WO2005117354A1 - 無線通信方法および無線通信装置 - Google Patents
無線通信方法および無線通信装置 Download PDFInfo
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- WO2005117354A1 WO2005117354A1 PCT/JP2005/009849 JP2005009849W WO2005117354A1 WO 2005117354 A1 WO2005117354 A1 WO 2005117354A1 JP 2005009849 W JP2005009849 W JP 2005009849W WO 2005117354 A1 WO2005117354 A1 WO 2005117354A1
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Classifications
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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
- H04W52/0245—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal according to signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/7163—Spread spectrum techniques using impulse radio
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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
- 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
- H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
- H04W52/0274—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by switching on or off the equipment or parts thereof
- H04W52/028—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by switching on or off the equipment or parts thereof switching on or off only a part of the equipment circuit blocks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
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- 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
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
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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 wireless communication method and a wireless communication apparatus when performing ad hoc communication in a wireless communication network.
- FIG. 22 shows a wireless communication method described in Japanese Patent Application Publication No. 2003-229869.
- the wireless communication apparatus sets a notification period of management information at predetermined time intervals, and manages the reception timing information indicating the information reception start position of its own, reception window information, and reception period information.
- Send information The other wireless communication device that has received the management information stores the reception timing, the reception window, and the reception cycle in association with the communication device number of the corresponding wireless communication device.
- the reception start position in the corresponding communication device is obtained from the reception timing and reception window of the communication partner, and the reception cycle, and the information is transmitted at that timing.
- FIG. 21 is a block diagram showing the configuration of the wireless communication device described in Japanese Patent Laid-Open No. 2004-128616.
- the conventional radio communication apparatus is provided with a narrow band radio 2002 using an ad hoc network system and an antenna 2001 in addition to a pulse radio 2004 and an antenna 2003 for pulse communication.
- the wireless communication device 2002 is used to transmit and receive control data such as requests between wireless communication terminals.
- the conventional wireless communication apparatus updates the schedule information for data communication, and performs data communication using the pulse communication method according to the schedule information.
- the narrow band wireless device is in a standby state depending on whether the wireless communication device is around or not, but the pulse wireless device is always It is working. For this reason, it is difficult for the conventional wireless communication device to reduce power consumption.
- An object of the present invention is to provide a wireless communication method capable of avoiding a collision of communication with another wireless communication device while further reducing power consumption in a reception waiting state of the wireless communication device, and a transmitting device , A receiving device, and a wireless communication device.
- the wireless communication method of the present invention is a channel in which the first wireless communication device and the second wireless communication device perform data communication, and in addition to the first channel which is initially in the sleep state, It is necessary to have a second channel that can always communicate with lower power consumption than the first channel, and the first wireless communication device transmits control information to the second wireless communication device on the second channel. Transmitting at a second channel, the second wireless communication apparatus receiving its control information on the second channel, and activating data reception on the first channel, the first wireless communication apparatus and the second wireless communication apparatus. Resuming reception on the first channel after the communication apparatus transmits and receives data on the first channel.
- the second wireless communication apparatus can achieve low power consumption by using the second channel with lower power consumption during the data standby time.
- the first wireless communication apparatus and the second communication apparatus in the wireless communication method of the present invention are UWB wireless communication apparatuses
- the first channel is a broadband transmission path
- the second channel is a modulation / demodulation speed. Is a narrow band transmission path equal to or less than a predetermined value.
- the modulation rate of the second channel is slower than that of the first channel
- the first to third wireless communication devices can reduce the power consumption at the time of communication on the second channel on the first channel. It can be lower than the power consumption.
- control information of the wireless communication method of the present invention further includes communication time reservation request information in which a time zone for data transmission is described, and the control information received by the second wireless communication apparatus is When the communication time reservation request information contained is addressed to the self, communication time reservation response information in which information notifying that the communication reservation addressed to the self is received is added to the communication time reservation request information is channel 2 using channel 2 And a third wireless communication apparatus located in a communicable range between the first wireless communication apparatus and at least one of the first wireless communication apparatus, and the communication time reservation from the first wireless communication apparatus. At least one of request information and communication time reservation response information from the second wireless communication apparatus is received on the second channel, and transmission of the time zone described in communication time reservation request information or communication time reservation response information is prohibited.
- the first wireless communication device communicating Data is transmitted using the second channel in the time zone specified in the time reservation request information.
- the wireless communication device that has received the communication time reservation information transmits a response including the reserved communication time information to the surroundings, so the wireless communication device in the communicable area of the wireless communication device for which communication was requested. Can know the time zone when the communication is reserved.
- the second wireless communication apparatus may request the first wireless communication apparatus to transmit communication time reservation request information using the second channel. And the first wireless communication apparatus transmits control information on either the first channel or the second channel in response to a request for the second wireless communication apparatus power.
- the second wireless communication apparatus can notify other wireless communication apparatuses in advance that the second channel can be used, so that it is possible to receive on the second channel which can be received with low power consumption. Become.
- the first wireless communication apparatus further performs multicasting to the second wireless communication apparatus on the second channel. [0019]
- the first wireless communication apparatus can notify all wireless communication apparatuses of communication time reservation information with low power consumption.
- a receiving apparatus includes a first receiving unit that receives a preamble on a narrowband channel that can always be received, a second receiving unit that can receive data on a UWB channel and can save power, and a first receiving unit
- the communication data selection unit controls the power saving of the second reception unit when the preamble is received, and the communication data selection unit puts the second reception unit in the power save state, and the preamble is received from the first reception unit.
- it cancels the power save of the second receiver and performs data reception from the UWB channel.
- the receiver according to the present invention puts the second receiver using the UWB channel in the power saving state except when performing data communication, and communicates with less power consumption than the UWB channel during the other time. It will keep waiting for preamble reception on possible narrowband channels. This makes it possible to reduce the total power consumption of the receiver performing UWB communication. Also, the receiver of the present invention can be adapted to any protocol regardless of the communication system.
- a receiving apparatus comprises a first receiving unit for receiving control information on a narrow band channel that can always be received, a second receiving unit for receiving data on a UWB channel, and capable of saving power;
- the communication data sorting unit controls the power saving of the second receiving unit.
- the communication data sorting unit has a communication data sorting unit that determines whether the self-addressing capability is not or not from the control information received by the receiving unit and controls power saving of the second receiving unit. In the state, when the control information addressed to the first receiver unit itself is received, the power saving of the second receiver unit is canceled and data is received from the UWB channel.
- the second receiver using the UWB channel is put in the power saving state except when performing data communication, and the control information can be transmitted via the narrowband channel that can communicate with lower power consumption than the UWB channel. I will keep waiting for reception. This makes it possible to reduce the total power consumption of the receiver that performs UWB communication.
