JP2010087669A - Radio transmission device, program, and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To observe a condition even when a carrier sense time is changed in a radio transmission device in which an accumulated time of transmitting radio wave per a predetermined time is limited to the condition according to the carrier sense time. <P>SOLUTION: The invention relates to the radio transmission device transmitting radio wave to a radio reception device. The radio transmission device has a means clocking an accumulated time when the radio transmission device performs radio wave transmission from a present time until a predetermined time, a means registering a radio wave transmission condition concerning a corresponding maximum transmission time per carrier sense time, and a means controlling the radio wave transmission by the radio transmission device so as to satisfy the radio wave transmission condition registered by using at least the accumulated time under clocking when a carrier sense time in the radio transmission device is changed from a first carrier sense time to a second carrier sense time. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wireless transmission device, a program, and a method, and can be applied to, for example, a wireless transmission device in which an accumulated time for transmitting radio waves per predetermined time is limited to a condition corresponding to a carrier sense time.

  Use of radio waves transmitted by wireless communication devices may be restricted by laws and regulations. For example, Non-Patent Document 1 describes an example in which the radio wave transmission time per hour is limited to a predetermined time (hereinafter, referred to as “longest transmission time”) in the 950 MHz band depending on the carrier sense time. In Non-Patent Document 1, the following three conditions 1 to 3 are defined as conditions for the carrier sense time and the corresponding radio wave transmission time.

(Condition 1) Carrier sense time: 10 milliseconds or more, radio wave transmission time: no limit (Condition 2) Carrier sense time: 10 microseconds or more, radio wave transmission time: 360 seconds or less per hour
(Condition 3) Carrier sense time: 0 seconds or more, radio wave transmission time: 3.6 seconds or less per hour FIG. 5 shows an example of radio wave transmission in the communication device when the above conditions 1 to 3 are followed. FIG.

In the example shown in FIG. 5, the allowed carrier sense time is determined by the sum of radio wave transmission times per hour before and after. Therefore, in order to comply with the above-described conditions 1 to 3, it is necessary to perform control related to radio wave transmission in the communication device as shown in FIG. For example, in FIG. 5, when the carrier sense time is set to 128 microseconds, it is necessary to ensure that the radio wave transmission time per hour is 360 seconds or less. Specifically, the radio wave transmission time per hour is always measured, and when the radio wave transmission time per hour exceeds 360 seconds during radio wave transmission, the radio wave transmission is stopped. .
Information and Communications Council, “Information and Communications Council, Information and Communication Technology Subcommittee, Power Saving System Committee Report”, [Online], INTERNET, [Retrieved on August 27, 2008], <http: //www.soumu.go .jp / s-news / 2007 / pdf / 071214_1_bt3.pdf>, pp. 38-39

  On the other hand, in the wireless communication apparatus, it is important from the viewpoint of power saving to shorten the carrier sense time. In particular, in a wireless communication device intended to operate with low power, there is a desire to shorten the carrier sense time as much as possible. When the above conditions 1 to 3 are observed, a short carrier sense time is applied. Because there is a problem that the amount of data that can be transmitted per predetermined time is reduced, if the radio wave transmission time per predetermined time may be short, the carrier sense time is changed short to save power, and a large amount temporarily It is desirable to be able to transmit a large amount of data in a short period of time by changing the carrier sense time to 10 milliseconds. However, when the carrier sense time is changed, there is a problem that the above conditions 1 to 3 must be satisfied in 1 hour before and after the changed time.

  Therefore, even if the carrier sense time is changed in a wireless transmission device in which the accumulated time for transmitting radio waves per predetermined time is limited to the condition according to the carrier sense time, the wireless can comply with the condition. A transmission apparatus, program and method are desired.

