WO2020136877A1 - 無線通信装置、無線通信方法および無線通信プログラム - Google Patents

無線通信装置、無線通信方法および無線通信プログラム Download PDF

Info

Publication number
WO2020136877A1
WO2020136877A1 PCT/JP2018/048490 JP2018048490W WO2020136877A1 WO 2020136877 A1 WO2020136877 A1 WO 2020136877A1 JP 2018048490 W JP2018048490 W JP 2018048490W WO 2020136877 A1 WO2020136877 A1 WO 2020136877A1
Authority
WO
WIPO (PCT)
Prior art keywords
periodic
wireless communication
wireless
frame
transmission
Prior art date
Application number
PCT/JP2018/048490
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
功之郎 石原
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to DE112018008173.7T priority Critical patent/DE112018008173B4/de
Priority to JP2020562274A priority patent/JP7118171B2/ja
Priority to PCT/JP2018/048490 priority patent/WO2020136877A1/ja
Priority to CN201880100404.4A priority patent/CN113228805B/zh
Priority to KR1020217018328A priority patent/KR102372459B1/ko
Publication of WO2020136877A1 publication Critical patent/WO2020136877A1/ja

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
    • H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment collision avoidance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices

Definitions

  • the present invention relates to a technique for realizing frame transmission/reception while avoiding frame collision.
  • CSMA/CA is an abbreviation for Carrier Sense Multiple Access/Collision Avidance.
  • the radio waits for a random offset (latency) before transmitting the frame and then checks to see if another radio is transmitting the frame. The radio transmits a frame if no other frame is transmitted. If other frames are being transmitted, the radio will refrain from transmitting by setting a random offset. This avoids frame collisions.
  • Such technology is called carrier sense. This method does not require synchronization between wireless devices, and can freely transmit at the timing when a communication request is generated in the wireless device.
  • Patent Document 1 discloses the following method.
  • the wireless device monitors the transmission timing of surrounding wireless devices by using carrier sense when transmitting the notification frame. Then, the wireless device transmits the notification frame at a timing different from the timing at which the other wireless device transmits the frame. As a result, frame collision due to overlapping frame transmission timings is avoided.
  • An object of the present invention is to enable frame transmission/reception while avoiding frame collision without monitoring frame transmission timing from surrounding radios.
  • the wireless communication device of the present invention is An offset setting unit that randomly sets the offset each time the reset period for resetting the offset, which is the waiting time until the periodic transmission of the periodic frame is started, is changed, An offset waiting unit that waits for the elapse of a randomly set offset each time the reset period expires, At each expiration of the reset period, the periodic transmission control unit that stops periodic transmission of periodic frames until a randomly set offset elapses and starts periodic transmission of periodic frames after the randomly set offset elapses. And
  • the offset is randomly set every time the reset cycle expires. As a result, it becomes possible to realize periodic frame communication while avoiding collision of periodic frames without monitoring the frame transmission timing from surrounding radios.
  • FIG. 3 is a functional configuration diagram of the wireless communication device 100 according to the first embodiment.
  • FIG. 3 is a configuration diagram of a transmission timing control unit 110 according to the first embodiment.
  • FIG. 3 is a hardware configuration diagram of the wireless communication device 100 according to the first embodiment.
  • FIG. 3 is a configuration diagram of a wireless communication system 200 according to Embodiment 1.
  • FIG. 3 is a flowchart of a wireless communication method according to the first embodiment.
  • FIG. 4 is a diagram showing a specific example of the operation of the wireless communication system 200 according to the first embodiment.
  • FIG. 3 is a diagram showing the proportionality of frame collision probabilities in the first embodiment.
  • FIG. 6 is a diagram showing a specific example of a frame collision probability in the first embodiment.
  • FIG. 3 is a functional configuration diagram of a wireless communication device 100 according to Embodiment 2.
  • FIG. 7 is a flowchart of a wireless communication method according to the second embodiment.
  • 9 is a flowchart of a wireless communication method according to the third embodiment.
  • 9 is a flowchart of a wireless communication method according to the fourth embodiment.
  • 6 is a functional configuration diagram of a wireless communication device 100 according to Embodiment 5.
  • FIG. 9 is a flowchart of a wireless communication method according to the fifth embodiment.
  • 1 is a hardware configuration diagram of a wireless communication device 100 according to an embodiment.
  • Embodiment 1 A mode for preventing collision of regularly transmitted frames from continuing for a long time will be described with reference to FIGS. 1 to 8.
  • the wireless communication device 100 is also referred to as a wireless device 210.
  • the wireless communication device 100 includes a transmission timing control unit 110, a wireless communication unit 120, a recording unit 130, an application unit 141, and a data communication unit 142. Each function will be described later.
  • the configuration of the transmission timing control unit 110 will be described based on FIG.
  • the transmission timing control unit 110 includes an initialization unit 111, a resetting control unit 112, an offset setting unit 113, an offset standby unit 114, and a regular transmission control unit 115. Each function will be described later.
  • the wireless communication device 100 is a computer including hardware such as a processor 101, a memory 102, a wireless communication device 103, and a wireless antenna 104. These pieces of hardware are connected to each other via signal lines.
  • the processor 101 is an IC that performs arithmetic processing, and controls other hardware.
  • the processor 101 is a CPU.
  • IC is an abbreviation for Integrated Circuit.
  • CPU is an abbreviation for Central Processing Unit.
  • the memory 102 is a storage device and stores various data.
  • the memory 102 is ROM, RAM, HDD, SSD, or a combination thereof.
  • ROM is an abbreviation for Read Only Memory.
  • RAM is an abbreviation for Random Access Memory.
  • HDD is an abbreviation for Hard Disk Drive.
  • SSD is an abbreviation for Solid State Drive.
  • the wireless communication device 103 is a receiver and a transmitter, and transmits/receives various frames as wireless signals to/from other wireless devices via a wireless line.
  • the wireless communication device 103 is a communication chip or NIC.
  • NIC is an abbreviation for Network Interface Card.
  • the wireless antenna 104 is one or more antennas for wireless communication.
  • the wireless antenna 104 is a diversity antenna including a plurality of antennas.
  • the hardware of the processor 101, the memory 102, the wireless communication device 103, and the wireless antenna 104 realizes the transmission timing control unit 110, the wireless communication unit 120, the recording unit 130, the application unit 141, and the data communication unit 142 (FIG. 1). reference).
  • the transmission timing control unit 110 is mainly realized by the processor 101 and the memory 102.
  • the wireless communication unit 120 is mainly realized by the processor 101, the wireless communication device 103, and the wireless antenna 104.
  • the recording unit 130 is mainly realized by the processor 101 and the memory 102.
  • the application unit 141 and the data communication unit 142 are mainly realized by the processor 101 and the memory 102.
  • OS is an abbreviation for Operating System.
  • the wireless communication program is a program for causing a computer to function as the transmission timing control unit 110, the wireless communication unit 120, the recording unit 130, the application unit 141, and the data communication unit 142.
  • the wireless communication program can be computer-readable recorded (stored) in a nonvolatile recording medium such as an optical disk or a flash memory.
  • the wireless communication device 100 may include a plurality of processors that replace the processor 101.
  • the plurality of processors share the role of the processor 101.
  • the wireless communication device 100 may further include an interface for communicating with an external device.
  • the wireless communication device 100 may include a USB interface and a UAT interface.
  • USB is an abbreviation for Universal Serial Bus.
  • UAT is an abbreviation for Universal Asynchronous Receiver Transmitter.
  • the configuration of the wireless communication system 200 will be described with reference to FIG.
  • the wireless communication system 200 is a specific example of a system (wireless communication system) including the wireless communication device 100.
  • the wireless communication system 200 includes three wireless devices (211A to 211C) and one wireless device 212. However, the wireless communication system 200 may include two or more wireless devices 212. When each of the plurality of wireless devices (211A to 211C) is not specified, each is referred to as a wireless device 211. The number of wireless devices 211 may be two. Further, the number of wireless devices 211 may be four or more.
