WO2014139121A1 - Method for scheduling user equipment and base station - Google Patents

Method for scheduling user equipment and base station Download PDF

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Publication number
WO2014139121A1
WO2014139121A1 PCT/CN2013/072601 CN2013072601W WO2014139121A1 WO 2014139121 A1 WO2014139121 A1 WO 2014139121A1 CN 2013072601 W CN2013072601 W CN 2013072601W WO 2014139121 A1 WO2014139121 A1 WO 2014139121A1
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WO
WIPO (PCT)
Prior art keywords
cell
user equipment
noise power
interference noise
downlink data
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PCT/CN2013/072601
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French (fr)
Chinese (zh)
Inventor
李琦
辛嘉鹏
李小捷
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2013/072601 priority Critical patent/WO2014139121A1/en
Publication of WO2014139121A1 publication Critical patent/WO2014139121A1/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/04Wireless resource allocation

Abstract

The present invention relates to the technical field of communications. Disclosed are a method for scheduling a user equipment and a base station. In a technical solution provided by the present invention, when determining a modulation and coding scheme (MCS), a base station side can both consider interference produced by other cells in a measurement cell set to a downlink channel of a serving cell, and channel estimation performed by the base station side on the downlink channel according to uplink channel information, thereby improving accuracy of scheduling of the user equipment by the base station.

Description

 Method and base station for scheduling user equipment

 The present invention relates to the field of communications technologies, and in particular, to a method and a base station for scheduling user equipment.

Background technique

 The Long Term Evolution (LTE) system supports Frequency Division Duplexing (FDD) and Time Division Duplexing (TDD). In the LTE-TDD system supporting TDD, the uplink and downlink Occupying the same frequency band, it depends on time to distinguish between uplink and downlink. That is to say, one feature of this system is that the uplink and downlink channels occupy the same frequency band. Therefore, the uplink and downlink channels can be considered to be approximately the same. This is called "uplink and downlink reciprocity." ". According to this feature, in the LTE-TDD system, the UE transmits a Sounding Reference Signal (SRS) signal according to a certain rule to "detect" the uplink channel, and the evolved Node B (eNB) can The SRS performs channel estimation to obtain information of the uplink channel, and determines the downlink channel according to the information of the uplink channel. In order to better estimate the downlink channel, the base station side also needs the user equipment to feed back a Channel Quality Indicator (CQI). When calculating the CQI, the user equipment needs to presuppose the transmission mode of the downlink data on the base station side, and then calculate the CQI according to the assumed transmission mode and feed back to the base station. After receiving the CQI sent by the user equipment, the base station performs calculation according to the CQI, and allocates resources to the user equipment according to the calculation result to implement scheduling of the user equipment.

 In the process of implementing the scheduling of the user equipment by the base station, the transmission mode of the downlink data actually used by the base station side is different from the transmission mode assumed by the user equipment, so that the base station side may incorrectly estimate the downlink channel according to the inaccurate CQI, thereby The allocation accuracy of the transmission resources of the base station is affected, and the efficiency of the base station scheduling user equipment is reduced or the resources are wasted.

Summary of the invention

Embodiments of the present invention provide a method and a base station for scheduling user equipment, which improve base station usage. The accuracy of the device scheduling.

 In order to achieve the above object, embodiments of the present invention use the following technical solutions:

 In a first aspect, the present invention provides a method for scheduling a user equipment, including:

 Obtaining uplink channel information of each user equipment in the serving cell of the user equipment to be scheduled, where the serving cell belongs to a measurement cell set, and the measurement cell set further includes at least one coordinated cell;

 Determining, according to the uplink channel information and scheduling information of the at least one coordinated cell, a modulation and coding scheme MCS required for scheduling;

 And allocating transmission resources to the to-be-scheduled user equipment according to the M C S .

 With reference to the first aspect, in a first possible implementation manner, a scheduling sequence is performed between all cells in the measurement cell set, and

 If the at least one coordinated cell includes a scheduled cell in a scheduling order before the serving cell, the scheduling information of the scheduled cell includes the transmission weight of the last scheduled user equipment on each subband of the scheduled cell. And transmit power; and/or

 If the at least one coordinated cell includes an unscheduled cell whose scheduling order is after the serving cell, the scheduling information of the unscheduled cell includes the transmit power of the user equipment last time on each subband of the unscheduled cell.

 With reference to the first aspect, or the first possible implementation manner of the first aspect, in the second possible implementation manner, the uplink channel information is

 All cells in the measurement cell set are measured by detecting a sounding reference signal SRS transmitted by each user equipment in the serving cell.

 With reference to the first aspect, or the first or second possible implementation manner of the first aspect, in the third possible implementation, the determining the MCS required for scheduling includes:

 Determining downlink channel information of each user equipment according to the uplink channel information and scheduling information of the at least one coordinated cell, where downlink channel information of each user equipment includes a message of the user equipment on each subband Dry noise ratio

 Determining user equipment pre-adjusted on the respective sub-bands according to the downlink channel information of each user equipment;

Merging the signal to interference and noise ratio on the first subband, wherein the presetting on the first subband The user equipment of the degree is the user equipment to be scheduled;

 The MCS is determined based on the combined signal to interference and noise ratio.

 With reference to the third possible implementation manner of the first aspect, in a fourth possible implementation manner, after determining the user equipment that is pre-scheduled on the each sub-band, the method further includes:

 Determining, by the serving cell, scheduling a transmission weight and a transmission power of the pre-scheduled user equipment on each sub-band;

 The determined transmit weight and/or transmit power is transmitted to some or all of the at least one coordinated cell within the set of measurement cells.

 With reference to the fourth possible implementation manner of the first aspect, in a fifth possible implementation, the determining, by using the determined transmit weight and/or transmit power, the at least one coordinated cell in the measurement cell set Part or all of, including:

 If there is one or more unscheduled cells whose scheduling order is after the serving cell, the serving cell transmits the determined transmission weight and transmission power to all unscheduled cells; or

 If there is one or more unscheduled cells whose scheduling order is after the serving cell, the serving cell sends the determined transmission weight and the transmit power to the unscheduled cell immediately following the scheduling sequence; or

 If there is no unscheduled cell whose scheduling order is after the serving cell, the serving cell transmits the determined transmit power to all cooperating cells.

 With reference to the third or fourth or the fifth possible implementation of the first aspect, in the sixth possible implementation, the determining, by the user equipment, the downlink channel information includes:

 Establishing, respectively, a corresponding interference noise power matrix for each user equipment, where the interference noise power matrix is used to represent interference noise power corresponding to all downlink data streams sent by the cell in the measurement cell set to the user equipment;

 Calculating, according to the interference noise power matrix, the uplink channel information, and the scheduling information of the at least one coordinated cell, respectively, obtaining cells in a transmit cell set corresponding to each user equipment on each subband of the serving cell The signal to interference and noise ratio corresponding to the downlink data stream transmitted to the user equipment, respectively, and generating downlink channel information.

In combination with the sixth possible implementation of the first aspect, in a seventh possible implementation The establishing, by each user equipment, a corresponding interference noise power matrix includes: receiving CQI information sent by each user equipment;

 Performing calculation according to the CQI information, and obtaining interference noise power generated by the measurement cell set outer cell on the virtual downlink data stream fed back by each user equipment;

 For the virtual downlink data stream fed back by each user equipment, the interference noise power generated by the measurement cell set out-of-cell is averaged, and the average value of the interference noise power is obtained as all downlink data streams in the serving cell. Interference noise power;

 A corresponding interference noise power matrix is established for each user equipment according to the interference noise power on all downlink data streams in the serving cell.

 With reference to the sixth possible implementation manner of the foregoing aspect, in the eighth possible implementation, the determining, by the user equipment, the corresponding interference noise power matrix includes:

 Receiving CQI information sent by each user equipment;

 Performing calculation according to the CQI information, and obtaining interference noise power generated by the measurement cell set outer cell on the virtual downlink data stream fed back by each user equipment;

 Determining the interference noise power generated by the cell outside the measurement cell set on each virtual downlink data stream fed back by the user equipment, when the number of the downlink data flows that are fed back by the user equipment is the same as the number of the downlink data flows in the serving cell Interference noise power generated by the outer cell of the measurement cell set on each downlink data stream in the serving cell;

 And correspondingly generating an interference noise power matrix for each user equipment according to the interference noise power generated by the outer cell of the measurement cell set on all downlink data flows in the serving cell.

