CN104284437A

CN104284437A - Data transmission method, device and system for coordinated multiple points transmission/reception center dispatching

Info

Publication number: CN104284437A
Application number: CN201310286727.6A
Authority: CN
Inventors: 付喆; 胡海静
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2013-07-09
Filing date: 2013-07-09
Publication date: 2015-01-14
Anticipated expiration: 2033-07-09
Also published as: WO2015003614A1; CN104284437B

Abstract

The invention provides a data transmission method, device and system for coordinated multiple points transmission/reception center dispatching. User plane data to be transmitted of CoMP UE are obtained from an SGW, CSIs of all UE and the volume of the user plane data to be transmitted by non-CoMP UE are obtained from all coordinated transmission points, communication with the coordinated transmission points dispatched by a CCN is conducted, and dispatching and transmission of the user plane data of the CoMP UE are executed; the coordinated transmission points in the same coordinated set of the CCN report the CSIs of all the UE and the volume of the user plane data to be transmitted of the non-CoMP UE to the CCN under the coordinated transmission points, due to the communication with the CCN, CoMP resources are used for executing dispatching and transmission of the user plane data of the CoMP UE, and non-CoMP resources are used for executing dispatching and transmission of user plane data of the non-CoMP UE. The data transmission method, device and system for coordinated multi-point transmission/reception center dispatching can solve the problem of user data transmission and processing process when the CCN serves as the dispatching control node in a non-ideal return scene.

Description

A kind of data transmission method of cooperative multipoint transmission central dispatching and Apparatus and system

Technical field

The present invention relates to wireless communication technology field, particularly relate to a kind of data transmission method and Apparatus and system of cooperative multipoint transmission central dispatching.

Background technology

CoMP(Coordinated Multiple Points Transmission/Reception, cooperative multipoint transmission) refer to multiple TP(transmission point that geographical position is separated, transfer point), collaborative scope of participants is to transfer of data (the PDSCH(Physical Downlink Shared Channel of a terminal, physical down link sharing channel) transmission) or combine data (PUSCH(Physical Uplink Shared Channel, the physical uplink link shared channels) transmission that reception terminal sends).

In general, multiple transfer point can be the base station of different districts, also can be the multiple RRH(remote radio head in same control community, far end radio frequency).By the cooperative scheduling between multiple transfer point, precoding, joint transmission etc., effectively can reduce the interference between cooperation transmission point, improve the throughput that user in the coverage of collaboration region, particularly cooperation point cover edge customer.

Cooperative multipoint transmission technology can be divided into down collaboration multi-point and uply combine reception.

Down collaboration multi-point is mainly divided into again two kinds of transmission plans: cooperative scheduling/cooperative beam figuration (coordinated scheduling/coordinated beamforming, CS/CB) and Combined Treatment (joint processing, JP) scheme.

A transfer point in CS/CB transmission in multiple transfer point sends useful signal to user terminal, and other transfer point, by combined dispatching and wave beam forming, reduces the interference to this user terminal as far as possible.

Combined Treatment scheme can be divided into joint transmission (joint transmission, JT) and dynamic transmission point selection (dynamic point selection, DPS).In JT transmission, multiple transfer point sends useful signal to same user terminal simultaneously, thus enhances the Received signal strength of user terminal.DPS transmits the transfer point of switching at runtime user terminal, from cooperation transmission point, always select the some signal transmission to this user terminal optimum.

These cooperative multipoint transmission schemes can be combined with each other.Can also to mourn in silence (dynamic blanking, DB) scheme in conjunction with dynamic transmission point, some transfer point is dynamically set on some running time-frequency resource and not send signal.

Up CoMP versus downstream CoMP is comparatively simple, and uplink coordinated mode mainly comprises combines reception and cooperative scheduling two kinds.During associating reception, the signal of the same UE that multiple acceptance point receives is outputed signal by Combined Treatment.During cooperative scheduling, base station side considers multiple acceptance point situation scheduling UE in collaboration region, with minimise interference.

Can adopt in two ways when carrying out coordinate multipoint scheduled transmission between intra-cell transmission node: 1) non-central cooperative scheduling; 2) center cooperative scheduling.

Non-central scheduling does not have Centroid to carry out global optimization scheduling, in order to reach the result close to global optimization, may need the method adopting iteration scheduling between base station, may need to carry out repeatedly schedule information alternately, as shown in Figure 1 between cooperative base station.If backhaul time delay is comparatively large between base station, schedule information is carried out repeatedly in non-central scheduling can make scheduling delay excessive alternately, causes channel information out-of-date, thus affects transmission performance.

Under the cooperative scheduling scene of center, then the user terminal CSI(Channel State Information of all these base stations of access received recently by each cooperative base station, channel condition information) information transmission give a CCN(central coordination node, center cooperative node), by user terminal centralized dispatching time domain and frequency domain resource that CCN is all cooperative base station, associated base stations again according to CCN send resource scheduling information and pre-encoding results be user terminal transmission data, as shown in Figure 2.

In LTE/LTE-A system, the information interaction between base station is realized by back haul link (backhaul).May there is multiple backhaul physical connection mode in real network, the information exchange in CoMP cooperative scheduling between base station should consider the situation of desirable backhaul and nonideal backhaul.Usual imperfect backhaul propagation delay time may reach 10ms or larger.

Rel-12CoMP technology studies one of scene using the center cooperative scheduling scheme under imperfect back haul link as main CoMP.In imperfect backhaul situation, mainly there are the following problems for center cooperative scheduling scheme: backhaul time delay is on the impact of CoMP central dispatching.

E-UTRAN(Evolved Universal Terrestrial Radio Access Network, the general land wireless network of evolution) the network architecture as shown in Figure 3, E-UTRAN is made up of evolution base station eNB.ENB completes Access Network function, with UE(User Equipment, and user terminal) pass through idle port communication.Not only chain of command connection is there is but also there is the connection of user face between UE and eNB.Each is attached to the UE of network, by a MME(Mobility Management Entity, Mobility Management Entity) provide service for it, adopt S1-MME interface to be connected between MME and eNB.S1-MME interface is used for providing chain of command service for UE, comprises mobile management and bearer management function.

S-GW(Service Gateway, gateway) be connected with adopting S1-U interface between eNB, for each UE being attached to network, there is a S-GW to provide service for it.S1-U interface is used for providing user face to serve for UE, and the user face data of UE is carried between S-GW and eNB by S1-U and transmits.

For center cooperative scheduling scene, need the data transmission architecture considering this scene, and consider scheduled transmission problem for transmission architecture, scheduling decision to CoMP user and data transmission and processing is realized timely and accurately to help network side, reduce backhaul time delay to the impact of CoMP central dispatching, but also do not provide relevant solution at present.

Summary of the invention

The invention provides a kind of data transmission method and Apparatus and system of cooperative multipoint transmission central dispatching, realize the data transmission method of cooperative multipoint transmission center cooperative scheduling, help network side to realize scheduling decision to CoMP UE and data transmission and processing timely and accurately, reduce the impact of backhaul time delay on CoMP central dispatching.

The invention provides a kind of data transmission system of cooperative multipoint transmission central dispatching, comprising:

Gateway SGW, communicates with center cooperation point CCN, to the user face data to be transmitted of CCN cooperative transmission multicast communication user terminal CoMP UE;

CCN, the user face data to be transmitted of CoMP UE is obtained from SGW, the channel condition information CSI of all UE and the user face data amount to be transmitted of non-CoMP UE is obtained from belonging to the same all cooperation transmission points in gathering that cooperate with CCN, according to user face data amount to be transmitted and the CSI of all UE, the cooperation transmission point dispatched with CCN communicates, and performs the scheduled transmission of the user face data of CoMP UE;

The cooperate cooperation transmission point gathered same as CCN, the CSI of all UE and the user face data amount to be transmitted of non-CoMP UE under reporting described cooperation transmission point to CCN, by communicating with CCN, determine the CoMP resource that CoMPUE transfer of data uses, utilize CoMP resource to perform the user face data scheduled transmission of CoMP UE, utilize non-CoMP resource to perform the user face data scheduled transmission of non-CoMP UE.

The invention provides a kind of data transmission method of cooperative multipoint transmission central dispatching, comprising:

Center cooperative node CCN obtains the user face data to be transmitted of cooperative multipoint transmission user terminal CoMPUE from gateway SGW;

CCN obtains the channel condition information CSI of all UE and the user face data amount to be transmitted of non-CoMP UE from belonging to the same all cooperation transmission points gathered that cooperate with it;

CCN is according to the user face data amount to be transmitted of all UE and CSI, and the cooperation transmission of dispatching with CCN point communicates, and performs the scheduled transmission of the user face data of CoMP UE.

In conjunction with the first possible execution mode of said method, CCN communicates with the cooperation transmission point of its scheduling, performs the scheduled transmission of the user face data of CoMP UE, specifically comprises:

CCN, according to the user face data amount size to be transmitted of all UE and CSI, when determining that CoMP UE carries out coordinated multipoint transmission, selects the cooperation transmission point of CoMP UE, and generates schedule information and the media access control protocol data unit MAC PDU of CoMP UE;

The schedule information generated and MAC PDU are notified the cooperation transmission point of CoMP UE by CCN.

In conjunction with the first possible execution mode of said method, when the cooperation transmission point of CoMP UE does not comprise the serving BS of CoMP UE, the schedule information generated and MAC PDU are also notified the serving BS of CoMP UE by CCN.

In conjunction with the first possible execution mode of said method, for the CoMP UE carrying out coordinated multipoint transmission, when the serving BS of CoMP UE is determined to need data re-transmission according to the Negative Acknowledgement NACK feedback information of CoMP UE, determine CoMP resource according to the schedule information of CCN, and utilize current non-CoMP scheduling of resource CoMP UE data re-transmission.

In conjunction with the first possible execution mode of said method, the serving BS of CoMP UE utilizes current non-CoMP scheduling of resource CoMP UE data re-transmission, specifically comprises:

The serving BS of CoMP UE utilizes the serving BS of CCN scheduling CoMP UE to carry out the moment outside new data transmission to CoMP UE, scheduling CoMP UE data re-transmission.

CCN is when the serving BS scheduling CoMP UE data re-transmission of possible CoMP UE, and the serving BS not dispatching CoMP UE carries out new data transmission to CoMP UE; Or

CCN receives the serving BS of CoMP UE to before the ACK feedback of data retransmission, and the serving BS not dispatching CoMP UE carries out new data transmission to CoMP UE.

In conjunction with the first possible execution mode of said method, when the serving BS for the CoMP UE carrying out coordinated multipoint transmission, CoMP UE is determined to need data re-transmission according to the Negative Acknowledgement NACK feedback information of CoMP UE, to CoMP UE data retransmission;

If the serving BS of CoMP UE is to the synchronization of CoMP UE data retransmission, the serving BS that CCN dispatches CoMP UE carries out new data transmission to CoMP UE, then the ACK/NACK that the serving BS of CoMP UE receives new data and data retransmission respectively by two HARQ feeds back.

In conjunction with the execution mode that the second of said method is possible, CCN communicates with the cooperation transmission point of its scheduling, performs the scheduled transmission of the user face data of CoMP UE, specifically comprises:

CCN according to the user face data amount size to be transmitted of all UE and CSI, when determining that CoMP UE carries out non-coordinated multipoint transmission, then:

CCN generates schedule information and the media access control protocol data unit MAC PDU of CoMP UE, the schedule information of generation and MAC PDU is sent to the serving BS of CoMP UE; Or

CCN generates the schedule information of CoMP UE, the schedule information of the CoMP UE of generation and user face data to be transmitted is sent to the serving BS of CoMP UE; Or

User face data to be transmitted and non-cooperating transmission mark are sent to the serving BS of CoMP UE by CCN.