  • Each of the wireless device 211 and the wireless device 212 is an example of the wireless device 210.
  • Each wireless device 211 periodically transmits a periodic frame to the wireless device 212.
  • the wireless devices 212 receive the periodic frames periodically transmitted from the respective wireless devices 211.
  • the wireless device 211 may not include the transmission timing control unit 110.
  • the periodic frame is a frame transmitted at regular intervals, that is, a frame transmitted at a constant period.
  • a specific example of the periodic frame is a notification frame for notifying the wireless device 212 of the existence of the wireless device 211.
  • the periodic frame may be a unicast frame.
  • the operation of the wireless communication device 100 corresponds to a wireless communication method.
  • the procedure of the wireless communication method corresponds to the procedure of the wireless communication program.
  • a wireless communication method of the wireless device 211 will be described with reference to FIG.
  • the wireless communication method of the wireless device 211 is started when the application unit 141 instructs the transmission timing control unit 110 to start the periodic transmission of periodic frames. Then, the wireless communication method of the wireless device 211 ends when the application unit 141 instructs the transmission timing control unit 110 to end the periodic transmission of the periodic frame.
  • step S110 the initialization unit 111 initializes communication parameters.
  • the communication parameter is a parameter for regularly transmitting a periodic frame.
  • the initialization unit 111 sets the transmission period of the periodic frame and the offset reset period in the storage area for communication parameters.
  • the transmission period of the periodic frame is a fixed period in which the periodic frame is transmitted.
  • the offset reset cycle is a fixed cycle in which the offset is reset.
  • the offset is a waiting time until the regular transmission of periodic frames is started.
  • the transmission period of the periodic frame and the reset period of the offset are designated by the application unit 141.
  • the offset reset period has the following features.
  • the reset cycle of the offset is longer than the transmission cycle of the periodic frame.
  • the offset reset period is longer than the expected completion time of the communication sequence, which is a series of communication with the wireless device 212.
  • the scheduled completion time of the communication sequence is the time required from the start of the communication sequence to the completion of the communication sequence.
  • a specific example of the communication sequence is a series of communications for establishing a connection between the wireless device 212 and the wireless device 211, or data exchange executed without establishing the connection.
  • step S120 the offset setting unit 113 randomly sets the offset.
  • the offset setting unit 113 sets the offset as follows. First, the offset setting unit 113 generates a random number. Next, the offset setting unit 113 calculates the offset using the generated random number. Then, the offset setting unit 113 sets the calculated offset in the storage area for communication parameters.
  • step S130 the reset control unit 112 starts a reset cycle.
  • the reset control unit 112 starts the process for detecting the expiration of the reset cycle.
  • the reset control unit 112 starts a reset cycle timer.
  • the reset cycle timer times out when the same time as the reset cycle elapses.
  • step S140 the offset waiting unit 114 waits for the offset set in step S120 to elapse.
  • the offset waiting unit 114 activates the offset timer and waits until the offset timer times out. The offset timer times out when the same time as the offset has elapsed.
  • step S150 the regular transmission control unit 115 starts regular transmission of periodic frames. Specifically, the regular transmission control unit 115 instructs the data communication unit 142 to start the regular transmission of periodic frames. After that, the data communication unit 142 inputs the periodic frame to the wireless communication unit 120 every time the transmission period elapses. Then, the wireless communication unit 120 transmits the periodic frame to the wireless device 212 each time the periodic frame is input.
  • step S160 the reset control unit 112 determines whether the reset cycle has expired. For example, the reset control unit 112 detects the timeout of the reset cycle timer. When the reset period timer times out, the reset period expires. Step S170 is repeated until the reset period expires. If the reset cycle has expired, the process proceeds to step S170.
  • step S170 the regular transmission control unit 115 stops regular transmission of the periodic frame. Specifically, the regular transmission control unit 115 instructs the data communication unit 142 to stop the periodic transmission of periodic frames. After that, the data communication unit 142 stops the input of the periodic frame to the wireless communication unit 120. After step S170, the process proceeds to step S120.
  • each wireless device 211 sets a random offset each time the reset cycle expires. Thereby, each wireless device 211 realizes the change of the transmission timing of the periodic frame and the periodic transmission of the periodic frame.
  • Radio R represents radio 212.
  • the wireless device A represents the wireless device 211A
  • the wireless device B represents the wireless device 211B
  • the wireless device C represents the wireless device 211C.
  • the shaded left and right arrows represent the offset reset period.
  • the white left and right arrows represent the offset of regular transmission.
  • the linear left and right arrows represent the transmission cycle of the periodic frame. Squares represent periodic frames.
  • the dashed arrow to the radio R represents the transmission of the broadcast frame. Crosses represent collisions of periodic frames.
  • each wireless device (A to C) periodically sent a periodic frame after the randomly set offset has elapsed. Then, a collision of periodic frames occurred. Therefore, the wireless device R could not receive the periodic frame from each of the wireless devices (A to C).
  • each radio (A to C) resets the offset randomly at each expiration of the reset cycle.
  • each wireless device (A to C) periodically transmitted a periodic frame after the randomly reset offset has elapsed. Then, collision of periodic frames did not occur. Therefore, the wireless device R was able to receive the periodic frames from the respective wireless devices (A to C).
  • each wireless device (A to C) periodically sent a periodic frame after the randomly reset offset has elapsed. Then, collision of periodic frames did not occur. Therefore, the wireless device R was able to receive the periodic frames from the respective wireless devices (A to C).
  • the transmission interval of periodic frames does not necessarily match the transmission period of periodic frames before and after the expiration of the reset period.
  • the transmission interval of periodic frames may be shorter than the transmission period of periodic frames before and after the expiration of the reset period.
  • the transmission interval of the periodic frame may match the transmission period of the periodic frame before and after the expiration of the reset period.
  • the wireless communication unit 120 transmits/receives a wireless signal of a frame via the wireless antenna 104.
  • the wireless communication unit 120 obtains a frame by demodulating the received wireless signal and delivers the content of the frame to the data communication unit 142.
  • the wireless communication unit 120 also receives data from the data communication unit 142, modulates the received data into a frame wireless signal, and transmits the frame wireless signal.
  • the data communication unit 142 instructs the wireless communication unit 120 to transmit a frame according to the instruction from the application unit 141 or the transmission timing control unit 110.
  • the data communication unit 142 receives data from the wireless communication unit 120, and delivers the received data to the application unit 141 or the transmission timing control unit 110. Furthermore, the data communication unit 142 may issue a frame transmission instruction to the wireless communication unit 120 according to a prior instruction (arrangement) from the application unit 141 without exchanging data with the application unit 141. For example, when periodic transmission of frames is necessary, or when an immediate reply to the frame received by the wireless communication unit 120 is necessary, the data communication unit 142 follows the content of the instruction arranged by the application unit 141. , Frame transmission.
  • the application unit 141 controls communication between the wireless device 211 and the wireless device 212.
  • the application unit 141 executes frame destination determination, frame content determination, frame transmission, frame reception, response after frame reception, and the like.
  • the application unit 141 instructs the transmission timing control unit 110 to transmit a frame.