  In the wireless transmission device of the first aspect of the present invention, (1) the upper limit of the accumulated time for transmitting radio waves is set as the longest transmission time per predetermined time, and the longest transmission time corresponds to the carrier sense time per carrier sense. (2) a radio wave transmission time counting means for counting a cumulative time during which the radio transmission apparatus performs radio wave transmission from a present time to a predetermined time before, (3) Radio wave transmission condition registration means for registering radio wave transmission conditions relating to the longest transmission time corresponding to each carrier sense time; and (4) the carrier sense time in the wireless transmission device from the first carrier sense time. , When trying to change to the second carrier sense time, at least using the accumulated time counted by the radio wave transmission time clock means, the radio wave transmission condition So as to satisfy the radio wave transmission condition registered in the recording means, and having a transmitter controller for controlling the radio transmission by the radio transmitting apparatus.

  The wireless transmission program of the second aspect of the present invention is (1) the upper limit of the accumulated time for transmitting radio waves per predetermined time is set as the longest transmission time, and the longest transmission time depends on the carrier sense time per carrier sense. (2) Radio wave transmission that counts the cumulative time that the radio transmission apparatus transmits radio waves between the present time and a predetermined time before the current time. Time counting means, (3) radio wave transmission condition registration means for registering radio wave transmission conditions relating to the longest transmission time corresponding to each carrier sense time, and (4) carrier sense time in the wireless transmission device When trying to change from the current carrier sense time to the second carrier sense time, at least the accumulated time counted by the radio wave transmission time counting means is used. And, to satisfy the radio wave transmission conditions registered in the radio wave transmission condition registering means and thereby functions as an originating control means for controlling the radio transmission by the radio transmitting apparatus.

  The wireless transmission method of the third aspect of the present invention is (1) the upper limit of the accumulated time for transmitting radio waves per predetermined time is set as the longest transmission time, and the longest transmission time depends on the carrier sense time per carrier sense. In a wireless transmission method in a wireless transmission device adopting a carrier sense system for a predetermined time, (2) radio wave transmission time counting means, radio wave transmission condition registering means, and transmission control means, and (3) radio wave transmission time clocking means Counts the cumulative time that the wireless transmission device has made a radio wave transmission from the present time to a predetermined time before, and (4) the radio wave transmission condition registration means sets the longest transmission time corresponding to each carrier sense time. (5) The transmission control means determines the carrier sense time in the wireless transmission device from the first carrier sense time to the second carrier sense time. When trying to change to the time, the radio transmission is performed so as to satisfy the radio wave transmission condition registered in the radio wave transmission condition registration unit using at least the accumulated time counted by the radio wave transmission time counting unit. Controlling radio wave transmission by the device.

  According to the present invention, even if the carrier sense time is changed in a wireless transmission device in which the accumulated time for transmitting radio waves per predetermined time is limited to a condition corresponding to the carrier sense time, the condition is observed. be able to.

Embodiment of (A) Hereinafter, an embodiment of a wireless transmission device, a program and a method according to the present invention will be described in detail with reference to the drawings.

(A-1) Configuration of First Embodiment FIG. 1 is a block diagram showing an overall configuration of a wireless communication system 1 according to this embodiment.

  The wireless communication system 1 includes a wireless transmission device 10 and a wireless reception device 20. Since the existing communication device or the like can be applied as the wireless reception device 20, detailed description is omitted.

  In the wireless communication system 1, radio transmission is performed by transmitting a radio wave from the wireless transmission device 10 and the wireless reception device 20 receives the data. In FIG. 1, for simplicity of explanation, the wireless reception device 20 has a single configuration, but a plurality of wireless reception devices 20 may be provided, and the number of the wireless reception devices 20 is not limited. The wireless transmission device 10 may be applied to wireless transmission in, for example, a wireless communication device in a low-power wireless system described in Non-Patent Document 1, but the wireless communication device to be applied is not limited.

