JP6509962B2 - Wireless communication system and wireless communication method - Google Patents

Description

  Embodiments of the present invention relate to a wireless communication system and a wireless communication method.

  A technology for performing reliable communication with a mobile by transmitting data from the mobile using a plurality of routes is conventionally known. In addition, there is conventionally known a technique in which an authentication server for shortening connection time is provided and authentication server performs authentication in advance to omit part of connection processing such as authentication at the time of handover.

JP, 2016-127447, A JP, 2016-44001, A

  However, in the prior art, it has been difficult to further shorten the communication reconnection processing time as the mobile moves.

The wireless communication system according to the embodiment includes a control device, a plurality of wireless base stations mounted on a mobile, and a plurality of wireless communication devices installed in the route of the mobile. The plurality of radio base stations periodically transmit beacon frames including the same network identification information. It said controller, when said moving body is moving, the transmission frequency of a beacon frame transmitted from the plurality of radio base stations, higher than when the movable body is stopped. The plurality of wireless communication devices receive the beacon frame.

FIG. 2 is a diagram showing an example of a device configuration of the wireless communication system of the first embodiment. The figure which shows the example of a function structure of the wireless base station of 1st Embodiment. FIG. 2 is a view showing an example of the functional configuration of the wireless communication apparatus of the first embodiment. The figure which shows the example of the apparatus structure of the radio | wireless communications system of 2nd Embodiment. The figure which shows the example of an apparatus structure of the radio | wireless communications system of 3rd Embodiment. The figure which shows the example of a function structure of the control apparatus of 3rd Embodiment. FIG. 7 is a diagram showing an example of a hardware configuration of main parts of a wireless base station, a wireless communication device, and a control device according to the first to third embodiments.

  Hereinafter, embodiments of a wireless communication system and a wireless communication method will be described in detail with reference to the accompanying drawings.

First Embodiment
First, an example of a device configuration of the wireless communication system according to the first embodiment will be described.

[Example of Device Configuration of Wireless Communication System]
FIG. 1 is a diagram illustrating an example of a device configuration of the wireless communication system according to the first embodiment. The wireless communication system according to the first embodiment includes wireless base stations 10a and 10b, and wireless communication devices 20a to 20f.

  The radio base stations 10 a and 10 b are mounted on the mobile unit 30. The mobile unit 30 may be optional. In the first embodiment, the case where the moving body 30 is a car of an elevator will be described as an example. The moving body 30 is raised and lowered by a motor 50 controlled by a control panel 60 of the machine room 40.

  In the example of FIG. 1, the radio base station 10 a is installed below the mobile unit 30. The radio base station 10 b is installed on the upper part of the mobile unit 30. Since the mobile unit 30 itself is an upward shielding object, the wireless base station 10a can easily communicate with the wireless communication device 20 located below the wireless communication device 20 located above. On the other hand, since the mobile unit 30 itself is a shield in the downward direction, the radio base station 10b can easily communicate with the radio communication apparatus 20 in the upper direction than the radio communication apparatus 20 in the downward direction. Thereby, even when the moving body 30 moves, and even when there is a shield in the moving path of the moving body 30, at least one of the wireless communication devices 20a to 20f is at least one of the wireless base stations 10a and 10b. It can communicate with one another.

  The wireless communication devices 20a to 20f, the control panel 60, and the floor control panels 70a to 70d are communicably connected to one another by a bus or a network.

  Hereinafter, when the radio base stations 10a and 10b are not distinguished from one another, they are simply referred to as the radio base station 10. Similarly, when the wireless communication devices 20 a to 20 f are not distinguished, they are simply referred to as the wireless communication device 20. Similarly, when the landing consoles 70a to 70d are not distinguished from one another, they are simply referred to as the landing console 70.

  The wireless base station 10 is, for example, an access point (AP) compliant with IEEE 802.11. Also, the wireless communication device 20 is, for example, an IEEE 802.11 compliant station (STA). Although the case where the wireless standard is IEEE 802.11 is described as an example in the description of the first embodiment, the wireless standard may be compliant.