  • the application unit 141 negotiates the content of the transmission frame and instructs the data communication unit 142 in advance about the agreed content.
  • the transmission timing control unit 110 controls the transmission timing of a frame (specifically, a periodic frame) whose transmission timing needs to be controlled according to an instruction from the application unit 141.
  • the recording unit 130 holds communication parameters and the like.
  • the application unit 141 of the wireless device 212 receives the received periodic frame from the data communication unit 142 and performs a prescribed operation. This behavior is determined by user specification or programming. For example, the application unit 141 receives each periodic frame of one or more wireless devices 211 and selects a communication partner from the one or more wireless devices 211. Then, the application unit 141 establishes a connection with the communication partner upon receiving the next periodic frame from the communication partner. When a quick response is required when establishing a connection, the data communication unit 142 may implement such a function. The application unit 141 may perform mutual communication (data exchange) without establishing a connection with the communication partner when the next periodic frame from the selected communication partner is received.
  • the wireless device 212 can communicate with one wireless device 211 at a specific timing. For example, the wireless device 212 selects a communication partner from a plurality of wireless devices 211 upon receiving the first periodic frame, and establishes a connection upon receiving the next periodic frame from the communication partner. In this case, it is most efficient to receive the periodic frame from the communication partner twice in succession. Alternatively, when the wireless device 212 needs to exchange data with the communication partner N times, the wireless device 212 receives the periodic frame from the communication partner N times in succession, which is the most efficient.
  • the collision probability of the periodic frame from the wireless device 211A in the case where a random offset is set for each transmission of the periodic frame will be described based on FIG.
  • the vertical axis represents the frame collision probability
  • the horizontal axis represents time.
  • the frame collision probability is the probability that a periodic frame from the wireless device 211A collides with a periodic frame from another wireless device 211 at the same time as the reset period. When observed over a long period of time, the average value of the frame collision probabilities is close to the frame collision probability in each time zone. When the frame collision probability increases, the wireless device 212 needs to wait until it successfully receives the periodic frame from the wireless device 211A.
  • the graph in FIG. 6 is based on ideal conditions. The graph of FIG. 6 varies depending on various factors such as the number of wireless devices 211, a transmission period of a periodic frame, an offset reset period, and a wireless environment of the system.
  • the collision probability of the periodic frame from the wireless device 211A will be described for the case where a random offset is set every time the reset period expires, that is, the case where the first embodiment is applied.
  • the average value of frame collision probabilities is equivalent to the frame collision probability in FIG.
  • the frame collision probability varies greatly depending on the time period. This is because the collision status of the periodic frames is different for each time zone. This is because, for example, a situation in which a periodic frame collision occurs in a certain time zone continues and a situation in which a periodic frame collision does not occur in another time zone continues. In a time period when the frame collision probability is low, the probability that the wireless device 212 receives the periodic frame from the wireless device 211A is high.
  • the time required for the wireless device 212 to successfully receive the periodic frame from the wireless device 211A multiple times is shortened.
  • the probability that the wireless device 212 receives the periodic frame from the wireless device 211A is low.
  • the wireless device 212 receives the periodic frame from the other wireless device 211, so that the time period is efficiently used. To be done. Then, a random offset is reset in the next time zone. As a result, if the probability that the wireless device 212 receives the periodic frame from the wireless device 211A becomes low, the wireless device 212 may receive the periodic frame from the wireless device 211A.
  • an offset having a sufficient length to completely avoid collision of periodic frames is set, but a random offset is set every time the reset period expires.
  • the wireless device 212 receives the periodic frames from some of the wireless devices 211 in which the periodic frame collision does not occur in response to the operation and the request of the wireless device 212. Receive continuously.
  • the request from the wireless device 212 is, for example, to receive a periodic frame multiple times.
  • the wireless device 212 successfully receives the periodic frames in a short time and satisfies the required performance.
  • the required performance corresponds to the response performance if a response is required.
  • each wireless device 211 waits for a random offset at each reset cycle and transmits the periodic frame within the transmission period of the periodic frame. Therefore, even when the number of wireless devices 211 existing in the vicinity becomes large, the timing at which the wireless device 212 receives the periodic frame from each wireless device 211 becomes uniform in the long term. That is, it is possible to maintain the fairness of the transmission opportunity between the wireless devices 211.
  • the transmission timing control unit 110 may start the reset cycle after the offset has elapsed. That is, in FIG. 5, the order of step S130 and step S140 may be exchanged.
  • the transmission timing control unit 110 may determine the next offset while waiting for the lapse of the current offset or waiting for the expiration of the current reset cycle.
  • the wireless communication device 100 includes an offset setting unit 113, an offset standby unit 114, and a regular transmission control unit 115.
  • the offset setting unit 113 randomly sets an offset each time the reset cycle expires.
  • the offset standby unit 114 waits for the lapse of a randomly set offset each time the reset cycle expires.
  • the periodic transmission control unit 115 stops the periodic transmission of the periodic frame until the randomly set offset elapses at each expiration of the reset period, and then performs the periodic transmission of the periodic frame after the randomly set offset elapses. Let it start.
  • the offset reset period has the following features.
  • the reset cycle of the offset is longer than the transmission cycle of the periodic frame.
  • the offset reset cycle is longer than the expected completion time of the communication sequence, which is a series of communication with the communication partner.
  • a specific example of the communication sequence is a series of communication for establishing a connection, or data exchange executed without establishing a connection.
  • Embodiment 2 Regarding the mode in which the wireless device 212 selects a communication partner from a plurality of wireless devices 211, differences from the first embodiment will be mainly described with reference to FIGS. 9 and 10.
  • the wireless communication device 100 further includes a wireless communication evaluation unit 150.
  • the wireless communication program further causes a computer to function as the wireless communication evaluation unit 150.
  • the function of the wireless communication evaluation unit 150 will be described later.
  • the hardware configuration of the wireless communication device 100 is the same as the configuration in the first embodiment (see FIG. 3).
  • the configuration of the wireless communication system 200 is the same as the configuration in the first embodiment (see FIG. 4).
  • the wireless communication method of the wireless device 211 is the same as the method in the first embodiment (see FIG. 5).
  • a wireless communication method of the wireless device 212 will be described with reference to FIG.
  • the wireless communication method of the wireless device 212 is started when the application unit 141 instructs the wireless communication evaluation unit 150 to evaluate wireless communication with each wireless device 211.
  • step S210 the wireless communication evaluation unit 150 determines whether a periodic frame has been received.
  • the wireless communication evaluation unit 150 determines whether a periodic frame has been received as follows. Upon receiving the periodic frame from the wireless communication unit 120, the data communication unit 142 passes the received periodic frame to the wireless communication evaluation unit 150. When the wireless communication evaluation unit 150 receives the periodic frame from the wireless communication evaluation unit 150, the wireless communication evaluation unit 150 determines that the periodic frame has been received.
  • step S220 If the periodic frame is received, the process proceeds to step S220. If the periodic frame has not been received, the process proceeds to step S230.
