JP2011061863A - Base station and terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless communication system that suppresses interruption of data transfer on the way of data transfer to a terminal so as to enhance throughput of a sector in a base station. <P>SOLUTION: In the wireless communication system that interconnects the base station (30) and the terminal (20) to allow the base station to make communication with a plurality of the terminals at the same time, the base station changes allocation of a communication resource to the plurality of the terminals depending on at least either of the strength of a signal that is sent from the base station and received by the terminals and a signal-to-noise ratio of the signal sent from the base station; and when transferring data to the terminals, the base station changes the allocation of the communication resource to the terminals depending on a progress of the data transfer to the terminals. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a wireless communication system, and more particularly to data transmission from a base station to a wireless communication terminal.

  A wireless communication terminal device such as a portable wireless device establishes a communication line using radio waves with a base station, and performs communication by transmitting and receiving voice, data, and the like wirelessly. In particular, in the CDMA system, data is transmitted to a plurality of terminal devices connected to the base station by a carrier-to-interference noise ratio (C / I) in order to increase the transmission efficiency of data communication from the base station to the terminal. A communication method (HDR method) has been proposed in which the data communication speed to be changed is changed, communication with a terminal device having a good communication state is terminated quickly, and transmission efficiency is improved as a whole.

  FIG. 5 is a communication procedure diagram in a conventional wireless communication system. In this figure, a base station (BS) communicates with four terminal devices (MS1 to MS4).

  At the beginning of each frame, the base station transmits a pilot signal (a signal with a specific pattern) to each terminal device at once. Each terminal device transmits C / I to the base station based on the received signal strength received from the pilot signal transmitted from the base station.

  On the other hand, the base station determines a communication allocation time for each terminal apparatus in the next frame, and transmits a control signal (assign signal, Assign) following the pilot signal of the next frame. The base station designates the time information of the timing to be received for each terminal device by using this assignment signal, and broadcasts it simultaneously to each terminal device. Each terminal apparatus receives a signal from the base station at the time allocated by the assignment signal.

  However, in mobile communication, when a terminal moves to a place where the radio wave environment is poor, the radio wave is cut off and communication is interrupted. If the radio wave is interrupted during data transfer, the file being transmitted must be retransmitted from the beginning, occupying a lot of communication time at the base station, and transmission efficiency deteriorates. In particular, if communication is interrupted after the file transfer has progressed to some extent (for example, 90%), the data transmitted up to that point is wasted, and the transmission efficiency (throughput) in the sector of the base station as a whole deteriorates. there were.

  In addition, since data is frequently retransmitted to a terminal in a place with a poor radio wave environment, allocating the same communication resources as normal and transmitting data at the normal communication speed will cause data delays and omissions. Arise. This is a cause of sound omission, noise, and image disturbance due to missing data, particularly when transmitting continuous data (for example, music data, image data).

  An object of the present invention is to provide a wireless communication system that suppresses interruption of data transfer in the middle of data transfer to a terminal and improves throughput in a sector of the base station.

  According to a first aspect of the present invention, there is provided a wireless communication system in which a base station is connected to a terminal, and the base station communicates with a plurality of terminals simultaneously. The base station transmits a signal transmitted from the base station. The allocation of communication resources to the plurality of terminals is changed according to at least one of the strength received by the terminal and a signal-to-noise ratio of a signal transmitted from the base station. When data is transferred to a terminal, the allocation of communication resources to the terminal is changed according to the progress of data transfer to the terminal.

  In a second aspect based on the first aspect, the terminal transmits the progress status of data transfer transmitted from the base station to the base station, and the base station is transmitted from the terminal. The allocation of communication resources to the terminal is changed according to the progress of data transfer.

  According to a third invention, in the first or second invention, when data transfer to the terminal proceeds, the allocation of communication resources to the terminal is increased.

