WO2015003612A1

WO2015003612A1 - Method, device, and system for transmission of data scheduled by coordinated multipoint transmission center

Info

Publication number: WO2015003612A1
Application number: PCT/CN2014/081821
Authority: WO
Inventors: 付喆; 倪浩; 胡海静
Original assignee: 电信科学技术研究院
Priority date: 2013-07-09
Filing date: 2014-07-08
Publication date: 2015-01-15
Also published as: CN104284438A; CN104284438B

Abstract

Provided are a method, device, and system for transmission of data scheduled by a coordinated multipoint transmission center. A CCN acquires CSI of all UE and the volume of to-be-transmitted user plane data from all coordinated transmission points, communicates with a CCN-scheduled coordinated transmission point on the basis of the CSI of all of the UE and the volume of the to-be-transmitted user plane data, and executes scheduling and transmission of the user plane data of a CoMP UE. The coordinated transmission point, by communicating with the CCN, determines a CoMP resource for use in transmission of the data of the CoMP UE, utilizes the CoMP resource to execute scheduling and transmission of the user plane data of the CoMP UE, and utilizes a non-CoMP resource to execute scheduling and transmission of user plane data of a non-CoMP UE. The present invention solves the problem with processing of user data transmission when the CCN serves as a scheduling control node in a non-ideal backhaul scenario.

Description

Data transmission method, device and system for cooperative multi-point transmission center scheduling, the present application claims to be submitted to the Chinese Patent Office on July 9, 2013, the application number is 201310286890.2, and the invention name is "a coordinated multi-point transmission center scheduling data. The priority of the Chinese Patent Application for Transmission Method and Apparatus and System, the entire contents of which is incorporated herein by reference.

Technical field

The present invention relates to the field of wireless communication technologies, and in particular, to a data transmission method, apparatus, and system for coordinated multi-point transmission center scheduling.

Background technique

Coordinated Multiple Points Transmission/Reception (CoMP) refers to multiple transmission points (TPs) separated geographically and cooperatively participates in data transmission for one terminal (Physical Downlink Shared Channel (Physical Downlink) Shared Channel, PDSCH) or jointly receive data transmitted by one terminal (Physical Uplink Shared Channel (PUSCH) transmission).

Generally, multiple transmission points may be base stations of different cells, or may be multiple remote radio heads (RRHs) in the same control cell. Through cooperative scheduling, precoding, and joint transmission between multiple transmission points, the interference between the coordinated transmission points can be effectively reduced, and the throughput of the users in the coverage area of the collaboration area, especially the collaboration point covering edge users, is improved.

The cooperative multi-point transmission technology can be divided into downlink coordinated multi-point transmission and uplink joint reception.

Downlink cooperative multi-point transmission is mainly divided into two transmission schemes: coordinated scheduling/coordinated beamforming (CS/CB) and joint processing (JP) scheme.

One of the multiple transmission points in the CS/CB transmission transmits a useful signal to the user terminal, and the other transmission points minimize the interference to the user terminal through joint scheduling and beamforming.

The joint processing scheme can be divided into joint transmission (JT) and dynamic point selection (DPS). In the JT transmission, multiple transmission points simultaneously transmit useful signals to the same user terminal, thereby enhancing the reception signal of the user terminal. The DPS transmission dynamically switches the transmission point of the user terminal, and always selects the point transmission signal optimal for the user terminal from the coordinated transmission point.

These collaborative multipoint transmission schemes can be used in conjunction with each other. It can also be combined with a dynamic point blanking (DPB) scheme to dynamically set certain transmission points on certain time-frequency resources without transmitting signals. The uplink CoMP is relatively simpler than the downlink CoMP, and the uplink cooperation mode mainly includes joint reception and cooperative scheduling. In the joint reception, signals of the same UE received by multiple receiving points are jointly processed to obtain an output signal. During cooperative scheduling, the base station side schedules the UE by considering multiple receiving points in the coordinated area to minimize the interference.

Two modes can be used for coordinated multi-point scheduling transmission between transmission nodes in a small area: 1) non-central cooperative scheduling; 2) central cooperative scheduling.

Non-central scheduling has no central node for global optimization scheduling. In order to achieve near-global optimization results, it may be necessary to use the iterative scheduling method between base stations. The cooperative base stations may need to perform multiple scheduling information interactions, as shown in Figure 1. If the backhaul delay between the base stations is large, the non-central scheduling performs multiple scheduling information interactions, which will cause the scheduling delay to be too large, resulting in outdated channel information, thus affecting the transmission performance.

In the central cooperative scheduling scenario, each cooperative base station transmits the recently received channel state information (CSI) information of the user terminal accessing the base station to a central coordination node (CCN). The CCN centrally schedules the time domain and the frequency domain resources for the user terminals of all the cooperative base stations, and the relevant base station transmits the data for the user terminal according to the resource scheduling information and the precoding result sent by the CCN, as shown in FIG. 2 .

In the LTE/LTE-A system, information exchange between base stations is implemented by a backhaul (backhaul). There may be multiple backhaul physical connections in the actual network. The information exchange between base stations in CoMP cooperative scheduling should consider the ideal backhaul and non-ideal backhaul. Usually non-ideal backhaul transmission delays can reach 10ms or more.

The Rel-12 CoMP technology uses the central cooperative scheduling scheme under non-ideal backhaul links as one of the main CoMP research scenarios. In the case of non-ideal backhaul, the central cooperative scheduling scheme mainly has the following problems: The impact of backhaul delay on CoMP center scheduling.

The network architecture of the Evolved Universal Terrestrial Radio Access Network (E-UTRAN) is shown in FIG. 3, and the E-UTRAN is composed of an evolved base station eNB. The eNB completes the access network function and communicates with the user equipment (User Equipment, UE) through the air interface. There is both a control plane connection and a user plane connection between the UE and the eNB. For each UE attached to the network, it is served by a Mobility Management Entity (MME), and the MME and the eNB are connected by an S1-MME interface. The S1-MME interface is used to provide control plane services for the UE, including mobility management and bearer management functions.

The Service Gateway (S-GW) is connected to the eNB by using an S1-U interface. For each UE attached to the network, one S-GW provides services. The S1-U interface is used to provide user plane services for the UE, and the user plane data of the UE is transmitted between the S-GW and the eNB through the S1-U bearer.

For the central collaborative scheduling scenario, you need to consider the data transmission architecture of the scenario and consider scheduling for the transport architecture. Transmission problems, to help the network side to timely and accurately implement scheduling decisions and data transmission processing for CoMP users, and reduce the impact of backhaul delay on CoMP center scheduling, but no related solutions have been provided yet.

SUMMARY OF THE INVENTION The present invention provides a data transmission method, apparatus, and system for coordinated multi-point transmission center scheduling, and a data transmission method for cooperative coordinated multi-point transmission center cooperative scheduling, which helps the network side to timely and accurately implement scheduling decisions and data for CoMP UEs. Transmission processing reduces the impact of backhaul delay on CoMP center scheduling.

The present invention provides a data transmission system for coordinated multi-point transmission center scheduling, including:

Serving gateway SGW, transmitting the user plane data of the CoMP UE to be transmitted to the serving base station of the CoMP UE;

The central cooperation point CCN acquires channel state information CSI and user plane data amount of all UEs from the coordinated transmission point belonging to the same cooperation set as the CCN, and cooperates with the CCN scheduling according to the CSI of all UEs and the amount of user plane data to be transmitted. Transmission point communication, performing scheduled transmission of user plane data of the CoMP UE;

a coordinated transmission point belonging to the same cooperative set as the CCN, and the CSI of the UE and the amount of the user plane data to be transmitted under the coordinated transmission point on the CCN, and the CoMP resource used for the CoMP UE data transmission is determined by using the CCN to communicate with the CCN. The CoMP resource performs the user plane data scheduling transmission of the CoMP UE, and performs the user plane data scheduling transmission of the non-CoMP UE by using the non-CoMP resource, where the coordinated transmission point is the serving base station of the non-CoMP UE, and is obtained from the serving base station of the CoMP UE. User plane data of the CoMP UE to be transmitted.

In this way, the method enhances the existing LTE-A architecture, and can solve the problem of user data transmission and processing when the CCN is used as the scheduling control node in the non-ideal backhaul scenario, and helps the network side to timely and accurately implement the scheduling of CoMP users. Decision and data transmission processing reduces the impact of backhaul delay on CoMP center scheduling.

The present invention also provides another data transmission system for coordinated multi-point transmission center scheduling, including:

a serving gateway SGW, a coordinated transmission point for performing data transmission to the coordinated cooperative multi-point transmission user terminal CoMP UE, and transmitting the user plane data of the CoMP UE to be transmitted;

a coordinated transmission point that belongs to the same cooperative set as the CCN, and the CSI of all UEs and the amount of user plane data to be transmitted are transmitted to the CCN, and the user plane data of the CoMP UE to be transmitted is obtained from the SGW, and communicates with the CCN. The CoMP resource used for data transmission of the CoMP UE is determined, the user plane data scheduling transmission of the CoMP UE is performed by using the CoMP resource, and the user plane data scheduling transmission of the non-CoMP UE is performed by using the non-CoMP resource.

In this way, the method enhances the existing LTE-A architecture and can be solved by CCN in a non-ideal backhaul scenario. As a user data transmission processing problem when scheduling control nodes, the network side helps the scheduling and data transmission processing of CoMP users in time and accurately, and reduces the impact of backhaul delay on CoMP center scheduling.

The above two systems give the data transmission architecture of the data transmission system scheduled by the coordinated multi-point transmission center, and the data plane transmission architecture is SGW-cooperative transmission point-CoMP UE. In the first possible implementation manner, any coordinated transmission point The user plane data can be obtained directly from the SGW. In the second possible implementation manner, the user plane data is directly obtained from the SGW for the serving base station of the CoMP UE, and the user plane data is obtained from the serving base station of the CoMP UE for other coordinated transmission points. . The control plane data transmission path is the same as the prior art, that is, the serving base station of the MME-CoMP UE - CoMP UE. Under the above data transmission architecture, the CCN performs the scheduling control function of the CoMP UE, thereby solving the problem of user data transmission processing when the CCN is used as the scheduling control node in the non-ideal backhaul scene.

The present invention also provides a data transmission method for cooperative multi-point transmission center scheduling applied to any of the above systems, including:

The central cooperative node CCN acquires channel state information CSI of all UEs and the amount of user plane data to be transmitted from the coordinated transmission point belonging to the same cooperative set as the CCN;

The CCN communicates with the CCN-scheduled coordinated transmission point according to the CSI of all UEs and the amount of user plane data to be transmitted, and performs coordinated transmission of the user plane data of the coordinated multi-point transmission user terminal CoMP UE.

The CCN cooperates with the coordinated transmission point to perform the scheduling control function of the CoMP UE, which can solve the data transmission problem of the CoMP UE.