  • step S220 the wireless communication evaluation unit 150 records the information of the received periodic frame. Specifically, the wireless communication evaluation unit 150 transfers the information of the received periodic frame to the recording unit 130. Then, the recording unit 130 records the passed information in the memory 102.
  • a specific example of the information of the periodic frame is shown below.
  • (1) Source of periodic frame The transmission source of the periodic frame is set to the periodic frame.
  • (2) Received power of periodic frame The received power of the periodic frame is the power of the radio signal of the periodic frame detected when the periodic frame is received.
  • (3) Sequence number of the periodic frame The sequence number of the periodic frame is a value that is incremented each time the periodic frame is transmitted, and is set in the periodic frame.
  • the offset reset information is the remaining time until the reset period expires, or the number of periodic frames until the reset period expires.
  • the number of periodic frames until the reset period expires is the number of periodic frames that the transmission source can transmit before the reset period expires.
  • the number of periodic frames is calculated, for example, by decrementing the number of periodic frames in the reset period each time the periodic frame is transmitted at the transmission source.
  • the number of periodic frames in the reset cycle is the number of notification complaints transmitted in the reset cycle, and is calculated based on the reset cycle and the transmission cycle of the notification claims.
  • Periodic frame reception interval is the time from the reception of the previous periodic frame whose source is the same as the current periodic frame to the reception of the current periodic frame.
  • (6) Reception timing of periodic frame is, for example, the time when the periodic frame is received.
  • step S220 the process proceeds to step S230.
  • the wireless communication evaluation unit 150 determines whether the evaluation execution condition is satisfied.
  • the evaluation execution condition is a condition for executing the evaluation of the wireless communication with each wireless device 211.
  • the evaluation execution condition may be determined in advance or may be determined by the wireless communication evaluation unit 150.
  • the evaluation execution condition is a condition regarding the elapsed time from when the wireless communication evaluation instruction is received or the number of received periodic frames.
  • the evaluation execution condition for the elapsed time is determined based on the transmission cycle of the periodic frame and the number of periodic frames required for the wireless communication evaluation. When the transmission period of the periodic frame is “T” and the number of periodic frames required for the wireless communication evaluation is “N”, the time obtained by “T ⁇ N” is the evaluation execution condition for the elapsed time. If the evaluation execution condition is satisfied, the process proceeds to step S240. If the evaluation execution conditions are not satisfied, the process proceeds to step S210.
  • step S240 the wireless communication evaluation unit 150 evaluates the wireless communication with each wireless device 211 based on the information of the periodic frame from each wireless device 211. Specifically, the wireless communication evaluation unit 150 evaluates at least one of the collision state of periodic frames and the quality of wireless communication.
  • the evaluation execution condition for the elapsed time is referred to as evaluation time.
  • the wireless communication evaluation unit 150 calculates the number of periodic frames transmitted at the evaluation time (the number of periodic frame transmissions) based on the periodic frame transmission period. Then, the wireless communication evaluation unit 150 calculates the error rate based on the number of transmitted periodic frames and the number of received periodic frames. This error rate is the ratio of periodic frames that have failed to be received.
  • the wireless communication evaluation unit 150 calculates the number of periodic frames that have not been received, based on the sequence numbers of the received one or more periodic frames. Then, the wireless communication evaluation unit 150 calculates the error rate based on the number of received periodic frames and the number of unreceived periodic frames.
  • This error rate is the ratio of missing periodic frames.
  • the wireless communication evaluation unit 150 calculates the average of received power or the dispersion of received power based on the received power of each of the received one or more periodic frames.
  • the wireless communication evaluation unit 150 calculates the time when the offset is reset (reset time) based on the offset reset information obtained from the received periodic frame. Then, the wireless communication evaluation unit 150 selects the periodic frame immediately before the reset time and the periodic frame immediately after the reset time, and evaluates the selected two periodic frames.
  • the wireless communication evaluation unit 150 calculates the time when the offset is reset (reset time) based on the reception intervals of the plurality of received periodic frames.
  • the wireless communication evaluation unit 150 identifies a time zone in which the reception interval has changed, and calculates an intermediate time in the identified time zone. The calculated time is the reset time. Then, the wireless communication evaluation unit 150 selects the periodic frame immediately before the reset time and the periodic frame immediately after the reset time, and evaluates the selected two periodic frames.
  • step S150 the wireless communication evaluation unit 150 selects a communication partner from a plurality of wireless devices 211 based on the evaluation result of wireless communication with each wireless device 211.
  • the wireless communication evaluation unit 150 selects the wireless device 211 having the lowest error rate. (2) The wireless communication evaluation unit 150 selects a transmission source of a periodic frame that is expected to be received by the requested number or more before the offset reset time. (3) The wireless communication evaluation unit 150 selects the wireless device 211 with the highest evaluation of the received power of the periodic frame. (4) The wireless communication evaluation unit 150 selects the wireless device 211 designated by the user or the program. (5) The wireless communication evaluation unit 150 selects the wireless device 211 according to the priority determined by the user or the program. (6) The wireless communication evaluation unit 150 selects the wireless device 211 by combining the selection methods of (1) to (5).
  • step S260 the wireless communication evaluation unit 150 notifies the application unit 141 of the selected communication partner. Then, the application unit 141 performs wireless communication with the selected communication partner via the data communication unit 142 and the wireless communication unit 120. As a result, various frames are transmitted and received between the wireless device 212 and the communication partner.
  • the collision state of periodic frames may change significantly before and after the resetting of the random offset. In that case, if the transmission source of the periodic frame whose transmission timing is changed is selected as the communication partner without knowing the change of the transmission timing of the periodic frame, the waiting time of the periodic frame may become long.
  • the second embodiment can solve such a problem.
  • the wireless device 212 monitors the periodic frame from each wireless device 211. Then, the wireless device 212 selects the wireless device 211 with high wireless communication quality as a communication partner at the timing when the frame collision probability is low. As a result, it is possible to avoid a long waiting time for receiving the periodic frame in the wireless device 212.
  • the wireless communication device 100 includes a wireless communication unit 120.
  • the wireless communication unit 120 receives, from each of the plurality of wireless devices 211, a periodic frame that is periodically transmitted after the randomly set offset has elapsed each time the reset period has expired.
  • the reset cycle of the offset is longer than the transmission cycle of the periodic frame.
  • the offset reset cycle is longer than the expected completion time of the communication sequence, which is a series of communication with the communication partner.
  • a specific example of the communication sequence is a series of communication for establishing a connection, or data exchange executed without establishing a connection.
  • the wireless communication device 100 includes a wireless communication evaluation unit 150.
  • the wireless communication evaluation unit 150 evaluates wireless communication with each wireless device 211 based on the information on the periodic frame from each wireless device 211, and selects a communication partner from the plurality of wireless devices 211 based on the evaluation result. ..
  • the wireless communication evaluation unit 150 based on the information on the periodic frames from the wireless devices 211, at least one of the collision status of the periodic frames from the wireless devices 211 and the quality of wireless communication with the wireless devices 211. Evaluate.
