JP2008219349A - Information transmitting method in avm system, avm device and avm system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information transmitting method in an AVM (Automatic Vehicle Monitoring) system capable of transmitting data of a data amount corresponding to a communicable transmission line when an AVM device to be installed in a command facility and a moving body performs communication by a plurality of transmission lines having respectively different transmission speeds, an AVM device and an AVM system. <P>SOLUTION: The information transmitting method includes the steps for: detecting communicable transmission lines among a plurality of transmission lines; selecting a transmission line to be used for communication among the detected communicable transmission lines; selecting one or a plurality of information types in accordance with a transmission speed of the selected transmission line to be used for communication to generate transmission information composed of the information on the selected type; and transmitting the generated transmission information through the transmission line to be used for communication. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an information transmission method, an AVM apparatus, and an AVM system in an AVM system, and more particularly to information transmission through a plurality of transmission lines.

  The conventional AVM system, for example, “the AVM slave station device 26 is equipped with a timer calibration function 31 that requests calibration time data from the AVM master station device 38 when the power is turned on to synchronize the time of the built-in timer 8. ACK A retry canceling function 34 for monitoring a signal and limiting useless retransmission processing; and a retry returning function 35 for restarting a retransmission stopped by the retry canceling function 34 when an ACK signal is received in a subsequent transmission. In addition, a retry interval adjustment function 36 for setting a retry interval using a random number is equipped ”(for example, see Patent Document 1).

JP 05-316011 A (summary)

  For example, an AVM system used for a fire emergency command facility is an AVM device (hereinafter also referred to as an “AVM slave station device”) installed (mounted on) a moving body such as a vehicle and a command facility such as a command stand of the fire department. An AVM device installed (hereinafter also referred to as “AVM master station device”), and the AVM master station device and the AVM slave station device communicate with each other via a transmission line to transmit information (hereinafter also referred to as “data”). ) Are transmitted to each other. The data transmission between the AVM master station apparatus and the AVM slave station apparatus is, for example, a plurality of transmission lines (transmission paths) having different transmission speeds and communication ranges, such as a wireless LAN, a portable packet public network, and a single wireless line. Is used.

  However, the conventional AVM system always transmits data of the same capacity regardless of the transmission line for transmission. For this reason, when transmitting a large amount of data, the occupation time during communication differs greatly depending on the transmission path used for transmission. For example, when transmitting 10 kbytes of data, the wireless LAN (11 Mbps) is about 0.0073 seconds, the mobile packet public network (9.6 Kbps) is about 8.3 seconds, and the single wireless line (1.2 Kbps) is It takes about 67 seconds.

  For example, when communication is performed using a single wireless line, the single wireless line uses voice communication and data transmission in common, so they are mutually exclusive, and sometimes during data transmission communication In addition to station voice communication, communication with AVM slave station devices mounted on other mobile units is also impossible. For this reason, when data with a large amount of data is transmitted, the occupied time of a single wireless line increases, and as a result, a voice call cannot be made, and the possibility of trouble in an emergency call increases.

  Further, when communication is performed using a portable packet public network, the amount of packet communication increases as the amount of data increases, increasing the packet communication fee and increasing the burden on the user.

  When communication is performed using a wireless LAN, the wireless LAN has a short transmission time because of its high transmission speed, but its communication range is narrow. For example, in an AVM system used in a fire emergency emergency facility, each station has Since communication is performed between the installed power saving access point and the mobile body, the communication distance and range are limited within and around the garage.

  As described above, the AVM system is an indispensable system, for example, in firefighting activities. When a single wireless line is used, consideration is given so as not to affect an emergency call. Therefore, consideration must be given to minimize the packet communication fee as much as possible.

  For this reason, when the AVM devices installed in the command facility and the mobile body communicate with each other through a plurality of transmission lines having different transmission speeds, it is possible to transmit data having a data amount corresponding to the communicable transmission line. An information transmission method, an AVM apparatus, and an AVM system in an AVM system that can be used have been desired.

  In the information transmission method in the AVM system according to the present invention, the AVM devices installed in the command facility and the mobile unit communicate with each other through a plurality of transmission lines having different transmission speeds, and transmit transmission information including a plurality of types of information. An information transmission method in a mutually transmitting AVM system, comprising: detecting a communicable transmission line among the plurality of transmission lines; and selecting a transmission line used for communication from the detected communicable transmission lines Selecting one or more types of information according to the transmission speed of the transmission line used for the selected communication, generating transmission information composed of the selected types of information, and the generated transmission information Is transmitted through a transmission line used for the communication.

