JP6519977B2 - Wireless system and communication channel setting method - Google Patents

Description

  The present invention relates to a wireless system and a communication channel setting method.

  In wireless systems such as firefighting and emergency radio systems, there are two modes: a regular transmission mode in which radio waves are constantly transmitted from the base station to the mobile radio equipment, and an emergency transmission mode in which radio waves are transmitted only when the base station communicates with the mobile radio equipment. It is used.

  In the regular transmission mode, the mobile radio apparatus located in the communication area of the base station can always receive radio waves from the base station, so the mobile radio apparatus automatically switches the communication channel to the channel of the radio wave received. It is possible to

  However, in the case of the emergency transmission mode, the mobile radio apparatus can not receive radio waves from the base station, and can not automatically switch the communication channel. Therefore, the fire brigade and the paramedics (hereinafter referred to as members) judge the communication channel based on the current position, experience, etc., and manually switch the channel.

  On the other hand, in Japanese Patent Application Laid-Open No. 2011-244150, a mobile radio apparatus is disclosed which scans an available channel by a synchronous burst signal. According to this configuration, manual channel setting operation by members is not required, and convenience and operability can be remarkably improved.

JP 2011-244150 A

  However, in the configuration according to Japanese Patent Application Laid-Open No. 2011-244150, there is a problem that the radio band is temporarily occupied by the synchronous burst signal output to acquire available channel information, and other communication is interrupted. there were.

  Therefore, the main object of the present invention is to provide a wireless system and a communication channel setting method capable of automatically setting a communication channel in the emergency transmission mode without outputting a synchronous burst signal.

  In order to solve the above problems, the invention relating to a wireless system in which the command side system and the on-site side system communicate via a base station is a position acquisition means in which an on-vehicle terminal acquires current position and outputs position information Map information storage means which is divided into a plurality of meshes, and stores map information to which each mesh is assigned an assigned mesh number characterizing an area of the mesh and a channel communicable in the area of the mesh; A map information processing unit that calculates a mesh number corresponding to position information as a calculation mesh number, and a channel selection table in which a plurality of communicable channels are stored in priority order corresponding to the assigned mesh number, calculation mesh The assigned mesh number corresponding to the number is retrieved from the channel selection table, and a channel with high priority is selected as the communication channel. Characterized in that it comprises a channel selection means for outputting as the channel setting information.

  The invention according to the communication channel setting method in a wireless system in which the command-side system and the site-side system communicate via a base station includes a position acquisition step of acquiring current position and outputting position information, and a plurality of meshes And map information storing step for storing map information to which each mesh is assigned an assigned mesh number characterizing an area of the mesh and a channel communicable in the area of the mesh, and position information A map information processing step of calculating a mesh number to be calculated as a calculation mesh number, and an allocated mesh number corresponding to the calculated mesh number from a channel selection table in which a plurality of communicable channels are stored in priority order corresponding to the allocated mesh number. Search, select a channel with high priority as the communication channel, and A channel selection step of outputting Te characterized in that it comprises a.

  According to the present invention, it is possible to automatically set the communication channel in the emergency transfer mode without outputting a synchronization burst signal.

1 is a block diagram of a wireless system according to the present invention. It is a block diagram of a field side system part. It is the figure which illustrated the channel information which shows the correspondence of a base station and a channel number. It is the figure which illustrated the channel selection table. It is a flowchart which shows a channel setting procedure. It is the figure which illustrated the map information stored in the map information storage part about the conditions at the time of performing channel setting.

  An embodiment of the present invention will be described. FIG. 1 is a block diagram of a wireless system 2 according to the present invention. It should be noted in advance that this wireless system 2 can be applied not only to a wireless system such as a firefighting or an emergency but also to a wireless system such as a police wireless system.

  The wireless system 2 comprises a command side system unit 10 and a site side system unit 20. The command side system unit 10 is a system provided with a command control device 11, a management monitoring device 12, a line control device 13, a network 14, and a base station 15, and installed on the command headquarters side. The on-site system unit 20 includes a mobile wireless device 21 and an on-vehicle terminal 22, and is a system on the side of a vehicle moving to the site or in the field. Although only one base station 15 and one site-side system unit 20 are illustrated in FIG. 1, a plurality of base stations may be provided.

  The command control device 11 is a device for communicating between a commander on the command side system unit 10 side and a member such as a fireman or a rescue worker via the on-vehicle terminal 22 or the like.

  The management and monitoring device 12 is a device for managing and monitoring communication in the wireless system 2. The line control device 13 performs line control such as through which base station 15 communication is performed.

  The base station 15 communicates with the mobile radio device 21 by transmitting and receiving radio waves of the frequency set in the regular transmission mode and the emergency transmission mode.

  FIG. 2 is a block diagram of the on-site system unit 20. As shown in FIG. The mobile radio device 21 is a device mounted on an emergency vehicle or the like, and includes a transmission / reception unit 21a for communicating with the base station 15 or the on-vehicle terminal 22, and a channel setting unit 21b for setting a channel for transmission / reception with the base station 15. .