  • Embodiment 3 Regarding the mode of changing the communication partner, mainly the points different from the first and second embodiments will be described based on FIG. 11.
  • the functional configuration of the wireless communication device 100 is the same as that of the second embodiment (see FIG. 9).
  • the hardware configuration of the wireless communication device 100 is the same as the configuration in the first embodiment (see FIG. 3).
  • the configuration of wireless communication system 200 is the same as that of the first embodiment (see FIG. 4).
  • the wireless communication method of the wireless device 211 is the same as the method in the first embodiment (see FIG. 5).
  • step S310 the wireless communication evaluation unit 150 selects a communication partner from the plurality of wireless devices 211.
  • the selection method is the same as the method in the second embodiment (see FIG. 10).
  • the application unit 141 may select a communication partner by an arbitrary method instead of the wireless communication evaluation unit 150. In that case, the wireless communication evaluation unit 150 is unnecessary.
  • step S320 the application unit 141 starts wireless communication with the selected communication partner.
  • step S320 the application unit 141 measures the elapsed time for each series of communication with the communication partner.
  • a series of communications with a communication partner is called a "communication sequence".
  • a specific example of the communication sequence is a series of communication for establishing a connection, or data exchange executed without establishing a connection.
  • step S330 the application unit 141 compares the elapsed time in the communication sequence being executed with the scheduled completion time, and determines whether the elapsed time in the communication sequence being executed is longer than the expected completion time.
  • the scheduled completion time is an expected value of the time until the communication sequence is completed.
  • the scheduled completion time is determined by the application unit 141 as follows. It is necessary to receive the periodic frame N times before starting the connection establishment. Time C is required after the connection is established. The transmission cycle of the periodic frame is "T”. The frame collision probability is “P”. In this case, the expected value of the binomial distribution is represented by “(N ⁇ P) ⁇ T+C+ ⁇ ”. “ ⁇ ” is a margin. Examples of the margin include frame retransmission and frame interval.
  • the application unit 141 calculates this expected value. The calculated expected value becomes the scheduled completion time. The application unit 141 may calculate the time to complete the connection establishment with a probability of X% or more based on the binomial distribution. The calculated time is the scheduled completion time. For example, the evaluation result in the second embodiment is used as the frame collision probability. Further, the system designer may predetermine the frame collision probability based on the boundary value at which the frame waiting time becomes long.
  • step S310 the wireless communication with the current communication partner is ended, and a communication partner different from the current communication partner is selected. As a result, the communication partner is changed. If the elapsed time in the communication sequence being executed is equal to or less than the scheduled completion time, the process proceeds to step S340.
  • step S340 the application unit 141 determines whether the wireless communication with the communication partner has ended.
  • the determination method is arbitrary. If the wireless communication with the communication partner has ended, the process proceeds to step S310.
  • step S310 the wireless communication with the current communication partner is ended, and a communication partner different from the current communication partner is selected. As a result, the communication partner is changed. If the wireless communication with the communication partner has not ended, the process proceeds to step S330.
  • the frame collision situation may be deteriorated by changing the transmission timing of various frames. is there. In that case, the frame waiting time may increase.
  • a situation in which a frame collision occurs a situation in which the quality of wireless communication is deteriorated, or a situation in which a frame waiting time becomes long can be detected based on the elapsed time in the communication sequence.
  • the wireless communication with the current communication partner ends, and another communication partner is selected. This makes it possible to reduce the frame waiting time.
  • the communication partner may be selected by a simpler method than the selection method in the second embodiment. This eliminates the time required to evaluate the wireless communication with each wireless device 211.
  • the wireless device 212 detects a decrease in wireless communication quality due to a change in the surrounding conditions of each wireless device 211 based on the expected value of the time until the communication sequence with the communication partner is completed. It becomes possible to do. Further, it becomes possible to detect a change in the transmission timing of the periodic frame due to the resetting of the offset. As a result, if the time to wait for the periodic frame becomes long, the wireless communication with the current communication partner is canceled and another communication partner is searched for. As a result, it is possible to cancel the wireless communication with the wireless device 211 in which the frame collision probability has deteriorated, and to avoid lengthening the time for waiting for a periodic frame.
  • the wireless communication device 100 includes an application unit 141.
  • the application unit 141 changes the communication partner when the elapsed time in the communication sequence, which is a series of communication with the communication partner, is longer than the scheduled completion time.
  • a specific example of the communication sequence is a series of communication for establishing a connection, or data exchange executed without establishing a connection.
  • the functional configuration of the wireless communication device 100 is the same as that of the second embodiment (see FIG. 9).
  • the hardware configuration of the wireless communication device 100 is the same as the configuration in the first embodiment (see FIG. 3).
  • the configuration of wireless communication system 200 is the same as that of the first embodiment (see FIG. 4).
  • the wireless communication method of the wireless device 211 is the same as the method in the first embodiment (see FIG. 5).
  • a wireless communication method of the wireless device 212 will be described with reference to FIG. Description of the wireless communication methods described in each of the second and third embodiments will be omitted.
  • step S410 the wireless communication evaluation unit 150 determines whether a periodic frame has been received.
  • Step S410 is the same as the method in step S210 of the second embodiment (see FIG. 10). If the periodic frame is received, the process proceeds to step S420. If the periodic frame has not been received, the process proceeds to step S430.
  • step S420 the wireless communication evaluation unit 150 records information on the received periodic frame.
  • the information of the periodic frame is the same as the information in step S220 of the second embodiment (see FIG. 10).
  • the wireless communication evaluation unit 150 evaluates the wireless communication with each wireless device 211 based on the information of the periodic frame from each wireless device 211. Specifically, the wireless communication evaluation unit 150 evaluates by the method in step S240 of the second embodiment. Furthermore, the wireless communication evaluation unit 150 calculates the number of wireless devices 211 that are the transmission sources of the received periodic frames. The wireless communication evaluation unit 150 also calculates the average of the evaluation results and the variance of the evaluation results based on the evaluation results of the wireless communication with the respective wireless devices 211.
  • the wireless communication evaluation unit 150 records the evaluation result of wireless communication with each wireless device 211.
  • step S420 the process proceeds to step S430.
  • the wireless communication evaluation unit 150 determines whether the parameter change condition is satisfied.
  • the parameter changing condition is a condition for changing the communication parameter of each wireless device 211.
  • the parameter changing condition may be determined in advance or may be determined by the wireless communication evaluation unit 150.
  • the parameter changing condition is a condition that the evaluation result in the time required to receive the number of periodic frames required for wireless communication evaluation exceeds the threshold value.
  • the required time is determined based on the transmission cycle of the periodic frame. When the transmission cycle of the periodic frame is “T” and the number of periodic frames required for the wireless communication evaluation is “N”, the time required by “T ⁇ N” is the required time.