 With reference to the sixth possible implementation manner of the foregoing aspect, in the ninth possible implementation manner, the determining, by the user device, the corresponding interference noise power matrix includes:

 Obtaining interference noise power generated by the small cells in the measurement cell set on all downlink data flows in the serving cell;

Calculating, according to the interference ratio coefficient, the acquired interference noise power generated by the cells in the measurement cell set on all downlink data flows in the serving cell, to obtain the downlink data flow in the serving cell Measuring interference noise power generated by a cell outside the cell set; Establishing a corresponding interference noise power matrix for each user equipment according to the interference noise power generated by the measurement cell outside the cell on all the downlink data streams in the serving cell.

 In a second aspect, the present invention provides a base station, including:

 An acquiring unit, configured to acquire uplink channel information of each user equipment in a serving cell of the user equipment to be scheduled, where the serving cell belongs to a measurement cell set, and the measurement cell set further includes at least one coordinated cell;

 a first determining unit, configured to determine, according to the uplink channel information acquired by the acquiring unit and the scheduling information of the at least one coordinated cell, a modulation and coding scheme MCS required for scheduling, and an allocation unit, configured to use, according to the first Determining, by the unit, the MCS, to allocate a transmission resource to the to-be-scheduled user equipment.

 With reference to the second aspect, in a first possible implementation manner, a scheduling sequence is performed between all cells in the measurement cell set, and

 If the at least one coordinated cell includes a scheduled cell in a scheduling order before the serving cell, the scheduling information of the scheduled cell includes the transmission weight of the last scheduled user equipment on each subband of the scheduled cell. And transmit power; and/or

 If the at least one coordinated cell includes an unscheduled cell whose scheduling order is after the serving cell, the scheduling information of the unscheduled cell includes the transmit power of the user equipment last time on each subband of the unscheduled cell.

 With reference to the second aspect, or the first possible implementation manner of the second aspect, in a second possible implementation manner, the uplink channel information is that all cells in the measurement cell set are in the serving cell The sounding reference signal SRS transmitted by each user equipment is measured.

 With reference to the second aspect, or the first or second possible implementation manner of the second aspect, in the third possible implementation manner, the first determining unit includes:

 a first determining module, configured to determine downlink channel information of each user equipment according to the uplink channel information acquired by the acquiring unit and scheduling information of the at least one coordinated cell, where the downlink of each user equipment is The channel information includes a signal to interference and noise ratio of the user equipment on each subband;

a second determining module, configured to determine, according to the first determining module, each user equipment The downlink channel information, the user equipment pre-scheduled on the respective sub-bands is determined; the merging module is configured to use the information on the first sub-band in the signal-to-interference ratio in each sub-band determined by the first determining module And performing a merging process, wherein the pre-scheduled user equipment determined by the second determining module is a sub-band of the to-be-scheduled user equipment, and is the first sub-band;

 Determining the MCS according to a signal to interference and noise ratio obtained by combining the merged modules. With reference to the third possible implementation of the second aspect, in a fourth possible implementation, the base station further includes:

 a second determining unit, configured to determine, by the serving cell, a transmit weight and a transmit power of the pre-scheduled user equipment on each sub-band;

 And a sending unit, configured to send the transmission weight and/or the transmission power determined by the second determining unit to part or all of the at least one coordinated cell in the measurement cell set.

 In combination with the fourth possible implementation of the second aspect, in a fifth possible implementation

When the cell is not scheduled, the determined transmission weight and the transmission power are sent to all unscheduled cells; or when the plurality of unscheduled cells are sent, the determined transmission weight and the transmission power are sent to the following scheduling sequence. Scheduling a cell; when scheduling a cell, transmitting the determined transmit power to all coordinated cells.

 With reference to the third or fourth or fifth possible implementation of the second aspect, in a sixth possible implementation, the first determining module includes:

 a matrix establishment sub-module, configured to respectively establish a corresponding interference noise power matrix for each user equipment, where the interference noise power matrix is used to represent interference noise corresponding to all downlink data streams sent by the cell in the measurement cell set to the user equipment Power

a calculation submodule, configured to calculate, according to the interference noise power matrix established by the matrix establishment submodule, the uplink channel information, and the scheduling information of the at least one coordinated cell, respectively, to obtain a transmitting cell corresponding to each user equipment a signal to interference and noise ratio corresponding to a downlink data stream respectively transmitted by the cell in the set to the user equipment on each subband of the serving cell, and generated Line channel information.

 With reference to the sixth possible implementation manner of the second aspect, in a seventh possible implementation, the matrix establishing submodule is configured to receive CQI information sent by each user equipment, and perform calculation according to the CQI information. Obtaining interference noise power generated by the measurement cell set external cell on the virtual downlink data stream fed back by each user equipment; for the virtual downlink data stream fed back by each user equipment, by the measurement cell set outer cell The generated interference noise power is averaged, and the average value of the interference noise power is used as the interference noise power on all downlink data streams in the serving cell; according to the interference noise power on all downlink data streams in the serving cell, Each user equipment establishes a corresponding interference noise power matrix.

 With reference to the sixth possible implementation of the second aspect, in an eighth possible implementation, the matrix establishing submodule is configured to receive CQI information sent by each user equipment, and perform calculation according to the CQI information. Obtaining interference noise power generated by the cell outside the measurement cell set on the virtual downlink data stream fed back by each user equipment; when the virtual downlink data stream fed back by the user equipment is compared with the number of downlink data flows in the serving cell At the same time, the interference noise power generated by the measurement cell out-of-set cell on each virtual downlink data stream fed back by the user equipment is determined as being generated by the measurement cell out-of-band cell on each downlink data stream in the serving cell. Interference noise power; respectively, according to the interference noise power generated by the cells outside the measurement cell set on all downlink data flows in the serving cell, respectively, respectively, corresponding interference noise power matrices are established for each user equipment.

 With reference to the sixth possible implementation manner of the second aspect, in a ninth possible implementation manner, the matrix establishing submodule is configured to obtain, by using, the measurement cell set on all downlink data flows in the serving cell The interference noise power generated by the cell is calculated according to the interference ratio coefficient and the obtained interference noise power generated by the cells in the measurement cell set on all downlink data streams in the serving cell, and all downlinks in the serving cell are obtained. The interference noise power generated by the outer cell of the measurement cell set on the data stream; the interference noise power generated by the outer cell of the measurement cell set on all downlink data flows in the serving cell, respectively, for each user equipment Establish a corresponding interference noise power matrix.

In a method and a base station for scheduling a user equipment according to an embodiment of the present invention, each of the foregoing is determined by using the uplink channel information and scheduling information of the at least one coordinated cell. The downlink channel information of the user equipment, so that the base station side can consider both the interference generated by the other cells in the measurement cell set to the downlink channel of the serving cell, and the channel estimation performed by the base station side according to the uplink channel information. The accuracy of the scheduling of the user equipment by the base station is improved, and the downlink channel estimation information reported by the user equipment side is avoided to determine an error that may occur in the MCS.