In conjunction with the execution mode that the second of said method is possible, CCN generates the schedule information of CoMP UE, the schedule information of the CoMP UE of generation and user face data to be transmitted is sent to the serving BS of CoMP UE, specifically comprises:

CCN generates the schedule information of CoMP UE, the schedule information of the CoMP UE of generation and part user face data to be transmitted is sent to the serving BS of CoMP UE;

The serving BS of CoMP UE generates MAC PDU according to the schedule information of CoMP UE and part data to be transmitted, carries out the unicast of CoMP UE;

The serving BS of CoMP UE will pass the identification notification of data to CCN.

In conjunction with the execution mode that the second of said method is possible, user face data to be transmitted and non-cooperating transmission mark are sent to the serving BS of CoMP UE by CCN, specifically comprise:

Non-cooperating transmission mark and part user face data to be transmitted are sent to the serving BS of CoMP UE by CCN;

The serving BS of CoMP UE, according to non-cooperating transmission mark, is determined the schedule information of CoMP UE, is generated MAC PDU, carry out the unicast of CoMP UE according to schedule information and part data to be transmitted;

In conjunction with the third possible execution mode of said method, CCN, based on the user face downstream data paths of the SGW-CCN-CoMP UE serving BS-CoMP UE set up in advance, obtains the user face data to be transmitted of CoMP UE from SGW.

In conjunction with in the third possible execution mode of said method, the user face downstream data paths of the serving BS-CoMP UE of the SGW-CCN-CoMP UE set up in advance, specifically comprises:

In the initial radio resource control RRC connection establishment process of CoMP UE, set up the user face downstream data paths of the serving BS-CoMP UE of SGW-CCN-CoMP UE for CoMP UE; Or

After CoMP UE sets up RRC connection, be the user face downstream data paths that CoMP UE sets up the serving BS-CoMP UE of SGW-CCN-CoMP UE by route diversion mode.

In conjunction with in the third possible execution mode of said method, in the Initial R RC connection establishment process of CoMP UE, set up the user face downstream data paths of the serving BS-CoMP UE of SGW-CCN-CoMP UE for CoMP UE, specifically comprise:

The serving BS of CoMP UE receives the Attach Request message of CoMP UE;

The serving BS of CoMP UE is defined as CoMP UE when setting up the user face downstream data paths of SGW-CCN-CoMP UE serving BS-CoMP UE, and the S1-U that instruction core net sets up the serving BS of SGW-CCN-CoMP UE connects.

In conjunction with in the third possible execution mode of said method, the serving BS instruction core net of CoMP UE sets up the S1-U connection of the serving BS of SGW-CCN-CoMP UE, specifically comprises:

The serving BS of CoMP UE comprises the cooperation set of the serving BS of CoMP UE and the mapping relations of CCN according to what store, by the interface between CCN, the relevant information of Attach Request message and CoMP UE is sent to CCN;

CCN is by Attach Request message and the relevant information of CoMP UE and the related information transmission of CCN to Mobility Management Entity MME, and the S1-MME setting up the serving BS of MME-CCN-CoMP UE connects;

MME triggers the S1-U setting up the serving BS of SGW-CCN-CoMP UE and connects.

The serving BS of CoMP UE sends the message comprising EUTRAN cellular global identity ECGI corresponding to CCN to MME, user plane connection is switched between SGW and CCN by notice MME;

MME sets up the serving BS of SGW-CCN-CoMP UE S1-U according to notification triggers connects.

In conjunction with in the third possible execution mode of said method, also comprise:

MME notifies the cooperative multipoint transmission function activation of this CoMP UE of CCN.

The serving BS of CoMP UE receives the Attach Request message of CoMP UE;

The relevant information of the Attach Request message of reception and CoMP UE is sent to Mobility Management Entity MME by the serving BS of CoMP UE;

MME is defined as CoMP UE when setting up the user face downstream data paths of the serving BS-CoMP UE of SGW-CCN-CoMP UE, the cooperation set of the serving BS of CoMP UE and the mapping relations of CCN are comprised according to what store, by EUTRAN cellular global identity ECGI corresponding for CCN, replace ECGI corresponding to the serving BS of CoMPUE and inform SGW.

MME notifies that the serving BS user face downstream data paths of CoMP UE is the serving BS of SGW-CCN-CoMP UE;

MME notifies the cooperative multipoint transmission function activation of this CoMP UE of CCN, and user face downstream data paths is the serving BS of SGW-CCN-CoMP UE.

MME sends chain of command path change Indication message to the serving BS/CCN of CoMP UE, and notice chain of command path change is the serving BS of MME-CCN-CoMP UE.

In conjunction with in the third possible execution mode of said method, after CoMP UE sets up RRC connection, be the user face downstream data paths that CoMP UE sets up the serving BS-CoMP UE of SGW-CCN-CoMP UE by route diversion mode, specifically comprise:

After CoMP UE sets up RRC connection, when the serving BS of CoMP UE determines that triggering CoMP UE carries out cooperative multipoint transmission, carry out user face downstream data paths by path handoff procedure notice MME and switch;

MME is according to notice, and change user face downstream data paths is the serving BS of SGW-CCN-CoMP UE.

The serving BS of CoMP UE is identified by CoMP UE and cooperative multipoint transmission request sends to CCN;

The serving BS of CoMP UE receives the cooperative multipoint transmission response of CCN feedback.

In conjunction with in the third possible execution mode of said method, the serving BS of CoMP UE determines that triggering CoMP UE carries out cooperative multipoint transmission, specifically comprises:

The serving BS of CoMP UE reports according to the measurement of CoMP UE, determines whether that triggering CoMP UE carries out cooperative multipoint transmission; Or

The serving BS of CoMP UE, according to the positional information of CoMP UE, determines whether that triggering CoMP UE carries out cooperative multipoint transmission; Or

When the triggering CoMP UE that the serving BS of CoMP UE sends when receiving CCN activation carries out cooperative multipoint transmission notice, determine that triggering CoMP UE carries out cooperative multipoint transmission.

In conjunction with in the third possible execution mode of said method, send to the serving BS of CoMP UE when CCN activates and trigger the notice that CoMP UE carries out cooperative multipoint transmission; Or

CSI, CoMP UE positional information that CCN reports according to each cooperation transmission point, determines that triggering CoMP UE carries out cooperative multipoint transmission, and when CCN activates, CCN sends to the serving BS of CoMP UE the notice that triggering CoMP UE carries out cooperative multipoint transmission.

In conjunction with in the third possible execution mode of said method, when the serving BS of CoMP UE or CCN determine the cooperative multipoint transmission of no longer dispatching CoMP UE, the cooperative multipoint transmission function of mutual deexcitation CoMP UE, and be the user face downstream data paths that CoMP UE sets up the serving BS-CoMP UE of SGW-CoMP UE by route diversion mode.

In conjunction with in the third possible execution mode of said method, after CoMP UE sets up RRC connection, be the user face downstream data paths that CoMP UE sets up the serving BS-CoMP UE of SGW-CCN-CoMP UE by route diversion mode, comprise:

Set up after RRC connects at CoMP UE, cell merge excessively in, the destination service base station of CoMP UE is carried out user face downstream data paths by path handoff procedure notice MME and is switched;

In conjunction with in the third possible execution mode of said method, when the serving BS of CoMP UE and CCN are not integrated in same node, comprise further:

The serving BS of CoMP UE triggers and is connected with the RRC between COMP UE, switches to the RRC between COMP UE and CCN to connect.

In conjunction with the 4th kind of possible execution mode of said method, CCN is the serving BS of CoMP UE, and the user face downstream data paths of the serving BS-CoMP UE of the SGW-CCN-CoMP UE set up in advance, specifically comprises:

The former serving BS of CoMP UE triggers when CoMP UE carries out cooperative multipoint transmission initiates handoff procedure, and the serving BS of CoMP UE is switched to CCN.

In conjunction with in the 4th kind of possible execution mode of said method, the former serving BS of CoMP UE reports according to the measurement of CoMP UE, determines whether that triggering CoMP UE carries out cooperative multipoint transmission; Or

The former serving BS of CoMP UE, according to the positional information of CoMP UE, determines whether that triggering CoMP UE carries out cooperative multipoint transmission; Or

When the triggering CoMP UE that the former serving BS of CoMP UE sends when receiving CCN activation carries out cooperative multipoint transmission notice, determine that triggering CoMP UE carries out cooperative multipoint transmission.

In conjunction with in the 4th kind of possible execution mode of said method, send to the serving BS of CoMP UE when CCN activates and trigger the notice that CoMP UE carries out cooperative multipoint transmission; Or

The present invention also provides a kind of data transmission method of cooperative multipoint transmission central dispatching, comprising:

The channel condition information CSI of all UE and the user face data amount to be transmitted of non-cooperating multicast communication user terminal CoMP UE under cooperation transmission point reports described CCN to CCN;

Cooperation transmission point, by communicating with CCN, determines the CoMP resource that CoMP UE transfer of data uses, and utilizes CoMP resource to perform the user face data scheduled transmission of CoMP UE, utilizes non-CoMP resource to perform the user face data scheduled transmission of non-CoMP UE.

In conjunction with the first possible execution mode of said method, cooperation transmission point utilizes CoMP resource to perform the user face data scheduled transmission of CoMP UE, specifically comprises:

Receive schedule information and the media access control protocol data unit MAC PDU of the CoMP UE of transmission when CCN determines that CoMP UE carries out coordinated multipoint transmission;

Determine the CoMP resource that CoMP UE transfer of data uses on PDSCH, to utilize CoMP resource transmission MAC PDU according to schedule information.

In conjunction with in the first possible execution mode of said method, CCN dispatches CoMP UE and carries out cooperative multipoint transmission, and described cooperation transmission point is the serving BS of CoMP UE, also comprises:

When the serving BS of CoMP UE is determined to need data re-transmission according to the Negative Acknowledgement NACK feedback information of CoMP UE, and utilize current non-CoMP scheduling of resource CoMP UE data re-transmission.

In conjunction with in the first possible execution mode of said method, the serving BS of CoMP UE utilizes current non-CoMP scheduling of resource CoMP UE data re-transmission, specifically comprises:

In conjunction with in the first possible execution mode of said method, also comprise:

If the serving BS of CoMP UE is to the synchronization of CoMP UE data retransmission, determine that the serving BS of CCN scheduling CoMP UE carries out new data transmission to CoMP UE, the ACK/NACK that the serving BS of CoMP UE receives new data and data retransmission respectively by two HARQ feeds back.