  According to a fourth aspect of the present invention, in the wireless communication system in which a base station and a terminal are connected and the base station communicates with a plurality of terminals simultaneously, the base station transmits a signal transmitted from the base station. The allocation of communication resources to the plurality of terminals is changed according to at least one of the strength received by the terminal and a signal-to-noise ratio of a signal transmitted from the base station. When data is transferred to a terminal, the allocation of communication resources to the terminal is changed according to the data retransmission rate to the terminal.

  In a fifth aspect based on the fourth aspect, the terminal transmits a retransmission rate of data transmitted from the base station to the base station, and the base station transmits data transmitted from the terminal. The allocation of communication resources to the terminal is changed according to the retransmission rate.

  A sixth invention is characterized in that, in the fourth or fifth invention, when the retransmission rate of data to the terminal is high, the allocation of communication resources to the terminal is increased.

  According to a seventh aspect of the present invention, in the first to sixth aspects of the invention, the change in the allocation of the communication resources includes the allocation of communication time to each terminal, the modulation scheme used for communication with each terminal, or each terminal. It is characterized in that at least one of the error correction methods used for communication with is changed.

  According to an eighth aspect of the present invention, communication resources are allocated to a plurality of terminals according to at least one of a strength at which a terminal receives a signal transmitted from a base station and a signal-to-noise ratio of a signal transmitted from the base station. In a terminal that communicates with a plurality of base stations that communicate simultaneously with the plurality of terminals while changing the terminal, the terminal changes the allocation of communication resources to the terminals in the base station, It has a means to transmit the progress of the data transfer to the terminal to the base station.

  According to a ninth aspect of the present invention, communication resources are allocated to a plurality of terminals according to at least one of a strength at which a terminal receives a signal transmitted from a base station and a signal-to-noise ratio of a signal transmitted from the base station. In a terminal that communicates with a plurality of base stations that communicate simultaneously with the plurality of terminals while changing the terminal, the terminal changes the allocation of communication resources to the terminals in the base station, It has a means to transmit the retransmission rate of the data to the terminal to the base station.

  In the first invention, the base station uses the plurality of signals according to at least one of an intensity at which the terminal receives a signal transmitted from the base station and a signal-to-noise ratio of a signal transmitted from the base station. Change the allocation of communication resources to the terminal, and the base station changes the allocation of communication resources to the terminal according to the progress of data transfer to the terminal. The interruption of the data transfer in the middle can be suppressed, and the transmission efficiency (throughput) in the sector of the base station can be improved as a whole.

  In the second invention, the terminal transmits the progress status of the data transfer transmitted from the base station to the base station, and the base station determines the progress of the data transfer transmitted from the terminal. Since the allocation of communication resources to the terminal is changed, there is no need to monitor the amount of data passed by the base station.

  In the third invention, since the allocation of communication resources to the terminal increases as the data transfer to the terminal proceeds, the communication speed for the terminal is improved and the data transfer is quickly completed. The interruption of data transfer after the data transfer to the terminal progresses can be suppressed, and as a whole, the transmission efficiency (throughput) in the sector of the base station can be improved.

  In a fourth aspect of the present invention, in a wireless communication system in which a base station and a terminal are connected and the base station communicates simultaneously with a plurality of terminals, the base station transmits a signal transmitted from the base station. While changing the allocation of communication resources for the plurality of terminals according to at least one of the strength received by the terminal and the signal-to-noise ratio of a signal transmitted from the base station, the base station Since the allocation of communication resources to the terminal is changed according to the data retransmission rate to the terminal, when transmitting continuous data such as moving images, data is lost due to data delay due to retransmission, It can suppress that property is impaired.

  In a fifth aspect of the invention, the terminal transmits a retransmission rate of data transmitted from the base station to the base station, and the base station uses the retransmission rate of data transmitted from the terminal to Since the allocation of communication resources to the terminal is changed, there is no need to monitor the amount of data retransmitted by the base station, and the processing of the base station is reduced.

  In the sixth invention, when the data retransmission rate to the terminal is high, the allocation of communication resources to the terminal is increased. Therefore, data is lost due to data delay due to retransmission, and data continuity is increased. It is possible to suppress damage.

