WO2013146424A1 - 通信システム、通信方法、通信システムにおける無線装置、および通信システムにおける端末装置で実行されるプログラム - Google Patents
通信システム、通信方法、通信システムにおける無線装置、および通信システムにおける端末装置で実行されるプログラム Download PDFInfo
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- WO2013146424A1 WO2013146424A1 PCT/JP2013/057676 JP2013057676W WO2013146424A1 WO 2013146424 A1 WO2013146424 A1 WO 2013146424A1 JP 2013057676 W JP2013057676 W JP 2013057676W WO 2013146424 A1 WO2013146424 A1 WO 2013146424A1
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- frame
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/27—Transitions between radio resource control [RRC] states
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to a communication system, a communication method, a wireless device in the communication system, and a program executed by a terminal device in the communication system.
- Non-Patent Document 1 a home network that shifts a server from a sleep state to a start state with low power consumption.
- This home network includes a client terminal, a proxy, and a server.
- the proxy is arranged between the client terminal and the server.
- the client terminal can directly communicate with the server, and can communicate with the server via a proxy.
- the client terminal When the server is in the sleep state, the client terminal transmits a proxy activation signal to the proxy.
- the proxy receives a proxy activation signal from the client terminal, and converts the received proxy activation signal into an activation signal. Then, the proxy transmits the converted activation signal to the server. Then, the server shifts from the sleep state to the activated state in response to the activation signal from the proxy.
- Non-Patent Document 1 since the proxy converts the proxy activation signal into the activation signal in the application layer, there is a problem that the activation signal cannot be transferred to the existing access point in the proxy.
- an object of the present invention is to provide a communication system that shifts a wireless device from a sleep state to an activated state via an existing access point.
- Another object of the present invention is to provide a communication method for shifting a wireless device from a sleep state to an active state via an existing access point.
- Another object of the present invention is to provide a wireless device in a communication system that shifts a wireless device from a sleep state to an activated state via an existing access point.
- Another object of the present invention is to provide a program executed by a terminal device in a communication system that shifts a wireless device from a sleep state to an activated state via an existing access point.
- the communication system includes a terminal device and first and second radio devices.
- the terminal device sequentially transmits at least one frame having a desired frame length constituting an identifier of the wireless device to be shifted from the sleep state to the activated state by wired communication or wireless communication.
- the first radio apparatus sequentially receives at least one frame from the terminal apparatus, and sequentially transmits at least one radio frame having at least one frame length of the received at least one frame in the IP layer or the MAC layer. To transfer at least one frame.
- the second radio apparatus sequentially receives at least one radio frame transferred by the first radio apparatus, detects at least one frame length of the received at least one radio frame, and detects the detected at least one radio frame When the identifier obtained by decoding the frame length matches its own identifier, the sleep state is shifted to the activated state.
- the communication method is such that the terminal device transmits at least one frame having a desired frame length constituting the identifier of the wireless device that the terminal device wants to transition from the sleep state to the active state by wired communication or A first step of sequentially transmitting by wireless communication; and at least one radio in which the first radio apparatus sequentially receives at least one frame from the terminal apparatus and has at least one frame length of the received at least one frame.
- the wireless device includes a receiving means, a detecting means, and a control means.
- the receiving means transfers at least one frame having a desired frame length that constitutes an identifier of the wireless device that is transmitted from the terminal device and that is to be shifted from the sleep state to the activated state, as at least one wireless frame.
- At least one radio frame is received.
- the detecting means detects at least one frame length of at least one radio frame received by the receiving means.
- the control unit activates the wireless device from the sleep state to the activated state. Is generated.
- the program for causing the computer to execute is a program for causing the computer to execute the operation of the terminal device in the communication system according to claim 1 and is activated from the sleep state.
- a computer is caused to execute a first step of sequentially transmitting at least one frame having a desired frame length constituting an identifier of a wireless device to be shifted to a state by wired communication or wireless communication.
- the terminal device transmits at least one frame generated by frame length modulating the identifier of the second wireless device, and the first wireless device transmits from the terminal device.
- the at least one frame is transferred to the second wireless device at the IP layer or the MAC layer.
- the second wireless device shifts to the activated state.
- the first wireless device transfers at least one frame using the function of the existing access point as it is.
- the second wireless device can be shifted to the activated state via the existing access point.
- At least one frame generated by frame length modulating the identifier of the second radio apparatus is transmitted from the terminal apparatus to the first radio apparatus, and at least one frame is transmitted.
- the frame is transferred to the second wireless device at the IP layer or MAC layer of the first wireless device.
- at least one frame is decoded into an identifier, and when the decoded identifier matches the identifier of the second wireless device, the second wireless device shifts to an activated state.
- at least one frame is transferred using the function of an existing access point.
- the second wireless device can be shifted to the activated state via the existing access point.
- the wireless device includes at least one frame having a desired frame length that is transmitted from the terminal device and that constitutes an identifier of the wireless device that is to be shifted from the sleep state to the active state.
- At least one radio frame is received from a transfer apparatus that transfers as one radio frame, and at least one frame length of the received at least one radio frame is detected. Then, when the identifier obtained by decoding the detected at least one frame length matches the identifier of the wireless device, the wireless device generates an activation signal for shifting itself from the sleep state to the activation state.
- the wireless device can be shifted to the activated state via the existing transfer device (access point).
- the program according to the embodiment of the present invention has at least one frame length having a desired frame length constituting an identifier of a wireless device to be shifted from the sleep state to the active state.
- a computer is caused to execute a first step of sequentially transmitting frames by wired communication or wireless communication.
- at least one frame is transferred as at least one radio frame by the first radio device, and at least one radio frame is received by the second radio device and decoded into an identifier. Then, when the decoded identifier matches the identifier of the second wireless device, the second wireless device transitions to the activated state.
- the second wireless device can be shifted to the activated state via the existing access point.
