WO2012051878A1

WO2012051878A1 - Scheduling method and system for coordinated transmission

Info

Publication number: WO2012051878A1
Application number: PCT/CN2011/078142
Authority: WO
Inventors: 李翱翔; 王文焕
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-10-22
Filing date: 2011-08-09
Publication date: 2012-04-26
Also published as: CN102457358A; CN102457358B

Abstract

A scheduling method for coordinated transmission is provided, wherein the method includes the steps of: a serving cell divides users in said serving cell into the central users and the edge users and determines coordinated cells of the edge users; said serving cell accomplishes, together with said coordinated cells, the coordinated scheduling for the edge users in said serving cell and accomplishes the scheduling for the central users in said serving cell with the remainder resources of said serving cell; a scheduling system for coordinated transmission is also provided. According to the technical scheme of the present invention, User Equipments (UEs) applying Coordinated Multi-Point transmission (CoMP) and common UEs are uniformly processed, thus the multi-cell coordinated transmission of the edge UEs can be achieved easily with the present Long Term Evolution (LTE) system.

Description

Scheduling method and system for cooperative transmission

The present invention relates to the field of wireless communications, and in particular, to a scheduling method and system for cooperative transmission of multiple cells in a Long Term Evolution Advanced (LTE-A) system. Background technique

The International Telecommunications Union's Radiocommunication Sector of International Telecommunicai Union (ITU) has set extremely high data rate and spectral efficiency performance requirements for the next generation mobile communication system (IMT-Advanced, International Mobile Telecommunications Advanced). Peak rate: IMT-Advanced requires more than 1Gbit/s in low-speed mobile and hot-cover coverage scenarios; 100Mbit/s in high-speed mobile and wide-area coverage scenarios. Peak spectral efficiency: Ibp-Advanced requires 15bps/Hz; upper behavior is 6.75 bps/Hz ₀

In order to meet and exceed the requirements of IMT-Advanced within the ITU's time plan, while maintaining good backward compatibility with Long Term Evolution (LTE), the 3rd Generation Partnership Project 3GPP launched LTE-A Related work. Cooperative Multipoint Transmission CoMP is a key technology in LTE-A and is considered to be an effective way to improve cell edge user performance and average cell throughput.

CoMP transmission scheme has been determined that there are currently two: one is coordinated scheduling / beamforming (CS / CB, Coordinated Scheduling / Beamforming); the other is a joint transmission / processing (JT / JP, Joint Transmission / Processing) 0 In the CS/CB transmission scheme, user data exists only in the serving cell of the user, and each coordinated cell exchanges information and channel information by mutual interaction, thereby achieving the purpose of coordinating interference between the coordinated cells. User data is shared among the cooperative cells in the JT/JP transmission scheme, and mutual scheduling information and channel state information are exchanged with each other (CSI, Channel Situation Information), etc., transmitting signals to the user on the same time-frequency resource, and the user performs joint processing on the signals of the plurality of cooperation points received, thereby improving the quality of the useful signal.

It can be seen from the description of the above two CoMP transmission schemes that the implementation of the CoMP technology requires multiple cells to work together. In the prior art, the scheduling processes between the cells of the radio access network are independent of each other, and no scheduling information of the terminal user interacts. Therefore, users at the edge of the cell are highly susceptible to interference of the same-frequency signals of the neighboring cells, resulting in system performance degradation. Summary of the invention

In view of this, it is a primary object of the present invention to provide a scheduling method and system for cooperative transmission to at least solve the above problems.

According to an aspect of the present invention, a method for scheduling coordinated transmission includes: a serving cell classifying users in the serving cell into a central user and an edge user, and determining a coordinated cell of the edge user; Performing cooperative scheduling of the edge users in the serving cell together with the coordinated cell, and completing scheduling of the central user in the serving cell in the remaining resources of the serving cell.

