JP2006279855A - Wireless communication system and communication control method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless communication system for detecting a data amount of communication and applying optimum control to a data transmission rate and its transmission output, and to provide a communication control method thereof. <P>SOLUTION: The wireless communication system is provided with: a data amount detection means 21 that detects a data amount of a signal transmitted and received between a plurality of wireless communication apparatuses; a transmission rate setting means 22 that sets a transmission rate of the signal transmitted and received between the wireless communication apparatuses on the basis of the data amount detected by the data amount detection means 21; an output control setting means 23 for setting a transmission output; and a signal transmission/reception means 24 for transmitting and receiving the signal from other wireless communication apparatuses in accordance with a set transmission rate and a set transmission output. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a system and method for improving frequency utilization efficiency in wireless data communication, and more particularly, to a wireless communication system that optimally controls data amount, data transmission rate, and transmission output thereof in a communication environment, and communication therefor It relates to a control method.

Wireless communication has a feature that the mutual communication state varies greatly depending on the coverage area of the wireless base station and the location where the wireless terminal moves. Further, unlike voice communication, data communication has a feature that the amount of data in uplink (wireless terminal → base station) and downlink (base station → wireless terminal) differs depending on the usage. In order for many wireless terminals to perform data communication sharing a limited frequency, how to effectively use the frequency is an important issue. Patent Document 1 discloses a frequency band according to the amount of traffic. A digital satellite communication system that detects the amount of traffic and adaptively controls the code rate and the modulation rate is described. However, according to this method, it is effective as a means for effectively using the frequency, but there is a problem that it is not sufficient to reliably communicate with the other party without causing interference such as interference to other radios. is there.
JP-A-7-123039

  The present invention has been made to solve such a problem, and an object of the present invention is to detect a data amount of communication and optimally control a data transmission rate and a transmission output thereof and a communication control thereof. Is to provide a method.

A wireless communication system according to the present invention is a wireless communication system that performs communication between a plurality of wireless communication devices having an antenna that transmits and receives wireless signals and a transmission and reception circuit that performs transmission and reception processing of signals transmitted and received by the antennas.
A data amount detecting means for detecting a data amount of the signal transmitted and received between the plurality of wireless communication devices;
Setting means for setting a transmission speed and a transmission output of the signal transmitted and received between the wireless communication devices based on the data amount detected by the data amount detection means;
Signal transmitting and receiving means for transmitting and receiving the signal between the wireless communication devices in accordance with the transmission speed and the transmission output set by the setting means.

The setting means of the wireless communication system of the present invention is characterized in that the transmission rate is set by setting a modulation method at the time of transmission / reception of the signal.

The setting means of the wireless communication system of the present invention is characterized in that the transmission rate is set higher when the data amount is large than when the data amount is small.

The setting means of the wireless communication system of the present invention is characterized in that the transmission output is set higher when the amount of data is large than when it is small.

The setting means of the wireless communication system of the present invention is characterized in that the transmission rate is set according to the transmission output set based on the data amount.

The wireless communication system of the present invention further includes signal quality detection means for detecting signal quality at the time of transmission and reception of the signal between the plurality of wireless communication devices,
The signal quality detection means detects the signal quality according to the transmission output set based on the data amount by the setting means,
The setting means sets the transmission rate according to the signal quality corresponding to the transmission output detected by the signal quality detection means and set based on the data amount.

The wireless communication system of the present invention further includes signal quality detection means for detecting signal quality at the time of transmission and reception of the signal between the plurality of wireless communication devices,
The setting means sets the transmission rate according to the data amount detected by the data amount detection means and the signal quality detected by the signal quality detection means.

The wireless communication system of the present invention further includes signal quality detection means for detecting signal quality at the time of transmission and reception of the signal between the plurality of wireless communication devices,
The setting means includes a transmission speed initial setting means for setting an initial transmission speed according to the signal quality detected by the signal quality detection means, and the data amount or the data amount detected by the data amount detection means. Transmission rate setting means for determining the transmission rate by changing the initial transmission rate in accordance with at least one of the transmission outputs set in accordance with the transmission output.

The signal quality detection means of the wireless communication system of the present invention detects the signal quality according to the transmission output set according to the data amount,
The transmission rate setting unit determines the transmission rate by changing the initial transmission rate according to the signal quality detected by the signal quality detection unit according to the transmission output set according to the data amount. It is characterized by doing.