In conjunction with the execution mode that the second of said method is possible, CCN dispatches CoMP UE and carries out non-cooperating multicast communication, described cooperation transmission point is the serving BS of CoMP, and cooperation transmission point utilizes CoMP resource to perform the user face data scheduled transmission of CoMP UE, specifically comprises:

Receive schedule information and the media access control protocol data unit MAC PDU of the CoMP UE that CCN sends, determine the CoMP resource that CoMP UE transfer of data uses on PDSCH, to utilize CoMP resource transmission MAC PDU according to schedule information; Or

According to schedule information and the user face data to be transmitted generation MAC PDU of the CoMP UE of CCN transmission, determine the CoMP resource that CoMP UE transfer of data uses on PDSCH, to utilize CoMP resource transmission MAC PDU according to schedule information; Or

Receive user face data to be transmitted and the non-cooperating transmission mark of CCN transmission, determine that CoMP UE carries out non-CoMP transmission, from the resource outside the CoMP resource determined by CCN schedule information, determine that CoMP UE carries out the CoMP resource of non-CoMP transmission use, generate MAC PDU according to the CoMP resource determined, PDSCH utilizes the CoMP resource transmission MAC PDU determined.

In conjunction with the third possible execution mode of said method, described cooperation transmission point is the serving BS of CoMP, also comprises:

The serving BS of CoMP UE receives the Attach Request message of CoMP UE;

The serving BS of CoMP UE comprises the cooperation set of the serving BS of CoMP UE and the mapping relations of CCN according to what store, by the interface between CCN, the relevant information of Attach Request message and CoMP UE is sent to CCN, by CCN by Attach Request message and the relevant information of CoMP UE and the related information transmission of CCN to Mobility Management Entity MME, the S1-MME setting up the serving BS of MME-CCN-CoMP UE connects; Or

The serving BS of CoMP UE sends the message comprising EUTRAN cellular global identity ECGI corresponding to CCN to MME, user plane connection is switched between SGW and CCN by notice MME, and the S1-U being set up the serving BS of SGW-CCN-CoMP UE by MME according to notification triggers connects.

In conjunction with the 4th kind of possible execution mode of said method, described cooperation transmission point is the serving BS of CoMP, also comprises:

After CoMP UE sets up RRC connection, when the serving BS of CoMP UE determines that triggering CoMP UE carries out cooperative multipoint transmission, carrying out user face downstream data paths by path handoff procedure notice MME to switch, is the serving BS of SGW-CCN-CoMP UE by change user face downstream data paths.

In conjunction with in the 4th kind of possible execution mode of said method, also comprise:

In conjunction with in the 4th kind of possible execution mode of said method, the serving BS of CoMP UE determines that triggering CoMP UE carries out cooperative multipoint transmission, specifically comprises:

In conjunction with the 4th kind of possible execution mode of said method, when the serving BS of CoMP UE and CCN are not integrated in same node, comprise further:

The present invention also provides a kind of center cooperative node CCN, comprising:

Data receipt unit, for obtaining the user face data to be transmitted of cooperative multipoint transmission user terminal CoMP UE from gateway SGW;

Channel information acquisition unit, for obtaining the channel condition information CSI of all UE and the user face data amount to be transmitted of non-CoMP UE from belonging to the same all cooperation transmission points in gathering that cooperate with CCN;

Scheduling unit, for according to the user face data amount to be transmitted of all UE and CSI, the cooperation transmission of dispatching with CCN point communicates, and performs the scheduled transmission of the user face data of CoMP UE.

The present invention also provides a kind of CCN, comprises processor and data transceiver interface, wherein:

Processor is configured to: the user face data to be transmitted obtaining cooperative multipoint transmission user terminal CoMP UE from SGW; The channel condition information CSI of all UE and the user face data amount to be transmitted of non-CoMP UE is obtained from belonging to the same all cooperation transmission points in gathering that cooperate with CCN; According to user face data amount to be transmitted and the CSI of all UE, the cooperation transmission of dispatching with CCN point communicates, and performs the scheduled transmission of the user face data of CoMP UE;

Described data transceiver interface, for realizing the data transmit-receive between processor and SGW, cooperation transmission point.

Preferably, the cooperation transmission point that scheduling unit and CCN dispatch communicates, and performs the scheduled transmission of the user face data of CoMP UE, specifically comprises:

Preferably, when the cooperation transmission point of CoMP UE does not comprise the serving BS of CoMP UE, the schedule information generated and MAC PDU are also notified the serving BS of CoMP UE by scheduling unit.

Preferably, scheduling unit is when the serving BS scheduling CoMP UE data re-transmission of possible CoMP UE, and the serving BS not dispatching CoMP UE carries out new data transmission to CoMP UE; Or

Scheduling unit receives the serving BS of CoMP UE to before the ACK feedback of data retransmission, and the serving BS not dispatching CoMP UE carries out new data transmission to CoMP UE.

According to user face data amount size to be transmitted and the CSI of all UE, when determining that CoMP UE carries out non-coordinated multipoint transmission, then:

Generate schedule information and the media access control protocol data unit MAC PDU of CoMP UE, the schedule information of generation and MAC PDU are sent to the serving BS of CoMP UE; Or

Generate the schedule information of CoMP UE, the schedule information of the CoMP UE of generation and user face data to be transmitted are sent to the serving BS of CoMP UE; Or

User face data to be transmitted and non-cooperating transmission mark are sent to the serving BS of CoMP UE.

Preferably, scheduling unit generates the schedule information of CoMP UE, the schedule information of the CoMP UE of generation and user face data to be transmitted is sent to the serving BS of CoMP UE, specifically comprises:

Preferably, user face data to be transmitted and non-cooperating transmission mark are sent to the serving BS of CoMP UE by scheduling unit, specifically comprise:

Preferably, data receipt unit, based on the user face downstream data paths of the SGW-CCN-CoMP UE serving BS-CoMP UE set up in advance, obtains the user face data to be transmitted of CoMP UE from SGW.

Preferably, also comprise: attachment message reception units, the relevant information of the Attach Request message that the serving BS for receiving CoMP UE sends and CoMP UE;

Dispatch Unit, for by Attach Request message and the relevant information of CoMP UE and the related information transmission of CCN to Mobility Management Entity MME, the S1-MME setting up the serving BS of MME-CCN-CoMP UE connects.

Preferably, also comprising: notification unit, triggering for sending to the serving BS of CoMP UE when CCN activates the notice that CoMP UE carries out cooperative multipoint transmission; Or according to CSI, CoMP UE positional information that each cooperation transmission point reports, determine that triggering CoMP UE carries out cooperative multipoint transmission, and when CCN activates, the serving BS to CoMP UE sends and triggers the notice that CoMP UE carries out cooperative multipoint transmission.

The present invention also provides a kind of cooperation transmission point, and described cooperation transmission Dian You center cooperative node CCN dispatches, comprising:

Report unit, for reporting the channel condition information CSI of all UE and the user face data amount to be transmitted of non-CoMP UE that communicate with described cooperation transmission point to CCN;

Scheduled transmission unit, for by communicating with CCN, determine the CoMP resource that cooperative multipoint transmission user terminal CoMP UE transfer of data uses, utilize CoMP resource to perform the user face data scheduled transmission of CoMP UE, utilize non-CoMP resource to perform the user face data scheduled transmission of non-CoMP UE.

The present invention also provides a kind of cooperation transmission point, comprises processor and data transceiver interface, wherein:

Described processor is configured to: report the channel condition information CSI of all UE and the user face data amount to be transmitted of non-CoMP UE that communicate with described cooperation transmission point to CCN; By communicating with CCN, determine the CoMP resource that cooperative multipoint transmission user terminal CoMP UE transfer of data uses, utilize CoMP resource to perform transmission or the scheduled transmission of the user face data of CoMP UE, utilize non-CoMP resource to perform the user face data scheduled transmission of non-CoMP UE;

Described data transceiver interface, for realizing the data transmit-receive under described processor and CCN and cooperation transmission point between UE.

Preferably, scheduled transmission unit utilizes CoMP resource to perform the user face data scheduled transmission of CoMP UE, specifically comprises:

Preferably, CCN dispatches CoMP UE and carries out cooperative multipoint transmission, and described transfer point is the serving BS of CoMP UE, also comprises:

Retransmission unit, during for determining to need data re-transmission according to the Negative Acknowledgement NACK feedback information of CoMP UE, utilizes current non-CoMP scheduling of resource CoMP UE data re-transmission.

Preferably, retransmission unit utilizes current non-CoMP scheduling of resource CoMP UE data re-transmission, specifically comprises:

The serving BS of CCN scheduling CoMP UE is utilized to carry out the moment outside new data transmission to CoMP UE, scheduling CoMP UE data re-transmission.

Preferably, described retransmission unit also for:

To the synchronization of CoMP UE data retransmission, determine that the serving BS of CCN scheduling CoMP UE carries out new data transmission to CoMP UE, the ACK/NACK being received new data and data retransmission by two HARQ is respectively fed back.

Preferably, CCN dispatches CoMP UE and carries out non-cooperating multicast communication, and described transfer point is the serving BS of CoMP, and scheduled transmission unit utilizes CoMP resource to perform the user face data scheduled transmission of CoMP UE, specifically comprises:

Preferably, described cooperation transmission point is the serving BS of CoMP, also comprises:

Attachment receiving element, for receiving the Attach Request message of CoMP UE;

Indicating member, for be defined as CoMP UE set up the user face downstream data paths of SGW-CCN-CoMP UE serving BS-CoMP UE time, instruction core net set up the serving BS of SGW-CCN-CoMP UE S1-U connect.

Preferably, the S1-U that indicating member instruction core net sets up the serving BS of SGW-CCN-CoMP UE connects, and specifically comprises:

The cooperation set of the serving BS of CoMP UE and the mapping relations of CCN are comprised according to what store, by the interface between CCN, the relevant information of Attach Request message and CoMP UE is sent to CCN, by CCN by Attach Request message and the relevant information of CoMP UE and the related information transmission of CCN to Mobility Management Entity MME, the S1-MME setting up the serving BS of MME-CCN-CoMP UE connects; Or

Send the message comprising EUTRAN cellular global identity ECGI corresponding to CCN to MME, user plane connection is switched between SGW and CCN by notice MME, and the S1-U being set up the serving BS of SGW-CCN-CoMP UE by MME according to notification triggers connects.

Change indicating member, for set up RRC connection at CoMP UE after, when determining that triggering CoMP UE carries out cooperative multipoint transmission, carrying out user face downstream data paths switch by path handoff procedure notice MME, is the serving BS of SGW-CCN-CoMP UE by change user face downstream data paths.

CoMP indicating member, for sending to CCN by CoMP UE mark and cooperative multipoint transmission request;

CoMP responds receiving element, for receiving the cooperative multipoint transmission response of CCN feedback.

Preferably, change indicating member determines that triggering CoMP UE carries out cooperative multipoint transmission, specifically comprises:

Measurement according to CoMP UE reports, and determines whether that triggering CoMP UE carries out cooperative multipoint transmission; Or

According to the positional information of CoMP UE, determine whether that triggering CoMP UE carries out cooperative multipoint transmission; Or

When the triggering CoMP UE sent when receiving CCN activation carries out cooperative multipoint transmission notice, determine that triggering CoMP UE carries out cooperative multipoint transmission.

Preferably, when the serving BS of CoMP UE and CCN are not integrated in same node, comprise further:

RRC switch unit, is connected the RRC between the serving BS of CoMP UE with COMP UE for triggering, and switches to the RRC between COMP UE and CCN to connect.

The present invention gives a kind of between base station under imperfect backhaul scene, realize the data transmission method of cooperative multipoint transmission center cooperative scheduling, the method strengthens existing LTE-A framework, can to solve under imperfect backhaul scene by CCN as user data transmission process problem during scheduling controlling node, help network side to realize scheduling decision to CoMP user and data transmission and processing timely and accurately, reduce the impact of backhaul time delay on CoMP central dispatching.