  In the wireless transmission device 10, the radio wave transmission time per predetermined time is limited to a predetermined condition by the carrier sense time. In this embodiment, as an example, the wireless transmission device 10 is mounted on a wireless communication device in the low-power wireless system described in Non-Patent Document 1, and carrier transmission time and radio wave transmission allowed per predetermined time As for the relationship of time, the above conditions 1 to 3 are applied. In this embodiment, the predetermined time is described as one hour, but is not limited to this.

  The wireless transmission device 10 includes a carrier sense time changeable determination unit 101, a control unit 102, a radio wave transmission time control unit 103, a radio communication unit 104, and a radio wave transmission condition table 105. The wireless transmission device 10 has a program execution configuration such as a CPU, ROM, RAM, EEPROM, and hard disk, and a device having an interface for wireless communication (not limited to one device, so that a plurality of devices can be distributedly processed). It is constructed by installing the wireless transmission program of the embodiment, etc., and can be functionally shown as in FIG. 1 described above.

  The radio wave transmission condition table 105 is a table in which the wireless transmission device 10 registers conditions relating to the radio wave transmission time corresponding to the carrier sense time.

  FIG. 2 is an explanatory diagram showing an example of conditions registered in the radio wave transmission condition table 105.

  In this embodiment, as shown in FIG. 2, the radio wave transmission condition table 105 will be described assuming that the above three conditions 1 to 3 are registered in a table format. The contents of are not limited to the contents of FIG. The contents of the conditions registered in the radio wave transmission condition table 105 may be set in advance, or may be changed according to the operation of the user of the wireless transmission device 10. Is not limited.

  The wireless communication unit 104 transmits data and a carrier sense wireless signal to the wireless reception device 20. In addition, in the case of radio wave transmission by the wireless communication unit 104, the carrier sense time is changed by the control of the control unit 102, and the radio wave transmission time per predetermined time (one hour) is less than the longest transmission time by the control of the radio wave transmission time control unit 103. Limited.

  The control unit 102 has a function of controlling the overall operation of the wireless transmission device 10 and controls radio wave transmission by the radio communication unit 104 so as to comply with the conditions registered in the radio wave transmission condition table 105.

  When a request for changing the carrier sense time is generated in the wireless transmission device 10, the control unit 102 inquires the carrier sense time changeable determination unit 101 about whether or not the carrier sense time can be changed, and returns a response that the carrier sense time can be changed. If there is, the carrier sense time of the wireless communication unit 104 is changed, and the longest transmission time corresponding to the new carrier sense time is notified to the radio wave transmission time control unit 103. In addition, when there is a reply from the carrier sense time changeable determination unit 101 that the carrier sense time cannot be changed, the control unit 102 can change the carrier sense time changeable determination unit 101 thereafter. The control related to the change in the carrier sense time is performed at the timing when the notification that the change is possible is received.

  In the wireless transmission device 10, the timing at which the carrier sense time change request is generated may be, for example, a timing according to the user's operation, or the carrier sense time is controlled to be long when a large amount of data transmission occurs. Alternatively, the carrier sense time may be changed according to the time zone. Thus, in the wireless transmission device 10, the timing for changing the carrier sense time is not limited.

  The radio wave transmission time control unit 103 has a function of controlling the radio wave transmission time by the wireless communication unit 104 per predetermined time (one hour) under the control of the control unit 102.

  The radio wave transmission time control unit 103 monitors the radio wave transmission status of the wireless communication unit 104 and controls the radio wave transmission time. The radio wave transmission time control unit 103 holds a history of the time of radio wave transmission in the past predetermined time (1 hour), calculates and holds the cumulative total of radio wave transmissions in the past predetermined time (1 hour). Yes. In this embodiment, the radio wave transmission time control unit 103 keeps a history of data transmission times in the past predetermined time (one hour), that is, one hour before the present time, and counts the total. Shall. The radio wave transmission time control unit 103 controls radio wave transmission of the wireless communication unit 104 so that the timed radio wave transmission time does not exceed the longest transmission time corresponding to the currently set carrier sense time.