  In the seventh invention, since the allocation of communication resources is changed by changing the allocation of communication time to each terminal, the allocation of communication resources to each mobile station can be changed by a simple method in the time division communication method. Can do. In the seventh invention, since the allocation of communication resources is changed by changing the modulation method used for communication with each terminal, the digital communication method can be simplified by changing the amount of data included in one symbol. In the method, the allocation of communication resources to each mobile device can be changed. In the seventh invention, since the allocation of communication resources is changed by changing the error correction method used for communication with each terminal, the capacity of the code used for error correction is changed. The allocation of communication resources to each mobile device can be changed by a simple method.

  In the terminal of the eighth invention, in order to change the allocation of communication resources for the terminal in the base station, the progress of data transfer to the terminal is transmitted to the base station. The interruption of data transfer during the transfer can be suppressed, and the transmission efficiency (throughput) in the sector of the base station can be improved as a whole.

  In the terminal of the ninth invention, in order to change the allocation of communication resources to the terminal in the base station, the retransmission rate of data to the terminal is transmitted to the base station. Since the communication resource allocation is changed and the communication speed is changed, when continuous data such as a moving image is transmitted, data loss caused by data delay due to retransmission can be suppressed.

It is a block diagram of the radio | wireless communications system of embodiment of this invention. It is a figure explaining the communication allocation time in the radio | wireless communications system of embodiment of this invention. It is a communication procedure figure in the radio | wireless communications system of embodiment of this invention. It is a block diagram of the mobile device 20 of the embodiment of the present invention. It is a communication procedure figure in the conventional radio | wireless communications system.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a configuration diagram of a radio communication system according to an embodiment of the present invention.

  The base station 30 is connected to a mobile device (mobile station 20) by a wireless line. The mobile device 20 receives a signal from the base station 30, measures the reception intensity of the signal transmitted from the base station 30, and obtains a carrier-to-interference noise ratio (C / I). The C / I is obtained by despreading the signal transmitted from the base station 30 and integrating the signal to obtain the power ratio between the signal related to its own spreading code and the other signal (noise).

  Then, the mobile device 20 transmits C / I as information regarding the strength of the received signal to the base station 30. Further, when the mobile device 20 is performing data communication and receiving data (during file transfer), the mobile device 20 transmits a data download status to the base station 30.

  In the base station 30, for each mobile device 20 in communication with the base station 30, communication resources allocated to the mobile device (based on the received signal strength of the mobile device 20 and the file transfer progress status transmitted from the mobile device 20) The base station 30 notifies the mobile station 20 of the communication resource (the communication allocation time or the modulation scheme that affects the communication speed or the error correction scheme).

  In the present embodiment, the communication allocation time and communication speed as communication resources (communication resources) are changed. The communication allocation time is a time allocated to each mobile device 20 in the frame, and a signal transmission time (received by the mobile device 20) to the mobile device 20 communicating with the base station 30 every frame (400 msec). Time) and increasing / decreasing this allocated time for each mobile device changes the data transfer rate for that mobile device 20.

  In addition, the communication speed (data rate) can be changed by changing the modulation method or error correction method. That is, since how many bits of information are added to one symbol varies depending on the modulation method, changing the modulation method can change the transmission rate of the digital signal without changing the bandwidth. Specifically, the modulation system is QPSK (4-phase phase modulation system) capable of transmitting information of 2 bits per symbol (1 symbol can take 4 values) and 3 bits per symbol (8 values per symbol). 8PSK (8-phase phase modulation system) that can transmit information of 4 bits (one symbol can take 16 values) and 16QAM (4-phase amplitude phase modulation system) that can transmit information of 4 bits per symbol By switching, the amount of information (number of bits) included in one symbol is changed, and the communication speed is changed.

  Further, since the strength of error correction depends on the length of the error correction code, if a strong error correction method is used, the coding rate is lowered, and the amount of information used for original data transmission is reduced. Therefore, the communication speed (data rate) changes by changing the error correction method. Specifically, when a convolutional encoder is used as an encoder that encodes data to be transmitted, the communication speed is slow. However, when a turbo encoder (consisting of a convolutional encoder and an interleaver) is used, the coding rate The communication speed becomes faster.