Accompanying drawing explanation

Fig. 1 is the information interaction schematic diagram of non-central scheduling;

The information interaction schematic diagram dispatched centered by Fig. 2;

Fig. 3 is the E-UTRAN network architecture;

Fig. 4 is the data transmission method flow chart of embodiment of the present invention CCN side cooperative multipoint transmission central dispatching;

Fig. 5 is the data transmission method flow chart of embodiment of the present invention transfer point side cooperative multipoint transmission central dispatching;

Fig. 6 is the user face downstream data paths schematic diagram that the embodiment of the present invention 1 sets up the serving BS-CoMP UE of SGW-CCN-CoMP UE;

Fig. 7 a is the data transmission architecture figure of embodiment 1 foundation when not carrying out RRC;

Fig. 7 b is the data transmission architecture figure that embodiment 1 carries out setting up after RRC switches;

Fig. 8 is the user face downstream data paths schematic diagram that the embodiment of the present invention 2 and embodiment 3 set up the serving BS-CoMP UE of SGW-CCN-CoMP UE;

Fig. 9 a is the data transmission architecture figure that the embodiment of the present invention 2 is set up;

Fig. 9 b is the data transmission architecture figure that the embodiment of the present invention 3 is set up;

Figure 10 is heterogeneous network schematic diagram;

The cooperation center node CCN schematic diagram that Figure 11 provides for the embodiment of the present invention;

The transfer point schematic diagram that Figure 12 provides for the embodiment of the present invention.

Embodiment

Below in conjunction with drawings and Examples, the data transmission method of cooperative multipoint transmission central dispatching provided by the invention and Apparatus and system are illustrated in greater detail.

In order to reduce the adjacent area interference of MPS process edge user terminal, improve the experience of cell boundary user terminal, Long Term Evolution strengthens (long term evolution-advance, LTE-A) system have employed cooperative multipoint transmission technology (coordinated-multiple-point, CoMP), and with its whether exist Centroid carry out global optimization scheduling the implementation of CoMP technology is divided into non-central cooperative scheduling and center cooperative scheduling two kinds.Consider real network situation, LTE-A version 12 introduces the CoMP scene of imperfect backhaul.In the center cooperative scheduling situation of imperfect backhaul, because the scheduling controlling function of CoMP UE will be realized by center cooperative node CCN, and between CCN and eNB, between service eNB and other eNB, there is the backhaul delay problem (typical unidirectional backhaul time delay value is 10ms) of can not ignore, therefore need to consider that the scheduling under this scene realizes and transmission feedback problem of implementation.

The embodiment of the present invention provides a kind of data transmission system of cooperative multipoint transmission central dispatching, comprising:

The CoMP UE of embodiment of the present invention indication, refer to the UE with CoMP ability, CCN determines the scheduling scheme of CoMP UE, can dispatch this CoMP UE and carry out cooperative multipoint transmission, also can dispatch this CoMP UE and carry out non-cooperating multicast communication, the present embodiment is called unicast.The non-CoMP UE of the present embodiment indication, refers to the UE without CoMP ability, CoMP resource, specifically refer to that CoMP UE transmits the resource used, and no matter whether this CoMP UE carries out cooperative multipoint transmission.

The embodiment of the present invention is when CCN center cooperative scheduling function activation, and each cooperation transmission point of CCN scheduling needs, by the CSI information transmission of user terminal to CCN, to be communicated with cooperation transmission point by CCN, performs the scheduling controlling function of CoMP UE.The cooperation transmission point of CCN scheduling, according to the communication with CNN, determine the CoMP resource of CoMP UE transfer of data, utilize CoMP resource to perform the user face data scheduled transmission of CoMP UE, and for non-CoMP UE, decided in its sole discretion transmission plan by cooperation transmission point and transmitted.

Therefore, the data transmission architecture of data transmission system that the embodiment of the present invention provides is: the transmission path of user face data is SGW-CCN-cooperation transmission point-UE.Can to solve under imperfect backhaul scene by CCN as user data transmission process problem during scheduling controlling node, help network side to realize scheduling decision to CoMP user and data transmission and processing timely and accurately, reduce the impact of backhaul time delay on CoMP central dispatching.

Provide the data transmission method that the embodiment of the present invention is applied to the cooperative multipoint transmission central dispatching of said system below, as shown in Figure 4, comprising:

Step 401, center cooperative node CCN obtains the user face data to be transmitted of cooperative multipoint transmission user terminal CoMP UE from gateway SGW;

Step 402, CCN obtains the channel condition information CSI of all UE and the user face data amount to be transmitted of non-CoMP UE from belonging to the same all cooperation transmission points gathered that cooperate with it;

Step 403, CCN is according to the user face data amount to be transmitted of all UE and CSI, and the cooperation transmission of dispatching with CCN point communicates, and performs the scheduled transmission of the user face data of CoMP UE.

CCN is according to the user face data amount to be transmitted of all UE and CSI, the scheduling scheme of CoMP UE can be determined, be specially and determine that CoMP UE carries out coordinated multipoint transmission and still carries out non-coordinated multipoint transmission, as carried out coordinated multipoint transmission, the coordinated multipoint transmission scheme of concrete employing, when CoMP UE is carried out to coordinated multipoint transmission or carries out non-coordinated multipoint transmission, the scheduled transmission performing the user face data of CoMP UE is concrete respectively adopts following scheme:

1) CCN determines that CoMP UE carries out coordinated multipoint transmission

CCN is according to the user face data amount size to be transmitted of all UE and CSI, when determining that CoMP UE carries out coordinated multipoint transmission, CCN selects the cooperation transmission point of CoMP UE, and generate schedule information and the media access control protocol data unit MAC PDU of CoMP UE, preferably, according to user face data to be transmitted and the schedule information generation MAC PDU of CoMP UE;

Therefore, the transmission path of user face data is SGW-CCN-cooperation transmission point-CoMP UE.

In order to support the process of data retransmission, preferably, when the cooperation transmission point of CoMP UE does not comprise the serving BS of CoMP UE, the schedule information generated and MAC PDU are also notified the serving BS of CoMP UE by CCN.The embodiment of the present invention adopts following processing mode for data retransmission:

For the CoMP UE carrying out coordinated multipoint transmission, when the serving BS of CoMP UE is determined to need data re-transmission according to the Negative Acknowledgement NACK feedback information of CoMP UE, determine CoMP resource according to the schedule information of CCN, and utilize current non-CoMP scheduling of resource CoMP UE data re-transmission.

CoMP resource comprises time-domain resource and frequency domain resource, and preferably, the serving BS of CoMP UE utilizes current non-CoMP scheduling of resource CoMP UE data re-transmission, specifically comprises:

Namely the different time-domain resource scheduling transmission of new data and the transmission of data retransmission is utilized.

In order to the transmission generation resource contention of the transmission and data retransmission of evading new data, corresponding treatment measures can also be performed in CNN side:

Further preferably, when the serving BS for the CoMP UE carrying out coordinated multipoint transmission, CoMP UE is determined to need data re-transmission according to the Negative Acknowledgement NACK feedback information of CoMP UE, to CoMP UE data retransmission; If the serving BS of CoMP UE is to the synchronization of CoMP UE data retransmission, the serving BS that CCN dispatches CoMP UE carries out new data transmission to CoMP UE, then the ACK/NACK that the serving BS of CoMP UE receives new data and data retransmission respectively by two HARQ feeds back.

2) CCN determines that CoMP UE carries out non-coordinated multipoint transmission

CCN, according to the user face data amount size to be transmitted of all UE and CSI, when determining that CoMP UE carries out non-coordinated multipoint transmission, preferably adopts following arbitrary processing mode:

Processing mode one, CCN generates schedule information and the media access control protocol data unit MAC PDU of CoMP UE, the schedule information of generation and MAC PDU is sent to the serving BS of CoMP UE;

Processing mode two, CCN generates the schedule information of CoMP UE, the schedule information of the CoMP UE of generation and user face data to be transmitted is sent to the serving BS of CoMP UE;

User face data to be transmitted and non-cooperating transmission mark are sent to the serving BS of CoMP UE, namely by the transmission means of the serving BS decision-making CoMP UE of CoMP UE by processing mode three, CCN.

Preferably, CCN generates the schedule information of CoMP UE, the schedule information of the CoMP UE of generation and user face data to be transmitted is sent to the serving BS of CoMP UE, specifically comprises:

Preferably, user face data to be transmitted and non-cooperating transmission mark are sent to the serving BS of CoMP UE by CCN, specifically comprise:

User face data gradation to be transmitted is sent to the serving BS of CoMP UE by CCN, after the response receiving its transmission success, then transmits all the other remaining parts user face data to be transmitted.

Below from the cooperation transmission point side of CCN scheduling, provide a kind of data transmission method being applied to the cooperative multipoint transmission central dispatching of said system, as shown in Figure 5, comprising:

Step 501, the channel condition information CSI of all UE and the user face data amount to be transmitted of non-cooperating multicast communication user terminal CoMP UE under cooperation transmission point reports described CCN to CCN;

Step 502, cooperation transmission point, by communicating with CCN, determines the CoMP resource that CoMP UE transfer of data uses, and utilizes CoMP resource to perform the user face data scheduled transmission of CoMP UE, utilizes non-CoMP resource to perform the user face data scheduled transmission of non-CoMP UE.

Preferably, cooperation transmission point utilizes CoMP resource to perform the user face data scheduled transmission of CoMP UE, specifically comprises:

Preferably, CCN dispatches CoMP UE and carries out cooperative multipoint transmission, and described cooperation transmission point is the serving BS of CoMP UE, also comprises:

Preferably, the serving BS of CoMP UE utilizes current non-CoMP scheduling of resource CoMP UE data re-transmission, specifically comprises:

Preferably, also comprise: if the serving BS of CoMP UE is to the synchronization of CoMP UE data retransmission, determine that the serving BS of CCN scheduling CoMP UE carries out new data transmission to CoMP UE, the ACK/NACK that the serving BS of CoMP UE receives new data and data retransmission respectively by two HARQ feeds back.

Preferably, CCN dispatches CoMP UE and carries out non-cooperating multicast communication, and described cooperation transmission point is the serving BS of CoMP, and cooperation transmission point utilizes CoMP resource to perform the user face data scheduled transmission of CoMP UE, specifically comprises:

Preferably, embodiment of the present invention CCN, based on the user face downstream data paths of the SGW-CCN-CoMP UE serving BS-CoMP UE set up in advance, obtains the user face data to be transmitted of CoMP UE from SGW.

Preferably, in the initial radio resource control RRC connection establishment process of CoMP UE, the user face downstream data paths of the serving BS-CoMP UE of SGW-CCN-CoMP UE is set up for CoMP UE; Or after CoMP UE sets up RRC connection, be the user face downstream data paths that CoMP UE sets up the serving BS-CoMP UE of SGW-CCN-CoMP UE by route diversion mode.

The preferred implementation of the user face downstream data paths of the serving BS-CoMP UE of the SGW-CCN-CoMP UE set up in advance is provided below in conjunction with embodiment.

