JP2018014668A - Communication device, communication method, and computer program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save power of a communication device when the communication device is scheduled for transmission of data.SOLUTION: A communication device includes: an RF unit for transmitting and receiving RF signals through an RF channel via an antenna; a transmission schedule timing determination unit for determining transmission schedule timing of the RF signals; and a power supply control unit for stopping power supply to the RF unit for at least a partial period of a waiting period until the transmission schedule timing.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a communication device, a communication method, and a computer program.

  Conventionally, for example, the IEEE802.11 series is known as a wireless LAN (Local Area Network) communication standard. As an IEEE802.11 series wireless LAN communication device, there is known a communication device that enters a sleep state only when a transmission buffer is empty (see, for example, Non-Patent Document 1).

Hsiang-Ho Lin; Hung-Yu Wei; Rath Vannithamby, “DeepSleep: IEEE 802.11 enhancement for energy-harvesting Machine-to-Machine communications,” IEEE Global Communications Conference (GLOBECOM), 2012.

  In the above-described conventional technology, the communication device enters a sleep state only when the transmission buffer is empty (that is, only when there is no data transmission plan), but is in an awake state at other times. When the communication device is in an awake state, there is a possibility of wasting power.

  The present invention has been made in view of such circumstances, and a communication device, a communication method, and a computer program capable of saving power of the communication device when data of the communication device is scheduled to be transmitted It is an issue to provide.

(1) According to one aspect of the present invention, an RF unit that transmits and receives an RF (Radio Frequency) signal through an antenna via an RF channel, a transmission schedule timing determination unit that determines a transmission schedule timing of the RF signal, and the transmission schedule The communication apparatus includes a power supply control unit that stops power supply to the RF unit during at least a part of the standby period until the timing.
(2) One aspect of the present invention is the communication device according to (1), further including a carrier sense unit that checks the vacancy of the RF channel based on an RF signal received by the RF unit through the RF channel, The power supply control unit is a communication device that supplies power to the RF unit during the standby period for at least a first period during which the carrier sense unit checks the availability of the RF channel.
(3) According to one aspect of the present invention, in the communication device according to (2), the power supply control unit performs power supply to the RF unit in the standby period a plurality of times in the first period. It is a communication device.
(4) According to one aspect of the present invention, in the communication device according to any one of (2) and (3), the power supply control unit is connected to the RF unit at least at the first period at the end of the standby period. When power is supplied and the RF unit determines that the RF channel is free in the first period at the end of the standby period, the RF signal is transmitted at the scheduled transmission timing. On the other hand, when the carrier sense unit determines that the RF channel is not free in the first period at the end of the standby period, the RF signal is transmitted at the scheduled transmission timing. Is a communication device that does not transmit over the RF channel.
(5) According to one aspect of the present invention, in the communication device according to any one of (1) to (4) above, the other communication terminal transmits the RF channel based on an RF signal received by the RF unit through the RF channel. Further comprising a header analysis unit that analyzes the header of the packet transmitted by the power supply control unit, based on the packet length of the packet of the analysis result of the header analysis unit, of the waiting period until the scheduled transmission timing, In the communication apparatus, power supply to the RF unit is stopped during at least a part of a period from the start of reception of the packet to the end of reception of the packet.

(6) According to one aspect of the present invention, an RF unit that transmits and receives an RF (Radio Frequency) signal via an antenna via an RF channel, a transmission schedule timing determination unit that determines a transmission schedule timing of the RF signal, and the RF unit Based on the RF signal received by the RF channel, based on the header analysis unit that analyzes the header of the packet transmitted by the other communication terminal through the RF channel, and the packet length of the packet of the analysis result of the header analysis unit In the standby period until the scheduled transmission timing, power control for stopping power supply to the RF unit during at least a part of the period from the start of reception of the packet to the end of reception of the packet A communication device.

(7) One aspect of the present invention is a communication method for a communication apparatus including an RF unit that transmits and receives an RF (Radio Frequency) signal via an antenna via an RF channel, and the communication apparatus plans to transmit the RF signal. A scheduled transmission timing determining step for determining timing; and a power control step in which the communication apparatus stops power supply to the RF unit during at least a part of a standby period until the scheduled transmission timing. It is a communication method.