- the transmission apparatus of the present invention outputs a control information pulse generation unit that outputs control information as a pulse with a wide pulse width, and transmission data as a pulse with a narrower pulse width than the control information pulse generation unit.
- a data pulse generation unit an oscillation unit outputting an oscillation signal according to the pulse width of a pulse input from the control information pulse generation unit and the data pulse generation unit;
- the output band is switched by outputting a signal of the UWB channel.
- the transmission apparatus of the present invention can switch the output band with a simple configuration.
- a wireless communication apparatus comprises a first receiving unit for receiving control information on a narrowband channel that can always be received, a second receiving unit for receiving data on a UWB channel, and that can save power. And a communication data sorting unit that controls power saving of the second receiving unit by determining whether or not it is addressed to itself from the control information received by the first receiving unit, the communication data sorting unit receiving the second reception Unit is put into a power saving state, and when the control information addressed to the self is received from the first receiving unit, the power saving of the second receiving unit is canceled and the receiving apparatus for performing channel power data reception of the UWB; A control information pulse generating unit for outputting the pulse as a pulse having a wide pulse width, a data pulse generating unit for outputting the transmission data as a pulse having a narrower pulse width than the control information pulse generating unit, and the control information pulse generating unit Part and data pulse And an oscillation unit that outputs an oscillation signal according to the pulse width of the pulse input from the generation unit, and a transmission unit
- control information generated by the wireless communication apparatus of the present invention includes communication time reservation request information in which a time zone for transmitting data of the transmission source wireless communication apparatus is described, and the receiving apparatus receives the communication time.
- a communication information analysis unit that extracts an identifier of a transmission source wireless communication device and a reservation time zone of data transmission from reservation request information, and when the communication information analysis unit is the destination of control data, the identifier and the reservation Communication reservation table that associates and records with the time zone of communication and communication time reservation that adds information to notify normal reception to communication time reservation request information
- a response information generation unit for generating response information wherein the control information pulse generation unit of the transmission device generates a pulse based on the communication time reservation response information generated by the response information generation unit, and the oscillation unit generates the pulse.
- a narrow band channel signal is generated in response to the pulse.
- the wireless communication device that has received the communication time reservation information transmits a response including the reserved communication time information to the surroundings, so the wireless communication device in the communicable area of the wireless communication device for which the communication request has been made. Can know the time zone when the communication is reserved.
- the communication data sorting unit can receive the UWB channel only in the reserved time zone of the data transmission addressed to itself.
- the time zone in which the UWB channel is used can be limited to a minimum, and power consumption can be further reduced.
- the narrow band channel is a channel in which the modulation / demodulation rate is set to a value or less predetermined.
- the power consumption in the narrow band channel can be suppressed to the specified value or less.
- the transmitting apparatus can switch the band of the output signal with a simple configuration, and the receiving apparatus can receive the carrier sense signal in a low power consumption state. Furthermore, multiple wireless communication devices can communicate wirelessly without interfering with each other.
- FIG. 1 is a diagram showing a configuration of a wireless communication network in a first embodiment of the present invention.
- FIG. 2 is a diagram showing the configuration of a wireless communication apparatus according to Embodiment 1 of the present invention.
- FIG. 3 is a diagram showing an RTS frame format according to Embodiment 1 of the present invention.
- FIG. 4 is a diagram showing a CTS frame format in Embodiment 1 of the present invention.
- FIG. 5 is a diagram showing a keep alive frame format in the first embodiment of the present invention.
- FIG. 6 is a diagram showing a data frame format in Embodiment 1 of the present invention.
- FIG. 7 is a diagram showing a communication sequence between wireless communication devices in the first embodiment of the present invention.
- FIG. 8 is a diagram showing a communication prohibition table in the first embodiment of the present invention.
- FIG. 9 is a diagram showing a communication reservation table according to the first embodiment of the present invention.
- FIG. 10 is a flowchart showing an operation of the radio communication apparatus according to Embodiment 1 of the present invention to transmit an RTS frame.
- FIG. 11 is a flow chart showing reception operation performed by the wireless communication device in the first embodiment of the present invention.
- FIG. 12 is a flowchart showing CTS frame processing performed by the wireless communication device in the first embodiment of the present invention.
- FIG. 13 is a flow chart showing RTS frame processing performed by the wireless communication device in the first embodiment of the present invention.
- Fig. 14 is a diagram showing the configuration of a wireless communication apparatus according to a second embodiment of the present invention.
- FIG. 15 is a diagram showing the configuration of a wireless communication apparatus according to a fourth embodiment of the present invention.
- FIG. 16 is a diagram showing the configuration of a wireless communication apparatus according to a fourth embodiment of the present invention.
- FIG. 17 is a flowchart showing a transmission process performed by the radio communication apparatus on the transmitting side in the third embodiment of the present invention.
- FIG. 18 is a flow chart showing reception processing performed by the wireless communication apparatus on the receiving side in the third embodiment of the present invention.
- FIG. 19 is a diagram showing a keepalive frame format according to Embodiment 2 of the present invention.
- FIG. 20A is a diagram showing a configuration of a transmitting apparatus in a third embodiment of the present invention.
- FIG. 20B is a diagram showing a configuration of a transmission apparatus in Embodiment 3 of the present invention.
- FIG. 21 is a block diagram showing a configuration of a wireless communication apparatus in a conventional example.
- FIG. 22 is a diagram showing a wireless communication method in the conventional example.
- FIG. 1 is a diagram showing the configuration of a wireless communication network according to an embodiment of the present invention.
- wireless communication devices 101 to 104 perform ultra-wide band (UWB) wireless communication of a multi-access scheme with other wireless communication devices in communicable areas 111 to 114, respectively. Data is transmitted on the UWB channel to the entire communicable area by the antenna. Note that the wireless communication devices 101 to 104 can freely move in space.
- UWB ultra-wide band
- FIG. 2 is a block diagram showing the configuration of the wireless communication devices 101 to 104. As shown in FIG.
- the receiving unit 201 converts an analog signal received from the antenna 200 into a digital signal to generate a frame, and is always in a receivable state.
- the transmission unit 211 converts a digital signal frame into an analog signal, and transmits the analog signal from the antenna 200.
- the antenna 200 is a nondirectional antenna and emits radio waves into a communicable area.
- the communication data selection unit 202 receives the type of frame received by the reception unit 201 from the antenna 200. To determine the type. As types of frames to be received, communication request RTS frame (hereinafter referred to as "RTS frame”), communication confirmation signal CTS (hereinafter referred to as “CTS frame”), communication non-confirmation signal nCTS (hereinafter referred to as “nCTS frame” ), Data frames, keep alive frames, etc.
- RTS frame communication confirmation signal CTS
- nCTS frame communication non-confirmation signal
- FIG. 3 shows the RTS frame format!