Further, the serving cell divides the users in the serving cell into a central user and an edge user, and determines that the coordinated cell of the edge user is: the serving cell sends a signal strength measurement to all users in the serving cell. Requesting; the user in the serving cell reports the measurement result to the serving cell; the serving cell compares the measurement result with a preset threshold, and divides all users in the serving cell into edge users and central users. And comparing the measurement result of the edge user with a preset threshold 2 to determine a coordinated cell of the edge user;

Further, the signal strength measurement request includes a neighbor cell list and a measurement value that the edge user needs to measure; the neighbor cell list is specified by the serving cell; the measurement value includes a reference signal received power RSRP, and/or The reference signal received quality RSRQ, and/or any amount that characterizes the transmitted signal strength of the serving cell; the predetermined threshold is determined by system simulation or takes an empirical value. After the serving cell determines the coordinated cell of all the edge users in the serving cell, the method further includes: the serving cell sending a channel feedback request to the edge user, and the edge user according to the channel feedback request The channel information of the coordinated cell is reported to the serving cell, and the serving cell classifies channel information of the coordinated cell.

Further, the channel feedback request includes the coordinated cell information of the edge user; the serving cell classifies the channel information of the coordinated cell according to the cell ID included in the channel information, and divides the channel information into the same eNodeB and different eNodeBs.

Further, the serving cell and the coordinated cell jointly perform coordinated scheduling of the edge users in the serving cell, and complete the central user scheduling in the serving cell in the remaining resources of the serving cell:

The serving cell pre-schedules the edge user, allocates a frequency domain resource to the edge user, and sets an effective time of the pre-scheduling result according to the channel information classification situation fed back by the edge user;

The serving cell and the coordinated cell exchange the pre-scheduling result and the channel information; the serving cell and the coordinated cell respectively check whether the pre-scheduled resource overlaps and re-acquire a pre-coding vector at a resource overlapping position;

The serving cell checks whether the pre-scheduling result of the edge user is valid at the scheduled time. If the result is effective, the scheduling result of the edge user is delivered, and the remaining available resources of the cell are updated according to the scheduling result. Dispatching the central user on the remaining available resources and delivering the central user scheduling result.

Further, the effective time of setting the pre-scheduling result is: if the channel information fed back by the edge user belongs to the same eNodeB, set a smaller pre-scheduling result effective time, and the smaller pre-scheduling result effective time If the part of the channel information that is fed back by the edge user belongs to a different eNodeB, set a larger pre-scheduling result effective time, and the larger pre-scheduling result effective time guarantees the pre-scheduled result and the Channel information Interact between X2 ports.

According to another aspect of the present invention, a system for scheduling coordinated transmission includes: a scheduling module, located in an eNodeB, configured to complete scheduling of edge users and a central user in a serving cell; and an execution module, located in the UE, for Measuring measurement information of the user scheduling and feedback of the measurement information to the serving cell.

Further, the scheduling module further includes: a user grouping unit, configured to divide the user in the serving cell into a cell edge user and a cell center user; a coordination set determining unit, configured to determine, by the serving cell, the edge user a data receiving unit, configured to receive, by the serving cell, channel information that is fed back by the edge user; a resource scheduling unit, configured to perform pre-scheduling of the serving cell to an edge user, and perform scheduling processing on a central user; a scheduling result and channel information required for the interaction between the serving cell and the coordinated cells; a precoding calculation unit, configured to calculate, by the serving cell, a precoding vector for processing the data to be sent; a unit, configured to send, by the serving cell, scheduling result information of the user.

Further, the execution module further includes: a measurement unit, configured to perform, by the user in the serving cell, a measurement request of the serving cell, and a feedback unit, where the user in the serving cell feeds back a corresponding measurement result to the Service area.

The scheduling method and system provided by the present invention can perform unified processing on a CoMP-enabled UE and a normal UE, and can easily implement multi-cell coordinated transmission to a cell edge UE on an existing LTE system; the serving cell and the neighboring cell UE use the same The location of the frequency domain resource, the downlink data processing by using the method of the present invention can reduce the co-channel interference of the cell edge UE, thereby improving the throughput of the cell edge UE, and further improving the average throughput of the entire cell. DRAWINGS

The drawings are intended to provide a further understanding of the present invention, and are intended to be a part of the present invention, and the description of the present invention is not intended to limit the invention. In the drawing: 1 is a schematic diagram of an application scenario of downlink multi-cell coordinated transmission in the prior art;

2 is a schematic diagram of an intra-eNodeB CoMP according to an embodiment of the present invention;

3 is a schematic diagram of an inter-eNodeB CoMP according to an embodiment of the present invention;

4 is a schematic flowchart of a scheduling method according to an embodiment of the present invention;

FIG. 5 is a schematic flowchart of an edge UE scheduling process according to an embodiment of the present invention; FIG.