In conjunction with the first possible implementation manner of the foregoing method, the CCN communicates with the scheduled coordinated transmission point, and performs scheduling transmission of the user plane data of the CoMP UE, including:

The CSI of all UEs of the CCN and the amount of user plane data to be transmitted are determined, and when the CoMP UE performs coordinated multi-point transmission, the coordinated transmission point of the CoMP UE is selected, and scheduling information of the CoMP UE is generated;

The CCN notifies the CoMP UE of the coordinated transmission point of the generated scheduling information. In this manner, the CCN performs scheduling control of the CoMP UE, and the coordinated transmission point participating in the CoMP UE data transmission performs the scheduled transmission of the CoMP UE according to the indication of the CCN.

In the first possible implementation manner of the foregoing method, when the coordinated transmission point of the CoMP UE does not include the serving base station of the CoMP UE, the CCN also notifies the serving base station of the CoMP UE of the generated scheduling information, so as to support the processing of the retransmitted data. .

In the first possible implementation manner of the foregoing method, for a CoMP UE that performs coordinated multi-point transmission, the serving base station of the CoMP UE determines, according to the negative acknowledgement NACK feedback information of the CoMP UE, that data retransmission is required, and determines according to the scheduling information of the CCN. CoMP resources, and use the current non-CoMP resources to schedule CoMP UE data retransmission, Thereby, the processing of retransmitted data can be solved.

In the first possible implementation manner of the foregoing method, the serving base station of the CoMP UE uses the current non-CoMP resource to schedule CoMP UE data retransmission, which specifically includes:

The serving base station of the CoMP UE uses the CCN to schedule the time when the serving base station of the CoMP UE performs new data transmission to the CoMP UE, and schedules CoMP UE data retransmission to ensure that the retransmission data is scheduled to be retransmitted using different time domain resources, so that resource conflict does not occur. .

In combination with the first possible implementation manner of the foregoing method, corresponding measures are taken on the CCN side to prevent new data from colliding with resources of retransmitted data, and the serving base station of the CoMP UE uses the current non-CoMP resource to schedule CoMP UE data. Pass, specifically including:

The CCN does not schedule the serving base station of the CoMP UE to perform new data transmission to the CoMP UE at the time when the serving base station of the possible CoMP UE schedules the CoMP UE data retransmission;

Before the CCN receives the ACK feedback from the serving base station of the CoMP UE to the retransmitted data, the serving base station that does not schedule the CoMP UE performs new data transmission to the CoMP UE.

In a first possible implementation manner of the foregoing method, for a CoMP UE that performs coordinated multi-point transmission, the serving base station of the CoMP UE retransmits data to the CoMP UE when determining that data retransmission is required according to the negative acknowledgement NACK feedback information of the CoMP UE. ;

If the serving base station of the CoMP UE schedules a new data transmission to the CoMP UE to the CoMP UE, the serving base station of the CoMP UE receives the new data and retransmits the data respectively through the two HARQs. ACK/NACK feedback. In this way, if the same time domain resources are used, in order to distinguish different information feedback, two HARQs are used.

In a second possible implementation manner of the foregoing method, the CCN communicates with the scheduled coordinated transmission point, and performs scheduling transmission of the user plane data of the CoMP UE, including:

Based on the CSI of all UEs and the amount of user plane data to be transmitted, the CCN determines that the CoMP UE performs non-multipoint coordinated transmission:

The CCN generates scheduling information of the CoMP UE, and sends the generated scheduling information to the serving base station of the CoMP UE; or

The CCN sends the non-cooperative transmission identifier to the serving base station of the CoMP UE;

The CCN does not send any relevant information of the CoMP UE to the serving base station of the CoMP UE.

In combination with the first possible implementation manner of the foregoing method, the method is applied to the foregoing second system, and further includes:

When selecting the coordinated transmission point of the CoMP UE, the CCN notifies the selected coordinated transmission point to the SGW, so that the SGW sends the user plane data of the CoMP UE to be transmitted to the selected coordinated transmission point. Therefore, the SGW performs path change, and supports the coordinated transmission point to acquire user plane data from the SGW.

In combination with the first possible implementation manner of the foregoing method, the method is applied to the foregoing first system, and further includes: The serving base station of the CoMP UE determines other coordinated transmission points for data transmission with the CoMP UE according to the scheduling information notified by the CCN;

The serving base station of the CoMP UE generates a MAC PDU according to the scheduling information and the user plane data to be transmitted of the CoMP UE received from the SGW;

The serving base station of the CoMP UE transmits the generated MAC PDU to other cooperative transmission points for data transmission with the CoMP UE.

From the CCN side, the present invention also provides a data transmission method for coordinated multi-point transmission center scheduling applied to any of the above systems, including:

The coordinated transmission point to the CCN and the channel state information CSI of all UEs under the coordinated transmission point and the amount of user data to be transmitted;

The coordinated transmission point acquires the user plane data of the CoMP UE to be transmitted from the SGW or from the serving base station of the coordinated multipoint transmission user terminal CoMP UE;

The coordinated transmission point determines the CoMP resource used by the CoMP UE data transmission by communicating with the CCN, performs the user plane data scheduling transmission of the CoMP UE by using the CoMP resource, and performs the non-CoMP UE user plane data scheduling transmission by using the non-CoMP resource.

If the coordinated transmission point is a serving base station of the CoMP UE, the user plane data to be transmitted of the CoMP UE may be obtained from the SGW directly.

In conjunction with the first possible implementation manner of the foregoing method, the coordinated transmission point performs the user plane data scheduling transmission of the CoMP UE by using the CoMP resource, and specifically includes:

Receiving, by the CCN, the scheduling information of the CoMP UE that is sent when the CoMP UE performs the coordinated multi-point transmission; determining the CoMP resource used by the CoMP UE data transmission according to the scheduling information, and generating the medium access control protocol data unit MAC according to the scheduling information and the user plane data to be transmitted. PDU;

CoMP resource transmission on the physical downlink shared channel PDSCH MAC PDIL

In a first possible implementation manner of the foregoing method, the CCN scheduling CoMP UE performs coordinated multi-point transmission, where the coordinated transmission point is a serving base station of the CoMP UE, and the method further includes:

The serving base station of the CoMP UE determines that data retransmission is required according to the negative acknowledgement NACK feedback information of the CoMP UE, and schedules CoMP UE data retransmission using the current non-CoMP resource.

The data retransmission process is performed by the serving base station of the CoMP UE to avoid data confusion caused by CCN processing. In the first possible implementation manner of the foregoing method, the serving base station of the CoMP UE uses the current non-CoMP resource to schedule CoMP UE data retransmission, which specifically includes: The serving base station of the CoMP UE schedules CoMP UE data retransmission using the CCN to schedule the time when the serving base station of the CoMP UE performs new data transmission to the CoMP UE.

In combination with the first possible implementation manner of the foregoing method, the method further includes: if the serving base station of the CoMP UE retransmits the data to the CoMP UE, determining that the serving base station of the CCN scheduling CoMP UE performs new data transmission to the CoMP UE, the CoMP UE The serving base station receives ACK/NACK feedback of new data and retransmitted data respectively through two HARQs.

In a second possible implementation manner of the foregoing method, the CCN schedules the CoMP UE to perform non-coordinated multipoint transmission, where the coordinated transmission point is a serving base station of the CoMP, and the coordinated transmission point performs the user plane data scheduling transmission of the CoMP UE by using the CoMP resource. Specifically, including:

Receiving the scheduling information of the CoMP UE sent by the CCN, determining the CoMP resource used by the CoMP UE data transmission according to the scheduling information, generating a MAC PDU according to the scheduling information and the user plane data to be transmitted, and transmitting the MAC PDU by using the CoMP resource on the PDSCH; or

When receiving the non-cooperative transmission identifier sent by the CCN or not receiving any related information of the CoMP UE, determining that the CoMP UE performs non-CoMP transmission, and determining that the CoMP UE performs non-CoMP transmission from resources other than the CoMP resource determined by the CCN scheduling information. The used CoMP resource generates a MAC PDU according to the determined CoMP resource, and transmits the MAC PDU on the PDSCH by using the determined CoMP resource.

In a second possible implementation manner of the foregoing method, the CCN scheduling CoMP UE performs coordinated multi-point transmission, where the coordinated transmission point is a serving base station of the CoMP UE, and the method further includes:

The serving base station of the CoMP UE determines other coordinated transmission points for data transmission with the CoMP UE according to the scheduling information notified by the CCN;

Preferably, the amount of the user plane data to be transmitted of all the UEs in the coordinated transmission point to the CCN and the coordinated transmission point includes:

The coordinated transmission point transmits the amount of user plane data to be transmitted to all the UEs under the coordinated transmission point to the CCN through dynamic mode, semi-static mode or event triggering mode.

The invention also provides a collaboration center node CCN, comprising:

An information acquiring unit, configured to acquire channel state information CSI of all UEs and a user plane data amount to be transmitted from a coordinated transmission point that belongs to the same cooperation set as the CCN;

The scheduling transmission unit is configured to communicate with the CCN scheduled coordinated transmission point according to the CSI of all UEs and the amount of user plane data to be transmitted, and perform coordinated transmission of the user plane data of the coordinated multipoint transmission user terminal CoMP UE.

Preferably, the scheduling transmission unit communicates with the scheduled coordinated transmission point, and performs scheduling transmission of the user plane data of the CoMP UE, including:

Determining, according to the CSI of all UEs and the amount of user plane data to be transmitted, the CoMP UE to perform coordinated multi-point transmission, selecting a coordinated transmission point of the CoMP UE, and generating scheduling information of the CoMP UE;

The generated scheduling information will be notified to the CoMP UE's coordinated transmission point.

Preferably, when the coordinated transmission point of the CoMP UE does not include the serving base station of the CoMP UE, the scheduling transmission unit further notifies the generated base station of the CoMP UE.

Preferably, the scheduling transmission unit does not schedule the serving base station of the CoMP UE to perform new data transmission to the CoMP UE at a time when the serving base station of the possible CoMP UE schedules CoMP UE data retransmission; or

Before the scheduling transmission unit receives the ACK feedback from the serving base station of the CoMP UE to the retransmission data, the serving base station that does not schedule the CoMP UE performs new data transmission to the CoMP UE.

Preferably, the scheduling transmission unit communicates with the scheduled coordinated transmission point, and performs scheduling transmission of the user plane data of the CoMP UE, specifically:

According to the CSI of all UEs and the amount of user plane data to be transmitted, when the CoMP UE performs non-multipoint coordinated transmission, then:

Generating scheduling information of the CoMP UE, and transmitting the generated scheduling information to the serving base station of the CoMP UE; or transmitting the non-cooperative transmission identifier to the serving base station of the CoMP UE;

No relevant information of the CoMP UE is sent to the serving base station of the CoMP UE.

Preferably, the method further comprises:

And a notification unit, configured to notify the selected coordinated transmission point to the SGW when the coordinated transmission point of the CoMP UE is selected, so that the SGW sends the user plane data of the CoMP UE to be transmitted to the selected coordinated transmission point.

The embodiment of the invention further provides a CCN, including:

a processor configured to acquire channel state information CSI of all UEs and a user plane data amount to be transmitted from a coordinated transmission point that belongs to the same cooperative set as the CCN; and schedule the CCN according to the CSI of all UEs and the amount of user plane data to be transmitted. Collaborative transmission point communication, performing coordinated multi-point transmission of user plane data of the user terminal CoMP UE; data transmission and reception interface, used for data transmission and reception between the processor and the coordinated transmission point.