  Channel information K as shown in FIG. 3 is stored in the channel setting unit 21b. FIG. 3 shows channel information K held by the mobile radio apparatus 21. The channel information K is composed of an uplink frequency K2 and a downlink frequency K3 corresponding to each channel number K1. The base station 15 can transmit radio waves on at least one or more channels. Therefore, the mobile radio apparatus 21 can communicate by switching to the channel shown in FIG. 3 within the communication area of each base station.

  As shown in FIG. 2, the on-vehicle terminal 22 includes an input / output unit 22a, a map information processing unit 22b, a position acquisition unit 22c, a map information storage unit 22d, and a channel selection unit 22e.

  The input / output unit 22a has an interface function for communicating with the transmission / reception unit 21a, a voice input / output function for enabling conversation, a display function for displaying map information and various information by a liquid crystal device, etc. It has an information input function to input various information using a keyboard, a touch panel or the like. However, in the process of setting the communication channel as described later, it is added that only the interface function is essential and the other functions are optional.

  The map information processing unit 22 b has, for example, a navigation function and a channel information acquisition function. The navigation function is a function for guiding an emergency vehicle to the site or the like. Although the details of the channel information acquisition function will be described later, it is a function to acquire information on a communication channel for performing communication in the emergency transfer mode at a place where the on-vehicle terminal 22 is located.

  The position acquisition unit 22c acquires its current position (the current position of the on-vehicle terminal 22) using a GPS (Global Positioning System). The acquired position information is sent to the map information processing unit 22 b and used for the navigation function and the channel information acquisition function.

  The map information storage unit 22 d stores map information including map data and channel information. The map information is divided into meshes (not limited to rectangular areas). Each mesh is given a mesh-specific number (mesh number). That is, when the position acquisition unit 22c acquires the current position of the on-vehicle terminal 22 (for example, [North latitude: 35 degrees 54 minutes 15 seconds, East longitude: 139 degrees 55 minutes 30 seconds]), the map information processing unit 22b is acquired A mesh number (for example, half area mesh number [533967-84-3]) is calculated based on the current position. In addition, calculation of a mesh number is not limited to a division area mesh, According to the installation density and output of base station 15, you may use a standard area mesh.

  A channel selection table Q as shown in FIG. 4 is stored in advance in the channel selection unit 22e. Then, the channel selection unit 22e searches the channel selection table Q using the mesh number calculated by the map information storage unit 22d, and selects a communication channel in the emergency transfer mode.

  The channel selection table Q shown in FIG. 4 is composed of a mesh number field Q1 and an available channel number field Q2 including channel numbers whose weights correspond to priorities in correspondence with the mesh number field Q1. For example, in the mesh of mesh number Q1 "633967-84-3", it is shown that the channel numbers are "1", "2", "3" and "4" in order of priority. Even if the base station 15 can communicate by, for example, four communication channels, it is not selected as a communication channel as "invalid" if the received electric field strength at the current position of the on-vehicle terminal 22 can not be used for communication. It is supposed to be.

  Here, the priority can be, for example, various communication parameters such as received electric field strength. For example, when the priority is set based on the received electric field strength, radio wave propagation investigation is performed in advance, and a high priority is set for a channel having a high received electric field strength obtained as a result.

  Also, for example, if the channel selection unit 22e is provided with a use frequency table indicating the correspondence between the mesh number and the use frequency of the channel, the use frequency is made to correspond to the priority (the higher the use frequency, the higher the priority). It is also possible. In this case, it is needless to say that the usage frequency table is history-updated each time it is used.

  Next, channel setting processing in the wireless system 2 will be described. FIG. 5 is a flowchart showing a channel setting procedure, and FIG. 6 is a view exemplifying map information stored in the map information storage unit 22d under various conditions for performing channel setting. In FIG. 6, each mesh is shown by a dashed dotted line. At this time, a mesh number (for example, 633967-84-3) is illustrated and described in several meshes, and the on-site side system unit 20 is located in the area of the mesh number of "6333967-84-4" I assume. The symbols R (Ra to Rd) indicate communication areas of the four base stations 15 (15a to 15d).

  Step S1: First, when the on-site side system unit 20 is moving to the site or arriving at the site and performs communication in the emergency transfer mode, the position acquisition unit 22c of the on-vehicle terminal 22 uses its own GPS function Get the current position.

  Step S2: The acquired current position is sent to the map information processing unit 22b as position information. The map information processing unit 22b calculates the mesh number from the position information, and outputs the mesh number to the channel selection unit 22e.

  Steps S3 and S4: The channel selection unit 22e receives the mesh number from the map information processing unit 22b, and inquires the mobile radio device 21 of the current channel number set in the mobile radio device 21 and acquires the channel number.

  Step S5: When the currently set channel number is acquired, the channel selection unit 22e refers to the channel selection table Q shown in FIG. 4 to determine whether or not channel change is necessary.

