JP2005333169A - Wireless communication system and wireless communication device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve equipment control, transmission of large-capacity data, and intercommunication by communication operation with low power consumption between equipment in a relatively short range. <P>SOLUTION: A remote control function 205 on the remote control 203 side is provided with a reflected wave function control unit 215, which transmits start-up and stop information of a reflected wave reading module 202 in addition to a remote control information function to electric appliances. An infrared reception module 213 on the electric appliance 201 side receives the start-up and stop information of the reflected wave reading module 202 as an infrared command, and is provided with a reflected wave reading module control unit 216 for controlling the operation of the reflected wave reading module 202 in response to the received command. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a radio communication system and a radio communication apparatus using a radio wave communication method using microwaves of a specific frequency band, and more particularly to a radio communication system and a radio communication system for realizing a communication operation with low power consumption between devices at relatively short distances. The present invention relates to a wireless communication apparatus.

  More specifically, the present invention relates to wireless communication in which data communication is performed by a back scatter method using transmission of an unmodulated carrier wave from the reader side and absorption and reflection of received radio waves based on an antenna termination operation on the transmitter side. More particularly, the present invention relates to a wireless communication system and a wireless communication apparatus that perform control of electrical appliances and large-capacity data transmission such as images using back-scatter communication technology.

  By connecting a plurality of devices to the network, it is possible to achieve efficient command and data transmission, sharing information resources, and sharing hardware resources. More recently, wireless networks have attracted attention as systems that release users from wired wiring.

  One standard for wireless networks is IEEE (The Institute of Electrical and Electronics Engineers) 802.11 (for example, see Non-Patent Document 1), HiperLAN / 2 (for example, Non-Patent Document 2 or Non-Patent Document 2 or Non-Patent Document 2). (See Patent Document 3), IEEE 302.15.3, Bluetooth communication, and the like.

  In recent years, wireless LAN (Local Area Network) systems have become cheaper, and wireless LANs have become widespread due to the fact that they have been built into PCs (Personal Computers) as a standard. In addition to information devices such as PCs and PDAs (Personal Digital Assistance), portable LAN devices such as mobile phones and video cameras are equipped with wireless LAN functions as built-in or external connection adapters. Examples of the application include uploading image data taken with a camera-equipped mobile phone or a digital camera to a PC via a wireless LAN.

  However, the wireless LAN is originally designed and developed on the premise that it is used in a computer, and its power consumption becomes a problem when mounted on a portable device. Many of the IEEE802.11b wireless LAN cards currently on the market have a power consumption of 800 mW or more when transmitting and 600 mW or more when receiving. This power consumption is a heavy burden for battery-powered portable devices.

  As for Bluetooth communication, the maximum transmission speed is as low as 720 kbps, and it is time-consuming and inconvenient for the recent high-quality image transmission.

  In addition, wireless communication technology is applied for remote control of home appliances such as television and video, but in most cases, it is a remote control using infrared rays. This type of infrared remote control is intended for remote control of the operation of appliances and other equipment, so the transmission speed is slow, and it is not practical to transmit large amounts of video data. It does not have.

  In addition, the IrDA high-speed data transmission standard using infrared rays has a transmission distance of at most about 1 meter. For example, it can be used for applications that perform data transmission from a location several meters away in one room. Can not.

International Standard ISO / IEC 8802-11: 1999 (E) ANSI / IEEE Std 802.11, 1999 Edition, Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layers (PH) ETSI Standard ETSI TS 101 761-1 51.3.1 Broadband Radio Access Networks (BRAN); HIPERLAN Type 2; Data Link Control (DLC) Layer; Part1: Basic Control ETSI TS 101 761-2 V1.3.1 Broadband Radio Access Networks (BRAN); HIPERLAN Type 2; Data Link Control (DLC) Layer; Part2: Radio Link Control (LC)

  An object of the present invention is to provide an excellent wireless communication system and wireless communication apparatus capable of realizing device control, large-capacity data transmission, and mutual communication by communication operation with low power consumption between devices in a relatively short distance. It is to provide.