DRAWINGS

 In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

 1 is a flow chart of a method for scheduling user equipment provided by a prior art related to the present invention;

 2 is a flowchart of a method for scheduling a user equipment according to an embodiment of the present invention; FIG. 3 is a flowchart of another method for scheduling a user equipment according to an embodiment of the present invention; FIG. 5 is a flowchart of another method for scheduling user equipment according to an embodiment of the present invention; FIG. 6 is a flowchart of another method for scheduling user equipment according to an embodiment of the present invention; 7 is a flowchart of another method for scheduling user equipment according to an embodiment of the present invention; FIG. 8 is a flowchart of another method for scheduling user equipment according to an embodiment of the present invention; FIG. 9 is another embodiment of the present invention. A flowchart of a method for scheduling a user equipment; FIG. 10 is a block diagram of a base station according to an embodiment of the present invention;

 FIG. 11 is a structural block diagram of another base station according to an embodiment of the present invention;

 FIG. 12 is a structural block diagram of another base station according to an embodiment of the present invention;

 FIG. 13 is a structural block diagram of another base station according to an embodiment of the present invention;

 FIG. 14 is a structural block diagram of another base station according to an embodiment of the present invention;

 FIG. 15 is a structural block diagram of another base station according to an embodiment of the present invention.

detailed description

The technical solution in the embodiment of the present invention will be further described below with reference to the accompanying drawings in the embodiments of the present invention. The invention is described in a clear and complete manner, and it is obvious that the described embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

First, the meaning of the measurement cell set and the transmission cell set involved in the following embodiments will be explained. The cells within the measurement cell set can receive and process the SRS transmitted by the user equipment, and can measure information interactively. The following assumes that the measurement cell set of the user equipment to be scheduled includes M cells, the set is μ Μ , and the cell number in the measurement cell set is = l, 2, · · · , .

The maintenance of the measurement of the set of cells: a method of fixed allocation may be used, for example, several cells around the serving cell of the user equipment to be scheduled to form a measurement cell set; or the reference signal of each cell fed back by the user equipment to be scheduled may receive power ( Reference Signal Receiving Power (RSRP) selects M measurement set cells according to |RS -RSRP j | < 73⁄4r, where RSRI is the RSRP of the serving cell, RS is the RSRP of other cells, and 73⁄4r is the threshold. Of course, other methods of maintaining the set of measured cells can also be used.

 The meaning of the set of transmitting cells is explained again: the cells in the transmitting cell set jointly transmit downlink data for the to-be-scheduled user equipment, and the cells in the transmitting cell set are necessarily in the measured cell set. There are many methods for joint launch, which are generally divided into two categories: coherent emission and incoherent emission. The coherent transmission needs to transmit the cell interaction channel information in the cell set to calculate the transmission weight; the non-coherent transmission only needs to calculate the transmission weight separately for each cell. It is assumed hereinafter that the target UE's transmit cell set is one cell (Γ ≤ Μ ) and the transmit cell set is ^.

 Please refer to FIG. 1 , which is a schematic diagram of a method for scheduling a user equipment. As shown in Figure 1, in the existing scheduling method, each cell performs scheduling independently, and the base station where the cell 1 is located is the execution subject. The specific scheduling process is as follows:

 101: Calculate a corresponding modulation coding scheme (MCS) according to the CQI fed back by the user equipment, to adapt to a channel environment of the wireless link.

 102: Allocating transmission resources to the user equipment; when allocating, the transmission resources of the user equipment may be comprehensively determined according to the MCS of the user equipment and the historical transmission rate, for example, a proportional fair algorithm (PF) may be used, or a polling (RR) may be used. The algorithm allocates transmission resources of the user equipment.

103 : transmitting data for the user equipment on the allocated resources; allocating funds for the user equipment After the source, the transport block size (TBS) is determined according to the MCS, and then the data is transmitted for the user equipment according to the determined transport block size, where the transport block size is the amount of data that can be transmitted when the user equipment data is at a certain error rate. .

 The process steps of the cell 2 to the cell N are also included in FIG. 1 , and the process steps of each cell are the same as those of the cell 1 , and details are not described herein again.

 As described in the background section, the current scheduling method cannot accurately calculate the transmission block size because the CQI fed back by the user equipment cannot accurately represent the quality of the downlink channel. When the transport block is too small, although the error rate is reduced, the transmission resources are wasted; when the transport block is too large, the error rate is raised and the transmission efficiency is lowered. Therefore, it will bring some loss to the system performance.

 In addition, since the cells are independently scheduled, the interference situation when the data is scheduled to be transmitted cannot be obtained, so the signal to Interference plus Noise Ratio (SINR) of the scheduled user equipment cannot be accurately calculated. The following is referred to as the signal to interference and noise ratio, so that the calculation of the MCS may be inaccurate, which in turn affects the accuracy of the scheduling.

 Considering the above technical problem, the embodiment of the present invention provides a method for scheduling a user equipment, where each cell in the measurement cell set is scheduled according to a certain order, and after each cell determines the user equipment and scheduling information scheduled on the sub-band, The scheduling information is shared to other cells, so that the cells that are scheduled later can more accurately determine the interference situation when transmitting data, thereby determining the MCS and improving the scheduling accuracy.

 Specifically, please refer to FIG. 2 , which is a schematic diagram of a method for scheduling user equipment according to an embodiment of the present invention. In this embodiment, the measurement cell set includes cell 1 to cell N, and the scheduling order is from cell 1 to cell N, and scheduling is performed in sequence. All cells complete scheduling, which is called completing one round of scheduling for the measurement cell set. As shown in Figure 2, the base station where the cell 1 is located is the execution subject, and the scheduling process is as follows:

 201: Determine, according to the uplink channel information of each user equipment in the currently scheduled cell 1 and the scheduling information of the latest scheduling of other cells in the measurement cell set (ie, other cells except the currently scheduled cell), determine the scheduling station. The required MCS.

The scheduling information of the last scheduling corresponding to the cell 2 to the cell N is the scheduling information used in the last round scheduling. The uplink channel information may be an uplink channel matrix, and may be obtained by channel estimation of the SRS. For example, all the cells in the measurement cell set measure the SRS transmitted by each user equipment in the currently scheduled cell, and obtain the uplink channel information of each user equipment.

 202: Send scheduling information to other cells in the measurement cell set.

 It should be noted that, in this embodiment, the transmission mode is not limited, and may be a delivery manner. For example, the cell 1 sends scheduling information to the cell 2, and the cell 2 sends the scheduling information of the cell 1 and the cell 2 to the cell 3, and sequentially, until The cell N-1 transmits the scheduling information of the cell 1 to the cell N-1 to the cell N. After the cell N completes the scheduling, the scheduling information of all the cells is sent out for use in the next round of scheduling. In the scheduling of the measurement cell set in each round, each of the cells that complete the scheduling sends the scheduling information to the cell that does not complete the scheduling, for example, the cell 1 sends the scheduling information to the cell 2 to the cell N, and the cell 2 transmits the scheduling information. The information is sent to the cell 3 to the cell N. After the cell N completes the scheduling, the scheduling information is sent out. The scheduling information sent by the cell 2 to the cell N can also be used for the next round of scheduling. Of course, other methods, such as every other delivery scheduling information, may be used, and the implementation does not impose any restrictions.

 The method flow as shown in Figure 2 includes one of the above described delivery methods.

 203: Allocate transmission resources for the user equipment scheduled for the determined MCS.

 204 : Transmit data for the user equipment on the allocated resources.

 It should be noted that the order between the foregoing step 202 and the step 203 or 204 is not limited, and may be performed simultaneously, or after step 203 or 204, or between steps 203 and 204. Do not make any restrictions.

 Referring to FIG. 2, in each scheduling, the cell 1 to the cell N repeat the above steps to complete the respective scheduling of the user equipment. In step 201, the cell 1 determines the MCS required for scheduling according to the scheduling information in the round scheduling of the cell 2 to the cell N; the cell 2 according to the uplink channel information of each user equipment in the cell, and the current round scheduling of the cell 1 The scheduling information and the scheduling information in the round scheduling of the cell 3 to the cell N determine the MCS required for the scheduling; and so on, the cell N determines the MCS required for the scheduling according to the scheduling information in the current round scheduling of the cell 1 to the cell N-1.

It should be noted that the scheduling order of the cell 1 to the cell N may be sorted according to a predefined order or rule, for example, each time in a fixed order, or each time according to the polling Order and so on.

 The above embodiment considers the influence of other cells on the downlink channel of the serving cell, and combines the estimation of the downlink channel by the base station side to improve the accuracy of the scheduling of the user equipment by the base station, and avoids the downlink channel estimation reported by the user equipment side only. Information to determine possible errors in the MCS.