(8) One embodiment of the present invention is a communication method for a communication apparatus including an RF unit that transmits and receives an RF (Radio Frequency) signal via an antenna via an RF channel, and the communication apparatus plans to transmit the RF signal. A transmission scheduled timing determination step for determining timing, and a header for analyzing the header of a packet transmitted from another communication terminal via the RF channel by the communication device based on an RF signal received by the RF unit via the RF channel. An analysis step, and the communication device, based on the packet length of the packet of the analysis result of the header analysis step, the reception end of the packet after the start of reception of the packet in the waiting period until the scheduled transmission timing A power control step for stopping the power supply to the RF unit during at least a part of the period up to It is a communication method including the.

(9) According to one aspect of the present invention, a scheduled transmission timing is determined in a computer of a communication apparatus including an RF unit that transmits and receives an RF (Radio Frequency) signal through an antenna via an RF channel. It is a computer program for realizing a function and a power supply control function for stopping power supply to the RF unit during at least a part of the standby period until the scheduled transmission timing.

(10) According to one aspect of the present invention, a scheduled transmission timing is determined in a computer of a communication apparatus including an RF unit that transmits and receives an RF (Radio Frequency) signal via an antenna via an antenna. Based on the RF signal received by the RF unit through the RF channel, a header analysis function for analyzing a header of a packet transmitted by another communication terminal through the RF channel, and the analysis result of the header analysis function Based on the packet length of the packet, among the waiting period until the scheduled transmission timing, at least a part of the period from the start of reception of the packet to the end of reception of the packet is the power to the RF unit A computer program for realizing a power control function for stopping supply.

  According to the present invention, it is possible to save the power of the communication device when it is scheduled to transmit data.

It is a figure which shows the structural example of the communication apparatus 1 which concerns on one Embodiment. It is explanatory drawing of the example 1 of the communication method which concerns on one Embodiment. It is explanatory drawing of the example of a stop of the electric power supply which concerns on one Embodiment. It is explanatory drawing of Example 2 of the communication method which concerns on one Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, an IEEE 802.11 series wireless LAN will be described as an example of a wireless communication network.

  FIG. 1 is a diagram illustrating a configuration example of a communication device 1 according to an embodiment. The communication apparatus 1 is an IEEE 802.11 series wireless LAN communication apparatus. For example, the communication device 1 is an IEEE 802.11 series wireless LAN terminal device. The communication device 1 is a communication device having a function of a wireless LAN terminal device of the IEEE 802.11 series, and may be a mobile communication terminal device such as a smartphone or a tablet computer (tablet PC), or It may be a stationary communication terminal device (for example, a stationary personal computer, a server computer, a home gateway, etc.).

  In FIG. 1, the communication device 1 includes an antenna 11, an RF (Radio Frequency) unit 12, a baseband unit 14, an application unit 16, a scheduled transmission timing determination unit 17, and a power supply 18. And a power supply control unit 19.

  The RF unit 12 transmits and receives an RF signal via an antenna 11 through an RF (radio frequency) channel. The RF unit 12 modulates the baseband signal input from the baseband unit 14 into an RF signal, and transmits the RF signal through the antenna 11. The RF unit 12 demodulates the RF signal received by the antenna 11 into a baseband signal, and outputs the baseband signal to the baseband unit 14. The RF unit 12 includes an amplifier, a filter, a quadrature modulator, a quadrature demodulator, and the like.

  The RF unit 12 includes a carrier sense unit 13. The carrier sense unit 13 checks the vacancy of the RF channel based on the RF signal received by the RF unit 12 through the RF channel (performs carrier sense). The carrier sense unit 13 determines whether the RF channel is free (idle state) or whether the RF channel is not free (busy state).

  The baseband unit 14 performs various processes in the baseband. The baseband unit 14 generates a baseband signal from the transmission data signal input from the application unit 16 and outputs the baseband signal to the RF unit 12. Further, the baseband unit 14 generates a reception data signal from the baseband signal input from the RF unit 12 and outputs the reception data signal to the application unit 16. The baseband unit 14 includes, for example, a digital-analog (DA) converter, an analog-digital (AD) converter, and an arithmetic processing device such as a memory and a digital signal processor (DSP). And the function of the baseband unit 14 is realized by digital signal processing.