The present invention has been made in consideration of the above problems, and is a wireless communication system that performs data communication by a back scatter method using absorption and reflection of received radio waves,
A device control function unit for processing a control command for remotely operating the device, a data communication function unit for processing transmission data, a control command received by the device control function unit upon receiving an unmodulated carrier, and the data A wireless transmission device including a reflected wave transmission unit that transmits transmission data processed by the communication function unit as a reflected wave signal obtained by back scatter modulation;
A radio transmission / reception apparatus including a reflected wave reading unit that transmits a non-modulated carrier and receives and demodulates a back scatter modulated reflected wave signal; and a device main unit that performs a predetermined device operation;
A wireless communication system.

  However, “system” here refers to a logical collection of a plurality of devices (or functional modules that realize specific functions), and each device or functional module is in a single housing. It does not matter whether or not.

  The wireless transmission system according to the present invention is intended to realize low power consumption in a communication mode in which a transmission ratio occupies most of communication between devices at relatively short distances. Wireless transmission is performed using a reflected wave based on the back scatter method used. The RFID system itself is widely known in the art as an example of a wireless communication means applicable at a short distance.

  When considering remote control of electrical appliances, there is a problem that power consumption is high in a wireless LAN. In addition, the infrared remote controller has a low transmission speed and is not suitable for transmission of large-capacity data and does not have a function of performing mutual communication. In addition, IrDA infrared data communication has a problem that the transmission distance is extremely short in addition to the problem of directivity of infrared rays as a medium.

  On the other hand, according to the wireless communication system according to the present invention, device control and large-capacity data transmission are realized by communication operation with low power consumption by performing wireless transmission using reflected waves based on the back scatter method. can do.

  The wireless communication system according to the present invention includes a wireless transmission device having a function corresponding to an RFID tag and a wireless transmission / reception device having a function corresponding to a tag reader.

  The wireless transmission device is issued by the device control function unit that receives a device control function unit that processes a control command for remotely operating a device, a data communication function unit that processes transmission data, and an unmodulated carrier. The control command and the reflected wave transmission part which transmits the transmission data processed by the said data communication function part as a reflected wave signal which carried out the back scatter modulation are provided, for example, it is comprised as a remote control which controls an electrical appliance remotely.

  Further, the wireless transmission / reception apparatus includes a reflected wave reading unit that transmits an unmodulated carrier, receives a reflected wave signal that has been back-scatter modulated, and performs a demodulation process, and a device main body unit that performs a predetermined device operation. For example, it is configured as an electrical appliance that is remotely operated using a remote controller.

  A wireless transmission device as a remote controller transmits an operation command for an electric appliance or a large amount of data such as an image as a reflected wave signal obtained by back scatter modulation. On the other hand, on the wireless transmission / reception device side as an electrical appliance, the device main body performs device operation according to a control command received by the device control function unit as a reflected wave signal. Further, the wireless transmission / reception apparatus may perform reproduction output of transmission data received as a reflected wave signal.

  Moreover, on the wireless transmission device side as a remote controller, the data communication function unit may include a storage medium for storing transmission data. In such a case, the reflected wave transmission unit may transmit the data read from the storage medium as a reflected wave signal obtained by back scatter modulation. The data communication function unit may include a storage medium interface that removably receives an external storage medium that stores transmission data.

  Here, the wireless communication system according to the present invention employs a back scatter method in which data is transmitted on a reflected wave with respect to a received radio wave. Therefore, if a non-modulated carrier is not transmitted from the reflected wave reading module side, There is a problem that the wave module cannot transmit data.

  Therefore, as a means for solving this problem, the reflection module may be provided with a means for transmitting data indicating the start of transmission.

