JP2001069095A - Digital disaster prevention radio system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To build up an economical system and to enhance the communication function by surely propagating control information between a center device and a terminal and changing a transmission rate or the like so as to allow a plurality of users to use the system in common through the use of few channels. SOLUTION: The digital disaster prevention radio system consists of a center device 101 controlling communication of a regional disaster prevention radio system and a plurality of terminals 102-107, where a digital wireless signal is sent and received. In this case, communication channels each consisting of a combination of a frequency and a time slot are divided into channel groups, classified into individual user channels, common use channels and specific user channels with high priority, and the channel is assigned in matching with a condition of traffic and a configuration. Furthermore, a communication signal is classified into control information and inter-communication information to attain inter-communication, a voice compression/expansion system is selected depending on traffic state, the communication slot is variably assigned to each of the terminals 102-107 by using the communication traffic for a parameter so as to improve the efficiency of transmission of high speed/low speed data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system of a disaster prevention wireless system for realizing communication of disaster-related information and the like between an administrative agency or the like and a disaster-related organization or a living-related organization in a disaster or the like. is there.

[0002]

2. Description of the Related Art Conventionally, a local disaster prevention radio system is used in a disaster or the like when a wired public communication network is destroyed or when it becomes difficult to use it due to concentrated calls, such as a municipal government office and fire police. It is a system that connects to hospitals, electric power companies, and other living related organizations. Further, the conventional system is an analog system, and there are few available communication channels due to frequency allocation, so that the number of lines is small and it is difficult to cope with an increase in traffic. Further, it is usually used in simplex communication, and when performing duplex communication by frequency compression or the like, the mode of the duplex / simplex communication is manually switched. Furthermore, since switching between low-speed use and high-speed use cannot be performed, communication is normally performed in accordance with the high-speed mode.

[0003]

As described above, the conventional wireless communication system for disaster prevention has a fixed configuration for use. For this reason, even if an attempt is made to effectively use these facilities in the event of a disaster, there are problems such as the inability to cope with the advancement of use, which is indispensable in an emergency due to the frequency allocation relationship and the unidirectional transmission path. .

Further, operability is required to be improved in a disaster or the like. However, if the number of wireless channels is increased in order to realize the duplex communication, a system that requires a plurality of wireless transceivers is required. It is necessary to increase the cost, which also increases the cost of the entire disaster prevention wireless system.

Further, in the conventional loudspeaker system, if a high sound quality is required and the line utilization efficiency is increased, it is necessary to adopt a compression / expansion method having a high compression degree for voice communication, and the music in normal use is required. Cannot be transmitted / reproduced, so that it is inconvenient because it is not suitable for practical use.

[0006] The present invention has been made in view of such circumstances, and an object of the present invention is to enable effective communication in accordance with situations during disasters and non-disasters, and to increase the number of communication channels. It is an object of the present invention to provide a disaster prevention wireless system capable of improving usability, economic efficiency, and realizing future image transmission and high-quality voice communication.

[0007]

SUMMARY OF THE INVENTION In order to overcome the above-mentioned problems, the present invention realizes high-speed communication by digitalization, performs variable allocation of time slots, realizes more lines, The purpose of the present invention is to use the communication medium by changing the line assignment and the use of the time slot between time and disaster. As described above, a practical system with a high degree of use can be constructed by the digitized disaster prevention wireless communication system, and the wireless system can be advanced.
Therefore, since the frequency which can be used in the system was limited because the analog system was conventionally used, bidirectional communication could not be realized. However, according to the present invention, an available line within the same number of wireless channels is set. Increase, and furthermore, efficiently allocate variable communication slots according to traffic, make effective use of wireless channels, and realize a highly convenient disaster prevention system, realizing a more effective system with a small investment. Can be achieved.

That is, the present invention is a digital disaster prevention radio system in which a center device for performing channel allocation control of a disaster prevention radio system and a plurality of terminal devices which communicate with each other via a designated line are connected by a communication path. The communication between the center device and the terminal device is digitized, and the communication path is constituted by a plurality of mutual communication channels disclosed to the terminal device and control information channels not disclosed to the terminal device. The control information channel specifies the speed of voice coding, the number of channels used for communication, and the direction of the caller and the receiver for the communication path, and realizes duplex communication. It is a digital disaster prevention wireless system that is a feature.