  • a specific example of the evaluation result is the number of wireless devices 211 that are the transmission sources of the periodic frames received during the required time, the received power of the periodic frames received during the required time, or the periodic frame at the required time.
  • the reception success rate If the parameter change condition is satisfied, the process proceeds to step S440. If the parameter change condition is not satisfied, the process proceeds to step S410.
  • step S440 the wireless communication evaluation unit 150 instructs each wireless device 211 to change the communication parameter by wireless communication with each wireless device 211.
  • the wireless communication evaluation unit 150 may instruct all the wireless devices 211 to change the communication parameters, or may only instruct the wireless devices 211 that satisfy the parameter changing conditions to change the communication parameters.
  • the wireless communication evaluation unit 150 may instruct to change the communication parameter by communicating the periodic frame, or may instruct to change the communication parameter in the communication sequence (response sequence) before establishing the connection. Further, the wireless communication evaluation section 150 may instruct to change the communication parameter in the communication sequence when establishing the connection (or exchanging data).
  • the wireless communication evaluation unit 150 may notify each wireless device 211 of the changed communication parameter.
  • Specific examples of communication parameters include a transmission cycle of a periodic frame, an offset resetting cycle, and an offset 1 slot time.
  • the wireless device 211 which is the source of the periodic frames having a high reception success rate, is instructed to extend the transmission period of the periodic frames.
  • the offset resetting is instructed to two or more wireless devices 211 whose transmission timings of the periodic frames are close.
  • the transmission timing of the periodic frame is changed in each wireless device 211.
  • This instruction is likely to cause a phenomenon that the periodic frames collide when the transmission timings of the periodic frames from the respective radios 211 are close to each other, or that a reception process for each periodic frame cannot be performed in time. To be done.
  • each wireless device 211 is instructed to extend the transmission period of the periodic frame.
  • step S440 the process proceeds to step S410.
  • the wireless communication evaluation unit 150 may not know the number of wireless devices 211 that transmit the periodic frame and the unique number of each wireless device 211. In that case, the wireless communication evaluation unit 150 cannot specify the source of the periodic frame that cannot be received due to a frame collision or the like. However, the wireless communication evaluation unit 150 can recognize the number of wireless devices 211 and the unique number of the wireless devices 211 by continuing to wait for frame reception.
  • a specific example of the unique number is a MAC address.
  • MAC is an abbreviation for Media Access Control.
  • the wireless device 212 confirms the surrounding conditions such as the number of wireless devices 211 and the communication parameters of each wireless device 211 are changed. This reduces the frame latency.
  • the wireless device 212 monitors the periodic frame and changes the communication parameter of each wireless device 211 according to the situation such as the number of wireless devices 211 existing in the vicinity. As a result, it is possible to improve the frame collision probability and shorten the time required for the communication sequence.
  • the wireless communication device 100 includes a wireless communication evaluation unit 150.
  • the wireless communication evaluation unit 150 evaluates the wireless communication with each wireless device 211 based on the information on the periodic frame of each wireless device 211, and based on the evaluation result, sets the communication parameter of each wireless device 211. Instruct to change.
  • each wireless device 211 may evaluate the wireless communication of each wireless device 211 existing in the communication range. Then, each wireless device 211 may voluntarily change the communication parameter based on the evaluation result.
  • the wireless communication evaluation unit 150 of the wireless device 211 evaluates the wireless communication of each wireless device 211 during the period when the periodic frame is not transmitted, and changes its communication parameter based on the evaluation result.
  • the wireless communication evaluation unit 150 monitors the surrounding frame transmission/reception status at an appropriate timing. Specifically, similarly to the monitoring in FIG. 12, the wireless communication evaluation unit 150 obtains information such as the number of periodic frame transmissions per fixed time and the periodic frame transmission timing for each wireless device 211. Then, the wireless communication evaluation unit 150 evaluates the surrounding situation based on the obtained information and voluntarily changes the communication parameter based on the evaluation result.
  • Each wireless device 211 can voluntarily change the communication parameter. As a result, it becomes unnecessary for the wireless device 212 to communicate in order to instruct each wireless device 211 to change the communication parameter.
  • the wireless communication device 100 includes a wireless communication evaluation unit 150.
  • the wireless communication evaluation unit 150 evaluates the wireless communication of each wireless device 211 based on the information of each periodic frame of the plurality of wireless devices 211 existing in the communication range, and changes the communication parameter based on the evaluation result.
  • Embodiment 5 After the communication sequence with the wireless device 212 or during the communication sequence with the wireless device 212, the configuration in which each wireless device 211 adjusts the transmission amount of the periodic frame is mainly described in the first embodiment to the fourth embodiment. The different points will be described based on FIGS. 13 and 14.
  • the wireless communication device 100 further includes a regular transmission suppressing unit 160.
  • the wireless communication program further causes a computer to function as the regular transmission suppressing unit 160.
  • the hardware configuration of the wireless communication device 100 is the same as the configuration in the first embodiment (see FIG. 3).
  • the configuration of wireless communication system 200 is the same as that of the first embodiment (see FIG. 4).
  • the wireless communication method of the wireless device 211 is the same as the method in the first embodiment (see FIG. 5).
  • a wireless communication method of the wireless device 212 will be described with reference to FIG. The description of the wireless communication methods described in the second to fourth embodiments will be omitted.
  • step S510 the regular transmission suppressing unit 160 determines whether the connection with the wireless device 211, which is a communication partner, has been established. For example, the regular transmission suppressing unit 160 determines whether the communication sequence for establishing a connection with the wireless device 211 is completed. When this communication sequence is completed, the connection with the wireless device 211 has been established. When the connection with the wireless device 211, which is the communication partner, is established, the process proceeds to step S520. Step S510 is repeated until the connection with the wireless device 211, which is the communication partner, is established.
  • step S520 the regular transmission suppressing unit 160 wirelessly communicates with the wireless device 211, which is a communication partner, to instruct the wireless device 211, which is a communication partner, to reduce the transmission amount of periodic frames.
  • the regular transmission suppressing unit 160 gives the following instruction to the wireless device 211 that is a communication partner. (1) Instruct to extend the transmission cycle of the periodic frame. (2) Instruct to suspend the periodic transmission of periodic frames. (3) Instruct to stop transmission of the periodic frame when the suppression condition is satisfied.
  • the suppression condition is a condition for stopping the transmission of the periodic frame.
  • the suppression condition indicates a cancellation probability.
  • the stop probability is the probability of stopping the transmission of the periodic frame.
  • the suppression condition indicates the stop probability
  • the transmission of the periodic frame is stopped at the same rate as the stop probability.
  • the suppression condition indicates the number of times of cancellation.
  • the stop number is a number for designating how many times transmission of the periodic frame is stopped.
  • the suppression condition indicates the cancellation time
  • the transmission of the periodic frame of the same times as the cancellation time is canceled.
  • the suppression condition indicates “odd number”
  • the odd-numbered transmission of the periodic frame is stopped.
  • the suppression condition indicates the stop interval.
  • the stop interval is an interval at which transmission of periodic frames is stopped.
  • the suppression condition indicates the stop interval