- FIG. 1 is a schematic diagram of a communication system according to an embodiment of the present invention. It is a block diagram of the terminal device shown in FIG. It is a block diagram of the access point shown in FIG. It is a block diagram of the radio
- FIG. 3 is a flowchart for explaining an operation in the communication system shown in FIG. 1.
- 4 is another flowchart for explaining the operation in the communication system 10 shown in FIG. 1.
- 6 is still another flowchart for explaining an operation in the communication system shown in FIG. 1.
- 6 is still another flowchart for explaining an operation in the communication system shown in FIG. 1.
- FIG. 1 is a schematic diagram of a communication system according to an embodiment of the present invention.
- a communication system 10 according to an embodiment of the present invention includes a terminal device 1, an access point 2, and a wireless device 3.
- the identifier of the wireless device 3 is configured with a plurality of frame lengths, and a plurality of frames having a plurality of frame lengths are accessed by wired communication or wireless communication Sequentially transmit to point 2.
- the access point 2 receives a plurality of frames from the terminal device 1 and transmits a plurality of radio frames according to a CSMA / CA (Carrier Sense Multiple Access / Collision Avoidance) scheme so as to have a plurality of frame lengths of the received plurality of frames. Broadcast or unicast sequentially to the wireless device 3.
- CSMA / CA Carrier Sense Multiple Access / Collision Avoidance
- the access point 2 determines a transmission rate and broadcasts or unicasts a plurality of radio frames.
- the wireless device 3 belongs to the access point 2.
- the wireless device 3 sequentially receives a plurality of wireless frames from the access point 2 and detects a plurality of frame lengths of the received plurality of wireless frames. Then, the wireless device 3 decodes a plurality of frame lengths into identifiers, and shifts from the sleep state to the activated state when the decoded identifiers coincide with its own identifier.
- FIG. 2 is a block diagram of the terminal device 1 shown in FIG. With reference to FIG. 2, the terminal device 1 includes an antenna 11, a wireless module 12, a wired module 13, and a host system 14.
- the wireless module 12 receives from the host system 14 an instruction signal COM1 for shifting the wireless device 3 from the sleep state to the activated state and the identifier of the wireless device 3. Then, the wireless module 12 generates a plurality of frame lengths indicating the identifier of the wireless device 3 by a method described later according to the instruction signal COM1, and includes a header made up of a broadcast address and a plurality of frames having a plurality of frame lengths. Are sequentially transmitted to the access point 2 via the antenna 11.
- the wireless module 12 sequentially transmits a plurality of frames according to the CSMA / CA method.
- the wireless module 12 determines the frame length based on the payload size and the transmission rate, and sequentially transmits a plurality of frames.
- the wired module 13 is connected to the wired cable 20.
- the wired module 13 receives the instruction signal COM ⁇ b> 1 and the identifier of the wireless device 3 from the host system 14. Then, the wired module 13 generates a plurality of frame lengths indicating the identifier of the wireless device 3 by a method described later according to the instruction signal COM1, and includes a header made up of a broadcast address and a plurality of frames having a plurality of frame lengths. Are sequentially transmitted to the access point 2 via the wired cable 20.
- the wired module 13 determines the frame length based on the payload size and the transmission rate, and sequentially transmits a plurality of frames.
- the host system 14 holds the identifier of the wireless device 3. Then, the host system 14 outputs the instruction signal COM1 and the identifier of the wireless device 3 to the wireless module 12 or the wired module 13 when the wireless device 3 is shifted from the sleep state to the activated state.
- FIG. 3 is a block diagram of the access point 2 shown in FIG. Referring to FIG. 3, access point 2 includes an antenna 21, a wireless module 22, a wired module 23, transfer means 24 and 25, and a host system 26.
- the wireless module 22 sequentially receives a header and a plurality of frames from the terminal device 1 via the antenna 21 and transfers the received header and the plurality of frames according to an instruction signal from the host system 26. Output to. More specifically, when receiving the instruction signal COM2 from the host system 26, the wireless module 22 outputs a header and a plurality of frames to the transfer unit 24. When receiving the instruction signal COM3 from the host system 26, the wireless module 22 receives the header and the plurality of frames. The frame is output to the transfer means 25.
- the radio module 22 receives a header and a plurality of frame lengths from the transfer unit 24 or the transfer unit 25, and converts the received header and a plurality of radio frames having a plurality of frame lengths into the antenna 21 according to the CSMA / CA system. Via broadcast or unicast.
- the wired module 23 sequentially receives the header and the plurality of frames from the terminal device 1 via the wired cable 20, and transfers the received header and the plurality of frames according to the instruction signals COM ⁇ b> 2 and COM ⁇ b> 3 from the host system 26. 24 or the transfer means 25.
- the transfer means 24 is arranged in a MAC (Media Access Control) layer and operates in a bridge mode. Then, the transfer unit 24 receives a header and a plurality of frames from the wireless module 22.
- MAC Media Access Control
- the transfer unit 24 detects a plurality of frame lengths of the plurality of frames, and outputs the detected plurality of frame lengths and the header received from the wired module 23 to the wireless module 22.
- the transfer unit 24 when unicasting a plurality of frames to the wireless device 3, the transfer unit 24 generates a header including the MAC address of the wireless device 3 and detects a plurality of frame lengths of the plurality of frames. The length is output to the wireless module 22.
- the transfer unit 24 When the transfer unit 24 operates in the bridge mode, the transfer unit 24 knows that the wireless device 3 belongs to the access point 2 and thus knows the MAC address of the wireless device 3. Accordingly, the transfer unit 24 can generate a header including the MAC address of the wireless device 3.
- the transfer unit 24 outputs the header and the plurality of frame lengths to the wireless module 22 by the same operation as described above even when the header and the plurality of frames are received from the wired module 23.
- the transfer means 25 is arranged in an IP (Internet Protocol) layer and operates in the router mode. Then, the transfer unit 25 receives a header and a plurality of frames from the wireless module 22.