Preferably, the processor communicates with the scheduled coordinated transmission point, and performs scheduling transmission of the user plane data of the CoMP UE, including: Determining, according to the CSI of all UEs and the amount of user plane data to be transmitted, the CoMP UE to perform coordinated multi-point transmission, selecting a coordinated transmission point of the CoMP UE, and generating scheduling information of the CoMP UE;

The generated scheduling information is notified to the CoMP UE's coordinated transmission point.

Preferably, when the coordinated transmission point of the CoMP UE does not include the serving base station of the CoMP UE, the processor also notifies the serving base station of the CoMP UE of the generated scheduling information.

Preferably, the processor does not schedule the serving base station of the CoMP UE to perform new data transmission to the CoMP UE at the time when the serving base station of the possible CoMP UE schedules the CoMP UE data retransmission; or

Before the processor receives the ACK feedback from the serving base station of the CoMP UE to the retransmitted data, the serving base station that does not schedule the CoMP UE performs new data transmission to the CoMP UE.

Preferably, the processor communicates with the scheduled coordinated transmission point, and performs scheduling transmission of the user plane data of the CoMP UE, specifically:

Preferably, the data transceiver interface is further configured to:

When the coordinated transmission point of the CoMP UE is selected, the selected coordinated transmission point is notified to the SGW, so that the SGW sends the user plane data of the CoMP UE to be transmitted to the selected coordinated transmission point.

The invention also provides a collaborative transmission point, comprising:

The upper unit is used to transmit channel state information CSI and the amount of user plane data to be transmitted to all UEs under the coordinated transmission point to the CCN;

a data acquiring unit, configured to acquire, from a SGW or a serving base station of the coordinated multi-point transmission user terminal CoMP UE, the user plane data of the CoMP UE to be transmitted;

The scheduling transmission unit is configured to: determine, by using the communication with the CCN, the CoMP resource used by the CoMP UE data transmission, perform the user plane data scheduling transmission of the CoMP UE by using the CoMP resource, and perform the non-CoMP UE user plane data scheduling transmission by using the non-CoMP resource.

Preferably, the scheduling transmission unit performs the user plane data scheduling transmission of the CoMP UE by using the CoMP resource, and specifically includes:

Receiving, by the CCN, scheduling information of a CoMP UE that is sent when the CoMP UE performs coordinated multi-point transmission; Determining a CoMP resource used by the CoMP UE data transmission according to the scheduling information, and generating a media access control protocol data unit MAC PDU according to the scheduling information and the user plane data to be transmitted;

Preferably, the scheduling transmission unit schedules the CoMP UE to perform coordinated multi-point transmission, where the coordinated transmission point is a serving base station of the CoMP UE, and further includes:

And a data retransmission unit, configured to determine, when the data retransmission is required according to the negative acknowledgement NACK feedback information of the CoMP UE, and schedule CoMP UE data retransmission by using the current non-CoMP resource.

Preferably, the data retransmission unit uses the current non-CoMP resource to schedule CoMP UE data retransmission, and specifically includes: scheduling, by the CCN, the serving base station of the CoMP UE to perform new data transmission to the CoMP UE, scheduling

CoMP UE data retransmission.

Preferably, the data retransmission unit is further configured to determine, at the same time that the serving base station of the CoMP UE retransmits the data to the CoMP UE, and the CCN schedules the serving base station of the CoMP UE to receive new data through the two HARQs when performing new data transmission to the CoMP UE. ACK/NACK feedback with retransmitted data.

Preferably, the CCN schedules the CoMP UE to perform the non-coordinated multipoint transmission, and the coordinated transmission point is the serving base station of the CoMP, and the scheduling transmission unit performs the user plane data scheduling transmission of the CoMP UE by using the CoMP resource, which specifically includes: receiving the CoMP UE sent by the CCN Scheduling information, determining a CoMP resource used by the CoMP UE data transmission according to the scheduling information, generating a MAC PDU according to the scheduling information and the user plane data to be transmitted, and transmitting the MAC PDU by using the CoMP resource on the PDSCH; or

Preferably, the CCN scheduling CoMP UE performs coordinated multipoint transmission, and the coordinated transmission point is a serving base station of the CoMP UE, and further includes:

a data notification unit, configured to determine, according to the scheduling information of the CCN notification, another coordinated transmission point for performing data transmission with the CoMP UE; and generate a MAC PDU according to the scheduling information and the user plane data to be transmitted of the CoMP UE received from the SGW; The PDU is sent to other coordinated transmission points for data transmission with the CoMP UE.

Preferably, the amount of the user plane data to be transmitted of all the UEs in the upper layer and the CCN on the CCN includes:

The amount of user plane data to be transmitted of all UEs in the coordinated transmission point is transmitted to the CCN in a dynamic manner, a semi-static manner, or an event triggering manner.

The embodiment of the invention further provides a collaborative transmission point, including:

a processor configured to report, to the CCN, channel state information CSI and to all UEs under the coordinated transmission point Transmitting the amount of user plane data; acquiring the user plane data of the CoMP UE to be transmitted from the SGW or the serving base station of the cooperative multipoint transmission user terminal CoMP UE; determining the CoMP resource used for the CoMP UE data transmission by communicating with the CCN, using the CoMP The resource performs the user plane data scheduling transmission of the CoMP UE, and performs non-CoMP UE user plane data scheduling transmission by using the non-CoMP resource; thus, the method enhances the existing LTE-A architecture, and can be solved in a non-ideal backhaul scenario. The user data transmission processing problem when the CCN is used as the scheduling control node helps the network side to timely and accurately implement the scheduling decision and data transmission processing for the CoMP user, and reduces the impact of the backhaul delay on the CoMP center scheduling.

The data transceiver interface is used to implement data transmission and reception between the processor and the CCN and the UE.

Preferably, the processor performs the user plane data scheduling transmission of the CoMP UE by using the CoMP resource, and the method includes: receiving, by the CCN, the scheduling information of the CoMP UE that is sent when the CoMP UE performs the coordinated multi-point transmission; determining the data transmission used by the CoMP UE according to the scheduling information. a CoMP resource, generating a media access control protocol data unit MAC PDU according to the scheduling information and the user plane data to be transmitted;

Preferably, the processor schedules the CoMP UE to perform coordinated multipoint transmission, where the coordinated transmission point is a service base station of the CoMP UE, and the data transceiver interface is further configured to:

According to the negative acknowledgement of the CoMP UE, the NACK feedback information determines that data retransmission is required, and utilizes the current non-

CoMP resource scheduling CoMP UE data retransmission.

Preferably, the data transceiving interface uses the current non-CoMP resource to schedule CoMP UE data retransmission, which specifically includes: scheduling, by the CCN, the serving base station of the CoMP UE to perform new data transmission to the CoMP UE, scheduling

CoMP UE data retransmission.

Preferably, the data transceiving interface is further configured to determine the same time when the serving base station of the CoMP UE retransmits the data to the CoMP UE, and when the serving base station of the CCN scheduling CoMP UE performs new data transmission to the CoMP UE, the new data is respectively received by the two HARQs. Retransmit ACK/NACK feedback of data.

Preferably, the CCN scheduling CoMP UE performs non-coordinated multipoint transmission, and the coordinated transmission point is a serving base station of the CoMP, and the processor performs the user plane data scheduling transmission of the CoMP UE by using the CoMP resource, which specifically includes:

Determine CoMP when receiving the non-cooperative transmission identifier sent by the CCN or not receiving any relevant information of the CoMP UE.

The UE performs non-CoMP transmission, and determines CoMP from resources other than the CoMP resource determined by the CCN scheduling information.

The UE performs a CoMP resource for non-CoMP transmission, and generates a MAC PDU according to the determined CoMP resource, where

The MAC PDU is transmitted on the PDSCH using the determined CoMP resources.

Preferably, the CCN schedules the CoMP UE to perform coordinated multipoint transmission, and the coordinated transmission point is a service of the CoMP UE. The data base transceiver is further configured to:

Determining, according to the scheduling information notified by the CCN, another coordinated transmission point for performing data transmission with the CoMP UE; generating a MAC PDU according to the scheduling information and the user plane data to be transmitted of the CoMP UE received from the SGW; and transmitting the generated MAC PDU to the CoMP UE Other collaborative transmission points for data transmission.

Preferably, the processor sends the amount of user plane data to be transmitted to all the UEs on the CCN and the coordinated transmission point, including:

The amount of user plane data to be transmitted of all UEs in the coordinated transmission point is transmitted to the CCN in a dynamic manner, a semi-static manner, or an event triggering manner. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of information interaction of a non-central scheduling;

2 is a schematic diagram of information exchange of central scheduling;

Figure 3 shows the E-UTRAN network architecture;

4 is a flowchart of a data transmission method for scheduling a CCN side coordinated multi-point transmission center according to an embodiment of the present invention; FIG. 5 is a flowchart of a data transmission method for a coordinated transmission point side coordinated multi-point transmission center scheduling according to an embodiment of the present invention; FIG. 7 is a schematic diagram of a data transmission system of a data transmission system scheduled by a coordinated multipoint transmission center according to an embodiment of the present invention; FIG.

FIG. 8 is a schematic diagram of a coordinated transmission point according to an embodiment of the present invention.

9 is a schematic diagram of a central collaboration node according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of a coordinated transmission point according to an embodiment of the present invention. The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. The embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The data transmission method, apparatus and system for cooperative multipoint transmission center scheduling provided by the present invention will be described in more detail below with reference to the accompanying drawings and embodiments.

In order to reduce the neighboring area interference of the cell coverage edge user terminal and improve the experience of the cell edge user terminal, the long term evolution-advance (LTE-A) system uses coordinated multi-point transmission technology ( coordinated-multiple- Point , CoMP ). Cooperative multipoint transmission technology is a collaboration between multiple transmission points (TPs) that are geographically separated. And globally optimized scheduling with its central node The implementation of CoMP technology is divided into non-central collaborative scheduling and central collaborative scheduling. Considering the actual network conditions, LTE-A Release 12 introduces a non-ideal backhaul CoMP scenario. In the case of non-ideal backhaul central cooperative scheduling, since the scheduling control function of the CoMP UE will be implemented by the CCN, there is a non-negligible backhaul delay between the CCN and the eNB, between the serving eNB and other e Bs (typical one-way backhaul) The delay value is 10ms. Therefore, it is necessary to consider the scheduling implementation and transmission feedback implementation problem in this scenario.

The present invention provides a data transmission method for cooperative coordinated multi-point transmission center cooperative scheduling in a non-ideal backhaul scenario between base stations, which reduces the impact of backhaul delay on CoMP center scheduling.