Therefore, according to the present invention, a center device for performing line allocation control of a disaster prevention wireless system and a plurality of terminal devices for communicating with each other on a designated line are provided. The communication path is configured by a control information channel and a plurality of intercommunication channels, and the control information channel can specify the speed of voice coding, the number of channels used for communication, and the directionality.

[0010] The present invention is also a digital disaster prevention radio system comprising a center device for performing line allocation control of the disaster prevention radio system and a plurality of terminal devices for performing mutual communication on designated lines. Digitization is performed by the disaster prevention wireless system, a plurality of communication slots are configured by combining a frequency and a time slot, and the center device allocates a communication line allocated to a line request from the terminal device to each of the terminal devices. Into a unique part and a common part corresponding to the terminal unit, and taking into account the line use situation of each terminal device, when the use line of the allocating unit of the unique part becomes full, the line of the common part is sequentially assigned to the unique part. This is a digital disaster prevention radio system characterized by realizing a duplex communication by allocating as a part allocating unit.

Therefore, according to the present invention, since the communication slot is expanded, when the administrative union acquires the wireless license and introduces the regional disaster prevention wireless system, the communication path is changed to the local governments constituting the administrative union. It is possible to construct a wireless shared use method in which a fixed amount is assigned to a certain amount of unique parts, and the common part is configured as a fixed shared part that is jointly used as a whole. It should be noted that duplex communication can be realized by designating two channels, uplink and downlink, when specifying channels for communication between terminals and between terminal centers.

[0012] The present invention is also a digital disaster prevention radio system comprising a center device for performing line allocation control of a disaster prevention radio system and a plurality of terminal devices for communicating with each other on a designated line. Digitized by the disaster prevention wireless system, a plurality of communication slots are configured by combining a frequency and a time slot,
The communication line allocated to the line request from the terminal device is divided into a fixed allocation portion allocated to a specific terminal device having a high priority and a common allocation portion allocated to other terminal devices. The terminal device uses all of the fixed allocation portions allocated in advance as common portions, and the other terminal devices use only the common allocation portions to perform line allocation for effective use of the lines. It is a digital disaster prevention wireless system that is a feature.

Therefore, in the present invention, the line assignment is
The communication line allocated to the line request from the terminal device is divided into a fixed part and a common use part of each of a plurality of administrative organizations or the like, and when the communication of each user is being used for a predetermined amount, the common part is divided. A communication line to be sequentially allocated or allocated is divided into a part to be allocated to a specific user and a common part to be allocated to other users, and in the event of a disaster, the specific user is using all of the pre-allocated fixed parts. At times, the common part is used, and other users use only the common part.

Thus, according to the present invention, when sharing a line between a local disaster prevention radio system and a system for another purpose,
In normal times, both the regional disaster prevention wireless system and other systems use their own lines, and in the event of a disaster, the regional disaster prevention wireless system section always secures a certain amount of lines even when usage is low,
It is possible to cope with a sudden line request and to construct a system for utilizing the shared use when the traffic volume of the local disaster prevention radio system unit is expanded.

Further, the present invention is a digital disaster prevention radio system comprising a center device for performing line allocation control of a disaster prevention radio system and a plurality of terminal devices for communicating with each other on designated lines. Digitized by the disaster prevention wireless system, a plurality of communication slots are configured by combining a frequency and a time slot,
A communication line to be allocated to a line request from the terminal device is divided into a unique portion corresponding to each of the terminal devices and a common portion to be allocated to a specific terminal device having a high priority among the terminals, and is normally partitioned. Dividing the frequency band for every terminal device including the specific terminal device,
All of the terminal devices perform communication between all of the terminal devices using the center device including a line control device for performing line assignment, and the line is connected to the center device in an emergency. The digital disaster prevention radio system is characterized in that only a specific center device assigns lines for the entire band, and the other center devices are assigned to operate as standby standby.