  In the wireless communication system of the present embodiment, the communication speed for the mobile device 20 is changed based on the carrier-to-interference noise ratio (C / I) of the signal from the base station 30 received by each mobile device 20. In the wireless communication system of the present embodiment, if a certain mobile device 20 has good C / I, control is performed so that a large number of communication resources are allocated to the mobile device 20. That is, by increasing the communication allocation time for the mobile device 20, changing the modulation method (increasing the number of bits per symbol), and changing the error correction method (increasing the coding rate), the mobile device 20 Increase the communication speed for. If the C / I of a certain mobile device 20 is inferior, control is performed so that less communication resources are allocated to the mobile device 20 by changing the allocation time, modulation method, and error correction method. The data communication speed for 20 is reduced. Therefore, the communication to the mobile device 20 having a good communication state is terminated early, and the transmission efficiency (throughput) is improved as a whole in the sector of the base station 30.

  Further, in the present embodiment, when the mobile device 20 that is transferring a file receives a predetermined percentage of data, the communication allocation time for the mobile device 20 is increased from the normal state, or the communication speed to the mobile device 20 is increased. The file transfer to the mobile device 20 is finished promptly.

  The mobile device 20 receives a signal from the base station 30 and transmits to the base station 30 a download progress status indicating how far the file transfer has progressed in addition to the signal strength information (C / I). Based on the download progress information from the mobile device 20, the base station 30 determines the progress status of the file transfer to the mobile device 20 (whether the file transfer has progressed to a predetermined rate) and moves the file. If the file transfer to the device 20 has progressed to a predetermined rate, the allocation of communication resources to the mobile device 20 is increased. This change in communication resource is performed by changing the communication allocation time and communication speed (modulation method, error correction method) for the mobile device 20.

  Since the download progress status includes information on the capacity of the file to be transferred in the header portion of the file, the mobile device 20 obtains the download progress information from the file capacity information and the amount of data received by the mobile device 20. be able to.

  The change in the communication allocation time based on the download progress status is based on the ratio of the transferred data (download progress information) of the file being transferred. When the amount of transferred data increases and the remaining (untransferred) data decreases, Control is performed to increase the communication allocation time.

  Specifically, if the data download has progressed beyond a predetermined rate, the communication allocation time is increased and file transfer to the mobile device 20 is promoted. In this embodiment, the threshold value is set to 90% and the communication allocation time is changed in two stages. However, control may be performed so that the communication allocation time is changed in several stages.

  Further, the base station 30 changes the communication speed (data rate) by changing the modulation method according to the download progress status. That is, since how many bits of information are added to one symbol varies depending on the modulation method, changing the modulation method can change the transmission rate of the digital signal without changing the bandwidth. Specifically, the modulation system is QPSK (4-phase phase modulation system) capable of transmitting information of 2 bits per symbol (1 symbol can take 4 values) and 3 bits per symbol (8 values per symbol). 8PSK (8-phase phase modulation system) that can transmit information of 4 bits (one symbol can take 16 values) and 16QAM (4-phase amplitude phase modulation system) that can transmit information of 4 bits per symbol By switching, the amount of information (number of bits) included in one symbol is changed, and the communication speed is changed.

  Also, the base station 30 changes the communication speed by changing the error correction method according to the download progress status. In other words, since the strength of the error correction method depends on the length of the error correction code, if a strong error correction method is used, the coding rate is lowered and the amount of information used for original data transmission is reduced. Therefore, the communication speed changes by changing the error correction method. Specifically, when a convolutional encoder is used as an encoder that encodes data to be transmitted, the communication speed is slow. However, when a turbo encoder (consisting of a convolutional encoder and an interleaver) is used, a coding rate is reduced. The communication speed becomes faster.