  The wireless base station 10 wirelessly communicates with the wireless communication device 20. The transmission target data transmitted from the wireless base station 10 to the wireless communication device 20 includes, for example, status information indicating the status of the mobile unit 30. The state information is, for example, information indicating the open / close state of the door of the elevator car when the moving body 30 is the elevator car.

  When the wireless communication device 20 receives a data frame including transmission target data from the wireless base station 10, the wireless communication device 20 transmits the transmission target data included in the data frame to the control board 60.

  The installation positions of the radio base stations 10a and 10b are not limited to the example of FIG. For example, both of the radio base stations 10 a and 10 b may be installed above the mobile unit 30. Thus, for example, the wireless communication device 20 located above the mobile unit 30 can communicate with the wireless base station 10 if it can be connected to any one of the wireless base stations 10. Similarly, both of the radio base stations 10 a and 10 b may be installed under the mobile unit 30. Also, for example, one radio base station 10 may be installed on each side of the mobile unit 30. Thereby, for example, when a shield is present on the right side of the mobile unit 30, if the wireless communication device 20 can connect to the wireless base station 10 installed on the left side, communication with the wireless base station 10 is performed. can do.

  Further, although the example of FIG. 1 illustrates the case where there are two wireless base stations 10, three or more wireless base stations 10 may be provided. Similarly, the number of wireless communication devices 20 may be arbitrary. For example, when the mobile unit 30 is a high-rise elevator car, etc., a plurality of wireless communication devices 20 may be installed at predetermined intervals, for example, on the side wall of the hoistway.

  Next, an example of a functional configuration of the radio base station 10 of the first embodiment will be described.

[Example of functional configuration of wireless base station]
FIG. 2 is a diagram showing an example of a functional configuration of the radio base station 10 of the first embodiment. The radio base station 10 of the first embodiment includes a communication unit 11 and a storage unit 12.

  The communication unit 11 periodically transmits a beacon frame as a notification signal. The beacon frame includes network identification information 101 identifying a wireless network established by the wireless base station 10. In addition, after the connection process with the wireless communication device 20 is completed, the communication unit 11 broadcasts a data frame including transmission target data and the network identification information 101 to the wireless communication device 20.

  The storage unit 12 stores information. The information stored in the storage unit 12 is, for example, network identification information 101. The network identification information 101 includes, for example, a MAC (Media Access Control) address of the wireless base station 10, a BSSID (Basic Service Set Identifier), and the like. The storage units 12 of the radio base stations 10a and 10b store the same network identification information 101. The storage unit 12 of the wireless base station 10b stores, for example, the same MAC address as the MAC address set in the wireless base station 10a, and stores the same BSSID as the BSSID set in the wireless base station 10a.

  Note that the wireless base station 10b may change the setting of the MAC address of its own device in advance to the MAC address of the wireless base station 10a, or may be transmitted by the communication unit 11 without changing the MAC address of its own device. The MAC address of the wireless base station 10a may be set as the source address included in the beacon frame.

  Upon receiving a beacon frame from a device operating as an AP, the wireless communication device 20 on the STA side starts connection processing with the AP if connection processing with the device has not been completed. The connection process with the AP includes the transmission of an authentication (Authentication) frame, a connection request (Association Request) frame, and the like.

  The network identification information 101 of the beacon frame transmitted from the wireless base station 10b operating as an AP is the same as the network identification information 101 of the beacon frame transmitted from the wireless base station 10a operating as an AP. Therefore, the wireless communication device 20 starts connection processing directed to the wireless base station 10a regardless of which beacon frame is received.

  When the wireless base station 10 a or 10 b receives an authentication frame, a connection request frame, and the like from the wireless communication device 20, the wireless base station 10 a or 10 b transmits an authentication frame and an association response frame, etc. corresponding to the frame. At this time, the wireless base station 10b may change the setting of the MAC address of its own device to the MAC address of the wireless base station 10a in advance, or the authentication frame and connection response may be made without changing the MAC address of its own device. The MAC address of the wireless base station 10a may be set to the transmission source address included in the frame or the like.

  When the wireless communication device 20 receives an authentication frame, a connection response frame, and the like from the wireless base station 10a or 10b, the connection process is completed.