Therefore, according to the present invention, when a plurality of users share a frequency band to construct a disaster prevention wireless system, the frequency band is normally divided for each user, and each user performs line allocation. Communication between terminals is performed using a center device including a line controller, but in an emergency such as a disaster, only a specific center device performs comprehensive and efficient operation by allocating lines for the entire band. The other center devices operate as standby standby.

Thus, according to the present invention, in a digitized disaster prevention wireless system, one slot is normally allocated to one communication, but a plurality of slots are allocated according to a communication request, and furthermore, all slots are used, and MPEG4 is used.
In order to realize the 32 kbps moving image transmission, it is possible to construct a disaster prevention wireless system in which the number of used slots and the signal transmission direction are indicated by the control information.

Further, the present invention is a digital disaster prevention radio system comprising a center device for performing line allocation control of a disaster prevention radio system and a plurality of terminal devices for performing mutual communication on designated lines. Digitized in the disaster prevention wireless system, within a communication channel that configures a plurality of communication slots by combining frequency and time slots,
Intercommunication information to be disclosed as the usage of the terminal device,
Divided into control information that is a system usage not disclosed to the terminal device, and by a line instructed from a center device that performs line allocation control, for control information to a plurality of the terminal devices communicating with each other, This is a disaster prevention information system which incorporates information indicating the number of used slots.

Therefore, according to the present invention, it is possible to construct a disaster prevention information system in which the communication channel is divided into a portion used by the user and a portion used by the system, and information indicating the number of used slots is incorporated into the portion for the system.

Further, the present invention is a digital disaster prevention radio system comprising a center device for performing line allocation control of a disaster prevention radio system and a plurality of terminal devices for communicating with each other on a designated line. Digitized in the disaster prevention wireless system, within a communication channel that configures a plurality of communication slots by combining frequency and time slots,
Intercommunication information to be disclosed as the usage of the terminal device,
Divided into control information, which is a system usage not disclosed to the terminal device, based on a designated line and a designated condition, among the plurality of terminal devices that communicate with each other, mutually exchange the control information. A digital disaster prevention radio system for transmitting, by specifying, in the control information, the number of slots to be used and the directionality, aiming for effective use of a line that matches the states of the terminal devices, and allocating the line. .

Therefore, according to the present invention, the communication signal between the center device and the terminal device is digitized, and is constituted by a control information channel and a plurality of mutual communication channels. The terminal uses slots for uplink and downlink duplex communication, but according to the request of the terminal device,
Along with allocating a plurality of slots in one direction, the direction is specified in the control information and the number of available slots, and the terminals are matched with each other. As a result, it is possible to construct a disaster prevention wireless system that transmits communication conditions during communication between terminals and matches the mutual conditions.

Further, the present invention is a digital disaster prevention radio system comprising a center device for performing line allocation control of a disaster prevention radio system and a plurality of terminal devices for communicating with each other on a designated line, In the disaster prevention radio system, a communication signal between the center device and the terminal device is digitized, and a channel used for control information and a plurality of channels used for mutual communication are configured. Transmits information indicating compression / decompression attributes,
This digital disaster prevention wireless system is characterized by changing the precision of information according to the situation and increasing the line utilization efficiency.

Therefore, according to the present invention, it is possible to transmit information indicating the compression / expansion attribute of a signal to be transmitted as control information, change the density of the information according to the situation, and improve the line utilization efficiency. . In this way, by including information indicating the processing speed of the codec in the slot used by the system, the quality / decoding condition of the audio information is indicated,
It is possible to construct a disaster prevention wireless system that can respond to broadcasting with high-definition audio such as MP3.

Further, the present invention is a digital disaster prevention radio system comprising a center device for performing line allocation control of a disaster prevention radio system and a plurality of terminal devices for communicating with each other on a designated line. In the disaster prevention wireless system, a communication signal between the center device and the terminal device is digitized, and a channel used for control information and a plurality of channels used for mutual communication are configured. By transmitting information indicating the attribute of compression / decompression, and transmitting voice information through a communication channel, and temporarily storing a received signal in the terminal device, referring to the control information and reading out the signal at an optimal speed for sound quality This is a digital disaster prevention wireless system characterized by raising the line use efficiency.