  In the present embodiment, the mobile device 20 transmits a carrier-to-interference noise ratio (C / I) as information related to the strength of the received signal to the base station 30, but transmits RSSI as the received signal strength information, The communication resources (communication allocation time, communication speed) for the mobile device 20 may be increased or decreased. Thus, if RSSI is transmitted to the base station 30 as received signal strength information, the received signal strength can be obtained without requiring integration by the mobile device 20, and the processing of the mobile device 20 can be simplified.

  In addition, the mobile device 20 monitors the file transfer status (download progress status) and transmits the information to the base station 30. However, the server that is the data transmission source receives the file transfer status (download progress status). May be transmitted to the base station 30 to increase communication resources (communication allocation time, communication speed) for the mobile device 20 receiving the data. If comprised in this way, the increase in the traffic of a radio area can be suppressed.

  In the present embodiment, the mobile device 20 transmits information on the file transfer status (download progress status) to the base station 30, but the mobile device 20 responds to its own station based on the file transfer status. A request value for communication resource allocation is determined, and a priority allocation request is transmitted to the base station 30 so that the base station 30 increases communication resources (communication allocation time, communication speed) for the mobile device 20. Good.

  In this embodiment, the communication resource (communication allocation time, communication speed) of the mobile device 20 is changed depending on the file transfer status (download progress status) for the mobile device 20, but the data retransmission rate The communication resources (communication allocation time, communication speed) of the mobile device 20 can be changed. Specifically, an error detection code (for example, a CRC code) is attached to each packet to which data is transferred. Therefore, as a result of the check using the CRC code, it can be determined whether the packet is correct or incorrect. If there is an error, the mobile device 20 requests the base station 30 to retransmit the data and receives the packet retransmission.

  The mobile station 20 knows the number of packets related to this retransmission (the number of packets requested or discarded) in the application layer, calculates the retransmission rate from this data, and reports it to the base station 30. When the data retransmission rate is high, the base station 30 controls the communication allocation time and the communication speed so as to increase the communication resources of the mobile device. Specifically, as described above, it is possible to control the communication allocation time for each mobile device in the frame, and control the communication speed by the modulation method and error correction method to transfer a large amount of data to the mobile device. Like that.

  As described above, without transmitting the retransmission rate from the mobile device 20 to the base station 30, the mobile device 20 determines whether the communication resource is excessive or insufficient (if the retransmission rate is high, the resource is insufficient), and the base station 30 The base station 30 may increase the communication resources (communication allocation time, communication speed) for the mobile device 20 by transmitting a priority allocation request to the mobile station 20.

  FIG. 2 is a diagram illustrating a change in communication allocation time in the wireless communication system according to the embodiment of this invention.

  In Fig.2 (a), the communication allocation time to each mobile station (MS1-MS4) is equal. This is a state in which the C / Is as the received signal strength information transmitted from each mobile device (MS1 to MS4) are equal and the file transfer is not progressing so much (immediately after the start of downloading).

  In FIG. 2B, the communication allocation time for the mobile device MS1 is set longer than that for the other mobile devices (MS2 to MS4). That is, when the file download with respect to MS1 is compared with a predetermined ratio (for example, 90%) and the ratio is exceeded, the base station 30 increases the communication allocation time to MS1. As a result, the file transfer to the MS 1 is completed early, and the possibility that the file is retransmitted due to the deterioration of the communication environment is reduced, and the line by the MS 1 can be opened early.

  FIG. 3 is a timing diagram showing a communication procedure in the wireless communication system according to the embodiment of the present invention. In this figure, a base station (BS) communicates with four mobile devices (MS1 to MS4).

  The base station 30 transmits a pilot signal, which is a signal of a specific pattern, to the mobile devices 20 at the beginning of each frame. Each mobile device 20 receives the pilot signal transmitted from the base station 30 and transmits the C / I as the received signal strength information and the download progress status to the base station 30.

  On the other hand, the base station 30 determines a communication allocation time for each mobile station 20 in the next frame, and transmits a control signal (assign signal, Assign) following the pilot signal of the next frame. This assignment signal includes information on the timing time for each mobile device 20 to be received by each mobile device 20.