  When the connection process is completed, the wireless communication device 20 operating as a STA can communicate with the wireless base stations 10a and 10b operating as an AP. The radio base stations 10a and 10b operating as AP broadcast transmit a data frame including the same transmission target data and the same network identification information 101. For example, the same MAC address (the MAC address of the wireless base station 10a) is set as the network identification information 101 in the transmission source address of the data frame transmitted by broadcast from the wireless base stations 10a and 10b.

  The first reason that the data frame is broadcasted is that data to be transmitted can be simultaneously transmitted to a plurality of wireless communication devices 20 operating as STAs. The second reason is that when a delivery acknowledgment (ACK) frame is transmitted from a plurality of STAs, the radio band becomes tight and frames transmitted using the radio band collide with one another. It is for.

  Next, an example of a functional configuration of the wireless communication device 20 according to the first embodiment will be described.

[Example of Functional Configuration of Wireless Communication Device]
FIG. 3 is a diagram illustrating an example of a functional configuration of the wireless communication device 20 according to the first embodiment. The wireless communication device 20 of the first embodiment includes a wireless communication unit 21, a storage control unit 22, a storage unit 23, and a wired communication unit 24.

  The wireless communication unit 21 communicates with the wireless base station 10a or 10b. For example, when the above-mentioned beacon frame is received from the radio base station 10a or 10b, for example, the radio communication unit 21 starts the connection process if the above-described connection process has not been performed yet. Also, for example, after the connection is established by the above-described connection processing, the wireless communication unit 21 receives the above-described data frame transmitted by broadcast from the wireless base station 10 a or 10 b.

  The storage control unit 22 performs storage control of information stored in the storage unit 23. The storage unit 23 stores, for example, the received data 102. The received data 102 stores data frames broadcasted from the radio base station 10a or 10b.

  Note that there is a possibility that data frames including the same transmission target data (the same data frame) may be redundantly received by the wireless communication unit 21. Therefore, for example, the storage control unit 22 discards the data frame including the transmission target data that has already been received, without storing the data frame in the reception data 102. Further, for example, the storage control unit 22 redundantly stores, in the received data 102, a data frame including transmission target data that has already been received.

  The storage unit 23 is used, for example, as a buffer when transferring data to be transmitted included in a data frame received by the wireless communication unit 21 to the control board 60 by the wired communication unit 24.

  The wired communication unit 24 reads transmission target data from the data frame stored in the reception data 102 of the storage unit 23, and transmits the transmission target data to the control board 60 via the bus or the network.

  As described above, in the wireless communication system of the first embodiment, the communication units 11 of the wireless base stations 10a and 10b use the same MAC address as the source address (the MAC address of the wireless base station 10a) as the network identification information 101. Broadcast a data frame containing the Thus, according to the wireless communication system of the first embodiment, if connection processing with any one of the wireless base stations 10a and 10b is completed, new connection processing becomes unnecessary. Therefore, it is possible to reduce the time when communication can not be performed by the connection process.

  Further, according to the wireless communication system of the first embodiment, if the wireless communication unit 21 of the wireless communication device 20 can communicate with any one of the wireless base stations 10a and 10b, the mobile unit 30 moves. Can also maintain communication. That is, it is possible to reduce the number of times that the already established wireless network is disconnected by moving the mobile unit 30.

  The series of connection processes are connection processes defined in the IEEE 802.11 standard, and when using a wireless standard other than the IEEE 802.11, the standard is followed.

  Also, in the description of the first embodiment described above, the case where the network identification information 101 is made the same by matching the network setting of the radio base station 10b with the network setting of the radio base station 10a has been described, but other methods The network identification information 101 may be identical. For example, the network identification information 101 may be made identical by matching the network setting of the radio base station 10a with the network setting of the radio base station 10b.

  Also, for example, the network identification information 101 may be made identical by unifying the network settings of the radio base stations 10a and 10b into predetermined settings. Specifically, for example, a MAC address unrelated to the MAC addresses of the wireless base stations 10a and 10b may be set as the network identification information 101 in the wireless base stations 10a and 10b.

Second Embodiment
Next, a second embodiment will be described. In the description of the second embodiment, the same descriptions as those of the first embodiment will be omitted, and parts different from the first embodiment will be described. Although the case of one mobile unit 30 has been described in the description of the first embodiment, a plurality of mobile units 30 may be provided. In the second embodiment, a case where there are two mobile bodies 30 will be described as an example.