The setting means of the wireless communication system of the present invention comprises transmission rate setting means for setting the transmission rate, and output setting means for setting the transmission output,
The transmission speed setting means sets the transmission speed based on the data amount detected by the data amount detection means,
The output setting means sets the transmission output according to the transmission speed set based on the data amount by the transmission speed setting means.

In the wireless communication system of the present invention, when the data amount detected by the data amount detection means is a predetermined value or more, the output setting means increases the transmission output according to the data amount, The transmission speed setting means sets the transmission speed in accordance with the data amount after the output setting means sets the transmission output to be increased based on the data amount.

A communication control method for a radio communication system according to the present invention is a radio that performs radio communication between a plurality of radio communication devices having an antenna that transmits and receives radio signals and a transmission and reception circuit that performs transmission and reception processing of signals transmitted and received by the antennas. In a communication control method of a communication system,
Detecting a data amount of the signal transmitted and received between the plurality of wireless communication devices, and setting a transmission output and transmission speed of the signal in transmission and reception of the signal based on the detected data amount;
The signal is transmitted and received according to the set transmission output and the transmission speed.

The communication control method of the wireless communication system of the present invention further includes setting the transmission output according to the transmission rate set according to the data amount after setting the transmission rate based on the data amount. Characterize

The communication control method for a wireless communication system according to the present invention is further characterized in that, when the data amount is equal to or greater than a predetermined value, the transmission rate is set based on the data amount after the transmission power is set to be increased.

  According to the wireless communication system and the communication control method of the present invention, a wireless communication device that performs data communication shares a limited frequency without causing interference such as interference to many other wireless communication devices, It becomes possible to communicate with the other party without fail. For this reason, the frequency utilization efficiency is improved. Further, by optimizing the transmission output, the power consumption in the wireless communication device can be reduced.

  Embodiments of a wireless communication system according to the present invention will be described with reference to the drawings. FIG. 1 is a hardware block diagram showing the configuration of a wireless communication apparatus in the wireless communication system of the present invention. The wireless communication device 10 includes a transmission / reception circuit 20 and an antenna 30 and functions as a wireless base station or a wireless terminal. The radio base station and the radio terminal form a radio network with a plurality of other radio base stations or radio terminals by radio waves and are systematically linked. Accordingly, the wireless communication device 10 functioning as a wireless terminal transmits / receives digital data to / from other similar wireless terminals via a base station having the same function.

  First, a case is assumed where a certain wireless terminal communicates with a communication terminal such as another wireless terminal via a base station. In FIG. 1, the transmission / reception circuit 20 includes a data amount detection unit 21, a transmission rate setting unit 22, an output control unit 23, and a signal transmission / reception unit 24. The wireless communication device 10 transmits a data signal from the transmission / reception circuit 20 to the base station through the antenna 30 in order to perform data communication with another wireless terminal as a wireless terminal. At this time, the data amount detection means 21 detects the data amount of the transmission data from the baseband on the transmission side of the signal transmission / reception means 24 and sends the data amount to the transmission speed setting means 22 and the output control means 23 as setting means. . Therefore, the signal transmission / reception means 24 has a wireless transmission / reception function of a normal wireless base station or wireless terminal as a standard function.

  Based on the data amount detected by the data amount detection means 21, the transmission speed setting means 22 sets an optimum modulation method from among the modulation methods possessed by the signal transmission / reception means 24 and modulates the transmission signal (data). . The modulation scheme of this signal is selected and set from BPSK, QPSK, 8PSK, 12QAM, 16QAM, 24QAM, and the like. The output control unit 23 sets the gain of the transmission power amplifier included in the signal transmission / reception unit 24 to a predetermined value based on the detected data amount. The transmission power amplifier amplifies the power of the modulated signal according to the set value, and transmits the amplified signal to the base station via the antenna 30.

  The transmission rate setting means 22 sets the transmission rate (modulation method) so that the transmission rate is higher when the data amount is large than when it is small, but using a method other than the selection of the modulation method. The transmission speed may be increased. The output control unit 23 sets the transmission output so that the transmission output is higher when the data amount is large than when the data amount is small. However, the output control unit 23 sets the data amount only when the data amount exceeds a predetermined value. Accordingly, the transmission output may be set higher. Further, the transmission speed setting means 22 may set the transmission speed based on the output signal of the output control means 23 in addition to setting the transmission speed based on the data amount of the data amount detection means 21.