  Then, the transmission signal from the base station 30 to each mobile device 20, that is, the information on the reception timing of each mobile device 20 is broadcast to the mobile device 20 at the same time and specified by the assignment signal following the pilot signal of the next frame. . Each mobile device 20 receives a signal from the base station 30 at the time allocated by the control signal (Assign).

  In FIG. 3, as shown in FIG. 2B, the base station 30 performs control so that the communication allocation time for the mobile device 20 (MS1) increases.

  FIG. 4 is a block diagram of the mobile device 20 according to the embodiment of this invention.

  The antenna 1 is connected to the transmission unit 2 and the reception unit 3, receives radio waves (downlink signals) from the radio base station 30, and transmits radio waves (uplink signals) to the radio base station 30. The radio unit 2 includes a transmission unit 3 and a reception unit 4, and the transmission unit 3 generates a high frequency signal transmitted from the antenna 1. The receiving unit 4 amplifies and frequency-converts the high frequency signal received by the antenna 1 and outputs it to the berth band processing unit 5 as a baseband signal. The baseband processing unit 5 includes a plurality of demodulation circuits, and selects and demodulates a demodulation circuit suitable for the modulation scheme designated by the base station 30. The demodulated signal is sent to the encoding / decoding unit 6, and is decoded into an audio signal and a data signal by the encoding / decoding unit 6. The encoding / decoding unit 6 includes a plurality of decoders, and decodes by a method (error correction method) designated by the base station 30 to generate an audio signal and a data signal.

  The encoding / decoding unit 6 includes a plurality of encoders, and encodes a voice signal and a data signal using an error correction method designated by the base station 30. The encoded signal is sent to the baseband processing unit 5 where it is modulated. The baseband processing unit 5 has a plurality of modulation circuits, and selects and modulates a modulation circuit suitable for the modulation method designated by the base station 30. The modulated signal is converted into a high-frequency signal by the transmission unit 3 and radiated from the antenna 1.

  The control unit 9 controls each unit of the mobile phone such as the radio unit 2, the baseband processing unit 5, and the encoding / decoding unit 6. The transmission unit 3 controls the transmission frequency and the output of the radio wave to be transmitted, and the reception unit 4 controls the reception frequency. In addition, character information and display data for displaying the operating state of the mobile phone are sent to the display unit (not shown), and characters and numbers are input from the input unit (not shown) and the operation to the mobile phone is performed. Accept instructions.

  Furthermore, the control unit 9 exchanges data signals transmitted / received to / from the base station 30 with the encoding / decoding unit 6. Then, the transfer progress status of data transmitted from the base station 30 is monitored, and download progress status data to be transmitted to the base station 30 as an assignment signal is generated.

  In the embodiment of the present invention, the base station 30 uses the value of at least one of the received signal strength (RSSI) and the carrier-to-interference noise ratio (C / I) of the signal transmitted from the base station 30 in the mobile device 20. The allocation of communication resources to the mobile device 20 is changed. Further, when data transfer to a certain mobile device proceeds when transferring data to the mobile device 20, the base station 30 changes the allocation of communication time for the mobile device and uses it for communication with each mobile device 20. When data transmission to the mobile device 20 proceeds by increasing the allocation of communication resources to the mobile device 20 by means such as changing the modulation method and changing the error correction method used for communication with each mobile device 20 Since the communication speed to the mobile device 20 is improved, it is possible to suppress interruption of data transfer after the data transfer to the mobile device 20 has progressed, and the transmission efficiency (throughput) as a whole in the sector of the base station 30 is improved. ) Can be improved.

  Further, the data transfer progress status to the mobile device 20 is transmitted from the mobile device 20 to the base station 30, and the base station 30 changes the allocation of communication resources to the mobile device 20 according to the signal from the mobile device 20, There is no need to monitor the amount of data that the station 30 has passed. That is, the data transfer amount may be end-to-end processing between the mobile device 20 and the information providing server, and there is no need for special processing at the base station 30 located between the mobile device 20 and the information providing server. Therefore, the processing of the base station 30 is reduced.