[Example of Device Configuration of Wireless Communication System]
FIG. 4 is a view showing an example of a device configuration of the wireless communication system of the second embodiment. The wireless communication system of the second embodiment includes wireless base stations 10a to 10d and wireless communication devices 20a to 20f.

  In the second embodiment, different network identification information 101 is determined for each mobile unit 30. That is, the same network identification information 101 is included in the beacon frame and the data frame transmitted from the wireless base station 10 installed in the same moving body 30.

  The radio base stations 10a and 10b are mounted on a mobile unit 30a. The mobile unit 30a may be optional. In the second embodiment, the case where the mobile unit 30a is a car of an elevator will be described as an example. The moving body 30 a is moved up and down by a motor 50 a controlled by the control panel 60 of the machine room 40.

  The communication units 11 of the radio base stations 10a and 10b periodically transmit beacon frames as broadcast signals. The beacon frame includes network identification information 101 that identifies a wireless network established by the wireless base station 10a (wireless base station 10b). The communication unit 11 of the wireless base stations 10a and 10b broadcasts a data frame including transmission target data and the network identification information 101 to the wireless communication device 20 after the connection process with the wireless communication device 20 is completed. Do.

  On the other hand, the radio base stations 10c and 10d are mounted on the mobile unit 30b. Mobile 30b may be optional. In the second embodiment, the case where the mobile body 30b is a car of an elevator will be described as an example. The moving body 30 b is moved up and down by a motor 50 b controlled by the control panel 60 of the machine room 40.

  The communication units 11 of the radio base stations 10c and 10d periodically transmit beacon frames as broadcast signals. The beacon frame includes network identification information 101 identifying a wireless network established by the wireless base station 10c (wireless base station 10d). Further, the communication unit 11 of the wireless base stations 10c and 10d broadcasts a data frame including transmission target data and the network identification information 101 to the wireless communication device 20 after the connection process with the wireless communication device 20 is completed. Do.

  The wireless communication devices 20a to 20f, the control panel 60, and the floor control panels 70a to 70d are communicably connected to one another by a bus or a network.

  The wireless communication unit 21 of the wireless communication device 20 communicates with the wireless base stations 10a and 10b mounted on the mobile unit 30a or the wireless base stations 10c and 10d mounted on the mobile unit 30b.

  For example, when the above-mentioned beacon frame is received from the wireless base station 10a or 10b, for example, the wireless communication unit 21 of the wireless communication device 20 starts the connection process if the above-described connection process has not been performed yet. Also, for example, after the connection is established by the above-described connection processing, the wireless communication unit 21 of the wireless communication device 20 receives the above-described data frame transmitted by broadcast from the wireless base station 10 a or 10 b.

  Similarly, when the above-described beacon frame is received from, for example, the wireless base station 10c or 10d, the wireless communication unit 21 of the wireless communication device 20 starts the connection process if the above-described connection process has not been performed yet. Also, for example, after the connection is established by the above-described connection processing, the wireless communication unit 21 of the wireless communication device 20 receives the above-described data frame transmitted by broadcast from the wireless base station 10c or 10d.

  The wired communication unit 24 of the wireless communication device 20 reads transmission target data from the data frame stored in the reception data 102 of the storage unit 23 of the wireless communication device 20, and transmits the transmission target data to the control panel 60 via the bus or network. Send to

  As described above, in the wireless communication system according to the second embodiment, the communication units 11 of the wireless base stations 10a and 10b mounted on the mobile unit 30a periodically receive beacon frames including the same network identification information 101. Send. Similarly, the communication units 11 of the radio base stations 10c and 10d mounted on the mobile unit 30b periodically transmit beacon frames including the same network identification information 101.

  Therefore, according to the wireless communication system of the second embodiment, if communication with the wireless base station 10 mounted on the same mobile unit 30 is completed with connection processing with one of the wireless base stations 10 , No need for new connection processing.