  The radio wave transmission time control unit 103 controls the radio wave transmission time by the wireless communication unit 104 per predetermined time (one hour), for example, simply according to the data transmission request generated in the wireless transmission device 10, Transmission of radio waves by the wireless communication unit 104 may be permitted, and transmission of radio waves by the wireless communication unit 104 may be prohibited when the measured radio wave transmission time exceeds the longest transmission time. For example, if the longest transmission time is 360 seconds per hour, the radio wave transmission time control unit 103 repeatedly permits the one-second radio wave transmission and prohibits the nine-second radio wave transmission. You may make it comply. As described above, the method of controlling the radio wave transmission time by the wireless communication unit 104 per predetermined time (one hour) by the radio wave transmission time control unit 103 is not limited.

  The carrier sense time changeable determination unit 101 has a function of notifying the control unit 102 whether or not the carrier sense time can be changed. When the carrier sense time changeable determination unit 101 receives an inquiry from the control unit 102 regarding whether or not the carrier sense time can be changed, the inquiry from the control unit 102 is made based on the time measured by the transmission time measuring unit 105. Even if the carrier sense time is changed as described above, it is determined whether or not the conditions of the radio wave transmission condition table 105 can be observed, and the determination result is returned to the control unit 102. If the carrier sense time changeable determination unit 101 cannot change the carrier sense time as a result of the determination, the carrier sense time changeable determination unit 101 notifies the control unit 102 that the carrier sense time can be changed at a timing when the change can be made thereafter. .

(A-2) Operation | movement of embodiment Next, operation | movement (radio transmission method of embodiment) of the radio | wireless communications system 1 of this embodiment which has the above structures is demonstrated.

(A-2-1) When the carrier sense time can be changed immediately First, when there is a request to change the carrier sense time, even if the carrier sense time is changed immediately in the wireless transmission device 10, An operation when the conditions registered in the radio wave transmission condition table 105 can be satisfied will be described.

  FIG. 3 is a timing chart illustrating an operation in the wireless transmission device 10 when the carrier sense time can be changed immediately.

  In FIG. 3, it is assumed that at time T11, the wireless transmission device 10 has requested to change the carrier sense time from 128 microseconds to 10 milliseconds. When there is a request to change the carrier sense time, the control unit 102 inquires the carrier sense time changeable determination unit 101 about whether or not the carrier sense time can be changed. When there is an inquiry about whether or not the carrier sense time can be changed, the carrier sense time changeable determination unit 101 makes an inquiry to the radio wave transmission time control unit 103 about the total radio wave transmission time up to one hour ago (at time T10). Here, assuming that the accumulated radio wave transmission time is 350 seconds, the carrier sense time changeable determination unit 101 determines that the total radio wave transmission time up to one hour ago (at time T10) is 128 microseconds. Since it is equal to or shorter than the longest transmission time (360 seconds) corresponding to the carrier sense time, the controller 102 is notified that the carrier sense time is possible.

  When notified that the carrier sense time is possible, the control unit 102 controls the wireless communication unit 104 to change the carrier sense time from 128 microseconds to 10 milliseconds. Further, the control unit 102, for one hour from T11 to T12, out of the longest transmission time corresponding to the carrier sense time before the change (128 microseconds) and the carrier sense time after the change (10 milliseconds), respectively, The stricter one (shorter one) is applied to the radio wave transmission time control unit 103. In FIG. 3, since the longest transmission time corresponding to the carrier sense time of 128 microseconds is 360 seconds and the longest transmission time corresponding to 10 milliseconds is unlimited, the longest transmission time of 360 seconds is 1 from T11 to T12. It will be applied to the radio wave transmission time control unit 103 during the time. Then, at time T12, the control unit 102 applies the unlimited longest transmission time set in the radio wave transmission time control unit 103 as the longest transmission time corresponding to the carrier sense time of 10 milliseconds, that is, the longest transmission time. .