  The baseband unit 14 includes a header analysis unit 15. Based on the baseband signal input from the RF unit 12, the header analysis unit 15 analyzes the header of a packet transmitted from another communication terminal through the RF channel. The header of the packet includes information indicating the length (packet length) of the packet.

  The application unit 16 outputs a data signal (transmission data signal) transmitted by the application to the baseband unit 14. The application unit 16 receives and processes the reception data signal input from the baseband unit 14 by an application.

  The scheduled transmission timing determining unit 17 determines the scheduled transmission timing of the RF signal. The power source 18 supplies power to each unit of the communication device 1. The power control unit 19 controls power supply by the power source 18. The power supply control unit 19 stops power supply to the RF unit 12 during at least a part of the standby period until the scheduled transmission timing determined by the scheduled transmission timing determination unit 17.

  Next, an example of the operation of the communication method and the communication device 1 according to the present embodiment will be described.

(Example 1 of communication method)
FIG. 2 is an explanatory diagram of Example 1 of the communication method according to the present embodiment. FIG. 2 shows one RF channel among the RF channels that can be used by the communication apparatus 1. Hereinafter, with reference to FIG. 2, the example 1 of the communication method which concerns on this embodiment, and the operation example of the communication apparatus 1 are demonstrated. Here, one RF channel shown in FIG. 2 will be described, but the present invention can be similarly applied to other RF channels. In the following description, the slot time is a time corresponding to one slot. One slot has a time length corresponding to the preamble length of the PHY (physical) layer. For example, in the case of the IEEE802.11a1 communication standard, the short preamble length of the PHY (physical) layer is 8 us (microseconds), and the time length of one slot is 9 us.

(Step S1) The carrier sense unit 13 of the communication device 1 checks the vacancy of the RF channel. As a result, in the example of FIG. 2, the RF channel that was busy is no longer busy at slot time Ta. The carrier sense unit 13 notifies the scheduled transmission timing determination unit 17 that the RF channel that was busy is no longer busy at the slot time Ta.

(Step S2) The scheduled transmission timing determination unit 17 of the communication device 1 determines the scheduled transmission timing, which is the timing at which the RF signal is scheduled to be transmitted through the RF channel. The scheduled transmission timing is a slot represented by the following equation based on the slot time Ta when the RF channel that was busy is no longer busy, the DIFS (Distributed Inter Frame Space) time, and the backoff time r. It is determined at time Tss.
Slot time Tss = time Ta + DIFS time + backoff time r
The DIFS time is a time defined in the IEEE 802.11 series communication standard. The back-off time r is randomly selected from a time range defined by the IEEE 802.11 series communication standard. From the above equation, the scheduled transmission timing is determined at the slot time Tss when the total time of the DIFS time and the back-off time r has elapsed from the slot time Ta.

  The scheduled transmission timing determination unit 17 randomly selects the back-off time r from the time range defined by the IEEE 802.11 series communication standard. The scheduled transmission timing determination unit 17 determines the time Tss when the total time of the DIFS time and the backoff time r has elapsed from the slot time Ta notified from the carrier sense unit 13 as the scheduled transmission timing. The scheduled transmission timing determination unit 17 notifies the baseband unit 14 and the power supply control unit 19 of the determined transmission scheduled timing slot time Tss.

(Step S3) The power supply control unit 19 of the communication device 1 supplies power to the RF unit 12 during at least a part of the standby period until the slot time Tss of the scheduled transmission timing notified from the scheduled transmission timing determining unit 17. Stop supplying.

(Example of stopping power supply)
Here, an example of stopping the power supply to the RF unit 12 will be described. FIG. 3 is an explanatory diagram of an example of stopping power supply according to the present embodiment. In the example of FIG. 3, the power supply control unit 19 turns on (power is supplied) and turns off (does not supply power) the RF unit 12 in the standby period until the slot time Tss of the scheduled transmission timing after the slot time Ta. ) And repeat alternately. The length of the power supply on-continuation period (power supply on-duration period) may be the same as or different from the length of the power supply off-continuation period (power supply off-duration period). Also good. Further, the length of the power supply ON duration may be one slot or may be a plurality of slots. Further, the length of the power supply off duration may be one slot or a plurality of slots.

  Further, the length of the power supply ON continuation period may be equal to or longer than the minimum length (first period) for the carrier sense unit 13 to check for an empty RF channel (execute carrier sense). As a result, the carrier sense unit 13 can check the vacancy of the RF channel (execute carrier sense) in one power supply ON duration.