6 is a schematic diagram of a central UE scheduling process according to an embodiment of the present invention;

7 is a schematic structural diagram of a scheduling system according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a preferred structure of a scheduling system according to an embodiment of the present invention. detailed description

The basic idea of the present invention is: the serving cell divides the users in the serving cell into a central user and an edge user, and determines a coordinated cell of the edge user; the serving cell and the coordinated cell jointly complete the serving cell Collaborative scheduling of edge users, and completing scheduling of central users in the serving cell in remaining resources of the serving cell.

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

According to an embodiment of the present invention, a scheduling method for cooperative transmission is provided. As described in FIG. 4, the method includes:

Step S401: The serving cell divides the users in the serving cell into a central user and an edge user, and determines a coordinated cell of the edge user;

Step S402: The serving cell and the coordinated cell jointly perform coordinated scheduling of the edge users in the serving cell, and complete scheduling of the central user in the serving cell in the remaining resources of the serving cell.

With this embodiment, multi-cell coordinated transmission to the cell edge UE is easily implemented on the existing LTE system, thereby reducing co-channel interference of the cell edge UE, improving the throughput of the cell edge UE, and further improving the average throughput of the entire cell. . Step S401 can be implemented in the following manner: the serving cell sends a signal strength measurement request to all users in the serving cell; all users in the serving cell report the measurement result to the serving cell; Comparing the measurement result with the preset threshold, the user in the serving cell is divided into the edge user and the central user, and the measurement result of the edge user is compared with the preset threshold 2 to determine the coordinated cell of the edge user.

Further, the signal strength measurement request includes a neighbor cell list and a measurement value that the edge user needs to measure; the neighbor cell list is specified by the serving cell; the measured value may be one or more of the following parameters: Species: Reference Signal Receiving Power (RSRP), Reference Signal Receiving Quality (RSR), any amount that characterizes the transmitted signal strength of the serving cell; the preset threshold is simulated by the system Determine or take the risk value.

Further, after the serving cell determines the coordinated cell of all the edge users in the serving cell, the method further includes: the serving cell sending a channel feedback request to the edge user, where the edge user performs the channel feedback request The channel information of the coordinated cell is reported to the serving cell, and the serving cell classifies the channel information of the coordinated cell.

Further, the channel feedback request includes the coordinated cell information of the edge user; the serving cell classifies the channel information of the coordinated cell into the same eNodeB according to the cell ID included in the channel information. And two different eNodeB classes.

Step S402 can be implemented as follows:

The serving cell pre-schedules the edge user, allocates a frequency domain resource to the edge user, and sets an effective time of the pre-scheduled result according to the channel information classification situation fed back by the edge user;

The serving cell and the coordinated cell exchange the pre-scheduling result and the channel information; the serving cell and the coordinated cell respectively check whether the scheduling resource overlaps and re-acquire a pre-coding vector at a resource overlapping position; The serving cell checks whether the pre-scheduling result of the edge user is valid at the current scheduling time, and if the result is already valid, the scheduling result of the edge user is delivered, and the remaining available resources of the cell are updated according to the scheduling result, and then Dispatching the central user on the remaining available resources and delivering the central user scheduling result.

Further, the step of setting the effective time of the pre-scheduling result includes: if the channel information fed back by the edge user belongs to the same eNodeB, setting a smaller pre-scheduling result effective time, the smaller pre-scheduling result The effective time is greater than the scheduling period; if part or all of the channel information fed back by the edge user belongs to different eNodeBs, a larger pre-scheduling result effective time is set, and the larger pre-scheduling result effective time ensures that the pre-scheduling result is Interact between X2 ports.