The embodiment of the invention provides a data transmission system for coordinated multi-point transmission center scheduling, which includes:

Sending, by the SGW, the user plane data of the CoMP UE to be transmitted to the serving base station of the CoMP UE;

The CCN obtains the CSI of all UEs and the amount of user plane data to be transmitted from the coordinated transmission point that belongs to the same cooperative set as the CCN, and communicates with the coordinated transmission point scheduled by the CCN according to the CSI of all UEs and the amount of user plane data to be transmitted, and performs CoMP Scheduling transmission of user plane data of the UE;

The data transmission architecture of the data transmission system provided by the embodiment of the present invention is: the transmission path of the user plane data is the serving base station-UE of the SGW-CoMP UE, and the other coordinated transmission points participating in the CoMP UE are obtained from the serving base station of the CoMP UE. User plane data of the CoMP UE to be transmitted. The transmission path of the control plane data may use an existing path, that is, the serving base station-UE of the MME-CoMP UE.

The above system can solve the problem of user data transmission and processing when the CCN is used as the scheduling control node in the non-ideal backhaul scenario, and helps the network side to timely and accurately implement the scheduling decision and data transmission processing for the CoMP user, and reduce the backhaul delay to the CoMP. The impact of central scheduling.

The embodiment of the present invention further provides another data transmission system for coordinated multi-point transmission center scheduling, including:

SGW, the coordinated transmission point that performs data transmission to the scheduling CoMP UE, and sends the user plane data of the CoMP UE to be transmitted;

a coordinated transmission point belonging to the same cooperative set as the CCN, to all the UEs under the coordinated transmission point on the CCN

CSI and the amount of user plane data to be transmitted, obtain the user plane data of the CoMP UE to be transmitted from the SGW, determine the CoMP resource used for the CoMP UE data transmission by communicating with the CCN, and perform the CoMP UE by using the CoMP resource. The client data is scheduled to be transmitted, and the non-CoMP UE is used to perform user plane data scheduling transmission of the non-CoMP UE.

The CoMP UE in the embodiment of the present invention refers to a CoMP-capable UE, and the CCN determines a scheduling scheme of the CoMP UE, and may schedule the CoMP UE to perform coordinated multi-point transmission, and may also schedule the CoMP UE to perform non-coordinated multi-point transmission. This embodiment is called single point transmission. The non-CoMP UEs in this embodiment refer to the UEs that do not have the CoMP capability. The CoMP resources in this embodiment refer to the resources used by the CoMP UEs for transmission, regardless of whether the CoMP UE performs coordinated multipoint transmission.

The data transmission architecture of the foregoing data transmission system provided by the embodiment of the present invention is: the transmission path of the user plane data is an SGW-transmission point-UE, that is, for all coordinated transmission points participating in the CoMP UE, the user to be transmitted of the CoMP UE is acquired from the SGW. Face data. The transmission path of the control plane data may use an existing path, that is, the serving base station-UE of the MME-CoMP UE.

In the above two systems provided by the embodiments of the present invention, when the CCN central cooperative scheduling function is activated, each coordinated transmission point scheduled by the CCN needs to transmit the CSI information of the UE and the amount of data to be transmitted to the CCN, and the CCN communicates with the coordinated transmission point. Perform scheduling control of the CoMP UE. The coordinated transmission point scheduled by the CCN, according to the communication with the CNN, determines the CoMP resource of the CoMP UE data transmission, and uses the CoMP resource to perform the user plane data scheduling transmission of the CoMP UE, and for the non-CoMP UE, the coordinated transmission point determines the transmission scheme by itself. Transfer.

Therefore, the above system can solve the problem of user data transmission and processing when the CCN is used as the scheduling control node in the non-ideal backhaul scenario, and help the network side to timely and accurately implement the scheduling decision and data transmission processing for the CoMP user, and reduce the backhaul delay. Impact on CoMP center scheduling.

A data transmission method for the coordinated multipoint transmission center scheduling applied to any of the above systems according to the embodiment of the present invention is shown below. As shown in FIG. 4, the method includes:

Step 401: The CCN acquires channel state information CSI of all UEs and a quantity of user plane data to be transmitted from a coordinated transmission point that belongs to the same collaboration set as the CCN.

Step 402: The CCN communicates with the coordinated transmission point scheduled by the CCN according to the CSI of all UEs and the amount of user plane data to be transmitted, and performs scheduling transmission of the user plane data of the CoMP UE.

The CCN can determine the scheduling scheme of the CoMP UE according to the channel state information CSI of all UEs and the amount of data to be transmitted, specifically determining whether the CoMP UE performs coordinated multi-point transmission or non-multi-point coordinated transmission and allocates corresponding CoMP resources, such as performing multiple The point-coordinate transmission, the specific multi-point coordinated transmission scheme is used. When the CoMP UE performs coordinated multi-point transmission or non-multi-point coordinated transmission, the scheduling and transmission of the user plane data of the CoMP UE are respectively implemented as follows:

1) CCN determines CoMP UE for coordinated multi-point transmission

The CCN notifies the CoMP UE of the coordinated transmission point of the generated scheduling information. The LTE MAC protocol supports the HARQ process. According to whether the retransmission has a fixed relationship with the previous transmission, it can be divided into synchronization (retransmission at a predefined time) and asynchronous HARQ (retransmission is performed at any available time after the last transmission); Modulation and coding scheme (MCS) and whether the resource location is variable, can be divided into adaptive (changing some or all of the attributes of the initial transmission, such as modulation, resource allocation, etc.) and non-adaptive HARQ.

For downlink transmission, LTE downlink supports asynchronous adaptive HARQ retransmission. For uplink transmission, LTE uplinks typically support synchronous non-adaptive HARQ retransmissions.

The following line asynchronous adaptive HARQ retransmission is taken as an example:

The delay of ACK/NACK with respect to data is a certain value, and the delay of retransmission or new data and ACK/NACK is determined by the scheduler.

The delay of the ACK/NACK with respect to the data is a determined value k, that is, if the downlink subframe transmits the PDSCH, the ACK/NACK feedback position is in the subframe +1^

In FDD mode, k=4;

In TDD mode, k is related to the uplink and downlink configuration of TDD. The k value is shown in Table 1:

Table 1 Delay between ACK/NACK feedback and downlink data transmission in TDD mode

In order to support the processing of the retransmission data, preferably, when the coordinated transmission point of the CoMP UE does not include the serving base station of the CoMP UE, the CCN also notifies the service base station of the CoMP UE of the generated scheduling information. The embodiment of the present invention uses the following processing method for retransmitting data:

For the CoMP UE performing coordinated multi-point transmission, the serving base station of the CoMP UE determines the CoMP resource according to the scheduling information of the CCN according to the negative acknowledgement NACK feedback information of the CoMP UE, and schedules the CoMP UE by using the current non-CoMP resource. Data retransmission.

The CoMP resource includes a time domain resource and a frequency domain resource. Preferably, the serving base station of the CoMP UE uses the current non-CoMP resource to schedule CoMP UE data retransmission, which specifically includes:

The serving base station of the CoMP UE uses the CCN to schedule the serving base station of the CoMP UE to perform new data transmission to the CoMP UE. At the time other than the input, the CoMP UE data retransmission is scheduled.

That is, the transmission of new data and the transmission of retransmitted data are scheduled using different time domain resources.

In order to avoid resource conflicts between the transmission of new data and the transmission of retransmitted data, the corresponding processing measures can also be performed on the CNN side:

Further preferably, for the CoMP UE performing the coordinated multi-point transmission, the serving base station of the CoMP UE retransmits the data to the CoMP UE when determining that the data retransmission is required according to the negative acknowledgement NACK feedback information of the CoMP UE; if the serving base station of the CoMP UE is to the CoMP At the same time that the UE retransmits the data, the CCN schedules the serving base station of the CoMP UE to perform new data transmission to the CoMP UE, and the serving base station of the CoMP UE receives the ACK/NACK feedback of the new data and the retransmitted data respectively through the two HARQs.

2) CCN determines CoMP UE for non-multipoint coordinated transmission

Based on the CSI of all UEs and the amount of user plane data to be transmitted, the CCN determines whether the CoMP UE performs non-multipoint coordinated transmission, and preferably uses any of the following processing methods:

In the processing mode 1, the CCN generates scheduling information of the CoMP UE, and sends the generated scheduling information to the serving base station of the CoMP UE.

In the second processing mode, the CCN sends the non-cooperative transmission identifier to the serving base station of the CoMP UE.

In the third mode, the CCN does not send any information about the CoMP UE to the serving base station of the CoMP UE. For the processing mode 2 and the processing mode 3, the serving base station of the CoMP UE determines the transmission mode of the CoMP UE. Preferably, the method is applied to the second system, and the method further includes: when selecting the coordinated transmission point of the CoMP UE, the CCN notifying the selected coordinated transmission point to the SGW, so that the SGW sends the user plane data of the CoMP UE to be transmitted to the SGW. Selected collaborative transfer point.

The following is a data transmission method for the coordinated multi-point transmission center scheduling applied to the above system from the coordinated transmission point side scheduled by the CCN, as shown in FIG. 5, including:

Step 501: The channel state information CSI and the amount of user plane data to be transmitted of all UEs in the coordinated transmission point to the CCN and the coordinated transmission point.

Step 502: The coordinated transmission point acquires, to the serving base station of the CoMP UE, the to-be-transmitted user plane data of the CoMP UE.

Step 503: The coordinated transmission point determines the CoMP resource used by the CoMP UE data transmission by communicating with the CCN, performs the user plane data scheduling transmission of the CoMP UE by using the CoMP resource, and performs the user plane data scheduling transmission of the non-CoMP UE by using the non-CoMP resource. Preferably, the coordinated transmission point performs the user plane data scheduling transmission of the CoMP UE by using the CoMP resource, and specifically includes:

The MAC PDU is transmitted using the CoMP resource on the PDSCH.

The CCN scheduling CoMP UE performs coordinated multi-point transmission, and the coordinated transmission point is a serving base station of the CoMP UE, and further includes:

Preferably, the serving base station of the CoMP UE uses the current non-CoMP resource to schedule CoMP UE data retransmission, which specifically includes:

The serving base station of the CoMP UE uses the CCN to schedule the CoMP UE to retransmit the CoMP UE data at a time other than the new data transmission by the serving base station to the CoMP UE.

Preferably, the method further includes: if the serving base station of the CoMP UE retransmits the data to the CoMP UE, determining that the serving base station of the CCN scheduling CoMP UE performs new data transmission to the CoMP UE, and the serving base station of the CoMP UE receives the new data through the two HARQs respectively. ACK/NACK feedback of data and retransmitted data.

Preferably, the CCN schedules the CoMP UE to perform non-coordinated multipoint transmission, and the coordinated transmission point is a serving base station of the CoMP, and the coordinated transmission point performs the user plane data scheduling transmission of the CoMP UE by using the CoMP resource, and specifically includes: receiving the CoMP UE sent by the CCN Scheduling information, determining a CoMP resource used by the CoMP UE data transmission according to the scheduling information, generating a MAC PDU according to the scheduling information and the user plane data to be transmitted, and transmitting the MAC PDU by using the CoMP resource on the PDSCH; or

The serving base station of the CoMP UE sends the generated MAC PDU to other protocols for data transmission with the CoMP UE. As a transmission point.