- a frame control 301 is identification information of a frame, and a code unique to the RTS frame is set.
- An occupied time 302 indicates an allowance time for receiving and accepting a CTS frame which is a response signal of the RTS frame.
- the transmitting station ID 303 identifies the wireless communication device of the transmission source, and has a MAC address set.
- the receiving station ID 304 identifies the transmission destination, and the MAC address of the wireless communication apparatus of the transmission destination is set.
- the number of entries 305 indicates the number of data transmission time slots to be reserved, and the frame ID 306 identifies an RTS frame.
- the transmission start time 307 and the transmission occupation time 308 indicate the time until transmission start of the data frame at the CTS reception time point and the time occupied by the communication.
- the collision bit (CO) 309 is not used in force RTS frames which indicate a collision.
- the channel number (C H) 310 is for specifying a channel used for data frame communication.
- Figure 4 shows the frame format of CTS and nCTS frames!
- the reception start time 401 and the reception exclusive time 402 of the CTS frame in FIG. 4 indicate the time until the transmission start of the data frame notified by the RTS frame and the time occupied by the transmission.
- the nCTS frame it indicates the time from the point of time of CTS transmission that permits reception specified by the wireless communication apparatus on the receiving side to the start of reception of the data frame and the time that can be occupied by the reception.
- the collision bit (CO) 309 of the CTS frame is a time zone overlapping with the communication prohibited time zone acquired from another wireless communication device and the communication reservation time zone specified in the RTS frame. Do not use the collision bit for nCTS frames.
- the frame ID 306 identifies the received RTS frame for response. Note for frame control 301, different identification codes are used for the CTS frame and the nCTS frame.
- FIG. 5 shows the format of the keepalive frame!
- a code for identifying a keepalive frame is set.
- the transmission station ID 501 is an identifier for identifying the wireless communication apparatus of the transmission source, and the MAC address is set.
- the transmission time 502 indicates the transmission time of the keepalive frame, and the transmission interval time 503 indicates the transmission cycle.
- PS 504 indicates that the wireless communication device is in a power save state.
- Figure 6 shows the format of the data frame!
- a transmitting station ID 303 identifies a wireless communication device as a data transmission source.
- the origination station ID 601 identifies a wireless communication device relaying data.
- the receiving station ID 304 identifies a wireless communication device to which data is to be relayed, and the destination station ID 602 identifies a wireless communication device to which data is to be ultimately transmitted.
- the MAC addresses of the wireless communication devices are set.
- the communication data sorting unit 202 links the data frame of the type as described above to the frame control unit 301.
- the communication information analysis unit 204 extracts the transmission station ID 303, the transmission start time 307, and the transmission occupancy time 308 when the communication data selection unit 202 selects the RTS frame, and the communication inhibition table 205 It is to register. Also, when the communication data analysis unit 204 selects the CTS frame by the communication data selection unit 202, if the transmission station ID of the CTS frame is not its own MAC address, the transmission station ID 303, reception start time 401, reception exclusive use. The time 402 is extracted and registered in the communication inhibition table 205.
- the format of the communication prohibition table 205 is shown in FIG.
- transmitting station ID 303 is recorded in transmission source ID 801, and time obtained by adding the transmission start time to the time when receiving the RTS frame is recorded in use start time 803, and used for transmission occupancy time 804.
- the time when the transmission occupancy time 308 is added to the start time 803 is recorded.
- the time when the CTS frame is received is recorded, and the time when the reception occupancy time is added to the use start time 803 is recorded as the transmission occupancy time 804.
- the frame ID 805 the frame ID 306 is recorded as S, and in the reception channel ID 806, the CH 310 is recorded.
- the communication information analysis unit 204 sets a communication enabled flag in the communication reservation time zone registered in the communication reservation table 206.
- the communication reservation table 206 is communication reservation information stored when transmitting to another wireless communication apparatus, and the format of the communication reservation information is shown in FIG.
- the receiving party ID 902 has the MAC address of the other party of communication recorded
- the use start time 903 has the time until the start of the reserved communication recorded
- the transmission occupancy time 904 is the occupancy time of the reserved communications. Is recorded, a frame ID 306 is recorded in the frame ID 905, and a flag indicating the presence or absence of a response is recorded in the response 906.
- the communication response information generation unit 207 receives a notification from the communication information analysis unit 204 that the RTS frame addressed to itself has been received, and generates a CTS frame in response to the RTS frame. At this time, the communication response information generation unit 207 checks whether the registration of the other wireless communication apparatus power including the whole or a part of the communication reserved time zone is in the communication prohibition table 205 or not. is there.
- the function of the communication response information generation unit 207 for generating a CTS frame corresponds to the response information generation unit of the present invention.
- the communication response information generation unit 207 receives the communication reservation request from the communication data generation unit 210 described below, and generates an RTS frame for communication reservation to another wireless communication device. . Also, the communication response information generation unit 207 sets a time until the start of data transmission to the event timer 209.
- the communication data generation unit 210 receives a communication request from the application unit 203, and generates a transmission data frame of the content data and the like passed from the application unit 203 as well. Also, it instructs the communication response information generation unit 207 to reserve a time zone for data transmission.
- communication response information generation section 207 always generates keep-alive frames at a prescribed cycle, and transmits from transmission section 211 to another wireless communication apparatus in the communicable area.
- the transmission station ID also recognizes the wireless communication device in the communicable area.
- the wireless communication devices 101 to 104 notify each other of their own existence. That is, in the case of the positional relationship of the wireless communication devices 101 to 104 in the wireless communication network of FIG. 1, the wireless communication device 101 detects the presence of the wireless communication device 102, and the wireless communication device 102 detects the presence of the wireless communication devices 101, 103, and 104. Detect the presence. Also, the wireless communication device 103 detects the wireless communication devices 102 and 104, and the wireless communication device 104 detects the wireless communication devices 102 and 103.
- FIG. 10 is a flow chart showing an operation of transmitting an RTS frame for communication reservation.
- the communication data generation unit 210 instructs the communication response information generation unit 207 to make a communication reservation.
- the communication response information generation unit 207 refers to the communication prohibition table 205 to obtain a time zone in which the communication is not prohibited. Then, the communication available time zone is registered in the communication reservation table (step S 1002). In the communication prohibition table 205, the prohibition time zone is not recorded in the initial state, but when the wireless communication apparatus receives a communication reservation not addressed to itself, the communication information analysis unit 204 records the communication prohibition time zone.
- the communication response information generation unit 207 transmits the transmission start time and the transmission occupancy time to the RTS frame transmission start time 307 and transmission occupancy time 308, respectively. Set Also, it sets its own MAC address to the transmitting station ID 303 and the MAC address of the destination to the receiving station ID 304, respectively, and generates an RTS frame (step S1003). After that, the communication response information generation unit 207 generates an RTS frame. Are transmitted to the transmission unit 211 and transmitted via the antenna 200 (step S 1004).