  Next, it is assumed that the base station transmits a radio signal transmitted from a certain radio terminal to another radio terminal. FIG. 2 is a hardware block diagram showing a configuration of a base station as another wireless communication apparatus in the wireless communication system of the present invention. The transmission / reception circuit 20 'of the radio communication device 10' further includes signal quality detection means 25 '. In the base station, the antenna 30 'and the signal transmission / reception means 24' receive the radio waves transmitted by the transmission / reception circuit 20 of a certain wireless terminal using the modulation scheme and transmission power set based on the data amount. The signal quality detection means 25 'obtains the CN ratio (Carrier to Noise ratio) of the received signal strength indication signal (RSSI) of the signal transmission / reception means 24', determines the signal quality, and generates a signal quality signal. This signal quality signal is sent to the transmission rate setting means 22 'to set the transmission rate. The data amount detecting means 21 'detects the data amount of the received data from the baseband on the receiving side of the signal transmitting / receiving means 24'.

  FIG. 3 is a correlation diagram showing the correlation between the CN ratio obtained from the signal transmitting / receiving means 24 ′ and the data amount on the same time axis. In phase 1, the amount of received data is less than or equal to a predetermined value, so that control for increasing the power is not performed. Accordingly, the signal transmission / reception means 24 'selects the modulation scheme received by the transmission rate setting means 22', and the output control means 23 'outputs a transmission signal to other wireless terminals with power corresponding to the power at the time of reception. Since the amount of data exceeds the predetermined value in phase 2, control for increasing the power is performed by the output control means 23 '. In phase 3, the amount of data is less than a predetermined value and the CN ratio is very large. Therefore, the transmission rate setting means 22 'and the output control means 23' perform control to lower the transmission power or increase the data rate. In phase 4, the same control as in phase 2 is performed. In phase 5, the same control as in phase 3 is performed.

  The transmission speed setting means 22 'determines the data transmission speed based on the signal quality signal obtained by the signal quality detection means 25' and the data amount obtained by the data amount detection means 21 '. The transmission rate may be determined only by the signal quality signal obtained by the quality detection means 25 '. Further, the transmission speed setting means 22 'has a transmission speed initial setting means, the signal quality detection means 25' sets the initial transmission speed of the transmission speed initial setting means based on the signal quality signal obtained from RSSI, and the data amount The transmission rate may be set by changing the set initial transmission rate according to the data amount obtained by the detection unit 21 'or the output control signal obtained from the output control unit 23'. The transmission rate (modulation method) set according to the signal quality and the data amount by the transmission rate setting means 22 'on the base station side is different from the transmission rate (modulation method) of the signal transmitted from the wireless terminal side. In this case, the signal transmitting / receiving unit 24 ′ transmits a control signal to the wireless terminal so that the signal is transmitted at the transmission rate (modulation method) set by the transmission rate setting unit 22 ′.

  Assuming the case where a certain wireless terminal communicates with another wireless terminal via the base station, the modulation scheme for determining the transmission rate from the transmission data amount and the transmission power (transmission output) are set. Assuming that the station receives it and relays it to another wireless terminal, explains how to set the modulation method that determines the transmission rate from the signal quality of the received signal and the data amount, and to set the transmission power from the data amount did. Therefore, after that, when another wireless terminal continuously communicates with a certain wireless terminal that has received the transmission signal of the base station for the first time, the wireless communication device 20 determines the transmission rate (modulation) from the signal quality and the signal data amount. System) and the transmission output (transmission power) from the amount of data. Here, since the base station mediates the wireless terminal, the signal quality based on the first received signal is not a signal quality indicating the radio wave environment of the first wireless terminal that is the transmission destination. For this reason, the transmission rate and transmission power may be determined only by the data amount described with reference to FIG. 1, or may be performed using this signal quality when the wireless terminal is within the cover area. From the second time on, the previous signal quality is set as a reference.

  In addition, when the wireless terminal first starts communication, only the transmission data amount is used for the control signal without detecting the signal quality, but the wireless terminal always receives the area management control signal transmitted by the base station. Therefore, it may be used by inputting it to the signal quality detection means 25 '. Further, the output control means 23 'may be provided with output changing means for changing the output based on the output signal of the transmission speed setting means 22' in addition to setting the transmission speed based on the data amount of the data amount detection means 21 '. good.

  The hardware configuration shown in FIGS. 1 and 2 may be any circuit or device as long as it is a means for realizing the function, and a part of the function can be realized by software. . Furthermore, the function realizing means may be realized by a plurality of circuits, and a plurality of functions may be realized by a single circuit.

