JP2010232847A - Radio base station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio base station capable of easily determining transmission power allocation to respective sub channels and respective transmission antennas while considering the restriction of the maximum output value for each transmission antenna. <P>SOLUTION: A scheduling section 12 generates mapping control information in which mobiles and the number of transmission sub channels are allocated such that a transmission power amount to be allocated to each transmission antenna, which is the total of transmission power allocated to each of the plurality of mobiles, does not exceed the maximum transmission power of each transmission antenna and the total transmission power amount of the transmission power allocated to each of the plurality of transmission antennas does not exceed the maximum total transmission power of a base station, on the basis of user data and QoS information from a QoS detection section 11, channel quality information from a channel quality information/transmission line information acquisition section 15, and the transmission power to subcarriers configuring the sub channels of the transmission antennas and the total transmission power to be allocated to the subcarriers from a transmission antenna weight calculation section 16, and outputs it to a resource mapping section 13. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a radio base station that performs eigen beam transmission by performing transmission antenna weight control within a range not exceeding the maximum transmission power of each transmission antenna and the maximum total transmission power of the entire base station.

  In recent years, the shortage of radio wave resources in mobile communications has become serious, while the demand for high-speed and high-capacity wireless broadband has been increasing day by day. Under these circumstances, a multiple-input multiple-output (MIMO) communication system has been introduced in mobile communication, wireless LAN, and the like as a technique for dramatically improving the transmission capacity. Also, in mobile communication, etc., Closed that acquires channel information on the transmission side using uplink sounding, high-speed feedback channel, etc., performs transmission antenna weight control for each substream based on the information, and performs eigenbeam transmission -Loop-MIMO is also being rapidly researched and developed for practical use.

  On the other hand, with the introduction of MIMO technology, it is necessary to prepare transmission amplifiers corresponding to the number of antennas. Generally, a transmitter amplifier with a higher maximum output is more expensive, so the maximum output of the transmitter amplifier may be the value obtained by dividing the maximum transmit output of the entire device specified by the laws of each country by the number of transmit antennas. Many. Therefore, when performing transmission antenna weight control, it is necessary to adjust the weight value under the restriction of the maximum output value for each antenna (transmission amplifier).

  In such a background, in a multi-channel communication system using an Orthogonal Frequency Division Multiplexing (OFDM) system, a technique for effectively and efficiently determining the power allocation of each channel has been proposed. (For example, refer to Patent Document 1). A method has been proposed in which power (transmission antenna weight value) is assigned to each subchannel and antenna while taking into account the restriction on the maximum output value for each antenna.

JP 2005-527128 A

  However, the prior art has the following problems. In the conventional inter-antenna power allocation method, it is possible to optimize the power allocation for each subchannel and each antenna by repeatedly executing a complicated calculation formula, which increases circuit scale and processing delay. There was a problem that it was.

  The present invention has been made to solve the above-described problems, and easily determines the transmission power allocation for each subchannel and each transmission antenna while considering the limitation of the maximum output value for each transmission antenna. An object of the present invention is to obtain a radio base station that can be used.

  The radio base station according to the present invention includes a multi-carrier scheme that forms parallel channels in the frequency direction through a plurality of mobile stations within a cell generated by itself, a plurality of transmission antennas, and a plurality of reception antennas, and MIMO A wireless base station that performs multiple access according to a communication method, extracts a QoS class for each mobile device from an IP packet received from the network side, and outputs user data and QoS information, and the QoS detection A scheduling unit for performing a mapping instruction using the user data from the unit, the QoS information, the channel quality information, the transmission power for the subcarriers constituting the subchannel of the transmission antenna, and the total transmission power allocated to the subcarriers; In accordance with the mapping instruction from the scheduling unit, Radio signal processing is performed using the resource mapping unit that maps the data to the downlink logical radio frame, the downlink logical radio frame from the resource mapping unit, and the transmission antenna weight matrix of each subchannel of the plurality of mobile stations, and The baseband processing unit that generates a physical radio frame, and the channel quality information and the transmission path information are acquired from the uplink radio frame demodulated by the baseband processing unit, and the channel quality information is output to the scheduling unit A channel quality information / transmission path information acquisition unit, and a transmission antenna that calculates the total transmission power, the transmission antenna weight matrix, and the transmission power based on the transmission path information from the channel quality information / transmission path information acquisition unit A weight calculator, and the scheduling unit The transmission allocated to each transmission antenna, which is the sum of the transmission power allocated to each of a plurality of mobile stations based on the user data, the QoS information, the channel quality information, the transmission power, and the total transmission power The amount of power does not exceed the maximum transmission power of each transmission antenna, and the transmission power amount that is the sum of the transmission power assigned to each of the plurality of transmission antennas does not exceed the maximum total transmission power of the entire base station. Mapping control information including the transmission antenna weight matrix and assigned to the mobile station and the number of transmission subchannels is generated and output to the resource mapping unit.