- IP Internet Protocol
- the transfer unit 25 detects a plurality of frame lengths of the plurality of frames, and outputs the detected plurality of frame lengths and headers to the wireless module 22.
- the transfer unit 25 when unicasting a plurality of frames to the wireless device 3, the transfer unit 25 generates a header including the IP address of the wireless device 3, detects a plurality of frame lengths of the plurality of frames, and detects the header and the plurality of frames. The length is output to the wireless module 22.
- the transfer unit 25 When the transfer unit 25 operates in the router mode, the transfer unit 25 knows that the wireless device to be transmitted by the access point 2 is the wireless device 3, and thus knows the IP address of the wireless device 3. Therefore, the transfer unit 25 can generate a header including the IP address of the wireless device 3.
- the transfer unit 25 when receiving the header and the plurality of frames from the wired module 23, the transfer unit 25 outputs the header and the plurality of frame lengths to the wireless module 22 by the same operation as described above.
- the host system 26 When the access point 2 operates in the bridge mode, the host system 26 generates an instruction signal COM2 that indicates that the operation mode of the access point 2 is in the bridge mode, and the generated instruction signal COM2 is transmitted to the wireless module 22 and the wired system. Output to module 23.
- the host system 26 when the access point 2 operates in the router mode, the host system 26 generates an instruction signal COM3 that instructs that the operation mode of the access point 2 is the router mode, and the generated instruction signal COM3 is used as the wireless module 22. And output to the wired module 23.
- FIG. 4 is a block diagram of the wireless device 3 shown in FIG.
- the wireless device 3 includes an antenna 31, a switch 32, terminals 33 and 34, an envelope detection circuit 35, a frame length detection circuit 36, a determination circuit 37, a control circuit 38, A wireless interface 39 and a host system 40 are included.
- the switch 32 is connected to the antenna 31.
- the terminal 33 is connected to the envelope detection circuit 35.
- the terminal 34 is connected to the wireless interface 39.
- the switch 32 is connected to the terminal 33 or the terminal 34 according to the control from the control circuit 38. More specifically, the switch 32 is connected to the terminal 33 when it receives an L (logic low) level signal from the control circuit 38. Further, the switch 32 is connected to the terminal 34 when it receives an H (logic high) level signal from the control circuit 38. Then, the switch 32 receives a reception signal via the antenna 31 and outputs the received reception signal to the envelope detection circuit 35 or the wireless interface 39.
- the envelope detection circuit 35 receives the received signal from the switch 32 via the terminal 33, detects the received signal by envelope detection, and outputs the detected envelope to the frame length detection circuit 36.
- the frame length detection circuit 36 receives the envelope from the envelope detection circuit 35.
- the frame length detection circuit 36 samples the envelope at the sampling period and converts it into a digital signal sequence, detects the frame length based on the converted digital signal sequence, and sends the detected frame length to the determination circuit 37. Output.
- the determination circuit 37 receives the frame length from the frame length detection circuit 36, decodes the received frame length, and acquires the identifier. Then, the determination circuit 37 determines whether or not the acquired identifier matches the identifier of the wireless device 3.
- the determination circuit 37 outputs an activation signal to the control circuit 38 when the acquired identifier matches the identifier of the wireless device 3, and when the acquired identifier does not match the identifier of the wireless device 3, the determination circuit 37 sends the sleep signal to the control circuit. 38.
- control circuit 38 When the control circuit 38 receives the activation signal from the determination circuit 37, the control circuit 38 shifts the wireless interface 39 and the host system 40 from the sleep state to the activation state. Then, the control circuit 38 outputs an H level signal to the switch 32.
- control circuit 38 when receiving the sleep signal from the determination circuit 37, the control circuit 38 maintains the sleep state of the wireless interface 39 and the host system 40.
- the control circuit 38 detects that the wireless communication is not performed for a certain period of time, and then the wireless interface 39 and the host system 40 are switched. A transition is made from the activated state to the sleep state, and an L level signal is output to the switch 32.
- the wireless interface 39 shifts from the sleep state to the start state according to the control from the control circuit 38, or shifts from the start state to the sleep state.
- the wireless interface 39 receives a reception signal from the switch 32 via the terminal 34, demodulates and decodes the received signal, and outputs the received signal to the host system 40. Further, when receiving a transmission signal from the host system 40, the wireless interface 39 modulates the received transmission signal and transmits it via the terminal 34, the switch 32, and the antenna 31.
- the host system 40 shifts from the sleep state to the start state or shifts from the start state to the sleep state according to the control from the control circuit 38. In addition, the host system 40 receives a signal from the wireless interface 39. Further, the host system 40 generates a transmission signal and outputs the generated transmission signal to the wireless interface 39.
- the wireless interface 39 and the host system 40 stop operating, and the envelope detection circuit 35, the frame length detection circuit 36, the determination circuit 37, and the control circuit 38 are in operation.
- the state in which the envelope detection circuit 35, the frame length detection circuit 36, the determination circuit 37, the control circuit 38, the wireless interface 39, and the host system 40 are operating is referred to as a “wakeup state”.
- FIG. 5 is a diagram showing the relationship between the bit string and the frame length.
- table TBL includes a bit string and a frame length. The bit string and the frame length are associated with each other.
- the frame length of 710 ⁇ s is assigned to the bit string “0000”, the frame length of 740 ⁇ s is assigned to the bit string “0001”, the frame length of 770 ⁇ s is assigned to the bit string “0010”, and so on.
- the frame length is assigned to the bit string “1110”, and the frame length of 1160 ⁇ s is assigned to the bit string “1111”.
- the bit string “1011001011011010” is divided into 4-bit bit strings “1011”, “0010”, “1101”, “1010”.