(A-2-1) When the carrier sense time cannot be immediately changed Next, when there is a request for changing the carrier sense time, the wireless transmission device 10 immediately changes the carrier sense time. The operation when the conditions registered in the radio wave transmission condition table 105 are not satisfied will be described.

  FIG. 4 is a timing chart explaining the operation in the wireless transmission device 10 when the carrier sense time cannot be changed immediately.

  In FIG. 4, it is assumed that at time T22, the wireless transmission device 10 has requested to change the carrier sense time from 10 microseconds to 128 microseconds. When there is a request to change the carrier sense time, the control unit 102 inquires the carrier sense time changeable determination unit 101 about whether or not the carrier sense time can be changed. When there is an inquiry about whether or not the carrier sense time can be changed, the carrier sense time changeable determination unit 101 makes an inquiry to the radio wave transmission time control unit 103 about the total radio wave transmission time up to one hour ago (at time T20). Here, assuming that the total radio wave transmission time is 400 seconds, the carrier sense time changeable determination unit 101 determines that the total radio wave transmission time up to one hour ago (at time T20) is the carrier after the change. Since it is longer than the longest transmission time (360 seconds) corresponding to the sense time of 128 microseconds, the control unit 102 is notified that the carrier sense time cannot be changed.

  When notified that the carrier sense time cannot be changed, the control unit 102 waits until the radio wave transmission time control unit 103 notifies the carrier sense time changeable determination unit 101 that the carrier sense time can be changed. To do.

  Then, in the wireless transmission device 10, assuming that the total radio wave transmission time from T21 to T22 is 100 seconds and the total radio wave transmission time from T22 to T23 is 260 seconds, T21 to T23. The cumulative total of 1-hour radio wave transmission time is 360 seconds, which is less than the longest transmission time (360 seconds) corresponding to the changed carrier sense time of 128 microseconds. The time changeable determination unit 101 notifies the control unit 102 that the carrier sense time can be changed.

  When notified that the carrier sense time is possible, the control unit 102 controls the wireless communication unit 104 to change the carrier sense time from 10 milliseconds to 128 microseconds. Further, the control unit 102, for one hour from T23 to T24, out of the longest transmission time corresponding to the carrier sense time before change (10 milliseconds) and the carrier sense time after change (128 microseconds), respectively, The stricter one (shorter one) is applied to the radio wave transmission time control unit 103. In FIG. 4, since the longest transmission time corresponding to the carrier sense time of 128 microseconds is 360 seconds and the longest transmission time corresponding to 10 milliseconds is unlimited, the maximum transmission time of 360 seconds is 1 from T23 to T24. It will be applied to the radio wave transmission time control unit 103 during the time.

  Also, after T24, the longest transmission time (360 seconds) corresponding to the changed carrier sense time of 128 microseconds is applied to the radio wave transmission time control unit 103.

(A-3) Effects of Embodiment According to this embodiment, the following effects can be achieved.

  In the wireless transmission device 10, the radio wave transmission time control unit 103 measures the radio wave transmission time of the past predetermined time (1 hour), and refers to the measured radio wave transmission time, thereby setting the carrier sense time during data transmission. Even if it is changed, radio wave transmission by the wireless communication unit 104 can be controlled so as to satisfy the conditions of the radio wave transmission condition table 105.

  Further, in the wireless transmission device 10, the radio wave transmission time control unit 103 refers to the radio wave transmission time, and the carrier sense time changeable determination unit 101 determines whether the carrier sense time can be changed. Even if the carrier sense time is changed early without waiting for the elapse of a predetermined time (1 hour) after a request to change the sense time, the wireless communication unit 104 satisfies the condition of the radio wave transmission condition table 105. Radio wave transmission can be controlled.