- the above is the operation of the data transmission reservation from the wireless communication apparatus.
- the signal received from the antenna 200 is converted into a digital frame by the receiving unit 201 (step S1101).
- the communication data selection unit 202 selects the type of digital frame converted by the reception unit 201 (step S 1102).
- step S 1105 CTS frame processing (step S 1103), RTS frame processing (step S 1104), and other processing (processing in the case of receiving a keepalive frame, data frame, etc.): step S Do 1105).
- FIG. 12 is a flowchart showing CTS frame processing (step S 1103).
- the communication information analysis unit 204 determines whether the MAC address of the transmission station ID of the received CTS frame matches that of its own (step S 1201). If the MAC address is not addressed to itself, the use start time 803 and the transmission occupancy time 804 obtained from the transmission start time 307 and the transmission occupancy time 308 to the communication inhibition table 205 correspond to the transmission station ID303 (sender ID 801). And register (step S 1202).
- a response presence flag is set in the response 906 in the communication reservation table 206 (step S 1203).
- the communication response information generation unit 207 sets the use start time 903 registered in the reception destination ID 902 corresponding to the reception station ID 304 from the communication reservation table 206 to the event timer 2 09 and starts it (see FIG. Step S 1204).
- the event timer 209 notifies the communication data generation unit 210 (step S1205).
- the communication data generation unit 210 receives the content data and the like to be transmitted from the application unit 203, and generates a data frame (step S1206). Thereafter, the communication data generation unit 210 transmits the generated data frame to the transmission unit 211, and is transmitted via the antenna 200 (step S1207).
- RTS frame processing step SI 104 will be described with reference to a flowchart shown in FIG.
- the communication information analysis unit 204 determines whether the MAC address of the transmission station ID 303 of the RTS frame matches that of its own (step S 1301). If the MAC address is not addressed to itself, the transmission start time 307, the transmission occupancy time 308, the usage start time 803 and the transmission occupancy time 804 determined to the communication prohibition table 205 are set as the transmission station ID 30 3 (sender ID 801). It matches and registers (step S1302).
- communication 'response information generation section 207 determines that reception is possible without interference from other wireless communication apparatuses, and generates a CTS frame (step S 1304). After that, the communication response information generation unit 207 transmits the generated CTS frame to the transmission unit 211, and the CTS frame is transmitted via the antenna 200 (step S1305).
- step S 1303 when there is an overlapping time zone, a prohibition time zone is calculated by combining the registered communication prohibition time zone with reference to communication prohibition table 205 (step S 1306). .
- the communication response information generation unit 207 sets the calculated communication prohibited time zone as the reception start time 401 and the reception exclusive time 402 of the nCTS frame. Further, the same frame ID as the RTS frame is set in the frame ID 306 (step S1307). If there are a plurality of calculated time zones, their reception start time 401 and reception occupation time 402 are set, and the number of sets is set as the number of entries. Thereafter, the communication response information generation unit 207 transmits the generated nCTS frame to the transmission unit 211, and is transmitted via the antenna 200 (step S1308).
- the other reception processing (step S 1105) is normal reception processing, and data and the like are passed from the communication data selection unit 202 to the application unit 203.
- the wireless communication device 101 is wireless
- the case of transmitting data to the communication apparatus 102 will be described as an example.
- an RTS signal 701 is transmitted from the nondirectional antenna into the area 113. Since the wireless communication device 102 exists in the area 113, it receives the RTS signal 701 from the wireless communication device 103. At this time, the wireless communication apparatus 102 registers it in the communication prohibition table as a communication prohibition time zone. Figure 8 shows the registration data at this time.
- the sender ID 801 uses the MAC address of the transmitting station ID of the received RTS signal 701, and the receiver ID 802 uses the received station ID 304 of the received RTS signal 701.
- the channel number (CH) 310 of the received RTS signal 701 is recorded in each.
- the CTS signal 702 is transmitted from the wireless communication device 104 to the area 114 toward the wireless communication device 103. Because wireless communication device 102 is also located within area 114, it receives CTS signal 702. At this time, the wireless communication apparatus 102 tries to register in the communication prohibition table 205 as a communication prohibited time zone, but when the RTS signal 701 has already been received, the registration is not performed because it has already been registered.
- the wireless communication apparatus 101 transmits an RTS signal 703 to start communication with the wireless communication apparatus 102 in the communicable area 111.
- the wireless communication apparatus 102 when the wireless communication apparatus 102 receives the RTS signal 703 from the wireless communication apparatus 101, the wireless communication apparatus 101 requests a communication addressed to itself from the transmitting station ID 303 of the RTS frame and the receiving station ID 304. Recognize that Also, the wireless communication apparatus 102 detects a data transmission time zone from the transmission start time 307 and the transmission occupancy time 308.
- the wireless communication device 102 refers to the communication prohibition table 205, and a portion where the detected time zone overlaps in the same channel as the communication time zone between the wireless communication device 103 and the wireless communication device 104 recorded earlier.
- wireless communication apparatus 102 To detect that there is When wireless communication apparatus 102 detects that there is an overlapping communication time zone, reception can not be performed in wireless communication apparatus 101 in the designated time zone, and the communication prohibited time zone is determined by nCTS signal 704. Notice. However, through When the channels of the transmission inhibition table 205 are different channels, as usual, the CTS signal is returned in response to the RTS signal.
- wireless communication apparatus 101 receives nCTS signal 704, wireless communication apparatus 101 determines a time zone that matches the transmission conditions in a time zone excluding the communication prohibited time zone notified from wireless communication apparatus 102, A communication reservation is made by designating the time zone obtained for the RTS signal 705 anew.
- the wireless communication device 102 receives the RTS signal 705, it confirms that it does not overlap with the communication prohibited time zone registered in the communication prohibition table 205, and sends the CTS signal 706 to the wireless communication device 101. Send. Also, it is registered in the communication reservation table 206, and the transmission to the self from other wireless communication devices is rejected.
- Fig. 9 shows the registration data at this time.
- the sending station ID 303 of the RTS signal 705 is sent to the sending source ID 901, and the receiving station ID 304 power of the RTS signal 705 is sent to the receiving party ID 902
- the transmission start time 307 is recorded in the transmission occupancy time 904, and the transmission occupancy time 308 of the RTS signal 705 is recorded in the frame ID 905, and "0" is recorded in the frame ID 306 response 906 of the RTS signal 705.