  FIG. 4 is a flowchart showing a flow of control processing of the wireless communication system in the present invention. Here, radio communication between radio communication apparatus 10 as a radio terminal and radio communication apparatus 10 'as a radio base station will be described as an example.

  First, in step S1, the wireless communication device 10 and the wireless communication device 10 ′ each determine whether or not a connection by wireless communication has been started with another wireless communication device. In step S1, if each wireless communication device 10, 10 ′ does not determine the start of connection, the process returns to the beginning. When the wireless communication device 10 and the wireless communication device 10 ′ determine the start of connection by wireless communication between the two, the process proceeds to step S2, and the signal quality of the wireless communication between the two wireless communication devices 10, 10 ′ is improved. Measure. The signal quality is measured, for example, by signal quality detection means 25 'provided in the radio communication device 10' serving as a base station device, during signal communication with the radio communication device 10. .

  Then, the process proceeds to step S3, and an initial modulation method (initial transmission rate) of the transmission signal at the time of communication between the two wireless communication devices 10, 10 'is determined. Here, the modulation scheme is set based on the signal quality measured in step S2, and the transmission rate setting means 22 'of the radio apparatus 10' inputs the signal quality detected from the signal quality detection means 25 '. The transmission signal modulation scheme is set according to the signal quality. Here, the modulation scheme is basically set such that the better the signal quality, the more the multi-level modulation scheme. Then, by setting the transmission signal modulation method by the transmission speed setting means 22 ', the transmission speed of the transmission signal (data) between the wireless communication devices 10 and 10' communicating with each other is set. As the signal quality is better, the modulation scheme is set to the multi-level modulation scheme and the transmission speed is increased.

  The radio communication device 10 ′ modulates the transmission signal by the signal transmission / reception unit 24 ′ according to the modulation scheme set by the transmission rate setting unit 22 ′, and transmits this transmission signal to the radio communication device 10. When the modulation scheme is set by the transmission rate setting means 22 ', the radio communication device 10' transmits control information related to the modulation scheme by the control signal transmitted from the signal transmitting / receiving means 24 'via the antenna 30'. Transmit to the wireless communication device 10. When receiving a control signal including control information related to the modulation scheme, the wireless communication device 10 is configured to demodulate the received transmission signal in accordance with the modulation scheme.

  When the modulation method (transmission rate) is set in step S3, the process proceeds to step S4, where it is determined whether the signal quality is sufficient. Here, the output control means 23, 23 ′ of the radio communication devices 10, 10 ′ determines whether or not the signal quality measured in step S 2 and the transmission output for the modulation scheme set in step S 3 are sufficient. The transmission output here is an output at the time of signal transmission in the radio communication device on the transmission side, and if it is determined that there is a margin in the transmission output, the process proceeds to step S5, and the output control means 23, 23 ' The output control is performed so as to reduce the output during signal transmission in the wireless communication apparatus.

  If it is determined in step S4 that the signal quality is insufficient, that is, the transmission output is insufficient, the process proceeds to step S6, and the output control means 23, 23 'performs signal transmission in the wireless communication device on the transmission side. Output control is performed so that the output of the hour is increased. When the transmission output is controlled to increase in step S6, the process returns to step S3, and the modulation system is set (changed) according to the output adjusted in step S6. That is, when the transmission output for the modulation scheme set in step S3 is insufficient in step S4 and the transmission output is increased in step S6, the modulation scheme is changed again in step S3. By setting (changing), it is possible to suppress an increase in output more than necessary. For example, the amount of increase in transmission output can be reduced by changing the modulation method to a low-value modulation method.

  Then, after it is determined in step S4 that the signal quality (or transmission output for the modulation scheme) is optimal or the output is reduced in step S5, the process proceeds to step S7, and transmission / reception is performed between the radio communication apparatuses 10, 10 '. The data amount of the communication signal to be transmitted is measured by the data amount detecting means 21 and 21 'of the wireless communication device 10, 10'.