Therefore, according to the present invention, a communication signal between the center device and the terminal device is digitized, and is constituted by a control information channel and a plurality of mutual communication channels.
The information indicating the compression / expansion attribute of the signal to be transmitted to the control information and the voice information are transmitted on the communication channel, the received signal is temporarily stored in the terminal device, and the optimum speed for the sound quality is referred by referring to the control information. As a result, the sound quality required for a loudspeaker system can be ensured, and the loudspeaker can be used as a loudspeaker system, thereby increasing the line utilization efficiency.
This system has a storage-type loudspeaker function for temporarily storing sound expansion and restoring it based on decoding conditions.

Further, the present invention is a digital disaster prevention radio system comprising a center device for performing line allocation control of a disaster prevention radio system and a plurality of terminal devices for performing mutual communication on designated lines, In the disaster prevention wireless system, a communication signal between the center device and the terminal device is digitized, and is configured by a channel used for control information and a plurality of channels used for mutual communication, and an attribute of a signal transmitted to the control information. And the terminal device transmits information to be communicated on a communication channel, the terminal device temporarily stores a received signal by a signal processing device, converts the information with reference to the control information, and generates new information. This is a digital disaster prevention wireless system characterized by raising the line use efficiency.

Therefore, according to the present invention, a communication signal between the center device and the terminal device is digitized, and the digitized communication signal is constituted by a control information channel and a plurality of mutual communication channels. After transmitting the information to be communicated with the information to be communicated on the communication channel and temporarily storing the received signal in the signal processing device or the like in the terminal device, referring to the control information, converting the received signal into a foreign language stored in the storage device, By implementing the above, conversion into a necessary language or the like and reading out the data can improve the situation.

Therefore, according to the present invention, information to be transmitted is created by a number, numerical information is transmitted with reference to a ROM table, and information is generated / reproduced from the numerical value, thereby constructing a multi-national disaster prevention wireless system. You can do it.

It is needless to say that the present invention can realize a communication system used for a device to be used, a center device, or the above-mentioned digital disaster prevention radio system, which are elements constituting the digital disaster prevention radio system.

[0030]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of a digital disaster prevention radio system according to an embodiment of the present invention.
In FIG. 1, a center device 101 has its own antenna 1
11, each terminal device 102, 103, 104, 1
05, 106, and 107 respectively.
13, 114, 115, 116 and 117 are communicatively connected.

In such a configuration, the center device 101 in the disaster prevention wireless system is connected to each of the terminal devices 102 to 1.
In step 07, line allocation control is performed according to the line use request. Each of the terminal devices 102 to 107 performs mutual communication with the center device 101 in the disaster prevention wireless system, with the permission of the center device 101. Such mutual communication is performed by the antenna 111 of the center apparatus 101.
And each antenna 1 of each of the terminal devices 102 to 107
The communication is performed by mutually wirelessly communicating information between 12 and 117. In the example of this figure, although the terminal devices 102 to 107 are shown as six, there is no restriction on the number of terminal devices.

FIG. 2 is a block diagram showing the internal configuration of the center device 101 in FIG. That is, the center device 101 is connected to the known R connected to the antenna 111.
F section 201, known demodulation section 202, and known modulation section 2
03, a TDMA / TDD processing unit 204, a voice codec unit 205, a known speaker 206, a known microphone 207 that can be integrated with the speaker 206 by a handset, a RAM 208, a ROM 209, and a CPU 2
10, a timer 211, an operation unit 212, and a storage area 213 for storing a voice codec procedure program.

In FIG. 2, RF section 201 converts the signal into a high-frequency signal for mutual communication, transmits the signal to antenna 111, and restores the high-frequency signal transmitted from antenna 111 to the original signal. Further, demodulation section 202 converts the received signal into a form that can be processed internally. Further, modulation section 203 converts the received signal into a form for transmission. Also, the TDMA / TDD processing unit 204 controls transmission and reception, divides into a transmission voice signal, a reception mutual communication channel, and a control signal, and further integrates these.