  An AVM apparatus according to the present invention is an AVM apparatus that communicates with a transmission target AVM apparatus through a plurality of transmission lines having different transmission speeds and transmits transmission information including a plurality of types of information, Among the plurality of transmission lines, a line detection means for detecting a communicable transmission line, a selection means for selecting a transmission line used for communication among the detected communicable transmission lines, and a selected communication. Depending on the transmission speed of the transmission line, one or more types of information are selected, transmission information generating means for generating transmission information composed of the selected information of the type, and transmission information generated by the transmission information generating means And transmission means for transmitting via a transmission line used for the communication.

  In the AVM system according to the present invention, the AVM device is installed in each of a command facility and a moving body.

  The present invention detects a transmission line that can be communicated from a plurality of transmission lines, selects a transmission line to be used for communication, and uses transmission information generated according to the transmission speed of the transmission line to be used for communication to be used for communication. By performing transmission through a line, data can be transmitted in accordance with a communicable transmission line when communication is performed via a plurality of transmission lines having different transmission rates.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram of an AVM system according to the first embodiment. In the figure, an AVM system in the present embodiment is used in, for example, a fire emergency command communication facility, and an AVM slave station device 100 that is an AVM device installed in a moving body 10 such as a vehicle (emergency vehicle such as a fire engine). And an AVM master station device 200 that is an AVM device installed in the firefighting headquarters 20 that is a command facility, and the AVM master station device 200 and the AVM slave station device 100 communicate with each other via a transmission line (described later). This is a system that transmits information (hereinafter also referred to as “data”) to each other and automatically displays the dynamic management information of the mobile unit 10 on the command board equipment 210 connected to the AVM master station apparatus 200.

  Data transmission between the AVM master station apparatus 200 and the AVM slave station apparatus 100 is performed by a plurality of transmission lines (transmission paths) having different transmission speeds and communication ranges by a wireless LAN, a portable packet public network, and a single wireless line. It is done using.

  A transmission line based on a single wireless line is installed in the firefighting headquarters 20 and connected to the AVM master station apparatus 200. The wireless apparatus 220 is connected to the mobile object 10 and connected to the AVM slave station apparatus 100. Is done. Data communication using this single wireless line is capable of wide-range communication and has a transmission capacity as low as 1.2 Kbps, but is self-employed and does not incur communication costs. For example, when transmitting data of 10 kbytes, it takes about 67 seconds.

  A transmission line using a wireless LAN is established by a wireless LAN 230 that is installed at each station and connected to the AVM master station device 200 and a wireless LAN 130 that is installed on the mobile unit 10 and connected to the AVM slave station device 100. Is called. In data communication using this wireless LAN, the communicable area is limited to the vicinity of the station, but large capacity transmission is possible with a transmission capacity of 11 Mbps, and there is no communication cost. For example, when data transmission of 10 kbytes is performed, it takes about 0.0073 seconds.

  A transmission line using a portable packet public network is installed in the mobile 10 via the portable base 241 by the portable center 240 connected to the AVM master station device 200 and is connected to the AVM slave station device 100. With the machine 140. Data communication using this portable packet public network is capable of wide-range communication, and is capable of medium-capacity transmission with a transmission capacity of 9.6 Kbps. However, the connection procedure is long, and communication costs corresponding to the transmission capacity are required. . For example, when transmitting data of 10 kbytes, it takes about 8.3 seconds.

  FIG. 2 is a configuration diagram of the AVM apparatus according to the first embodiment. In the figure, an AVM slave station device 100 and an AVM master station device 200, which are AVM devices, include a communication processing unit 30 connected to a plurality of transmission lines, a CPU 40 for operation control, and various types of devices connected to the CPU 40. It comprises an operation unit 50 for performing data input / output operations and a display unit 60 for displaying various information.

  The communication processing unit 30 uses the transmission information (data) generated by the transmission information generation unit 42 by the line detection unit 31 that detects a communicable transmission line among a plurality of transmission lines and the operation described later for communication. The CPU 40 has a transmission means 32 for transmission via a transmission line, and the CPU 40 selects a transmission line used for communication among the communicable transmission lines detected by the line detection means 31, and the selection means. Transmission information generating means 42 for selecting one or more types of information (described later) according to the transmission speed of the transmission line used for the communication selected by 41, and generating transmission information composed of the selected information of the type; have.