- the wireless communication apparatus 101 when the wireless communication apparatus 101 receives the CTS signal 706 and determines that communication is possible, the wireless communication apparatus 101 sets a transmission start time tl in the event timer 209 and activates it. At this time, the CTS signal 706 is also transmitted to the wireless communication device 103 and the wireless communication device 104 located in the communicable area 112 of the wireless communication device 102. Similarly to the wireless communication device 102, each of the wireless communication device 103 and the wireless communication device 104 records the notified time zone as a communication prohibited time zone.
- data transmission 707 to 708 is performed from the wireless communication apparatus 103 to the wireless communication apparatus 104.
- the wireless communication device 102 receives these data transmissions but ignores them because they are not addressed to themselves.
- the wireless communication apparatus 101 performs data transmission 709 to 710, and the wireless communication apparatus 102 receives them. Also, if there is still data to be transmitted or if it is desired to transmit data to the wireless communication apparatus 102 in synchronization, the wireless communication apparatus 101 transmits the continuation of the data and the next RTS signal by the signal 711. Time t2 to notify.
- the frame used at this time is the same as the RTS frame. It is one.
- the wireless communication apparatus 102 acquires time t2 when the RTS signal 712 is sent, the wireless communication apparatus 102 registers it in the communication reservation table, and rejects transmission to itself from other wireless communication apparatuses.
- wireless communication apparatus 101 transmits RTS signal 712 to wireless communication apparatus 102 at designated time t2, and reserves communication. At this time, a communication start time t3 is newly notified.
- the subsequent operation is the same as the operation after receiving the RTS signal 705.
- the wireless communication apparatus 102 receives the RTS signal 712
- the communication prohibited time zone registered in the communication prohibited table 205 is It confirms that they do not overlap, and transmits a CTS signal 713 to the wireless communication apparatus 101.
- the wireless communication device 101 performs data transmission 714 to 715, and the wireless communication device 102 receives them.
- the wireless communication device of the transmission destination notifies the wireless communication device of the transmission source of the time zone for which communication is prohibited.
- the present invention is not limited to this. It is also possible. As a result, it is possible to notify only the time zone suitable for the wireless communication apparatus on the receiving side, and it is also possible to shorten the CTS frame length as compared to notifying a plurality of communication prohibited time zones.
- nCTS frame 704 prohibits reception and prohibits communication.
- the present invention is not limited to this, and it is also possible to set the Correspondence Bit (CO) 309 of the CTS frame to notify only reception non-permission.
- the wireless communication apparatus of the transmission source receives the notification of non-permission of reception, and if necessary, queries the wireless communication apparatus of the transmission destination about the communication prohibited time zone. Then, in response to this, it is possible that the wireless communication apparatus of the transmission destination notifies the time zone of the communication prohibition. In this way, if there is no need for the wireless communication device of the transmission source, the wireless communication device of the transmission source and the transmission destination does not transmit extra information because it does not need to ask about the time zone of communication prohibition. You can
- the wireless communication device can receive the RTS signal transmitted from the other wireless communication devices within the communicable area, it is possible to perform other wireless communication devices performing communication other than with itself. Can know the time zone used for data transmission. For this reason, Since it is possible for communication to be performed without the time zone in which other wireless communication devices transmit data, the wireless communication device can receive data addressed to itself without interference.
- the wireless communication apparatus can always transmit, receive, and receive the RTS signal at this time, there is a low possibility that the RTS signal can not be received due to a collision. Therefore, it is easy to realize the above operation.
- the radio communication apparatus since the radio communication apparatus according to the present invention notifies the communication time of the RTS signal to be transmitted next at the end of data transmission, the RTS signal can be received more accurately. By making the transmission start time of the RTS signal power constant, it is also possible to synchronously transmit data to the transmission destination.
- the wireless communication apparatus since the wireless communication apparatus according to the present invention can always receive the RTS signal, the wireless communication apparatus in the communicable area may receive a broadcast that is transmitted from another wireless communication apparatus. It is possible.
- the wireless communication apparatus can perform communication using a plurality of channels simultaneously, so that communication with a larger capacity can be performed.
- FIG. 14 is a block diagram showing the configuration of a wireless communication apparatus according to this embodiment.
- the narrowband receiving unit 1402 and the narrowband transmitting unit 1401 can be used for transmission and reception only in narrowband channels. It is different from
- RTSZCT S is used for broadcast transmission to the power save node.
- the narrowband transmission section 1401 transmits an RTS signal or a multicast signal in a narrowband channel whose transmission channel is limited to a predetermined value or less.
- the transmission unit 211 is used for data transmission and the like, and the communication response information generation unit 207 transmits an RTS signal or a multicast signal to the narrowband transmission unit 1401.
- narrow band reception section 1402 is a reception channel limited to a predetermined band or less, and receives an RTS signal and a multicast signal. Therefore, narrow band reception The unit 1402 may have a circuit configuration that operates at a lower speed than the receiving unit 201, and power consumption is lower than that of the receiving unit 201.
- the communication data sorting unit 202 sorts out the frames of the receiving unit 201 and the narrow band receiving unit 1402 and at the same time the data reception is completed and shifts to the reception mode of the RTS signal, the power saving instruction to the receiving unit 201 is given. Do. Further, when receiving the RTS signal from the narrow band reception unit 1402, the communication data selection unit 202 instructs the reception unit 201 to recover from the power save.
- the communication information analysis unit 204 When the communication information analysis unit 204 receives a notification of power saving from the communication data selection unit 202, the communication information analysis unit 204 notifies the communication response information generation unit 207.
- the communication response information generation unit 207 sets information indicating the power save state in the PS flag 504 of the keepalive frame, and transmits the keepalive frame from the narrowband transmission unit 1401. By this, the wireless communication apparatus notifies the surrounding wireless communication apparatuses that it is in the power save mode.
- the receiving unit 201 stops the receiving function, and the receiving unit 201 is in the power saving state until receiving a recovery instruction from the communication data selection unit 202.
- the communication operation is also the same as that of the first embodiment except that the RTS signal is transmitted from narrowband transmitter 1401 and the RTS signal is received by narrowband receiver 1402.
- the UWB wireless communication apparatus may put the receiving unit 201 into the power saving state until the RTS signal is received when data transmission / reception is completed. it can. As a result, even when the UWB wireless communication apparatus, which requires a large amount of power for carrier sensing of the UWB, can always receive the RTS signal, power consumption can be reduced.
- the present invention when communication data selection unit 202 receives the RTS signal from narrowband reception unit 1402, the present invention is not limited to the force that instructs reception unit 201 to return from power saving.
- the communication data sorting unit 202 is notified of the time zone for which transmission of data addressed to itself is reserved from the communication information analysis unit 204, only the time zone for which transmission is scheduled is restored to the power saving capability of the receiving unit 201. Can also be instructed. This will help to further reduce power consumption.