FIG. 1 is a schematic diagram of an application scenario of downlink multi-cell coordinated transmission. As shown in the figure, multiple cells that are cooperatively transmitted may be different cells under the same eNodeB (eg, the coordinated cells Cell1 and Cdl2 of UE1 and UE2 in the virtual circle, all belong to eNodeBl). The multi-cell cooperative mode is called intra-eNodeB CoMP; the coordinated multiple cells may also be cells under different eNodeBs (such as UE3 and UE4 co-cells Cdl3 and Cdl4 in the real coil, respectively belonging to eNodeB2 and eNodeB3). This multi-cell cooperative mode is called inter-eNodeB CoMP.

Embodiment 1

As shown in FIG. 2, this embodiment is a schematic diagram of intra-eNodeB CoMP transmission in the LTE system. Both Celll and Cdl2 belong to the eNodeB1, and each cell has a bandwidth of 5M, corresponding to 25 resource blocks (RB, Resources Block, which are resources in the LTE system). Distribution unit) ₀

First, Celll sends a signal strength measurement request to all users (including the list of cells and measured values to be measured, the measured value is RSRP/RSRQ or any amount that can characterize the transmitted signal strength of the cell), and Celll receives the measurement result reported by each user. After comparing with the preset threshold, the UE1 is determined to be the edge user of the Cel1, and the measurement result of the UE1 is compared with the preset threshold 2 to determine the coordinated cell set of the UE1. The Cell2 performs the same processing as the Cell1, and determines that the UE2 is the Cell2. Edge users, and get a coordinated cell set of UE2;

The preset threshold may be the result of the system simulation or the empirical value, and Celll finally determines that Cdl2 is the coordinated cell of UE1; similarly, Cell2 finally determines that Celll is the coordinated cell of UE2;

Celll and Cell2 respectively send channel feedback requests to UE1 and UE2, respectively, including the coordinated cell list of UE1 and UE2. UE1 then feeds back the estimated values of channels H11, H12 to Celll; UE2 feeds back the estimated values of channels H21, H22 to Cdl2.

Step 2: The scheduling process of the edge UE is as shown in FIG. 5. After receiving the full bandwidth channels H11 and H12 fed back by the current scheduling user UE1, the Cell1 receives the cell related information (such as the cell ID) carried in the channel information. Determining that the channel information belongs to the same eNodeB; Celll pre-scheduling UE1 to allocate 10 consecutive RBs of index 6 to index 15 for UE1 (the resource allocation principle may be equally distributed according to the number of UEs or allocated according to the actual traffic volume;) ;

After receiving the full bandwidth channels H21 and H22 fed back by the UE2, the Cell2 determines that the channel information belongs to the same eNodeB according to the cell related information (such as the cell ID) carried in the channel information; Cdl2 pre-arranges the UE2 to the UE2. The consecutive 10 RBs of the index 6 to the index 15; since the UE feedback channels of the Celll and the Cell 2 belong to the same eNodeB, the interaction information can be obtained from the shared storage area of the eNodeB1, and the delay is small, and the pre-scheduling result of the UE1 and the UE2 can be set. Smaller (such as 3ms), greater than the scheduling period (in the LTE system, the subframe is the scheduling period, lms);

Celll obtains the UE2 pre-scheduling information of Cell2 and H21 from the shared storage area of the eNodeB1, compares the pre-scheduling information of UE1 and UE2, finds that the resources overlap on the RB index 6~index 15, and utilizes the information leakage ratio (SLNR) at the position where the resources overlap. The Signal to Leakage Noise Ratio criterion is used to calculate the precoding vector of each RB, and the corresponding precoding vector is determined according to the Precoding Matrix Indicator (PMI) fed back by the UE1 on the RBs whose resources do not overlap, and then the pre-scheduling of the UE1 is saved. a result and a precoding vector corresponding to the allocated RB;

The formula for obtaining a precoding vector using the letter to noise ratio criterion is as follows: W _; = eig R eig {R]

Where ^m ' represents the feature vector corresponding to the first ^m ' maximum eigenvalues of the matrix R; represents the number of layers used by the UE in the ''cells; ^R 〗〖, ^{R = Η} 3⁄4 , ^Η '· . '· indicates the channel of the serving cell to the UE, ^Η "represents the coordinated cell] to the channel of the UE, "I represents the noise received by the UE.