  Further, as illustrated in FIG. 3, the power supply control unit 19 supplies power to the RF unit 12 at least in the first period at the end of the waiting period until the slot time Tss of the scheduled transmission timing after the slot time Ta. You may go. As a result, the carrier sense unit 13 can check the vacancy of the RF channel (execute carrier sense (CS)) immediately before the slot time Tss of the scheduled transmission timing.

In the example of FIG. 3 described above, the power supply to the RF unit 12 is alternately turned on and off alternately in the standby period until the slot time Tss of the scheduled transmission timing after the slot time Ta, but this is not limitative. Instead, the power supply to the RF unit 12 may be stopped during at least a part of the standby period. For example, the power supply to the RF unit 12 may be stopped during the entire standby period. Further, for example, power supply to the RF unit 12 may be performed only in the last one slot of the standby period, and power supply to the RF unit 12 may be stopped in a period other than the last one slot in the standby period. At least immediately before the slot time Tss of the scheduled transmission timing, the vacancy of the RF channel is checked (carrier sense is executed) by supplying power to the RF unit 12 at least in the last slot of the standby period. Can do.
The above is an explanation of an example of stopping power supply to the RF unit 12.

(Step S4) The baseband unit 14 of the communication device 1 starts packet transmission processing when the slot time Tss of the scheduled transmission timing is reached. The packet is a packet input from the application unit 16 and stored in the transmission buffer in the baseband unit 14. When the baseband unit 14 starts the packet transmission process, the baseband unit 14 generates a baseband signal of the packet and inputs it to the RF unit 12. Then, the RF unit 12 modulates the baseband signal of the packet input from the baseband unit 14 into an RF signal, and transmits the RF signal through the antenna 11. Thereby, transmission of the RF signal of the packet is started by the RF channel from the slot time Tss at the scheduled transmission timing.

  Note that the baseband unit 14 determines the scheduled transmission timing when the carrier sense unit 13 determines that the RF channel is busy during the standby period from the scheduled transmission timing to the slot time Tss after the slot time Ta. The slot time Tss may be canceled. By canceling the slot time Tss at the scheduled transmission timing, the transmission processing of the packet scheduled to start at the slot time Tss at the scheduled transmission timing is stopped.

  For example, as shown in FIG. 3, at the end of the waiting period until the slot time Tss of the scheduled transmission timing after the slot time Ta, carrier sense (CS) is executed by the carrier sense unit 13 and the RF channel is busy. If it is determined that there is, the baseband unit 14 cancels the slot time Tss at the scheduled transmission timing. As a result, the transmission process of the packet scheduled to start at the slot time Tss at the scheduled transmission timing is stopped, and therefore the RF unit 12 does not transmit the RF signal through the RF channel even at the slot time Tss at the scheduled transmission timing. The occurrence of collision of RF signals in the RF channel can be avoided.

  According to the communication method example 1 described above, the power supply to the RF unit 12 is stopped during at least a part of the standby period until the slot time Tss at the scheduled transmission timing. Thereby, it is possible to save the power supply 18 of the communication apparatus 1 when the communication apparatus 1 is scheduled to transmit data.

  In addition, in the standby period until the slot time Tss of the scheduled transmission timing, the length of the power supply ON continuation period is the minimum length (first period) for checking the vacancy of the RF channel (executing carrier sense) By doing so, it is possible to check the vacancy of the RF channel (perform carrier sense) in one power supply ON continuation period. Thereby, in the standby period until the slot time Tss at the scheduled transmission timing, the power supply to the RF unit 12 is stopped to save the power supply 18 and carrier sense can be executed. If it is detected by this carrier sense that the RF channel has changed to a busy state, the occurrence of collision of RF signals in the RF channel can be avoided by canceling the slot time Tss at the scheduled transmission timing.

Further, in the standby period until the slot time Tss at the scheduled transmission timing, power is supplied to the RF unit 12 in at least the last slot, so that at least immediately before the slot time Tss at the scheduled transmission timing, the RF channel is free. Can be checked (perform carrier sense). Thereby, it is possible to more reliably avoid the occurrence of collision of RF signals in the RF channel.
The above is the description of the communication method example 1.