  In the wireless communication system according to the second embodiment, the communication units 11 of the wireless base stations 10a and 10b mounted on the mobile unit 30a have the same MAC address as the source address as the network identification information 101 (for example, wireless base station Broadcast transmission of a data frame including the MAC address 10a). Similarly, the communication units 11 of the radio base stations 10c and 10d mounted on the mobile unit 30b are data frames including the same MAC address (for example, the MAC address of the radio base station 10c) in the source address as the network identification information 101. Broadcast.

  Therefore, according to the wireless communication system of the second embodiment, communication can be performed even if the mobile unit 30 moves, provided that it can communicate with any one of the wireless base stations 10 mounted on the same mobile unit 30. Can be maintained. That is, it is possible to reduce the number of times that the already established wireless network is disconnected by moving the mobile unit 30.

Third Embodiment
Next, a third embodiment will be described. In the description of the third embodiment, the description similar to that of the first embodiment will be omitted, and parts different from the first embodiment will be described. In the description of the third embodiment, the case of controlling the output of radio signals such as the above-described beacon frame and the above-described data frame in accordance with the movement state of the mobile unit 30 will be described.

[Example of Device Configuration of Wireless Communication System]
FIG. 5 is a diagram showing an example of a device configuration of the wireless communication system of the third embodiment. The wireless communication system of the third embodiment includes wireless base stations 10a and 10b, wireless communication devices 20a to 20f, and a control device 80. That is, the wireless communication system according to the third embodiment differs from the wireless communication system according to the first embodiment in that the wireless communication system according to the third embodiment further includes the control device 80.

  The radio base stations 10 a and 10 b and the control device 80 are mounted on the mobile unit 30. The mobile unit 30 may be optional. In the third embodiment, the case where the mobile unit 30 is a car of an elevator will be described as an example. The moving body 30 is raised and lowered by a motor 50 controlled by a control panel 60 of the machine room 40.

  The control device 80 is communicably connected to the radio base stations 10a and 10b by a bus or a network. The control device 80 controls the output of the radio base stations 10a and 10b that transmit radio signals (radio waves) such as the above-described beacon frame and the above-described data frame according to the movement state of the mobile unit 30.

[Example of functional configuration of control device]
FIG. 6 is a diagram showing an example of a functional configuration of the control device 80 of the third embodiment. The control device 80 of the third embodiment includes a determination unit 81 and an output control unit 82.

  The determination unit 81 determines the movement state of the moving body 30. In the third embodiment, since the moving body 30 is a car of an elevator, the moving state includes, for example, stopping, rising (moving up), and falling (moving down). In addition, the determination method of the movement state of the mobile body 30 may be arbitrary. The determination unit 81 acquires the movement state of the moving body 30 by communication from the control panel 60 via the wireless communication device 20, for example. Further, for example, the determination unit 81 determines the movement state of the mobile unit 30 estimated from the change of the received signal strength indicator (RSSI) or the like of the wireless signal received by the wireless communication device 20 by using the wireless communication device 20. It may be obtained from

  The output control unit 82 controls the output of the radio base stations 10 a and 10 b that transmit radio signals such as the above-described beacon frame and the above-described data frame according to the movement state of the mobile unit 30.

  For example, the output control unit 82 controls the transmission frequency of beacon frames transmitted from the radio base stations 10 a and 10 b according to the movement state of the mobile unit 30. Specifically, for example, when the mobile unit 30 is moving, the output control unit 82 causes the transmission frequency of the beacon frame to be higher than when the mobile unit 30 is stopped. Also, for example, when the mobile unit 30 is stopped, the output control unit 82 makes the transmission frequency of the beacon frame lower than when the mobile unit 30 is moving.

  When the mobile unit 30 is moving, a handover occurs in which the wireless communication device 20 connected to the wireless base station 10 is changed. When the output control unit 82 increases the transmission frequency of the beacon frame while the mobile unit 30 is moving, the wireless communication apparatus 20 can easily find the wireless base station 10. This allows the connection process to proceed smoothly.

  On the other hand, when the mobile unit 30 is stopped, the above-described handover hardly occurs. The output control unit 82 can suppress unnecessary radio wave interference by lowering the transmission frequency of the beacon frame while the mobile unit 30 is stopped. Thus, the communication of the radio base station 10 can be stabilized.