  For example, the wireless transmission device includes a transmission start / stop information transmission unit that transmits information on the start and stop of transmission by the reflected wave transmission unit, and the wireless transmission / reception device includes a transmission start / stop information transmission unit. A transmission start / stop information receiving unit for receiving the information is provided. Such a transmission start / stop information transmission / reception unit can use an inexpensive communication medium such as an infrared remote controller.

  The reflected wave reading unit starts transmission of an unmodulated carrier in response to reception of transmission start information, and stops transmission of an unmodulated carrier in response to reception of transmission stop information.

  Regular transmission of unmodulated carriers can be a waste of power and can be a disturbing wave to other wireless communication systems. On the other hand, by controlling the start and stop of transmission of the non-modulated carrier in accordance with an instruction from the wireless transmission device side, that is, the user, it is possible to solve the problem of power waste and interference wave.

  According to the present invention, there is provided an excellent wireless communication system and wireless communication apparatus capable of realizing device control, large-capacity data transmission, and mutual communication by communication operation with low power consumption between devices in a relatively short distance. Can be provided.

  Further, according to the present invention, by using a back scatter type communication technique using transmission and transmission of an unmodulated carrier wave from the reader side and absorption and reflection of received radio waves based on an antenna termination operation on the transmitter side, It is possible to provide an excellent wireless communication system and wireless communication device that can realize device control of electrical appliances, large-capacity data transmission such as images, and mutual communication.

  Other objects, features, and advantages of the present invention will become apparent from more detailed descriptions based on embodiments of the present invention described later and the accompanying drawings.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  The present invention is a communication mode in which the transmission ratio occupies most of the communication between devices that are relatively limited to a short distance. The purpose is to realize transmission and mutual communication, and wireless transmission is performed using a reflected wave based on the back scatter method used in RFID.

  RFID is a system that consists of a tag and a reader. The RFID tag, which is a system that reads information stored in the tag in a contactless manner, corresponds to transmission information in response to reception of radio waves of a specific frequency. Therefore, it is possible to specify what the frequency is based on the oscillation frequency of the RFID tag on the reading device side. Examples of the communication method between the tag and the reader / writer include an electromagnetic coupling method, an electromagnetic induction method, and a radio wave communication method. The present invention relates to a radio wave communication system using a microwave such as a 2.4 GHz band.

RFID tag receives the radio wave f _o unmodulated transmitted from the tag reader is rectified, is converted to a DC power source, it is possible to use the DC power supply operating power. On the tag side, the termination of the antenna is performed according to the bit image of the transmission data, and the data is expressed using absorption and reflection of the received radio wave. That is, when the data is 1, the antenna is terminated with the antenna impedance, and the radio wave from the tag reader is absorbed. If the data is 0, the radio wave from the tag reader is reflected by opening the end of the antenna. From the tag, a signal having the same frequency as the transmission signal from the tag reader is returned by reflection of the received radio wave. A communication method that expresses data by a reflection or absorption pattern of an incoming radio wave is called a “back scatter method”. In this way, the tag can send internal information to the reader side with no power supply.

  FIG. 6 shows an example of the configuration of an RFID system that performs back-scatter data transmission. Reference number 1 corresponds to the tag side of the RFID, and includes a tag chip 2 and an antenna 3. As the antenna 3, a half-wave dipole antenna or the like is used. The tag chip 2 includes a modulation unit 10, a rectification / demodulation unit 12, and a memory unit 13.

The radio wave f _o transmitted from the tag reader 21 is received by the antenna 3 and input to the rectifying / demodulating unit 10. Here, the received radio wave f _o is rectified, and at the same time is converted into a DC power source, the demodulation function by the DC power supply starts operating, that to the tag 1 is read signal is recognized. The power generated by receiving the radio wave f _o is also supplied to the memory unit 13 and the modulation unit 10.