  According to the radio base station of the present invention, it is possible to easily determine transmission power allocation for each subchannel and each transmission antenna while taking into consideration the restriction on the maximum output value for each transmission antenna.

It is a figure which shows the structure of the radio | wireless system containing the radio base station which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of the function relevant to the downlink radio frame transmission of the radio base station which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of the scheduling part of the wireless base station which concerns on Embodiment 1 of this invention. It is a figure which shows the mapping to the downlink logical radio frame of the radio base station which concerns on Embodiment 1 of this invention. It is a flowchart which shows operation | movement of the resource allocation determination part of the scheduling part of the radio | wireless base station which concerns on Embodiment 1 of this invention. It is a figure which shows the allocated electric energy for every transmission antenna in case the wireless base station which concerns on Embodiment 1 of this invention respond | corresponds to four transmission antennas. It is a figure which shows the allocation electric energy of the radio base station which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of the radio system of the multi-site environment containing the radio base station which concerns on Embodiment 4 of this invention.

  Hereinafter, preferred embodiments of a radio base station of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
A radio base station according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 is a diagram showing a configuration of a radio system including a radio base station according to Embodiment 1 of the present invention. In the following, in each figure, the same reference numerals indicate the same or corresponding parts.

  In FIG. 1, a radio base station 10 transmits OFDM / orthogonal frequency division multiple access (OFDMA) through a mobile station A21-mobile station D24 within a range of a cell 1 generated by itself, a plurality of transmission antennas, and a plurality of reception antennas. Multiple access is performed by a multi-carrier scheme and a MIMO communication scheme that form parallel channels in the frequency direction such as Orthogonal Frequency Division Multiple Access. In FIG. 1, four mobile devices that perform multiple access are described. However, in the present invention, it is not necessary to consider the restriction on the number of mobile devices.

  FIG. 2 is a block diagram showing a configuration of functions related to downlink radio frame transmission of the radio base station according to Embodiment 1 of the present invention.

  In FIG. 2, the radio base station 10 includes a QoS detection unit 11, a scheduling unit 12, a resource mapping unit 13, a baseband processing unit 14, a channel quality information / transmission path information acquisition unit 15, and a transmission antenna weight calculation. A portion 16 is provided.

  FIG. 3 is a block diagram showing the configuration of the scheduling unit of the radio base station according to Embodiment 1 of the present invention.

  In FIG. 3, the scheduling unit 12 includes a user data storage unit 121, a quality assurance processing unit 122, and a resource allocation determination unit 123.

  Next, the operation of the radio base station according to Embodiment 1 will be described with reference to the drawings.

  FIG. 4 is a diagram showing mapping to the downlink logical radio frame of the radio base station according to Embodiment 1 of the present invention. FIG. 5 is a flowchart showing the operation of the resource allocation determining unit of the scheduling unit of the radio base station according to Embodiment 1 of the present invention. Further, FIG. 6 is a diagram showing the allocated power amount for each transmission antenna when the radio base station according to Embodiment 1 of the present invention supports four transmission antennas. FIG. 7 is a diagram showing the allocated power amount of the radio base station according to Embodiment 1 of the present invention.

  First, the QoS detection unit 11 extracts a QoS (Quality of Service) class for each mobile device from an IP packet received from the network side, and passes user data and QoS information to the scheduling unit 12. In this IP packet, the control message and user data may be separated.

Next, the scheduling unit 12 receives user data and QoS information passed from the QoS detection unit 11, channel quality information passed from the channel quality information / channel information acquisition unit 15, and passed from the transmission antenna weight calculation unit 16. A mapping instruction is given to the resource mapping unit 13 using the transmission power P ⁽ⁱ⁾ _k , the total transmission power P _sc , and the transmission antenna weight matrix of each subchannel of the mobile station 21-24. Detailed operation will be described later.