 With reference to FIG. 3, it is a flowchart of a method for scheduling a user equipment according to an embodiment of the present invention. As shown in FIG. 3, the method may be implemented by a base station side in an LTE-TDD system networking framework, where the method includes:

 301. Obtain uplink channel information of each user equipment in the serving cell of the user equipment to be scheduled.

 The serving cell belongs to a measurement cell set, and the measurement cell set further includes at least one coordinated cell.

 The specific implementation of the step is that the base station controls all the cells in the measurement cell set to measure the SRS transmitted by each user equipment in the serving cell, and obtains uplink channel information of each user equipment.

The measurement cell set is a set of a plurality of cells including the serving cell, and is identified by using μ Μ in the embodiment of the present invention. The establishment manner may be a method of using a fixed allocation, that is, several cells in the vicinity of the serving cell form a measurement cell set, or may be a RSRP (Reference Signal Receiving Power) of each cell fed back according to the to-be-scheduled user equipment. Receive power), according to |RS -RSR^. | < 73⁄4r selects M measurement set cells, where is the RSRP of the serving cell, RS. It is the RSRP of other cells, and 73⁄4r is the preset threshold. The embodiment of the present invention provides only two possible implementation manners, and may also use other establishment manners to establish a measurement cell set, which is not limited by the embodiment of the present invention. Moreover, for a cell in the same measurement cell set, the base station allocates a sequence number or a label accordingly to identify. The coordinated cell is a cell that measures channel information in the measurement cell group and can exchange measurement information with the serving cell.

It should be noted that, for a cell belonging to the same measurement cell set, after the base station sequentially performs scheduling on all cells in the measurement cell set, it can be determined that the base station is all cells in the measurement cell set. Complete a round of user equipment scheduling, the following simple It is called scheduling processing for measuring a set of cells. Therefore, for the same round of scheduling processing of the measurement cell set, there will be a scheduled cell and an unscheduled cell within the same measurement cell set. In a measurement cell set, for a user equipment that measures cell services in a cell set, each user equipment corresponds to a set of transmit cells, and is identified by using ^, and the cells in the transmit cell set are jointly associated with the same user equipment. The downlink data is transmitted, and the cells within the transmitting cell set are necessarily in the measured cell set.

 302. Determine, according to the uplink channel information and scheduling information of the at least one coordinated cell, a modulation and coding scheme (MCS) required for scheduling.

 Referring to the related description of step 301, it can be known that all cells in the measurement cell set have a scheduling order, and if the at least one coordinated cell includes a scheduled cell in a scheduling order before the serving cell, the scheduled cell The scheduling information includes the transmission weights of the user equipment and the transmission power of the latest scheduling of the sub-bands of the scheduled cell; if the coordinated cell includes an unscheduled cell with a scheduling order after the serving cell, the unscheduled The scheduling information of the cell includes the transmission power of the user equipment last scheduled on each sub-band of the unscheduled cell.

 303. Allocate transmission resources to the user equipment to be scheduled according to the MCS.

 In the method for scheduling a user equipment, the base station calculates the MCS by acquiring the uplink channel information of the serving cell where the user equipment to be scheduled is located, and combining the scheduling information of other cells in the current measurement cell set. Then, the downlink transmission resource is allocated to the to-be-scheduled user equipment based on the MCS. Compared with the prior art, the transmission mode of the downlink data actually used by the base station side is different from the transmission mode assumed by the user equipment, and the base station side may incorrectly estimate the downlink channel according to the inaccurate CQI. Through such a process step, the base station side can consider both the interference generated by the other cells in the measurement cell set to the downlink channel of the serving cell, and the channel estimation performed by the base station side according to the uplink channel information on the downlink channel, which can be improved. The accuracy of the base station scheduling the user equipment.

 Further, as shown in FIG. 4, an embodiment of the present invention provides a specific implementation of the foregoing step 302, including:

3021. Determine, according to the uplink channel information and scheduling information of the at least one coordinated cell, downlink channel information of each user equipment, and downlink channel information of each user equipment. The information includes the signal to interference and noise ratio of the user equipment on each subband.

 The related description of the scheduling information of the at least one coordinated cell is the same as the related description in step 302.

 3022. Determine, according to the downlink channel information of each user equipment, a user equipment pre-scheduled on the each sub-band.

 3023. Perform a combining process on the signal to interference and noise ratio of the first subband, where the pre-scheduled user equipment on the first subband is the to-be-scheduled user equipment. That is, the serving cell pre-schedules the signal to interference and noise ratios on the subbands used by the user equipment to be scheduled.

 3024. Determine the MCS according to the combined signal to interference and noise ratio.

 In this embodiment, the downlink channel information of each user equipment is determined by using the uplink channel information and the scheduling information of the at least one coordinated cell, and then the serving cell is pre-scheduled for the to-be-scheduled user. The signal to interference and noise ratio on the subband used by the device is combined to determine the MCS according to the combined signal to interference and noise ratio, so that the base station side can consider both the downlink of the serving cell and the other cell in the measurement cell set. The interference generated by the channel can be combined with the channel estimation performed by the base station side on the downlink channel according to the uplink channel information, which can improve the accuracy of the scheduling of the user equipment by the base station, and avoid the downlink channel estimation information reported by the user equipment side to determine the MCS. Possible errors.

 Further, after the foregoing step 3022 is completed, as shown in FIG. 5, the foregoing method for scheduling user equipment further includes:

 3025. Determine, by the serving cell, a transmit weight and a transmit power of the pre-scheduled user equipment on each sub-band.

 3026. Send the determined transmit weight and/or transmit power to some or all of the at least one coordinated cell within the measurement cell set.

In this way, the scheduling information of the serving cell (including the transmission weight and the transmission power) may be provided to the coordinated cell with the scheduling sequence behind to ensure the correct scheduling of the coordinated cell; in addition, the transmit power may be provided to the next round of scheduling. The scheduling order in the coordinated cell in front of the serving cell ensures the correct scheduling of the coordinated cell. Of course, other methods may also be used, for example, the scheduling information is temporarily stored in the base station, and when the coordinated cell performs scheduling, the serving cell requests to obtain the required scheduling information. Specifically, the embodiment of the present invention provides the following three implementation manners for the specific implementation of the foregoing step 3026, including:

 A first implementation: if there is one or more unscheduled cells whose scheduling order is after the serving cell, the serving cell sends the determined transmission weight and transmission power to all unscheduled cells.

 a second implementation manner: if there is one or more unscheduled cells whose scheduling order is after the serving cell, the serving cell sends the determined transmission weight and the transmit power to the unscheduled following the scheduling sequence Community.

 A third implementation manner: if there is no unscheduled cell whose scheduling order is after the serving cell, the serving cell sends the determined transmit power to all coordinated cells.

 In a second implementation manner, after the serving cell sends only the determined transmission weight and the transmit power to the unscheduled cell following the scheduling sequence, the unscheduled cell needs to be after the scheduling is completed. Transmitting the transmission weight and transmission power determined by itself, and the transmission weight and transmission power of the serving cell to the subsequent unscheduled cell; or transmitting weights and transmissions of the serving cell required by other unscheduled cells The power may actively make a request to the serving cell during the process of performing user equipment scheduling.

 In a third implementation manner, referring to the related description of the foregoing step 302, the technical solution provided by the embodiment of the present invention may schedule the transmission weight of the user equipment and the transmission power and/or according to the latest sub-band of the scheduled cell. On each sub-band of the unscheduled cell, the transmission power of the user equipment is scheduled recently, so in the process of the third implementation, the serving cell may also only transmit the determined transmit power to all coordinated cells.

 Further, the embodiment of the present invention provides a specific implementation manner of the step 3021. As shown in FIG. 6, the method includes:

 401. Establish a corresponding interference noise power matrix for each user equipment.

The interference noise power matrix is used to represent interference noise power corresponding to all downlink data streams sent by the cell in the measurement cell set to the user equipment. Its expression can be

Figure imgf000018_0001
Wherein, the interference noise power generated by the measurement cell set on the downlink data stream of the subband sb.

 And obtaining, according to the interference noise power matrix, the uplink channel information, and the scheduling information of the at least one coordinated cell, a cell in a transmit cell set corresponding to each user equipment, respectively, on each subband of the serving cell. The signal to interference and noise ratio corresponding to the downlink data stream transmitted to the user equipment, respectively, and generating downlink channel information.