The idea of the signal leakage ratio criterion is to minimize the signal power leakage from the serving cell to the neighboring cell, thereby reducing the co-channel interference to the neighboring cell users. In the present invention, only when the serving cell and the coordinated cell use the same frequency resource to transmit data. Use this criterion to obtain a precoding vector for the corresponding location.

Similarly, Cell2 obtains the UE1 pre-scheduling information of the Cdll and the H12 from the shared storage area of the eNodeB1, compares the pre-scheduled information of the UE1 and the UE2, and finds that the resources overlap on the RB index 6 to the index 15, and obtains the RBs by using the SLNR criterion at the position where the resources overlap. Precoding vector, determining a corresponding precoding vector according to a precoding matrix indication PMI fed back by the UE2 on an RB whose resources do not overlap, and then storing a pre-scheduling result of the UE2 and a precoding vector corresponding to the allocated RB;

The scheduling process of the central UE is as shown in FIG. 6. At the scheduling time T+3, the pre-scheduling results of UE1 and UE2 are valid, and the Cdll sends the scheduling result of UE1 and sets the state of RB index 6~index 15 to be used, and then Allocating resources to the central UE scheduled for this moment on RB index 0~index 5 and RB index 16~index 24;

Similarly, the scheduling result of UE2 is sent by Cdl2, and the state of RB index 6~index 15 is set to be used, and then resources are allocated on the center UE scheduled for this moment on RB index 0~index 5 and RB index 16~index 24.

In the embodiment of the present invention, Cell1 and Cell2 use the SLNR criterion to obtain a precoding vector to perform beam assignment on the transmission data at the resource overlap position RB index 6 to index 15, thereby reducing co-channel interference to the edge user of the coordinated cell, and improving The performance of the cell edge user.

Embodiment 2 As shown in FIG. 3, it is a schematic diagram of inter-eNodeB CoMP transmission in an LTE system according to an embodiment of the present invention. Cdl3 and Cdl4 belong to eNodeB2 and eNodeB3, respectively, and each cell has a bandwidth of 5M, corresponding to 25 RBs.

First, Cdl3 sends a signal strength measurement request to all users (including the list of cells and measured values to be measured, the measured value is RSRP/RSRQ or any amount that can characterize the transmitted signal strength of the cell), and Cell3 receives the measurement result reported by each user. After determining the UE3 as the edge user of the Cdl3, the UE3 is compared with the preset threshold 2 to determine the coordinated cell set of the UE3. The Cell4 performs the same processing as the Cell3, and determines that the UE4 is the edge of the Cell4. User, and obtain a coordinated cell set of UE4;

The preset threshold may be the result of the system simulation or the empirical value, and Cell3 finally determines that Cdl4 is the coordinated cell of UE3; similarly, Cell4 finally determines that Cdl3 is the coordinated cell of UE4;

Cell3 and Cell4 respectively send channel feedback requests to UE3 and UE4, respectively, including the coordinated cell list of UE3 and UE4. UE3 then feeds back the estimated values of channels H33, H34 to Cell3; UE4 feeds back the estimated values of channels H43, H44 to Cdl4.

Step 2: The scheduling process of the edge UE is as shown in FIG. 5. At the scheduling time T, the Cell3 receives the full bandwidth channels H33 and H34 fed back by the current scheduling user UE3, and determines according to the cell related information (such as the cell ID) carried in the channel information. The channel information belongs to different eNodeBs; Cell3 pre-schedules UE3 to allocate 8 consecutive RBs of index 0 to index 7 for UE3 (the resource allocation principle may be equally distributed according to the number of UEs or allocated according to the actual traffic volume;);

Similarly, Cell4 receives the full-bandwidth channels H43 and H44 fed back by UE4, and determines that the channel information belongs to different eNodeBs according to cell-related information (such as cell ID) carried in the channel information; Cell4 pre-schedules UE4 to allocate index 0 to UE4. ~ consecutive 5 RBs of index 5;