  Next, the resource mapping unit 13 maps user data to the downlink logical radio frame according to the mapping instruction from the scheduling unit 12 and passes the user data to the baseband processing unit 14. As shown in FIG. 4, the mapping to the downlink logical radio frame is performed by dividing the subchannel in the frequency direction so that the downlink burst (DL Burst) area shown in the uppermost stage is shown in the mobile station 21 and the middle stage in the mobile station 22. The downlink burst (DL Burst) area shown in FIG. 5 may be allocated to the mobile station 23 and the downlink burst (DL Burst) area shown in the lowermost stage may be allocated.

  Next, the baseband processing unit 14 performs radio signal processing using the downlink logical radio frame passed by the resource mapping unit 13 and the transmission antenna weight matrix to generate a downlink physical radio frame. Then, downlink physical radio frames are transmitted from a plurality of transmission antennas. Further, the baseband processing unit 14 performs radio signal processing such as demodulation processing on uplink radio frames transmitted from the mobile devices 21-24 and received by a plurality of receiving antennas, and acquires channel quality information / transmission path information. The processing result is passed to the unit 15.

  The radio signal processing performed by the baseband processing unit 14 includes error correction code decoding, interleaving / deinterleaving, MIMO encoding / decoding, modulation / demodulation such as quadrature phase shift keying (QPSK), and transmission antenna weight. Examples include multiplication processing, inverse discrete Fourier transform (IDFT), OFDM processing by discrete Fourier transform (DFT), and the like.

Here, the transmission antenna weight multiplication process described above refers to a process of multiplying the transmission antenna weight matrix T _k by the transmission substream vector s _k . Note that k indicates the number of a subchannel composed of a plurality of subcarriers, and the subchannel may be composed of one subcarrier.

  The channel quality information / transmission path information acquisition unit 15 performs carrier-to-interference plus noise ratio (CINR) and received signal strength display (CINR) required for transmission of the downlink radio frame from the demodulated uplink radio frame ( Channel quality information such as RSSI (Received Signal Strength Indicator) and transmission path information (transmission path matrix) are extracted, and the former is passed to the scheduling unit 12 and the latter to the transmission antenna weight calculation unit 16. The channel quality information is assumed to have been subjected to processing such as averaging based on values reported from the mobile devices 21-24. The transmission path information may use information reported from the mobile devices 21-24, and in the case of time division duplex (TDD), pilot subcarriers transmitted in uplink radio frames, or The downlink transmission path may be estimated on the radio base station 10 side using the sounding subcarrier, and the transmission path information may be extracted.

The transmission antenna weight calculation unit 16 performs eigenvalue decomposition (singular value decomposition) shown in the following expression (1) on the subchannel average transmission path matrix H _k (the matrix of the number of reception antennas × the number of transmission antennas) to obtain a unitary matrix. get a V _k.

Then, the total transmission power P _sc in the transmission antenna total is assigned to each data subcarrier included in the subchannel. Here, assuming that the total transmission power that can be transmitted by the radio base station 10 is P _total , the transmission power required other than data subcarriers such as pilot signals is P _pilot , and the number of data subcarriers is n, the following equation (2) And That is, the allocated power for each subcarrier is constant.

Next, the power P _sc allocated to each subcarrier is distributed among the substreams according to a power allocation algorithm such as a water filling algorithm, and the allocated power for each substream is determined by the following equation (3). To do.

  Here, m is the number of substreams and is a value that matches the number of transmission antennas. However, the transmission process is not actually performed for the substream with the power allocation “0”. (The determination is performed by the scheduling unit 12 described later.) Thus, the transmission antenna weight matrix is obtained by the following equation (4).

_{Assuming that} the i-th row of the transmission antenna weight matrix T _k is T ⁽ⁱ⁾ _k , the transmission power P ⁽ⁱ⁾ _k for the subcarrier constituting the subchannel k of the transmission antenna number i is given by the following equation (5). Ask.

In order to simplify the calculation of the transmission antenna weight matrix, the transmission antenna weight matrix T _k may be obtained from an average transmission channel matrix of a plurality of subchannels. In this case, the transmission antenna weight matrix T _k having the same value is used among a plurality of subchannels subjected to the averaging process.