  Further, for example, the output control unit 82 controls the output of the radio signal transmitted from the radio base stations 10 a and 10 b according to, for example, the movement state of the mobile unit 30. Specifically, the output control unit 82 controls the output of the wireless signal, for example, so that the radio wave intensity of the wireless signal transmitted in the moving direction of the mobile unit 30 becomes stronger. Further, for example, the output control unit 82 controls the output of the wireless signal such that the radio wave intensity of the wireless signal transmitted in the direction opposite to the moving direction of the moving body 30 becomes weaker.

  In the third embodiment, since the moving body 30 is a car of an elevator, the moving direction of the moving body 30 is up or down. The output control unit 82 controls the outputs of the radio base stations 10 a and 10 b so as to strengthen the radio signal in the upward direction and weaken the radio signal in the downward direction, for example, when the mobile unit 30 moves upward. Also, for example, the output control unit 82 controls the outputs of the wireless base stations 10 a and 10 b so as to intensify the downward radio signal and weaken the upward radio signal when the mobile unit 30 moves downward. .

  As described above, by controlling the output of the wireless signal, the radio wave intensity of the wireless signal transmitted in the moving direction of the moving body 30 becomes strong, and the signal is transmitted in the opposite direction to the moving direction of the moving body 30 The radio wave intensity of the radio signal becomes weak. Therefore, for example, when the mobile unit 30 of FIG. 5 moves upward, the wireless base station 10b installed above the mobile unit 30 can more easily communicate with the wireless communication devices 20d to 20f, and the wireless communication device 20a Communication with -20c is more difficult. On the other hand, in the example of FIG. 5, when viewed from the wireless base station 10a installed below the mobile unit 30, radio interference from other wireless devices is reduced when communicating with the wireless communication devices 20a to 20c. Communication with the communication devices 20a to 20c is facilitated.

  The method of changing the wireless signal output may be arbitrary. For example, when a plurality of antennas are used for the wireless base stations 10a and 10b, the power control unit 82 may reduce the number of antennas used for communication, or may select an antenna with a low gain. Good. Further, for example, the output control unit 82 may reduce the output power itself by weighting the wireless signal before outputting. Further, for example, the output control unit 82 may control the output of the wireless signal by beam forming.

  As described above, in the wireless communication system according to the third embodiment, the output control unit 82 of the control device 80 controls the output of the wireless signal in accordance with the movement state of the moving body 30. Thus, according to the wireless communication system of the third embodiment, as described above, the handover can be made smooth and the radio wave interference can be suppressed, so that the communication can be made more stable.

  Finally, an example of the hardware configuration of the main components of the wireless base station 10, the wireless communication device 20, and the control device 80 according to the first to third embodiments will be described.

[Example of hardware configuration]
FIG. 7 is a diagram showing an example of a hardware configuration of main parts of the radio base station 10, the radio communication apparatus 20, and the control apparatus 80 according to the first to third embodiments. The wireless base station 10, the wireless communication device 20, and the control device 80 each include a control device 201, a main storage device 202, an auxiliary storage device 203, a display device 204, an input device 205, and a communication device 206. The control device 201, the main storage device 202, the auxiliary storage device 203, the display device 204, the input device 205, and the communication device 206 are connected via a bus 210.

  Note that the display device 204 and the input device 205 may not be provided. When the display device 204 and the input device 205 are not provided, for example, by connecting a management terminal or the like, the states of the wireless base station 10, the wireless communication device 20, and the control device 80 are confirmed.

  The control device 201 executes the program read from the auxiliary storage device 203 to the main storage device 202. The control device 201 is, for example, one or more processors such as a CPU. The main storage device 202 is a memory such as a ROM (Read Only Memory) and a RAM (Random Access Memory). The auxiliary storage device 203 is a memory card, an HDD (Hard Disk Drive), or the like.

  The display device 204 displays the information. The display device 204 is, for example, a liquid crystal display. The input device 205 receives input of information. The input device 205 is, for example, a hardware key. Note that the display device 204 and the input device 205 may be a liquid crystal touch panel or the like that has both a display function and an input function. The communication device 206 communicates with other devices.