A preferred embodiment of the data transmission method and system for cooperative multi-point transmission center scheduling of the present invention is given below in conjunction with the embodiments.

Example 1

This embodiment provides a data transmission architecture in a non-ideal backhaul CoMP central scheduling scenario. As shown in FIG. 6, the data transmission path between the UE and the core network is still SGW<->serving base station<->CoMP UE (that is, the data direct connection port exists between the SGW and the serving base station of the CoMP UE). The CCN only has a scheduling control function for the CoMP UE (the CoMP UE refers to a user terminal including two or more base stations in the measurement set). The scheduling control of a non-CoMP UE (a non-CoMP UE refers to a user terminal including only one base station in a measurement set) is performed by its serving base station.

Specifically, the coordinated transmission point (usually a base station) in the same cooperative set as the CCN exchanges information such as the CSI information, the to-be-transmitted data volume information, and the CoMP UE identifier to the CCN, and the CCN selects the scheduling resource of the CoMP UE according to the information. And scheduling the CoMP UE, and the scheduling information is exchanged to the coordinated base station of the CoMP UE. The cooperative base station performs scheduling transmission of new data to the CoMP UE according to the scheduling instruction of the CCN, and performs scheduling transmission of the terminal that does not support CoMP by using the non-CoMP resource. The cooperating base station can acquire new data to be transmitted from the SGW or from the serving base station of the CoMP UE.

Preferably, the CCN node may be pre-configured by the OAM, or may be determined by each base station in a certain area, for example, each base station in a certain area selects a base station that provides wide coverage, or has strong scheduling/data computing capability. The base station is a CCN node. If the base station autonomously selects the CCN in a certain area, the CCN indicates that it has the CCN function or the centralized scheduling function when establishing an X2 connection with other cooperative base stations.

When the OCN is pre-configured, the CCN can be a base station, or it can be an independent logical function entity with strong scheduling/data processing capability deployed near the base station. After the OCN selects the CCN, the CCN node information is notified to each base station in the CCN management area. If the CCN is an independent logical function entity, the CCN should give the base station a corresponding indication when establishing a connection with the base station participating in the CoMP transmission. The indication indicates that it is only a CCN, or a CoMP function node, or cannot be used as a handover target. The entity is used to avoid switching the UE to the CCN, or is unable to implement load balancing, small-area interference management, SON, etc. as a function supported by the base station.

Preferably, the interface between the CCN and the cooperative base station may be an X2 interface, or a new interface, and an interface connection may be established when the CCN is activated.

The scheduling function of the CoMP UE managed by the CCN may be activated when the CoMP UE accesses the network, or may be determined by the serving base station or the CCN of the CoMP UE according to the information of the CoMP UE location/measured channel shield and the like. The scheduling function for the CoMP UE can also be activated after the CCN node is activated. Example 2

A preferred embodiment of CCN scheduling CoMP UE coordinated multipoint transmission and single point transmission is given below. This scheme is applicable to all CoMP transmission technologies (DPS/DPB, CS/CB, JT). This embodiment is only exemplified by CS/CB transmission.

The system assumes the following:

It is assumed that e Bl, e B2, and e B3 are cooperative base stations under the CCN. UE1 (CoMP UE, base station 1 and base station 3 in the measurement set), UE2's serving base station is eNB1, UE3 (CoMP UE, measurement set includes base station 2 and base station 3), UE4's serving base station is e B2, UE5 service The base station is e B3. Non-CoMP UEs that are not marked as CoMP UEs.

Step 1: All UEs report CSI information and data volume information to be transmitted to the serving base station, and each base station transmits CSI information and data volume information to be transmitted to the CCN through backhaul.

The UE reports the CSI information to the serving base station (the process is a prior art), and specifically: the cooperative set (ie, the set of base stations that are centrally scheduled by one CCN) receives the service user terminal CSI and reports it through the backhaul. The CCN transmits the CSI of each of its serving user terminals.

The CSI of any one of the service user terminals transmitted by the base station to the CCN may include the CSI reported by the user terminal, and may also include the CSI information statistic obtained according to the CSI of the user terminal.

Each of the cooperative base stations may notify the CCN of the data volume information to be transmitted of the user terminal in a semi-static manner, an event triggering manner, or a dynamic manner.

In the semi-static reporting mode, the cooperative base station can report the data volume to be transmitted of the CoMP UE terminal and the non-CoMP user terminal to the CCN according to a certain period (for example, 20 ms). The data to be transmitted may be the amount of data to be transmitted that is expected to be transmitted by the cooperative base station in a period of time (semi-static period), or may be the current data to be transmitted currently reported at the time of reporting.

The event triggering reporting mode or dynamic reporting mode, the cooperative base station may simultaneously report the data volume information to be transmitted when the CSI information is reported, or may trigger the information when the user data arrives and the data volume information to be transmitted is changed.

For the uplink CoMP, each base station also reports the BSR and PHR information of the UE to the CCN.

Step 2: The CCN determines the scheduling information of the CoMP UE according to the CSI information reported by each base station and the data volume information to be transmitted by the user terminal, and notifies the coordinated base station of the scheduling information of the CoMP UE.

The CCN receives channel information of each serving user terminal transmitted by each coordinated base station in the cooperation set, data amount information to be transmitted by the user terminal, etc., performs scheduling of the CoMP UE according to all user information in the cooperation set, and notifies the scheduling information by backhaul Each cooperative base station to the UE.

The specific scheduling information includes: the CCN selects the scheduled CoMP UE, and allocates resource information for each of the scheduled CoMP UEs [Modulation and coding scheme (MCS), physical resource block (Physical resource block) Resource Block, PRB), PRB resource group allocated for non-CoMP UEs (the remaining resources not allocated to CoMP UEs are, this information does not have to be specifically notified to the cooperative base station. The following is called non-CoMP Resource), the information identifier corresponding to the specific CoMP transmission scheme, and the precoding restriction of the cooperative base station, the signal of the CoMP transmission, and/or the scheduling information such as the interference state.

In this embodiment, regardless of whether the CCN schedules the CoMP UE to perform single-point transmission or coordinated multi-point transmission, the specific scheduling is performed by the CCN, and the scheduling resource is selected by the CCN.

In particular, when the CCN is a coordinated transmission point selected by the CoMP UE and resources (MCS, PRB location, PRB number, etc.) of each CoMP UE, the resources may be valid in one cycle, or may remain valid until the next re-assignment. .

The CCN can switch the S1-U to the UE according to its own policy. For example, if the CCN last selects the serving base station as the transmission point of a CoMP UE, and selects the other base station as the transmission point of the CoMP UE in the next transmission point selection, The CCN may also notify the S-GW data transmission path change when selecting a new coordinated transmission point, so that the SGW sends the data to be transmitted of the CoMP UE to the transmission point of the CoMP UE. Preferably, if the original transmission point of the CoMP UE does not complete the data transmission, the CCN also notifies the original coordinated transmission point that the data is not transmitted to the new coordinated transmission point.

It is assumed that the CCN schedules the CS/CB transmission under e Bl for the UE1 according to the CSI and the amount of data to be transmitted (the specific scheduling information also includes the MCS level 6, the PRB number is 3, and the PRB index is 0~2), and the base station 3 performs The unidirectional transmission of eNB2 is scheduled for UE3 (the specific scheduling information also includes MCS level 3, the number of PRBs is 1, and the PRB index is 5). The CCN notifies the UE1 identifier, the scheduling information of the UE1 to the eNB1, and notifies the interference state information of the cooperative base station that is evasively avoided (such as the identifier of e B3 indicating that the CS/CB transmission has been evasive) eNB1; CCN informs eB2 of the UE3 identifier and the single point transmission scheduling information for UE3; CCN notifies eB3 of the available precoding matrix set for avoiding the interference of UE1 CS/CB transmission under eNB1.

Step 3: The coordinated base station receives the scheduling information of the CCN notification through the backhaul, acquires the to-be-transmitted data of the CoMP UE from the SGW, and performs scheduled transmission of the CoMP UE and the non-CoMP UE according to the notification of the CCN.

e Bl, e B2, and e B3 respectively receive scheduling information of the CCN through backhaul, and perform scheduling according to the scheduling information.

The e B 1 determines, according to the UE identifier and the UE scheduling information notified by the CCN, the scheduling user UE1 CS/CB transmission and the corresponding scheduling resource information, and forms a MAC PDU packet to generate a PDSCH; and determines e B3 as the interference according to the eNB identifier in the interference state information. The eNB avoids the base station, and calculates information such as the precoding matrix of the transmission according to the CSI information of the last one of the UE1. At the same time, the eNB1 generates the NDI information, the HARQ process number, the redundancy version number, the PDSCH resource mapping information, and the like of the corresponding data, and generates a PDCCH scheduling. CS1/CB transmission of UE1. On the PRB resource except the PRB index of 0~2, the eNB1 schedules the UE2 to perform non-CoMP transmission according to the CSI information recently reported by the UE2.

The e B2 determines, according to the UE identifier and the UE scheduling information notified by the CCN, the scheduled UE3 single-point transmission and scheduling resource information, and forms a MAC PDU packet. The precoding matrix of the transmission is calculated according to the CSI recently reported by the UE3 and the UE4. Such information, for single point transmission of UE3 and non-CoMP transmission of UE4.

e B3 performs scheduling according to the CSI recently reported by UE5, and does not use the precoding matrix other than the available precoding matrix set to schedule non-CoMP transmission of UE5.

Step 4: UE ACK/NACK feedback and retransmission.

The UE feeds back the ACK/NACK information to the respective serving base station. When the serving base station determines that retransmission is required according to the A/N feedback, the UE performs scheduling of the CoMP UE data retransmission using the current non-CoMP resource. That is, the CCN performs only the initial transmission scheduling of the CoMP UE, and the serving base station performs retransmission scheduling of the CoMP UE. The serving base station may also decide whether to perform retransmission scheduling of the UE according to whether the CCN schedules the data transmission of the CoMP UE at a possible retransmission time. Or limiting the CCN transmission point selection, that is, limiting the CCN to not schedule the CoMP UE at the time of possible CoMP UE retransmission, or scheduling a node other than the serving base station to perform new data transmission until receiving the data transmission by the serving base station. ACK feedback. In particular, if the CCN schedules the CoMP UE to schedule the retransmission of the UE at the same time for the new data transmission, the UE is required to have two HARQ processes in the same subframe of the serving cell (the HARQ process is extended, and the UE is added to the UE). The number of HARQ processes in the cell).