The transmission antenna weight calculation unit 16 is used as a calculation result for the transmission power P ⁽ⁱ⁾ _k for the subcarrier constituting the subchannel k of the transmission antenna number i, the transmission antenna weight matrix, and for each antenna and each subcarrier. The number of substreams for which transmission power allocation is “0”, channel quality information estimated after transmission antenna weight processing, and the like are passed to the scheduling unit 12. Note that the transmission power P ⁽ⁱ⁾ _k for the subcarriers constituting the subchannel k of the transmission antenna number i may be obtained from the transmission antenna weight matrix by the scheduling unit 12. The transmission antenna weight matrix T _k may be secured in a memory shared with the baseband processing unit 14, and information passed to the baseband processing unit 14 via the resource mapping unit 13 may be only address information. In addition, the above calculation processing may be performed for necessary mobile devices and subcarriers according to instructions from the scheduling unit 12, or may be calculated in advance for all the mobile devices 21-24 and subchannels. You can leave it.

  Finally, the detailed operation of the scheduling unit 12 will be described with reference to a detailed configuration diagram (block diagram) shown in FIG.

  As shown in FIG. 3, the user data storage unit 121 of the scheduling unit 12 stores user data (User Data) from the QoS detection unit 11 in a queue and stores it according to an instruction from the resource allocation determination unit 123. The processed user data is output to the resource mapping unit 13.

  Further, the quality assurance processing unit 122 determines the priority of the user data based on the QoS information from the QoS detection unit 11, and notifies the resource allocation determination unit 123 of the priority information together with other QoS information.

Further, the resource allocation determining unit 123 transmits the queue user data amount, priority information, QoS information, channel quality information, and transmission power P ⁽ⁱ⁾ _k for subcarriers constituting the subchannel k of the transmission antenna number i. And the total transmission power assigned to each subcarrier based on the total transmission power P _sc assigned to each subcarrier, the transmission power amount assigned to each transmission antenna does not exceed the maximum transmission power of each transmission antenna. The number of mobile stations and transmission subchannels including the transmission antenna weight matrix so that the transmission power amount that is the sum of the transmission power allocated to each of the plurality of transmission antennas does not exceed the maximum total transmission power of the entire base station Is generated and output to the resource mapping unit 13.

  That is, the resource allocation determining unit 123 operates based on the flowchart shown in FIG.

First, in step S101, the resource allocation determining unit 123 sets the remaining transmission power amount P ⁽ⁱ⁾ _rest of each transmission antenna to the maximum transmission power P ^{(i (i} )) of each transmission antenna as shown in the following equation (6). ^{) In addition} to initialization to _ant , the remaining total transmission power amount P _rest of the radio base station 10 is initialized to the base station maximum total transmission power P _total as shown in the following equation (7).

  Next, in step S102, the priority information and other QoS information notified from the quality assurance processing unit 122, the amount of user data (User Data) stored in the queue of the user data storage unit 121, and after the transmission antenna weight processing Based on the transmission antenna weight calculation results such as channel quality information and the number of substreams, the mobile station scheduled for resource allocation and the amount of transmission subchannels (the minimum number of transmission subchannels and the maximum number of transmission subchannels) are determined.

  Next, in step S103, at the time of the above determination (step S102), it is confirmed whether there is a mobile station that can be allocated. If there is no mobile station (NO), the process proceeds to the resource allocation process shown in steps S106 to S109. If there is an assignable mobile device (YES), the process proceeds to the next step S104.

Next, in step S104, the transmission power for the subcarriers constituting the subchannel k of the transmission antenna number i, calculated by the transmission antenna weight calculation unit 16, in order to determine whether power can be allocated to all transmission antennas. Using P ⁽ⁱ⁾ _k , it is confirmed that the number of subchannels that can be allocated, SubCh_Num, in which the following equation (8) is established, is equal to or greater than the minimum number of transmission subchannels determined in step S102. Here, it is assumed that the number of subcarriers constituting one subchannel is Carrier_Num.

  Further, in order to comply with the maximum total transmission power of the radio base station 10, it is confirmed whether the following equation (9) is satisfied.

  When the assignable subchannel number SubCh_Num is equal to or greater than the maximum transmission subchannel number determined in step S102, SubCh_Num = maximum transmission subchannel number. If the above equations (8) and (9) are not satisfied, it is determined that the mobile device has already been assigned a resource, and the process returns to step S102.

  Note that the transmission antenna weight control may be dynamically turned off in accordance with conditions such as the moving speed of the mobile device. In this case, when the number of transmission antennas is m, the following equation (10) is obtained.

  When Expressions (8) and (9), which are the determination expressions in Step S104, are satisfied, resource allocation for the mobile device is determined, the remaining transmission power amount of each transmission antenna, and the remaining total transmission power amount of the radio base station 10 Is updated by the following expressions (11) and (12), and the process returns to step S102.