  The line detection unit 31, the transmission unit 32, the selection unit 41, and the transmission information generation unit 42 can be configured by hardware such as a circuit device, or software executed by an arithmetic unit such as a CPU or a microcomputer. It can also be configured as. When implemented as software, programs that realize the functions of these units are stored in ROM (Read Only Memory), HDD (Hard Disk Drive), etc., and an arithmetic device such as a CPU or microcomputer reads the program, It can be configured by executing processing corresponding to the function of each unit in accordance with the instructions of the program.

  With such a configuration, communication between the AVM slave station device 100 and the AVM master station device 200 performs data transmission using the above-described wireless LAN, portable packet public network, or single wireless line, and includes command information, Support information, dynamic registration information, data update information in the AVM slave station device 100, and the like are mutually transmitted between the AVM master station device 200 and the AVM slave station device 100. Further, the AVM system transmits a command sentence (case) sent from the command board facility 210 to the AVM slave station device 100 via the AVM master station device 200 using a plurality of transmission lines.

  The data transmitted between the AVM slave station device 100 and the AVM master station device 200 described above includes, as information types, command information, vehicle information, hospital information, water use information, map information, vehicle route search information, and weather information. , Notification information, municipal code, and other ladder information. When a command is issued from the command stand equipment 210, a command is applied to the moving body 10 such as a vehicle in a garage and a vehicle running in a fire department with the above data, and the AVM master station device 200 and the AVM slave station device 100 Select one or more types of information according to the transmission speed of the transmission line used for communication with the network, and limit the amount of data to be transmitted by generating and transmitting data composed of the selected types of information . Next, the structure of data transmitted according to such a transmission line will be described with reference to FIG.

  FIG. 3 is a diagram showing a data structure of transmission data in the first embodiment. Hereinafter, the structure of data to be transmitted according to the transmission line will be described with reference to FIGS.

(A) Data size All types of information sent from the command board equipment 210 are selected and transmitted using a wireless LAN transmission line. As shown in FIG. 3 (a), the contents of this data are from command information, vehicle information, hospital information, irrigation information, map information, vehicle route search information, weather information, report information, municipal code, other ladder information, etc. Composed.

(B) In the data Among the types of information sent from the command board equipment 210, the packet communication fee is suppressed and the type of information necessary for dispatch is selected and transmitted using the transmission line by the portable packet public network. The As shown in FIG. 3B, the content of this data is composed of command information, vehicle information, hospital information, water use information, weather information, and municipal codes.
Note that map information, vehicle route search information, notification information, other ladder information, and the like are transmitted to the AVM master station device 200 by the operation of the AVM slave station device 100 when necessary in the mobile unit 10 to exchange the data. It is possible.

(C) Small data Of the types of information transmitted from the command board equipment 210, only the type of information with high importance is selected and transmitted using a transmission line of a single wireless line. As shown in FIG. 3C, the content of this data is composed of command information, vehicle information, and a municipal code. Other types of information are not transmitted over a single wireless line.
In this way, as a line having a small transmission capacity is used, information of types with low importance is limited, and only information of types with high importance such as command statements is selected for transmission.

  Next, communication is possible when the AVM slave station device 100 installed in the mobile unit 10 and the AVM master station device 200 installed in the firefighting headquarters 20 communicate with each other through the transmission lines having different transmission speeds. The operation of the first embodiment for transmitting data of a data amount corresponding to the transmission line will be described separately for the AVM slave station device 100 and the AVM master station device 200.

  FIG. 4 is a flowchart showing a transmission operation of the AVM slave station apparatus in the first embodiment. When the mobile unit 10 transmits data to the firefighting headquarters 20, that is, in the data transmission operation from the AVM slave station device 100 to the AVM master station device 200, the transmission speed is the fastest among the communicable transmission lines. Data transmission is performed by selecting the transmission line as a transmission line used for communication. Such a transmission operation will be described based on FIG. 4 with reference to FIG.