  • the transmission of the periodic frame is stopped at the same interval as the stop interval. For example, when the suppression condition indicates "once every N times", the transmission of the periodic frame is stopped once every N times.
  • the regular transmission suppressing unit 160 may change the instruction content according to the evaluation result of the wireless communication with the wireless device 211 that is the communication partner.
  • step S510 the regular transmission suppressing unit 160 determines whether the connection with the wireless device 211, which is the communication partner, is being established, and whether the connection is about to be completed. If the connection with the wireless device 211, which is the communication partner, is being established and the connection is about to be completed, the process proceeds to step S520. Step S510 is repeated until the connection with the wireless device 211, which is the communication partner, is being established and the connection is about to be completed.
  • step S510 the regular transmission suppressing unit 160 determines whether or not data exchange with the wireless device 211, which is a communication partner, is in progress, and the data exchange is about to be completed. If data is being exchanged with the wireless device 211, which is a communication partner, and the data exchange is almost complete, the process proceeds to step S520. Step S510 is repeated until data exchange with the wireless device 211, which is a communication partner, is being performed and the data exchange is about to be completed.
  • a factor that greatly affects the frame waiting time is the wireless device 211 that performs a communication sequence (for example, connection establishment or data exchange).
  • a communication sequence for example, connection establishment or data exchange.
  • the frame collision probability is reduced.
  • frame latency is reduced.
  • the number of frames in the entire network can be reduced by extending the transmission period of the periodic frame in the wireless device 211 or temporarily stopping the regular transmission of the periodic frame in the wireless device 211.
  • the probability of frame collision is reduced and the frame waiting time is shortened.
  • the fifth embodiment it is possible to reduce the amount of periodic frames transmitted from the wireless device 211, which does not require communication, within a range that does not adversely affect the request of the wireless device 212. As a result, the probability of frame collision is reduced, and a long frame waiting time is avoided.
  • the wireless communication device 100 includes a regular transmission suppressing unit 160.
  • the regular transmission suppressing unit 160 instructs the communication partner to adjust the transmission amount of the periodic frame after the communication sequence with the wireless device 211 which is the communication partner or during the communication sequence.
  • the regular transmission suppressing unit 160 gives an instruction to extend the transmission interval of the periodical frame, temporarily stop the periodical transmission of the periodical frame, or cancel the periodical frame when the suppression condition is satisfied.
  • the suppression condition indicates the probability of cancellation, the number of times of cancellation, or the interval of cancellation.
  • the stop probability is the probability of stopping the transmission of the periodic frame.
  • the stop number is a number for designating how many times transmission of the periodic frame is stopped.
  • the stop interval is an interval at which transmission of periodic frames is stopped.
  • each wireless device 211 may determine the completion of the communication sequence (for example, connection establishment or data exchange) with the wireless device 212.
  • each radio 211 may determine that it is in the communication sequence, instead of the radio 212. After the communication sequence with the wireless device 212 or during the communication sequence with the wireless device 212, each wireless device 211 voluntarily adjusts (reduces) the transmission amount of the periodic frame.
  • Each wireless device 211 can voluntarily reduce the transmission amount of the periodic frame. As a result, it becomes unnecessary for the wireless device 212 to communicate in order to instruct each wireless device 211 to reduce the transmission amount of the periodic frame.
  • the wireless communication device 100 includes a regular transmission suppressing unit 160.
  • the regular transmission suppressing unit 160 adjusts the transmission amount of periodic frames at the time of completion of a communication sequence (connection establishment or data exchange) with the wireless device 212 which is a communication partner, or during the communication sequence.
  • the regular transmission suppressing unit 160 extends the transmission interval of periodic frames, suspends periodic transmission of periodic frames, or cancels periodic frames when the suppression condition is satisfied.
  • the suppression condition indicates the probability of cancellation, the number of times of cancellation, or the interval of cancellation.
  • the stop probability is the probability of stopping the transmission of the periodic frame.
  • the stop number is a number for designating how many times transmission of the periodic frame is stopped.
  • the stop interval is an interval at which transmission of periodic frames is stopped.
  • the wireless communication device 100 includes a processing circuit 109.
  • the processing circuit 109 is hardware that implements the transmission timing control unit 110, the wireless communication unit 120, the recording unit 130, the application unit 141, the data communication unit 142, the wireless communication evaluation unit 150, and the regular transmission suppression unit 160.
  • the processing circuit 109 may be dedicated hardware or the processor 101 that executes a program stored in the memory 102.
  • the processing circuit 109 is dedicated hardware, the processing circuit 109 is, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof.
  • ASIC is an abbreviation for Application Specific Integrated Circuit
  • FPGA is an abbreviation for Field Programmable Gate Array.
  • the wireless communication device 100 may include a plurality of processing circuits that replace the processing circuit 109. The plurality of processing circuits share the role of the processing circuit 109.
  • some functions may be realized by dedicated hardware and the remaining functions may be realized by software or firmware.
  • the processing circuit 109 can be realized by hardware, software, firmware, or a combination thereof.
  • the embodiment is an exemplification of a preferred embodiment, and is not intended to limit the technical scope of the present invention.
  • the embodiment may be partially implemented or may be implemented in combination with other embodiments.
  • the procedure described using the flowcharts and the like may be changed as appropriate.
  • the “unit” that is an element of the wireless communication device 100 may be read as “process” or “process”.
  • the periodic frame has been described as an example of the periodic frame.
  • each radio 211 does not perform carrier sense. Further, arrival confirmation using an arrival confirmation frame such as an ACK frame cannot be performed.
  • the periodic frame is not limited to the notification claim.
  • each embodiment may be used when the functional condition is satisfied without being used in the initial state.
  • Each element of the wireless communication device 100 determines whether the functional condition is satisfied. Then, when the functional condition is satisfied, each element of the wireless communication device 100 operates.
  • the functional condition is a condition regarding the number of periodic frames transmitted per unit time.
  • the communication parameter is changed when the number of periodic frames transmitted per unit time exceeds a threshold value. This makes it possible to perform efficient control for avoiding a frame collision when the functional condition is satisfied.
  • 100 wireless communication device 101 processor, 102 memory, 103 wireless communication device, 104 wireless antenna, 109 processing circuit, 110 transmission timing control unit, 111 initialization unit, 112 reset control unit, 113 offset setting unit, 114 offset standby unit , 115 regular transmission control unit, 120 wireless communication unit, 130 recording unit, 141 application unit, 142 data communication unit, 150 wireless communication evaluation unit, 160 regular transmission suppressing unit, 200 wireless communication system, 210 wireless device, 211 wireless device, 212 Radio.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
PCT/JP2018/048490 2018-12-28 2018-12-28 無線通信装置、無線通信方法および無線通信プログラム WO2020136877A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE112018008173.7T DE112018008173B4 (de) 2018-12-28 2018-12-28 Drahtlos-kommunikationseinrichtung; drahtlos-kommunikationsverfahren und drahtlos-kommunikationsprogramm
JP2020562274A JP7118171B2 (ja) 2018-12-28 2018-12-28 無線通信装置、無線通信方法および無線通信プログラム
PCT/JP2018/048490 WO2020136877A1 (ja) 2018-12-28 2018-12-28 無線通信装置、無線通信方法および無線通信プログラム
CN201880100404.4A CN113228805B (zh) 2018-12-28 2018-12-28 无线通信装置、无线通信方法以及计算机能读取的记录介质
KR1020217018328A KR102372459B1 (ko) 2018-12-28 2018-12-28 무선 통신 장치, 무선 통신 방법 및 기록 매체에 저장된 무선 통신 프로그램