Embodiment 1

The present embodiment, in the Initial R RC connection establishment process of CoMP UE, is set up the user face downstream data paths of the serving BS-CoMP UE of SGW-CCN-CoMP UE, being comprised for CoMP UE:

The serving BS of CoMP UE receives the Attach Request message of CoMP UE;

Specifically in the following way:

As shown in Figure 6, detailed implementation process is as follows:

1) the Non-Access Stratum NAS layer of UE initiates attachment request attach request message, and this NAS message triggers Initial R RC connection procedure after arriving the rrc layer of UE.The NAS message of attach request is included in the RRC returned to service eNB and has set up in message and send to service eNB by UE.

Attach request message comprises UE relevant information, specifically comprise IMSI(International Mobile Subscriber Identity, international mobile subscriber identification code), the message such as UE core net ability UE Core Network Capability, UE also needs to report UE wireless network capability in addition, and namely whether UE supports cooperative multipoint transmission ability.

2), after service eNB receives Attach request, know that UE has the ability supporting CoMP transmission.Service eNB is the serving BS-CoMP UE of SGW-CCN-CoMP UE to the user-plane transmissions path that the factors such as the tenability situation of CoMP and network side strategy judge whether to set up CoMP UE according to the tenability of the CoMP of UE, current network, if, perform step 3), if not, then user plane path is set up according to existing protocol.

3) when being judged as YES, Path Connection is set up according to the serving BS-CoMP UE of SGW-CCN-CoMP UE, be specially the cooperation set (comprise service eNB, cell Node etc.) of service eNB according to storage and the mapping relations (as OAM configuration notification) of CCN, by the interface between CCN, Attach request message and UE relevant information are sent to CCN.

Preferably, UE relevant information comprises CSG(Close Subscriber Group, close and contracted user's group) access module, CSG ID, TAI(Tracking Area Identity, tracking area identification) etc. information, the message transmitting these information can be the new X2AP procedure message aiming at the definition of CoMP function, also can be the message expanded for CoMP existing X2AP protocol procedures, also can be procedure message between other nodes (interface set up between CCN and eNB can be X2 interface or other existing or new interfaces introduced).

4) after CCN receives the information of service eNB notice, think this CoMP UE cooperative multipoint transmission function activation, and by Attach Request message and the relevant information of CoMP UE and the related information transmission of CCN to MME, and then the S1-MME of the serving BS setting up MME-CCN-CoMP UE connects.

Preferably, the relevant information of CCN comprises: ECGI(EUTRAN Cell Global Identity, EUTRAN cellular global identity), ECGI is PLMN(Public Land Mobile Network belonging to CCN, Public Land Mobile Nerwork) and CCN ID respective cell mark Cell Identity composition.

Preferably, CCN passes through S1-MME control message by above-mentioned information transmission to MME.

5) MME triggers the S1-U connection of setting up the serving BS of SGW-CCN-CoMP UE, and the same existing protocol of specific implementation, see accompanying drawing 6, no longer can describe in detail here.

Based on said process, as shown in Figure 7a, the data transmission architecture that the embodiment of the present invention is set up is: the user plane data transfer path of CoMP UE is: S-GW<->CCN<-Grea tT.GreaT.GT serving BS <->UE; The chain of command data transfer path of CoMP UE is: MME<->CCN<-Great T.GreaT.GT serving BS <->UE; Transmitting scheduling information path between CCN and cooperation transmission point is: each cooperation transmission point of CCN-.

Alternatively, when the serving BS of CoMP UE and CCN are not integrated in same node, consider and reduce Access Network handover overhead, follow-up service eNB can trigger handoff procedure as required, as under support carrying is separated and CCN node is the scene of macro base station, is connected by CoMP UE with the RRC of network-side service eNB, the RRC between COMP UE and CCN is switched to connect, then data transmission architecture as shown in Figure 7b, and concrete handoff procedure is existing process, no longer describes in detail here.

Alternatively, when RRC connection of eating dishes without rice or wine switches between CCN and UE, RRC signaling issues UE by CCN.

The transfer of data of the cooperative multipoint transmission central dispatching adopting the above embodiment of the present invention to provide based on above-mentioned data transmission architecture carries out transfer of data, no longer repeats here.

Embodiment 2

The present embodiment is in the Initial R RC connection establishment process of CoMP UE, eNB is the transmission intermediate transit point of CoMP UE and core net according to CoMP UE ability selection CCN, sets up the user face downstream data paths of the serving BS-CoMP UE of SGW-CCN-CoMP UE for CoMP UE.

Specifically in the following way:

The serving BS of CoMP UE receives the Attach Request message of CoMP UE;

The serving BS of CoMP UE is defined as CoMP UE when setting up the user face downstream data paths of SGW-CCN-CoMP UE serving BS-CoMP UE, and the S1-U that instruction core net sets up the serving BS of SGW-CCN-CoMP UE connects, and specifically comprises:

As shown in Figure 8, detailed implementation process is as follows:

3) service eNB sends the message comprising EUTRAN cellular global identity ECGI corresponding to CCN to MME, and user plane connection is switched between SGW and CCN by notice MME;

Preferably, when service eNB reports NAS request by S1-MME control message, notify that S1 user plane is switched between SGW and CCN by MME, and S1-MME is still retained between eNB and MME simultaneously.This S1-MME control message needs to comprise CCN ECGI and user plane switching instruction.

4) MME triggering SGW carries out S1-U conversion.

Be specially MME in the processes such as establishment session request create session request, by EUTRAN cellular global identity ECGI corresponding for CCN, replace ECGI corresponding to the serving BS of CoMP UE and inform SGW, the same existing protocol of follow-up implementation, and then the S1-U of the serving BS setting up SGW-CCN-CoMP UE connects

Preferably, also comprise: MME notifies the cooperative multipoint transmission function activation of this CoMP UE of CCN.

Based on said process, as illustrated in fig. 9, the data transmission architecture that the embodiment of the present invention is set up is: the user plane data transfer path of CoMP UE is: S-GW<->CCN<-Grea tT.GreaT.GT serving BS <->UE; The chain of command data transfer path of CoMP UE is: MME<-> serving BS <->UE; Transmitting scheduling information path between CCN and cooperation transmission point is: each cooperation transmission point of CCN-.

In addition, chain of command data path can also be switched to MME<->CCN<-Great T.GreaT.GT serving BS <->UE by MME, then MME can send chain of command path change Indication message, and notice eNB/CCN chain of command path change is MME<->CCN<-Great T.GreaT.GT serving BS <->UE.

Alternatively, when the serving BS of CoMP UE and CCN are not integrated in same node, consider and reduce Access Network handover overhead, follow-up service eNB can trigger handoff procedure as required, CoMP UE is connected with the RRC of network-side service eNB, switch to the RRC between COMP UE and CCN to connect, concrete handoff procedure is existing process, no longer describes in detail here.

Embodiment 3

The present embodiment is in the Initial R RC connection establishment process of CoMP UE, MME is the transmission intermediate transit point of CoMP UE and core net according to CoMP UE ability selection CCN, sets up the user face downstream data paths of the serving BS-CoMP UE of SGW-CCN-CoMP UE for CoMP UE.

Specifically in the following way:

The serving BS of CoMP UE receives the Attach Request message of CoMP UE;

MME is defined as CoMP UE when setting up the user face downstream data paths of the serving BS-CoMP UE of SGW-CCN-CoMP UE, the cooperation set of the serving BS of CoMP UE and the mapping relations of CCN are comprised according to what store, by EUTRAN cellular global identity ECGI corresponding for CCN, replace ECGI corresponding to the serving BS of CoMP UE and inform SGW.

As shown in Figure 8, detailed implementation process is as follows:

2), after service eNB receives Attach request, the relevant information of the Attach Request message of reception and CoMP UE is sent to MME;

Preferably, the relevant information of CoMP UE comprises: the information such as CSG access mode, CSG ID, TAI+ECGI.

Preferably, service eNB passes through S1-MME control message by above-mentioned information transmission to MME.

3) according to the S1-MME control message that eNB sends, MME knows that UE supports cooperative multipoint transmission ability, and is SGW-CCN-transfer point-UE according to the user-plane transmissions path that current network judges whether to set up CoMP UE to factors such as the tenability situation of CoMP and network side strategies; If so, perform step 4), if not, perform according to existing protocol.

4) the cooperation set that comprise the serving BS of CoMP UE of MME according to storage and the mapping relations (as OAM configuration notification) of CCN, in the processes such as establishment session request create session request, by EUTRAN cellular global identity ECGI corresponding for CCN, replace ECGI corresponding to the serving BS of CoMP UE and inform SGW, the same existing protocol of follow-up implementation, and then the S1-U of the serving BS setting up SGW-CCN-CoMP UE connects.In addition, chain of command data path can also be switched to MME<->CCN<-Great T.GreaT.GT serving BS <->UE by MME.

Based on said process, as shown in figure 9b, the data transmission architecture that the embodiment of the present invention is set up is: the user plane data transfer path of CoMP UE is: S-GW<->CCN<-Grea tT.GreaT.GT serving BS <->UE; The chain of command data transfer path of CoMP UE is: MME<->CCN<-Great T.GreaT.GT serving BS <->UE; Transmitting scheduling information path between CCN and cooperation transmission point is: each cooperation transmission point of CCN-.

Preferably, also comprise: MME notifies that the serving BS user face downstream data paths of CoMP UE is the serving BS of SGW-CCN-CoMP UE;

In addition, follow-up MME can send chain of command path change Indication message, notice eNB/CCN chain of command path change is MME<->CCN<-Great T.GreaT.GT serving BS <->UE, receives/transmit the chain of command information with core net by CCN.

Embodiment 4

The present embodiment be given in CoMP UE set up RRC connect after, be the embodiment that CoMP UE sets up the user face downstream data paths of the serving BS-CoMP UE of SGW-CCN-CoMP UE by route diversion mode.

Mode one

After CoMP UE sets up RRC connection, when the serving BS of CoMP UE determines that triggering CoMP UE carries out cooperative multipoint transmission, carry out user face downstream data paths by path handoff procedure notice MME and switch; MME is according to notice, and change user face downstream data paths is the serving BS of SGW-CCN-CoMP UE.

Particularly, in cell switch process, (this mark is by ECGI corresponding to CCN for the Target Cell Identifier that notifies in the path switch request process that MME triggers according to handover-target base station, replace the ECGI that the handover-target base station of CoMP UE is corresponding), creating the S1-U connection setting up the handover-target base station of SGW-CCN-CoMP UE in the processes such as session request create session request.Or MME comprises the cooperation set of the serving BS of CoMP UE and the mapping relations of CCN according to what store, in the processes such as establishment session request create session request, by ECGI corresponding for CCN, replace ECGI corresponding to the serving BS of CoMP UE and inform SGW, the same existing protocol of follow-up implementation, and then the S1-U of the serving BS setting up SGW-CCN-CoMP UE connects.In addition, MME can also select chain of command data path to be switched to MME<->CCN<-Great T.GreaT.GT serving BS <->UE, or selects S1-MME to be still retained between eNB and MME.

The serving BS of CoMP UE determines that triggering CoMP UE carries out cooperative multipoint transmission, the following either type of concrete employing:

1) serving BS of CoMP UE reports according to the measurement of CoMP UE, determines whether that triggering CoMP UE carries out cooperative multipoint transmission;

Suppose that CoMP UE is by serving BS initial access network.After CoMP UE access network, serving BS configuration UE is measured, when serving BS according to the measurement of UE report judge that UE needs to carry out cooperative multipoint transmission time, trigger the Path Switch Request process between MME, it is CCN that notice MME changes transmission path endpoint.