It is assumed that the TDD configuration of each coordinated base station is configuration 1, e B l schedules the CS/CB data initial transmission of UE1 and the non-CoMP transmission of UE2 in radio frame 1 subframe 0, and e B2 schedules a single point of UE3 in subframe 0. Transmission, UE4 non-CoMP transmission, e B3 scheduling UE5 non-CoMP transmission in subframe 0, UE A/N feeding back to the serving base station in subframe 7 UE, and UE1 feeding back NACK to e B 1 , UE4 feeding back NACK to e B2, Other UEs feed back ACKs to the respective serving base stations. Then, the eNB1 may schedule the retransmission of the UE1 (using the non-CoMP UE scheduling retransmission) using the non-CoMP resource at the moment in the subframe 1 of the radio frame 2, and the e B2 may use the subframe 1 in the radio frame 2, The non-CoMP resource at the moment schedules the retransmission of UE4. Further, in order to prevent the CCN and the eNB1 from scheduling the UE1 to perform new data transmission and retransmission in the subframe 1 of the radio frame 2, the eNB1 may select other available downlink resources, such as the radio frame 2, in the CCN scheduling UE1 for new data transmission. The sub-frame 4/5/6, etc., performs retransmission scheduling of UE1. Example 3

CCN scheduling CoMP UEs coordinate multi-point transmission, and the serving base station schedules single-point transmission of CoMP UEs. This scheme is applicable to all CoMP transmission technologies (DPS/DPB, CS/CB, JT), and this embodiment is only exemplified by CS/CB transmission.

The system ^! is the same as in Embodiment 2, and will not be repeated here.

Step 1: All user terminals report CSI information, and each base station transmits the CSI information and the data amount of the user terminal to be transmitted to the CCN through backhaul. The specific implementation process is the same as step 1 of the embodiment 2.

Step 2: The CCN determines the scheduling information according to the CSI information reported by the coordinated base station, the data volume information to be transmitted by the user terminal, and notifies the coordinated base station of the scheduling information.

The specific method is the same as the second step of the second embodiment. The difference is only: when the CCN schedules the CoMP UE to perform single-point transmission, the CCN only notifies the serving base station of the CoMP UE to perform single-point transmission to the UE, or does not notify the CoMP UE of any scheduling. The information is: The serving base station of the CoMP UE selects the scheduling resource of the CoMP UE from the resources other than the CoMP resource determined by the CCN scheduling information, and performs single-point transmission scheduling.

Assume that the CCN schedules the CS/CB transmission under e Bl for the UE1 according to the CSI and the amount of data to be transmitted (the specific scheduling information also includes MCS level 6, PRB number is 3, PRB index is 0~2), e B3 is performed. The interference avoidance; a single point transmission of e B2 is scheduled for UE3. The CCN notifies the UE1 identifier, the scheduling information of the UE1 to the eNB1, and notifies the interference state information of the cooperative base station that is evasively avoided (such as the identifier of e B3 indicating that the CS/CB transmission has been evasive). eNB1; CCN notifies UE 3 to e3 to notify the UE3 of the single-point transmission scheduling (or the CCN does not notify any scheduling information of UE3); CCN notifies eB3 of the available precoding matrix set for avoiding UE1 CS for eNB1 /CB transmission of interference.

Step 3: The coordinated base station receives the scheduling information of the CCN notification through the backhaul, and performs scheduling transmission of the CoMP UE and the non-CoMP UE according to the notification of the CCN.

The specific method is the same as step 3 of Embodiment 2, and will not be repeated here. The difference is only that: when the serving base station of the CoMP UE receives the CCN notification for the single point transmission of the CoMP UE, or does not receive any scheduling information of the CoMP UE notified by the CCN, the serving base station performs a single point transmission on the CoMP UE. Scheduling.

It is assumed that the eNB 1 determines the scheduling user UE1 CS/CB transmission and the corresponding scheduling resource information according to the UE identifier and the UE scheduling information notified by the CCN, and forms a MAC PDU packet to generate a PDSCH; and determines e B3 as a interference according to the eNB identifier in the interference state information. The base station is evaded, and the information such as the precoding matrix of the transmission is calculated according to the CSI information of the last one of the UE1; at the same time, the eNB1 generates the NDI information of the corresponding data, the HARQ process number, the redundancy version number, the PDSCH resource mapping information, etc., to generate the PDCCH scheduling. CS1/CB transmission of UE1. On the PRB resources other than the PRB index of 0~2, the eNB1 schedules the UE2 to perform non-CoMP transmission according to the CSI information recently reported by the UE2. The eNB 2 performs UE3 according to the UE3 identifier notified by the CCN, the UE3 single-point transmission indication, or the scheduling information of any UE3 that has not received the CCN notification, using the precoding matrix calculated by the CSI of the UE3 and the UE4 last 4 times. Single point transmission and non-CoMP transmission scheduling of UE4. The eNB3 performs scheduling according to the CSI recently reported by the UE5, and does not use the precoding matrix other than the set of available precoding matrices to schedule the non-CoMP transmission of the UE5.

Step 4: UE A/N feedback and retransmission. The specific method is the same as that in Embodiment 2, and is not repeated here. Example 4

CCN scheduling CoMP UEs coordinate multipoint transmission and single point transmission. This scheme is applicable to all CoMP transmission technologies (DPS/DPB, CS/CB, JT). This embodiment only uses DPS/DPB transmission as an example.

The system is the same as in the second embodiment.

Step 1 is the same as step 1 of the embodiment 2.

Step 2, the specific method is similar to step 2 of Embodiment 2.

The difference is as follows: Assume that the CCN schedules the eNB1 in the PRB index 1~3 according to the CSI and the amount of data to be transmitted. Silently, the single-point transmission of e B2 is scheduled for UE3 (the specific scheduling information also includes MCS level 3, the number of PRBs is 1, and the PRB index is 5), and the DPS/DPB transmission of UE1 on e B3 is scheduled (specific scheduling) The information also includes MCS level 6, PRB number is 3, PRB index is 1~3). The CCN notifies the coordinated base station to each of the cooperative base stations by backhaul. In addition, since the PDCCH information of the CoMP UE needs to be transmitted on the serving cell, the CCN needs to notify the coordinated base station of the scheduling information of the CoMP UE, and needs to transmit the selected DCI information and coordinated cell information for the UE1 DPS/DPB (e B3). The identifier, etc.), the UE1 identifier is notified to the eNB1. After receiving the scheduling information, the eNB1 groups the MAC PDU according to the scheduling information sent by the CCN, and sends the packet to the cooperative base station.

Step 3, the specific method is similar to Step 2 of Embodiment 2.

e Bl, e B2, and e B3 are scheduled according to the CCN notification. The eNB1 determines the UE1 identifier, the DCI information, the coordinated cell identifier e B3 selected for the DPS/DPB transmission, the packet MAC PDU, and notifies the UE identifier and the MAC PDU to the e B3 according to the scheduling information notified by the CCN (the eNB1 may always The generated MAC PDU is reserved until the eNB1 receives the corresponding ACK feedback sent by the UE1. The eNB1 generates the corresponding new data indicating the NDI information, the HARQ process number, the redundancy version number, and the PDSCH resource mapping information, and generates a PDCCH corresponding to the UE1 transmission; According to the identifier (eNB1 identifier, UE identifier, PRB identifier) on the quiet information field, the scheduled transmission is not performed on the silent resource indicated by the CCN. Based on the CCN notification, e B2 schedules single-point transmission of UE3 and data transmission of UE4 according to the CSI reported by UE3 and UE4. e B3 determines that UE1 is the target user terminal according to the scheduling information notified by the CCN. Since UE1 is not the serving user terminal of the base station, and the CCN does not notify the signal status information (for JT transmission), it is determined that the transmission point of the transmission is only the base station. Reading the interference information as the identifier of the eNB1, confirming that the eNB1 is silent on the corresponding PRB resource; eB3 determining the information corresponding to the base station transmission, the eNB1 silent precoding matrix, and the like according to the latest CSI information (the eNB1 interaction learned) of the UE1, and according to The MCS information, the PRB information, the PRB location, and the MAC PDU information of the eNB1 interaction generated by the CCN generate a PDSCH corresponding to the UE1 transmission (after the PDSCH is transmitted, e B3 may not retain the corresponding MAC PDU). The eNB1 and the eB3 need to ensure that the PDCCH and the PDSCH corresponding to the UE1 DPS/DPB transmission are sent in the same subframe. For example, the air interface can be simultaneously transmitted by using a predefined time mode (when the CCN notifies the scheduling information, the eNB1 and the eB3 are notified at n+). The PDCCH and the PDSCH are sent at time k, where n is the CCN information transmission time; e B2 receives the CCN scheduling information notification, and sends the PDCCH after the reserved k time, k is the estimated packet time of the non-serving base station e B3) .

Step 4: UE A/N feedback and retransmission. Step 4 of Embodiment 2 is not repeated here. Example 5

CCN scheduling CoMP UEs coordinate multipoint transmission and single point transmission. This solution is applicable to all CoMP transmission technologies (DPS/DPB, CS/CB, JT). This embodiment only uses JT transmission as an example.

The system is the same as in the second embodiment.

Step 1, the same as step 1 of the embodiment 2. Step 2, the specific method is similar to Step 2 of Embodiment 2.

The difference is as follows: Assume that the CCN schedules the JT transmission of UE1 between eNB1 and e B3 according to the CSI and the amount of data to be transmitted (the specific scheduling information also includes MCS level 6, PRB number is 3, PRB index is 1~3), scheduling The single-point transmission of UE3 in e B2 (the specific scheduling information also includes MCS level 3, the number of PRBs is 1, and the PRB index is 5).

Step 3, the specific method is similar to Step 2 of Embodiment 2.

e Bl, e B2, and e B3 are scheduled according to the CCN notification. The eNB1 receives the scheduling information notified by the CCN, and determines that the eNB1 and the eB3 perform JT transmission on the UE1 according to the e B identifier (the eNB1 identifier, the e B3 identifier) and the UE identifier indicated on the signal status information field; according to the DCI information and the signal status information field. The eNB1, the e B3 identifier, the packet MAC PDU, and the information about the PMI of the JT scheduling time are generated according to the latest CSI reported by the UE1; the eNB1 interacts with the MAC PDU and the UE1 identifier to the e B3 (the eNB1 may keep the generated MAC PDU all the time). Until eNB1 receives the corresponding ACK feedback sent by UE1); eNB1 generates corresponding new data indicating NDI information, HARQ process number, redundancy version number, PDSCH resource mapping information. Based on the CCN notification, e B2 schedules single-point transmission of UE3 and data transmission of UE4 according to the CSI reported by UE3 and U4. The e B3 receives the scheduling information of the CCN notification, and determines the JT transmission of the UE1 and the eB3 scheduling UE1 according to the signal status information field indication, and calculates the MCS and PRB information notified by the CCN, the MAC PDU exchanged by the eNB1, and the CSI information recently reported by the UE1. Information such as PMI transmitted by JT is scheduled for PDSCH transmission of UE1. eNB1 and eNB3 need to ensure that the PDCCH and PDSCH corresponding to the UE1 JT transmission are sent in the same subframe.

Step 4: UE A/N feedback and retransmission. Step 4 of Embodiment 2 is not repeated here. The above embodiment proposes a data transmission architecture in a non-ideal backhaul CoMP central scheduling scenario. In this architecture, the data transmission path between the CoMP UE and the core network is still S-GW<->serving base station<->UE (that is, the data direct connection port exists between the S-GW and the serving base station of the user), CCN Only has scheduling control functions for CoMP UEs.