  Further, in the wireless transmission device 10, after changing the carrier sense time, during the predetermined time (1 hour), the stricter one of the longest transmission times corresponding to the carrier sense time before change and the carrier sense time after change respectively ( The shorter one is applied to the radio wave transmission time control unit 103 (for example, between T11 and T12 in FIG. 3). Thereby, even after the carrier sense time is changed, radio wave transmission by the wireless communication unit 104 can be controlled so as to satisfy the conditions of the radio wave transmission condition table 105.

(C) Other Embodiments The present invention is not limited to the above-described embodiment, and may include modified embodiments as exemplified below.

(C-1) In the above embodiment, in the wireless transmission device 10, after changing the carrier sense time, the predetermined time (1 hour) corresponds to the carrier sense time before the change and the carrier sense time after the change, respectively. Of the longest transmission time to be transmitted, the stricter one (shorter one) is applied to the radio wave transmission time control unit 103, but the applied time is not after changing the carrier sense time but before changing the carrier sense time. You may make it count from. For example, in FIG. 3 described above, of the longest transmission times corresponding to the carrier sense time before the change and the carrier sense time after the change, the stricter (shorter) is determined from the time T11 when the carrier sense time is changed. Although applied to the radio wave transmission time control unit 103 for a predetermined time (1 hour), the radio wave transmission time control unit 103 may be started from the time when the radio wave transmission was ended last before T11. Thereby, in the wireless transmission device 10, since the longest transmission time corresponding to the changed carrier sense time can be applied to the time before T12 in FIG. 3 described above, a large amount of data is transmitted early. There are cases where it is possible. Moreover, in the wireless transmission device 10, the time for measuring the radio wave transmission time measurement can be shortened.

(C-2) In the above embodiment, the calculation of the accumulated radio wave transmission time of the past predetermined time (1 hour) by the radio wave transmission time control unit 103 is described as being performed continuously. For example, it may be applied discretely such as every 5 minutes. Thereby, in the wireless transmission device 10, it is possible to reduce the processing amount related to communication control.

(C-3) In the above embodiment, if the wireless transmission device 10 immediately changes the carrier sense time, the condition registered in the radio wave transmission condition table 105 cannot be satisfied (see FIG. 4 described above). For the reference), when the condition is satisfied, that is, when the accumulated radio wave transmission time up to a predetermined time (one hour) is larger than the longest transmission time after the change of the carrier sense time, the predetermined time (1 Wait until the total of the radio wave transmission time until the time is less than or equal to the longest transmission time. In addition to waiting, the radio wave transmission time control unit 103 is controlled to suppress the time for radio wave transmission. May be. For example, in FIG. 4 described above, during the period from T22 to T23, the radio wave transmission time control unit 103 is controlled to set the longest transmission time to the longest transmission time (128 microseconds) corresponding to the changed carrier sense time (128 microseconds). 360 seconds) or less, or prohibition of radio wave transmission.

It is a block diagram which shows the whole structure of the radio | wireless communications system which concerns on embodiment. It is explanatory drawing shown about the example of the content of the electromagnetic wave transmission condition table which concerns on embodiment. 6 is a timing chart illustrating an example of an operation when the carrier sense time can be changed immediately in the wireless transmission device according to the embodiment. 5 is a timing chart illustrating an example of an operation when the carrier sense time cannot be changed immediately in the wireless transmission device according to the embodiment. It is a timing chart explaining control of carrier sense time and electric wave dispatch time in the conventional communication apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Wireless communication system, 10 ... Wireless transmission apparatus, 101 ... Carrier sense time changeable determination part, 102 ... Control part, 103 ... Radio wave transmission time control part, 104 ... Radio communication part, 105 ... Radio wave transmission condition table, 20 ... Wireless receiver.