The speech codec unit 205 converts the mutual communication channel into a transmissible code and restores the received signal to the original signal. At this time, if the amount of information at the time of encoding is large, the sound quality is improved, but the number of channels that can be transmitted at the same transmission rate decreases. The speaker 206 converts an electric signal into a sound. Further, the microphone 207 converts sound into an electric signal.

The RAM 208 stores C information such as traffic information.
The data required by the PU 210 is stored. Also, RO
M209 stores an execution program of the CPU 210.
The CPU 210 controls the system. further,
The timer 211 supplies time information to the CPU 210.
The operation unit 212 is an interface for performing manual control, and supplies switch information and the like to the CPU 210. Then, the storage area 213 stores the encoding and decoding procedures of the audio, retrieves them according to the instruction of the CPU 210, and supplies them to the audio codec 205.

FIG. 3 shows each of the terminal devices 102 to 102 in FIG.
FIG. 107 is a block diagram illustrating an internal configuration of an embodiment of the present invention. Although the example of this figure shows the internal configuration of the terminal device 102, the other terminal devices 103 to 107 have the same configuration. That is, this terminal device has the antenna 11
2 and a known demodulation unit 3
02, a known modulation unit 303, a TDMA / TDD processing unit 304, a voice codec unit 305, a known speaker 306, a known microphone 307 that can be integrated with the speaker 306 by a handset, a RAM 308,
It comprises an OM 309, a CPU 310, and a storage area 311 for storing a speech codec procedure program.

That is, in FIG.
Converts the intercommunication channel into a high-frequency signal and sends it to the antenna 112, and also restores the high-frequency signal sent from the antenna 112 to the original signal. The demodulation unit 3
02 converts the received signal into a form that can be processed internally. Further, modulation section 303 converts the signal into a form for transmission. Also, the TDMA / TDD processing unit 304
Controls transmission and reception, divides a transmission voice signal, a reception mutual communication channel, and a control signal, and integrates them.

The speech codec unit 305 converts the mutual communication channel into a transmissible code and restores the received signal to the original signal. Further, the speaker 306 converts an electric signal into a sound, and the microphone 307 converts the sound into an electric signal. Further, the RAM 308 stores data required by the CPU 310, such as information for selecting a speech encoding / decoding method. Further, the ROM 309 stores the CPU 31
0 execution program is stored. Further, the CPU 310 controls the system. And the storage area 311 is
A procedure program for voice encoding and decoding is stored, and CP
It is taken out and supplied to the voice codec 305 according to the instruction of U310.

FIG. 4 is a configuration diagram of a communication channel in the digital disaster prevention radio system according to the embodiment of the present invention.
The communication channel 401 includes unit communication channels 402, 403, 404, 405, and 406 that constitute a unit frame.
It is constituted by a combination of 407 and 408. That is, one frame of the communication channel 401 is a combination of a frequency and a communication slot.

Here, the communication channel 401 indicates a configuration of a communication channel between the center apparatus 101 and each of the terminal apparatuses 102 to 107, and a plurality of communication channels are configured by a combination of frequency division and time division. The unit communication channels 402 to 409 are used as communication paths between terminal devices. Although the unit communication channels 402 to 409 are shown as seven items, there is no restriction on the number of items.

FIG. 5 is a detailed diagram showing one configuration of a communication message of each unit communication channel of the communication channel in FIG. That is, FIG. 5 is an explanatory diagram of a case in which the entire communication channel 401 is divided into a unique part and a common part, divided into blocks, and finely divided for allocation. In the figure, one frame of the communication channel 401 is a combination of a frequency and a communication slot, and the unit communication channel 402 forms one frame. Further, within one frame of the unit communication channel 402, the intra-frame divided communication channels 501 and 502,
503, 504, 505, 506, 507, 508.

The intra-frame divided communication channel 50
Unit communication channel 402 constituted by 1 to 508
Is a user-assigned communication slot group 50 to be assigned to a user.
9. The common assignment communication slot group 510 assigned for common use includes the intra-frame divided communication channel 51.
1, 512, 513, 514, 516, 517, 51
8 and control information bits 515 in one slot in the frame.