The foregoing embodiment of the present invention provides a data transmission method for cooperative coordinated multi-point transmission center cooperative scheduling in a non-ideal backhaul scenario between base stations, which can solve the problem that when CCN is used as a scheduling control node in a non-ideal backhaul scenario User data transmission processing problem helps the network side to timely and accurately implement scheduling decisions and data transmission processing for CoMP users, and reduces the impact of backhaul delay on CoMP center scheduling.

Based on the same inventive concept, the embodiment of the present invention further provides a data transmission apparatus for cooperative multi-point transmission center scheduling, and the principle of solving the problem is similar to the data transmission method of a coordinated multi-point transmission center scheduling, so the apparatus For the implementation of the method, refer to the implementation of the method, and the repetition will not be repeated.

The CCN provided by the embodiment of the present invention, as shown in FIG. 7, includes:

The information acquiring unit 701 is configured to acquire channel state information CSI of all UEs and a user plane data amount to be transmitted from a coordinated transmission point that belongs to the same cooperation set as the CCN; The scheduling transmission unit 702 is configured to perform, according to the CSI of all UEs and the amount of user plane data to be transmitted, the CCN scheduled coordinated transmission point, and perform coordinated transmission of the user plane data of the coordinated multi-point transmission user terminal CoMP UE.

In a specific implementation, the foregoing functions may be configured on a processor and implemented by a processor.

In a specific implementation, the processor is configured to have the above functions.

Preferably, the method further includes: a notification unit, configured to: when the coordinated transmission point of the CoMP UE is selected, notify the selected coordinated transmission point to the SGW, so that the SGW sends the user plane data of the CoMP UE to be transmitted to the selected coordinated transmission. In implementation, the above functions are configured on the processor and implemented by the processor.

An embodiment of the present invention further provides a coordinated transmission point, as shown in FIG. 8, including:

The reporting unit 801 is configured to report, to the CCN, channel state information CSI and the amount of user plane data to be transmitted of all UEs in the coordinated transmission point;

The data obtaining unit 802 is configured to obtain, from the SGW or the serving base station of the coordinated multi-point transmission user terminal CoMP UE, the user plane data of the CoMP UE to be transmitted;

The scheduling transmission unit 803 is configured to: determine, by using the CCN, the CoMP resource used by the CoMP UE data transmission, perform the user plane data scheduling transmission of the CoMP UE by using the CoMP resource, and perform the non-CoMP by using the non-CoMP resource. User plane data scheduling transmission of the UE.

In the specific implementation, the above functions are configured on the processor and implemented by the processor.

Preferably, the data retransmission unit uses the current non-CoMP resource to schedule CoMP UE data retransmission, and specifically includes: scheduling, by the CCN, the CoMP UE to perform CoMP UE data retransmission at a time other than the new data transmission by the serving base station to the CoMP UE.

a data notification unit, configured to determine, according to the scheduling information of the CCN notification, another coordinated transmission point for performing data transmission with the CoMP UE; and generate a MAC according to the scheduling information and the user plane data of the CoMP UE to be transmitted received from the SGW

PDU; The generated MAC PDU is sent to other coordinated transmission points for data transmission with the CoMP UE. In the specific implementation, the above functions are configured on the processor and implemented by the processor.

As shown in FIG. 9, in the embodiment of the present invention, the CCN includes a processor 901 and a data transceiving interface 902 in hardware. In specific implementation, the processor 901 is configured to: from a coordinated transmission point belonging to the same collaborative set as the CCN. Obtaining channel state information CSI of all UEs and the amount of user plane data to be transmitted; communicating with the coordinated transmission point scheduled by the CCN according to the CSI of all UEs and the amount of user plane data to be transmitted, and performing a coordinated multipoint transmission of the user plane of the user terminal CoMP UE The data transmission and reception interface 902 is configured to implement data transmission and reception between the processor 901 and the coordinated transmission point.

Preferably, the processor communicates with the scheduled coordinated transmission point, and performs scheduling transmission of the user plane data of the CoMP UE, including:

Preferably, the data transceiver interface is further configured to:

When the coordinated transmission point of the CoMP UE is selected, the selected coordinated transmission point is notified to the SGW, so that the SGW sends the to-be-transmitted user plane data of the CoMP UE to the selected coordinated transmission point. As shown in FIG. 10, in the embodiment of the present invention, the coordinated transmission point includes a processor 1001 and a data transceiving interface 1002 in hardware. In specific implementation, the processor 1001 is configured to: report to the CCN and all the coordinated transmission points. The channel state information CSI of the UE and the amount of user plane data to be transmitted; the user plane data to be transmitted of the CoMP UE is obtained from the serving base station of the SGW or the coordinated multipoint transmission user terminal CoMP UE; and the CoMP UE data is determined by communicating with the CCN. The CoMP resource used for transmission is used to perform the user plane data scheduling transmission of the CoMP UE by using the CoMP resource, and the user plane data scheduling transmission of the non-CoMP UE is performed by using the non-CoMP resource; the data transceiving interface 1002 is configured to implement between the processor and the CCN and the UE. Data is sent and received.

According to the negative acknowledgement NACK feedback information of the CoMP UE, it is determined that data retransmission is required, and the current non-CoMP resource is used to schedule CoMP UE data retransmission.

Preferably, the data transceiving interface uses the current non-CoMP resource to schedule CoMP UE data retransmission, and specifically includes: scheduling, by the CCN, the CoMP UE to perform CoMP UE data retransmission at a time other than the new data transmission by the serving base station to the CoMP UE.

Preferably, the CCN schedules the CoMP UE to perform coordinated multi-point transmission, where the coordinated transmission point is a serving base station of the CoMP UE, and the data transceiver interface is further configured to: Determining, according to the scheduling information notified by the CCN, another coordinated transmission point for performing data transmission with the CoMP UE; generating a MAC PDU according to the scheduling information and the user plane data to be transmitted of the CoMP UE received from the SGW; and transmitting the generated MAC PDU to the CoMP UE Other collaborative transmission points for data transmission.

The foregoing coordinated transmission point may include a base station and a relay node, where the base station includes a macro base station (Mac), a micro base station (Micro), a pico base station (Pico), a home base station, or a femto base station (Femto). And other possible wireless access points (APs) that use TDD mode.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the present invention can be embodied in the form of a computer program product embodied on one or more computer-usable storage interfaces (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each process and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Although the preferred embodiment of the invention has been described, it will be apparent to those skilled in the art that, Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and It is apparent that those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, it is intended that the present invention cover the modifications and modifications of the embodiments of the invention.

Claims

Rights request

1. A data transmission system scheduled by a cooperative multipoint transmission center, which is characterized by including:

The serving gateway SGW sends the user plane data to be transmitted of the CoMP UE to the serving base station of the coordinated multipoint transmission user terminal CoMP UE;

The central coordination point CCN obtains the channel state information CSI of all UEs and the amount of user plane data to be transmitted from the coordination transmission points that belong to the same coordination set as the CCN. Based on the CSI of all UEs and the amount of user plane data to be transmitted, it cooperates with CCN scheduling Transmission point communication, performs scheduled transmission of user plane data of CoMP UE;

A cooperative transmission point that belongs to the same cooperative set as the CCN provides the CCN with the CSI of all UEs under the cooperative transmission point and the amount of user plane data to be transmitted, and determines the CoMP resources used for CoMP UE data transmission by communicating with the CCN, using CoMP resources perform scheduled transmission of user plane data of CoMP UE, and non-CoMP resources are used to perform scheduled transmission of user plane data of non-CoMP UE. When the cooperative transmission point is the serving base station of non-CoMP UE, it is obtained from the serving base station of CoMP UE. User plane data to be transmitted by CoMP UE.

2. A data transmission system scheduled by a cooperative multipoint transmission center, which is characterized by including:

The serving gateway SGW sends the CoMP UE's user plane data to be transmitted to the coordinated transmission point that schedules coordinated multipoint transmission user terminal CoMP UE for data transmission;

A cooperative transmission point that belongs to the same cooperative set as the CCN, provides the CSI of all UEs under the cooperative transmission point and the amount of user plane data to be transmitted to the CCN, obtains the user plane data to be transmitted of the CoMP UE from the SGW, and communicates with the CCN , determine the CoMP resources used for data transmission of CoMP UE, use CoMP resources to perform scheduled transmission of user plane data of CoMP UE, and use non-CoMP resources to perform scheduled transmission of user plane data of non-CoMP UE.

3. A data transmission method scheduled by the coordinated multipoint transmission center applied to the system of claim 1 or 2, characterized in that it includes:

The central cooperation node CCN obtains the channel state information CSI of all UEs and the amount of user plane data to be transmitted from the cooperation transmission points that belong to the same cooperation set as the CCN;

According to the CSI of all UEs and the amount of user plane data to be transmitted, communicate with the coordinated transmission point scheduled by the CCN to perform scheduled transmission of user plane data of the coordinated multipoint transmission user terminal CoMP UE.

4. The method of claim 3, wherein the CCN communicates with its scheduled cooperative transmission point to perform scheduled transmission of user plane data of the CoMP UE, including:

The CSI of all UEs in the CCN and the amount of user plane data to be transmitted are determined. When the CoMP UE performs coordinated multi-point transmission, the coordinated transmission point of the CoMP UE is selected and the scheduling information of the CoMP UE is generated; The CCN notifies the coordinated transmission point of the CoMP UE of the generated scheduling information.

5. The method of claim 4, characterized in that,

When the CoMP UE's coordinated transmission point does not include the CoMP UE's serving base station, the CCN will also notify the CoMP UE's serving base station of the generated scheduling information.

6. The method of claim 5, characterized in that,

For CoMP UEs that perform coordinated multipoint transmission, when the serving base station of the CoMP UE determines that data retransmission is required based on the negative acknowledgment NACK feedback information of the CoMP UE, it determines the CoMP resources based on the CCN scheduling information, and uses the current non-CoMP resources to schedule the CoMP UE. Data retransmission.

7. The method of claim 6, wherein the serving base station of the CoMP UE uses current non-CoMP resources to schedule CoMP UE data retransmission, specifically including:

The serving base station of the CoMP UE uses the CCN to schedule the CoMP UE data retransmission at times other than when the serving base station of the CoMP UE transmits new data to the CoMP UE.

8. The method of claim 6, wherein the serving base station of the CoMP UE uses current non-CoMP resources to schedule CoMP UE data retransmission, specifically including:

The CCN does not schedule the CoMP UE's serving base station to transmit new data to the CoMP UE at a time when the CoMP UE's serving base station may schedule CoMP UE data retransmission; or

Before the CCN receives the ACK feedback of the retransmitted data from the CoMP UE's serving base station, it does not schedule the CoMP UE's serving base station to transmit new data to the CoMP UE.

9. The method of claim 5, wherein for a CoMP UE performing coordinated multi-point transmission, when the serving base station of the CoMP UE determines that data retransmission is required based on the negative acknowledgment NACK feedback information of the CoMP UE, it retransmits the data to the CoMP UE. transfer data;

If the serving base station of the CoMP UE retransmits data to the CoMP UE at the same time, the CCN schedules the serving base station of the CoMP UE to transmit new data to the CoMP UE, then the serving base station of the CoMP UE receives the new data and the retransmitted data respectively through two HARQs. ACK/NACK feedback.