  FIG. 6 is a diagram illustrating the allocated power amount for each transmission antenna when the radio base station 10 is compatible with four transmission antennas, and FIG. 7 is a diagram illustrating the allocated power amount of the radio base station 10. is there. As shown in FIG. 6, the amount of transmission power assigned to each transmission antenna (# 1-4), which is the sum of transmission power assigned to each of mobile stations A-C, does not exceed the maximum transmission power of each transmission antenna. As shown in FIG. 7 and FIG. 7, the mobile station and the transmission sub-stations are configured so that the transmission power amount, which is the total transmission power allocated to each of the transmission antennas # 1-4, does not exceed the maximum total transmission power of the entire base station. It is necessary to allocate the number of channels. Note that the maximum transmission power of each transmission antenna does not have to be a value obtained by dividing the maximum total transmission power of the entire base station by the number of transmission antennas, and can be freely set according to the restrictions of the transmission amplifier.

  Next, after the processing of steps S101 to S105 is completed, resource allocation is performed using the remaining transmission antennas and transmission power. The surplus transmission power generated when transmission power allocation for eigenbeam transmission is performed is performed by reducing the number of transmission antennas to be used, and the MIMO communication system of other channels or 1-input 1-output (SISO: Single-Input Single). -Output) Used for communication method. Note that the processing in steps S101 to S105 may be performed again after reducing the number of transmission antennas. However, in the first embodiment, for simplicity, resource allocation without performing transmission antenna weight control is performed. As the simplest example, an example in which the remaining power is assigned for each transmission antenna will be described.

  First, in step S106, the resource allocation information for the mobile devices 21-24 is reset, and the priority information and other QoS information notified from the quality assurance processing unit 122, the amount of user data accumulated in the queue, Based on the channel quality information of the transmission antenna and the like, the mobile station scheduled to allocate resources and the amount of transmission subchannels (minimum transmission subchannel number and maximum transmission subchannel number) are determined. At this time, the mobile station to which resources are allocated in step S105 may be excluded from the scheduling candidates.

  Next, in step S107, it is confirmed whether there is a mobile device that can be allocated. If there is no mobile device (NO), the resource allocation process is terminated. If there is an assignable mobile device (YES), the process proceeds to the next step S108.

Next, in step S108, using the total transmission power P _sc allocated to the subcarriers, the number of subchannels that can be allocated SubCh_Num satisfying the following expression (13) is equal to or greater than the minimum number of transmission subchannels determined in step S106. Make sure that there is.

  Further, in order to comply with the maximum total transmission power of the radio base station 10, it is confirmed whether the following equation (14) is satisfied.

  When SubCh_Num is equal to or greater than the maximum transmission subchannel number determined in step S106, SubCh_Num = maximum transmission subchannel number. If the above equations (13) and (14) are not satisfied, it is determined that the mobile device has already been assigned a resource, and the process returns to step S106.

  In Step S109, when Expressions (13) and (14), which are the determination expressions in Step S108, are satisfied, resource allocation for the mobile device is determined, and the remaining transmission power amount of each transmission antenna is determined. The remaining total transmission power amount is updated by the following equations (15) and (16), and the process returns to step S106.

In the example shown in steps S106 to S109, the remaining power is assigned to each transmission antenna. However, the same applies to the case of two or more transmission antennas. When the number of transmission antennas to be used is 1 (el), The allocated power for each transmission antenna and each subcarrier may be P _sc / l (L).

  According to the first embodiment, since iterative processing for determining transmission antenna weights is not required, the circuit scale and processing delay can be reduced when eigenbeam transmission processing is realized. The first embodiment is particularly effective when the value obtained by multiplying the maximum output of the transmission amplifier by the number of transmission antennas used is larger than the maximum total transmission output of the entire radio base station 10, while the maximum output of the transmission amplifier is Therefore, it is possible to suppress the increase in the price of the transmission amplifier.

  Furthermore, this Embodiment 1 also has the characteristic that the fairness between users in power allocation is implement | achieved by allocating transmission power density equally to each mobile station.

Embodiment 2. FIG.
In contrast to the first embodiment, the resource allocation determination unit 123 of the scheduling unit 12 uses the priority information notified from the quality assurance processing unit 122 of the power P _sc in the transmission antenna total allocated to each data subcarrier, It can be variably set for each mobile station according to the transmission antenna weight calculation result and channel quality information.

  According to the second embodiment, it is possible to reduce surplus power, increase the cell communication capacity, or improve the channel quality according to the QoS compared to the first embodiment.