Claims (8)

In a radio transmission apparatus adopting a carrier sense method in which the upper limit of the accumulated time for transmitting radio waves per predetermined time is the longest transmission time, and the longest transmission time is a time corresponding to the carrier sense time per carrier sense. ,
A radio wave transmission time counting means for counting a cumulative time during which the wireless transmission device has transmitted a radio wave between a current time and a predetermined time before;
Radio wave transmission condition registration means for registering radio wave transmission conditions related to the longest transmission time corresponding to each carrier sense time;
When trying to change the carrier sense time in the wireless transmission device from the first carrier sense time to the second carrier sense time, at least using the time counted by the radio wave transmission time counting means, A radio transmission device comprising: a transmission control unit that controls radio wave transmission by the radio transmission device so that the radio wave transmission condition registered in the radio wave transmission condition registration unit is satisfied. The radio wave transmission condition registration means registers the longest transmission time corresponding to each carrier sense time,
The said transmission control means changes the carrier sense time in the said radio | wireless transmitter to the said 2nd carrier sense time, only when it is below the longest transmission time corresponding to the said 2nd carrier sense time. The wireless transmission device according to claim 1.   In the carrier sense time changing means, when changing from the first carrier sense time to the second carrier sense time, the time measured by the radio wave transmission time measuring means is the second carrier sense time. If the accumulated time counted by the radio wave transmission time counting means becomes equal to or shorter than the longest transmission time corresponding to the second carrier sense time, the wireless transmission device The radio transmission apparatus according to claim 2, wherein the carrier sense time in is changed to the second carrier sense time.   When the carrier sense time changing unit changes the carrier sense time in the wireless transmission device from the first carrier sense time to the second carrier sense time, a predetermined time elapses from the start of radio wave transmission adjustment. Radio wave transmission control means for applying a shorter one of the longest transmission time corresponding to the first carrier sense time and the longest transmission time corresponding to the second carrier sense time to the wireless transmission device The wireless transmission device according to claim 2, further comprising:   The radio wave transmission adjustment start time is a time when the carrier sense time changing means changes the carrier sense time in the wireless transmission device from the first carrier sense time to the second carrier sense time. The wireless transmission device according to claim 4.   The radio wave transmission adjustment start time is finally transmitted before the carrier sense time changing means changes the carrier sense time of the wireless transmission device from the first carrier sense time to the second carrier sense time. The wireless transmission device according to claim 4, wherein A radio transmission apparatus adopting a carrier sense method in which the upper limit of the accumulated time for transmitting radio waves per predetermined time is the longest transmission time, and the longest transmission time is a time corresponding to the carrier sense time per carrier sense. Install the computer
A radio wave transmission time counting means for counting a cumulative time during which the wireless transmission device has transmitted a radio wave between a current time and a predetermined time before;
Radio wave transmission condition registration means for registering radio wave transmission conditions related to the longest transmission time corresponding to each carrier sense time;
When trying to change the carrier sense time in the wireless transmission device from the first carrier sense time to the second carrier sense time, at least using the accumulated time measured by the radio wave transmission time counting means, A radio transmission program that functions as a transmission control unit that controls radio wave transmission by the wireless transmission device so as to satisfy the radio wave transmission condition registered in the radio wave transmission condition registration unit. In a radio transmission apparatus employing a carrier sense method in which the upper limit of the accumulated time for transmitting radio waves per predetermined time is the longest transmission time, and the longest transmission time is a time corresponding to the carrier sense time per carrier sense. In the wireless transmission method,
It has radio wave transmission time counting means, radio wave transmission condition registration means, transmission control means,
The radio wave transmission time counting means counts the accumulated time that the wireless transmission device has transmitted radio waves between the present time and a predetermined time before,
The radio wave transmission condition registration means registers radio wave transmission conditions related to the longest transmission time corresponding to each carrier sense time,
The transmission control means is a cumulative total measured by at least the radio wave transmission time counting means when attempting to change the carrier sense time in the wireless transmission device from the first carrier sense time to the second carrier sense time. A radio transmission method characterized by using the time to control radio wave transmission by the radio transmission device so as to satisfy the radio wave transmission condition registered in the radio wave transmission condition registration means.

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