- the frame length of 1040 ⁇ s is assigned to the bit string “1011”
- the frame length of 770 ⁇ s is assigned to the bit string “0010”
- the frame length of 1100 ⁇ s is assigned to the bit string “1101”
- the frame length of 1010 ⁇ s is assigned to the bit string “1010”. Assigned to.
- the identifier “1011001011011010” is subjected to frame length modulation to a frame length of 1040 ⁇ s / 770 ⁇ s / 1100 ⁇ s / 1010 ⁇ s.
- the host system 14 of the terminal device 1 holds a table TBL. In addition, the host system 14 holds the identifier of the wireless device 3.
- the host system 14 acquires a bit string representing the identifier of the wireless device 3. After that, the host system 14 divides the acquired bit string into 4-bit bit strings, refers to the table TBL, and assigns a frame length to each of the divided 4-bit bit strings.
- the host system 14 outputs the header HED1 including the broadcast address and the plurality of frame lengths FL to the wireless module 12 or the wired module 13.
- the host system 14 assigns a plurality of frame lengths to the bit string constituting the identifier of the wireless device 3 in the same manner, even when the identifier of the wireless device 3 is composed of a bit string other than the bit string “1011001011011010”. Are output to the wireless module 12 or the wired module 13.
- FIG. 6 is a diagram for explaining a method of transmitting a plurality of radio frames.
- a method of transmitting a plurality of radio frames will be described in the case where the identifier of the radio apparatus 3 is represented by four frame lengths 1040 ⁇ s / 770 ⁇ s / 1100 ⁇ s / 1010 ⁇ s.
- the wireless module 12 of the terminal device 1 receives the header HED1 and a plurality of frame lengths of 1040 ⁇ s / 770 ⁇ s / 1100 ⁇ s / 1010 ⁇ s from the host system 14.
- the radio module 12 performs carrier sense via the antenna 11, and when it is determined that the radio communication space is free as a result of the carrier sense, the radio frame FR1 having a header HED1 and a frame length of 1040 ⁇ s is transmitted to the antenna 11. Send through.
- the radio module 12 generates a payload Pyl1 having an arbitrary size, and transmits the radio frame FR1 by adjusting the transmission rate so that the frame length becomes 1040 ⁇ s and transmitting the payload Pyl1.
- the wireless module 12 waits for a period of DIFS (Distributed Coordination Function Inter space Space) and backoff Back off, and transmits a wireless frame FR2 having a frame length of 770 ⁇ s via the antenna 11. Also in this case, the radio module 12 generates a payload Pyl2 having an arbitrary size, and transmits the radio frame FR2 by adjusting the transmission rate so that the frame length becomes 770 ⁇ s and transmitting the payload Pyl2.
- DIFS Distributed Coordination Function Inter space Space Space Space
- the radio module 12 waits for a period of DIFS and backoff back off, and transmits a radio frame FR3 having a frame length of 1100 ⁇ s via the antenna 11. Also in this case, the radio module 12 generates a payload Pyl3 having an arbitrary size, transmits the radio frame FR3 by adjusting the transmission rate so that the frame length becomes 1100 ⁇ s, and transmits the payload Pyl3.
- the radio module 12 waits for a period of DIFS and backoff back off, and transmits a radio frame FR4 having a frame length of 1010 ⁇ s via the antenna 11. Also in this case, the radio module 12 generates a payload Pyl4 having an arbitrary size, transmits the radio frame FR4 by adjusting the transmission rate so that the frame length becomes 1010 ⁇ s, and transmits the payload Pyl4.
- the wireless module 12 waits for transmission of the header HED1 and the plurality of frames FR1 to FR4 when it is determined that the wireless communication space is not free as a result of carrier sense.
- the wireless module 12 also displays the header HED1 and the plurality of wireless frames by the above-described method even when the identifier of the wireless device 3 is represented by a plurality of frame lengths other than the four frame lengths 1040 ⁇ s / 770 ⁇ s / 1100 ⁇ s / 1010 ⁇ s. Send.
- the wired module 13 receives the header HED1 and a plurality of frame lengths 1040 ⁇ s / 770 ⁇ s / 1100 ⁇ s / 1010 ⁇ s from the host system 14.
- the wired module 13 sequentially transmits the header HED1 received from the host system 14 and a plurality of frame lengths 1040 ⁇ s / 770 ⁇ s / 1100 ⁇ s / 1010 ⁇ s to the access point 2 via the wired cable 20.
- FIG. 7 is a diagram for explaining a transfer method in the router mode.
- the access point 2 operates in the router mode
- the wireless module 22 or the wired module 23 receives the header HED1 and the plurality of frames FR1 to FR4 from the terminal device 1
- the received header HED1 and A plurality of frames FR1 to FR4 are output to the transfer means 25.
- the transfer means 25 outputs the header HED1 and the plurality of frames FR1 to FR4 to the wireless module 22 when broadcasting a plurality of wireless frames.
- the wireless module 22 When the wireless module 22 receives the header HED1 and the plurality of frames FR1 to FR4 from the transfer unit 25, the wireless module 22 performs carrier sense via the antenna 21, and when the wireless communication space is free as a result of the carrier sense, the header HED1 Then, a plurality of radio frames FR5 to FR8 having a plurality of frame lengths are broadcast via the antenna 21 by the method shown in FIG. In this case, the wireless module 22 uses a fixed transmission rate, a low transmission rate (for example, 1 Mbps) that can reach all wireless devices to which the wireless module 22 belongs, or a transmission rate at the time of the last wireless communication. Send to fixed.
- a low transmission rate for example, 1 Mbps
- the terminal device 1 transmits a plurality of frames FR1 to FR4 in advance so that the frame lengths are 1040 ⁇ s, 770 ⁇ s, 1100 ⁇ s, and 1010 ⁇ s. . Therefore, the wireless module 22 can generate payloads Pyl5 to Pyl8 having frame lengths of 1040 ⁇ s, 770 ⁇ s, 1100 ⁇ s, and 1010 ⁇ s by setting the transmission rate of the plurality of frames FR1 to FR4 to 1 Mbps. Then, the radio module 22 broadcasts a plurality of radio frames FR5 to FR8 by sequentially transmitting the payloads Pyl5 to Pyl8 at a transmission rate of 1 Mbps.