Embodiment 3 FIG.
In contrast to the first embodiment, the mobile station 21-24 performs the process performed by the transmission antenna weight calculation unit 16, quantizes the result, and transmits the uplink signal as the code number.

  According to the third embodiment, there is an effect that the amount of feedback can be significantly reduced, or the radio base station 10 does not require RF calibration between the uplink and the downlink.

Embodiment 4 FIG.
As shown in FIG. 8, eigen beam transmission is performed between radio base stations in cooperation with a mobile device C23 and a mobile device E25 (in a multi-site environment) located in a region where two or more cells 1 and 3 overlap. Also in implementation, inter-antenna power allocation is performed in each radio base station by transmission antenna weight control and resource allocation control similar to those in the first embodiment.

  The difference from the first embodiment is that, in the transmission antenna weight calculation unit 16 of FIG. 2, for the mobile device C23 and the mobile device E25, the number of transmission antennas is multiplied by the number of base stations, that is, the number of base stations is multiplied. It is necessary to calculate the transmission weight vector of the number of rows, and it is necessary for the scheduling unit 12 to reflect the result on the allocated power of each radio base station. Furthermore, it is necessary to acquire transmission path information of other radio base stations from a mobile device or via a network.

  1 cell, 10 radio base station, 11 QoS detection unit, 12 scheduling unit, 13 resource mapping unit, 14 baseband processing unit, 15 channel quality information / transmission path information acquisition unit, 16 transmission antenna weight calculation unit, 21, 22, 23, 24 Mobile device, 121 User data storage unit, 122 Quality assurance processing unit, 123 Resource allocation determination unit.

Claims (5)

A radio base that performs multiple access using a multi-carrier scheme and a MIMO communication scheme that form parallel channels in the frequency direction through a plurality of mobile stations within the range of cells generated by itself, a plurality of transmission antennas, and a plurality of reception antennas Station,
A QoS detection unit that extracts a QoS class for each mobile device from an IP packet received from the network side, and outputs user data and QoS information;
A mapping instruction is performed using the user data from the QoS detection unit, the QoS information, channel quality information, transmission power for subcarriers constituting the subchannel of the transmission antenna, and total transmission power allocated to the subcarriers. A scheduling unit;
In accordance with a mapping instruction from the scheduling unit, a resource mapping unit that maps user data to a downlink logical radio frame;
A baseband processing unit that performs radio signal processing using the downlink logical radio frame from the resource mapping unit and a transmission antenna weight matrix of each subchannel of a plurality of mobile devices, and generates a downlink physical radio frame;
From the uplink radio frame demodulated by the baseband processing unit, acquire the channel quality information and transmission path information, and output the channel quality information to the scheduling unit, channel quality information / transmission path information acquisition unit,
Based on the transmission path information from the channel quality information / transmission path information acquisition unit, the total transmission power, the transmission antenna weight matrix, and a transmission antenna weight calculation unit that calculates the transmission power,
The scheduling unit is a total of transmission power allocated to each of a plurality of mobile stations based on the user data, the QoS information, the channel quality information, the transmission power, and the total transmission power. The transmission power amount assigned to each antenna does not exceed the maximum transmission power of each transmission antenna, and the total transmission power assigned to each of the plurality of transmission antennas is the maximum total transmission power of the entire base station. A radio base station characterized by generating mapping control information to which a mobile station and the number of transmission subchannels are assigned, including the transmission antenna weight matrix controlled so as not to exceed A, and outputting the mapping control information to the resource mapping unit. The scheduling unit uses surplus transmission power generated when transmission power allocation for eigenbeam transmission is performed for a MIMO communication system or SISO communication system of another channel after reducing the number of transmission antennas to be used. The radio base station according to claim 1. The scheduling unit does not perform transmission antenna weight control when determining that it is better not to perform transmission antenna weight control when performing transmission power allocation for eigenbeam transmission. 1. A radio base station according to 1. The radio base station according to claim 1, wherein the scheduling section increases / decreases a total transmission power of transmission antennas allocated to each subcarrier according to the QoS information and the channel quality information. The transmission antenna weight calculation unit calculates the total transmission power, the transmission antenna weight matrix, and the transmission power for a mobile station that performs eigenbeam transmission in a multi-site environment by multiplying the number of transmission antennas by the number of radio base stations. Calculate
The radio base station according to claim 1, wherein the scheduling unit reflects a calculation result of the transmission antenna weight calculation unit in an allocated transmission power of each radio base station.

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