- the wireless communication device It is also possible to voluntarily shift the reception unit 201 to the power save state by an instruction, or to allow the user to intentionally put the reception unit 201 in the power save state.
- the wireless communication apparatus can request in advance that another wireless communication apparatus located in the surrounding communicable area transmit an RTS signal or a multicast signal in a narrow band channel. .
- This transmission request uses the keep alive frame shown in FIG.
- FIG. 19 differs from the configuration of the keep alive frame shown in FIG. 5 in that it has channel specification field 1901.
- a channel specification field 1901 requests a channel to be used for transmitting an RTS signal or a multicast signal.
- the other wireless communication apparatus can transmit the RTS signal or the multicast signal on the narrowband channel according to the request.
- the present embodiment has been described using a carrier signal, the present invention is not limited to this, and it is also possible to use a signal for notifying a carrier as a preamble of a frame.
- the wireless communication method of the present invention can be applied to any protocol regardless of the communication system.
- FIGS. 20A and 20B show a transmitter and a receiver according to Embodiment 3 of the present invention.
- communication data generation unit 1520 receives communication from application unit 203 and generates communication data such as content.
- the CS signal generation unit 1502 generates a carrier sense signal (CS signal) including a procedure for transmitting data and control information for controlling communication channel switching, and the data generation unit 1503 generates data. It generates a frame.
- CS signal carrier sense signal
- the first impulse waveform generation unit 1604 supplies an impulse waveform modulated by the CS signal of impulse width ⁇ 1 to the oscillation unit 1607.
- the CS signal generator 1502 and the first impulse waveform generator 1604 correspond to a control information pulse generator.
- the second impulse waveform generation unit 1605 supplies the impulse waveform modulated by the data signal of the impulse width ⁇ 2 to the oscillation unit 1607.
- the data generator 150 3 and the second impulse waveform generator 1605 correspond to a data pulse generator according to the present invention.
- ⁇ 1 sets the pulse width wider than ⁇ 2.
- the oscillating unit 1607 outputs an oscillating signal according to the input impulse waveform.
- the oscillation signal is a U WB signal which is defined by the impulse width of the input in-noise signal.
- the amplification unit 1506 supplies the radio signal amplified to the amplitude necessary for transmission to the antenna 221 and radiates it to space.
- the amplification unit 1506 and the antenna 221 correspond to a transmission unit according to the present invention.
- the amplification unit 1516 amplifies the signal supplied from the antenna 222 to an amplitude necessary for reception processing.
- the narrowband demodulation unit 1515 demodulates the received signal when the received signal is a narrowband modulation signal. At this time, by setting the modulation rate to a predetermined value or less, the demodulation rate of the narrowband demodulation unit 1515 that demodulates the modulated signal can also be set to a predetermined value or less. That is, the operation speed of the elements constituting the narrow band demodulation unit 1515 can be set low. As a result, the power consumption of the narrowband demodulation unit 1515 can be made equal to or less than a predetermined value.
- the narrow band demodulation unit 1515 and the carrier detection unit 1513 correspond to the ith receiving unit of the present invention.
- Wideband demodulation section 1514 demodulates the received signal when the received signal is a signal of wide band modulation.
- the wideband demodulation unit 1514 and the data decoding unit 1512 correspond to the second receiving unit of the present invention.
- Feeding switch 1517 is a switch for controlling power supply to data decoding unit 1512 and wideband demodulation unit 1514, and by stopping feeding, data decoding unit 1512 and wideband demodulation unit 1514 are in a power saving state. become. In the initial state, it is in the power save state.
- the communication data generation unit 1520 of the transmission apparatus generates communication data according to an instruction from the application unit, and instructs the CS signal generation unit 1502 to transmit a CS signal.
- CS signal generation unit 1502 generates a CS signal including an ID for specifying a transmission destination reception apparatus, and outputs the CS signal to first impulse waveform generation unit 1604.
- the first impulse waveform generation unit 1604 cuts the pulse width of the oscillation unit 1607 with the impulse width ⁇ 1 of the CS signal. This produces a narrow band signal.
- the narrowband signal is amplified by the amplification unit 1506 and then emitted from the antenna 221.
- the signal received from the antenna 222 of the receiving apparatus is amplified by the amplification unit 1516, and then the narrow band demodulation unit 1515 performs demodulation processing. Then, the carrier detection unit 1513 determines whether or not it is a CS signal, and if it is a CS signal, the communication data selection unit 202 is notified.
- the communication data selection unit 202 determines that the control information is addressed to itself, the communication data selection unit 202 controls the power supply switch 1517 to supply power to the wide band demodulation unit 1514 and the data decoding unit 1512 to bring them into operation.
- the communication data generation unit 1520 of the transmission apparatus instructs the data generation unit 1503 to transmit data.
- Data generation unit 1503 generates a data frame, and outputs the data frame to second impulse waveform generation unit 1605.
- the second impulse waveform generator 1605 cuts out the pulse width of the oscillator 1607 with an impulse width ⁇ 2 . This generates a UWB signal.
- the UWB signal is amplified by the amplification unit 1506 and then emitted from the antenna 221.
- the signal received from the antenna 222 of the receiving apparatus is amplified by the amplification unit 1516, and then transmitted to the wide band demodulation unit 1514 to perform demodulation processing.
- the decoded signal is decoded by the data decoding unit 1512 and then sent to the communication data selection unit 202.
- the communication data selection unit 202 recognizes the received data as content, it is sent to the application unit 203, and the reception process is completed.
- the transmitting apparatus applies control information and data It can be easily modulated to a UWB signal having a bandwidth corresponding to the bandwidths ⁇ 1 and ⁇ 2. That is, the radio communication apparatus in which the modulation method is UWB according to impulse radio in the present embodiment controls the oscillator as the impulse signal with a narrow band modulation signal power S pulse width, and the narrow band modulation signal is a pulse. By controlling as a wide impulse signal, it is possible to generate a UWB signal having wide bandwidth and narrow bandwidth.
- the narrow band demodulation unit consumes less power than the wide band demodulation unit by setting the wide band demodulation unit to be inactive when waiting for the CS signal which occupies most of the communication time.
- the present invention is not limited to this, and a carrier sense signal not including control information is also possible.
- the wideband demodulation unit and the data decoding unit are released from the power saving state as long as the carrier sense signal is received by the narrow band channel regardless of whether or not it is a carrier sense signal addressed to itself. It enables reception on a wideband channel.
- FIG. 15 shows a transmission function unit including the transmission unit 211 and the narrow band transmission unit 1401 of the wireless communication apparatus shown in FIG. 14 of the second embodiment of the present invention, the reception unit 201 and the narrow band reception unit 1402
- FIG. 8 is a block diagram illustrating in detail a reception function unit including
- transmission function unit 1500 is connected to antenna 1507 for transmitting a radio signal, and transmission signal generation unit 1501 including CS signal generation unit 1502 and data generation unit 1503 and narrow band modulation.