2) serving BS of CoMP UE is according to the positional information of CoMP UE, determines whether that triggering CoMP UE carries out cooperative multipoint transmission;

When serving BS as CoMP UE determines that CoMP UE is in cooperation cell overlapping region, trigger CoMP UE and carry out cooperative multipoint transmission.

3) trigger CoMP UE by CCN and perform cooperative multipoint transmission, when the triggering CoMP UE sent carries out cooperative multipoint transmission notice, determine that triggering CoMP UE carries out cooperative multipoint transmission when the serving BS of CoMP UE receives CCN activation.

Trigger the notice that CoMP UE carries out cooperative multipoint transmission, the information such as the notified rear mutual CSI of serving BS of CoMP UE as sent to the serving BS of CoMP UE when CCN activates, and trigger path switch request process etc.; Or

CSI, CoMP UE positional information that CCN reports according to each transfer point, judge whether that triggering CoMP UE carries out cooperative multipoint transmission, when being judged as YES, and during CCN activation, CCN sends to the serving BS of CoMP UE and triggers the notice that CoMP UE carries out cooperative multipoint transmission, triggers path switch request process etc. after the serving BS of CoMP UE receives this notice.

Preferably, CoMP UE mark and cooperative multipoint transmission request are sent to CCN by the serving BS of CoMP UE;

After CCN receives the serving BS notice of CoMP UE, feedback UE CoMP transmission response message is to the serving BS of CoMP UE, and the serving BS of CoMP UE receives the cooperative multipoint transmission response of CCN feedback.

Preferably, when the serving BS of CoMP UE or CCN determine the cooperative multipoint transmission of no longer dispatching CoMP UE, the cooperative multipoint transmission function of mutual deexcitation CoMP UE, and be the user face downstream data paths that CoMP UE sets up the serving BS-CoMP UE of SGW-CoMP UE by route diversion mode.Concrete kind, like activation, repeats no more herein.

Mode two

Particularly, MME comprises the cooperation set of the serving BS of CoMP UE and the mapping relations of CCN according to what store, in the processes such as establishment session request create session request, by ECGI corresponding for CCN, replace ECGI corresponding to the serving BS of CoMP UE and inform SGW, the same existing protocol of follow-up implementation, and then the S1-U of the serving BS setting up SGW-CCN-CoMP UE connects.In addition, MME can also select chain of command data path to be switched to MME<->CCN<-Great T.GreaT.GT serving BS <->UE, or selects S1-MME to be still retained between eNB and MME.Or (this mark is by ECGI corresponding to CCN for the Target Cell Identifier notified in the path switch request process that MME triggers according to handover-target base station, replace the ECGI that the handover-target base station of CoMP UE is corresponding), creating the S1-U connection setting up the handover-target base station of SGW-CCN-CoMP UE in the processes such as session request create session request.The same existing protocol of follow-up implementation.

Based on said process, the data transmission architecture that the embodiment of the present invention is set up is: the user plane data transfer path of CoMP UE is: S-GW<->CCN<-Grea tT.GreaT.GT serving BS <->UE; The chain of command data transfer path of CoMP UE is: MME<->CCN<-Great T.GreaT.GT serving BS <->UE, or is MME<-> serving BS <->UE; Transmitting scheduling information path between CCN and cooperation transmission point is: each cooperation transmission point of CCN-.

Embodiment 5

In the present embodiment, CCN is the serving BS of CoMP UE, and the user face downstream data paths of the serving BS-CoMP UE of the SGW-CCN-CoMP UE set up in advance, comprising:

It is stand-alone base station which is mainly applicable to CCN, and provides wide situation about covering.

Suppose that CoMP UE is by serving BS initial access network.After CoMP UE access network, serving BS configuration UE is measured, when serving BS according to the measurement of UE report judge that UE needs to carry out cooperative multipoint transmission time, trigger the handoff procedure of this UE, work under switching to CCN.Or, when serving BS also can judge that UE needs to carry out cooperative multipoint transmission according to UE positional information (as being in cooperation cell overlapping region), trigger under CoMP UE is switched to CCN and work.Or, also can trigger CoMP UE by CCN and perform cooperative multipoint transmission, when the triggering CoMP UE sent carries out cooperative multipoint transmission notice, work under switching to CCN when the former serving BS of CoMP UE receives CCN activation.

Preferably, send to the serving BS of CoMP UE when CCN activates and trigger the notice that CoMP UE carries out cooperative multipoint transmission; Or CSI, CoMP UE positional information that CCN reports according to each transfer point, determines that triggering CoMP UE carries out cooperative multipoint transmission, and when CCN activates, CCN sends to the serving BS of CoMP UE the notice that triggering CoMP UE carries out cooperative multipoint transmission.

Follow-up, when CCN or serving BS judge the cooperative multipoint transmission of no longer dispatching CoMP UE, mutual deexcitation cooperative multipoint transmission function, also can trigger handoff procedure, CoMP UE is switched to the serving BS of former CoMP UE, repeats no more herein.

After having switched, CCN is the serving BS of CoMP UE, after this carries out scheduling controlling (comprising transfer point selection, PRB resource selection), the transmission of group bag etc. by CCN to the transmission of CoMP UE.Concrete scheduled transmission method, see above-described embodiment, repeats no more here.

Along with the deployment of Home eNodeB, Microcell etc., traditional heterogeneous network only having the homogeneous network of macrocell to be progressively evolved to polytype community and to coexist.Under heterogeneous network, macro base station (Marco eNB) can provide basic covering, lower powered local node (Local eNB/Small cell) provides and covers among a small circle in macro base station coverage, as shown in Figure 10, wherein lower powered local node can be RN(Relay Node, via node), HeNB(Home eNodeB, household base station), Microcell (Pico cell) base station etc.

For center cooperative scheduling scene, if cooperative node is small-cell (as Local eNB), and CCN is for providing the wide node (as Macro eNB) covered, then the movement of UE may cause frequently switching between the cooperative node of UE under same CCN service range, increases hand off signaling expense.

The embodiment of the present invention just CoMP UE works under being switched to CCN, avoids because UE moves the frequent switching caused, thus saves signaling consumption.

Embodiment 6

Under providing the user face data path based on the serving BS of SGW-CCN-CoMP UE below, the data transmission method detailed embodiment of cooperative multipoint transmission central dispatching.

CCN dispatches CoMP UE cooperative multipoint transmission and unicast (unicast of CoMP UE and non-CoMP transmission).

This programme is applicable to all CoMP transmission technology (DPS/DPB, CS/CB, JT etc.), and the present embodiment is only with CS/CB transmission citing.

System postulation is as follows: assuming that eNB1, eNB2, eNB3 are the cooperative base station under CCN.UE1(CoMP UE, measuring assembly comprises base station 1 and base station 3), the serving BS of UE2 is eNB1, UE3(CoMP UE, measuring assembly comprises base station 2 and base station 3), the serving BS of UE4 be the serving BS of eNB2, UE5 is eNB3.What be not marked as CoMP user terminal is non-CoMP user terminal.

The all user terminals of step 1) report CSI information to its service eNB, and each base station is by the CSI information of backhaul by all UE, and the data to be transmitted amount information transmission of non-CoMP UE obtains the user face data to be transmitted of CoMP UE from SGW to CCN, CCN.

UE is to its serving base stations report CSI information (prior art); In cooperation set (namely being carried out the set of the base station composition of centralized dispatching by a CCN), the CSI of each base station reception UE reports, and transmits the channel information of each UE to CCN by backhaul.The channel information of any one UE that base station is transmitted to CCN can comprise the CSI that this UE reports, and also can comprise the CSI information statistics obtained according to the CSI of this user terminal to send up.

CCN node can be that OAM is pre-configured good, if the Macro eNB under alien frequencies scene is as CCN.After OAM selectes CCN, the each base station in this CCN management area is given by CCN node information notification, also can be that each base station in certain area is determined from main separation, as each base station selected in certain area provides the wide base station covered, or the stronger base station of scheduling/data computing capability be CCN node.

Step 2) the CSI information of all UE that CCN reports according to cooperative base station, user terminal data amount information waiting for transmission, determines schedule information, and schedule information is informed to cooperative base station.

CCN receives the channel information of each served user terminals of each cooperative base station transmission in cooperation set, according to cooperation set in all user profile, COMP UE data to be transmitted information (CCN is the transfer of data intermediate transit point of CoMP UE, CCN knows the concrete data to be transmitted information of CoMP UE), the data to be transmitted amount information of non-CoMP UE (each cooperative base station gives CCN alternately) determines the scheduling scheme of CoMP UE, when determining to dispatch CoMP UE, schedule information is notified each cooperative base station by backhaul.

Particularly, CCN selects the CoMP UE be scheduled, for the resource information (MCS, PRB number, PRB position) that the CoMP UE be scheduled distributes separately, and according to these information, MAC PDU is obtained to user face data to be transmitted group bag, for non-CoMP UE distribute use PRB resource group (be not yet assigned to surplus resources that CoMP UE uses namely, this information need not special notification to cooperative base station.Hereinafter referred to as non-CoMP resource), the message identification that concrete CoMP transmission scheme is corresponding, and the schedule information etc. such as the precoding restriction of cooperative base station, the signal of CoMP transmission and/or disturbance state.No matter CCN dispatches CoMP UE carry out unicast or cooperative multipoint transmission, concrete scheduling is performed by CCN, and scheduling resource is selected by CCN.

Especially, CCN be CoMP UE select transfer point, each CoMP UE resource (MCS, PRB position, PRB number etc.) time, these resources can in one-period effectively, also can until reschedule continuously effective next time.

Suppose that CCN is according to CSI, data to be transmitted amount information, dispatch the CS/CB transmission (concrete schedule information also comprises MCS class 6, and PRB number is 3, PRB index is 0 ~ 2, and group wraps MAC PDU1) under eNB1 for UE1, eNB3 has carried out jam avoidance; For UE3 scheduled the unicast (it be 1, PRB index is 5 that concrete schedule information also comprises MCS grade 3, PRB number, and group bag MAC PDU2) of eNB2.UE1 identifies, informs to eNB1 to the schedule information of UE1, the MAC PDU1 of UE1 by CCN, simultaneously by the disturbance state information (mark that the eNB3 of jam avoidance has been carried out in this CS/CB transmission as being expressed as) of the cooperative base station of jam avoidance, informs eNB1; CCN notifies UE3 mark, to the unicast schedule information of UE3, the MAC PDU2 of UE3 to eNB2; CCN notifies available precoding matrices set to eNB3, for avoiding the interference to UE1CS/CB transmission under eNB1.

Step 3) cooperative base station receives the schedule information of CCN notice by backhaul, and carries out the scheduled transmission of CoMP UE and non-CoMP UE according to the notice of CCN.

ENB1, eNB2, eNB3 receive the schedule information of CCN respectively by backhaul, and dispatch according to schedule information.