  The memory unit 13 reads ID information stored therein in advance and sends it to the modulation unit 10 as transmission data. The modulation unit 10 includes a diode switch 11 and repeats the on / off operation of the diode switch 11 according to the bit image of the transmission data. That is, if the data is 1, the switch is turned on and the antenna is terminated with antenna impedance (eg, 50 ohms). At this time, radio waves from the tag reader 21 are absorbed. When the data is 0, the switch is turned off, the diode switch 11 is opened, and at the same time, the end of the antenna is opened. At this time, the radio wave from the tag reader 21 is reflected and returns to the transmission source. Data can be expressed by a reflection or absorption pattern of an incoming radio wave, that is, a back scatter. In this way, the tag 1 can send internal information to the reader side with no power supply.

  One tag reader 21 includes a host device 6 such as a portable information terminal, a tag reader module 4, and an antenna 5 connected to the tag reader module 4.

The host device 6 notifies the communication control unit 19 of the tag 1 read instruction via the host interface unit 20. Upon receiving the tag read command from the host interface unit 20, the communication control unit 19 performs a predetermined editing process on the transmission data, and further performs filtering, and then sends it to the ASK modulation unit 17 as a baseband signal. send. ASK modulating unit 17, ASK with frequency f _o of the frequency synthesizer 16: performing (Amplitude Shift Keying amplitude shift keying) modulation.

  The frequency setting of the frequency synthesizer 16 is performed by the communication control unit 20. In general, the transmission frequency to the tag is used by hopping in order to reduce the standing wave of the signal from the RF tag and multipath. This hopping instruction is also given by the communication control unit 20. The transmission signal subjected to ASK modulation is radiated from the antenna 5 toward the tag 1 via the circulator 14.

  A signal having the same frequency as the transmission signal from the tag reader 21 is returned from the tag 1 by reflection by the back scatter method (described above). This signal is received by the antenna 5 of the tag reader 21 and input to the mixer 15. Since the same local frequency fo as the transmission is input to the mixer 15, a signal modulated on the tag 1 side appears at the output of the mixer 15. The demodulator 18 demodulates 1/0 data from this signal and sends it to the communication controller 19. The communication control unit 19 decodes the data, takes out the data stored in the memory 13 in the tag 1, and transfers it from the host interface unit 20 to the host device 6.

  The tag reader 21 can read information in the tag 1 by the mechanism as described above. In general, the tag reader can also be used as a tag writer, and can write specified data on the host device 6 side into the memory 13 in the tag 1.

  In the RFID system, the antenna switch is generally composed of a gallium arsenide IC, and its power consumption is several tens of μW or less. Therefore, according to the communication method described above, wireless image transmission with ultra-low consumption can be realized. That is, the average power when performing data transmission is 10 mW or less in the case of the delivery confirmation method, and data transmission is possible at several tens of μW in the one-way transmission. This is an overwhelming performance difference compared to the average power consumption of a general wireless LAN.

  FIG. 1 schematically shows a configuration of a wireless communication system according to an embodiment of the present invention. The illustrated wireless communication system includes an electrical appliance 201 such as a television and a video, and a remote controller 203 that performs remote control on the electrical appliance 201 and transmits data.

  The remote control 203 side includes a reflected wave module 204 that controls reflection of radio waves in accordance with data transmitted to the electrical appliance 201, a remote control function unit 205 that controls electrical appliances, and a data communication function unit for transmitting large-capacity data. 206.

  The reflected wave module 204 corresponds to a tag in the RFID system, and when receiving a non-modulated carrier from the tag reader side, the remote control function unit 205 uses a back scatter method to express data by a radio wave reflection or absorption pattern. The remote control command is transmitted or the transmission data is transmitted by the data communication function unit 206.

  The remote control function unit 205 issues an operation command according to a command system for remote control of the electrical appliance 201 according to a user operation on the remote controller 203. Since the command system for remote control is not directly related to the gist of the present invention, the description is omitted here.