10. The method of claim 3, wherein the CCN communicates with its scheduled cooperative transmission point to perform scheduled transmission of user plane data of the CoMP UE, including:

Based on the CSI of all UEs and the amount of user plane data to be transmitted, the CCN determines that when the CoMP UE performs non-multipoint coordinated transmission, then:

The CCN generates scheduling information for the CoMP UE and sends the generated scheduling information to the serving base station of the CoMP UE; or

The CCN sends the non-cooperative transmission identification to the serving base station of the CoMP UE;

The CCN does not send any information related to the CoMP UE to the serving base station of the CoMP UE.

11. The method according to claim 4 or 5, characterized in that the method is applied to the system according to claim 2. system, also includes:

When selecting the coordinated transmission point of the CoMP UE, the CCN notifies the SGW of the selected coordinated transmission point, so that the SGW sends the user plane data to be transmitted of the CoMP UE to the selected coordinated transmission point.

12. The method according to claim 4 or 5, characterized in that, the method is applied to the system according to claim 1, and further includes:

The serving base station of the CoMP UE determines other cooperative transmission points for data transmission with the CoMP UE based on the scheduling information notified by the CCN;

The serving base station of the CoMP UE generates MAC PDU based on the scheduling information and the user plane data to be transmitted of the CoMP UE received from the SGW;

The serving base station of the CoMP UE sends the generated MAC PDU to other cooperative transmission points that perform data transmission with the CoMP UE.

13. A data transmission method scheduled by the coordinated multipoint transmission center applied to the system of claim 1 or 2, characterized in that it includes:

The channel state information CSI of all UEs under the coordinated transmission point on the CCN and the coordinated transmission point and the amount of user plane data to be transmitted;

The coordinated transmission point obtains the user plane data to be transmitted of the CoMP UE from the SGW or from the serving base station of the coordinated multipoint transmission user terminal CoMP UE;

The cooperative transmission point determines the CoMP resources used for data transmission of CoMP UEs by communicating with the CCN, uses CoMP resources to perform scheduled transmission of user plane data of CoMP UEs, and uses non-CoMP resources to perform scheduled transmission of user plane data of non-CoMP UEs.

14. The method according to claim 13, characterized in that the cooperative transmission point uses CoMP resources to perform scheduled transmission of user plane data of CoMP UE, specifically including:

Receive the CCN to determine the CoMP UE's scheduling information sent when the CoMP UE performs coordinated multipoint transmission; determine the CoMP resources used by the CoMP UE for data transmission based on the scheduling information, and generate the media access control protocol data unit MAC based on the scheduling information and the user plane data to be transmitted. PDU;

Use CoMP resources to transmit MAC PDIL on the physical downlink shared channel PDSCH

15. The method of claim 13, wherein the CCN schedules the CoMP UE to perform coordinated multipoint transmission, and the coordinated transmission point is the serving base station of the CoMP UE, and further includes:

When the serving base station of the CoMP UE determines that data retransmission is required based on the negative acknowledgment NACK feedback information of the CoMP UE, it uses the current non-CoMP resources to schedule the CoMP UE data retransmission.

16. The method of claim 15, wherein the serving base station of the CoMP UE uses current non-CoMP resources to schedule CoMP UE data retransmission, specifically including:

The serving base station of the CoMP UE uses the CCN to schedule the serving base station of the CoMP UE to transmit new data to the CoMP UE. At times other than transmission, the CoMP UE data is scheduled to be retransmitted.

17. The method of claim 15, further comprising:

If the serving base station of the CoMP UE retransmits data to the CoMP UE at the same time, it is determined that the CCN schedules the serving base station of the CoMP UE to transmit new data to the CoMP UE. The serving base station of the CoMP UE receives the new data and the retransmitted data respectively through two HARQs. ACK/NACK feedback.

18. The method of claim 13, wherein the CCN schedules the CoMP UE to perform non-coordinated multipoint transmission, the cooperative transmission point is a serving base station of CoMP, and the cooperative transmission point uses CoMP resources to execute the user plane data of the CoMP UE. Scheduling transmission, including:

Receive the scheduling information of the CoMP UE sent by the CCN, determine the CoMP resources used for data transmission of the CoMP UE based on the scheduling information, generate the MAC PDU based on the scheduling information and the user plane data to be transmitted, and use the CoMP resources to transmit the MAC PDU on the PDSCH; or

When receiving the non-cooperation transmission identifier sent by the CCN or not receiving any relevant information of the CoMP UE, determine that the CoMP UE performs non-CoMP transmission, and determine that the CoMP UE performs non-CoMP transmission from resources other than the CoMP resources determined by the CCN scheduling information. The CoMP resources used, the MAC PDU is generated based on the determined CoMP resources, and the MAC PDU is transmitted on the PDSCH using the determined CoMP resources.

19. The method of claim 13, wherein the CCN schedules the CoMP UE to perform coordinated multipoint transmission, and the coordinated transmission point is the serving base station of the CoMP UE, and further includes:

20. The method of claim 13, wherein the coordinated transmission point reports to the CCN the amount of user plane data to be transmitted with all UEs under the coordinated transmission point, specifically including:

The cooperative transmission point transmits to the CCN the amount of user plane data to be transmitted for all UEs under the cooperative transmission point in a dynamic manner, a semi-static manner or an event-triggered manner.

21. A collaboration center node CCN, characterized by: including:

The information acquisition unit is used to obtain the channel state information CSI of all UEs and the amount of user plane data to be transmitted from the coordination transmission points that belong to the same coordination set as the CCN;

The scheduling transmission unit is used to communicate with the coordinated transmission point scheduled by the CCN according to the CSI of all UEs and the amount of user plane data to be transmitted, and perform scheduled transmission of user plane data of the coordinated multipoint transmission user terminal CoMP UE.

22. The CCN according to claim 21, characterized in that: the scheduled transmission unit and its scheduled cooperative transmission point Communication, performing scheduled transmission of user plane data of CoMP UE, including:

The CSI of all UEs in the CCN and the amount of user plane data to be transmitted are used to determine when the CoMP UE performs coordinated multi-point transmission, select the coordinated transmission point of the CoMP UE, and generate the scheduling information of the CoMP UE;

The CCN notifies the CoMP UE's coordinated transmission point of the generated scheduling information.

23. The CCN of claim 22, wherein when the cooperative transmission point of the CoMP UE does not include the serving base station of the CoMP UE, the scheduling transmission unit will also notify the serving base station of the CoMP UE of the generated scheduling information.

24. The CCN according to claim 23, wherein the scheduling transmission unit does not schedule the serving base station of the CoMP UE to transmit new data to the CoMP UE at a time when the serving base station of the possible CoMP UE schedules CoMP UE data retransmission. transmit; or

Before the scheduling transmission unit receives the ACK feedback of the retransmitted data from the CoMP UE's serving base station, it does not schedule the CoMP UE's serving base station to transmit new data to the CoMP UE.

25. The CCN according to claim 21, characterized in that the scheduled transmission unit communicates with its scheduled cooperative transmission point to perform scheduled transmission of user plane data of the CoMP UE, specifically including:

According to the CSI of all UEs and the amount of user plane data to be transmitted, when it is determined that the CoMP UE performs non-coordinated multipoint transmission, then:

Generate scheduling information for the CoMP UE, and send the generated scheduling information to the serving base station of the CoMP UE; or send the non-cooperative transmission identifier to the serving base station of the CoMP UE;

Do not send any information related to the CoMP UE to the serving base station of the CoMP UE.

26. The CCN according to claim 22 or 23, further comprising:

The notification unit is configured to notify the SGW of the selected coordinated transmission point when selecting a coordinated transmission point of the CoMP UE, so that the SGW sends the user plane data to be transmitted of the CoMP UE to the selected coordinated transmission point.

27. A collaborative transmission point, characterized by: including:

The upper unit is used to provide the CCN with the channel state information CSI of all UEs under the coordinated transmission point and the amount of user plane data to be transmitted;

A data acquisition unit, configured to acquire the user plane data to be transmitted of the CoMP UE from the SGW or from the serving base station of the CoMP UE;

The scheduling transmission unit is configured to determine the CoMP resources used for data transmission of the CoMP UE by communicating with the CCN, utilize the CoMP resources to perform scheduled transmission of user plane data of the CoMP UE, and utilize non-CoMP resources to perform scheduled transmission of user plane data of the non-CoMP UE.

28. The cooperative transmission point according to claim 27, wherein the scheduling transmission unit uses CoMP resources to perform scheduled transmission of user plane data of the CoMP UE, specifically including:

Receive the CCN to determine the CoMP UE's scheduling information sent when the CoMP UE performs coordinated multi-point transmission; determine the CoMP resources used by the CoMP UE for data transmission based on the scheduling information, and determine the CoMP resources used for data transmission based on the scheduling information and the user to be transmitted. Household data generates media access control protocol data unit MAC PDU;

29. The coordinated transmission point according to claim 27, wherein the scheduling transmission unit schedules the CoMP UE to perform coordinated multipoint transmission, and the coordinated transmission point is the serving base station of the CoMP UE, and further includes:

The data retransmission unit is used to determine that data retransmission is required based on the negative acknowledgment NACK feedback information of the CoMP UE, and use the current non-CoMP resources to schedule the CoMP UE data retransmission.

30. The cooperative transmission point according to claim 29, characterized in that the data retransmission unit uses current non-CoMP resources to schedule CoMP UE data retransmission, specifically including:

The CCN is used to schedule CoMP UE data retransmissions at times other than when the CoMP UE's serving base station transmits new data to the CoMP UE.

31. The coordinated transmission point according to claim 29, wherein the data retransmission unit is also used to determine the same time when the serving base station of the CoMP UE retransmits data to the CoMP UE, and the CCN schedules the serving base station of the CoMP UE to retransmit data to the CoMP UE. When transmitting new data, ACK/NACK feedback of new data and retransmitted data are received through two HARQs respectively.

32. The cooperative transmission point of claim 27, wherein the CCN schedules the CoMP UE to perform non-coordinated multipoint transmission, the cooperative transmission point is a serving base station of CoMP, and the scheduling transmission unit uses CoMP resources to perform the CoMP UE user Planned data transmission, including:

33. The coordinated transmission point as claimed in claim 27, characterized in that the CCN schedules the CoMP UE to perform coordinated multipoint transmission, and the coordinated transmission point is the serving base station of the CoMP UE, and further includes:

The data notification unit is configured to determine other cooperative transmission points for data transmission with the CoMP UE based on the scheduling information notified by the CCN; generate a MAC PDU based on the scheduling information and the user plane data to be transmitted of the CoMP UE received from the SGW; convert the generated MAC The PDU is sent to other cooperative transmission points that perform data transmission with the CoMP UE.

34. The cooperative transmission point according to claim 27, characterized in that the reporting unit reports to the CCN the amount of user plane data to be transmitted with all UEs under the cooperative transmission point, specifically including:

In a dynamic manner, a semi-static manner or an event-triggered manner, the amount of user plane data to be transmitted for all UEs under the cooperative transmission point is transmitted to the CCN.