The MAC PDU1 of this UE that the UE mark that eNB1 notifies according to CCN, UE schedule information, CCN are mutual, determine dispatched users UE1CS/CB transmission and corresponding scheduling resource information, generate PDSCH resource mapping information, PDSCH utilizes CoMP resource transmission MAC PDU1; Determine that eNB3 is jam avoidance base station according to eNB mark in disturbance state information, calculate the information such as the pre-coding matrix of this transmission according to the CSI information that UE1 reports recently; Meanwhile, eNB1 generates the NDI information, HARQ process number, redundant version number, PDSCH resource mapping information etc. of corresponding data, generates the CS/CB transmission that PDCCH dispatches UE1.Be in PRB resource except 0 ~ 2 except PRB index, the CSI information that eNB1 can report recently according to UE2, dispatches UE2 voluntarily and carries out non-CoMP transmission.The MAC PDU2 of the UE3 that the UE mark that eNB2 notifies according to CCN, UE schedule information, CCN are mutual, determine scheduling UE3 unicast and scheduling resource information, generate PDSCH resource mapping information, according to the CSI that UE3 reports recently, calculate the information such as the pre-coding matrix of this transmission; ENB2 generates the NDI information, HARQ process number, redundant version number, PDSCH resource mapping information etc. of corresponding MAC PDU2, generates PDCCH.The CSI that eNB2 reports recently according to UE4, selects the non-CoMP transmission scheduling of UE4.The CSI that eNB3 reports recently according to UE5 dispatches, and does not use the pre-coding matrix outside available precoding matrices set to dispatch the non-CoMP transmission of UE5.

Step 4) UE ACK/NACK feeds back and retransmits.

ACK/NACK information feed back is given respective serving BS by UE, when serving BS is determined to need to retransmit according to ACK/NACK feedback, utilizes the non-CoMP scheduling of resource CoMP UE data re-transmission of current time.Namely CCN only carries out the initial transmission scheduling of CoMP UE, is carried out the retransfer scheduling of CoMP UE by serving BS.In order to reduce the impact of backhaul time delay for retransfer scheduling, if the serving BS of the non-CoMP of initial transmission node of CCN selection, CCN, when notifying the MAC PDU of cooperation point initial transmission, needs the serving BS this MAC PDU being transferred to this UE simultaneously.

Especially, if CCN dispatches CoMP UE carries out new data transmission synchronization at serving BS, serving BS dispatches the re-transmission of this UE, then require that UE has two HARQ processes (HARQ process is expanded, and increases the HARQ process number of the corresponding community of UE) in the same subframe of Serving cell.

In addition, the transfer of data that whether serving BS also can scheduled this CoMP UE at possible retransmission time according to CCN determines whether carrying out the retransfer scheduling of this UE.

Or the transfer point of restriction CCN is selected, namely limit CCN at possible CoMP UE retransmission time, do not dispatch this CoMP UE, until receive serving BS, the ACK of this transfer of data is fed back.

Suppose that the TDD configuration of each cooperative base station is configuration 1, eNB1 dispatches the CS/CB data initial transmission of UE1, the non-CoMP transmission of UE2 in radio frames 1 subframe 0, eNB2 dispatches the unicast of UE3, the non-CoMP transmission of UE4 in subframe 0, eNB3 dispatches the non-CoMP transmission of UE5 in subframe 0, A/N is fed back to serving BS at subframe 7UE, and UE1 feeds back NACK to eNB1, UE4 feedback NACK to eNB2, other UE feeding back ACKs give respective serving BS.Then, eNB1 in the subframe 1 of radio frames 2, can use the re-transmission of the non-CoMP scheduling of resource UE1 in this moment (according to non-CoMP UE Schedule retransmission) the earliest, and eNB2 in the subframe 1 of radio frames 2, can use the re-transmission of the non-CoMP scheduling of resource UE4 in this moment.Further, new data transmission and re-transmission is carried out in order to avoid CCN and eNB1 all dispatches UE1 in the subframe 1 of radio frames 2, eNB1 can select to dispatch at CCN other available downlink resources that UE1 carries out outside new data transmission, as the subframe 4/5/6 etc. of radio frames 2, carries out the retransfer scheduling of UE1.

Embodiment 7

Under the present embodiment provides the user face data path based on the serving BS of SGW-CCN-CoMP UE, the data transmission method detailed embodiment of cooperative multipoint transmission central dispatching.

CCN dispatches CoMP UE cooperative multipoint transmission, dispatches CoMP UE unicast (unicast of CoMP UE and non-CoMP transmission) by the serving BS of CoMP UE.

System postulation, with embodiment 6, no longer repeats here.

CCN dispatches concrete scheme with embodiment 6 to the cooperative multipoint transmission of CoMP UE, but the unicast scheduling mode of CoMP UE is different from embodiment 6.Undertaken dispatching and transmitting by serving BS concerning the unicast of embodiment 7, CoMP UE.Concrete difference is as follows:

CCN is according to CSI, data to be transmitted amount information, and selection scheduling CoMP UE(is as the UE3 under eNB2) carry out unicast.While CCN notification service base station eNB 2UE3 mark, unicast scheduling instruction, a part of data to be transmitted (the data volume size notified can be estimated with maximum scheduling resource) that notice eNB2UE3 is corresponding.ENB2 knows that CCN notifies, according to information such as the up-to-date CSI reported of UE3, determines MCS, PRB position, PRB number, and group bag MAC PDU, scheduling UE3 carries out unicast.Meanwhile, the data end mark having transmitted data after group bag MAC PDU is informed CCN by eNB2.Within this period of time of delay that eNB2 feeds back data end mark, CCN does not dispatch the transfer of data of this UE3, thus prevents data receiver out of order, cannot restoring data.

The above embodiment of the present invention gives one and under imperfect backhaul scene, realize the data transmission method of cooperative multipoint transmission center cooperative scheduling between base station, reduces the impact of backhaul time delay on CoMP central dispatching.The method strengthens existing LTE-A framework, can to solve under imperfect backhaul scene by CCN as user data transmission process problem during scheduling controlling node, help network side to realize scheduling decision to CoMP user and data transmission and processing timely and accurately, reduce the impact of backhaul time delay on CoMP central dispatching.

Embodiment of the present invention CCN is the data relay point of CoMP UE and core net, and the path of the user face downlink data of CoMP UE is the serving BS-UE of SGW-CCN-CoMP UE.

In UE RRC connection establishment process, the service eNB of UE knows CoMP UE type, if support the UE of CoMP transmission, eNB according to the tenability of UE CoMP, current network to factors such as the tenability situation of CoMP and network side strategies, judging whether the RAN(Radio Access Network indicating core net this UE to connect, Radio Access Network) side user plane anchor point is CCN; Or utilize prior art that user face anchor point is based upon service eNB, can when triggering CoMP UE cooperative multipoint transmission, changing transfer of data anchor point by processes such as switching, path handover request path switch request is CCN.

Embodiment of the present invention control plane anchor point is still the service eNB of this UE; Or for reducing handover overhead, can be also MME-CCN-UE by chain of command route diversion.

The A/N feedback information of embodiment of the present invention CoMP UE terminates in base station side, and CCN does not dispatch the re-transmission of CoMP UE and processes; The embodiment of the present invention selects CoMP UE serving BS as the data retransmission scheduling transmission node of this UE.For reducing backhaul time delay to the impact retransmitted, if the cooperative base station outside CCN selection serving BS is the transfer point of CoMP UE, CCN needs when dispatching CoMP UE new data transmission, except informing to serving BS by the schedule information of CoMP UE, also need the serving BS MAC PDU of generation being sent to simultaneously this UE simultaneously.

The embodiment of the present invention can dispatch the unicast of CoMP UE and non-CoMP transmission by CCN or serving BS; When dispatching the unicast of CoMP UE by serving BS, CCN needs part data to be transmitted to inform to serving BS; The data message that serving BS notifies according to CCN, the schedule information of acquisition, carry out the unicast scheduling of CoMP UE, and after group bag MAC PDU, need will to transmit the data eNB identification notification of data to CCN.

In the embodiment of the present invention, CCN can be an independently logical functional entity, also can be arranged in base station, also can be a base station.

Based on same inventive concept, a kind of data transmission device of cooperative multipoint transmission central dispatching is additionally provided in the embodiment of the present invention, the principle of dealing with problems due to this device is similar to a kind of data transmission method of cooperative multipoint transmission central dispatching, therefore the enforcement of this device see the enforcement of method, can repeat part and repeats no more.

The center cooperative node CCN that the embodiment of the present invention provides, as shown in figure 11, comprising:

Data receipt unit 101, for obtaining the user face data to be transmitted of cooperative multipoint transmission user terminal CoMP UE from gateway SGW;

Channel information acquisition unit 102, for obtaining the channel condition information CSI of all UE and the user face data amount to be transmitted of non-CoMP UE from belonging to the same all cooperation transmission points in gathering that cooperate with CCN;

Scheduling unit 103, for according to the user face data amount to be transmitted of all UE and CSI, the cooperation transmission of dispatching with CCN point communicates, and performs the scheduled transmission of the user face data of CoMP UE.

The CCN that the embodiment of the present invention provides comprises processor and data transceiver interface on hardware, wherein:

During specific implementation, above-mentioned functions is configured in processor, realizes above-mentioned functions by processor.

The embodiment of the present invention also provides a kind of transfer point, and described transfer point is dispatched by center cooperative node CCN, as shown in figure 12, comprising:

Report unit 201, for reporting the channel condition information CSI of all UE and the user face data amount to be transmitted of non-CoMP UE that communicate with described cooperation transmission point to CCN;

Scheduled transmission unit 202, for by communicating with CCN, determine the CoMP resource that cooperative multipoint transmission user terminal CoMP UE transfer of data uses, utilize CoMP resource to perform the user face data scheduled transmission of CoMP UE, utilize non-CoMP resource to perform the user face data scheduled transmission of non-CoMP UE.

Above-mentioned transfer point can comprise base station, via node (Relay), base station wherein comprises macro base station (Macro), micro-base station (Micro), femto base station (Pico), Home eNodeB or is called femto base station (Femto) etc., and the WAP (wireless access point) (AP) of other possible employing tdd mode.

Above-mentioned transfer point comprises processor and data transceiver interface on hardware, wherein:

Described processor is configured to: report the channel condition information CSI of all UE and the user face data amount to be transmitted of non-CoMP UE that communicate with described cooperation transmission point to CCN; By communicating with CCN, determine the CoMP resource that cooperative multipoint transmission user terminal CoMP UE transfer of data uses, utilize CoMP resource to perform the user face data scheduled transmission of CoMP UE, utilize non-CoMP resource to perform the user face data scheduled transmission of non-CoMP UE;

Specific implementation, is configured in processor by above-mentioned functions, realizes above-mentioned functions by processor.

Preferably, described retransmission unit also for: to the synchronization of CoMP UE data retransmission, determine that the serving BS that CCN dispatches CoMP UE carries out new data transmission to CoMP UE, the ACK/NACK being received new data and data retransmission by two HARQ is respectively fed back.

The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.

Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.

Claims

1. a data transmission system for cooperative multipoint transmission central dispatching, is characterized in that, comprising:

The cooperate cooperation transmission point gathered same as CCN, the CSI of all UE and the user face data amount to be transmitted of non-CoMP UE under reporting described cooperation transmission point to CCN, by communicating with CCN, determine the CoMP resource that CoMP UE transfer of data uses, utilize CoMP resource to perform the user face data scheduled transmission of CoMP UE, utilize non-CoMP resource to perform the user face data scheduled transmission of non-CoMP UE.

2. be applied to a data transmission method for the cooperative multipoint transmission central dispatching of system described in claim 1, it is characterized in that, comprising:

Center cooperative node CCN obtains the user face data to be transmitted of cooperative multipoint transmission user terminal CoMP UE from gateway SGW;

3. method as claimed in claim 2, it is characterized in that, CCN communicates with the cooperation transmission point of its scheduling, performs the scheduled transmission of the user face data of CoMP UE, specifically comprises:

4. method as claimed in claim 3, is characterized in that,

When the cooperation transmission point of CoMP UE does not comprise the serving BS of CoMP UE, the schedule information generated and MAC PDU are also notified the serving BS of CoMP UE by CCN.