 When the calculation of the signal to interference and noise ratio corresponding to the downlink data stream transmitted by each of the sub-bands of the serving cell to each user equipment is performed, the technical solution provided by the embodiment of the present invention is set to Each user device is calculated separately.

 For a user equipment, the embodiment of the present invention can provide an algorithm based on an MRC (Max Ratio Combine) equalization algorithm and an IRC (Interference Repress Combine) equalization algorithm.

 For the MRC equalization algorithm, the signal to interference and noise ratio corresponding to the downlink data stream transmitted by the cells in the transmitting cell set to each specific user equipment in each subband of the serving cell may be referred to the following formula:

μ 3

 among them,

 Others

Figure imgf000018_0002

Where L is the transmit power of the sub-band when the unscheduled cell is scheduled by the base station, and is the number of transmit antennas of the unscheduled cell m . 3⁄4 is the transmission weight matrix of the cell on the sub-band occupied by the specific user equipment. The column of 3⁄4 is ^ , indicating the transmission weight vector of the downlink data stream Stx that the cell 1 carries to the transmission. For the IRC equalization algorithm, calculating the signal to interference and noise ratio corresponding to the downlink data stream that the serving cell transmits to each specific user equipment in each subband of the serving cell, refer to the following formula:

SINR n s sb

Figure imgf000019_0001

« ={K ff ) (KAK ff ) + ) K ff

Figure imgf000019_0002
VJ H I j

 I卞

H SB _ J \ P?HX S μ

m' eff _ PH jT others

 Wherein, "is the first diagonal element. It is further worthwhile to note that the embodiment of the present invention provides several specific implementations of the step 401, as shown in Figures 7, 8, and 9.

 The method shown in Figure 7 includes:

 A401 1. Receive CQI information sent by each user equipment.

 The CQI information is a transmission mode that may be used by the base station side after the user equipment measures the downlink channel of each cell in the measurement cell set, and determines the possible use of the base station side according to the assumed transmission mode. Virtual downlink data stream and calculate corresponding CQI information. The specific calculation method is a well-known technology in the art, and details are not described herein again.

 A4012: Perform calculation according to the CQI information, and obtain interference noise power generated by the measurement cell set out-of-cell on the virtual downlink data stream fed back by each user equipment.

It is to be noted that, in different versions of the LTE standard, the assumptions on which the CQI information sent by the user equipment is based are different. Therefore, the embodiment of the present invention separately provides a corresponding method for calculating interference noise information by the CQI. And, in the subsequent embodiment, the CQI corresponding to the stream sent by the user equipment is recorded as CQI s side . When CQI S is obtained by calculating the signal-to-noise ratio of the downlink pilot signal of one cell and the total interference noise power of other cells, under this condition, when the user equipment feeds back in the manner of transmit diversity, S ft = i The interference noise power generated by the cell outside the measurement cell set on the virtual downlink data stream fed back by the user equipment may be referred to the following formula:

Figure imgf000020_0001
Where ^ is the VAM (Virtual Antenna Mapping) matrix of the CRS of the cell c.

SINR^ e is the signal-to-noise ratio of the virtual downlink data stream based on the CQI' mapping. T c is the number of transmit antennas of base station c. To is the transmission weight matrix of the cell on the occupied UE subband. It is the last transmit power of the cell on the sub-band of the user equipment to be scheduled.

When the user equipment to be scheduled is fed back in a closed loop mode, ^^≥1, the interference noise power generated by the outer cell of the measurement cell set on the virtual downlink data stream fed back by the user equipment may refer to the following formula:

Figure imgf000020_0002
Mja t [^ t H†V c CRS PMI s '

 p

^^ t H†V c CRS PM c ' where PM s sb is the PMI (Precoding Matrix Index ) precoding vector of the virtual downlink data stream fed back by the user equipment to the cell c.

When CQr ide is obtained by calculating the signal-to-noise ratio of the downlink pilot signal of a cell and the interference noise power outside the measurement set, under this condition, when the user equipment feeds back in the manner of transmit diversity, at this time, the user is The interference noise power generated by the outer cell of the measurement cell set on the virtual downlink data stream fed back by the device may be referred to the following formula:

Figure imgf000020_0003
When the user equipment feeds back in the TM8 closed loop mode, ^ ^ ≥ 1 , the interference noise power generated by the measurement cell set out of the virtual downlink data stream fed back by the user equipment Can refer to the formula: [^ t H†' V c CRS PMI '

 p

SINR1*: where PM s sb is a PMI (Precoding Matrix Index) precoding vector on which the user equipment feeds back to the cell c.

 When the user equipment feeds back in the TM9 closed-loop mode, ^ ^ ≥ 1 , the interference noise power generated by the cell outside the measurement cell set on the virtual downlink data stream fed back by the user equipment can refer to the following formula:

P.

Figure imgf000021_0001
Where ^^/- ^ is the VAM matrix of the CSI-RS of the target cell c, generally -=/.

 A4013: Perform, on the virtual downlink data stream fed back by each user equipment, interference processing power generated by the measurement cell out-of-band cell, and obtain an average value of the interference noise power as all downlink data in the serving cell. Interference noise power on the stream.

Embodiments of the present invention provide a method herein, with reference to the following formula:

Figure imgf000021_0002

 Wherein, ^ is a virtual downlink data stream fed back by the user equipment to be scheduled.

 A4014: Establish, according to interference noise power on all downlink data flows in the serving cell, a corresponding interference noise power matrix for each user equipment.

 The method shown in Figure 8 includes:

 B4011: Receive CQI information sent by each user equipment.

 B4012: Perform calculation according to the CQI information, and obtain interference noise power generated by the measurement cell set out-of-cell on the virtual downlink data stream fed back by each user equipment.

 The implementation method of step B4012 can refer to the detailed description of A4012.

B4013: When the virtual downlink data flow fed back by the user equipment is the same as the number of downlink data flows in the serving cell, the virtual downlink data stream fed back by the user equipment is used by the measurement. The interference noise power generated by the cell outside the cell is determined as the interference noise power generated by the cell outside the measurement cell set on each downlink data stream in the serving cell.

 The corresponding expression for this step is 3⁄4^ =^≤.

 B4014: Establish a corresponding interference noise power matrix for each user equipment according to interference noise power generated by the measurement cell outside the cell on all downlink data flows in the serving cell.

It should be noted that the method flow shown in FIG. 7 and FIG. 8 is only two preferred embodiments for constructing an interference noise power matrix provided by the embodiments of the present invention. Whether or not to use the method flow shown in FIG. 7 and FIG. 8 can be judged according to actual needs. For example, it can be rounded according to the product implementation complexity; it can also be judged according to the size of the measured cell set. If (Μ >Μ Γ3⁄4 _ ) & (Μ -Γ > / Γ3⁄4 _ ), it is not necessary to calculate, otherwise the calculation is normal. Optional M rar = 3 , = 2. Where M is the number of cells in the measurement cell set, and T is the number of cells jointly transmitting downlink data to a specific user equipment in the measurement cell set.

 If it is not necessary to refer to the CQI fed back by the user equipment for calculation, the corresponding interference noise power matrix can be directly set to a matrix of 0 for each user equipment.

 The method shown in Figure 9 includes:

 C4011: Acquire interference noise power generated by a cell in the measurement cell set on all downlink data flows in the serving cell.

 C4012: Calculate, according to the interference ratio coefficient, the acquired interference noise power generated by the cells in the measurement cell set on all downlink data flows in the serving cell, to obtain, on the downlink data flow in the serving cell. The measuring the interference noise power generated by the cell outside the set of cells.

The specific implementation of C4012 can be implemented by P. ^, where is the interference power matrix within the measurement, which is 4

Figure imgf000022_0001

The example coefficient represents the ratio of the out-of-set interference to the interference within the measurement set, which can usually be a constant.

C4013: Establish corresponding interference noise for each user equipment according to interference noise power generated by the outer cell of the measurement cell set on all downlink data flows in the serving cell. Power matrix.