(S101) First, the line detection means 31 of the AVM slave station apparatus 100 detects a communicable transmission line among a single wireless line, a wireless LAN, and a portable packet public network.
(S102) Next, the selection unit 41 determines whether or not the wireless LAN is connected based on the communicable transmission line detected by the line detection unit 31.
(S103) When it is determined in step S102 that the wireless LAN is connected, the selection unit 41 selects the wireless LAN as a transmission line used for communication, and the transmission information generation unit 42 selects the above-described (a) data Transmission information (data) composed of all types of information shown in FIG. 3A described above is generated, and the data is transmitted by the transmission means 32 using the wireless LAN 130.
(S104) On the other hand, if it is determined in step S102 that the wireless LAN is not connected, the selection means 41 is connected to the portable packet public network based on the communicable transmission line detected by the line detection means 31. Determine whether or not.
(S105) When it is determined in step S104 that the portable packet public network is connected, the selection means 41 selects the portable packet public network as a transmission line used for communication, and the transmission information generation means 42 (B) The transmission information (data) composed of the information of the type shown in FIG. 3B described in the data is generated, and the transmission means 32 transmits the data using the portable packet communication device 140.
(S106) On the other hand, if it is determined in step S104 that the wireless LAN is not connected, the selecting means 41 is connected to a single wireless line based on the communicable transmission line detected by the line detecting means 31. Determine whether or not.
(S107) When it is determined in step S106 that a single wireless line is connected, the selection unit 41 selects the single wireless line as a transmission line used for communication, and the transmission information generation unit 42 (C) Transmission information (data) composed of the information of the type shown in FIG. 3C described in the small data section is generated, and the data is transmitted by the transmission unit 32 using the wireless device 120.
(S108) On the other hand, if it is determined in step S106 that a single wireless line is not connected, the selection unit 41 determines that all the lines are not connected, and the transmission information generation unit 42 c) Transmission information (data) composed of the information of the type shown in FIG. 3C described in the small data section is generated, and the transmission means 32 retransmits the data using the wireless device 120 through a single wireless line.
(S109) This retransmission is repeated until a communication state is detected by the line detecting means 31 or until a predetermined number of retransmissions are performed.

  FIG. 5 is a flowchart showing the transmission operation of the AVM master station apparatus in the first embodiment. When the fire department headquarters 20 transmits data to the mobile unit 10, that is, in the data transmission operation from the AVM master station device 200 to the AVM slave station device 100, there are a plurality of mobile units 10 and where they exist in the pipe. Since it is unclear whether all of the detected transmission lines that can be communicated are selected as transmission lines used for communication, data transmission is performed. Such a transmission operation will be described based on FIG. 5 with reference to FIG.

(S201) First, the line detection means 31 of the AVM master station apparatus 200 detects a communicable transmission line among a single wireless line, a wireless LAN, and a portable packet public network.
(S202) Next, the selection unit 41 determines whether a wireless LAN is connected based on the communicable transmission line detected by the line detection unit 31.
(S203) When it is determined in step S202 that the wireless LAN is connected, the selection unit 41 selects the wireless LAN as a transmission line used for communication, and the transmission information generation unit 42 selects the above-described (a) data Transmission information (data) composed of all types of information shown in FIG. 3A described above is generated, and the data is transmitted by the transmission means 32 using the wireless LAN 130.
(S204) On the other hand, if it is determined in step S202 that the wireless LAN is not connected, or after data transmission by the wireless LAN is performed in step S203, the selection unit 41 performs communication detected by the line detection unit 31. It is determined whether or not a portable packet public network is connected based on a possible transmission line.
(S205) When it is determined in step S204 that the portable packet public network is connected, the selection means 41 selects the portable packet public network as a transmission line used for communication, and the transmission information generation means 42 (B) The transmission information (data) composed of the information of the type shown in FIG. 3B described in the data is generated, and the transmission means 32 transmits the data using the portable packet communication device 140.
(S206) On the other hand, if it is determined in step S204 that the wireless LAN is not connected, or after data transmission is performed by the portable packet public network in step S205, the selection means 41 is detected by the line detection means 31. Whether or not a single wireless line is connected is determined based on the communicable transmission line. If the single wireless line is not connected, the transmission process is terminated.
(S207) If it is determined in step S206 that a single wireless line is connected, the selection unit 41 selects the single wireless line as a transmission line used for communication, and the transmission information generation unit 42 (C) Transmission information (data) composed of the information of the type shown in FIG. 3 (c) described in the small data is generated, and the transmission means 32 transmits the data using the wireless device 120 to perform transmission processing. finish.

  As described above, in the present embodiment, a communicable transmission line is detected from among a plurality of transmission lines, and one or more information types are selected according to the transmission speed of the transmission line used for communication, By transmitting transmission information composed of the selected information of the type through the transmission line, the AVM master station device 200 installed in the firefighting headquarters 20 and the AVM slave station device 100 installed in the mobile body 10 transmit When communication is performed using a plurality of transmission lines having different speeds, data of a data amount corresponding to a communication line capable of communication can be transmitted.

  Further, since the AVM slave station apparatus 100 can detect a communicable line among the respective transmission lines and can automatically select and use the most efficient line at that time, the line cost can be reduced. Further, by limiting the data transmission amount according to the transmission line capacity of the selected line and transmitting the necessary minimum amount corresponding to the line, it is possible to reduce the traffic in the data transmission and to reduce the probability of transmission to the AVM slave station device 100. Improvements can be made.