  For example, the data communication function unit 206 reflects a large amount of data such as image data stored in a recording medium (not shown) built in the remote controller 203, and the electric appliance 201 reflects the reflected wave toward the reading module 202. 208 is transmitted.

  The electrical appliance 201 is a reflected wave reading module 202 that performs back-scatter data communication between an electrical appliance main body such as a television or a video that is to be remotely controlled by the remote controller 203 and the reflected wave module 204 on the remote controller 203 side. It has.

  The reflected wave reading module 202 corresponds to a tag reader in the RFID system, sends out unmodulated carrier, and demodulates the reflected wave signal back-scatter modulated by the reflected wave module 204 to extract transmission data.

  When the transmission data extracted by the reflected wave reading module 202 is a remote control command for the electrical appliance 201, the command system such as TV / video device on / off, volume and display control, channel selection and playback operation, etc. Perform remote control of the equipment.

  Further, when the transmission data extracted by the reflected wave reading module 202 is a large amount of data sent from the data communication function unit 206 such as an image or sound, for example, the main body of the electrical appliance 201 such as a monitor / display or a speaker is used. Data is reproduced and output using the output unit. For example, by sending this image information to a television or the like and displaying it on the television, it becomes possible to realize an application such as displaying a large amount of image data in the remote control on the television.

  FIG. 2 shows a modification of the wireless communication system shown in FIG. In the illustrated example, the data communication function unit 206 on the remote control 203 side includes a storage medium interface 210, and is configured to removably receive a cartridge-type or portable external storage medium 211.

  In this case, for example, an external recording medium such as a memory stick in which image information is recorded, such as a digital camera or a camcorder, is connected to the remote control, and the remote control 203 and the reflected wave reading module 202 are used, for example, for an image on a television or video. It is possible to realize an application that transmits data and displays or records the data on the appliance side.

  As described above, a wireless communication system using RFID has excellent performance from the viewpoint of power consumption. However, since the back scatter method of sending data on the reflected wave with respect to the received radio wave is adopted, the reflected wave module cannot transmit data unless an unmodulated carrier is transmitted from the reflected wave reading module side. There is a problem.

  As a means for solving this problem, the reflection module is equipped with a means for transmitting data indicating the start of transmission.

  FIG. 3 shows another modification of the wireless communication system shown in FIG. In the illustrated system configuration example, the reflected wave module 204 uses infrared remote control communication as data transmission means for indicating transmission start and transmission stop.

  In the remote control function unit 205 on the remote control 203 side, in addition to the remote control information function for the electrical appliance, the function of sending the start and stop information of the reflector reading module 202, that is, the reflected wave function control unit 215 and the activation of the reflected wave reading module 202 And an infrared transmission module 212 for transmitting stop information as an infrared command.

  On the other hand, the infrared receiving module 213 on the electrical appliance 201 side receives start and stop information of the reflected wave reading module 202 as an infrared command, and controls the operation of the reflected wave reading module 202 according to the received command, that is, the reflected wave. A reading module control unit 216 is provided. Alternatively, it is possible to transmit this information to the main body of the electric appliance 201 and control the operation of the reflected wave reader from the electric appliance.

  The reflected wave reading module 202 starts transmission of the non-modulated carrier based on the activation information, and stops transmission of the non-modulated carrier based on the stop information. Regular transmission of unmodulated carriers can be a waste of power and can be a disturbing wave to other wireless communication systems. On the other hand, this type of problem can be solved by controlling the start and stop of transmission of the unmodulated carrier based on the control information from the remote controller 203 side.

  According to such a system configuration, the reflected wave reading module 202 can be controlled by the remote controller at hand.

  The infrared remote controller has problems in terms of transmission speed, directivity, transmission distance, and the like, but it is considered that the infrared remote controller functions sufficiently if it only notifies the start and stop of communication by the back scatter method. Note that a transmission medium other than the infrared remote control communication can be used as a means for transmitting data indicating that the reflected wave module 204 starts transmission and stops transmission.

  FIG. 4 is a flowchart showing an operation procedure for transmitting large-capacity data from the remote control 203 to the electrical appliance 201 in the wireless communication system shown in FIG.

  On the electric appliance side having the tag reader, the reflected wave reading module 202 is activated (step S21), and transmission of an unmodulated carrier is started, and reception operation of a reflected wave signal subjected to back scatter modulation is started ( Step S22).

  On the other hand, on the side of the remote controller 203 provided with a tag, when an instruction for data transmission is given by a user operation (step S11), the reflected wave module 204 waits until the unmodulated carrier is received and ready (step S12).

  When a large-capacity data transmission instruction is given by the user operation (step S13), the transmission data is multiplied by the transmission data by the reflected wave module 204, and back scatter modulation is performed, and data transmission is performed as a reflected wave signal. Perform (step S14).

  On the electrical appliance 201 side, the reflected wave reading module 202 receives and demodulates the reflected wave signal (step S23).

  On the remote controller 203 side, when the transmission of the large volume data is completed, the reflected wave reading module 202 on the electrical appliance 201 side is instructed to stop transmission (step S15), and the large volume data transmission operation itself is terminated (step S16). ).

  Upon receiving an instruction to stop transmission from the remote controller 203, the electrical appliance 201 side stops the transmission of the non-modulated carrier and the reception of the reflected wave signal by the reflected wave reading module 202 in response to this (Step S24). The data transmission operation itself is terminated (step S25).

  In the configuration of the wireless communication system shown in FIG. 1, the reader cannot be controlled from the remote control side when the appliance as a tag reader is not transmitting an unmodulated carrier. Therefore, in the example shown in FIG. 4, the reader side manually activates the reflected wave reading function to send out an unmodulated carrier. Thereafter, when an unmodulated carrier is sent from the reader side, the remote controller side sends data. When the data transmission is completed, the electrical appliance side detects that the operation is stopped manually or by the reflected wave signal from the remote control side, or that the data transmission for the time specified by the timer is not performed (or has been completed). Stop transmission of the modulation carrier.

  FIG. 5 is a flowchart showing an operation procedure for transmitting large-capacity data from the remote control 203 to the electrical appliance 201 in the wireless communication system shown in FIG.

  On the remote controller 203 side provided with a tag, when an instruction for data transmission is made by a user operation (step S31), an infrared command for instructing activation of the reflected wave reading module 202 is transmitted from the infrared transmission module 212 to the electrical appliance 201. (Step S32).

  When receiving the activation information of the reflected wave reading module 202 as an infrared command (step S41), the infrared receiving module 213 on the electrical appliance 201 side activates the reflected wave reading module 202 (step S42) and starts transmitting an unmodulated carrier. At the same time, the receiving operation of the back scatter modulated reflected wave signal is started (step S43).

  On the other hand, the remote control 203 side waits until the reflected wave module 204 receives the non-modulated carrier and is ready (step S33). When a large-capacity data transmission instruction is given by a user operation (step S34), the reflected wave module 204 multiplies the received non-modulated carrier by the transmission data, performs back scatter modulation, and transmits data as a reflected wave signal. This is performed (step S35).

  On the electrical appliance 201 side, the reflected wave reading module 202 receives and demodulates the reflected wave signal (step S44).

  On the remote controller 203 side, when the transmission of the large volume data is completed, an infrared command is transmitted to instruct the reflected wave reading module 202 on the electrical appliance 201 side to stop transmission (step S36), and the large volume data transmission is performed. The operation itself is terminated (step S37).

  On the side of the electrical appliance 201, when an instruction to stop transmission is received by an infrared command from the remote controller 203, the reflected wave reading module 202 stops the transmission of the unmodulated carrier and the reception operation of the reflected wave signal accordingly (step S45). Then, the large-capacity data transmission operation itself ends (step S46).