 The method flow shown in FIG. 7 , FIG. 8 and FIG. 9 provided by the embodiment of the present invention enables the base station side to consider the quality estimation of the downlink channel of the user equipment when the downlink transmission resource is allocated to the user equipment to be scheduled. , further providing accuracy. Another embodiment of the present invention provides a base station, which can implement the method flow of all base stations on the side shown in FIG. 2 to FIG.

 As shown in FIG. 10, the base station includes:

 The acquiring unit 51 is configured to obtain uplink channel information of each user equipment in the serving cell of the user equipment to be scheduled, where the serving cell belongs to a measurement cell set, and the measurement cell set further includes at least one coordinated cell.

 The first determining unit 52 is configured to determine, according to the uplink channel information acquired by the acquiring unit 51 and scheduling information of the at least one coordinated cell, a modulation and coding scheme MCS required for scheduling.

 The allocating unit 53 is configured to allocate a transmission resource to the to-be-scheduled user equipment according to the MCS determined by the first determining unit 52.

 Wherein, all cells in the measurement cell set have a scheduling order, and

 If the at least one coordinated cell includes a scheduled cell in a scheduling order before the serving cell, the scheduling information of the scheduled cell includes the transmission weight of the last scheduled user equipment on each subband of the scheduled cell. And transmit power; and/or

 If the at least one coordinated cell includes an unscheduled cell whose scheduling order is after the serving cell, the scheduling information of the unscheduled cell includes the transmit power of the user equipment last time on each subband of the unscheduled cell.

 Optionally, the acquiring unit 51 is configured to control, by all the cells in the measurement cell set, the sounding reference signal SRS transmitted by each user equipment in the serving cell, to obtain an uplink channel of each user equipment. information.

 Optionally, as shown in FIG. 11, the first determining unit 52 includes:

a first determining module 521, configured to determine, according to the uplink channel information acquired by the acquiring unit 51 and scheduling information of the at least one coordinated cell, the downlink of each user equipment Channel information, the downlink channel information of each user equipment includes a signal to interference and noise ratio of the user equipment on each subband;

 The second determining module 522 is configured to determine user equipment pre-scheduled on the respective sub-bands according to the downlink channel information of each user equipment determined by the first determining module 521.

 The merging module 523 is configured to perform a merging process on the signal to interference and noise ratio on the first subband in the signal to interference and noise ratio in each subband determined by the first determining module 521, where the second determining module 522 determines the pre The sub-band of the user equipment to be scheduled is the first sub-band, and the third determining module 524 is configured to determine the MCS according to the signal-to-noise ratio obtained by combining the processing by the combining module 523. .

 Optionally, as shown in FIG. 12, the base station further includes:

 The second determining unit 54 is configured to determine, by the serving cell, the transmit weight and the transmit power of the pre-scheduled user equipment on each sub-band.

 The sending unit 55 is configured to send the transmission weight and/or the transmit power determined by the second determining unit 54 to part or all of the at least one coordinated cell in the measurement cell set.

 Optionally, the sending unit 55 is configured to send the determined transmit weight and transmit power to all unscheduled cells when there is one or more unscheduled cells after the scheduling sequence is in the serving cell.

 Alternatively, the sending unit 55 is configured to send the determined transmission weight and the transmit power to the unscheduled following the scheduling sequence when there is one or more unscheduled cells whose scheduling order is after the serving cell Community.

 Alternatively, the sending unit 55 is configured to send the determined transmit power to all coordinated cells when there is no unscheduled cell whose scheduling order is after the serving cell.

 Optionally, as shown in FIG. 13, the first determining module 521 includes:

 The matrix establishment sub-module 5211 is configured to separately establish a corresponding interference noise power matrix for each user equipment, where the interference noise power matrix is used to represent interference corresponding to all downlink data streams sent by the cell in the measurement cell set to the user equipment. Noise power.

The calculation sub-module 5212 is configured to perform calculation according to the interference noise power matrix, the uplink channel information, and the scheduling information of the at least one coordinated cell established by the matrix establishment sub-module 5211, and respectively obtain corresponding to each user equipment. The cell within the transmitting cell set is in the service The signal to interference and noise ratio corresponding to the downlink data stream respectively transmitted to the user equipment on each subband of the cell, and generating downlink channel information.

 Optionally, the matrix establishment sub-module 5211 is configured to receive the CQI information sent by each user equipment, perform calculation according to the CQI information, and obtain the virtual downlink data stream fed back by each user equipment. Measure the interference noise power generated by the cell outside the cell set; perform the mean processing on the interference noise power generated by the cell outside the measurement cell set on the virtual downlink data stream fed back by each user equipment, and obtain the mean value of the interference noise power As the interference noise power on all the downlink data streams in the serving cell, the corresponding interference noise power matrix is separately established for each user equipment according to the interference noise power on all the downlink data streams in the serving cell.

 Optionally, the matrix establishment sub-module 5211 is configured to receive the CQI information sent by each user equipment, perform calculation according to the CQI information, and obtain the virtual downlink data stream fed back by each user equipment. Measuring the interference noise power generated by the cell outside the cell set; when the virtual downlink data stream fed back by the user equipment is the same as the number of the downlink data stream in the serving cell, the virtual downlink data stream fed back by the user equipment is used by the The interference noise power generated by the measurement cell outside the cell is determined as the interference noise power generated by the measurement cell outside the cell on each downlink data stream in the serving cell; according to the downlink data flow in the serving cell The measuring the interference noise power generated by the cell outside the set of cells, and establishing a corresponding interference noise power matrix for each user equipment.

 Optionally, the matrix establishment sub-module 5211 is configured to acquire interference noise power generated by cells in the measurement cell set on all downlink data flows in the serving cell; according to the interference ratio coefficient and the obtained The interference noise power generated by the cells in the measurement cell set on all the downlink data flows in the serving cell is calculated, and the interference noise power generated by the outer cell of the measurement cell set on all downlink data streams in the serving cell is obtained. And correspondingly establishing an interference noise power matrix for each user equipment according to the interference noise power generated by the measurement cell outside the cell on all the downlink data flows in the serving cell.

The base station provided by the embodiment of the present invention calculates the MCS by acquiring the uplink channel information of the serving cell where the user equipment to be scheduled is located, and combining the scheduling information of other cells in the current measurement cell set, and then based on the MCS. Describe the scheduling user equipment to allocate downlink transmission Resources. Compared with the prior art, the transmission mode of the downlink data actually used by the base station side is different from the transmission mode assumed by the user equipment, and the base station side may incorrectly estimate the downlink channel according to the inaccurate CQI. Through such a process step, the base station side can consider both the influence of other cells on the serving cell and the base station side self-estimation, and can improve the accuracy of the base station to the user equipment scheduling.

 The embodiment of the present invention further provides a base station, as shown in FIG. 14, including at least one central processing unit 61 and a memory 62, the memory 62 is configured with a code, and the central processing unit 61 can read the storage in the memory 62. The code is used to implement the method flow shown in Figures 2-9. The central processor 61 and the memory 62 communicate via a bus.

 The central processing unit 61 is configured to acquire uplink channel information of each user equipment in the serving cell of the user equipment to be scheduled, where the serving cell belongs to a measurement cell set, and the measurement cell set further includes at least one collaboration. And determining, according to the uplink channel information and the scheduling information of the at least one coordinated cell, a modulation and coding scheme MCS required for scheduling; and allocating transmission resources to the to-be-scheduled user equipment according to the MCS.

 The memory 62 is further configured to store uplink channel information, scheduling information of at least one coordinated cell, a modulation and coding scheme MCS, and a transmission resource allocated to the user equipment to be scheduled.

 Wherein, all cells in the measurement cell set have a scheduling order, and

 If the at least one coordinated cell includes a scheduled cell in a scheduling order before the serving cell, the scheduling information of the scheduled cell includes the transmission weight of the last scheduled user equipment on each subband of the scheduled cell. And transmit power; and/or

 If the at least one coordinated cell includes an unscheduled cell whose scheduling order is after the serving cell, the scheduling information of the unscheduled cell includes the transmit power of the user equipment last time on each subband of the unscheduled cell.