  Further, the base station 30 has at least one of the signal strength (RSSI) transmitted from the base station 30 in the mobile device 20 and the carrier-to-interference noise ratio (C / I) of the signal transmitted from the base station 30. Depending on the value, the allocation of communication resources to the mobile device is changed, and when the base station 30 transfers data to the mobile device 20, if the data transfer to a certain mobile device proceeds, the allocation of the communication time to the mobile device , Changing the modulation method used for communication with each mobile device 20 or changing the error correction method used for communication with each mobile device 20 increases the allocation of communication resources to the mobile device 20 Therefore, when transmitting continuous data such as video, the data is not in time due to retransmission, data continuity is lost, and data loss (video is not connected) is suppressed. Rukoto can.

  Further, the data retransmission rate to the mobile device 20 is transmitted from the mobile device 20 to the base station 30, and the base station 30 changes the allocation of communication resources to the mobile device based on the signal from the mobile device 20, There is no need to monitor the amount of data retransmitted by the base station 30, and the processing of the base station 30 is reduced.

DESCRIPTION OF SYMBOLS 1 Antenna 2 Radio | wireless part 3 Transmitter 4 Receiving part 5 Baseband process part 6 Encoding / decoding part 7 Transmission part 8 Reception part 9 Control part 10 Storage part 11 Display part 12 Operation part 20 Mobile device (cell-phone)
30 base station

Claims (9)

In a wireless communication system in which a base station and a terminal are connected and the base station communicates with a plurality of terminals simultaneously,
The base station communicates resources for the plurality of terminals according to at least one of a strength at which the terminal receives a signal transmitted from the base station and a signal-to-noise ratio of a signal transmitted from the base station. Change the allocation of
The base station, when transferring data to the terminal, changes the allocation of communication resources to the terminal according to the progress of data transfer to the terminal. The terminal transmits a progress status of data transfer transmitted from the base station to the base station,
The radio communication method according to claim 1, wherein the base station changes allocation of communication resources to the terminal according to a progress of data transfer transmitted from the terminal.   The wireless communication method according to claim 1 or 2, wherein when data transfer to the terminal proceeds, allocation of communication resources to the terminal is increased. In a wireless communication system in which a base station and a terminal are connected and the base station communicates with a plurality of terminals simultaneously,
The base station communicates resources for the plurality of terminals according to at least one of a strength at which the terminal receives a signal transmitted from the base station and a signal-to-noise ratio of a signal transmitted from the base station. Change the allocation of
The base station, when transferring data to the terminal, changes allocation of communication resources to the terminal according to a retransmission rate of data to the terminal. The terminal transmits a retransmission rate of data transmitted from the base station to the base station,
The radio communication method according to claim 4, wherein the base station changes allocation of communication resources to the terminal according to a retransmission rate of data transmitted from the terminal.   6. The wireless communication system according to claim 4, wherein when a retransmission rate of data to the terminal is high, allocation of communication resources to the terminal is increased.   The change in allocation of the communication resource changes at least one of allocation of communication time to each terminal, modulation scheme used for communication with each terminal, or error correction scheme used for communication with each terminal. The wireless communication system according to claim 1, wherein the wireless communication system is a wireless communication system. While changing the allocation of communication resources for the plurality of terminals according to at least one of the strength at which the terminal receives the signal transmitted from the base station and the signal-to-noise ratio of the signal transmitted from the base station, In a terminal that communicates with a base station that communicates simultaneously with the terminal,
The terminal comprises a means for transmitting a progress of data transfer to the terminal to the base station in order to change the allocation of communication resources to the terminal in the base station. While changing the allocation of communication resources for the plurality of terminals according to at least one of the strength at which the terminal receives the signal transmitted from the base station and the signal-to-noise ratio of the signal transmitted from the base station, In a terminal that communicates with a base station that communicates simultaneously with the terminal,
The terminal comprises a means for transmitting a retransmission rate of data to the terminal to the base station in order to change the allocation of communication resources to the terminal in the base station.