(Example 2 of communication method)
FIG. 4 is an explanatory diagram of Example 2 of the communication method according to the present embodiment. FIG. 4 shows one RF channel among the RF channels that can be used by the communication apparatus 1. Hereinafter, with reference to FIG. 4, a communication method example 2 and an operation example of the communication device 1 according to the present embodiment will be described. Here, one RF channel shown in FIG. 4 will be described, but the present invention can be similarly applied to other RF channels. In the following description, the slot time and the description of the slot are the same as those of the communication method example 1 described above. Also, in FIG. 4, the same reference numerals are given to portions corresponding to the respective steps in FIG. 2, and description thereof is omitted.

  Step S1 and step S2 are the same as those of the communication method example 1 shown in FIG.

(Step S11) The header analysis unit 15 of the communication device 1 analyzes the header of a packet transmitted by another communication terminal through the RF channel based on the RF signal received by the RF unit 12 through the RF channel. The header of the packet includes information indicating the length (packet length) of the packet. The header analysis unit 15 recognizes the packet length of the packet based on information representing the packet length included in the header of the packet transmitted by another communication terminal through the RF channel. The header analysis unit 15 notifies the power control unit 19 of the packet length of the analysis result packet.

  When the packet length of the analysis result packet is notified from the header analysis unit 15, the power supply control unit 19 starts receiving the packet in the waiting period until the slot time Tss of the scheduled transmission timing based on the packet length. After that, the power supply to the RF unit 12 is stopped during at least a part of the period from the end of reception of the packet to the end of reception of the packet. The length of the power supply off duration may be one slot or may be a plurality of slots. In the example of FIG. 4, when the packet length of the analysis result packet is notified from the header analysis unit 15, the power supply control unit 19 starts from the slot time Tc immediately after the notification to the last slot time Td of the packet. The power supply to 12 is stopped.

According to the communication method example 2 described above, when a packet is transmitted from another communication apparatus through the RF channel in the standby period until the slot time Tss of the transmission scheduled timing, at least a part of the period of the packet is The power supply to the RF unit 12 is stopped. Thereby, it is possible to save the power supply 18 of the communication apparatus 1 when the communication apparatus 1 is scheduled to transmit data.
The above is the description of the communication method example 2.

  Note that the above-described communication method example 1 and communication method example 2 may be applied in combination. For example, as illustrated in FIG. 3, the power supply control unit 19 alternately turns on and off the power supply to the RF unit 12 in the standby period from the scheduled transmission timing to the slot time Tss after the slot time Ta. repeat. Then, during the power supply ON duration, the header analysis unit 15 analyzes the header of the packet transmitted by the other communication terminal through the RF channel based on the RF signal received by the RF unit 12 through the RF channel. Then, when the packet length of the analysis result packet is notified from the header analysis unit 15, the power supply control unit 19 starts from the slot time Tc immediately after the notification of the packet length of the packet as illustrated in FIG. 4, for example. The power supply to the RF unit 12 is stopped until the last slot time Td of the packet.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the specific structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

  For example, in the above-described embodiment, power supply to the RF unit 12 is stopped. However, in the communication apparatus 1, power supply to parts other than the RF unit 12 in addition to the RF unit 12 may be stopped.

  In the above-described embodiment, an IEEE 802.11 series wireless LAN has been described as an example of a wireless communication network. However, the embodiment may be applied to other wireless communication networks.

Further, a computer program for realizing the functions of the communication apparatus 1 described above may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read into a computer system and executed. . Here, the “computer system” may include an OS and hardware such as peripheral devices.
“Computer-readable recording medium” refers to a flexible disk, a magneto-optical disk, a ROM, a writable nonvolatile memory such as a flash memory, a portable medium such as a DVD (Digital Versatile Disc), and a built-in computer system. A storage device such as a hard disk.