  In addition, when data is transmitted using a single wireless line with a small transmission capacity, the amount of data with low importance is limited, and only information with high importance such as command statements is selected for transmission. The occupied time of the wireless line is reduced, the influence on the wireless voice communication can be reduced, and the possibility of trouble in an emergency call is reduced.

  Further, when communication is performed using a portable packet public network, by restricting information with a large amount of data, the amount of packet communication can be reduced, and the burden of packet communication charges on the user can be reduced.

  Further, since the AVM slave station apparatus 100 detects a communicable line among the respective transmission lines and transmits data through the communicable transmission line at that time, data communication unestablishment can be reduced.

  Further, when data (command information, etc.) is transmitted from the AVM master station device 200 side, even if there are a plurality of moving bodies 10 and where they are in the pipe is unknown, they are all transmitted to a transmission line capable of communication. In addition, by transmitting data having a data amount corresponding to the transmission capacity of the line, it is possible to increase the probability of data transmission to the mobile unit 10 without applying a load on each line.

  In the present embodiment, the transmission operation of the AVM slave station device 100 is performed when data transmission is performed by selecting a transmission line with the fastest transmission speed as a transmission line used for communication among communication lines that can be communicated. However, the present invention is not limited to this, and data transmission may be performed by selecting all the detected transmission lines that can be communicated as transmission lines used for communication. That is, an operation similar to the transmission operation (FIG. 5) of the AVM master station device 200 described above may be performed.

  Further, in the present embodiment, the transmission operation of the AVM slave station apparatus 200 has been described for the case where data transmission is performed by selecting all the detected communication transmission lines as transmission lines used for communication. The present invention is not limited to this, and data transmission may be performed by selecting a transmission line with the fastest transmission speed among transmission lines that can be communicated as a transmission line used for communication. That is, an operation similar to the transmission operation (FIG. 4) of the AVM master station device 100 described above may be performed.

1 is a configuration diagram of an AVM system in Embodiment 1. FIG. 1 is a configuration diagram of an AVM apparatus in Embodiment 1. FIG. 3 is a diagram showing a data structure of transmission data in Embodiment 1. FIG. 6 is a flowchart showing a transmission operation of the AVM slave station apparatus in the first embodiment. 3 is a flowchart showing a transmission operation of the AVM master station apparatus in the first embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Mobile body, 20 Fire department headquarters, 30 Communication processing part, 31 Line detection means, 32 Transmission means, 41 Selection means, 42 Transmission information generation means, 50 Operation part, 60 Display part, 100 AVM slave station apparatus, 120 Radio | wireless machine, 130 wireless LAN, 140 mobile packet communication device, 200 AVM master station device, 210 command base equipment, 220 wireless device, 230 wireless LAN, 240 mobile center, 241 mobile base.

Claims (5)

This is an information transmission method in an AVM system in which AVM devices installed in a command facility and a mobile unit communicate with each other through a plurality of transmission lines having different transmission speeds and transmit transmission information composed of a plurality of types of information to each other. And
Detecting a communicable transmission line among the plurality of transmission lines;
A step of selecting a transmission line to be used for communication among the detected transmission lines capable of communication;
Selecting one or more types of information according to the transmission speed of the transmission line used for the selected communication, and generating transmission information consisting of the selected information of the type;
And transmitting the generated transmission information through a transmission line used for the communication. An AVM device that communicates with a transmission target AVM device through a plurality of transmission lines having different transmission speeds and transmits transmission information including a plurality of types of information,
Line detecting means for detecting a communicable transmission line among the plurality of transmission lines;
A selection means for selecting a transmission line used for communication among the detected transmission lines capable of communication;
Transmission information generating means for selecting one or more types of information according to the transmission speed of the transmission line used for the selected communication, and generating transmission information composed of the selected types of information;
An AVM apparatus comprising: transmission means for transmitting transmission information generated by the transmission information generating means through a transmission line used for the communication. The selection means includes
3. The AVM apparatus according to claim 2, wherein a transmission line with the fastest transmission speed is selected as a transmission line used for communication among the detected transmission lines that can be communicated. The selection means includes
Select all the detected transmission lines that can be used as transmission lines for communication,
The transmission means includes
3. The AVM apparatus according to claim 2, wherein the transmission information generated according to a transmission rate is transmitted through a transmission line corresponding to the transmission information.   An AVM system, wherein the AVM device according to any one of claims 2 to 4 is installed in each of a command facility and a mobile body.

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