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2018/048490 WO2020136877A1 (ja) 2018-12-28 2018-12-28 無線通信装置、無線通信方法および無線通信プログラム

Publications (1)

Publication Number Publication Date
WO2020136877A1 true WO2020136877A1 (ja) 2020-07-02

Family

ID=71126236

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/048490 WO2020136877A1 (ja) 2018-12-28 2018-12-28 無線通信装置、無線通信方法および無線通信プログラム

Country Status (5)

Country Link
JP (1) JP7118171B2 (de)
KR (1) KR102372459B1 (de)
CN (1) CN113228805B (de)
DE (1) DE112018008173B4 (de)
WO (1) WO2020136877A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022266914A1 (en) * 2021-06-24 2022-12-29 Shanghai Square Plus Information Technology Consulting Ltd. Control of dc/dc-less wireless charger transmitters in emc sensitive environment

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000013400A (ja) * 1998-06-26 2000-01-14 Fujitsu Ltd 無線ローカルエリアネットワーク及び、これに用いる無線端末装置
JP2005218105A (ja) * 2004-01-30 2005-08-11 Samsung Electronics Co Ltd ルータ及びルータのタイマー設定方法
JP2008301370A (ja) * 2007-06-01 2008-12-11 Mitsubishi Electric Corp 車々間通信装置
JP2013255143A (ja) * 2012-06-08 2013-12-19 Sharp Corp 無線通信装置、無線通信方法、無線通信システム、処理装置

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4582098B2 (ja) 2003-02-03 2010-11-17 ソニー株式会社 無線通信システム、通信装置、通信方法及びプログラム
JP5190233B2 (ja) * 2006-09-01 2013-04-24 パナソニック株式会社 無線通信装置
JP4793192B2 (ja) * 2006-09-13 2011-10-12 パナソニック電工株式会社 多重アクセス通信方法
JP4818950B2 (ja) * 2007-02-22 2011-11-16 日本電信電話株式会社 無線ｌａｎデータパケット衝突回避制御方法およびその装置
JP2008167487A (ja) * 2008-03-14 2008-07-17 Hitachi Kokusai Electric Inc Ｃｓｍａ方式によるデータ伝送方法およびシステム
JP5182625B2 (ja) * 2008-06-04 2013-04-17 株式会社リコー 無線通信ネットワークシステム、アクセスポイント選定プログラムおよびアクセスポイント選定プログラムが記憶された記憶媒体
JP5193823B2 (ja) * 2008-11-20 2013-05-08 三洋電機株式会社 報知方法および無線装置
JP5162691B2 (ja) * 2011-06-03 2013-03-13 パナソニック株式会社 無線通信システム及び通信制御方法並びに通信ノード
JP5672223B2 (ja) * 2011-12-05 2015-02-18 株式会社デンソー 無線通信装置および無線通信方法
US9723630B2 (en) 2014-03-21 2017-08-01 Samsung Electronics Co., Ltd. Contention-based resource allocation method and apparatus for low power D2D communication
JP6405705B2 (ja) * 2014-05-27 2018-10-17 株式会社リコー 通信システム、通信端末、通信方法およびプログラム
KR101593370B1 (ko) * 2015-05-27 2016-02-15 연세대학교 원주산학협력단 데이터 충돌을 기초로 한 백오프 결정 방법
CN105828452B (zh) * 2016-05-10 2019-10-08 珠海市魅族科技有限公司 无线局域网的通信方法、通信装置、接入点和站点
JP6097983B1 (ja) * 2016-11-30 2017-03-22 サイレックス・テクノロジー株式会社 無線通信装置およびプログラム

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000013400A (ja) * 1998-06-26 2000-01-14 Fujitsu Ltd 無線ローカルエリアネットワーク及び、これに用いる無線端末装置
JP2005218105A (ja) * 2004-01-30 2005-08-11 Samsung Electronics Co Ltd ルータ及びルータのタイマー設定方法
JP2008301370A (ja) * 2007-06-01 2008-12-11 Mitsubishi Electric Corp 車々間通信装置
JP2013255143A (ja) * 2012-06-08 2013-12-19 Sharp Corp 無線通信装置、無線通信方法、無線通信システム、処理装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022266914A1 (en) * 2021-06-24 2022-12-29 Shanghai Square Plus Information Technology Consulting Ltd. Control of dc/dc-less wireless charger transmitters in emc sensitive environment

Also Published As

Publication number Publication date
JP7118171B2 (ja) 2022-08-15
KR102372459B1 (ko) 2022-03-08
JPWO2020136877A1 (ja) 2021-04-30
CN113228805A (zh) 2021-08-06
CN113228805B (zh) 2024-01-16
DE112018008173B4 (de) 2022-12-15
DE112018008173T5 (de) 2021-08-26
KR20210082257A (ko) 2021-07-02

Similar Documents

Publication Publication Date Title
TWI554058B (zh) 無線通訊方法與裝置
US20240064778A1 (en) Wireless communication method for simultaneous data transmission and reception and wireless communication apparatus using same
JP5739071B2 (ja) 複数のデバイスがデータ送信期間を共有することを可能にするための方法および装置
JP6646738B2 (ja) データ伝送方法、端末及びｒａｎデバイス
US9516675B2 (en) Method for accessing wireless local area network, access point and wireless local area network system
US11089609B2 (en) Smart radio arbiter with conflict resolution based on timing predictability
JP5475790B2 (ja) 無線通信装置および通信プログラム
WO2020136877A1 (ja) 無線通信装置、無線通信方法および無線通信プログラム
US10333582B2 (en) System and devices using a preamble-based DSS communication link and spectrum-impact-smoothed channel sets implementing channel resynchronization and abbreviated acknowledgments
CN105144629B (zh) 用于无线网络的多播优化介质访问方法
GB2526839A (en) Method of contending for access to a communication channel and associated communication device
US11647535B2 (en) Wireless transmitting device and wireless transmitting method
JP5376886B2 (ja) 無線送信装置、プログラム及び方法
JP2008199473A (ja) 無線通信装置
JP5739974B2 (ja) 通信装置および通信方法
JP6089060B2 (ja) 通信装置および通信方法
JP5443630B2 (ja) 通信装置
TW201246999A (en) Method and system for medium access with reduced power consumption for constrained wireless devices
JP2014150419A (ja) 無線アクセス制御方法および無線通信装置
KR20170122040A (ko) 메시 네트워크의 중계 노드 및 중계처리 방법
JP2017011530A (ja) 通信装置、通信方法及びプログラム
JP2001144776A (ja) 無線パケット通信システム及び方法
JP2011166526A (ja) 通信装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18945086

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2020562274

Country of ref document: JP

Kind code of ref document: A

ENP Entry into the national phase

Ref document number: 20217018328

Country of ref document: KR

Kind code of ref document: A

122 Ep: pct application non-entry in european phase

Ref document number: 18945086

Country of ref document: EP

Kind code of ref document: A1