Further, the “computer-readable recording medium” means a volatile memory (for example, DRAM (Dynamic DRAM) in a computer system that becomes a server or a client when a program is transmitted through a network such as the Internet or a communication line such as a telephone line. Random Access Memory)), etc., which hold programs for a certain period of time.
The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

DESCRIPTION OF SYMBOLS 1 ... Communication apparatus, 11 ... Antenna, 12 ... RF part, 13 ... Carrier sense part, 14 ... Baseband part, 15 ... Header analysis part, 16 ... Application part, 17 ... Transmission scheduled timing determination part, 18 ... Power supply, 19 ... Power control unit

Claims (10)

An RF unit that transmits and receives an RF (Radio Frequency) signal through an RF channel via an antenna;
A transmission schedule timing determination unit that determines a transmission schedule timing of the RF signal;
A power supply control unit that stops power supply to the RF unit during at least a part of the standby period until the scheduled transmission timing;
A communication device comprising: The RF unit further comprises a carrier sense unit that checks the vacancy of the RF channel based on an RF signal received by the RF channel,
The power supply control unit supplies power to the RF unit in the standby period for a minimum first period or longer for the carrier sense unit to check the availability of the RF channel.
The communication apparatus according to claim 1. The power supply control unit performs power supply to the RF unit in the first period a plurality of times in the standby period.
The communication apparatus according to claim 2. The power control unit supplies power to the RF unit at least in the first period at the end of the standby period,
When the RF channel is determined to be free by the carrier sense unit in the first period at the end of the standby period, the RF unit sends an RF signal to the RF channel at the scheduled transmission timing. On the other hand, when the carrier sense unit determines that the RF channel is not free in the first period at the end of the standby period, an RF signal is transmitted by the RF channel at the scheduled transmission timing. Do not send,
The communication apparatus of any one of Claim 2 or 3. Based on an RF signal received by the RF unit through the RF channel, the RF unit further includes a header analysis unit that analyzes a header of a packet transmitted by the other communication terminal through the RF channel,
The power supply control unit, based on the packet length of the packet of the analysis result of the header analysis unit, a period from the start of reception of the packet to the end of reception of the packet in the waiting period until the scheduled transmission timing Power supply to the RF unit is stopped during at least a part of the period,
The communication apparatus according to any one of claims 1 to 4. An RF unit that transmits and receives an RF (Radio Frequency) signal through an RF channel via an antenna;
A transmission schedule timing determination unit that determines a transmission schedule timing of the RF signal;
Based on the RF signal received by the RF unit through the RF channel, a header analysis unit that analyzes a header of a packet transmitted by the other communication terminal through the RF channel;
Based on the packet length of the packet of the analysis result of the header analysis unit, at least a part of the waiting period until the scheduled transmission timing from the start of reception of the packet to the end of reception of the packet A power control unit for stopping power supply to the RF unit during the period of
A communication device comprising: A communication method of a communication device including an RF unit that transmits and receives an RF (Radio Frequency) signal via an antenna via an RF channel,
The communication apparatus determines a transmission schedule timing for determining a transmission schedule timing of the RF signal;
A power control step in which the communication device stops power supply to the RF unit during at least a part of the standby period until the scheduled transmission timing;
Including a communication method. A communication method of a communication device including an RF unit that transmits and receives an RF (Radio Frequency) signal via an antenna via an RF channel,
The communication apparatus determines a transmission schedule timing for determining a transmission schedule timing of the RF signal;
A header analysis step in which the communication device analyzes a header of a packet transmitted by another communication terminal via the RF channel based on an RF signal received by the RF unit via the RF channel;
Based on the packet length of the packet of the analysis result of the header analysis step, the communication device has a period from the start of reception of the packet to the end of reception of the packet, out of the waiting period until the scheduled transmission timing. A power control step for stopping power supply to the RF unit during at least a part of the period;
Including a communication method. In a computer of a communication device including an RF unit that transmits and receives an RF (Radio Frequency) signal through an RF channel via an antenna,
A scheduled transmission timing determining function for determining a scheduled transmission timing of the RF signal;
A power supply control function for stopping power supply to the RF unit during at least a part of the waiting period until the scheduled transmission timing;
Computer program for realizing. In a computer of a communication device including an RF unit that transmits and receives an RF (Radio Frequency) signal through an RF channel via an antenna,
A scheduled transmission timing determining function for determining a scheduled transmission timing of the RF signal;
Based on the RF signal received by the RF unit through the RF channel, a header analysis function for analyzing a header of a packet transmitted by the other communication terminal through the RF channel;
Based on the packet length of the packet of the analysis result of the header analysis function, at least a part of the waiting period until the scheduled transmission timing from the start of reception of the packet to the end of reception of the packet A power supply control function for stopping the power supply to the RF unit during the period of
Computer program for realizing.

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