JP2008048119A - Radio terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio terminal device capable of performing wide-band and long-range data transmission. <P>SOLUTION: The radio terminal device 100 includes a first millimeter wave transmitting and receiving means 11 and a second millimeter wave transmitting and receiving means 12 of transmitting and receiving radio waves of a millimeter band, a data transmitter receiver 13 which transmits and receives data, a microwave transmitter receiver 14 which transmits and receives a radio wave of a microwave band, a position information acquiring means 15 of acquiring position information, and a terminal control means 20 of performing control associated with the transmission and reception of the data. The first millimeter wave transmitting and receiving means 11 and second millimeter wave transmitting and receiving means 12 have directional antennas 11a and 12a respectively, and the terminal control means 20 has a directivity control unit 21 which controls directivities of the directional antennas 11a and 12a based upon the position information, a communication state monitoring unit 22 which monitors a communication state, and a route searching unit 23 which makes a route search, and a transmission power adjusting unit 24 which adjusts transmission power. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wireless terminal device that performs multi-hop communication using a wireless ad hoc network, for example.

  A wireless ad hoc network is a network that is autonomously formed by a plurality of wireless terminal devices, and can flexibly change the transmission path according to the situation of movement, new participation, departure, etc. of the wireless terminal device. Network. In a conventional wireless ad hoc network, for example, a radio wave in the microwave band is used based on the IEEE 802.11 standard, which is a standard of a wireless LAN (Local Area Network). Recently, techniques for transmitting data streams such as video and audio using this wireless ad hoc network have been studied (see Non-Patent Document 1, for example).

On the other hand, a system for transmitting data using millimeter-wave radio waves having a wider band than microwave radio waves has been studied. For example, the millimeter-wave ad hoc wireless access system described in Non-Patent Document 2 uses a millimeter-band radio wave to generate a large-capacity presentation file in an office, electronic brochure data at an exhibition hall, etc. in a microwave band. It is possible to transmit at higher speeds.
H. Fujisawa et al. , "Route Selection using Retransmission Packets for Video Streaming on AdHoc Networks", IEEE Radio & Wireless Symposium 2006 Hamaguchi et al., "Millimeter-wave ad hoc wireless access system III", 2004 IEICE General Conference B-5-283

  However, although the one shown in Non-Patent Document 2 can achieve a wide band in an indoor LAN for short-range communication up to about 10 m, the propagation loss of millimeter wave radio waves is that of the microwave band. Therefore, there is a problem that it cannot be applied to a transmission that is assumed to be transmitted over a relatively long distance outdoors.

  The present invention has been made in order to solve the conventional problems, and an object of the present invention is to provide a wireless terminal device capable of transmitting data over a longer range and in a wider band than the conventional one.

  A wireless terminal device according to the present invention is a wireless terminal device constituting a wireless network in which a route for transmitting the data is autonomously established between a data transmission source and a transmission destination, The data transmission / reception means for transmitting / receiving the data, and the control information transmission / reception means for transmitting / receiving control information related to the transmission / reception of the data by a radio wave having a second frequency different from the first frequency are provided.

  With this configuration, the wireless terminal device of the present invention can use a combination of a broadband first frequency radio wave suitable for data transmission / reception and a second frequency radio wave suitable for control information transmission / reception. In a wireless network in which is established autonomously, it is possible to transmit data over a longer distance and wider than conventional ones.

  Moreover, the radio | wireless terminal apparatus of this invention has the structure where the said control information transmission / reception means contains an omnidirectional antenna.

  With this configuration, the wireless terminal device of the present invention can easily transmit and receive control information without controlling the directivity of the antenna.

  Furthermore, the wireless terminal device according to the present invention provides the radio wave of the first frequency and the radio wave of the second frequency so that the communicable distance by the radio wave of the first frequency is substantially equal to the communicable distance by the radio wave of the second frequency. The transmission power adjustment means for adjusting the transmission power is provided.

  With this configuration, the wireless terminal device of the present invention can substantially match the transmission characteristics of the first frequency radio wave and the second frequency radio wave, so that the first frequency is based on the control information by the second frequency radio wave. It is possible to suitably carry out data transmission using radio waves.