5. method as claimed in claim 4, is characterized in that,

6. method as claimed in claim 5, it is characterized in that, the serving BS of CoMP UE utilizes current non-CoMP scheduling of resource CoMP UE data re-transmission, specifically comprises:

7. method as claimed in claim 5, it is characterized in that, the serving BS of CoMP UE utilizes current non-CoMP scheduling of resource CoMP UE data re-transmission, specifically comprises:

8. method as claimed in claim 4, is characterized in that,

When serving BS for the CoMP UE carrying out coordinated multipoint transmission, CoMP UE is determined to need data re-transmission according to the Negative Acknowledgement NACK feedback information of CoMP UE, to CoMP UE data retransmission;

9. method as claimed in claim 2, it is characterized in that, CCN communicates with the cooperation transmission point of its scheduling, performs the scheduled transmission of the user face data of CoMP UE, specifically comprises:

10. method as claimed in claim 9, is characterized in that, CCN generates the schedule information of CoMP UE, the schedule information of the CoMP UE of generation and user face data to be transmitted is sent to the serving BS of CoMP UE, specifically comprises:

11. methods as claimed in claim 9, is characterized in that, user face data to be transmitted and non-cooperating transmission mark are sent to the serving BS of CoMP UE by CCN, specifically comprise:

12. methods as claimed in claim 2, is characterized in that,

CCN, based on the user face downstream data paths of the SGW-CCN-CoMP UE serving BS-CoMP UE set up in advance, obtains the user face data to be transmitted of CoMP UE from SGW.

13. methods as claimed in claim 12, is characterized in that, the user face downstream data paths of the serving BS-CoMP UE of the SGW-CCN-CoMP UE set up in advance, specifically comprises:

14. methods as claimed in claim 13, is characterized in that, in the Initial R RC connection establishment process of CoMP UE, set up the user face downstream data paths of the serving BS-CoMP UE of SGW-CCN-CoMP UE, specifically comprise for CoMP UE:

The serving BS of CoMP UE receives the Attach Request message of CoMP UE;

15. methods as claimed in claim 14, is characterized in that, the serving BS instruction core net of CoMP UE sets up the S1-U connection of the serving BS of SGW-CCN-CoMP UE, specifically comprises:

16. methods as claimed in claim 14, is characterized in that, the serving BS instruction core net of CoMP UE sets up the S1-U connection of the serving BS of SGW-CCN-CoMP UE, specifically comprises:

17. methods as claimed in claim 16, is characterized in that, also comprise:

18. methods as claimed in claim 12, is characterized in that, in the Initial R RC connection establishment process of CoMP UE, set up the user face downstream data paths of the serving BS-CoMP UE of SGW-CCN-CoMP UE, specifically comprise for CoMP UE:

The serving BS of CoMP UE receives the Attach Request message of CoMP UE;

19. methods as claimed in claim 18, is characterized in that, also comprise:

20. methods as described in claim 16 or 18, is characterized in that, also comprise:

21. methods as claimed in claim 12, is characterized in that, after CoMP UE sets up RRC connection, be the user face downstream data paths that CoMP UE sets up the serving BS-CoMP UE of SGW-CCN-CoMP UE, specifically comprise by route diversion mode:

22. methods as claimed in claim 21, is characterized in that, also comprise:

23. methods as claimed in claim 21, is characterized in that, the serving BS of CoMP UE determines that triggering CoMP UE carries out cooperative multipoint transmission, specifically comprises:

24. methods as claimed in claim 23, is characterized in that,

Send to the serving BS of CoMP UE when CCN activates and trigger the notice that CoMP UE carries out cooperative multipoint transmission; Or

25. methods as described in claim 23 or 24, is characterized in that,

When the serving BS of CoMP UE or CCN determine the cooperative multipoint transmission of no longer dispatching CoMP UE, the cooperative multipoint transmission function of mutual deexcitation CoMP UE, and be the user face downstream data paths that CoMP UE sets up the serving BS-CoMP UE of SGW-CoMP UE by route diversion mode.

26. methods as claimed in claim 12, is characterized in that, after CoMP UE sets up RRC connection, be the user face downstream data paths that CoMP UE sets up the serving BS-CoMP UE of SGW-CCN-CoMP UE, comprise by route diversion mode:

27. as arbitrary in claim 21 ~ 26 as described in method, it is characterized in that, when the serving BS of CoMP UE and CCN are not integrated in same node, comprise further:

28. methods as claimed in claim 2, it is characterized in that, CCN is the serving BS of CoMP UE, and the user face downstream data paths of the serving BS-CoMP UE of the SGW-CCN-CoMP UE set up in advance, specifically comprises:

29. methods as claimed in claim 28, is characterized in that,

The former serving BS of CoMP UE reports according to the measurement of CoMP UE, determines whether that triggering CoMP UE carries out cooperative multipoint transmission; Or

30. methods as claimed in claim 29, is characterized in that,

The data transmission method of 31. 1 kinds of cooperative multipoint transmission central dispatchings, is characterized in that, comprising:

32. methods as claimed in claim 31, is characterized in that, cooperation transmission point utilizes CoMP resource to perform the user face data scheduled transmission of CoMP UE, specifically comprises:

33. methods as claimed in claim 31, is characterized in that, CCN dispatches CoMP UE and carries out cooperative multipoint transmission, and described cooperation transmission point is the serving BS of CoMP UE, also comprises:

34. methods as claimed in claim 33, is characterized in that, the serving BS of CoMP UE utilizes current non-CoMP scheduling of resource CoMP UE data re-transmission, specifically comprises:

35. methods as claimed in claim 33, is characterized in that, also comprise:

36. methods as claimed in claim 31, it is characterized in that, CCN dispatches CoMP UE and carries out non-cooperating multicast communication, and described cooperation transmission point is the serving BS of CoMP, cooperation transmission point utilizes CoMP resource to perform the user face data scheduled transmission of CoMP UE, specifically comprises:

37. methods as claimed in claim 31, is characterized in that, described cooperation transmission point is the serving BS of CoMP, also comprises:

The serving BS of CoMP UE receives the Attach Request message of CoMP UE;

38. methods as claimed in claim 37, is characterized in that, the serving BS instruction core net of CoMP UE sets up the S1-U connection of the serving BS of SGW-CCN-CoMP UE, specifically comprises:

39. methods as claimed in claim 31, is characterized in that, described cooperation transmission point is the serving BS of CoMP, also comprises:

40. methods as claimed in claim 39, is characterized in that, also comprise:

41. methods as claimed in claim 39, is characterized in that, the serving BS of CoMP UE determines that triggering CoMP UE carries out cooperative multipoint transmission, specifically comprises:

42. as arbitrary in claim 37 ~ 41 as described in method, it is characterized in that, when the serving BS of CoMP UE and CCN are not integrated in same node, comprise further:

43. 1 kinds of center cooperative node CCN, is characterized in that, comprising:

44. CCN as claimed in claim 43, is characterized in that, the cooperation transmission point that scheduling unit and CCN dispatch communicates, and perform the scheduled transmission of the user face data of CoMP UE, specifically comprise:

45. CCN as claimed in claim 44, is characterized in that, when the cooperation transmission point of CoMP UE does not comprise the serving BS of CoMP UE, the schedule information generated and MAC PDU are also notified the serving BS of CoMP UE by scheduling unit.

46. CCN as claimed in claim 45, is characterized in that,

Scheduling unit is when the serving BS scheduling CoMP UE data re-transmission of possible CoMP UE, and the serving BS not dispatching CoMP UE carries out new data transmission to CoMP UE; Or

47. CCN as claimed in claim 43, is characterized in that, the cooperation transmission point that scheduling unit and CCN dispatch communicates, and perform the scheduled transmission of the user face data of CoMP UE, specifically comprise:

48. CCN as claimed in claim 47, is characterized in that, scheduling unit generates the schedule information of CoMP UE, the schedule information of the CoMP UE of generation and user face data to be transmitted is sent to the serving BS of CoMP UE, specifically comprises:

49. CCN as claimed in claim 47, is characterized in that, user face data to be transmitted and non-cooperating transmission mark are sent to the serving BS of CoMP UE by scheduling unit, specifically comprise:

50. CCN as claimed in claim 43, is characterized in that, data receipt unit, based on the user face downstream data paths of the SGW-CCN-CoMP UE serving BS-CoMP UE set up in advance, obtains the user face data to be transmitted of CoMP UE from SGW.

51. CCN as claimed in claim 50, is characterized in that, also comprise:

Attachment message reception units, the relevant information of the Attach Request message that the serving BS for receiving CoMP UE sends and CoMP UE;

52. CCN as claimed in claim 50, is characterized in that, also comprise:

Notification unit, triggers for sending to the serving BS of CoMP UE when CCN activates the notice that CoMP UE carries out cooperative multipoint transmission; Or according to CSI, CoMP UE positional information that each cooperation transmission point reports, determine that triggering CoMP UE carries out cooperative multipoint transmission, and when CCN activates, the serving BS to CoMP UE sends and triggers the notice that CoMP UE carries out cooperative multipoint transmission.

53. 1 kinds of cooperation transmission points, described cooperation transmission Dian You center cooperative node CCN dispatches, and it is characterized in that, comprising:

54. cooperation transmission points as claimed in claim 53, is characterized in that, scheduled transmission unit utilizes CoMP resource to perform the user face data scheduled transmission of CoMP UE, specifically comprises:

55. cooperation transmission points as claimed in claim 53, is characterized in that, CCN dispatches CoMP UE and carries out cooperative multipoint transmission, and described transfer point is the serving BS of CoMP UE, also comprises:

56. cooperation transmission points as claimed in claim 55, is characterized in that, retransmission unit utilizes current non-CoMP scheduling of resource CoMP UE data re-transmission, specifically comprises:

57. cooperation transmission points as claimed in claim 55, is characterized in that, described retransmission unit also for:

58. cooperation transmission points as claimed in claim 53, it is characterized in that, CCN dispatches CoMP UE and carries out non-cooperating multicast communication, and described transfer point is the serving BS of CoMP, scheduled transmission unit utilizes CoMP resource to perform the user face data scheduled transmission of CoMP UE, specifically comprises:

59. cooperation transmission points as claimed in claim 53, is characterized in that, described cooperation transmission point is the serving BS of CoMP, also comprises:

60. cooperation transmission points as claimed in claim 59, is characterized in that, the S1-U that indicating member instruction core net sets up the serving BS of SGW-CCN-CoMP UE connects, and specifically comprises:

61. cooperation transmission points as claimed in claim 53, is characterized in that, described cooperation transmission point is the serving BS of CoMP, also comprises:

62. cooperation transmission points as claimed in claim 53, is characterized in that, described cooperation transmission point is the serving BS of CoMP, also comprises:

63. cooperation transmission points as claimed in claim 61, is characterized in that, change indicating member determines that triggering CoMP UE carries out cooperative multipoint transmission, specifically comprises:

64. as arbitrary in claim 57 ~ 63 as described in cooperation transmission point, it is characterized in that, when the serving BS of CoMP UE and CCN are not integrated in same node, comprise further: