JP2009273167A - Transmitter, receiver, mobile telecommunication system and transmission control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmitter that switches a system between a single carrier wireless access system and a multi-carrier wireless access system, and to provide a receiver, a mobile telecommunication system and a transmission control method. <P>SOLUTION: A transmitter includes a means for switching a wireless access system, a means for generating a signal of frequency region by assigning wireless resources for a spread chip sequence subjected to one of fast Fourier transform or parallel serial conversion according to a switched wireless access system, and a means for generating a transmission signal by performing fast Fourier transform for the signal of frequency region. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a transmission device, a reception device, a mobile communication system, and a transmission control method.

  Development of the fourth generation mobile communication system (4G), which is the next generation mobile communication system of IMT-2000 (International Mobile Telecommunication 2000), is in progress. The fourth generation mobile communication system can flexibly support a multi-cell environment such as a cellular system to an isolated cell environment such as a hot spot area or indoors, and further increase the frequency utilization efficiency in both cell environments. It is desired.

  In the fourth generation mobile communication system, the following radio access system has been proposed for a link from a mobile station to a base station (hereinafter referred to as uplink). In the single carrier transmission system, for example, DS-CDMA (direct sequence code division multiple access) system, IFDMA (Interleaved Frequency Division Multiple Access) system, variable spreading factor and chip repetition factor (VSCRF-CDMA: Variable Spreading and Chip Repetition Factors-CDMA) ) A method has been proposed. In the multicarrier transmission scheme, for example, OFDM (Orthogonal Frequency Division Multiplexing) scheme, Spread OFDM, Multi-Carrier Code Division Multiple Access (MC-CDMA) scheme, VSF-Spread OFDM (Variable Spreading Factor Spread OFDM) ) A method has been proposed.

  In the single carrier scheme, the peak power is small with respect to the power consumption of the terminal, so the back-off of the transmission power amplifier can be reduced and the power efficiency is good.

  As an example of the single carrier method, a VSCRF-CDMA method will be described with reference to FIG. 1 (for example, see Patent Document 1).

  The spreading unit 1 includes a code multiplying unit 2, an iterative combining unit 8 connected to the code multiplying unit 2, and a phase shift unit 10 connected to the iterative combining unit 8.

  The code multiplier 2 multiplies the transmission signal by a spreading code. For example, the multiplier 4 multiplies the transmission signal by a channelization code defined under a given code spreading factor SF. Furthermore, the multiplier 6 multiplies the transmission signal by the scramble code.

  The iterative combining unit 8 compresses the spread transmission signal in time and repeats it a predetermined number of times (CRF times). The transmission signal to which the chip repetition is applied shows a comb-shaped frequency spectrum. The configuration and operation when the number of repetitions CRF is equal to 1 are equal to those in the normal DS-CDMA system.

  The phase shifter 10 shifts (shifts) the phase of the transmission signal by a predetermined frequency uniquely set for each mobile station.

  In the VSCRF-CDMA system, when CRF> 1, for example, when CRF = 4, as shown in FIG. 2A, the frequency spectrum used by each user is distributed in a comb-like shape across the entire band. The In this case, the user-specific frequency offset is smaller than the allocated bandwidth.

  On the other hand, when CRF = 1, as shown in FIG. 2B, the spectrum used by each user is arranged together on the block. In this case, the user-specific frequency offset is greater than the allocated bandwidth.

  In addition, a wireless access method that obtains a comb-shaped frequency spectrum in the frequency domain has been proposed (see, for example, Non-Patent Documents 1 and 2).

  As shown in FIG. 3, the transmission apparatus 30 to which this radio access method is applied includes an FFT unit 12 to which a spread data sequence is input, a rate conversion unit 14 connected to the FFT unit 12, and a rate conversion unit 14. The frequency domain signal generator 16 connected to the IFFT unit 18, the IFFT unit 18 connected to the frequency domain signal generator 16, the GI adder 20 connected to the IFFT unit 18, and the filter 22 connected to the GI adder 20. With.

  The fast Fourier transform (FFT) unit 12 converts the spread data series into a frequency domain by making a block for each Q chip and performing a fast Fourier transform. As a result, Q single-carrier signals are obtained in the frequency domain. Here, the spread data series corresponds to the output signal of the multiplier 6 in the spreading unit 1 described with reference to FIG.

The rate conversion unit 14 repeats the Q single carrier signals a predetermined number of times, for example, CRF times. As a result, N _sub = Q × CRF single carrier signals are generated.

  The frequency domain signal generator 16 shifts the signal of each single carrier on the frequency axis so as to have a comb-like spectrum. For example, when processing corresponding to CRF = 4 is performed, three zeros are arranged between the signals of each single carrier. As a result, the comb-shaped frequency spectrum described with reference to FIGS. 2A and 2B is formed.

  The IFFT unit 18 performs a fast inverse Fourier transform on the comb-shaped spectrum obtained by shifting the signal of each single carrier on the frequency axis.

  The guard interval adding unit 20 adds a guard interval to a signal to be transmitted. The guard interval is obtained by duplicating the beginning or end part of the symbol to be transmitted. The filter 22 performs band limitation on the transmission signal.

  On the other hand, the multicarrier scheme has a long symbol length and can provide good reception quality in a multipath environment by providing a guard interval.

  As an example, an OFDM system will be described with reference to FIG.

  FIG. 4 is a block diagram of a transmission unit used in an OFDM transmission apparatus.

  The transmission unit 40 is connected to the serial / parallel (S / P) conversion unit 32 to which the transmission signal before spreading is input, the subcarrier mapping unit 34 connected to the serial / parallel conversion unit 32, and the subcarrier mapping unit 34. IFFT unit 36, and GI adding unit 38 connected to IFFT unit 36.

  The serial / parallel converter (S / P) 32 converts a serial signal sequence into a plurality of parallel signal sequences.

  The subcarrier mapping unit 34 assigns each signal converted into a parallel signal sequence by the serial / parallel conversion unit 32 to each subcarrier. For example, in order to obtain the frequency diversity effect, the subcarrier mapping unit 34 assigns jumping subcarriers to each user as shown in FIG. 5A. In addition, the subcarrier mapping unit 34 assigns continuous subcarriers to each user as shown in FIG. 5B.

  The fast inverse Fourier (IFFT) converter 36 performs fast inverse Fourier transform on the input signal to perform OFDM modulation.

  The guard interval adding unit 38 adds a guard interval to a signal to be transmitted, and creates a symbol in the OFDM scheme.

JP 2004-297756 A

M. Schnell, I. Broeck, and U. Sorger, "A promising new wideband multiple-access scheme for future mobile communication," European Trans. On Telecommun. (ETT), vol. 10, no. 4, pp.417- 427, July / Aug. 1999. R. Dinis, D. Falconer, C.T. Lam, and M. Sabbaghian, "A Multiple Access Scheme for the Uplink of Broadband Wireless Systems," in Proc. Globecom2004, Dec. 2004.

  However, the background art described above has the following problems.

  Since the single carrier scheme has a small symbol length, there is a problem that reception quality deteriorates due to multipath interference, particularly during high-speed signal transmission.

  In addition, the multicarrier scheme has a problem in that the peak power increases with respect to the power consumption of the terminal, so that it is necessary to increase the backoff and the power efficiency is deteriorated.

  Accordingly, an object of the present invention is to provide a transmission device, a reception device, a mobile communication system, and a transmission control method capable of switching between a single carrier type radio access method and a multicarrier type radio access method.

  In order to solve the above-described problems, a transmission apparatus according to the present invention is a transmission apparatus that can be used in a single-carrier communication system and a multi-carrier communication system, and includes a switching unit that switches a wireless access method, and a switched wireless access Frequency domain signal generation means for allocating radio resources and generating a frequency domain signal for a spread chip sequence that has been subjected to either fast Fourier transform or serial-parallel conversion according to a method, and the frequency domain signal One of the features is that it comprises a transmission signal generation means for performing a fast inverse Fourier transform on the signal to generate a transmission signal.

  With this configuration, a single-carrier wireless access method and a multi-carrier wireless access method can be realized by a common module, and a single-carrier wireless access method and a multi-carrier wireless method can be realized. Communication can be performed with the access method.

  In addition, the receiving device of the present invention includes a wireless access method determining unit that determines a wireless access method used by the transmitting device, and a notification unit that notifies information indicating the determined wireless access method. To do.

  With this configuration, it is possible to determine and notify the radio access scheme used by the transmission apparatus.

  A mobile communication system according to the present invention is a mobile communication system including a transmission device and a reception device that can be used in a single carrier communication system and a multicarrier communication system, and a radio access method used by the transmission device. A wireless access method determining means for determining the information, a notification means for notifying information indicating the determined wireless access method, a switching means for switching the wireless access method, and a fast Fourier transform and serial-parallel according to the switched wireless access method To the chip sequence after spreading performed one of the transforms, radio resources are allocated, frequency domain signal generating means for generating a frequency domain signal, and fast inverse Fourier transform is performed on the frequency domain signal, One of the features is that it includes transmission signal generation means for generating a transmission signal.

  With this configuration, a single-carrier wireless access scheme and a multi-carrier wireless access scheme can be realized by a common module. According to the determined wireless access scheme, a single-carrier wireless access scheme can be realized. Communication can be performed by an access method and a multi-carrier wireless access method.

  The transmission control method of the present invention includes a step in which a receiving device determines a wireless access method to be used, a step in which the receiving device notifies information indicating the determined wireless access method, and a method in which the transmitting device performs wireless access. A step of receiving information indicating a method, a step of the transmission device switching a wireless access method according to the information indicating the wireless access method, and a transmission device performing fast Fourier transform and direct conversion according to the switched wireless access method. A step of allocating radio resources to the spread chip sequence subjected to one of the parallel conversions to generate a frequency domain signal, and a transmitting device performs fast inverse Fourier transform on the frequency domain signal And a step of generating a transmission signal.

  With this configuration, communication can be performed using a single-carrier wireless access method and a multi-carrier wireless access method according to the determined wireless access method.

  According to the embodiments of the present invention, it is possible to realize a transmission device, a reception device, a mobile communication system, and a transmission control method capable of switching between a single carrier type radio access method and a multicarrier type radio access method.

It is a block diagram which shows the spreading | diffusion part used for the transmitter of a VSCRF-CDMA system. It is a figure which shows an example of the frequency spectrum of the transmission signal of a mobile station. It is a figure which shows an example of the frequency spectrum of the transmission signal of a mobile station. It is a partial block diagram which shows the transmitter which performs single carrier transmission. It is a partial block diagram which shows the transmitter which performs multicarrier transmission. It is a figure which shows an example of the frequency spectrum of the transmission signal of a mobile station. It is a figure which shows an example of the frequency spectrum of the transmission signal of a mobile station. It is explanatory drawing which shows a cellular environment. It is explanatory drawing which shows a local area environment. It is a partial block diagram which shows the transmitter concerning one Example of this invention. It is explanatory drawing which shows the switching method of a single carrier system and a multicarrier system. It is explanatory drawing which shows the switching method of a single carrier system and a multicarrier system. It is explanatory drawing which shows the switching method of a single carrier system and a multicarrier system. It is explanatory drawing which shows the transmission method of the signal for uplink propagation path state measurement. It is explanatory drawing which shows the notification of the desired maximum transmission bandwidth of a data channel and a pilot signal. It is explanatory drawing which shows the reception SINR of the signal for a propagation path state measurement estimated when it transmits with the maximum transmission power. It is explanatory drawing which shows transmission power control in case there is no allocation of a data channel and only a propagation path state measurement signal is transmitted. It is explanatory drawing which shows transmission power control in case there exists a data channel allocation. It is explanatory drawing which shows an example of the transmission power control of the signal for a propagation path state measurement in case there exists a data channel allocation. It is explanatory drawing which shows an example of the transmission power control of the signal for a propagation path state measurement in case there exists a data channel allocation. It is explanatory drawing which shows the scheduling of a shared data channel. It is explanatory drawing which shows the scheduling of a shared data channel. It is explanatory drawing which shows the interference from another mobile station. It is explanatory drawing which shows the fluctuation | variation of interference electric power. It is explanatory drawing which shows the fluctuation | variation of interference electric power. It is explanatory drawing which shows the scheduling of a shared data channel. It is explanatory drawing which shows the scheduling of a shared data channel. It is explanatory drawing which shows the scheduling of a shared data channel. It is explanatory drawing which shows allocation of the radio | wireless resource in the transmitter concerning one Example of this invention. It is explanatory drawing which shows allocation of the radio | wireless resource in the transmitter concerning one Example of this invention. It is explanatory drawing which shows allocation of the radio | wireless resource in the transmitter concerning one Example of this invention. It is a partial block diagram which shows the receiver concerning one Example of this invention. It is a partial block diagram which shows the receiver concerning one Example of this invention. It is explanatory drawing which shows the measurement of the reception SINR of the pilot signal which each mobile station transmits in the receiver concerning one Example of this invention. It is explanatory drawing which shows the measurement of the reception SINR of the pilot signal which each mobile station transmits in the receiver concerning one Example of this invention. It is explanatory drawing which shows the allocation of the frequency band for the transmission of the data channel with respect to a mobile station in the receiver concerning one Example of this invention. It is explanatory drawing which shows the allocation of the frequency band for the transmission of the data channel with respect to a mobile station in the receiver concerning one Example of this invention. It is explanatory drawing which shows the allocation of the frequency band for the transmission of the data channel with respect to a mobile station in the receiver concerning one Example of this invention. It is explanatory drawing which shows the allocation of the frequency band for the transmission of the data channel with respect to a mobile station in the receiver concerning one Example of this invention. It is explanatory drawing which shows the allocation of the frequency band for the transmission of the data channel with respect to a mobile station in the receiver concerning one Example of this invention. It is explanatory drawing which shows reallocation of a frequency band. It is explanatory drawing which shows determination of transmission power. It is explanatory drawing which shows determination of transmission power. It is explanatory drawing which shows determination of transmission power. It is explanatory drawing which shows determination of transmission power. It is explanatory drawing which shows designation | designated of MCS at the time of data channel transmission with respect to the mobile station which permitted transmission in the receiver concerning one Example of this invention. It is a partial block diagram which shows the receiver concerning one Example of this invention. It is explanatory drawing which shows designation | designated of the center frequency and bandwidth of the pilot signal of each mobile station in the receiver concerning one Example of this invention. It is explanatory drawing which shows designation | designated of the center frequency and bandwidth of the pilot signal of each mobile station in the receiver concerning one Example of this invention. It is explanatory drawing which shows designation | designated of the center frequency and bandwidth of the pilot signal of each mobile station in the receiver concerning one Example of this invention. It is explanatory drawing which shows allocation of the transmission band of the pilot signal of each mobile station in the receiver concerning one Example of this invention. It is explanatory drawing which shows the measurement of the reception SINR of the pilot signal which each mobile station transmits in the receiver concerning one Example of this invention. It is explanatory drawing which shows designation | designated of MCS at the time of data channel transmission with respect to the mobile station which permitted transmission in the receiver concerning one Example of this invention. It is a flowchart which shows operation | movement of the transmitter concerning one Example of this invention. It is a flowchart which shows operation | movement of the receiver concerning one Example of this invention. It is a flowchart which shows operation | movement of the mobile communication system concerning one Example of this invention.

Next, the best mode for carrying out the present invention will be described based on the following embodiments with reference to the drawings.
In all the drawings for explaining the embodiments, the same reference numerals are used for those having the same function, and repeated explanation is omitted.

  A mobile communication system according to an embodiment of the present invention includes a mobile station and a base station capable of wireless communication with the mobile station.

  A transmission apparatus according to an embodiment of the present invention will be described.

  The transmission device is provided in a mobile station, for example, and transmits an uplink channel.

  The transmission apparatus according to the present embodiment is used in a cellular environment and a local area environment.

Cellular environment, as shown in FIG. 6A, the base station that covers cell (sector), for example, the base station _{200 1,} 200 _2, 200 3, 200 ₄ and 200 _5, allows the base station 200 ₁ and radio communication A mobile station 300 is provided. In the cellular environment, the cell radius is larger than in the local area environment, and the transmission power of the mobile station is increased. Also, the data rate that can be realized in the cellular environment is reduced by interference from surrounding cells.

  Therefore, in the cellular environment, it is more advantageous to use the single carrier scheme as the uplink radio access scheme than to use the multicarrier scheme.

On the other hand, the local area environment, for example indoor, environments such as hot spots, as shown in FIG. 6B, the base station that covers cell (sector), for example, a base station 200 _6, allows the base station 200 ₆ and a radio communication A mobile station 300 is provided. The local area environment has a smaller cell radius than the cellular environment, and the power consumption of the mobile station is reduced. In addition, the data rate that can be realized in a local area environment is relatively large.

  Therefore, in the local area environment, it is more advantageous to use the multicarrier scheme as the uplink radio access scheme than to use the single carrier scheme.

  Next, the transmission apparatus according to the present embodiment will be described with reference to FIG.

  The transmission apparatus 100 according to the present embodiment includes a spreading and channel code unit 102 to which a symbol sequence is input, a switching unit 106 connected to the spreading and channel code unit 102, and a fast Fourier transform connected to the switching unit 106 ( FFT unit 108 and serial / parallel (S / P) conversion unit 110, and rate conversion unit 112 connected to FFT unit 108 and S / P conversion unit 110.

  Further, the transmission apparatus 100 according to the present embodiment includes a frequency domain signal generation unit 114 connected to the rate conversion unit 112, an inverse fast Fourier transform (IFFT) unit 116 connected to the frequency domain signal generation unit 114, and an IFFT. A guard interval (GI) adding unit 118 connected to the unit 116, and a filter 120 connected to the GI adding unit 118.

  The transmission apparatus 100 according to the present embodiment also includes a data modulation / spreading rate / channel coding control unit 104 connected to the spreading and channel code unit 102 and the frequency domain signal generation unit 114, a frequency domain signal generation unit 114, And a connected radio resource allocation control unit 122. The switching unit 106 is connected to the filter 120.

  Further, MCS (Modulation and Coding Scheme) information for each user is input to the data modulation / spreading rate / channel coding control unit 104, and a radio resource allocation control unit 122 is broadcasted indicating radio resource allocation to each physical channel. Information indicating information and a scheduling result for each user is input.

  The data modulation / spreading rate / channel coding control unit 104 determines the spreading rate of the orthogonal code applied in the spreading and channel code unit 102, and determines the orthogonal code of the determined spreading rate and the cell-specific scramble code, Along with the input MCS information for each user, it is input to the spreading and channel code section 102.

  For example, in the cellular cell environment, the data modulation / spreading rate / channel coding control unit 104 determines an orthogonal code of a spreading rate corresponding to the cellular cell environment and a cell-specific scramble code. Also, in the local area environment, the data modulation / spreading rate / channel coding control unit 104 determines an orthogonal code of a spreading rate corresponding to the local area environment and a cell-specific scramble code. Data modulation / spreading rate / channel coding control section 104 inputs the number of subcarrier sets to frequency domain signal generation section 114.

  The spreading and channel code unit 102 applies channel correction by applying an error correction code such as a turbo code or a convolutional code to the input binary information sequence in accordance with the input MCS information, and is channel encoded. Data is modulated. Further, the spreading and channel code unit 102 generates a spread chip sequence by performing spreading processing using the input orthogonal code of the spreading factor and the cell-specific scramble code, and inputs it to the switching unit 106. .

  The switching unit 106 determines whether the information indicating the radio access scheme notified from the base station 200 is a single carrier scheme or a multicarrier scheme. Further, when the switching unit 106 determines that the notified information indicating the radio access method is a single carrier method, the switching unit 106 inputs the input spread chip sequence to the FFT unit 108 and determines that the information is a multicarrier method. If the determination is made, the input spread chip sequence is input to the S / P converter 110. In addition, the switching unit 106 inputs information indicating the notified wireless access method to the filter 120.

  For example, the switching unit 106 determines an access method based on broadcast information from the base station 200. In this case, the base station 200 determines whether to use a single carrier scheme or a multicarrier scheme for each user (mobile station) in a radio access scheme determination unit 402 described later, and as shown in FIG. Control information indicating the determined radio access method is notified.

  Further, for example, the switching unit 106 may determine whether it is a single carrier scheme or a multicarrier scheme based on a radio access scheme determined for each cell. In this case, the radio access scheme determination unit 402 of the receiving device provided in the base station 200 fixedly determines the uplink radio access scheme for each base station in advance according to the cell configuration.

  For example, when the base station 200 is installed, the radio access scheme determination unit 402 determines the radio access scheme to be used according to the cell configuration, for example, the cell radius, the presence / absence of adjacent cells, and the like. For example, when the cell radius is large, the single carrier method is used, and when the cell radius is small, the multicarrier method is used. The radio access determination unit 402 notifies the mobile station 300 of information indicating the determined access method as common control information for all users as shown in FIG.

  By doing in this way, since it determines at the stage in which a base station is installed, a structure and control are easy.

  Further, for example, the switching unit 106 may determine whether it is a single carrier scheme or a multicarrier scheme based on a radio access scheme determined for each user (mobile station). In this case, the access method may be switched according to the distance of each user to the base station, or the access method may be switched according to the transmission power margin of each user.

  For example, when the access method is switched according to the distance to each user's base station 200, for example, a path loss is used as an amount corresponding to the distance to each user's base station 200. In this case, the mobile station 300 measures the path loss on the downlink using, for example, the received power of the downlink pilot signal, and notifies the base station 200 of information indicating the measured bus loss on the uplink.

  When the received path loss value is larger than a predetermined threshold value, the radio access scheme determination unit 402 of the receiving device provided in the base station 200 determines that the distance between the base station 200 and the mobile station 300 is large and determines the single. The mobile station 300 is determined to use the carrier method, and the mobile station 300 is notified as shown in FIG.

  In addition, when the received path loss is smaller than a predetermined threshold, the radio access scheme determination unit 402 of the receiving device provided in the base station 200 determines that the distance between the base station 200 and the mobile station 300 is small, The mobile station 300 is determined to use the carrier method, and the mobile station 300 is notified as shown in FIG.

  In this way, the radio access scheme can be controlled for each mobile station according to the distance between the mobile station and the base station.

  Alternatively, the mobile station may determine whether to use the single carrier scheme or the multicarrier scheme based on the measured path loss, and notify the base station 200 of the result.

  For example, when the access method is switched according to the transmission power margin of each user, for example, the maximum allowable transmission power−the current transmission power is used as a value indicating the transmission power margin of each user. In this case, the mobile station notifies the base station of a value indicating “maximum allowable transmission power−current transmission power”.

  When the received value indicating “maximum allowable transmission power−current transmission power” is smaller than a predetermined threshold, the radio access scheme determination unit 402 of the reception device provided in the base station 200 has a small transmission power margin. And determines to use the single carrier method, and notifies the mobile station 300 as shown in FIG.

  In addition, the radio access scheme determination unit 402 of the receiving device provided in the base station 200 may provide a transmission power margin when the received value indicating “maximum allowable transmission power−current transmission power” is greater than a predetermined threshold. Is determined to be large, the multi-carrier scheme is determined to be used, and the mobile station 300 is notified as shown in FIG.

  In this way, the access method can be controlled according to the capability of each mobile station.

  In addition, the mobile station 300 transmits information indicating the maximum allowable transmission power and information indicating the current transmission power, and the radio access scheme determination unit 402 of the receiving device provided in the base station 200 sets the “maximum allowable transmission power”. -"Current transmission power" may be calculated, and the radio access method may be controlled based on the calculated value.

  Alternatively, the mobile station may determine whether to use the single carrier scheme or the multicarrier scheme based on the transmission power margin and notify the base station 200 of the decision.

  In addition, based on the radio access method determined for each user (mobile station), the switching unit 106 uses a predetermined frequency band desired to be allocated, as shown in FIG. For example, a pilot signal may be transmitted. For example, the switching unit 106 transmits a channel state measurement signal only in a designated frequency band among the frequency bands assigned to the system. Specifically, for example, when a frequency band of 20 MHz is allocated to the system, for example, mobile stations (transmission apparatuses) are classified into those that can transmit at 20 MHz, 10 MHz, and 5 MHz. In this case, the switching unit 106 transmits the propagation path measurement signal only in the frequency band corresponding to the class of the mobile station (transmitting device) based on the radio access scheme determined for each user (mobile station).

  The radio resource allocation determining unit 404 of the receiving apparatus 400 allocates a frequency band to the mobile station (transmitting apparatus) that has transmitted the propagation path measurement signal based on the frequency band in which the propagation path measurement signal is transmitted. Do.

  That is, each mobile station (transmitting device) transmits a pilot signal, the base station (receiving device) measures the pilot signal, measures the propagation path state between the own base station and the mobile station, and assigns a frequency band. Do. The mobile station does not need to transmit a pilot signal to the entire frequency band assigned to the system, and transmits the pilot signal in a predetermined band determined in advance. In the base station, a pilot signal is received from each user. If there is a band to be allocated within the range of the frequency band, the base station allocates the pilot signal, and transmits information indicating the determined frequency band to the transmission apparatus.

  On the receiving device 400 side, the radio access method determination unit 402 may determine a frequency band for transmitting a propagation path state measurement signal and transmit information indicating the frequency band.

  Further, the switching unit 106 includes a pilot signal generation unit, and the pilot signal generation unit is based on a radio access scheme determined for each user (mobile station), and the determined radio access scheme is a single carrier scheme. In addition, at least one of information indicating the desired (maximum) transmission bandwidth of the data channel to the base station, information indicating the amount of data to be transmitted, and information indicating the data rate is transmitted to the base station. It may be. The pilot signal generation unit may transmit information indicating a desired (maximum) transmission bandwidth of the pilot signal to the base station.

  For example, the pilot signal generator includes information indicating the desired (maximum) transmission bandwidth of the pilot signal, information indicating the desired (maximum) transmission bandwidth of the data channel, information indicating the amount of data to be transmitted, and a data rate. At least one piece of information to be shown is transmitted to the base station through the collision-acceptable channel. For example, the maximum transmission bandwidth is 5 MHz, and the desired transmission bandwidth is a value smaller than 5 MHz.

  For example, as shown in FIG. 12A, W_able is the maximum bandwidth that the mobile station can transmit, Wp_req is the desired maximum transmission bandwidth of the pilot signal, and Wd_req is the desired (maximum) transmission bandwidth of the data channel. The pilot signal generation unit determines Wd_req based on the amount of data to be transmitted and the data rate in the range of Wd_req <= W_able. In addition, the pilot signal generation unit determines Wp_req within the range of Wd_req <= Wp_req <= W_able.

Further, the switching unit 106 may set the transmission bandwidth of the propagation path state measurement signal to an integer multiple or 2 ⁿ times the minimum transmission bandwidth determined by the system.

  In this case, the switching unit 106 performs transmission with the maximum transmission bandwidth in which the reception SINR predicted when transmission is performed with the maximum transmission power or “maximum transmission power−ΔP” can exceed the required reception SINR. For example, the switching unit 106 calculates the predicted received SINR based on the average path loss between the base station (receiving device) and the mobile station (transmitting device) and the average interference power in the base station.

  For example, as shown in FIG. 12B, when the maximum transmission bandwidth is 5 MHz and the minimum transmission bandwidth is 1.25 MHz, propagation is performed in each transmission bandwidth, that is, 1.25 MHz, 2.5 MHz, and 3.75 MHz. The transmission bandwidths that satisfy the required SINR of the road state measurement signal are 1.25 MHz and 2.5 MHz. Therefore, the maximum transmission bandwidth that can exceed the required reception SINR is 2.5 MHz.

  In this case, even if transmission is performed with the minimum transmission bandwidth, even if it is predicted that the required SINR cannot be achieved, the transmission bandwidth is not reduced below the minimum transmission bandwidth, and is transmitted with the minimum transmission bandwidth. .

  The required SINR of the channel state measurement signal is reported to the entire cell through the broadcast channel.

  Further, the switching unit 106 may set the required quality for the channel state measurement signal separately from the required quality for the data channel, for example, the required SINR.

  In this case, each required quality is notified from the base station apparatus to the mobile station under the sector using the broadcast channel. For example, the base station apparatus notifies the required quality for the data channel using the dedicated control channel.

  When there is no data channel assignment and only the propagation path state measurement signal is transmitted, switching section 106 performs transmission power control based on the required quality of the propagation path measurement signal. For example, the switching unit 106 performs transmission with transmission power determined by transmission power control based on required quality when only a pilot signal is transmitted. For example, as illustrated in FIG. 12C, the switching unit 106 sets a required quality that is low enough to measure the propagation path state. By doing in this way, the interference by a pilot signal can be reduced and the throughput can be improved as a whole.

  When there is data channel assignment, switching section 106 performs transmission power control based on the required quality of the data channel for both the data section time-multiplexed in the transmission frame and the propagation path state measurement signal section. For example, as illustrated in FIG. 12D, when there is a data channel assignment, the switching unit 106 transmits with the same power as the data unit. In this case, a high required quality is set in the data portion because a highly efficient modulation scheme / coding rate is used. The switching unit 106 transmits a pilot signal with high transmission power because high-accuracy channel estimation is required.

  Specifically, when there is a data channel assignment and the data channel assignment bandwidth is narrower than the transmission bandwidth of the propagation path state measurement signal, the switching unit 106, as shown in FIG. The transmission power of the measurement signal is controlled to a transmission power that satisfies the required quality of the data channel, for example, the required SINR, in the transmission bandwidth of the propagation path state measurement signal.

  When the transmission power has no margin and the required quality cannot be satisfied, the switching unit 106 controls the maximum transmission power as shown in FIG. 12F.

  The base station 200 determines the transmission frequency bandwidth (transmission bandwidth) and the center frequency of the pilot signal transmitted by the mobile station based on information transmitted from the mobile station, for example, the desired (maximum) transmission bandwidth of the pilot signal. Then, the mobile station is notified of information indicating the determined transmission bandwidth of the pilot signal and information indicating the center frequency.

  The pilot signal generation unit transmits a pilot signal according to the notified information indicating the transmission bandwidth and the information indicating the center frequency. In addition, when the frequency block ID is notified, the pilot signal generation unit transmits the pilot signal according to the transmission bandwidth and the center frequency specified by the notified frequency block ID. In this case, the pilot signal generation unit may transmit the pilot signal by a frequency hopping method. Further, the pilot signal generation unit may change the band to be transmitted for each designated band and transmit the pilot signal by frequency hopping.

  The FFT unit 108 converts the spread data series into blocks for each Q chip and performs fast Fourier transform to convert the data series into the frequency domain, and inputs it to the rate conversion unit 112. As a result, Q single-carrier signals are obtained in the frequency domain.

  The serial-parallel conversion unit (S / P) 110 converts a serial signal sequence (stream) every Q pieces into a plurality of parallel signal sequences and inputs them to the rate conversion unit 112.

The rate conversion unit 112 repeats the Q single carrier signals output from the FFT unit 108 a predetermined number of times, for example, CRF times. As a result, N _sub = Q × CRF single carrier signals are generated. Further, the rate conversion unit 112 inputs the parallel Q signal sequences output from the serial / parallel conversion unit (S / P) 110 to the frequency domain signal generation unit 114.

  On the other hand, the radio resource allocation control unit 122 assigns frequency blocks to be allocated to each physical channel based on broadcast information notified from the base station 200 indicating radio resource allocation to each physical channel and information indicating a scheduling result for each user. And control the time.

  Further, the radio resource allocation control unit 122, when allocating a frequency block and time to each physical channel, for a certain time with a transmission time interval (TTI) length of a plurality of frequency blocks as a unit, You may make it control so that a resource may be allocated.

  Here, scheduling of the shared data channel will be described with reference to FIGS. As will be described later, the shared data channel is allocated based on scheduling in the base station 200.

  As shown in FIG. 13, the frequency block is allocated based on scheduling control information in the time domain in frequency division multiple access in which a fixed frequency is allocated. In this case, a plurality of frequency blocks are allocated to a user with a high data rate. In this way, each user uses only a pre-assigned frequency block. For this reason, it is not necessary for transmitting apparatus 100 to transmit in advance pilot channels of other frequency blocks that are transmitted so that receiving apparatus 400 can measure channel state information (CQI: Channel Quality Indicator).

  The bandwidth of the optimal frequency block is, for example, 1.25-5 MHz. By widening the bandwidth of the frequency block, the effect of multiuser diversity can be increased within the frequency block.

  When single carrier transmission is performed, the bandwidth allocated to each user may be variable according to the data rate.

  Further, when the traffic size of a certain user is larger than the payload size of the frequency block, one frequency block may be exclusively used by one user.

  Narrower FDMA (localized FDMA) located on the frequency block is used by multiple low data rate users. That is, as described with reference to FIGS. 2A and 2B, the spectrum used by each user is arranged on the block and arranged in the frequency block. Further, the frequency spectrum used by each user may be distributed in a comb-like shape across the frequency block. Other users use the comb-like spectrum. Localized FDMA may be mainly used for shared data channels.

  Further, as shown in FIG. 14, one band, for example, a frequency block may be assigned to a plurality of users. In this case, frequency multiplexing using a comb-shaped frequency spectrum or a plurality of users are multiplexed in one frame as described below. In the TTI, chip information is stored in a unit of time in a time division manner. The frequency to be transmitted is changed with this chip information as a unit. In this way, a plurality of users are assigned to a certain band and transmitted using frequency hopping. Thus, by assigning a certain frequency band to a plurality of users, interference from other cells (sectors) can be averaged. For this reason, in a certain frequency band, fluctuations in interference from other cells (sectors) can be made smaller in time than when switching between users for transmission.

For example, as shown in FIG. 15, a sector of the areas covered by the base station 200 is 3, is constituted by the sector ₂₅₀ 1, 250 ₂ and 250 _3, the mobile station A300 ₁ is within the area covered by the sector 250 _1, sector 250 ₃ illustrates a case where the mobile station B 300 ₂ , the mobile station C 300 _{3, the} mobile station D 300 _4, and the mobile station E 300 ₅ are located.

  When a frequency block is allocated for each user, the interference power increases when another mobile station exists near the mobile station in the adjacent sector, and the interference power is small even when another user exists at a far position.

For example, for the mobile station A300 ₁ is located in the sector 250 _1, exists in the adjacent sector 250 _3, interference power from the mobile station D300 ₄ that is located near the mobile station A300 ₁ is increased, far interference power from the mobile station E300 _5, which is located is small. Therefore, as shown in FIG. 16A, the interference power varies with time.

  On the other hand, when frequency multiplexing or frequency hopping using a comb-shaped frequency spectrum is performed, the total interference power is averaged and becomes almost constant as shown in FIG. . In this case, although the transmission power per user becomes small, the efficiency per user does not change by continuously assigning it over a plurality of time slots, and the fluctuation of interference from other cells (sectors) becomes small.

  Further, as shown in FIG. 17, the frequency block may be allocated based on scheduling control information in the time domain and the frequency domain.

  In this case, a pilot channel transmitted for receiving apparatus 400 to measure channel state information (CQI: Channel Quality Indicator) is transmitted on all frequency blocks. That is, it is transmitted over all channel bandwidths.

  When the traffic size of a certain user is larger than the payload size of the frequency block, one frequency block is exclusively used by one user.

  When there are a plurality of users with a low data rate, one frequency block is used by a plurality of users. In this case, an orthogonal frequency spectrum, ie, a narrower FDMA (localized FDMA) or a distributed FDMA arranged on the frequency block, is applied in the same frequency block. That is, as described with reference to FIGS. 2A and 2B, the spectrum used by each user is arranged on the block and arranged in the frequency block. Further, the frequency spectrum used by each user may be distributed in a comb-like shape across the frequency block. By doing so, multi-user interference can be reduced.

  For example, the optimum frequency block bandwidth is 0.3125-1.25 MHz. By narrowing the bandwidth of the frequency block, channel scheduling in the frequency domain can increase the effect of multiuser diversity.

  When single carrier transmission is performed, the bandwidth allocated to each user may be variable according to the data rate.

  Narrower FDMA (localized FDMA) located on the frequency block is used by multiple low data rate users.

  Further, when scheduling is performed in the time domain and the frequency domain, the frequency blocks may be grouped. By doing so, the overhead of the pilot channel can be reduced.

  Further, as shown in FIG. 18, the bandwidth may be changed based on the propagation path state. For example, the frequency band assigned to the system is divided and assigned to a plurality of frequency blocks. In this case, when the propagation state is good, a plurality of frequency blocks, for example, two frequency blocks are allocated (users A, B and C), and when the propagation state is not good, there are fewer frequency blocks than the good case. Assigned (user D). Single carrier transmission is performed in the frequency band assigned in this way. By doing in this way, the whole efficiency can be improved.

  The grouping of frequency blocks will be described with reference to FIG.

  Without frequency block grouping, a narrower FDMA (combined FDMA) or comb-shaped spectrum located on the frequency block is used by multiple low data rate users.

  When grouping frequency blocks, there are a case where discrete frequency blocks are grouped (Distributed grouping) and a case where consecutive frequency blocks are grouped (Localized grouping).

  In this way, the overhead of pilot channels used for CQI measurement can be reduced by grouping frequency blocks in advance and performing frequency domain scheduling.

  For example, the radio resource allocation determination unit 404 of the receiving device provided in the base station 200 converts the frequency and time allocated to a collision-type channel (Contention-based channel) such as a random access channel and a reserved packet channel into a channel load or the like. Accordingly, the mobile station is notified using a downlink broadcast channel. For example, when the signal to be transmitted is a collision-type channel, the radio resource allocation determination unit 404 determines to allocate the radio resource so as to use at least a part of the allocated frequency band.

  Also, the radio resource allocation determination unit 404 of the receiving device provided in the base station 200 performs scheduling according to the channel state, and the frequency and time allocated to a scheduling type channel (Scheduled channel) such as a shared data channel. And notifies each mobile station via a downlink broadcast channel. In the shared data channel, traffic data and layer 3 control messages are transmitted. Moreover, you may make it apply H-ARQ (hybrid automatic repeat request), when communicating using a shared data channel.

  The radio resource allocation determination unit 404 of the receiving device provided in the base station 200 performs scheduling and a frequency allocated to a scheduling type channel, for example, a channel for transmitting control information (hereinafter referred to as a shared control channel). Time is determined and notified to each mobile station through a downlink broadcast channel.

  The radio resource allocation control unit 122 performs control so that the collision channel and the scheduling channel are multiplexed. For example, as shown in FIG. 20A, the radio resource allocation unit 122 performs control so that the collision channel and the scheduling channel are time-multiplexed. In this case, the radio resource allocation control unit 122 may perform adaptive TTI length control and set the TTI length longer. By doing so, the ratio of the shared control channel to the total length of the TTI can be reduced, so that the overhead of the shared control channel can be reduced.

  Further, for example, the radio resource allocation unit 122 may perform control so as to frequency multiplex the collision type channel and the scheduling type channel as illustrated in FIG. 20B.

  Further, for example, the radio resource allocation unit 122 may control the collision channel and the scheduling channel so as to mix time multiplexing and frequency multiplexing as shown in FIG. 20C. In this case, the radio resource allocation control unit 122 may perform adaptive TTI length control and set the TTI length longer. By doing so, the ratio of the shared control channel to the total length of the TTI can be reduced, so that the overhead of the shared control channel can be reduced.

  The frequency domain signal generation unit 114 shifts the signal of each single carrier on the frequency axis so as to obtain a comb-like spectrum. For example, when processing corresponding to CRF = 4 is performed, three zeros are arranged between signals or signal sequences of each single carrier. Further, the frequency domain signal generation unit 114 allocates radio resources to each physical channel according to the type of physical channel according to the input radio resource allocation information. When the single carrier method is used in this way, the number of users is changed by changing the CRF value and the offset value for shifting the signal of each single carrier.

  Further, the frequency domain signal generation unit 114 performs mapping for each of the Q signal sequences in parallel, directly places the signal sequence in the frequency component, and allocates radio resources for each mapped signal.

  The IFFT unit 116 performs a fast inverse Fourier transform on the comb-shaped spectrum obtained by shifting the signal of each single carrier on the frequency axis, and generates a single-carrier transmission spectrum waveform.

  Also, IFFT section 116 performs fast inverse Fourier transform on a multicarrier signal composed of a plurality of subcarriers, performs OFDM modulation, and generates a multicarrier transmission spectrum waveform.

  A guard interval (GI) adding unit 118 adds a guard interval to a signal to be transmitted, and creates one symbol of a single carrier scheme and a multicarrier scheme. The guard interval is obtained by duplicating the beginning or end part of the symbol to be transmitted.

  The filter performs band limitation based on information indicating the wireless access method notified by the switching unit 106. Band-limited signals are transmitted.

  Next, the receiving apparatus 400 according to the present embodiment will be described with reference to FIG.

  The receiving apparatus 400 is provided in a base station, for example, and transmits a downlink channel.

  The receiving apparatus according to the present embodiment is used in the cellular environment and the local area environment described above.

  Next, the receiving apparatus 400 according to the present embodiment can receive signals transmitted by single-carrier and multi-carrier wireless access methods. In addition, the receiving apparatus 400 includes a radio access method determination unit 402 and a radio resource allocation determination unit 404.

  The radio access method determination unit 402 determines a radio access method to be used by the mobile station 300 based on the environment where the own receiving device 400 is installed.

  For example, when the installed environment is a cellular cell environment, the radio access determination unit 402 determines to use the single carrier method and notifies the mobile station 300 of it. For example, when the installed environment is a local area environment, the radio access determination unit 402 determines to use the multicarrier scheme and notifies the mobile station 300 of it.

  For example, when the base station 200 is installed, the radio access scheme determination unit 402 determines the radio access scheme to be used according to the cell configuration, for example, the cell radius, the presence / absence of adjacent cells, and the like. For example, when the cell radius is large, the single carrier method is used, and when the cell radius is small, the multicarrier method is used. The radio access determination unit 402 notifies the mobile station 300 of information indicating the determined access method as common control information for all users.

  By doing in this way, since it determines at the stage in which a base station is installed, a structure and control are easy.

  Further, the access method may be switched according to the distance of each user to the base station, or the access method may be switched according to the transmission power margin of each user.

  For example, when the access method is switched according to the distance to each user's base station 200, for example, a path loss is used as an amount corresponding to the distance to each user's base station 200. In this case, the mobile station 300 measures the path loss on the downlink using, for example, the received power of the downlink pilot signal, and notifies the base station 200 of information indicating the measured bus loss on the uplink.

  When the received path loss value is larger than a predetermined threshold, the radio access method determination unit 402 determines that the distance between the base station 200 and the mobile station 300 is large and determines to use the single carrier method. The mobile station 300 is notified.

  Further, when the received path loss is smaller than a predetermined threshold, the radio access scheme determination unit 402 determines that the distance between the base station 200 and the mobile station 300 is small and determines to use the multicarrier scheme. The mobile station 200 is notified.

  In this way, the radio access scheme can be controlled for each mobile station according to the distance between the mobile station and the base station.

  For example, when the access method is switched according to the transmission power margin of each user, for example, the maximum allowable transmission power−the current transmission power is used as a value indicating the transmission power margin of each user. In this case, the mobile station notifies the base station of a value indicating “maximum allowable transmission power−current transmission power”.

  When the received value indicating “maximum allowable transmission power−current transmission power” is smaller than a predetermined threshold, radio access scheme determination section 402 determines that the transmission power margin is small and uses the single carrier scheme. This is determined and notified to the mobile station 300.

  Further, when the received value indicating “maximum allowable transmission power−current transmission power” is larger than a predetermined threshold, the radio access scheme determination unit 402 determines that the transmission power margin is large, and determines the multicarrier scheme. It decides to use, and notifies the mobile station 300.

  In this way, the access method can be controlled according to the capability of each mobile station.

  Further, the mobile station 300 transmits information indicating the maximum allowable transmission power and information indicating the current transmission power, and the radio access scheme determination unit 402 calculates “maximum allowable transmission power−current transmission power”, Based on this calculated value, the radio access method may be controlled.

  The radio resource allocation determination unit 404 determines radio resource allocation to each physical channel and notifies the mobile station 300 of it.

  Also, the radio resource allocation unit 404 performs scheduling for each user and notifies the mobile station 300 of the result.

  When allocating frequency blocks and times to each physical channel, the radio resource allocation control unit 404 allocates radio resources for a certain time in units of TTI (Transmission Time Interval) lengths of a plurality of frequency blocks. Also good.

  In addition, the radio resource allocation unit 404 performs scheduling for the shared data channel.

  As illustrated in FIG. 13, the radio resource allocation unit 404 performs scheduling in the time domain in frequency division multiple access where frequencies are fixedly allocated, and generates control information. In this case, a plurality of frequency blocks are allocated to a user with a high data rate. In this way, each user uses only a pre-assigned frequency block. For this reason, the transmitting apparatus 100 does not need to previously receive pilot channels of other frequency blocks that are transmitted so that the receiving apparatus 400 can measure channel state information (CQI: Channel Quality Indicator).

  For example, the optimum frequency block bandwidth is 1.25 to 5 MHz. By widening the bandwidth of the frequency block, the effect of multiuser diversity can be increased within the frequency block.

  When single carrier transmission is performed, the bandwidth allocated to each user may be variable according to the data rate.

  Further, when the traffic size of a certain user is larger than the payload size of the frequency block, one frequency block may be exclusively used by one user.

  Further, as shown in FIG. 17, the bandwidth may be changed based on the propagation path state.

  A narrower FDMA (localized FDMA) located on the frequency block may be used by multiple low data rate users. That is, as described with reference to FIGS. 2A and 2B, the spectrum used by each user is arranged on the block and arranged in the frequency block. Further, the frequency spectrum used by each user may be distributed in a comb-like shape across the frequency block. Other users use the comb-like spectrum. Localized FDMA may be mainly used for shared data channels.

  Further, as shown in FIG. 18, the radio resource allocation unit 404 may perform scheduling in the time domain and the frequency domain to generate control information.

  In this case, a pilot channel transmitted to measure channel state information (CQI: Channel Quality Indicator) is transmitted on all frequency blocks. That is, it is transmitted over all channel bandwidths.

  When the traffic size of a certain user is larger than the payload size of the frequency block, one frequency block is exclusively used by one user.

  When there are a plurality of users with a low data rate, one frequency block is used by a plurality of users. In this case, an orthogonal frequency spectrum, ie, a narrower FDMA (localized FDMA) or a distributed FDMA arranged on the frequency block, is applied in the same frequency block. That is, as described with reference to FIGS. 2A and 2B, the spectrum used by each user is arranged on the block and arranged in the frequency block. Further, the frequency spectrum used by each user may be distributed in a comb-like shape across the frequency block. By doing so, multi-user interference can be reduced.

  For example, the optimum frequency block bandwidth is 0.3125-1.25 MHz. By narrowing the bandwidth of the frequency block, channel scheduling in the frequency domain can increase the effect of multiuser diversity.

  When single carrier transmission is performed, the bandwidth allocated to each user may be variable according to the data rate.

  A narrower FDMA (localized FDMA) located on the frequency block may be used by multiple low data rate users.

  In this case, the frequency blocks may be grouped. By doing so, the overhead of the pilot channel can be reduced.

  Further, as shown in FIG. 14, one band, for example, a frequency block may be assigned to a plurality of users. In this case, frequency multiplexing using a comb-shaped frequency spectrum, or a plurality of users are multiplexed in one frame as described below. In the TTI, chip information is stored in a unit of time in a time division manner. The frequency to be transmitted is changed with this chip information as a unit. In this way, a plurality of users are assigned to a certain band and transmitted using frequency hopping. By assigning a certain frequency band to a plurality of users in this way, interference from other cells (sectors) can be averaged. For this reason, rather than switching and transmitting users in a certain frequency band. Interference fluctuations from other cells (sectors) can be reduced in time.

  The grouping of frequency blocks will be described with reference to FIG.

  Without frequency block grouping, a narrower FDMA (combined FDMA) or comb-shaped spectrum located on the frequency block is used by multiple low data rate users.

  When grouping frequency blocks, there are a case where discrete frequency blocks are grouped (Distributed grouping) and a case where consecutive frequency blocks are grouped (Localized grouping).

  In this way, the overhead of pilot channels used for CQI measurement can be reduced by grouping frequency blocks in advance and performing frequency domain scheduling.

  For example, the radio resource allocation determination unit 404 determines the frequency and time allocated to a collision-type channel (Contention-based channel), for example, a random access channel and a reserved packet channel, according to the channel load and the like, and broadcasts the downlink Notify each mobile station on the channel. For example, when the signal to be transmitted is a collision-type channel, the radio resource allocation determination unit 404 determines to allocate the radio resource so as to use at least a part of the allocated frequency band.

  The radio resource allocation determining unit 404 performs scheduling according to the channel state, determines a frequency and time allocated to a scheduling type channel (Scheduled channel), for example, a shared data channel, and the like, and a downlink broadcast channel To notify each mobile station. In the shared data channel, traffic data and layer 3 control messages are transmitted.

  For example, the radio resource allocation determination unit 404 groups and allocates channels based on the channel state, for example, the CQI measurement result. By doing so, the overhead of the pilot channel can be reduced.

  Moreover, you may make it apply H-ARQ (hybrid automatic repeat request), when communicating using a shared data channel.

  Also, the radio resource allocation determining unit 404 performs scheduling, determines a frequency and time allocated to a scheduling type channel, for example, a shared control channel, and notifies each mobile station via a downlink broadcast channel.

  Next, the configuration of a receiver that performs allocation so as to change the bandwidth based on the propagation path state will be described in detail with reference to FIG.

  The receiver 400 has the same configuration as the receiver described with reference to FIG.

  The radio resource allocation determination unit 404 of the receiver 400 includes a reception characteristic measurement unit 406, a ranking unit 408 connected to the reception characteristic measurement unit 406, a frequency block allocation unit 410 connected to the ranking unit 408, and a frequency block A transmission power determination unit 412 connected to the allocation unit 410 and an MCS determination unit 414 connected to the transmission power determination unit 412 are provided.

  The reception characteristic measurement unit 406 measures reception characteristics in each frequency block, for example, reception SINR, for all users. All users transmit pilot signals over the entire band. The reception characteristic measurement unit 406 measures the reception state of each band, for example, reception SINR. Further, as shown in FIG. 23A, the reception characteristic measurement unit 406 is determined in advance when the user transmits a pilot signal using a partial frequency band of the entire band (system bandwidth). The received SINR is measured for each frequency band allocation unit, for example, for each frequency block. That is, reception characteristic measurement section 406 measures the reception characteristic of the transmitted pilot signal using a predetermined frequency band allocation unit as a measurement unit.

  Also, as shown in FIG. 23B, reception characteristic measurement section 406 measures the reception state in the band when the user transmits a pilot signal using a part of the entire frequency band. You may do it. That is, reception characteristic measuring section 406 measures the reception characteristic of the transmitted pilot signal using a desired allocation unit, for example, the transmission frequency of the pilot signal as a measurement unit.

  The ranking unit 408 obtains priorities based on the measured reception characteristics and rearranges them in a predetermined order. For example, rearrangement is performed in descending order of reception SINR, and a ranking table is created. The ranking unit 408 also receives the pilot signal transmitted from each mobile station at the base station, that is, the reception power of the propagation path state measurement signal at the receiver, the type of data to be transmitted from each mobile station, and the transmission. The ranking table may be created based on at least one of the waiting time and the maximum transmission power of each mobile station. As a result, the mobile station to which the frequency band is allocated is determined for each frequency band allocation unit.

  The frequency block allocation unit 410 allocates frequency blocks based on the created ranking table. For example, the frequency block allocation unit 410 refers to a ranking table and performs temporary allocation of frequency blocks corresponding to users with high priority. The frequency block allocation unit 410 allocates a frequency block temporarily allocated to a user corresponding to the maximum priority and an adjacent frequency block. Further, the frequency block allocation unit 410 creates a rearranged ranking table in the order of priority again, except for the priority corresponding to the allocated user and the frequency block, and performs the same processing. In this way, continuous frequency bands are assigned to the same device based on the reception characteristics for each transmission device.

  In this case, as shown in FIG. 24A, the frequency block allocation unit 410 allocates a frequency band within the range of the transmission frequency of the pilot signal. Furthermore, as shown in FIG. 24B, the frequency block allocation unit 410 may allocate the frequency band in a frequency band allocation unit, for example, an integer multiple of the frequency block.

  Further, when the mobile station transmits a pilot signal by performing frequency popping for each band allocation unit, the frequency block allocation unit 410 performs scheduling for the band in which the pilot is transmitted, as shown in FIG. 25A. And data channel allocation may be performed. Further, it is specified that the band for transmitting the pilot signal is shifted with the passage of time. In this case, frequency allocation section 410 determines a data channel for each band in which the pilot signal is transmitted. In this case, the scheduling cycle becomes longer.

  For example, at time t (Time t), all mobile stations, for example, MS1, MS2, MS3 and MS4 transmit pilot signals in the same band. The frequency block allocation unit 410 performs scheduling between mobile stations that have transmitted pilot signals in the same band. In this case, scheduling is performed among MS1, MS2, MS3, and MS4, and a data channel is assigned to MS3.

  At time t + 1 (Time t + 1), MS1, MS2, MS3, and MS4 transmit pilot signals in a band different from the band in which the pilot signal was transmitted at time t. For example, MS1, MS2, MS3, and MS4 transmit pilot signals in a band adjacent to the band in which the pilot signal was transmitted at time t. The frequency block allocation unit 410 performs scheduling between mobile stations that have transmitted pilot signals in the same band. In this case, scheduling is performed among MS1, MS2, MS3, and MS4, and a data channel is assigned to MS2.

  At time t + 2 (Time t + 2), MS1, MS2, MS3, and MS4 transmit pilot signals in a band different from the band in which the pilot signal was transmitted at time t + 1. For example, MS1, MS2, MS3, and MS4 transmit pilot signals in a band adjacent to the band in which the pilot signal was transmitted at time t + 1. The frequency block allocation unit 410 performs scheduling between mobile stations that have transmitted pilot signals in the same band. In this case, scheduling is performed among MS1, MS2, MS3, and MS4, and a data channel is assigned to MS2. Thereafter, data channel allocation is performed in the same manner.

  When each mobile station independently transmits a pilot signal by frequency popping, the frequency block allocation unit 410 transmits a pilot signal in that band for each frequency allocation unit as shown in FIG. 25B. Scheduling may be performed between existing mobile stations to allocate data channels. For example, a certain mobile station is assigned a band adjacent to an already allocated band.

  For example, at time t (Time t), mobile stations such as MS3, MS4, MS4 and MS6 transmit pilot signals in different bands, and MS1 transmits a pilot signal in a band where MS3 and MS4 transmitted pilot signals. MS2 transmits a pilot signal in a band in which MS5 and MS6 transmit the pilot signal.

  The frequency block allocation unit 410 performs scheduling between mobile stations that have transmitted pilot signals in each band. The frequency block allocation unit 410 performs scheduling for each band allocation unit. For example, the frequency block allocation unit 410 performs scheduling between MS1 and MS3, allocates a data channel to MS1, schedules between MS1 and MS4, allocates a data channel to MS4, and transmits between MS2 and MS5. Scheduling is performed to assign a data channel to MS5, and scheduling is performed between MS2 and MS6 to assign a data channel to MS6.

  At time t + 1 (Time t + 1), the mobile stations, for example, MS3, MS4, MS4 and MS6 transmit pilot signals in different bands. For example, the pilot signal is transmitted in a band adjacent to the band in which the pilot signal is transmitted at time t. In addition, mobile stations such as MS1 and MS2 transmit pilot signals in mutually different bands. For example, the pilot signal is transmitted in a band adjacent to the band in which the pilot signal is transmitted at time t.

  The frequency block allocation unit 410 performs scheduling between mobile stations that have transmitted pilot signals in each band. The frequency block allocation unit 410 performs scheduling for each band allocation unit. For example, the frequency block allocation unit 410 performs scheduling between MS2 and MS6, allocates a data channel to MS2, schedules between MS2 and MS3, allocates a data channel to MS2, and transmits between MS1 and MS4. Scheduling is performed to assign a data channel to MS4, and scheduling is performed between MS1 and MS5 to assign a data channel to MS5.

  At time t + 2 (Time t + 2), the mobile stations, for example, MS3, MS4, MS4 and MS6 transmit pilot signals in different bands. For example, the pilot signal is transmitted in a band adjacent to the band in which the pilot signal is transmitted at time t + 1. In addition, mobile stations such as MS1 and MS2 transmit pilot signals in mutually different bands. For example, the pilot signal is transmitted in a band adjacent to the band in which the pilot signal is transmitted at time t + 1.

  The frequency block allocation unit 410 performs scheduling between mobile stations that have transmitted pilot signals in each band. The frequency block allocation unit 410 performs scheduling for each band allocation unit. For example, the frequency block allocation unit 410 performs scheduling between MS1 and MS5, allocates a data channel to MS5, performs scheduling between MS1 and MS6, allocates a data channel to MS6, and transmits between MS2 and MS3. Scheduling is performed to assign a data channel to MS2, and scheduling is performed between MS2 and MS4 to assign a data channel to MS4.

  In addition, when each mobile station independently transmits a pilot signal by frequency hopping, as shown in FIG. 25C, the frequency block allocating unit 410 has a reception characteristic (reception quality) of a band in which no pilot is transmitted. Data channels may be allocated in each frequency allocation unit using past reception quality. In this case, there may be a plurality of mobile stations that transmit pilots in the same frequency band.

  For example, at time t (Time t), mobile stations such as MS1, MS2, MS3, and MS4 transmit pilot signals in different bands.

  The frequency block allocation unit 410 performs scheduling between mobile stations that have transmitted pilot signals in each band. The frequency block allocation unit 410 performs scheduling for each band allocation unit.

  At time t + 1 (Time t + 1), mobile stations, for example, MS1, MS2, MS3 and MS4 transmit pilot signals in different bands. For example, the pilot signal is transmitted in a band adjacent to the band in which the pilot signal is transmitted at time t.

  The frequency block allocation unit 410 performs scheduling between mobile stations that have transmitted pilot signals in each band. The frequency block allocation unit 410 uses the past reception quality as the reception characteristic (reception quality) of the band in which no pilot signal is transmitted, and performs scheduling for each band allocation unit.

  At time t + 2 (Time t + 2), the mobile stations, for example, MS1, MS2, MS3, and MS4 transmit pilot signals in different bands. For example, the pilot signal is transmitted in a band adjacent to the band in which the pilot signal is transmitted at time t + 1.

  The frequency block allocation unit 410 performs scheduling between mobile stations that have transmitted pilot signals in each band. The frequency block allocation unit 410 uses the past reception quality as the reception characteristic (reception quality) of the band in which no pilot signal is transmitted, and performs scheduling for each band allocation unit.

  When the fluctuation of the propagation path state is small, if the band for transmitting the pilot signal is fixed, the reception characteristic remains poor when the propagation path state of the band is bad. In this way, the reception characteristics in the base station can be improved by changing the band for transmitting the pilot signal.

Also, when a data channel is allocated to a frequency allocation band, as shown in FIG. 26, the allocated band is not changed unless the reception state exceeds a certain amount of change. That is, the frequency block allocating unit 410 is the same until the received power of the channel state measurement signal of the allocated transmitting apparatus in the frequency band that has been allocated changes beyond a predetermined threshold. The frequency band is continuously allocated to the transmitting stations in time. By doing so, fluctuations in interference from other cells (sectors) can be reduced. In the receiver 400, the modulation scheme and the like are changed according to the reception state before application of AMC. If the state changes after the determination of the modulation method, etc., it cannot be received correctly. That is, in the uplink, the reception state is caused by interference from other cells (sectors), particularly interference from nearby users. For example, in FIG. 15, when the mobile station A300 ₁ is transmitting, when the mobile station D300 ₄ that exists in the adjacent sector 250 ₃ is transmitting, the mobile station A300 _1, the mobile station affected by the interference from the D300 _4.

Further, when the mobile station A300 ₁ is transmitting, when the mobile station B300 ₂ that exists in the adjacent sector 250 ₃ is transmitting, the mobile station A300 ₁ is from the mobile station B300 ₂ Affected by interference. Mobile station A300 _1, depending on the ratio of the desired wave and the interference wave at that time, determines the modulation scheme. Here, when the frequency band has been allocated to the mobile station B300 ₂ is switched to the mobile station C300 _4, the amount of interference increases. Although the mobile station A 300 ₁ determines the MCS assuming the interference signal of the mobile station B 300 ₂ , the amount of interference from an adjacent sector increases due to the frequency band assignment suddenly switching to the mobile station C 300 _3. The receiving station cannot receive signals with the modulation method determined in (1).

  In order to avoid such a situation, the bandwidth once allocated is not changed unless the reception state exceeds a certain amount of change. When the reception state exceeds a certain amount of change, for example, when the fluctuation range exceeds a certain threshold value, the band is released and reassignment is performed based on the propagation path state of each mobile station.

  The transmission power determination unit 412 specifies uplink transmission power for the mobile station to which the frequency band is assigned. In this case, uplink transmission power is designated to the mobile station (transmitter) to which the frequency band is allocated based on the allocated frequency bandwidth. For example, the maximum amount of power that can be transmitted by the mobile station (transmitter) is determined. For example, as shown in FIG. 27A, the case where the transmission power for a certain allocated band is X will be described. When the allocated bandwidth is widened, for example, doubled, the transmission power is halved as shown in FIG. 27B to X / 2. Thus, the transmission power is determined according to the allocated bandwidth. The transmission power determination unit 412 transmits the scheduling result and information indicating the transmission power to the transmitter. These pieces of information are input to the radio resource allocation control unit 122.

  For example, when the peak of the transmission power for a certain allocated band is X, when the allocated band is widened, for example, doubled, the peak of the transmission power is X / 2.

  The transmission power determination unit 412 transmits the scheduling result and information indicating the transmission power to the transmitter. These pieces of information are input to the radio resource allocation control unit 122. As a result, the mobile station performs uplink signal transmission with the maximum transmission power in the allocated frequency band.

  In this way, the desired signal power can be increased by concentrating the power in a certain band for transmission. In particular, for mobile stations located far from the base station (receiving device), by concentrating the power in a certain band and transmitting, the base station can receive with high power, improving the reception quality Can do.

  Also, the transmission power determination unit 412 measures the interference power in the band to be allocated, and uses the interference power to specify the transmission power so that a desired desired signal power to interference power ratio becomes a desired value. You may make it do.

  In this case, the transmission power for obtaining a desired desired signal power to interference power ratio may be greater than or equal to the transmission power that can be output by the mobile station. In this case, the transmission power that can be output from the mobile station is designated. On the other hand, when the transmission power for obtaining the desired desired signal power to interference power ratio is equal to or lower than the transmission power that can be output from the mobile station, the transmission power for obtaining the desired desired signal power to interference power ratio is designated.

  In this way, transmission power can be controlled based on the reception quality at the base station side.

  Also, the mobile station performs uplink signal transmission with the maximum transmission power in the allocated frequency band. By doing so, since the base station can receive with high power, the reception quality can be improved.

  In addition, the mobile station may perform uplink signal transmission at a constant transmission power density regardless of the allocated frequency bandwidth. For example, as shown in FIG. 28A and FIG. 28B, the radio resource allocation control unit 122 can also determine whether the bandwidth narrower than the predetermined frequency band is allocated based on the transmission power in the predetermined frequency bandwidth. Transmit with transmission power. Thus, by transmitting with constant power per band, the influence of interference on other cells (sectors) can be reduced.

  Further, switching may be performed according to the position where the mobile station exists. That is, determine whether to perform uplink signal transmission with the maximum transmission power in the allocated frequency band or whether to perform uplink signal transmission with a constant transmission power density regardless of the allocated frequency bandwidth. The transmission power may be determined by the determined method, and information indicating the determined transmission power may be notified.

  The base station may designate a modulation method and an error correction coding rate in uplink signal transmission to the mobile station to which the frequency band is assigned.

  Also, the modulation method and error correction coding rate in uplink signal transmission may be determined by the MCS determination section 414 of the base station based on the ratio of desired wave power and interference power. Here, for the desired wave power and the interference power, either an instantaneous value or an average value is used. For example, when a transmitting device that has assigned a frequency band transmits a signal based on the designated transmission power and the received power of a channel state measurement signal, the transmitting device that is estimated in the assigned frequency band has transmitted One of the instantaneous value and the average value is used based on the received power and interference power in the signal receiving apparatus, and the modulation method and error correction coding rate are determined based on the ratio of the received power and the interference power. The

  For example, a case where the mobile station performs uplink signal transmission with the maximum transmission power in the allocated frequency band will be described. In the uplink, the fluctuation of interference power is large. When the modulation scheme is determined based on the instantaneous received power, the level of interference power varies depending on the time until transmission. Therefore, when such signal transmission is performed, average values are used for received power, desired wave power, and interference power.

  On the other hand, a case will be described in which the mobile station performs uplink signal transmission at a constant transmission power density regardless of the allocated frequency bandwidth. As described above, when control is performed so that fluctuations in interference power are small, instantaneous values are used for received power, desired wave power, and interference power.

  In addition, when the MCS determination unit 414 designates MCS when a mobile station that has permitted transmission transmits a data channel, as shown in FIG. When the received SINR is measured, the MCS may be designated based on the reception quality of the pilot signal measured for each frequency band allocation unit in the allocated band. For example, using the received SINR measured for each allocation unit, the MCS is specified based on any one of the average SINR, the highest SINR, and the lowest SINR.

  Further, a receiver that performs allocation so as to change the bandwidth based on the propagation path state may be configured as shown in FIG.

  The receiver 400 has the same configuration as the receiver described with reference to FIG. 21, and includes the pilot signal specifying unit 416 connected to the receiver described with reference to FIG. 22 and the reception characteristic measuring unit 406. It differs in the point to prepare.

  The pilot signal designating unit 416 is at least one information among information indicating the desired (maximum) transmission frequency bandwidth of the data channel transmitted from the mobile station, information indicating the amount of data to be transmitted, and information indicating the data rate. Receive. Pilot signal designating section 416 receives information indicating the desired (maximum) transmission bandwidth of the pilot signal from the mobile station. Pilot signal designating section 416 designates the transmission bandwidth of the pilot signal for the mobile station. For example, the pilot signal designating unit 416 determines the pilot signal transmission bandwidth and the center frequency based on information indicating the desired (maximum) transmission bandwidth of the pilot signal for each mobile station, and determines the determined pilot. Information indicating the transmission bandwidth and center frequency of the signal is transmitted to each corresponding mobile station. Further, the pilot signal designating unit 416 may notify each corresponding transmission device of information indicating the determined transmission bandwidth and center frequency of the pilot signal by transmitting the ID of the frequency block. In this case, the pilot signal designating unit 416 may designate a plurality of frequency blocks.

  For example, as shown in FIG. 31, the pilot signal designating unit 416 allows the mobile station to transmit a pilot signal with a desired maximum bandwidth (desired (maximum) transmission bandwidth) due to a large distance from the base station. If it is determined that the reception quality of the pilot signal is insufficient when transmitted, the bandwidth of the pilot signal narrower than the maximum bandwidth desired by the mobile station is designated. For example, the pilot signal designating unit 416 designates the pilot signal transmission bandwidth based on the maximum transmission power of each mobile station and the path loss between each mobile station and the base station.

  Further, when designating the transmission bandwidth and center frequency of the pilot signal of each mobile station, the pilot signal designating unit 416, as shown in FIG. 32, the pilot of each mobile station observed in the base station in the frequency domain. Specifies that the received power of the signal is not biased or reduced. For example, the pilot signal designating unit 416 determines in advance a reference value indicating the deviation of the received power of the pilot signal of each mobile station, and transmits the pilot signal transmission band to each mobile station so as to be equal to or less than this reference value. Determine width and center frequency. In this case, pilot signal designating section 416 obtains the total received power of the pilot signal of each mobile station in the base station based on the transmission band of the pilot signal of each mobile station and the received power at the base station, and transmits and receives The transmission bandwidth and center frequency of each mobile station pilot signal are specified so that the power is less biased in the frequency domain.

  In addition, for example, when the pilot signal is transmitted to the mobile station by the IFDMA method, the pilot signal designating unit 416 performs the operation so that each frequency component is used without excess or deficiency, as shown in FIG. 33A. Determine the frequency band and repetition factor of the pilot signal of the station. That is, the frequency shift amount is determined and transmitted by the frequency division multiplexing method. In this case, a frequency offset is given so that there is no band where the same user overlaps. For example, the pilot signal designating unit 416 designates the center frequency and transmission bandwidth of the pilot signal transmitted by each mobile station based on the remaining number of repetition coefficients. In this case, pilot signal designating section 416 designates and notifies the center frequency, frequency bandwidth and repetition factor of the pilot signal.

Pilot signal designating section 416 assigns a transmission band for the propagation path measurement signal so that the number of mobile stations transmitting the propagation path measurement signal is not biased in each frequency band. For example, the pilot signal designating unit 416 allocates a transmission band for a propagation path measurement signal from a mobile station having a wide transmission band. In this case, for example, the transmission bandwidth is ²ⁿ , which is the minimum transmission bandwidth.

For example, a case will be described in which the number of mobile stations having transmission bandwidths of 5 MHz, 2.5 MHz, and 1.25 MHz in a system bandwidth of 10 MHz is N ₅ , N _2.5 , and N _1.25 . In this case, the minimum transmission bandwidth, for example, the frequency block bandwidth is 1.25 MHz.
(1) A random number is given to each of the variables Φ _{5 MHz} , Φ _{2.5 MHz} , and Φ _{1.25 MHz} . Here, the given random number is an integer.
(2) For the _fifth mobile station of n _5th transmission bandwidth 5 MHz, the frequency block ID, (Φ _{5 MHz} + n ₅ ) mod (10/5) × (10/5) to 5 / 1.25 = 4 blocks assign.
(3) n For the _25th mobile station with a transmission bandwidth of 2.5 MHz, the frequency block ID, (Φ _{5 MHz} + N ₅ + n _2.5 ) mod (10/5) × (10/5) + (Φ _{2 Assign} 2.5 / 1.25 = 2 blocks from _{.5 MHz} + n _2.5 ) mod (5 / 2.5) × (5 / 2.5).
(4) n For a _25th mobile station with a transmission bandwidth of 2.5 MHz, a frequency block ID, (Φ _{5 MHz} + N ₅ + N _2.5 + n _1.25 ) mod (10/5) × (10/5) + (Φ _{2.5 MHz} + N _2.5 + n _1.25 ) mod (5 / 2.5) × (5 / 2.5) + (Φ _{1.25 MHz} + N _2.5 + n _1.25 ) mod (2. 5 / 1.25) × (2.5 / 1.25 to 1.25 / 1.25 = 1 block is allocated.

For example, when N ₅ = 3, N ₂₅ = 3, N _1.25 = 4, Φ _{5 MHz} , Φ _{2.5 MHz} , and Φ _{1.25 MHz} = 0, the band allocation in the sector is as shown in FIG. The mobile stations are assigned sequentially from the wide transmission bandwidth.

  The pilot signal designating unit 416 executes the above-described assignment at a predetermined constant cycle because the number of mobile stations in the sector and the transmission bandwidth change due to a change in path loss due to movement of the mobile station or handover.

  As shown in FIG. 34, the reception characteristic measuring unit 406, when the mobile station transmits a pilot using a desired (maximum) transmission frequency bandwidth, a desired frequency bandwidth (desired allocation bandwidth) of the data channel. ) Is a measurement unit, and the received SINR is measured.

  The frequency block allocation unit 410 assigns a frequency band to each mobile station within the range of the pilot signal transmission band based on the measured reception SINR, the pilot signal transmission band, and the information indicating the desired frequency bandwidth of the data channel. assign. In this case, the frequency block allocation unit 410 may allocate a predetermined frequency allocation unit, for example, a frequency block as a unit.

  As shown in FIG. 35, MCS determination section 414 designates MCS based on the reception quality of the pilot signal in the allocated band for the mobile station that has permitted transmission.

  Next, the operation of the transmission apparatus 100 according to the present embodiment will be described with reference to FIG.

  The base station 200 determines the radio access method used by the mobile station 300 and notifies the mobile station 300 of it.

  First, information indicating a wireless access method is received (step S1302).

  Next, the switching unit 106 determines whether or not the received information indicating the radio access scheme is a single carrier scheme (step S1304).

  When the received information indicating the radio access scheme is the single carrier scheme (step S1304: YES), the switching unit 106 switches to the single carrier scheme. That is, the switching unit 106 inputs the input spread chip sequence to the FFT unit 108.

  Next, the frequency domain signal generation unit 114 determines whether or not the transmission data is a collision type channel (step S1308).

  If the transmission data is a collision channel (step S1308: YES), the frequency domain signal generation unit 114 allocates radio resources to the collision channel according to the input radio resource allocation information. Transmission data to which radio resources are allocated is transmitted (step S1310).

  On the other hand, if the transmission data is not a collision type channel, that is, if it is a scheduling type channel (step S1308: NO), the frequency domain signal generation unit 114 wirelessly transmits to the scheduling type channel according to the input radio resource allocation information. Allocate resources. Transmission data to which radio resources are allocated is transmitted (step S1312).

  On the other hand, when the received information indicating the radio access scheme is the multicarrier scheme (step S1304: NO), the switching unit 106 switches to the multicarrier scheme. That is, the switching unit 106 inputs the input spread chip sequence to the S / P conversion unit 110 (step S1314).

  Next, the frequency domain signal generation unit 114 determines whether or not the transmission data is a collision type channel (step S1316).

  When the transmission data is a collision channel (step S1316: YES), the frequency domain signal generation unit 114 allocates radio resources to the collision channel according to the input radio resource allocation information. Transmission data to which radio resources are allocated is transmitted (step S1318).

  On the other hand, if the transmission data is not a collision type channel, that is, if it is a scheduling type channel (step S1316: NO), the frequency domain signal generation unit 114 wirelessly transmits to the scheduling type channel according to the input radio resource allocation information. Allocate resources. Transmission data to which radio resources are allocated is transmitted (step S1320).

  Next, the operation of the receiving apparatus 400 according to the present embodiment will be described with reference to FIG.

  First, the radio access method determination unit 402 determines the radio access method used by the mobile station 300.

  Next, the case where the radio access scheme determination unit 402 determines the single carrier scheme as the radio access scheme used by the mobile station 300 will be described.

  The reception characteristic measurement unit 406 measures the priority in each frequency block, for example, reception SINR, for all users (step S2602). The priority is obtained for each user by the number of frequency blocks.

  Next, the ranking unit 408 ranks the priorities of (number of users × number of frequency blocks) in descending order, and creates a ranking table by associating users with frequency blocks (step S2604).

  When each user transmits the pilot channel using the entire band, the rank of the ranking table is the number of users × the number of frequency blocks. When the frequency band in which each user transmits a pilot is different, there is no rank corresponding to a frequency block in which the user does not transmit a pilot channel. For example, when a certain user transmits a pilot channel using 5 frequency blocks among 8 frequency blocks, there is no rank corresponding to 3 frequency blocks.

  Next, the frequency block allocation unit 410 performs provisional allocation of frequency blocks corresponding to the user corresponding to the priority from the high priority (step S2606).

  The frequency block allocation unit 410 refers to the ranking table and allocates frequency blocks to corresponding users in descending order of rank. For example, according to the ranking table, the frequency block corresponding to the user A at the first rank is four. In this case, in the frequency block 4, “A1” indicating that the rank of the user A is first is described. Similarly, in the frequency block 5, “A2” indicating that the rank of the user A is second is described. Thereafter, frequency blocks are temporarily allocated in the same manner.

  Next, the frequency block allocation unit 410 allocates adjacent frequency blocks among the frequency blocks temporarily allocated to the user corresponding to the maximum priority (step S2608).

  In the case of allocating a band, for user A, frequency blocks 3 to 5 and 8 are temporarily allocated. However, since it is a single carrier system, a band including the highest frequency block is allocated. Therefore, frequency blocks 3 to 5 are assigned to user A.

  Next, the frequency block allocation unit 410 determines whether all frequency blocks have been allocated or all users have been allocated (step S2610).

  If all frequency blocks have been allocated or all users have been allocated (step S2610: YES), transmission power and MCS are determined for each user to which the frequency block is allocated (step S2614).

  On the other hand, if all frequency blocks have been allocated or all users have not been allocated (step S2610: NO), the frequency block allocating unit 410 ranks the priorities again in order of higher priority, excluding the priority of the allocated users. Perform (step S2612), and return to step S2606.

  In this case, since the user A is assigned to the frequency blocks 3 to 5, the same processing as described above is performed except for the frequency blocks 3 to 5.

  In this way, a band with a good propagation path state is allocated for each user. A continuous band can be assigned to the same user so as not to have a discrete band.