  Furthermore, the wireless terminal device of the present invention has a configuration provided with route search means for searching for a route for transmitting the data using the radio wave of the second frequency.

  With this configuration, the wireless terminal device of the present invention can easily perform a route search using a radio wave of the second frequency suitable for transmission / reception of control information.

  Further, in the wireless terminal device according to the present invention, the route search means includes a plurality of route setting sections for setting a plurality of routes for transmitting the data, and the data transmitting / receiving means transmits the same data for each of the plurality of routes. It has a configuration for transmitting and receiving.

  With this configuration, the wireless terminal device of the present invention can transmit the same data via a plurality of routes, so that even if data being transmitted on one route is lost, the data can be supplemented on another route. Therefore, it is possible to prevent quality degradation of video and audio due to data loss in the transmission destination device.

  Furthermore, the wireless terminal device of the present invention includes a communication state monitoring unit that monitors a communication state of the route, and the route search unit transmits the data when the communication state of the route is a predetermined state. Is re-searched.

  With this configuration, the wireless terminal device of the present invention re-searches for a new route when the communication state of the route during data transmission deteriorates. Therefore, data transmission can always be performed using a route with a good communication state. it can.

  Furthermore, the wireless terminal device of the present invention has a configuration including position information acquisition means for acquiring position information of at least one of the partner device that is the partner device that transmits and receives the data and the device itself.

  With this configuration, the wireless terminal device of the present invention acquires position information of the counterpart device and the device itself. Therefore, when a directional antenna is used as an antenna for transmitting and receiving a radio wave of the first frequency, the directivity direction of the directional antenna Can be easily controlled.

  Furthermore, the radio terminal device of the present invention has a configuration in which the radio wave of the first frequency is a radio wave in the millimeter wave band, and the radio wave of the second frequency is a radio wave in the microwave band.

  With this configuration, the wireless terminal device of the present invention can transmit data using millimeter-wave radio waves having broadband characteristics and transmit control information using microwave-band radio waves. In an established wireless network, it is possible to transmit data over a longer distance with a wider band than conventional ones.

  The present invention can provide a wireless terminal device having an effect that data transmission can be performed over a longer distance and in a wider band than conventional ones.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. An example in which the wireless terminal device of the present invention is applied to a wireless ad hoc network that transmits a data stream such as video and audio (hereinafter referred to as “video data”) will be described.

(First embodiment)
In describing the configuration of the present embodiment, it is assumed that the wireless terminal device according to the present invention forms a wireless ad hoc network system 300 as shown in FIG. That is, the wireless ad hoc network system 300 includes a wireless terminal device 110 that is a transmission source of video data, the wireless terminal device 100 that is a relay terminal device for video data, and a wireless terminal device 120 that is a transmission destination of video data. It consists of and. Each of the wireless terminal devices 100, 110, and 120 includes a microwave band antenna and a millimeter wave band antenna. In addition, in FIG. 1, a plurality of circles drawn by broken lines indicate the communicable ranges that can be communicated by millimeter wave radio waves, and the communicable ranges 101, 111, and 121 are respectively the wireless terminal device 100. , 110 and 120 show the communicable range by millimeter wave radio waves.

  Next, the configuration of the wireless terminal device according to the first embodiment of the present invention will be described. The configuration will be described below by taking the wireless terminal device 100 as the relay terminal device shown in FIG. 1 as an example, but the wireless terminal devices 110 and 120 have the same configuration as the wireless terminal device 100.

  As shown in FIG. 2, the wireless terminal device 100 according to the present embodiment includes a first millimeter-wave transmission / reception unit 11 and a second millimeter-wave transmission / reception unit 12 that transmit and receive millimeter-wave radio waves including data such as video, video, etc. A data transmitting / receiving unit 13 for transmitting / receiving data, a microwave transmitting / receiving unit 14 for transmitting / receiving microwave waves, a position information acquiring unit 15 for acquiring position information of the own device and a partner device communicating with the own device, and video And terminal control means 20 for performing control related to transmission and reception of equal data.

  Here, the millimeter wave band radio wave refers to a radio wave having a frequency of 30 GHz to 300 GHz, and the microwave band radio wave refers to a radio wave having a frequency of 3 GHz to 30 GHz. Note that the first frequency radio wave described in the claims corresponds to a millimeter wave radio wave, and the second frequency radio wave corresponds to a microwave radio wave. In the following description, a line that transmits and receives video data using millimeter wave radio waves is referred to as a “main line”, and a line that transmits and receives control information using microwave radio waves is referred to as a “control line”. In FIG. 1, bold arrows indicate the flow of data such as video, and other arrows indicate the flow of control information.

  The first millimeter wave transmission / reception means 11 is configured to receive millimeter wave radio waves including video data from the wireless terminal apparatus 110 in the present embodiment (see FIG. 1). That is, the first millimeter wave transmission / reception means 11 includes a directional antenna 11a that captures millimeter-wave radio waves transmitted from the wireless terminal device 110, a millimeter-wave transmission / reception unit 11b that receives millimeter-wave radio waves, and directivity. And an antenna driving unit 11c for setting the directivity direction of the antenna 11a.

  The directional antenna 11a is configured by an antenna having directivity such as a parabolic antenna, a horn type antenna, a phased array antenna, and the like, and captures millimeter-wave radio waves output from the wireless terminal device 110. Yes. In the following description, the directional antenna 11a is assumed to be a parabolic antenna.

  The millimeter wave transmission / reception unit 11b includes a millimeter wave band modulation circuit and demodulation circuit, a transmission / reception switching circuit for switching connection between the directional antenna 11a and the modulation circuit and demodulation circuit, and the like.

  The antenna driving unit 11 c includes a rotation driving unit that mechanically drives the directional antenna 11 a to be directed toward the wireless terminal device 110 based on a signal output from the directivity control unit 21 described later.

  In the present embodiment, the second millimeter wave transmitting / receiving means 12 is configured to transmit a millimeter wave band radio wave including data such as video to the wireless terminal device 120 (see FIG. 1). That is, the second millimeter wave transmission / reception means 12 includes a directional antenna 12a that radiates millimeter-wave radio waves toward the wireless terminal device 120, a millimeter-wave transmission / reception unit 12b that transmits millimeter-wave radio waves, and a directional antenna. And an antenna driving unit 12c for setting the directivity direction of 12a. The configuration of the second millimeter wave transmission / reception means 12 is the same as that of the first millimeter wave transmission / reception means 11, and detailed description thereof is omitted. The first millimeter wave transmission / reception means 11 and the second millimeter wave transmission / reception means 12 constitute the data transmission / reception means of the present invention.

  The data transmission / reception unit 13 receives video and other data received and demodulated by the first millimeter-wave transmission / reception unit 11 in this embodiment, and transmits the received data to the second millimeter-wave transmission / reception unit 12.

  The microwave transmission / reception unit 14 includes an omnidirectional antenna 14a, and transmits / receives control information related to transmission of data such as video with radio terminals 110 and 120 using microwave waves. The microwave transmission / reception unit 14 constitutes the control information transmission / reception means of the present invention.

  As described above, in this embodiment, the frequency of radio waves for transmitting and receiving data such as video is set higher than the frequency of radio waves for transmitting and receiving control information. However, the present invention is not limited to this. . For example, considering transmission power and antenna gain, the frequency of radio waves for transmitting and receiving video data does not necessarily have to be higher, and the video and other data is transmitted and received at a frequency lower than the frequency of radio waves for transmitting and receiving control information. It is good.

  The position information acquisition unit 15 includes, for example, a GPS (Global Positioning System) unit, and acquires position information of its own device including latitude and longitude information. In addition, the location information acquisition unit 15 transmits the acquired location information of the own device to the wireless terminal devices 110 and 120 that are communication partners via the microwave transmission / reception unit 14, and the location of the wireless terminal devices 110 and 120. Get information.

  The terminal control means 20 includes a directivity control unit 21 that controls the directivity of the directional antennas 11a and 12a based on the position information, a communication state monitoring unit 22 that monitors a communication state using millimeter wave radio waves, and a route search. And a transmission power adjustment unit 24 that adjusts the transmission power of millimeter wave radio waves and microwave radio waves.

  The directivity control unit 21 receives the position information of the wireless terminal devices 110 and 120 and the position information of the own device from the position information acquisition unit 15, and determines the directivity of the directivity antennas 11a and 12a based on the received position information. A signal for control is generated and output.

  The communication state monitoring unit 22 is connected to the millimeter wave transmission / reception units 11b and 12b, and monitors the communication state of the main line by monitoring the reception level of radio waves in the millimeter wave band, for example. Further, when the reception level of the main line becomes equal to or lower than the threshold value, that is, when the communication state of the main line is deteriorated, the communication state monitoring unit 22 signals (hereinafter “communication state deterioration signal”). Is output to the route search unit 23. The communication status monitoring unit 22 constitutes a communication status monitoring unit of the present invention.

  As described above, in this embodiment, the deterioration of the communication state of the main line is determined by the decrease in the radio wave reception level, but the present invention is not limited to this. Deterioration of the communication status of this line is not only indicated by a decrease in the reception level of radio waves, but the communication status may deteriorate due to the influence of reflected waves or interference waves even when the reception level is high. The communication status monitoring unit 22 may be configured to monitor the communication status of the main line by monitoring the loss rate, bit error rate, and the like. The predetermined communication state described in the claims means a state in which, for example, the reception level, packet loss rate, bit error rate, etc. of this line are below a threshold value.

  The route search unit 23 generates a route search packet for performing a route search, and searches for a route for transmitting data such as video by sending the route search packet to a control line using a microwave band radio wave. The route is set. Further, when the route search unit 23 receives a communication state deterioration signal from the communication state monitoring unit 22, the route search unit 23 newly searches for a route having a good communication state in place of the main line in use. The route search unit 23 constitutes route search means of the present invention.

  The transmission power adjustment unit 24 adjusts the transmission power of the first millimeter wave transmission / reception unit 11, the second millimeter wave transmission / reception unit 12, and the microwave transmission / reception unit 14. Propagation characteristics are different between the control line using microwave waves and the main line using millimeter waves, and the result of the route search using the microwave waves is the main line using millimeter waves. Therefore, the transmission power adjustment unit 24 is included in the transmission. The transmission power adjustment unit 24 constitutes transmission power adjustment means of the present invention.

  Specifically, as shown in FIG. 3 (a), the transmission power adjusting unit 24 sets the main line so that the communicable distance (broken line) of the control line and the communicable distance (solid line) of the main line are substantially equal. The transmission power and the transmission power of the control line are adjusted. At this time, if transmission of the main line is performed using the route searched using the control line, it is necessary to be error-free, so the transmission power adjustment unit 24, as shown in FIG. When paying attention to the transmission distance vs. packet loss rate, adjustment is made so that transmission on this line is error-free in the range where the packet loss rate of the control line is not 100%, that is, in the range where the route search on the control line is established. It has become.

  Next, the operation of radio terminal apparatus 100 in the present embodiment will be described.

  As shown in FIG. 4, first, the transmission power adjustment unit 24 adjusts the transmission power of the main line and the transmission power of the control line (step S11). As a result, the range in which communication can be performed using millimeter wave radio waves and the range in which communication using microwave band radio waves can be substantially matched.

  Next, a route search is executed by the route search unit 23 (step S12). This route search will be described with reference to FIG.

  In describing the route search, it is assumed that a wireless ad hoc network is configured by the wireless terminal devices S, D, and ac as shown in FIG. Here, the wireless terminal device S corresponds to the wireless terminal device 110 that is the transmission source of data such as video in FIG. The wireless terminal device D corresponds to the wireless terminal device 120 that is the transmission destination of data such as video in FIG. The wireless terminal devices a to c represent relay terminal devices that relay data such as video between the wireless terminal devices S and D. For example, the wireless terminal device a corresponds to the wireless terminal device 100 in FIG. To do. Note that the route search processing shown in FIG. 5 is executed using a control line.

  First, a route search packet for searching for a route is transmitted to the wireless terminal devices a and b by the wireless terminal device S as the transmission source terminal device (FIG. 5A). This route search packet includes transmission source address information indicating that the transmission source terminal device is the wireless terminal device S and destination address information indicating that the destination terminal device is the wireless terminal device D.

  Next, the destination address information of the received route search packet is referred to by the wireless terminal devices a and b, respectively. Here, since the destination address information is different from the address information of the own device, the radio terminal device a is the next device by describing the address information of the own device as a relay terminal device in a predetermined area of the route search packet. Forward to D. Similarly, the wireless terminal device b also describes its own address information in a predetermined area of the route search packet and transfers it to the wireless terminal device c, which is the next device. Further, the wireless terminal device c also describes its own address information in a predetermined area of the route search packet and transfers it to the wireless terminal device D (FIG. 5B).

  As a result, the search packet is received by the wireless terminal device D which is the destination terminal device. Next, the wireless terminal device D transmits a route reply packet including route information based on the address information described in the route search packet toward the wireless terminal device S (FIG. 5C).

  Then, the wireless terminal device S as the transmission source terminal device sets the route of the wireless terminal device S → a → D as a temporary main line based on the route information described in the route reply packet received first. (FIG. 5D). Information indicating the temporary main line is transmitted to the wireless terminal devices a to c and S using the control line.

  Returning to FIG. 4, the description of the operation of the wireless terminal device 100 is continued.

  After the main line is set as described above, the position information acquisition unit 15 acquires the position information of the wireless terminal devices 110 and 120 and the position information of the own device (step S13). It is output to the directivity control unit 21.

  Next, the directivity control unit 21 outputs a signal for controlling the directivity of the directional antennas 11a and 12a to the antenna driving units 11c and 12c based on the position information acquired by the position information acquisition unit 15, and the directivity Control is performed (step S14). Specifically, the antenna drive unit 11c is configured so that the directivity direction of the directional antenna 11a faces the direction of the wireless terminal device 110, specifically, the directional antenna 11a has the highest gain with respect to the wireless terminal device 110. Is driven to rotate. Similarly, the antenna drive unit 12 c rotationally drives the directional antenna 12 a so that the directional direction of the directional antenna 12 a is directed toward the wireless terminal device 120.

  Subsequently, the first millimeter-wave transmission / reception means 11 and the second millimeter-wave transmission / reception means 12 confirm whether or not the route of this line can be normally communicated (step S15). Specifically, for example, the first millimeter-wave transmission / reception means 11 transmits a route confirmation packet to the main line, and receives a notification via the control line that the route confirmation packet has arrived at the wireless terminal device 110, so that wireless communication is performed. It can be understood that normal communication is possible on the main line between the terminal device 100 and the wireless terminal device 110.

  If it is determined in step S15 that the route of this line is not normally communicable, for example, if there is an obstacle between the wireless terminal device 100 and the wireless terminal device 110, the process returns to step S12 and the route is returned. Re-searched.

  On the other hand, when it is determined in step S15 that the route of the main line can be normally communicated, the data transmitting / receiving unit 13 transmits data such as video via the main line (step S16).

  Next, the communication status monitoring unit 22 determines whether or not the communication status of the main line has deteriorated (step S17). Here, if it is determined that the communication state of the main line has deteriorated, the process returns to step S12, and the route is re-searched. If it is not determined that the communication state of the main line has deteriorated, the data transmitting / receiving unit 13 It is determined whether or not the data transmission has been completed (step S18).

  If it is determined in step S18 that the data transmission has been completed, the data transmission process is terminated. If it is not determined that the data transmission has been completed, the process returns to step S16.

  As described above, according to radio terminal apparatus 100 in the present embodiment, first millimeter-wave transmission / reception means 11 and second millimeter-wave transmission / reception means 12 use the directional antennas 11a and 12a, respectively. In the wireless network in which the wireless communication path is autonomously established, the microwave transmission / reception unit 14 is configured to transmit and receive control information using the omnidirectional antenna 14a. It is possible to transmit data over a long distance with a wider band than those.

  In the above-described embodiment, the directional antenna 11a is assumed to be a parabolic antenna, and the antenna driving unit 11c is described as mechanically driving the directional antenna 11a. For example, when the directional antenna 11 a is configured by a phased array antenna, the antenna driving unit 11 c is electrically controlled in the direction of the phased array antenna and directed toward the wireless terminal device 110. It can be set as the structure provided with the directivity control part to be made. In this case, directivity can be controlled at a higher speed than that mechanically rotationally driven. The same applies to the directional antenna 12a.

  Further, in the above-described embodiment, the example in which millimeter wave band radio waves are used for the main line and microwave band radio waves are used for the control line has been described, but the present invention is not limited thereto, For example, the same effect can be obtained by using a radio wave having a higher frequency in the microwave band for the main line and a radio wave having a lower frequency in the microwave band for the control line.

  Further, in the above-described embodiment, the example using the microwave band radio wave for the control line has been described. However, the present invention is not limited to this, for example, the UHF band (300 MHz to 3 GHz), the VHF band, and the like. The same effect can be obtained by using a radio wave of (30 MHz to 300 MHz) and HF band (3 MHz to 30 MHz).

  Further, in the above-described embodiments, the wireless terminal devices 100, 110, and 120 have been described by taking the example of the configuration including the transmitting / receiving directional antenna that transmits and receives millimeter wave radio waves. However, one of the antennas that transmit or receive millimeter-wave radio waves may be a directional antenna and the other may be an omnidirectional antenna.

  In the above-described embodiment, the position information acquisition unit 15 has been described as including a GPS unit. However, the present invention is not limited to this. For example, a position information acquisition unit 40 as shown in FIG. 6 can be used instead of the position information acquisition unit 15 in the present embodiment. In FIG. 6, a position information acquisition unit 40 includes an LED (Light Emitting Diode) lamp 40a indicating the position of the own device, an LED control unit 40b that controls the driving of the LED, and a destination device (FIG. 6, an omnidirectional camera 40 c that captures the wireless terminal device 110), an image recognition processing unit 40 d that recognizes the position of the wireless terminal device 110 by performing image processing on an image captured by the omnidirectional camera 40 c, and the wireless terminal device 110 A position information acquisition unit 40e that acquires position information.

  For example, the LED control unit 40b is configured to drive the LED lamp based on a blinking pattern of the LED lamp predetermined for each wireless terminal device, and the image recognition processing unit 40d is taken by the omnidirectional camera 40c. The light of the LED lamp included in the wireless terminal device 110 is extracted from the image, and the direction in which the light is emitted is recognized as the direction of the wireless terminal device 110. Here, the direction of the wireless terminal device 110 is indicated by an angle with respect to a predetermined direction, for example. The position information acquisition unit 40e generates a signal for operating the LED control unit 40b and outputs a signal indicating the direction of the wireless terminal device 110 acquired by the image recognition processing unit 40d to the directivity control unit 21 of the terminal control unit 20. It is supposed to be. With this configuration, the direction of the wireless terminal device 110 can be recognized. Although not shown, the position information acquisition unit 40e can recognize the direction of the wireless terminal device 120 in the same manner as the recognition of the direction of the wireless terminal device 110.

  Further, as shown in FIG. 7, the direction of the wireless terminal device 110 can be grasped by scanning a directional antenna. FIG. 7 illustrates a case where the wireless terminal device 110 includes an omnidirectional antenna. The wireless terminal device 100 rotates and drives the directional antenna 11a, and the received power of radio waves from the wireless terminal device 110 is increased. The maximum direction can be recognized as the direction of the wireless terminal device 110. Even when the wireless terminal device 110 includes a directional antenna, the wireless terminal devices 100 and 110 scan the directional antennas so that the reception power of radio waves from the other party is maximized. You can recognize the previous direction.

(Second Embodiment)
First, the configuration of the wireless terminal device according to the second embodiment of the present invention will be described.

  As shown in FIG. 8, radio terminal apparatus 200 in the present embodiment includes terminal control means 30 in place of terminal control means 20 of radio terminal apparatus 100 (see FIG. 2) in the first embodiment. Since the configuration other than the terminal control unit 30 is the same as that of the wireless terminal device 100 in the first embodiment, the same reference numerals are given and description thereof is omitted.

  The terminal control unit 30 includes a directivity control unit 31 that controls the directivity of the directional antennas 11a and 12a based on the position information, a communication state monitoring unit 32 that monitors a communication state using millimeter wave radio waves, and a route search. And a transmission power adjustment unit 34 that adjusts the transmission power of millimeter wave radio waves and microwave radio waves. The directivity control unit 31, the communication state monitoring unit 32, and the transmission power adjustment unit 34 correspond to the directivity control unit 21, the communication state monitoring unit 22, and the transmission power adjustment unit 24 in the first embodiment, respectively. Detailed description will be omitted.

  The route search means 33 includes a route search unit 33a for searching for a route and a multiple route setting unit 33b for setting a plurality of routes. Here, since the route search part 33a respond | corresponds with the route search part 23 in 1st Embodiment, detailed description is abbreviate | omitted.

  The multiple route setting unit 33b is configured to set, for example, two routes among the routes searched by the route search unit 33a as main routes. For example, the route search unit 33a refers to the result of the route search using the control line as shown in FIG. 9A, and the multiple route setting unit 33b As shown in 9 (b), as the main line, the first main line of the wireless terminal device S → a → d → D and the second main line of the wireless terminal device S → b → f → D are determined. It has become.

  Next, the operation of radio terminal apparatus 200 in the present embodiment will be described. In addition, the operation | movement which concerns on the route search means 33 is demonstrated, and description is abbreviate | omitted about another operation | movement.

  First, a first route search is executed by the route search unit 33a, and two main lines are set by the multiple route setting unit 33b in the order in which the route reply packets are returned early (step S21).

  Next, the data transmission / reception unit 13 transmits the same data such as video through the set two main lines (step S22).

  Furthermore, the communication status monitoring unit 32 monitors the reception levels of the two main lines, and determines whether the communication status of the two main lines has deteriorated (step S23).

  If it is determined in step S23 that the communication status of the two main lines has not deteriorated, the process returns to step S22.

  If it is determined in step S23 that one of the communication states of the two main lines has deteriorated, the route search unit 33a performs route re-search (step S24), and the route whose communication state has deteriorated is newly determined. The route is changed (step S25), and the process returns to step S22.

  Furthermore, when it is determined in step S23 that both the communication states of the two main lines have deteriorated, the route search unit 33a performs route re-search and sets the two main lines (step S26). Both routes that have deteriorated are changed to new routes (step S27), and the process returns to step S22.

  As described above, when transmission is performed through two routes, the routes are joined at the destination terminal device. In this case, two packets with the same contents are input. Therefore, when a packet with the same contents arrives, a predetermined process is performed only on the packet that arrives first, and the packet that arrives later It is preferable to discard all. For example, in the case of IP (Internet Protocol) transmission, it is possible to identify whether or not the packets have the same content by referring to the identifier of the packet header. This is also possible by using a similar identifier in a transmission method other than IP, or by adding an identifier that can newly identify a packet to the header portion. In the relay terminal apparatus, there are cases where the paths merge, but it is preferable to discard the same packet as described above if the paths after the merge are the same.

  As described above, according to radio terminal apparatus 200 in the present embodiment, route search means 33 includes route search unit 33a for searching for a route and multiple route setting unit 33b for setting a plurality of routes. Since the route setting unit 33b is configured to set, for example, two routes among the routes searched by the route search unit 33a as the main route, the route setting unit 33b restarts a new route when the communication state of the route during data transmission deteriorates. It is possible to search, and data transmission can always be performed through a route having a good communication state.

  As described above, the wireless terminal device according to the present invention has an effect that data transmission can be performed over a long distance with a wider band than the conventional one, and a wireless network in which a route for transmitting data is autonomously established is configured. It is useful as a wireless terminal device.

The figure which shows the structure of the radio | wireless ad hoc network system in 1st Embodiment of the radio | wireless terminal apparatus which concerns on this invention. The block diagram which shows the structure in 1st Embodiment of the radio | wireless terminal apparatus which concerns on this invention The figure which shows the example of adjustment of the communicable distance in 1st Embodiment of the radio | wireless terminal apparatus which concerns on this invention (a) Adjustment explanatory drawing of communicable distance (b) An example of the relationship between transmission distance and a packet loss rate is shown. Figure The flowchart which shows the operation | movement in 1st Embodiment of the radio | wireless terminal apparatus which concerns on this invention. Explanatory drawing which shows the setting step of the path | route in 1st Embodiment of the radio | wireless terminal apparatus which concerns on this invention The block diagram which shows the other structural example of a positional information acquisition means in 1st Embodiment of the radio | wireless terminal apparatus which concerns on this invention. FIG. 3 is a schematic diagram showing an example of a partner device search operation by scanning a directional antenna in the first embodiment of the wireless terminal device according to the present invention; The block diagram which shows the structure in 2nd Embodiment of the radio | wireless terminal apparatus which concerns on this invention. Explanatory drawing which shows the setting step of the path | route in 2nd Embodiment of the radio | wireless terminal apparatus which concerns on this invention. The flowchart which shows the operation | movement which concerns on route search in 2nd Embodiment of the radio | wireless terminal apparatus which concerns on this invention.

Explanation of symbols

11 First millimeter wave transmission / reception means (data transmission / reception means)
11a, 12a Directional antenna 11b, 12b Millimeter wave transceiver 11c, 12c Antenna driver 12 Second millimeter wave transceiver (data transceiver)
13 Data transceiver 14 Microwave transceiver (control information transceiver)
14a Non-directional antenna 15 Position information acquisition means 20, 30 Terminal control means 21, 31 Directivity control part 22, 32 Communication state monitoring part (communication state monitoring part)
23, 33a Route search unit (route search means)
24, 34 Transmission power adjustment unit (transmission power adjustment means)
33 Route search means 33b Multiple path setting section 40 Position information acquisition means 40a LED lamp 40b LED control section 40c Omnidirectional camera 40d Image recognition processing section 40e Position information acquisition sections 100, 110, 120, 200 Wireless terminal apparatuses 101, 102, 103 Communication range 300 Wireless ad hoc network system

Claims (8)

A wireless terminal device constituting a wireless network in which a route for transmitting the data is autonomously established between a data transmission source and a transmission destination,
Data transmission / reception means for transmitting / receiving the data using radio waves of a first frequency, and control information transmission / reception means for transmitting / receiving control information related to transmission / reception of the data using radio waves of a second frequency different from the first frequency. A wireless terminal device. The wireless terminal apparatus according to claim 1, wherein the control information transmitting / receiving means includes an omnidirectional antenna. Transmission power adjusting means for adjusting the transmission power of the first frequency radio wave and the second frequency radio wave so that the communicable distance by the first frequency radio wave is substantially equal to the communicable distance by the second frequency radio wave. The wireless terminal device according to claim 1, further comprising: The wireless terminal device according to any one of claims 1 to 3, further comprising route search means for searching for a route for transmitting the data using a radio wave of the second frequency. The route search means includes a plurality of route setting units for setting a plurality of routes for transmitting the data,
The wireless terminal apparatus according to claim 4, wherein the data transmitting / receiving unit transmits / receives the same data for each of the plurality of paths. Comprising communication state monitoring means for monitoring the communication state of the path;
The wireless terminal apparatus according to claim 4 or 5, wherein the route search unit re-searches a route for transmitting the data when a communication state of the route is a predetermined state. 7. The apparatus according to claim 1, further comprising position information acquisition means for acquiring position information of at least one of a partner apparatus that is a partner to which the data is transmitted and received and the self apparatus. The wireless terminal device described. The radio wave of the first frequency is a radio wave of a millimeter wave band, and the radio wave of the second frequency is a radio wave of a microwave band, according to any one of claims 1 to 7, Wireless terminal device.

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