  In the channel selection table Q, available channel numbers are registered in the order of priority corresponding to the mesh numbers. Then, for example, when the currently set channel number is “2” and the mesh number is “6333967-84-3”, the channel number of “2” is the priority channel 2 with the available channel number. It is determined that channel change is unnecessary.

  On the other hand, when the currently set channel number is "5" and the mesh number is "633967-84-3", the channel number of "5" is not included in the available channel number column Q2. Therefore, the channel selection unit 22e determines that a channel change is necessary.

  Step S6: When it is determined that the channel change is necessary, the channel selection unit 22e selects the channel number having the highest priority from the available channel numbers corresponding to the acquired mesh number. For example, if the currently set channel number is “5” and the mesh number is “6333967-84-3”, the channel number with the highest priority is “1”. Then, the channel selection unit 22e selects to change to the channel number "1".

  Steps S7 and S8: The channel selection unit 22e outputs the selected channel number as channel change information to the channel setting unit 21b via the input / output unit 22a. The channel selection unit 22e sets (changes) the channel of the transmission / reception unit 21a based on the channel information.

  As described above, since the channel setting at the time of communication in the emergency transfer mode is automatically set, it is possible to quickly respond to an emergency or the like while reducing the load on the crew. Further, when the communication channel is changed, the selection is made on the basis of the priority corresponding to the received electric field strength, the usage frequency and the like, so that high quality communication can be performed.

Reference Signs List 2 wireless system 10 command side system unit 11 command control device 12 management monitoring device 13 line control device 14 network 15 base station 20 field side system unit 21 mobile wireless device 21a transmitter and receiver unit 21b channel setting unit 22 car terminal 22a input / output unit 22b map Information processing unit 22c Position acquisition unit 22d Map information storage unit 22e Channel selection unit

Claims (10)

A wireless system in which a command side system and a field side system communicate via a base station operating in an emergency transmission mode ,
The on-site system includes a mobile radio and an on-board terminal in communication with the mobile radio;
The in-vehicle terminal is
Position acquisition means for acquiring current position and outputting position information;
Map information storage means for storing map information which is divided into a plurality of meshes, and in which each mesh is provided with an assigned mesh number characterizing an area of the mesh and a channel communicable in the area of the mesh;
Map information processing means for calculating a mesh number corresponding to the position information as a calculated mesh number;
A channel selection table in which a plurality of communicable channels are stored in priority order corresponding to the allocated mesh number is provided, and the allocated mesh number corresponding to the calculated mesh number is searched from the channel selection table, A channel selection unit that selects the channel with high priority as the communication channel and outputs the selected channel as channel setting information;
A wireless system comprising: The wireless system according to claim 1, wherein
The mobile radio device
Transmission / reception means for transmitting / receiving radio waves;
Channel setting means for setting a channel in the transmission / reception means to a channel selected by the channel selection means;
A wireless system comprising: The wireless system according to claim 2 , wherein
When outputting the channel setting information, the channel selection means inquires of the channel currently set to the transmission / reception means, and determines whether the currently set channel is the same as the selected channel or not. A wireless system characterized by outputting the channel setting information in the case. The wireless system according to any one of claims 1 to 3, wherein
The wireless system according to claim 1, wherein the priority is a received electric field strength of the on-site system in a region of the mesh currently located on the on-site system. The wireless system according to any one of claims 1 to 3, wherein
The wireless system, wherein the priority is a frequency of use of a channel used by the on-site system in a region of the mesh currently located on the on-site system. A communication channel setting method in a wireless system in which a command side system and a field side system communicate via a base station operating in an emergency transmission mode ,
A position acquisition step of acquiring the current position and outputting position information;
A map information storage step of storing map information which is divided into a plurality of meshes, and in which each mesh is provided with an assigned mesh number characterizing the area of the mesh and a channel communicable in the area of the mesh;
A map information processing step of calculating a mesh number corresponding to the position information as a calculated mesh number;
The allocated mesh number corresponding to the calculated mesh number is retrieved from a channel selection table in which a plurality of communicable channels are stored in order of priority corresponding to the allocated mesh number, and the channel with the high priority is communicated. A channel selection step of selecting as a channel and outputting it as channel setting information;
A communication channel setting method comprising:

The communication channel setting method according to claim 6, wherein
A transmitting / receiving step of transmitting / receiving radio waves;
A channel setting step of setting a channel in the transmission / reception step to a channel selected by the channel selection step;
A communication channel setting method comprising: The communication channel setting method according to claim 7 , wherein
In the channel selection step, when the channel setting information is output, the channel currently set in the transmission / reception step is inquired to determine whether the currently set channel is the same as the selected channel or not. A communication channel setting method comprising: outputting the channel setting information when different.

The communication channel setting method according to any one of claims 6 to 8, wherein
The communication channel setting method, wherein the priority is a received electric field strength of the site side system in a region of the mesh currently located in the site side system. The communication channel setting method according to any one of claims 6 to 8, wherein
The communication channel setting method, wherein the priority is a frequency of use of a channel used by the on-site system in the area of the mesh currently located on the on-site system.

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