- the wireless module 22 waits for transmission of the header HED1 and the plurality of wireless frames FR5 to FR8 when the wireless communication space is not free as a result of the carrier sense.
- the transfer means 25 unicasts the radio frame, there is no ACK response from the radio device 3, and therefore the radio frame is transmitted by the unicast frame transmission method in the access point 2 described later.
- the access point 2 transfers the header HED1 and the plurality of frames FR1 to FR4 by the transfer means 25 arranged in the IP layer. That is, the access point 2 transfers the header HED1 and the plurality of frames FR1 to FR4 at the IP layer.
- the header HED1 and the plurality of frames FR1 to FR4 can be transferred without adding a new function to the conventional access point. That is, the header HED1 and the plurality of frames FR1 to FR4 can be transferred using an existing access point.
- the header HED1 and the plurality of frames FR1 to FR4 are transferred using the transmission rate fixed by the wireless module 22 of the access point 2 because the existing access point has a fixed transmission rate or attribute. This is because packets are transmitted and received at a low transmission rate (for example, 1 Mbps) that can reach all the wireless devices that are present, or fixed at the transmission rate at the time of the last wireless communication. Therefore, by transferring the header HED1 and the plurality of frames FR1 to FR4 using a fixed transmission rate, the header HED1 and the plurality of frames FR1 to FR4 can be transferred using the existing access point.
- a low transmission rate for example, 1 Mbps
- FIG. 8 is a diagram for explaining a transfer method in the bridge mode.
- the access point 2 operates in the bridge mode
- the wireless module 22 or the wired module 23 receives the header HED1 and the plurality of frames FR1 to FR4 from the terminal device 1
- the received header HED1 and A plurality of frames FR1 to FR4 are output to the transfer means 24.
- the transfer unit 24 outputs the header HED1 and the plurality of frames FR1 to FR4 to the wireless module 22 when broadcasting a plurality of wireless frames.
- the wireless module 22 Upon receiving the header HED1 and the plurality of frames FR1 to FR4 from the transfer unit 24, the wireless module 22 receives the header HED1 and a plurality of wireless frames FR5 to FR8 having a plurality of frame lengths of the plurality of frames FR1 to FR4. Broadcast by the method described above.
- the transfer unit 24 unicasts the radio frame
- the radio frame is transmitted by the transmission method.
- the access point 2 when the access point 2 operates in the bridge mode, the access point 2 transfers the header HED1 and the plurality of frames FR1 to FR4 by the transfer means 24 arranged in the MAC layer. That is, the access point 2 transfers the header HED1 and the plurality of frames FR1 to FR4 at the MAC layer.
- the header HED1 and the plurality of frames FR1 to FR4 can be transferred without adding a new function to the conventional access point. That is, the header HED1 and the plurality of frames FR1 to FR4 can be transferred using an existing access point.
- the radio module 12 of the terminal device 1 can receive the plurality of broadcast radio frames FR5 to FR8.
- the wireless module 12 of the terminal device 1 can detect the transmission rates of the plurality of wireless frames FR5 to FR8 when receiving the plurality of wireless frames FR5 to FR8.
- the wireless module 12 of the terminal device 1 when the wireless module 12 of the terminal device 1 thereafter transmits a wireless frame, the wireless module 12 determines the payload size so as to obtain a desired frame length at the detected transmission rate, and transmits the wireless frame.
- FIG. 9 is a diagram for explaining a transmission method in the access point 2.
- radio module 22 of access point 2 uses transmission rate R1 at the time of the last radio communication as described above.
- the wireless frame is transmitted to the wireless device 3.
- the wireless module 22 of the access point 2 When the wireless module 22 of the access point 2 does not receive an ACK from the wireless device 3 after transmitting the wireless frame at the transmission rate R1, the wireless module 22 transmits the wireless frame by reducing the transmission rate from the transmission rate R1 to the transmission rate R2. To do.
- the wireless module 22 of the access point 2 When the wireless module 22 of the access point 2 does not receive an ACK from the wireless device 3 after transmitting a wireless frame at the transmission rate R2, the wireless module 22 transmits the wireless frame by reducing the transmission rate from the transmission rate R2 to the transmission rate R3. To do.
- the wireless module 22 of the access point 2 does not receive an ACK from the wireless device 3 after transmitting the wireless frame, the wireless module 22 transmits the wireless frame at a reduced transmission rate.
- the transmission rates R1 to R3 are, for example, 54 Mbps, 48 Mbps, and 32 Mbps, respectively.
- the access point 2 when the access point 2 does not receive an ACK from the wireless device 3 after transmitting the wireless frame, the access point 2 transfers the wireless frame at a reduced transmission rate.
- the frame length of the wireless frame can be set to the original frame length.
- FIG. 10 is a conceptual diagram of radio signals and envelopes.
- FIG. 11 is a diagram for explaining a frame length detection method.
- the envelope detection circuit 35 receives a radio signal via the antenna 21, performs envelope detection on the received reception signal RF (see (a) of FIG. 10), and envelopes EVL (see (b) of FIG. 10). ) Is detected. Then, the envelope detection circuit 35 outputs the detected envelope EVL to the frame length detection circuit 36.
- the frame length detection circuit 36 receives the envelope EVL from the envelope detection circuit 35, compares the received envelope EVL with a threshold value, and converts the envelope EVL from an analog signal to a digital signal.
- the threshold value is set to ⁇ 82 [dBm], for example. Then, the frame length detection circuit 36 determines whether the converted digital signal is “0” or “1” in the determination cycle, and counts the number of “1”. The determination period is set to 10 ⁇ s, for example.