  In the configuration of the wireless communication system shown in FIG. 3, the reflected wave reading module on the electrical appliance 201 side can be started and stopped using infrared communication. Therefore, first, the reflected wave reading module 202 is activated by an infrared command from the remote controller 203 to start transmission of an unmodulated carrier. When the non-modulated carrier reaches the remote controller 203, data is transmitted from the remote controller 203 side. After that, when the data transmission is completed, it is detected from the remote control 203 side that the operation of the reflector reading module 202 is stopped by infrared communication, reflected wave signal, manual operation, or data transmission for a time specified by a timer, Stop transmission of unmodulated carrier.

  When an image from a digital camera or camcorder is transmitted to a television or video, a remote control is often used for the operation of the television or video. According to the wireless communication system of the present invention, the remote control has an interface of a recording medium of a digital video device and has a function of transmitting the data, so that image data can be transmitted to a television or a video only by operating the remote control. It becomes possible to enjoy.

  In addition, transmission of unmodulated carrier is assumed for back scatter type data transmission, but the remote control should use the infrared remote control function to instruct the appliance side to start the reflector reading module. Thus, it is possible to smoothly start and stop the reflected wave function. In addition, the infrared remote control function that instructs the start and stop of such reflection functions can maintain compatibility with the conventional remote control. An easy-to-use image transmission system can be realized.

  Further, in the wireless communication system according to the present invention, by utilizing the reflected wave transmission function as the data transmission function, high-speed data transmission with low power consumption can be realized, and portable devices (digital cameras and camcorders) The battery will not be consumed. In addition, since the battery of the remote controller can consume much less power than a combination with a wireless LAN or the like, the operation time can be extended.

  A remote controller having a wireless LAN or Bluetooth communication function can take a communication distance of about 50 m to 5 m, but interception of communication by a third party is a problem. On the other hand, in the communication system of the reflected wave signal using the back scatter method according to the present invention, since the communication distance is limited to a few meters that are familiar, it is relatively difficult to intercept communication by a third party. Easy to keep information security easy.

  Also, it often happens that the remote control is missing in daily life. When the remote control system according to the present invention is used, if a remote control search button or the like is attached to the reader side from the reflected wave reading module control unit, for example, the control information is sent from the reader side to the remote controller with one press. Makes it easy to discover by making a sound.

  This is because the present invention uses radio waves rather than infrared rays, so communication is possible in places where radio waves can reach even if they are not visible to each other, and the reader side and the remote control side are one-way communication. This is based on the fact that bidirectional communication is possible.

  The present invention has been described in detail above with reference to specific embodiments. However, it is obvious that those skilled in the art can make modifications and substitutions of the embodiment without departing from the gist of the present invention. That is, the present invention has been disclosed in the form of exemplification, and the contents described in the present specification should not be interpreted in a limited manner. In order to determine the gist of the present invention, the claims section described at the beginning should be considered.

FIG. 1 is a diagram schematically showing a configuration of a wireless communication system according to an embodiment of the present invention. FIG. 2 is a diagram showing a modification of the wireless communication system shown in FIG. FIG. 3 is a diagram showing another modification of the wireless communication system shown in FIG. FIG. 4 is a flowchart showing an operation procedure for transmitting large-capacity data from the remote control 203 to the electrical appliance 201. FIG. 5 is a flowchart showing an operation procedure for transmitting large-capacity data from the remote control 203 to the electrical appliance 201. FIG. 6 is a diagram illustrating a configuration example of an RFID system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 201 ... Electric appliance 202 ... Reflected wave reading module 203 ... Remote control 204 ... Reflected wave module 205 ... Remote control function part 206 ... Data communication function part 210 ... Storage medium interface 211 ... External storage medium 212 ... Infrared transmission module 213 ... Infrared receiving module 215: Reflected wave function controller 216: Reflected wave reading module controller

Claims (19)