  Programs executed by the wireless base station 10, the wireless communication device 20, and the control device 80 are files in an installable format or an executable format, such as a CD-ROM, a memory card, a CD-R, and a DVD (Digital Versatile Disc). Etc.) and provided as a computer program product.

  Also, the program executed by the wireless base station 10, the wireless communication device 20 and the control device 80 may be stored on a computer connected to a network such as the Internet and provided by being downloaded via the network. Good. The programs executed by the wireless base station 10, the wireless communication device 20, and the control device 80 may be configured to be provided via a network such as the Internet without being downloaded.

  The program executed by the wireless base station 10, the wireless communication device 20, and the control device 80 may be configured to be provided by being incorporated in a ROM or the like in advance.

  The program executed by the wireless base station 10, the wireless communication device 20, and the control device 80 has a module configuration including functions that can be realized by the program among the functions of the wireless base station 10, the wireless communication device 20, and the control device 80. ing.

  The functions realized by the program are loaded into the main storage device 202 by the control device 201 reading out the program from the storage medium such as the auxiliary storage device 203 and executing the program. That is, the functions implemented by the program are generated on the main storage device 202.

  A part of the functions of the wireless base station 10, the wireless communication device 20, and the control device 80 may be realized by hardware such as an IC (Integrated Circuit). The IC is, for example, a processor that executes a dedicated process.

  When each function is realized using a plurality of processors, each processor may realize one of the functions or two or more of the functions.

  While certain embodiments of the present invention have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and the gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

DESCRIPTION OF SYMBOLS 10 radio | wireless base station 11 communication part 12 memory | storage part 20 radio | wireless communication apparatus 21 radio | wireless communication part 22 memory | storage control part 24 memory | storage part 24 wire communication part 30 mobile 40 machine room 50 motor 60 control panel 70 hall control panel 80 control device 81 determination part 82 output control unit 101 network identification information 102 received data 201 control device 202 main storage device 203 auxiliary storage device 204 display device 205 input device 206 communication device 210 bus

Claims (10)

A wireless communication system comprising: a control device; a plurality of wireless base stations mounted on a mobile body; and a plurality of wireless communication devices installed on a path of the mobile body,
The plurality of radio base stations periodically transmit beacon frames including the same network identification information,
Said controller, when said moving body is moving, the transmission frequency of a beacon frame transmitted from the plurality of radio base stations, higher than when the movable body is stopped,
The plurality of wireless communication devices receive the beacon frame,
Wireless communication system. The plurality of wireless base stations broadcast and transmit data frames including the same transmission target data and the same network identification information.
The wireless communication system according to claim 1. The wireless communication device discards the duplicate transmission target data when the received transmission target data is duplicated.
The wireless communication system according to claim 2. The control device makes the transmission frequency of the beacon frame lower when the mobile body is stopped than that when the mobile body is moving.
The wireless communication system according to claim 1. The control device controls the output of the wireless signal such that the radio wave intensity of the wireless signal transmitted in the moving direction of the mobile body becomes stronger.
The wireless communication system according to claim 1. The control device controls the output of the wireless signal such that the radio wave intensity of the wireless signal transmitted in the direction opposite to the moving direction of the mobile body becomes weaker.
The wireless communication system according to claim 1. The network identification information includes a MAC (Media Access Control) address.
The wireless communication system according to claim 1. There are multiple mobiles,
The plurality of wireless base stations mounted on the mobile periodically transmit a beacon frame including network identification information defined for each mobile.
The wireless communication system according to claim 1. The moving body is an elevator car,
The plurality of wireless base stations include a first wireless base station installed in the upper part of the car, and a second wireless base station installed in the lower part of the car.
The wireless communication system according to claim 1. A wireless communication method of a wireless communication system, comprising: a control device, a plurality of wireless base stations mounted on a mobile body, and a plurality of wireless communication devices installed on a path of the mobile body,
The plurality of wireless base stations periodically transmitting a beacon frame including the same network identification information;
A step wherein the controller, when the moving body is moving, be higher than when the transmission frequency of the beacon frame transmitted from the plurality of radio base stations, wherein the moving body is stopped,
The plurality of wireless communication devices receiving the beacon frame;
Wireless communication method including:

Images