- transmission signal generation unit 1501 including CS signal generation unit 1502 and data generation unit 1503 and narrow band modulation.
- a section 1504, a wide band modulation section 1505, and an amplification section 1506 are included.
- CS signal generator 1502 of transmission signal generator 1501 generates a carrier sense signal (CS signal), and data generator 1503 generates a data signal as appropriate.
- Wideband modulation section 1505 modulates the input signal as a wideband signal such as UWB.
- the wideband modulation unit 1505 corresponds to the second transmission unit of the present invention.
- the narrow band modulation unit 1504 modulates the input signal as a signal having a narrower band than the wide band signal. At this time, by setting the modulation speed to a predetermined value or less, the operation speed of the elements constituting the narrow band modulation unit 1504 can be set low. As a result, the power consumption of the narrowband modulation unit 1504 can be made equal to or less than a predetermined value.
- the narrow band modulation unit 1504 corresponds to the first transmission unit of the present invention.
- the amplification unit 1506 supplies the radio signal 1009 amplified to an amplitude necessary for transmission to the antenna 1507 and radiates it to space.
- the CS signal generation unit 1502 and the narrow band modulation unit 1504 correspond to the narrow band transmission unit 1401 in FIG. 14 of the second embodiment, and the data generation unit 1503 and the wide band modulation unit 1505 are transmitted. It corresponds to Part 211.
- the reception function unit 1510 is connected to an antenna 1507 for receiving the radio signal 1009, and an amplification unit 1516, a narrow band demodulation unit 1515, a wide band demodulation unit 1514, a demodulation unit 1511, and a feed switch. It consists of 1517. Further, the demodulation unit 1511 is further configured by a carrier detection unit 1513 and a data decoding unit 1512.
- the amplification unit 1516 amplifies the signal supplied from the antenna 1507 to an amplitude necessary for reception processing.
- Narrowband demodulation section 1515 demodulates a received signal when the received signal is a narrowband modulation signal. At this time, by setting the modulation rate to a predetermined value or less, the demodulation rate of the narrowband demodulation unit 1515 that demodulates the modulated signal can also be set to a predetermined value or less. That is, the operation speed of the elements constituting the narrow band demodulation unit 1515 can be set low. As a result, the power consumption of the narrowband demodulation unit 1515 can be made equal to or less than a predetermined value.
- the narrow band demodulation unit 1515 and the carrier detection unit 1513 correspond to the ith receiving unit of the present invention.
- Wideband demodulation section 1514 demodulates the received signal when the received signal is a signal of wide band modulation.
- the wideband demodulation unit 1514 and the data decoding unit 1512 correspond to the second receiving unit of the present invention.
- Feeding switch 1517 is a switch for controlling power supply to data decoding unit 1512 and wideband demodulation unit 1514, and by stopping feeding, data decoding unit 1512 and wideband demodulation unit 1514 are in a power saving state. become.
- the data decoding unit 1512, the wideband demodulation unit 1514, and the feeding switch 1517 correspond to the receiving unit 201 in FIG. 14 of the second embodiment, and the carrier detection unit 1513 and the narrow band demodulation unit 1515 are narrow. This corresponds to the band reception unit 1402.
- communication data generation unit 1520 includes communication data generation unit 210, communication response information generation unit 207, communication information analysis unit 204, event timer 209, communication prohibition table 205, and communication reservation table 206 in FIG. It corresponds to
- FIG. 17 is a flowchart showing the transmission process performed by the wireless communication apparatus on the transmitting side
- FIG. 18 is a flowchart showing the reception process performed by the wireless communication apparatus on the receiving side.
- the transmission signal generation unit 1501 of the wireless communication apparatus supplies the narrow band modulation unit 1504 with the CS signal from the CS signal generation unit 1002.
- communication data generation unit 1520 receives a request for transmission of content data from application unit 203 to another wireless communication apparatus, transmission start time and transmission occupancy time for communication reservation are set. And generate a RTS frame, and sends it to the CS signal generator 1502 (step S1701). Then, the CS signal generator 1502 supplies the generated RTS frame to the narrowband modulator 1504 including the generated RTS frame.
- Narrow band modulation section 1504 receives this signal and modulates it into a narrow band signal, and outputs this narrow band modulation signal to amplification section 1506.
- the amplification unit 1506 amplifies this narrow band modulation signal and sends it out as a radio signal 1009 from the antenna 1507 (step S 1702).
- the narrow band demodulation unit 1515 and the carrier detection unit 1513 are always in operation.
- the broadband demodulation unit 1514 and the data decoding unit 1512 are powered off by the power supply switch 1517, and are generally in the sleep state (or power save state) (step S1801).
- the reception function unit 1510 amplifies the signal received by the antenna 1507 by the amplification unit 2002, and then the narrow band demodulation unit 2004 Perform demodulation processing.
- the carrier detection unit 1513 determines whether it is a CS signal (step S 1802).
- the communication data selection unit 202 is notified. Also, even if the carrier contains an RTS frame, it is sent to the communication data selection unit 202, and the RTS frame processing shown in FIG. 13 is performed as in the first embodiment (step S1803).
- communication data selection unit 202 controls feed switch 1517 to obtain a wideband demodulation unit. Power is supplied to the unit 1514 and the data decoding unit 1512 so as to be in operation (step S1805).
- the transmission of the CTS frame or nCTS frame performed in the RTS frame processing is performed in the same manner as the transmission of the RTS frame performed by the transmission function unit 1501. That is, the communication data generation unit 1520 generates a CTS frame or nCTS frame (step S1806), and the carrier from the CS signal generation unit 1502 performs the narrow band signal including the CTS frame or nCT S frame (step S1807) .
- the carrier detection unit 1513 of the reception function unit 1510 receives the carrier including the CTS frame or the nCTS frame (step S1703). Then, the carrier detection unit 1513 sends the CTS frame to the communication data selection unit 202, and the communication data selection unit 202 performs the CTS frame processing shown in FIG. 12 (step S1704).
- step S 1705 when communication data generation unit 1520 is notified by communication data selection unit 202 that reception is possible, data generation unit 1503 receives data according to the communication reservation (step S 1705) as in the first embodiment. Generate a row.
- the wideband modulation unit 1005 modulates this data sequence, and after amplification by the amplification unit 1006, transmits it as a radio signal 1009 from the antenna 1507 (step S1706).
- the reception function unit 1510 amplifies the wideband signal received from the antenna 1507 by the amplification unit 2002, and then the wideband demodulation unit 2005 Performs demodulation processing. Thereafter, the data decoding unit 1512 decodes the wideband demodulation signal and sends it to the communication data selection unit 202 (step S1808).