  Next, the process proceeds to step S8. In step S7, the data amount measured by the data amount detection means 21, 21 'is determined. If it is determined that the data amount is equal to or greater than the first predetermined value, the process proceeds to step S9. In this step S9, the output control means 23, 23 'inputs the data amount information output from the data amount detection means 21, 21', and the larger the data amount based on this data amount information, the more the radio on the transmitting side. The output at the time of signal transmission in the communication device is increased. When the output is increased in step S9, the process returns to step S2, the signal quality is measured according to the transmission output adjusted in step S9, and in step S3 according to the remeasured signal quality. Set (change) the modulation method. If the data amount is large, such as a value equal to or greater than a predetermined value, the transmission output is increased according to the data amount, and the modulation method is determined according to the signal quality after the transmission output is increased. Is set (changed), and the modulation method is changed to the high value modulation method. Also, when the amount of data is large, the transmission output is increased before the modulation method is changed to the high value modulation method, so the modulation method is changed to the high value modulation method with improved (maintained) communication stability. can do.

  If it is determined in step S8 that the data amount measured by the data amount detection means 21, 21 'is small, for example, the data amount is smaller than the second predetermined value (<first predetermined value), the process returns to step S3. The transmission rate setting means 22 and 22 'input the data amount information from the data amount detecting means 21 and 21' to change the modulation method according to the determined data amount, and the modulation method according to the data amount information. Set (change). Therefore, when the amount of data is small, communication control is performed at a low transmission rate by changing the modulation method to the low-value modulation method.

  In step S8, the data amount of the communication signal detected by the data amount detection means 21, 21 'is optimum, that is, the data amount is smaller than the first predetermined value and equal to or larger than the second predetermined value. If it is determined that the data amount is suitable for the modulation method set in step S3 and the output adjusted in steps S4 to S6, the process proceeds to step S10. In step S10, it is determined whether or not the connection is maintained. If it is determined that the connection is maintained, the process returns to step S2 and the above-described flow is repeated, and the connection is not maintained, that is, the connection is interrupted. If it is determined, the process returns and returns to the beginning.

  As described above, in the wireless communication system according to the present embodiment, when wireless communication is performed between the wireless communication devices 10 and 10 ', if the data amount of the communication signal measured in step S8 is large, the step is performed. In S9, output control is performed so that the output in the wireless communication apparatus on the transmission side is increased, and the transmission rate (modulation method) is set (changed) according to the signal quality after the output control. When the data amount is small, the transmission rate (modulation method) is set (changed) according to the data amount. In addition, after the transmission rate (modulation method) is set (changed), it is determined whether the transmission output for the signal quality or the modulation method is sufficient, and the transmission output is increased or decreased according to the determination result, Communication stability can be improved and power saving of the transmitting side wireless communication device can be achieved.

  Note that output control is performed only when the amount of data is large, but output control is performed before setting (changing) the modulation method even when the amount of data is small (in this case) The output may be reduced). Further, when it is determined in step S8 that the data amount is small, the process may return to step S2, and after the signal quality is measured, the modulation scheme may be set in step S3. If it is determined in step S8 that the amount of data is large and output control is performed in step S9, the modulation method is changed in step S3 without measuring the signal quality in step S2. It may be configured.

  Further, after the connection start is determined, an initial modulation scheme (initial transmission rate) is set according to the signal quality in step S3, and then the initial modulation scheme is changed according to the data amount of the communication signal to change the transmission rate. Measure the data amount of the communication signal after the start of connection, set the initial modulation method and output according to this data amount and signal quality, and continue communication during subsequent communication You may comprise so that a modulation system and an output may be changed according to the data amount of a signal.

  As described above, wireless terminals and wireless base stations that perform digital data communication communicate with optimized data transmission speed and transmission power (transmission output) in accordance with the amount of communication signal data. It is possible to reliably communicate with the other party without causing interference such as interference to many other wireless terminals. That is, the use efficiency of the frequency is improved by setting (changing) the transmission rate (modulation method) of the signal based on the data amount of the transmitted / received signal. Also, by increasing / decreasing the transmission output according to the signal quality according to the transmission rate (modulation method) set (changed) based on the data amount, the transmission output can be optimized and the power consumption can be reduced. The power consumption of the device can be reduced. Especially when the amount of data is small, the transmission output can be reduced according to the set modulation method by setting (changing) the modulation method (transmission rate) to the low-value modulation method side. Thus, power saving of the transmitting side wireless communication device can be achieved, and in the case of a wireless communication terminal, the battery life can be extended.

The hardware block diagram which shows the structure of the radio | wireless communication apparatus of the radio | wireless communications system by this invention. The hardware block diagram which shows the structure of the other radio | wireless communication apparatus of the radio | wireless communications system of this invention. The correlation figure of CN ratio and data amount which showed CN ratio and data amount on the same time axis. The flowchart which shows the flow of a process of the radio | wireless communications system of this invention.