Since the UE feedback channels of Cell3 and Cdl4 belong to different eNodeBs, the information must be exchanged through the X2 interface. Considering the delay on X2, the UE3 and UE4 pre-scheduling results can be set to a larger time (such as 20ms) to ensure pre-scheduling. Before the results take effect, the collaborative cells can be To receive mutual interaction information;

Cell3 receives the UE4 pre-scheduling information and H43 exchanged by Cell4 through the X2 interface, compares the pre-scheduled information of UE3 and UE4, finds that the resources overlap on the RB index 0~index 5, and obtains the pre-array of each RB by using the SLNR criterion at the position where the resources overlap. Encoding vector, determining a corresponding precoding vector according to a precoding matrix indicated by the UE3, and then preserving a precoding result of the UE3 and a precoding vector corresponding to the allocated RB;

Similarly, Cdl4 receives the UE3 pre-scheduling information and H34 exchanged by Cdl3 through the X2 interface, compares the pre-scheduling information of UE3 and UE4, finds that the resources overlap on the RB index 0~index 5, and obtains the RBs by using the SLNR criterion at the position where the resources overlap. Precoding vector, determining a corresponding precoding vector according to a precoding matrix indication PMI fed back by the UE4 on the RBs whose resources do not overlap, and then preserving the pre-scheduling result of the UE4 and the precoding vector corresponding to the allocated RB;

The scheduling process of the central UE is as shown in FIG. 6. At the scheduling time T+20, the pre-scheduling results of UE3 and UE4 are valid, and the scheduling result of UE3 is sent by Cell3, and the state of RB index 0~index 7 is set to be used, and then The RB index 8~ index 24 allocates resources to the central UE scheduled for this moment; likewise, the scheduling result of the UE4 is sent by the UE4, and the state of the RB index 0~index 5 is set to be used, and then the RB index 6~ index 24 is The central UE scheduled at the moment allocates resources.

In the embodiment of the present invention, Cdl3 and Cell4 use the SLNR criterion to obtain a precoding vector to perform beam assignment on the transmission data at the resource overlap position RB index 0 to index 5, thereby reducing co-channel interference to the edge user of the coordinated cell, and improving The performance of the cell edge user.

According to an embodiment of the present invention, a scheduling system for cooperative transmission is provided. As shown in FIG. 7, the scheduling system includes: a scheduling module 2 and an execution module 4. The foregoing results are described in detail below.

The scheduling module 2 is located in the eNodeB, and is used to complete the scheduling of the edge user and the central user in the serving cell. The execution module 4 is connected to the scheduling module 2, and is located in the UE, and is used to measure the measurement information and the measurement information scheduled by the user. Feedback to the serving cell.

Preferably, as shown in FIG. 8, in the scheduling system, the scheduling module 2 further includes: a user a grouping unit 21, a coordination set determining unit 22, a data receiving unit 23, a resource scheduling unit 24, an information interaction unit 25, a precoding unit 26, and a downlink transmitting unit 27;

a user grouping unit 21, configured to divide users in the serving cell into a cell edge user and a cell center user;

a cooperative set determining unit 22, configured to determine, by the serving cell, a coordinated cell of the edge user, and a data receiving unit 23, configured to receive, by the serving cell, the channel information resource scheduling unit 24 that is fed back by the edge user, where Pre-scheduling of the serving cell to the edge user and scheduling processing for the central user;

The information interaction unit 25 is configured to use scheduling results and channel information required for interaction between the serving cell and the coordinated cells.

a precoding calculation unit 26, configured to calculate, by the serving cell, a precoding vector for processing the data to be sent;

The downlink sending unit 27 is configured to send, by the serving cell, scheduling result information of the user. The execution module 4 further includes: a measuring unit 41 and a feedback unit 42; wherein

The measuring unit 41 is configured to perform, by the user in the serving cell, a measurement request of the serving cell, and the feedback unit 42 is used by the user in the serving cell to feed back a corresponding measurement result to the serving cell.