  Next, the operation of another receiving apparatus 400 according to the present embodiment will be described with reference to FIG. Here, the operation of receiving apparatus 400 described with reference to FIG. 30 will be described. As described above, the base station includes the receiving device 400, and the mobile station includes the transmitting device 100.

  First, the radio access method determination unit 402 determines the radio access method used by the mobile station 300.

  Here, a case will be described in which radio access scheme determining section 402 determines a single carrier scheme as the radio access scheme used by mobile station 300.

  The pilot channel generation unit bases at least one information on information indicating a desired (maximum) transmission frequency bandwidth of the data channel with respect to the base station, information indicating the amount of data to be transmitted, and information indicating the data rate. Send to the station. Also, the pilot channel generation unit notifies information indicating a desired maximum transmission bandwidth of the pilot signal (step S3802).

  The pilot signal designating unit 416 determines the center frequency and frequency bandwidth of the pilot signal transmitted by the mobile station based on the information indicating the desired maximum transmission bandwidth of the pilot signal (step S3804), and the determined pilot signal The mobile station is notified of information indicating the center frequency and frequency bandwidth of the mobile station (step S3806). Further, the pilot signal designating unit 416 may notify each corresponding transmission device of information indicating the determined transmission bandwidth and center frequency of the pilot signal by transmitting the ID of the frequency block. In this case, the pilot signal designating unit 416 may designate a plurality of frequency blocks. For example, the pilot channel specifying unit 416 specifies the transmission bandwidth based on the maximum transmission power of each mobile station and the path loss between each mobile station and the base station.

  The pilot channel generation unit transmits a pilot signal according to the notified information indicating the center frequency and frequency bandwidth (step S3808). In this case, the pilot signal generation unit may transmit the pilot signal by a frequency hopping method.

  Next, reception characteristic measurement section 406 measures the reception SINR of the pilot signal. Further, the frequency block allocation unit 410 determines a mobile station to allocate a frequency band based on the received SINR of the pilot signal. Further, the MCS determination unit 414 determines an MCS for a mobile station that allocates a frequency band and permits transmission (step S3810). Here, the transmission power determination unit 412 may determine transmission power for a mobile station that allocates a frequency band and permits transmission.

  Next, the radio resource allocation unit 404 notifies the mobile station that permits transmission of information indicating the data channel allocation band (chunk, frequency block) and the MCS to be used (step S3812).

  Information indicating the allocated bandwidth of the data channel transmitted from the base station is input to the radio resource allocation control unit 122, and MCS information is input to the spreading and channel code unit 102.

  The spreading and channel code unit 102 applies channel correction by applying an error correction code such as a turbo code or a convolutional code to the input binary information sequence in accordance with the input MCS information, and is channel encoded. Data is modulated.

  The frequency domain signal generation unit 114 determines the data size according to the allocated bandwidth. Information indicating the user ID, MCS, new / retransmission category, and data size is multiplexed on the control channel. As a result, a transmission frame is generated (step S3814).

  Next, the mobile station transmits a data channel (step S3816).

  The data channel transmitted from the mobile station is demodulated and decoded by the base station (step S3818).

  The base station transmits ACK / NACK based on the data channel demodulation / decoding result.

  The following items are further disclosed regarding the embodiment including the above examples.

(1) A transmission apparatus that can be used in a single carrier communication system and a multicarrier communication system:
Switching means for switching the wireless access method;
Frequency domain signal generating means for allocating radio resources and generating frequency domain signals to the spread chip sequence that has been subjected to either fast Fourier transform or serial-parallel conversion in accordance with the switched radio access scheme;
A transmission signal generating means for performing a fast inverse Fourier transform on the frequency domain signal to generate a transmission signal;
A transmission device comprising:

  With this configuration, a single-carrier wireless access method and a multi-carrier wireless access method can be realized by a common module, and a single-carrier wireless access method and a multi-carrier wireless method can be realized. Communication can be performed with the access method.

(2) In the transmission device according to (1):
The transmission device according to claim 1, wherein the switching means switches the wireless access method in accordance with the notified information indicating the wireless access method.

(3) In the transmission device according to (1) or (2):
The switching means transmits a channel state measurement signal using a predetermined frequency band desired to be allocated when switching to a single carrier radio access scheme.

(4) In the transmission device according to (1) or (2):
Pilot signal generating means for notifying information indicating at least one of a desired frequency bandwidth, transmission data amount, and data rate of a data channel when switching to a single-carrier wireless access method;
A transmission device comprising:

(5) In the transmission device according to (4):
The pilot signal generating means notifies information indicating a desired maximum transmission bandwidth of a pilot signal.

(6) In the transmission device according to (5):
The transmission apparatus according to claim 1, wherein the pilot signal generation means transmits a pilot signal in accordance with a center frequency and a frequency bandwidth designated based on information indicating a desired maximum transmission bandwidth of the pilot signal.

(7) In the transmission device according to (6):
The transmission apparatus according to claim 1, wherein the pilot signal generating means transmits a pilot signal by a frequency hopping method.

(8) In the transmission device according to (7):
The transmission apparatus according to claim 1, wherein the pilot signal generation means transmits a pilot signal by performing frequency hopping for each designated frequency bandwidth.

(9) In the transmission device according to any one of (1) to (8):
The frequency domain signal generation means repeats a chip sequence after diffusion subjected to fast Fourier transform a predetermined number of times, shifts each chip sequence repeated a predetermined number of times, and generates a constant chip pattern. Transmitting device.

(10) In the transmission device according to any one of (1) to (9):
The transmission apparatus according to claim 1, wherein the frequency domain signal generation means allocates radio resources according to the type of physical channel.

(11) In the transmission device according to (10):
The frequency domain signal generation means, when allocating a frequency block to a physical channel, allocates radio resources in units of the transmission time interval length of the frequency block.

(12) In the transmission device according to (10) or (11):
The frequency domain signal generation means allocates radio resources so as to use at least a part of allocated frequency bands when a signal to be transmitted is a collision type channel.

(13) In the transmission device according to (10) or (11):
The frequency domain signal generation means allocates radio resources based on the notified scheduling result when a signal to be transmitted is a shared control channel.

(14) In the transmission device according to (10) or (11):
The frequency domain signal generation means allocates radio resources based on the notified scheduling result when a signal to be transmitted is a shared data channel.

(15) In the transmission device according to (14):
The transmission apparatus according to claim 1, wherein the frequency domain signal generation means allocates radio resources based on the notified scheduling result in the time domain in frequency division multiple access.

(16) In the transmission device according to (15):
The frequency domain signal generation means allocates a plurality of frequency blocks based on a data rate.

(17) In the transmission device according to (14):
The frequency domain signal generation means allocates radio resources based on the notified scheduling results in the time domain and frequency domain.

(18) In the transmission device according to (17):
The transmission apparatus according to claim 1, wherein the frequency domain signal generation means assigns the frequency blocks in groups.

(19) In the transmission device according to any one of (14) to (18):
The frequency domain signal generation means changes the allocated bandwidth according to the data rate when single carrier transmission is performed.

(20) Wireless access method determining means for determining a wireless access method used by the transmission device;
Notification means for notifying information indicating the determined wireless access method;
A receiving apparatus comprising:

  With this configuration, it is possible to determine and notify the radio access scheme used by the transmission apparatus.

(21) In the receiving device according to (20):
The wireless access method determination means determines a wireless access method based on an environment in which the own reception device is installed.

(22) In the receiving device according to (20):
The radio access scheme determining means determines a radio access scheme based on a cell configuration.

(23) In the receiving device according to (20):
The receiving apparatus according to claim 1, wherein the wireless access method determining means determines a wireless access method for each transmitting device.

(24) In the receiving device according to (20):
The wireless access method determining means determines a wireless access method based on the distance between the receiving device and the transmitting device.

(25) In the receiving device according to (20):
The radio access scheme determining means determines a radio access scheme based on transmission power in the transmitter.

(26) In the receiving device according to any one of (20) to (25):
Radio resource allocation determining means for determining a frequency band to be allocated based on the frequency band to which the channel state measurement signal is transmitted;
Have
The receiving unit transmits information indicating the determined frequency band.

(27) In the receiver according to (26):
The radio resource allocation determining unit allocates a frequency band within a frequency band in which a channel state measurement signal is transmitted.

(28) In the receiving device according to (27):
The radio resource allocation determining means is based on at least one of reception power of a propagation path state measurement signal in the reception device, type of data to be transmitted by the transmission device, transmission waiting time, and maximum transmission power of each mobile station. And determining a transmitting device to which a frequency is assigned for each predetermined frequency allocation unit.

(29) In the receiving device according to (26):
The reception apparatus characterized in that, when the radio access scheme of the single carrier scheme is determined, the radio resource allocation determining means allocates continuous frequency bands to the same transmission apparatus based on reception characteristics for each transmission apparatus. .

(30) In the receiver according to any one of (20) to (25):
Based on the information indicating the desired maximum transmission bandwidth of the pilot signal, the transmission bandwidth and center frequency of the pilot signal are determined for each transmission device, and the information indicating the determined transmission bandwidth and center frequency of the pilot signal is associated Pilot signal designating means for transmitting to each transmitting device;
A receiving apparatus comprising:

(31) In the receiving device according to (30):
The said pilot signal designation | designated means notifies the information which shows the transmission bandwidth and center frequency of the determined pilot signal to each corresponding transmitter by transmitting ID of a frequency block.

(32) In the receiving device according to (30) or (31):
The pilot signal designating unit determines a transmission bandwidth based on a maximum transmission power of each transmission device and a path loss between each transmission device and the reception device.

(33) In the receiver according to (32):
The receiving apparatus according to claim 1, wherein the pilot signal designating unit determines a transmission bandwidth to one of an integral multiple and 2 ⁿ times a minimum transmission bandwidth determined by the system.

(34) In the receiving device according to (33):
The pilot signal designating unit determines a transmission bandwidth to a maximum bandwidth where a reception SINR predicted when a transmission apparatus transmits the pilot signal with a maximum transmission power is equal to or greater than a required reception SINR. A receiving device.

(35) In the receiving device according to (33):
The pilot signal designating unit determines the transmission bandwidth as the minimum transmission bandwidth when the reception SINR predicted when the transmission apparatus transmits the pilot signal with the minimum transmission bandwidth is less than the required reception SINR. A receiving apparatus.

(36) In the receiving device according to (34) or (35):
The receiving apparatus characterized in that the pilot signal designating means calculates the predicted received SINR using an average path loss between the receiving apparatus and the transmitting apparatus and an average interference power in the receiving apparatus.

(37) In the receiving device according to any one of (30) to (36):
The pilot signal designating unit determines a transmission bandwidth and a center frequency of a pilot signal based on total uplink reception power.

(38) In the receiving device according to (37):
The pilot signal designating means predetermines a reference value indicating a deviation in received power of a pilot signal of each transmission device, and transmits the pilot signal transmission bandwidth and A receiving apparatus for determining a center frequency.

(39) In the receiving device according to (37):
The receiving apparatus characterized in that the pilot signal designating means allocates a transmission band of the pilot signal so that a deviation in the number of transmitting apparatuses that transmit the pilot signal is reduced in each frequency band.

(40) In the receiver according to any one of (30) to (36):
The pilot signal designating unit determines a transmission bandwidth and a center frequency of a pilot signal for each transmission device based on the remaining number of repetition coefficients.

(41) In the receiver according to any one of (30) to (40):
Receiving characteristic measuring means for measuring the receiving characteristic of the pilot signal;
Radio resource allocation determining means for allocating a frequency band to each transmission device within a range of the transmission band of the pilot signal based on information indicating the reception characteristics, a transmission band of the pilot signal, and a desired frequency bandwidth of the data channel;
A receiving apparatus comprising:

(42) In the receiver according to (41):
The radio resource allocation determining means allocates a frequency band to each transmitter based on a predetermined frequency allocation unit.

(43) In the receiving device according to (41) or (42):
The radio resource allocation measuring means uses a reception characteristic measured in the past as a reception characteristic of a band in which no pilot is transmitted.

(44) In the receiving device according to any one of (41) to (43):
The reception apparatus is characterized in that the reception characteristic measuring means measures reception characteristics of a transmitted pilot signal using a predetermined frequency band allocation unit as a measurement unit.

(45) In the receiving device according to (41) to (43):
The receiving apparatus is characterized in that the receiving characteristic measuring means measures a receiving characteristic of a transmitted pilot signal using a desired allocation band of a data channel as a measurement unit.

(46) In the receiver according to any one of (26) to (45):
The radio resource allocation determining unit specifies uplink transmission power based on an allocated frequency bandwidth.

(47) In the receiving device according to any one of (26) to (45):
The radio resource allocation determining means designates transmission power based on interference power in a band to be allocated so that a desired signal power to interference power ratio becomes a desired value.

(48) In the receiving device according to any one of (26) to (45):
The radio resource allocation determining means sets at least one of required quality for a data channel and required quality for a channel state measurement signal.

(49) In the receiving device according to (48):
The radio resource allocation determining means notifies at least one of required quality for the data channel and required quality for the channel state measurement signal through a broadcast channel.

(50) In the receiving device according to (48) or (49):
The radio | wireless resource allocation determination means performs transmission power control based on the required quality with respect to the said signal for a carrier state measurement, when there is no data channel allocation.

(51) In the receiving device according to (48) or (49):
When there is a data channel allocation, the radio resource allocation determining means is configured to transmit a transmission power based on a required quality for the data channel with respect to a data unit and a channel state measurement signal unit time-multiplexed in a transmission frame. A receiving apparatus that performs control.

(52) In the receiving device according to any one of (26) or (45):
The receiving apparatus according to claim 1, wherein the radio resource allocation determining means designates transmission power so as to have a constant transmission power density.

(53) In the receiver according to any one of (46) to (52):
The radio resource allocation determining means is estimated in the allocated frequency band when the transmitting apparatus that has allocated the frequency band transmits a signal based on the specified transmission power and the received power of the propagation path state measurement signal. , Determining to use any one of the instantaneous value and the average value of the received power and interference power at the receiving device of the signal transmitted by the transmitting device, and based on the ratio of the determined received power and interference power, A receiving apparatus for determining a modulation method and an error correction coding rate.

(54) In the receiver according to (53):
The radio resource allocation determining means determines an MCS based on a reception quality of a pilot signal measured for each allocation unit of a frequency band, and notifies the transmitter of the MCS.

(55) In the receiver according to (53):
The radio resource allocation determining unit determines an MCS based on reception quality of a pilot signal in an allocated band, and notifies the transmitter of the MCS.

(56) In the receiver according to any one of (46) to (52):
The radio resource allocation determining means performs the same transmission until the received power of the channel state measurement signal of the allocated transmission apparatus in the frequency band that has been allocated has changed beyond a predetermined threshold. A receiving apparatus characterized by continuously assigning the frequency band to a station in time.

(57) A mobile communication system including a transmission device and a reception device that can be used in a single-carrier communication system and a multi-carrier communication system:
Wireless access method determining means for determining a wireless access method used by the transmitting apparatus;
Notification means for notifying information indicating the determined wireless access method;
Switching means for switching the wireless access method;
Frequency domain signal generating means for allocating radio resources and generating frequency domain signals to the spread chip sequence that has been subjected to either fast Fourier transform or serial-parallel conversion in accordance with the switched radio access scheme;
A transmission signal generating means for performing a fast inverse Fourier transform on the frequency domain signal to generate a transmission signal;
A mobile communication system comprising:

  With this configuration, a single-carrier wireless access scheme and a multi-carrier wireless access scheme can be realized by a common module. According to the determined wireless access scheme, a single-carrier wireless access scheme can be realized. Communication can be performed by an access method and a multi-carrier wireless access method.

(58) A step in which the receiving device determines a radio access method to be used;
The receiving device notifying information indicating the determined radio access scheme;
A transmitting device receiving information indicating a wireless access method;
A step in which the transmitting device switches the radio access scheme according to the information indicating the radio access scheme;
A step in which a transmitting device allocates radio resources to a spread chip sequence that has been subjected to either fast Fourier transform or serial-parallel conversion in accordance with the switched radio access scheme, and generates a frequency domain signal;
A transmission device performing fast inverse Fourier transform on the frequency domain signal to generate a transmission signal;
A transmission control method comprising:

  With this configuration, communication can be performed using a single-carrier wireless access method and a multi-carrier wireless access method according to the determined wireless access method.

(59) In the transmission control method according to (58):
A step of notifying a receiving device of information indicating at least one of a desired frequency bandwidth, a transmission data amount, and a data rate of a data channel when switching to a single-carrier wireless access method;
A transmission control method comprising:

(60) In the transmission control method according to (59):
The transmitter notifying information indicating a desired maximum transmission bandwidth of the pilot signal;
A transmission control method comprising:

(61) In the transmission control method according to (59):
Transmitting a pilot signal according to a center frequency and a frequency bandwidth designated based on information indicating a desired maximum transmission bandwidth of the pilot signal;
A transmission control method comprising:

(62) In the transmission device according to (61):
The step of transmitting the pilot signal includes transmitting the pilot signal by a frequency hopping method.

(63) In the transmission control method according to any one of (58) to (62):
Generating the frequency domain signal comprises:
Repeating the chip sequence after diffusion subjected to the fast Fourier transform a predetermined number of times;
Shifting each chip series repeated a predetermined number of times to generate a constant chip pattern;
A transmission control method comprising:

(64) In the transmission control method according to any one of (58) to (63):
Generating the frequency domain signal assigning radio resources according to a physical channel type;
A transmission control method comprising:

(65) In the transmission control method according to (64):
The method of allocating radio resources includes the step of allocating radio resources in units of transmission time interval lengths of frequency blocks when allocating frequency blocks to physical channels.

(66) In the transmission control method according to (64) or (65):
The step of allocating radio resources includes the step of allocating radio resources based on the notified scheduling result when a signal to be transmitted is a shared data channel.

(67) In the transmission control method according to (66):
The transmission control method characterized in that the step of allocating radio resources includes a step of allocating radio resources based on the notified scheduling result in the time domain in frequency division multiple access.

(68) In the transmission control method according to (67):
The radio resource allocation step includes a step of allocating a plurality of frequency blocks based on a data rate.

(69) In the transmission control method according to (64):
The step of allocating radio resources includes the step of allocating radio resources based on the notified result of scheduling in the time domain and frequency domain.

(70) In the transmission control method according to (64):
The step of allocating radio resources includes the step of allocating frequency blocks in groups.

(71) In the transmission control method according to any one of (66) to (70):
The step of allocating the radio resource includes a step of changing an allocated bandwidth according to a data rate when single carrier transmission is performed.

(72) In the communication control method according to (64):
The step of allocating the radio resource includes a step of allocating a frequency band within a range of a frequency band transmitting a propagation path state measurement signal.

(73) In the transmission control method according to (72):
The step of allocating the radio resource is based on at least one of reception power of a propagation path state measurement signal in a receiving device, type of data to be transmitted by a mobile station, transmission waiting time, and maximum transmission power of each mobile station. Determining a mobile station to allocate a frequency for each frequency allocation unit;
A transmission control method comprising:

(74) In the transmission control method according to (72) or (73):
Allocating the radio resources when determined to be a single carrier radio access scheme, allocating consecutive frequency bands to the same mobile station based on reception characteristics for each mobile station;
A transmission control method comprising:

(75) In the transmission control method according to (58) or (59):
A step in which the receiving device designates the transmission bandwidth and center frequency of the pilot signal for each transmitting device based on information indicating the desired maximum transmission bandwidth of the pilot signal;
A step in which the receiving device transmits information indicating the transmission bandwidth and center frequency of the determined pilot signal to each corresponding transmitting device;
A transmission control method comprising:

(76) In the transmission control method according to (75):
The transmission step includes transmitting the frequency block ID to notify each corresponding transmission apparatus of information indicating the determined transmission bandwidth and center frequency of the pilot signal.

(77) In the receiving device according to (75) or (76):
The step of designating the transmission bandwidth and the center frequency determines a transmission bandwidth based on a maximum transmission power of each transmission device and a path loss between each transmission device and a reception device. Control method.

(78) In the transmission control method according to (77):
The step of designating the transmission bandwidth and the center frequency determines the transmission bandwidth as one of an integral multiple of a minimum transmission bandwidth determined by the system and 2 ⁿ times.

(79) In the transmission control method according to (78):
The step of designating the transmission bandwidth and the center frequency includes the step of setting the transmission bandwidth to a maximum bandwidth where a reception SINR predicted when a transmission apparatus transmits the pilot signal with a maximum transmission power is equal to or greater than a required reception SINR Determining a transmission control method.

(80) In the transmission control method according to (78):
The step of specifying the transmission bandwidth and the center frequency includes the step of specifying a minimum transmission bandwidth when a reception SINR predicted when a transmission apparatus transmits the pilot signal with a minimum transmission bandwidth is less than a required reception SINR. A transmission control method characterized by determining a transmission bandwidth.

(81) In the transmission control method according to (79) or (80):
The step of designating the transmission bandwidth and the center frequency calculates the predicted reception SINR by using an average path loss between the reception device and the transmission device and an average interference power at the reception device. apparatus.

(82) In the transmission control method according to any one of (75) to (77):
The step of designating the transmission bandwidth and center frequency determines the transmission bandwidth and center frequency of a pilot signal based on the total received power of uplink.

(83) In the transmission control method according to any one of (75) to (77):
The step of designating the transmission bandwidth and the center frequency determines a transmission bandwidth and a center frequency of a pilot signal for each transmission device based on the remaining number of repetition coefficients.

(84) In the transmission control method according to any one of (75) to (83):
A receiving device measuring reception characteristics of a pilot signal;
A step in which the receiving device assigns a frequency band to each transmitting device within the range of the transmission band of the pilot signal based on information indicating the reception characteristics, a transmission band of the pilot signal, and a desired frequency bandwidth of the data channel;
A transmission control method comprising:

(85) In the transmission control method according to (84):
The step of allocating the frequency band assigns a frequency band to each transmission device based on a predetermined frequency allocation unit.

(86) In the transmission control method according to (84) or (85):
The step of assigning the frequency band uses a reception characteristic measured in the past as a reception characteristic of a band in which no pilot is transmitted.

(87) In the transmission control method according to any one of (84) to (86):
The step of measuring the reception characteristic of the pilot signal comprises measuring the reception characteristic of the pilot signal using a predetermined frequency band allocation unit as a measurement unit.

(88) In the transmission control method according to (84) to (86):
The step of measuring the reception characteristic of the pilot signal comprises measuring the reception characteristic of the transmitted pilot signal using the desired allocated band of the data channel as a measurement unit.

(89) In the transmission control method according to (65):
Designating uplink transmit power based on the allocated frequency bandwidth;
A transmission control method comprising:

(90) In the transmission control method according to (89):
The step of designating the transmission power includes the step of designating the transmission power based on the interference power in the band to be allocated so that the desired signal power to interference power ratio becomes a desired value;
A transmission control method comprising:

(91) In the transmission control method according to (65):
The step of determining the transmission power sets at least one of required quality for a data channel and required quality for a channel state measurement signal.

(92) In the transmission control method according to (91):
The step of determining the transmission power includes notifying at least one of required quality for the data channel and required quality for the propagation path state measurement signal through a broadcast channel.

(93) In the transmission control method according to (91) or (92):
The step of determining the transmission power includes performing transmission power control based on required quality for the signal for carrying state measurement when no data channel is allocated.

(94) In the transmission control method according to (91) or (92):
When there is a data channel assignment, the step of determining the transmission power is performed based on the required quality for the data channel with respect to the data portion and the channel state measurement signal portion that are time-multiplexed in the transmission frame. A transmission control method characterized by performing power control.

(95) In the transmission control method according to (89):
The step of designating the transmission power includes the step of designating the transmission power so as to have a constant transmission power density;
A transmission control method comprising:

(96) In the transmission control method according to any one of (89) to (95):
Based on the specified transmission power and the received power of the propagation path state measurement signal, when the transmission device to which the frequency band is assigned transmits a signal, the signal transmitted from the transmission device is estimated in the assigned frequency band. Determining to use any one of an instantaneous value and an average value of received power and interference power at the receiving device;
Determining a modulation method and an error correction coding rate based on a ratio between the determined desired transmission power and interference power;
A transmission control method comprising:

(97) In the transmission control method according to (96):
The step of determining the modulation method and the error correction coding rate determines an MCS based on the reception quality of a pilot signal measured for each frequency band allocation unit.

(98) In the transmission control method according to (96):
The transmission control method characterized in that the step of determining the modulation method and the error correction coding rate determines MCS based on reception quality of a pilot signal in an allocated band.

(99) In the transmission control method according to (65):
The step of allocating the radio resource is the same until the received power of the channel state measurement signal of the allocated transmission apparatus in the frequency band that has been allocated changes beyond a predetermined threshold. Continuously assigning the frequency band to the transmitting station in time;
A transmission control method comprising:

  The transmission device, the reception device, the mobile communication system, and the transmission control method according to the present invention can be applied to a mobile communication system that performs packet transmission.

1 spreading section 2 code multiplication section 3 phase unit 30,40,100 transmitting apparatus 200, 200 _{1, 200 2,} 200 _3, 200 _4, 200 5, 200 ₆ base station 300 the mobile station 400 receiving device

Claims (1)

A transmission apparatus that can be used in a single-carrier communication system and a multi-carrier communication system:
Switching means for switching the wireless access method;
Frequency domain signal generating means for allocating radio resources and generating frequency domain signals to the spread chip sequence that has been subjected to either fast Fourier transform or serial-parallel conversion in accordance with the switched radio access scheme;
Transmission signal generation means for performing a fast inverse Fourier transform on the frequency domain signal to generate a transmission signal;
A transmission device comprising:

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