 Optionally, the uplink channel information is obtained by measuring, by all the cells in the measurement cell set, the sounding reference signal SRS transmitted by each user equipment in the serving cell.

Optionally, the central processing unit 61 is configured to determine downlink channel information of each user equipment according to the uplink channel information and scheduling information of the at least one coordinated cell, where each user equipment is The downlink channel information includes a signal to interference and noise ratio of the user equipment on each subband; and determining, according to the downlink channel information of each user equipment, on each of the subbands a pre-scheduled user equipment; combining the signal to interference and noise ratios on the first subband, wherein the pre-scheduled user equipment on the first subband is the to-be-scheduled user equipment; Ratio, the MCS is determined. Optionally, as shown in FIG. 15, the base station further includes a transmitter 63.

 The central processing unit 61 is specifically configured to determine that the serving cell schedules the transmit weight and the transmit power of the pre-scheduled user equipment on each sub-band.

 The transmitter 63 is configured to send the determined transmission weight and/or transmit power to part or all of the at least one coordinated cell within the measurement cell set.

 Optionally, the transmitter 63 is specifically configured to send the determined transmit weight and transmit power to all unscheduled cells when there is one or more unscheduled cells whose scheduling order is after the serving cell;

 And for transmitting, when the scheduling order is one or more unscheduled cells after the serving cell, the determined transmission weight and the transmit power to the unscheduled cell immediately following the scheduling sequence;

 And for transmitting the determined transmit power to all coordinated cells when there is no unscheduled cell whose scheduling order is after the serving cell.

 The memory 61 is also used for the determined transmit weight and transmit power.

 Optionally, the central processing unit 61 is further configured to separately establish a corresponding interference noise power matrix for each user equipment, where the interference noise power matrix is used to represent all that is sent by the cell in the measurement cell set to the user equipment. The interference noise power corresponding to the downlink data stream is calculated according to the interference noise power matrix, the uplink channel information, and the scheduling information of the at least one coordinated cell, respectively, and the cells in the transmit cell set corresponding to each user equipment are respectively obtained. The signal to interference and noise ratio corresponding to the downlink data stream transmitted by the user equipment on each subband of the serving cell, and generating downlink channel information.

 The memory 61 is further configured to store an interference noise power matrix.

Optionally, the central processing unit 61 is configured to receive the CQI information sent by each user equipment, perform calculation according to the CQI information, and obtain the virtual downlink data stream fed back by each user equipment. Measuring interference noise power generated by a cell outside the cell set; Performing, on the virtual downlink data stream fed back by each user equipment, the interference noise power generated by the cell outside the measurement cell, performing mean processing, and obtaining the average value of the interference noise power as all the downlink data streams in the serving cell. Interference noise power; respectively, according to the interference noise power on all downlink data streams in the serving cell, respectively establish a corresponding interference noise power matrix for each user equipment.

 Optionally, the central processing unit 61 is specifically configured to receive CQI information sent by each user equipment.

 Calculating, according to the CQI information, the interference noise power generated by the measurement cell out-of-band cell on the virtual downlink data stream fed back by each user equipment; the virtual downlink data flow fed back by the user equipment and the serving cell When the number of the downlink data streams is the same, the interference noise power generated by the measurement cell out-of-band cell on each virtual downlink data stream fed back by the user equipment is determined as being determined by each of the downlink data streams in the serving cell. Measure the interference noise power generated by the cell outside the cell set; and establish a corresponding interference noise power matrix for each user equipment according to the interference noise power generated by the cell outside the measurement cell set on all downlink data flows in the serving cell .

 Optionally, the central processing unit 61 is specifically configured to acquire interference noise power generated by cells in the measurement cell set on all downlink data flows in the serving cell; according to the interference ratio coefficient and the obtained The interference noise power generated by the cells in the measurement cell set on all the downlink data flows in the serving cell is calculated, and the interference noise power generated by the outer cell of the measurement cell set on all downlink data streams in the serving cell is obtained. And correspondingly establishing an interference noise power matrix for each user equipment according to the interference noise power generated by the measurement cell outside the cell on all the downlink data flows in the serving cell.

The base station according to the embodiment of the present invention can measure the uplink channel of the user equipment to be scheduled by itself, obtain the uplink channel information, and combine the first scheduling information of the scheduled cell and the unscheduled cell in the current measurement cell set. The second scheduling information is used to calculate a signal to interference and noise ratio of the downlink data stream corresponding to the to-be-scheduled user equipment, and then, based on the signal to interference and noise ratio of the downlink data stream corresponding to the to-be-scheduled user equipment, Allocate downlink transmission resources. Compared with the prior art, the transmission mode of the downlink data actually used by the base station side is different from the transmission mode assumed by the user equipment, and the base station side may perform the downlink channel according to the inaccurate CQI. The problem of the error estimation is performed by the present invention, so that the base station side can consider both the interference of the other cells in the measurement cell set to the downlink channel of the serving cell, and the base station side according to the uplink channel information. The channel estimation performed on the downlink channel can improve the accuracy of the base station scheduling the user equipment.

 And, in order to further improve the accuracy, the base station can also be combined with feedback from the user equipment.

The CQI information is further processed.

 Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus necessary general hardware, and of course, by hardware, but in many cases, the former is a better implementation. . Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a readable storage medium, such as a floppy disk of a computer. A hard disk or optical disk or the like includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.

