, configured according to new PDCP The user data that Information encapsulation receives from the prothetic group station, and it is sent to the user equipment, or

When content d) is included in the last downlink data transmission status frames, sent to another prothetic group station from the prothetic group station The user data of reception, to be sent it to the user equipment from another prothetic group station.

22. a kind of master base station, master base station and the prothetic group station cooperates with to user equipment and sends data, and the master base station includes：

State instruction generation unit, for generating downlink data transmission status frames, the downlink data transmission status frames be used for Inform that the master base station has had correctly received or the data that do not receive and/or has successfully been transmitted to described in the prothetic group station The data of user equipment；

Transmitting element, for sending the downlink data transmission status frames to the prothetic group station；And

Receiving unit, the data sent for receiving the prothetic group station based on the downlink data transmission status frames.

23. master base station according to claim 22, wherein, the downlink data transmission status frames include following at least one ：

(b) the expectation buffer size of corresponding RAB；

(e) to current downlink data transmission state frame whether be the finger of last downlink data transmission status frames not.

24. prothetic group station according to claim 23, wherein, when sending last downlink data transmission status frames, including Content (d).

25. master base station according to claim 23, wherein, deciding not to using down user data transmitting procedure or not The resource progress downlink data transmission or the prothetic group station for reusing the master base station are changed into another prothetic group station from a prothetic group station When, the state instruction generation unit decides whether to include content (d) according to preparatory condition.

26. the master base station according to any one of claim 22 to 25, wherein, the preparatory condition is the peace reconfigured Whether full information is identical with the security information at the prothetic group station；

In the security information reconfigured and the security information difference at the prothetic group station, the state instruction generation unit will not Content (d) is included in the downlink data transmission status frames；And

When the security information reconfigured is identical with the security information at the prothetic group station, the state instruction generation unit is by Hold (d) to be included in the downlink data transmission status frames.

27. the master base station according to any one of claim 22 to 25, wherein, the preparatory condition is the master base station Whether disposal ability is enough to handle the user data received from the prothetic group station or one prothetic group station；

In the user that the disposal ability of the master base station is inadequate in dealing with receiving from the prothetic group station or one prothetic group station During data, content (d) is not included in the downlink data transmission status frames by the state instruction generation unit；And

It is enough to handle the number of users received from the prothetic group station or one prothetic group station in the disposal ability of the master base station According to when, content (d) is included in the downlink data transmission status frames by the state instruction generation unit.

28. the master base station according to any one of claim 22 to 25, wherein, the transmitting element is additionally operable to：