- a frame length decoding method in the determination circuit 37 will be described.
- the determination circuit 37 has a built-in table TBL.
- the determination circuit 37 When the determination circuit 37 receives the frame length of 1040 ⁇ s from the frame length detection circuit 36, the determination circuit 37 refers to the table TBL and converts the frame length of 1040 ⁇ s into the bit string “1011”.
- the determination circuit 37 when the determination circuit 37 receives the frame length of 770 ⁇ s from the frame length detection circuit 36, the determination circuit 37 refers to the table TBL and converts the frame length of 770 ⁇ s into the bit string “0010”.
- the determination circuit 37 converts the frame length of 1100 ⁇ s into the bit string “1101” and converts the frame length of 1010 ⁇ s into the bit string “1010”.
- the determination circuit 37 acquires an identifier composed of the bit string “1011001011011010”.
- the determination circuit 37 when the acquired bit string “1011001011011010” matches the identifier of the wireless device 3, the determination circuit 37 generates an activation signal and outputs it to the control circuit 38. On the other hand, when the acquired bit string “1011001011011010” does not match the identifier of the wireless device 3, the determination circuit 37 generates a sleep signal and outputs the sleep signal to the control circuit 38.
- the wireless device 3 is a wireless device belonging to the access point 2, but when the wireless device 3 does not perform wireless communication with the access point 2 for a certain period of time, the access point 2 assumes that the wireless device 3 does not belong to itself.
- the plurality of frames FR1 to FR4 transmitted from the terminal device 1 are not transferred. As a result, the terminal device 1 cannot shift the wireless device 3 from the sleep state to the activated state via the access point 2.
- the wireless device 3 autonomously shifts to the activated state at regular intervals (for example, 5 seconds), and transmits a NULL packet addressed to the access point 2 having no contents to the access point 2.
- the access point 2 recognizes that the wireless device 3 belongs to itself even if there is no normal wireless communication with the wireless device 3, and receives a plurality of frames FR 1 to FR 4 from the terminal device 1.
- the received plurality of frames FR1 to FR4 are transferred to the radio apparatus 3 by the method described above.
- the terminal device 1 can always shift the wireless device 3 from the sleep state to the activated state via the access point 2.
- the wireless device 3 transmits a packet including an identifier for starting itself next time to the terminal device 1 at a constant interval (for example, 5 seconds). In this case, the wireless device 3 transmits to the terminal device 1 while changing the identifier at regular intervals. That is, the wireless device 3 updates its own identifier at regular intervals.
- FIG. 12 is a flowchart for explaining the operation in the communication system 10 shown in FIG.
- terminal apparatus 1 modulates the identifier of radio apparatus 3 by frame length by the method described above, and includes header HED1 and a plurality of frames having a plurality of frame lengths. Are broadcast or unicast by wired communication or wireless communication (step S1).
- the access point 2 receives the header HED1 and a plurality of frames by wired communication or wireless communication (step S2).
- the access point 2 transfers the header HED1 and a plurality of frames by broadcast or unicast in the IP layer or MAC layer by the method described above (step S3).
- the wireless device 3 receives the header HED1 (or HED2, 3) and a plurality of wireless frames (step S4), and detects a plurality of frame lengths of the plurality of wireless frames by the method described above (step S5).
- the wireless device 3 decodes a plurality of frame lengths into identifiers by the method described above (step S6), and determines whether or not the decoded identifier matches the identifier of the wireless device 3 (step S7).
- step S7 When it is determined in step S7 that the decrypted identifier matches the identifier of the wireless device 3, the wireless device 3 transitions to an activated state (step S8).
- step S7 when it is determined in step S7 that the decrypted identifier does not match the identifier of the wireless device 3, the wireless device 3 maintains the sleep state (step S9).
- step S8 or step S9 the series of operations ends.
- FIG. 13 is another flowchart for explaining the operation of the communication system 10 shown in FIG.
- the flowchart shown in FIG. 13 is a flowchart when the access point 2 transfers a plurality of frames by unicast.
- FIG. 13 is the same as the flowchart shown in FIG. 12 except that steps S10 and S11 are added to the flowchart shown in FIG.
- terminal device 1 executes step S1 described above, and access point 2 sequentially executes steps S2 and S3 described above.
- step S3 the access point 2 transfers the header HED1 and a plurality of frames by unicast.
- step S3 the access point 2 determines whether or not an ACK is received from the wireless device 3 (step S10).
- step S10 When it is determined in step S10 that ACK has not been received from the wireless device 3, the access point 2 lowers the transmission rate and transfers the header HED1 and a plurality of frames by unicast in the MAC layer or the IP layer ( Step S11).
- step S10 steps S10 and S11 are repeatedly executed until it is determined in step S10 that an ACK has been received from the wireless device 3.
- step S10 When it is determined in step S10 that ACK has been received from the wireless device 3, the wireless device 3 sequentially executes steps S4 to S9 described above. As a result, a series of operations is completed.
- step S4 to step S9 are executed after step S11 is executed at least once, the wireless device 3 detects the frame length in consideration of the reduced transmission rate in step S5.
- the frame length detection circuit 36 of the wireless device 3 The frame length is detected by the method shown in FIG. 11, and the multiplication result obtained by multiplying the detected frame length by (48/54) is detected as the frame length.
- the frame length becomes longer by the decrease in the transmission rate. Therefore, the original frame length is detected by correcting the frame length using the decrease in the transmission rate.
- the identifier of the wireless device 3 can be accurately decoded.
- FIG. 14 is still another flowchart for explaining the operation of the communication system 10 shown in FIG.
- the flowchart shown in FIG. 14 is a flowchart when the access point 2 transfers a plurality of frames by broadcast.
- the flowchart shown in FIG. 14 is the same as the flowchart shown in FIG. 12 except that step S1 of the flowchart shown in FIG. 12 is replaced with step S1A and steps S12 and S13 are added.