- the communication data selection unit 202 recognizes the received data as content, it is sent to the application unit 203 and reception processing is completed.
- carrier signal 701 including a force RTS frame which is the same as that in the first embodiment shown in FIG. 703 and 705 and the CTS frame, and! /, Are different from the signals 702, 704, and 706 including the nCTS frame in that they are narrow band signals and the data signals 707 to 712 are wide band signals.
- the wideband modulation section 1505 can perform high-speed communication by adopting a wideband modulation method such as UWB.
- a wideband modulation method such as UWB.
- the narrow band modulation unit 1504 adopts the narrow band modulation method, communication at low speed but with low power consumption becomes possible.
- the wideband demodulation unit when the carrier signal occupying most of the communication time is awaited, the wideband demodulation unit is put into the inactive state, and the narrow band consumes less power than the wideband demodulation unit.
- the demodulation unit By operating the demodulation unit, it is possible to realize a wireless communication device with low total power consumption.
- the communication data selection unit 202 controls the feeding switch 1517 to supply power to the broadband demodulation unit 1514 and the data decoding unit 1512. Control the feed switch 1517 so that the broadband demodulation unit 1514 and the data decoding unit 1512 are energized only during the communication reservation time zone recorded in the communication reservation table 206. Is also possible. In this case, the conduction time to the wideband demodulation unit 1514 and the data decoding unit 1512 can be minimized, and the power consumption of the wireless communication apparatus can be further reduced.
- FIG. 16 is a block diagram showing another configuration corresponding to narrow band modulation section 1 504 and wide band modulation section 1505 of the wireless communication apparatus shown in FIG. 15 of Embodiment 5 of the present invention.
- a first impulse waveform generation section 1604 and a second impulse waveform generation section 1605 are provided. It differs from the wireless communication apparatus in the fourth embodiment in that it has an oscillating portion 1607.
- the first impulse waveform generation unit 1604 supplies the impulse waveform modulated by the CS signal of the impulse width ⁇ 1 to the oscillation unit 1607.
- the second impulse waveform generation unit 1605 supplies the impulse waveform modulated by the data signal of the impulse width ⁇ 2 to the oscillation unit 1607.
- ⁇ 1 sets the pulse width wider than ⁇ 2.
- the oscillating unit 1607 outputs an oscillating signal according to the input impulse waveform.
- the oscillation signal is a U WB signal which is defined by the impulse width of the input in-noise signal.
- the signals from CS signal generation unit 1502 and data generation unit 1503 are compared with the impulse widths ⁇ 1 and ⁇ 2 of first impulse waveform generation unit 1604 and second impulse waveform generation unit 1605.
- the pulse width of the oscillation unit 1607 it can be easily modulated to a UWB signal having a bandwidth corresponding to the impulse widths ⁇ 1 and ⁇ 2 respectively. That is, in the radio communication apparatus in which the modulation method is UWB using impulse radio in this embodiment, the wide band modulation signal power S pulse width is narrow, the oscillation unit is controlled as an impulse signal, and the narrow band modulation signal has a wide pulse width.
- the narrow band modulation signal has a wide pulse width.
- the radio communication apparatus in which the modulation method is UWB based on impulse radio switches the bandwidth with a simple configuration, thereby communicating with a narrow band signal when waiting for a carrier signal. Communication can be performed using broadband signals during data communication. As a result, the wireless communication apparatus in the present embodiment can configure the wireless communication apparatus with low total power consumption.
- the present invention is useful for a wireless communication method and a wireless communication device when performing ad hoc communication and the like, and causes a collision in communication with another wireless communication device while further reducing the power consumption in the reception waiting state. It is suitable to avoid
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US10/573,506 US7787493B2 (en) | 2004-05-31 | 2005-05-30 | Radio communication method and radio communication device |
EP05743833.5A EP1753172B1 (en) | 2004-05-31 | 2005-05-30 | Radio communication method and radio communication device |
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JP2005147886A JP4779437B2 (ja) | 2004-05-31 | 2005-05-20 | 無線通信方法および無線通信装置 |
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JP3485860B2 (ja) | 2000-03-27 | 2004-01-13 | 松下電器産業株式会社 | 基地局装置及び無線通信方法 |
GB0103274D0 (en) * | 2001-02-09 | 2001-03-28 | Nokia Networks Oy | A data communication system |
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US20040110508A1 (en) * | 2002-09-20 | 2004-06-10 | Jacobus Haartsen | Methods and electronic devices for wireless ad-hoc network communications using receiver determined channels and transmitted reference signals |
JP3629259B2 (ja) | 2002-09-30 | 2005-03-16 | 株式会社東芝 | 無線通信端末とその制御ユニット及び通信制御プログラム |
US20040109497A1 (en) * | 2002-11-14 | 2004-06-10 | Unb Technologies, Inc. | Communications system including a narrow band demodulator |
US7103371B1 (en) * | 2003-10-22 | 2006-09-05 | Itt Manufacturing Enterprises, Inc. | Method and apparatus for dynamic voice reservation within wireless networks |
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- 2005-05-20 JP JP2005147886A patent/JP4779437B2/ja not_active Expired - Fee Related
- 2005-05-30 US US10/573,506 patent/US7787493B2/en not_active Expired - Fee Related
- 2005-05-30 WO PCT/JP2005/009849 patent/WO2005117354A1/ja not_active Application Discontinuation
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JP2002223479A (ja) * | 2001-01-29 | 2002-08-09 | Mitsubishi Materials Corp | 無線データ通信システム、基地局、移動局およびプログラム |
JP2004040373A (ja) * | 2002-07-02 | 2004-02-05 | Canon Inc | 無線端末装置およびその制御方法 |
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WO2007085197A1 (fr) * | 2006-01-26 | 2007-08-02 | Lenovo (Beijing) Limited | Système à bande ultralarge (uwb) et procédé de commande d'une unité uwb |
JP2010114804A (ja) * | 2008-11-10 | 2010-05-20 | Sony Corp | 無線通信装置、無線通信システム、および無線通信方法 |
JP4737275B2 (ja) * | 2008-11-10 | 2011-07-27 | ソニー株式会社 | 無線通信装置、無線通信システム、および無線通信方法 |
US8385265B2 (en) | 2008-11-10 | 2013-02-26 | Sony Corporation | Wireless communication device, wireless communication system and wireless communication method |
Also Published As
Publication number | Publication date |
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US7787493B2 (en) | 2010-08-31 |
EP1753172B1 (en) | 2015-08-05 |
JP2006020289A (ja) | 2006-01-19 |
JP4779437B2 (ja) | 2011-09-28 |
US20080248768A1 (en) | 2008-10-09 |
EP1753172A4 (en) | 2012-02-01 |
EP1753172A1 (en) | 2007-02-14 |
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