Explanation of symbols

10, 10 'Wireless communication device 20, 20' Transmission / reception circuit 21, 21 'Data amount detection means 22, 22' Transmission rate setting means 23, 23 'Output control means 24, 24' Signal transmission / reception means 25 'Signal quality detection means 30 30 antennas

Claims (14)

In a wireless communication system that performs communication between a plurality of wireless communication devices having an antenna that transmits and receives wireless signals and a transmission and reception circuit that performs transmission and reception processing of signals transmitted and received by the antennas,
A data amount detecting means for detecting a data amount of the signal transmitted and received between the plurality of wireless communication devices;
Setting means for setting a transmission speed and a transmission output of the signal transmitted and received between the wireless communication devices based on the data amount detected by the data amount detection means;
A radio communication system, comprising: a signal transmission / reception unit that transmits / receives the signal between the radio communication devices in accordance with the transmission speed and the transmission output set by the setting unit. 2. The wireless communication system according to claim 1, wherein the setting unit sets the transmission rate by setting a modulation method when the signal is transmitted and received. 3. The wireless communication system according to claim 1, wherein the setting unit sets the transmission rate higher when the data amount is large than when the data amount is small. 4. The wireless communication system according to claim 1, wherein the setting unit sets the transmission output higher when the data amount is large than when the data amount is small. The wireless communication system according to claim 1, wherein the setting unit sets the transmission speed according to the transmission output set based on the data amount. Signal quality detection means for detecting signal quality at the time of transmission and reception of the signal between the plurality of wireless communication devices;
The signal quality detection means detects the signal quality according to the transmission output set based on the data amount by the setting means,
The said setting means sets the said transmission rate according to the said signal quality according to the said transmission output detected by the said signal quality detection means and set based on the said data amount. The wireless communication system described. Signal quality detection means for detecting signal quality at the time of transmission and reception of the signal between the plurality of wireless communication devices;
The said setting means sets the said transmission rate according to the said data amount detected by the said data amount detection means and the said signal quality detected by the said signal quality detection means, The Claim 1 thru | or 5. The wireless communication system according to any one of 4 above. Signal quality detection means for detecting signal quality at the time of transmission and reception of the signal between the plurality of wireless communication devices;
The setting means includes a transmission speed initial setting means for setting an initial transmission speed according to the signal quality detected by the signal quality detection means, and the data amount or the data amount detected by the data amount detection means. 5. A transmission rate setting means for determining the transmission rate by changing the initial transmission rate according to at least one of the transmission outputs set according to the transmission rate. The wireless communication system described. The signal quality detection means detects signal quality according to the transmission output set according to the data amount,
The transmission rate setting unit determines the transmission rate by changing the initial transmission rate according to the signal quality detected by the signal quality detection unit according to the transmission output set according to the data amount. The wireless communication system according to claim 8, wherein: The setting means includes a transmission speed setting means for setting the transmission speed, and an output setting means for setting the transmission output,
The transmission speed setting means sets the transmission speed based on the data amount detected by the data amount detection means,
10. The radio according to claim 1, wherein the output setting unit sets the transmission output according to the transmission rate set based on the data amount by the transmission rate setting unit. Communications system. When the data amount detected by the data amount detection means is greater than or equal to a predetermined value, the output setting means increases the transmission output according to the data amount, and the transmission speed setting means outputs the output 11. The wireless communication system according to claim 10, wherein the transmission rate is set according to the data amount after the transmission output is set to be increased based on the data amount by a setting unit. In a communication control method of a wireless communication system that performs wireless communication between a plurality of wireless communication devices having an antenna that transmits and receives wireless signals and a transmission and reception circuit that performs transmission and reception processing of signals transmitted and received by the antennas,
Detecting a data amount of the signal transmitted and received between the plurality of wireless communication devices, and setting a transmission output and transmission speed of the signal in transmission and reception of the signal based on the detected data amount;
A control method of a radio communication system, wherein the signal is transmitted / received according to the set transmission output and the transmission speed. 13. The communication control of the radio communication system according to claim 12, wherein after setting the transmission rate based on the data amount, the transmission output is set according to the transmission rate set according to the data amount. Method. 14. The communication control method for a radio communication system according to claim 13, wherein when the data amount is equal to or greater than a predetermined value, the transmission rate is set based on the data amount after the transmission power is set to increase.

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