- terminal apparatus 1 modulates the identifier of radio apparatus 3 by frame length by the method described above, and includes header HED1 and a plurality of frames having a plurality of frame lengths. Are broadcast by wired communication or wireless communication (step S1A). Then, the access point 2 sequentially executes steps S2 and S3 described above, and the wireless device 3 sequentially executes steps S4 to S9 described above.
- the access point 2 broadcasts the header HED1 and a plurality of frames in step S3.
- Step S3 the terminal device 1 receives the broadcasted frame and detects the transmission rate of the received frame (Step S12).
- the terminal device 1 sets the transmission rate to the detected transmission rate (step S13).
- step S1A the terminal device 1 determines a payload size so as to have a desired frame length using the set transmission rate, and broadcasts a plurality of frames.
- the terminal device 1 can immediately grasp the transmission rate by receiving the frame broadcast by the access point 2, so that the frame length of a plurality of consecutive frames is changed as intended. Easy to control.
- step S10 S11 mentioned above.
- FIG. 15 is still another flowchart for explaining the operation of the communication system 10 shown in FIG.
- the flowchart shown in FIG. 15 is obtained by adding steps S14 to S17 to the flowchart shown in FIG. 12, and is otherwise the same as the flowchart shown in FIG.
- wireless device 3 determines whether or not a certain period has elapsed (step S14), and when the certain period has elapsed, self belongs to access point 2.
- the access point 2 receives the control packet CTL (step S16), and detects that the wireless device 3 belongs to itself based on the received control packet CTL (step S17).
- Steps S14 to S17 are executed in parallel with Steps S1 to S9.
- the access point 2 can detect that the wireless device 3 belongs to itself even when normal wireless communication with the wireless device 3 is not performed, and receives a plurality of frames from the terminal device 1. Then, the received plurality of frames are transferred to the wireless device 3 (see steps S2 and S3).
- the terminal device 1 can shift the wireless device 3 to the activated state even when normal wireless communication is not performed between the access point 2 and the wireless device 3.
- the control packet CTL is generated by the host system 40 of the wireless device 3 and transmitted via the wireless interface 39 and the antenna 31.
- step S15 the identifier of the wireless device 3 may be periodically changed, and the control packet CTL including the changed identifier of the wireless device 3 may be transmitted.
- the control circuit 38 of the wireless device 3 periodically shifts the wireless interface 39 and the host system 40 to the activated state, and the host system 40 periodically changes the identifier of the wireless device 3 and changes the changed wireless device.
- a control packet CTL including the identifier of the device 3 is transmitted via the wireless interface 39 and the antenna 21.
- steps S10 and S11 described above may be added, steps S12 and S13 may be added, or steps S10 to S13 may be added.
- Step S1 shown in FIG. 12, FIG. 13 and FIG. 15 constitutes a program for causing a computer to execute the operation of the terminal device 1.
- Steps S1, S12, and S13 shown in FIG. 14 constitute a program for causing a computer to execute the operation of the terminal device 1.
- the terminal device 1 includes a CPU (Central Processing Unit) and a ROM (Read Only Memory), and the program including Step S1 and the programs including Steps S1, S12, and S13 are stored in the ROM. . Then, the CPU reads a program stored in the ROM and executes the read program. As a result, the operation of the terminal device 1 is executed.
- a CPU Central Processing Unit
- ROM Read Only Memory
- the terminal device 1 has been described as transmitting a plurality of frame lengths indicating the identifier of the wireless device 3 with a fixed transmission rate.
- the terminal device 1 is not limited thereto. May transmit a plurality of frame lengths indicating the identifier of the wireless device 3 at a determined transmission rate.
- the terminal device 1 has been described as transmitting a plurality of frames having a plurality of frame lengths indicating the identifier of the wireless device 3 by wired communication or wireless communication.
- the terminal device 1 may transmit at least one frame having a desired frame length indicating the identifier of the wireless device 3 by wired communication or wireless communication.
- the access point 2 receives at least one frame from the terminal device 1 and transfers the received at least one frame by the method described above, and the wireless device 3 transmits at least one frame transferred by the access point 2.
- an identifier is obtained by decoding at least one frame length of the received at least one radio frame, and when the obtained identifier matches its own identifier, a transition is made from a sleep state to an activated state. .
- the terminal device 1 may transmit at least one frame indicating the identifier of the wireless device 3 by a broadcast frame that can be received by itself.
- the broadcast frame is a broadcast frame or a multicast frame.
- the access point 2 transmits the radio frame at a reduced transmission rate when it does not receive the ACK from the radio apparatus 3 after transmitting the radio frame.
- the present invention is not limited to this, and when the access point 2 does not receive an ACK from the wireless device 3 after transmitting the wireless frame, the access point 2 may transfer the wireless frame by changing the transmission rate. That is, when the access point 2 does not receive an ACK from the wireless device 3 after transmitting the wireless frame, the access point 2 increases or decreases the transmission rate and transfers the wireless frame.
- the radio device 3 corrects at least one frame length of the received at least one radio frame in consideration of the change in the transmission rate, When the identifier obtained by decoding the corrected at least one frame length matches its own identifier, the sleep state is shifted to the activated state.
- the wireless device 3 is not limited to this, and the wireless device 3 may transmit an arbitrary frame indicating that the wireless device 3 belongs to the access point 2 to the access point 2 after a certain period of time has elapsed. .
- the wireless device 3 has been described as updating its own identifier at regular intervals. However, in the embodiment of the present invention, the wireless device 3 is not limited to this, and the wireless device 3 may update its own identifier at an arbitrary interval. You may update with
- the wireless device 3 has been described as detecting envelopes of radio waves received by an envelope.
- the radio device 3 is not limited to this, and the radio devices 3 receive radio waves received from radio frames. Synchronous detection or regenerative detection may be performed.