 The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Claims

Claims
 A method for scheduling user equipment, comprising:
 Obtaining uplink channel information of each user equipment in the serving cell of the user equipment to be scheduled, where the serving cell belongs to a measurement cell set, and the measurement cell set further includes at least one coordinated cell;
 Determining a modulation and coding scheme MCS required for scheduling according to the uplink channel information and scheduling information of the at least one coordinated cell;
 And allocating transmission resources to the to-be-scheduled user equipment according to the MCS.
 2. The method according to claim 1, wherein: all cells in the measurement cell set have a scheduling order, and
 If the at least one coordinated cell includes a scheduled cell in a scheduling order before the serving cell, the scheduling information of the scheduled cell includes the transmission weight of the last scheduled user equipment on each subband of the scheduled cell. And transmit power; and/or
 If the at least one coordinated cell includes an unscheduled cell whose scheduling order is after the serving cell, the scheduling information of the unscheduled cell includes the transmit power of the user equipment at the latest time on each subband of the unscheduled cell.
 The method according to claim 1 or 2, wherein the uplink channel information is that all cells in the measurement cell set perform a sounding reference signal SRS transmitted by each user equipment in the serving cell. Measured.
 The method according to any one of claims 1 to 3, wherein the determining the MCS required for the scheduling comprises:
 Determining downlink channel information of each user equipment according to the uplink channel information and scheduling information of the at least one coordinated cell, where downlink channel information of each user equipment includes a message of the user equipment on each subband Dry noise ratio
 Determining user equipment pre-adjusted on the respective sub-bands according to the downlink channel information of each user equipment;
 Combining the signal to interference and noise ratio on the first subband, wherein the pre-scheduled user equipment on the first subband is the to-be-scheduled user equipment;
The MCS is determined based on the combined signal to interference and noise ratio. The method according to claim 4, wherein after the determining the user equipment pre-scheduled on the each sub-band, the method further includes:
 Determining, by the serving cell, scheduling transmission weights and transmission powers of the pre-scheduled user equipment on each sub-band;
 The determined transmit weight and/or transmit power is transmitted to some or all of the at least one coordinated cell within the set of measurement cells.
 The method according to claim 5, wherein the transmitting the determined transmission weight and/or transmission power to part or all of the at least one coordinated cell in the measurement cell set comprises:
 If there is one or more unscheduled cells whose scheduling order is after the serving cell, the serving cell transmits the determined transmission weight and transmission power to all unscheduled cells; or
 If there is one or more unscheduled cells whose scheduling order is after the serving cell, the serving cell sends the determined transmission weight and transmission power to the unscheduled cell immediately following the scheduling sequence; or
 If there is no unscheduled cell whose scheduling order is after the serving cell, the serving cell transmits the determined transmit power to all cooperating cells.
 The method according to any one of claims 4 to 6, wherein the determining the downlink channel information of each user equipment comprises:
 Establishing, respectively, a corresponding interference noise power matrix for each user equipment, where the interference noise power matrix is used to represent interference noise power corresponding to all downlink data streams sent by the cell in the measurement cell set to the user equipment;
 Calculating, according to the interference noise power matrix, the uplink channel information, and the scheduling information of the at least one coordinated cell, respectively, obtaining cells in a transmit cell set corresponding to each user equipment on each subband of the serving cell The signal to interference and noise ratio corresponding to the downlink data stream transmitted to the user equipment, respectively, and generating downlink channel information.
 The method according to claim 7, wherein the establishing, by each user equipment, a corresponding interference noise power matrix comprises:
Receiving CQI information sent by each user equipment; Performing calculation according to the CQI information, and obtaining interference noise power generated by the measurement cell set outer cell on the virtual downlink data stream fed back by each user equipment;
 For the virtual downlink data stream fed back by each user equipment, the interference noise power generated by the measurement cell set outer cell is averaged, and the average value of the interference noise power is obtained as all downlink data streams in the serving cell. Interference noise power;
 A corresponding interference noise power matrix is established for each user equipment according to the interference noise power on all downlink data streams in the serving cell.
 The method according to claim 7, wherein the establishing, by each user equipment, a corresponding interference noise power matrix comprises:
 Receiving CQI information sent by each user equipment;
 Performing calculation according to the CQI information, and obtaining interference noise power generated by the measurement cell set outer cell on the virtual downlink data stream fed back by each user equipment;
 Determining the interference noise power generated by the outer cell of the measurement cell set on each virtual downlink data stream fed back by the user equipment, when the number of the downlink data flows that are fed back by the user equipment is the same as the number of the downlink data flows in the serving cell Interference noise power generated by the outer cell of the measurement cell set on each downlink data stream in the serving cell;
 And correspondingly generating an interference noise power matrix for each user equipment according to the interference noise power generated by the measurement cell outside the cell on all downlink data flows in the serving cell.
 The method according to claim 7, wherein the establishing a corresponding interference noise power matrix for each user equipment comprises:
 Obtaining interference noise power generated by cells in the measurement cell set on all downlink data flows in the serving cell;
 Calculating, according to the interference ratio coefficient, the acquired interference noise power generated by the cells in the measurement cell set on all downlink data flows in the serving cell, to obtain, by using the foregoing, all downlink data flows in the serving cell Measuring interference noise power generated by a cell outside the cell set;
 And correspondingly generating an interference noise power matrix for each user equipment according to the interference noise power generated by the measurement cell outside the cell on all downlink data flows in the serving cell.
A base station, comprising: An acquiring unit, configured to acquire uplink channel information of each user equipment in a serving cell of the user equipment to be scheduled, where the serving cell belongs to a measurement cell set, and the measurement cell set further includes at least one coordinated cell;
 a first determining unit, configured to determine, according to the uplink channel information acquired by the acquiring unit and scheduling information of the at least one coordinated cell, a modulation and coding scheme MCS required for scheduling, and an allocating unit, configured to use, according to the first Determining, by the unit, the MCS, to allocate a transmission resource to the to-be-scheduled user equipment.
 The base station according to claim 11, wherein all the cells in the measurement cell set have a scheduling order, and
 If the at least one coordinated cell includes a scheduled cell in a scheduling order before the serving cell, the scheduling information of the scheduled cell includes the transmission weight of the last scheduled user equipment on each subband of the scheduled cell. And transmit power; and/or
 If the at least one coordinated cell includes an unscheduled cell whose scheduling order is after the serving cell, the scheduling information of the unscheduled cell includes the transmit power of the user equipment at the latest time on each subband of the unscheduled cell.
 The base station according to claim 11 or 12, wherein the uplink channel information is that all cells in the measurement cell set perform a sounding reference signal SRS transmitted by each user equipment in the serving cell. Measured.
 The base station according to any one of claims 11 to 13, wherein the first determining unit comprises:
 a first determining module, configured to determine downlink channel information of each user equipment according to the uplink channel information acquired by the acquiring unit and scheduling information of the at least one coordinated cell, where the downlink of each user equipment is The channel information includes a signal to interference and noise ratio of the user equipment on each subband;
 a second determining module, configured to determine, according to the downlink channel information of each user equipment determined by the first determining module, a user equipment pre-scheduled on the each sub-band;
a merging module, configured to perform a combining process on a signal to interference and noise ratio on a first subband in a signal to interference and noise ratio determined on each subband determined by the first determining module, where the second determining module determines the pre-scheduled The sub-band of the user equipment that is the user equipment to be scheduled is the first sub-band; And a third determining module, configured to determine the MCS according to a signal to interference and noise ratio obtained by performing a combining process by the combining module.
 The base station according to claim 14, wherein the base station further comprises: a second determining unit, configured to determine, by the serving cell, a transmission weight of the pre-scheduled user equipment on each sub-band And the transmission power;
 And a sending unit, configured to send the transmission weight and/or the transmit power determined by the second determining unit to part or all of the at least one coordinated cell in the measurement cell set.
 The base station according to claim 15, wherein the sending unit is configured to: when there is one or more unscheduled cells in a scheduling order after the serving cell,
Or the plurality of unscheduled cells, the determined transmission weights and the transmit powers are sent to the unscheduled cells immediately following the scheduling sequence; when the cells are scheduled, the determined transmit powers are sent to all coordinated cells.
 The base station according to any one of claims 14 to 16, wherein the first determining module comprises:
 a matrix establishment sub-module, configured to respectively establish a corresponding interference noise power matrix for each user equipment, where the interference noise power matrix is used to represent interference noise corresponding to all downlink data streams sent by the cell in the measurement cell set to the user equipment Power
 a calculation submodule, configured to calculate, according to the interference noise power matrix established by the matrix establishment submodule, the uplink channel information, and the scheduling information of the at least one coordinated cell, respectively, to obtain a transmitting cell corresponding to each user equipment The cell within the set respectively transmits a signal to interference and noise ratio corresponding to the downlink data stream transmitted by the user equipment on each subband of the serving cell, and generates downlink channel information.
The base station according to claim 17, wherein the matrix establishment submodule is configured to receive CQI information sent by each user equipment, perform calculation according to the CQI information, and obtain feedback at each user equipment. The interference noise power generated by the cell outside the measurement cell set on the virtual downlink data stream; on the virtual downlink data stream fed back by each user equipment, Measure the interference noise power generated by the cell outside the set of cells to perform mean processing, and obtain the average value of the interference noise power as the interference noise power on all downlink data streams in the serving cell; according to all downlink data flows in the serving cell The interference noise power is used to establish a corresponding interference noise power matrix for each user equipment.
 The base station according to claim 17, wherein the matrix establishment submodule is configured to receive CQI information sent by each user equipment, perform calculation according to the CQI information, and obtain feedback at each user equipment. The interference noise power generated by the cell outside the measurement cell set on the virtual downlink data stream; when the virtual downlink data stream fed back by the user equipment is the same as the number of downlink data flows in the serving cell, each user equipment feedback The interference noise power generated by the outer cell of the measurement cell set on the virtual downlink data stream is determined as the interference noise power generated by the outer cell of the measurement cell set on each downlink data stream in the serving cell; The interference noise power generated by the cells outside the measurement cell set on all the downlink data streams in the cell is respectively established, and a corresponding interference noise power matrix is established for each user equipment.
 The base station according to claim 17, wherein the matrix establishment sub-module is configured to acquire interference noise power generated by cells in the measurement cell set on all downlink data streams in the serving cell; Calculating, by using the interference ratio coefficient, the acquired interference noise power generated by the cells in the measurement cell set on all downlink data flows in the serving cell, and obtaining the measurement on all downlink data flows in the serving cell The interference noise power generated by the cell outside the cell is set; and the corresponding interference noise power matrix is established for each user equipment according to the interference noise power generated by the cell outside the measurement cell set in all the downlink data streams in the serving cell.
PCT/CN2013/072601 2013-03-14 2013-03-14 Method for scheduling user equipment and base station WO2014139121A1 (en)

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