A wireless communication system that performs data communication by a back scatter method using absorption and reflection of received radio waves,
A device control function unit for processing a control command for remotely operating the device, a data communication function unit for processing transmission data, a control command received by the device control function unit upon receiving an unmodulated carrier, and the data A wireless transmission device including a reflected wave transmission unit that transmits transmission data processed by the communication function unit as a reflected wave signal obtained by back scatter modulation;
A radio transmission / reception apparatus including a reflected wave reading unit that transmits a non-modulated carrier and receives and demodulates a back scatter modulated reflected wave signal; and a device main unit that performs a predetermined device operation;
A wireless communication system comprising: The device main body performs device operation according to a control command by the device control function unit received as a reflected wave signal.
The wireless communication system according to claim 1. The device body performs reproduction output of transmission data received as a reflected wave signal.
The wireless communication system according to claim 1. The data communication function unit includes a storage medium for storing transmission data,
The reflected wave transmission unit transmits the data read from the storage medium as a reflected wave signal obtained by back scatter modulation,
The wireless communication system according to claim 1. The data communication function unit includes a storage medium interface that removably receives an external storage medium that stores transmission data.
The wireless communication system according to claim 4. The wireless transmission device includes a transmission start / stop information transmission unit that transmits information on the start and stop of transmission by the reflected wave transmission unit,
The wireless transmission / reception apparatus includes a transmission start / stop information receiving unit that receives information from the transmission start / stop information transmitting unit,
The wireless communication system according to claim 1. The reflected wave reading unit starts transmission of an unmodulated carrier in response to reception of transmission start information, and stops transmission of an unmodulated carrier in response to reception of transmission stop information.
The wireless communication system according to claim 6. The transmission start / stop information transmission unit and the transmission start / stop information reception unit perform information communication via infrared communication or other communication media other than the back scatter method.
The wireless communication system according to claim 6. A wireless communication device that performs data communication by a back scatter method using absorption and reflection of received radio waves,
A device control function unit for processing a control command for remotely operating the device;
A data communication function unit for processing transmission data;
A reflected wave transmission unit that receives a non-modulated carrier and transmits a control command issued by the device control function unit and transmission data processed by the data communication function unit as a reflected wave signal obtained by back-scatter modulation;
A wireless communication apparatus comprising: The data communication function unit includes a storage medium for storing transmission data,
The reflected wave transmission unit transmits the data read from the storage medium as a reflected wave signal obtained by back scatter modulation,
The wireless communication apparatus according to claim 9. The data communication function unit includes a storage medium interface that removably receives an external storage medium that stores transmission data.
The wireless communication apparatus according to claim 9. A transmission start / stop information transmission unit for transmitting information on the start and stop of transmission by the reflected wave transmission unit;
The wireless communication apparatus according to claim 9. The transmission start / stop information transmission unit performs information communication via infrared communication or other communication media other than the back scatter method.
The wireless communication apparatus according to claim 12. A wireless communication device that performs data communication by receiving a backscatter-modulated reflected wave signal,
A reflected wave reading unit that transmits an unmodulated carrier and that receives and demodulates a back scatter modulated reflected wave signal;
A device main body for performing a predetermined device operation;
A wireless communication apparatus comprising: The device main body performs device operation according to a control command received as a reflected wave signal.
The wireless communication apparatus according to claim 14. The device body performs reproduction output of transmission data received as a reflected wave signal.
The wireless communication apparatus according to claim 14. A transmission start / stop information receiving unit that receives information related to transmission start and stop of the back scatter modulated reflected wave signal;
The wireless communication apparatus according to claim 14. The reflected wave reading unit starts transmission of an unmodulated carrier in response to reception of transmission start information and stops transmission of an unmodulated carrier in response to reception of transmission stop information.
The wireless communication apparatus according to claim 17. The transmission start / stop information receiving unit performs information communication via infrared communication or other communication media other than the back scatter method.
The wireless communication apparatus according to claim 17.

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