From the above description, it can be seen that the following technical effects are achieved: the user in the serving cell is distinguished, and the edge UE in the serving cell is scheduled with the coordinated cell, so that the co-channel interference of the cell edge UE is reduced. Thereby, the throughput of the cell edge UE is improved, and the average throughput of the entire cell is further improved.

Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they can be executed by computing devices The program code of the lines is implemented so that they can be stored in the storage device by the computing device, and in some cases, the steps shown or described can be performed in a different order than here, or they can be Each of the integrated circuit modules is fabricated separately, or a plurality of modules or steps thereof are fabricated into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

Claim

A scheduling method for cooperative transmission, characterized in that the method comprises:

The serving cell divides the users in the serving cell into a central user and an edge user, and determines a coordinated cell of the edge user;

The serving cell and the coordinated cell jointly perform the coordinated scheduling of the edge users in the serving cell, and complete the scheduling of the central user in the serving cell in the remaining resources of the serving cell.

The method according to claim 1, wherein the serving cell divides the users in the serving cell into a central user and an edge user, and determines that the coordinated cell of the edge user is: the serving cell All users in the serving cell send a signal strength measurement request; all users in the serving cell report the measurement result to the serving cell; the serving cell compares the measurement result with a preset threshold, and the service is compared All the users in the cell are divided into edge users and central users, and the measurement results of the edge users are compared with the preset thresholds 2 to determine the coordinated cells of the edge users.

3. The method of claim 2, wherein

The signal strength measurement request includes a neighbor cell list and a measurement value that the edge user needs to measure; the neighbor cell list is specified by a serving cell; the measurement value includes a reference signal received power RSRP, and/or a reference signal is received. Quality RSRQ, and/or any amount that characterizes the transmitted signal strength of the serving cell;

The preset threshold is determined by system simulation or takes an empirical value.

The method according to claim 2, wherein, after the serving cell determines a coordinated cell of all edge users in the serving cell, the method further includes:

The serving cell sends a channel feedback request to the edge user, and the edge user reports the channel information of the coordinated cell to the serving cell according to the channel feedback request, and the serving cell performs channel information of the coordinated cell. classification.

5. The method of claim 4 wherein: The channel feedback request includes coordinated cell information of the edge user;

The serving cell classifies the channel information of the coordinated cell according to the cell ID included in the channel information, and divides the channel information into the same eNodeB and different eNodeBs.

The method according to claim 1, wherein the serving cell and the coordinated cell jointly perform cooperative scheduling of an edge user in the serving cell, and complete a serving cell in remaining resources of the serving cell. The inner center user schedule is:

The method according to claim 6, wherein the setting time of the pre-scheduling result is:

If the channel information fed back by the edge user belongs to the same eNodeB, set a smaller pre-scheduling result effective time, and the smaller pre-scheduling result effective time is greater than the scheduling period; if the edge information fed back by the edge user is partially All of the different pre-scheduled results take effect, and the larger pre-scheduled result effective time ensures that the pre-scheduled result and the channel information interact between the X2 interfaces.

8. A scheduling system for cooperative transmission, characterized in that the system comprises:

a scheduling module, configured to complete scheduling of edge users and central users in the serving cell; And an execution module, configured to measure measurement information of the user scheduling and feedback of the measurement information to the serving cell.

The system according to claim 8, wherein the scheduling module further comprises: a user grouping unit, wherein the serving cell divides the user into a cell edge user and a cell center user;

a coordination set determining unit, configured to determine, by the serving cell, a coordinated cell of the edge user, a data receiving unit, configured to receive, by the serving cell, channel information that is fed back by the edge user, and a resource scheduling unit, configured to be used by the serving cell Pre-scheduling for edge users and scheduling processing for central users;

An information interaction unit, configured to perform scheduling and channel information required for interaction between the serving cell and the coordinated cells;

a precoding unit, configured to obtain, by the serving cell, a precoding vector for processing the data to be sent;

And a downlink sending unit, configured to send, by the serving cell, scheduling result information of the user.

The system according to claim 8, wherein the execution module further comprises: a measurement unit, configured to perform, by the user in the serving cell, a measurement request of the serving cell; a feedback unit, configured to use the service The user in the cell feeds back the corresponding measurement result to the serving cell.