- the wireless device 3 includes a synchronous detection circuit or a regenerative detection circuit instead of the envelope detection circuit 35.
- the present invention is applied to a communication system, a communication method, a wireless device in the communication system, and a program executed by a terminal device in the communication system.
Abstract
Description
大山他,"超低消費電力Wake-up ICを用いたUPnPホームネットワークの実装",ソサエティ大会,Sep,2011.
Claims (16)
- スリープ状態から起動状態へ移行させたい無線装置の識別子を構成する所望のフレーム長を有する少なくとも1つのフレームを有線通信または無線通信で順次送信する端末装置と、
前記少なくとも1つのフレームを前記端末装置から順次受信し、その受信した少なくとも1つのフレームの少なくとも1つのフレーム長を有する少なくとも1つの無線フレームを送信することによって前記少なくとも1つのフレームを転送する第1の無線装置と、
前記第1の無線装置によって転送された少なくとも1つの無線フレームを順次受信し、その受信した少なくとも1つの無線フレームの少なくとも1つのフレーム長を検出し、その検出した少なくとも1つのフレーム長を復号して得られた識別子が自己の識別子に一致するとき、スリープ状態から起動状態へ移行する第2の無線装置とを備える通信システム。 - 前記端末装置は、前記第1の無線装置が伝送レートを固定して前記少なくとも1つのフレームを転送するとき、前記第1の無線装置が用いる伝送レートに基づいて所望のフレーム長になるように前記少なくとも1つのフレームを順次送信する、請求項1に記載の通信システム。
- 前記端末装置は、前記第1の無線装置によって転送された無線フレームを受信し、その受信した無線フレームの伝送レートを検出し、その検出した伝送レートで所望のフレーム長になるようにペイロードサイズを決定して前記少なくとも1つのフレームを順次送信する、請求項1に記載の通信システム。
- 前記端末装置が送信する前記少なくとも1つのフレームは、前記端末装置も受信可能な同報フレームである、請求項3に記載の通信システム。
- 前記第1の無線装置は、前記無線フレームの送信後、前記第2の無線装置から応答がないとき、伝送レートを変化させて前記無線フレームを転送し、
前記第2の無線装置は、検出したフレーム長を伝送レートの変化分を加味して補正したフレーム長を求め、前記補正したフレーム長を復号して得られた識別子が自己の識別子に一致するとき、スリープ状態から起動状態へ移行する、請求項1に記載の通信システム。 - 前記第1の無線装置は、伝送レートを低下させて前記無線フレームを転送し、
前記第2の無線装置は、検出したフレーム長を伝送レートの低下分を加味して補正したフレーム長を求める、請求項5に記載の通信システム。 - 前記第2の無線装置は、前記第1の無線装置に帰属していることを示す任意のフレームを任意の周期で前記第1の無線装置へ送信する、請求項1に記載の通信システム。
- 前記第2の無線装置の識別子は、任意の周期で更新される、請求項1に記載の通信システム。
- 端末装置が、スリープ状態から起動状態へ移行させたい無線装置の識別子を構成する所望のフレーム長を有する少なくとも1つのフレームを有線通信または無線通信で順次送信する第1のステップと、
第1の無線装置が、前記少なくとも1つのフレームを前記端末装置から順次受信し、その受信した少なくとも1つのフレームの少なくとも1つのフレーム長を有する少なくとも1つの無線フレームを送信することによって前記少なくとも1つのフレームを転送する第2のステップと、
第2の無線装置が、前記第1の無線装置によって転送された少なくとも1つの無線フレームを順次受信し、その受信した少なくとも1つの無線フレームの少なくとも1つのフレーム長を検出し、その検出した少なくとも1つのフレーム長を復号して得られた識別子が自己の識別子に一致するとき、スリープ状態から起動状態へ移行する第3のステップとを備える通信方法。 - 端末装置から送信され、かつ、スリープ状態から起動状態へ移行させたい当該無線装置の識別子を構成する所望のフレーム長を有する少なくとも1つのフレームを少なくとも1つの無線フレームとして転送する転送装置から前記少なくとも1つの無線フレームを受信する受信手段と、
前記受信手段によって受信された少なくとも1つの無線フレームの少なくとも1つのフレーム長を検出する検出手段と、
前記検出手段によって検出された少なくとも1つのフレーム長を復号して得られた識別子が当該無線装置の識別子に一致するとき、当該無線装置をスリープ状態から起動状態へ移行させるための起動信号を生成する制御手段とを備える無線装置。 - 一定期間が経過すると、当該無線装置が前記転送装置に帰属することを示す任意のフレームを前記転送装置へ送信する送信手段を更に備える、請求項10に記載の無線装置。
- 前記送信手段は、更に、当該無線装置の識別子を任意の周期で更新し、その更新した識別子を前記端末装置へ送信する、請求項11に記載の無線装置。
- 前記検出手段は、前記少なくとも1つの無線フレームの伝送レートの変化分を加味して少なくとも1つのフレーム長を検出する、請求項10に記載の無線装置。
- 前記検出手段は、前記少なくとも1つの無線フレームの伝送レートの低下分を加味して少なくとも1つのフレーム長を検出する、請求項13に記載の無線装置。
- 請求項1に記載の通信システムにおける前記端末装置の動作をコンピュータに実行させるためのプログラムであって、
スリープ状態から起動状態へ移行させたい無線装置の識別子を構成する所望のフレーム長を有する少なくとも1つのフレームを有線通信または無線通信で順次送信する第1のステップをコンピュータに実行させるためのプログラム。 - 前記第1の無線装置によって転送された無線フレームを受信し、その受信した無線フレームの伝送レートを検出する第2のステップを更にコンピュータに実行させ、
前記第1のステップにおいて、前記少なくとも1つのフレームは、前記第2のステップで検出された伝送レートで順次送信される、請求項15に記載のコンピュータに実行させるためのプログラム。
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