Intra-frame divided communication channels 501 to 50
8, the intra-frame divided communication channels 511 to 514, 5
16 to 518 and the control information bit 515 are one communication channel for mutual communication between the terminal devices 102 to 107 and the like. The control information bit 515 constituting one slot in the frame indicates audio information or control information itself.

FIG. 6 is a detailed diagram showing another configuration of the communication message of each unit communication channel of the communication channel in FIG. That is, FIG. 6 is an explanatory diagram of a case where the entire communication channel 401 is divided into a specific user and other users, and the communication channel 401 is divided into blocks and finely divided for allocation.

In the figure, one frame of the communication channel 401 is a combination of a frequency and a communication slot, and the unit communication channel 402 forms one frame. Also,
In one frame of the unit communication channel 402, the intra-frame divided communication channels 601, 602, 603, 604, 6
05, 606, 607, and 608. Then, the intra-frame divided communication channels 601 to 60
The unit communication channel 402 constituted by 8 constitutes a user-assigned communication slot group 609 assigned to a specific user in the frame.

The user-assigned communication slot group 610 assigned to a general user in the frame includes divided communication channels 611, 612, 613, 614, and 61 in the frame.
5, 616, 517, and 518.

The intra-frame divided communication channels 601 to 601
608 and the intra-frame divided communication channels 611-618.
Is a communication channel for mutual communication between the terminal devices 102 to 107 and the like, and indicates control information bits forming one slot in a frame.

FIG. 7 is a diagram showing a configuration of a frequency-assigned communication signal in the digital disaster prevention radio system according to the embodiment of the present invention. That is, this figure shows the configuration of control information divided into a control information channel and an intercommunication channel. In the figure, the entire communication channel frame 700 is divided into a plurality of unit frames.

Each unit frame includes communication information bits 701 constituting one communication channel in the entire communication channel frame 700 and communication information bits 702 and 70 forming one communication channel in the entire communication channel.
3, 704, 705, 706, 707, 708. In the bit group 709 of such a unit frame, one communication channel in the entire communication channel is configured by communication information bits and control information bits.

In the bit group 710, one communication channel in the entire communication channel is constituted entirely by control information bits. And, this bit group 710 is a communication information bit 71 constituting one communication channel in the entire communication channel.
1, 712, 713, 714, 715, 716, 71
7, 718.

FIG. 8 shows each of the terminal devices 102 to 102 in FIG.
FIG. 107 is a block diagram showing an internal configuration of another embodiment 107. The terminal device of this embodiment differs from the terminal device shown in FIG. 3 in that a signal storage unit 801 is provided between a TDMA / TDD processing unit 304 and a speech codec unit 305.
That is, As described above, by providing the information storage function of the signal storage unit 801 before the audio codec unit 305, it is possible to support different compression / decompression methods or to generate foreign language information by referring to Japanese information. Can be held.

FIG. 9 shows a communication sequence between the center device, each terminal device, and the terminal devices according to the embodiment of the present invention. The originating terminal device 102 sends a line assignment request signal 911 to the center device 101 and sends a communication condition transmission signal 912 to the center device 101. The center apparatus 101 transmits the channel to be used to the transmitting terminal apparatus 102 and the receiving terminal apparatus 103 by using communication condition notification signals 913A and 913B, respectively.

After that, the center device 101 uses the mutual communication signals 914A and 914B to determine the communication conditions, respectively, of the terminal device 102 on the transmitting side and the terminal device 103 on the receiving side.
Transmit to In this way, the terminal device 102 on the calling side
Transmits the communication conditions to the terminal device 103 on the receiving side using the communication condition notification signals 913A and 913B. further,
The transmitting terminal device 102 and the receiving terminal device 103
The mutual communication 91 using the mutual communication signals 914A and 914B.
Perform steps 5 and 916.

FIG. 10 shows a signal storage unit 8 as shown in FIG.
This is a communication sequence between the respective devices including the processing in the terminal device when 01 is added. In addition to the sequence between the devices described in FIG. 9, the low-speed data 1111 from the terminal device 103 to the signal storage unit 801 and the signal storage unit 80
High-speed data 111 from 1 to the voice codec unit 305
2 communication sequences have been added.

In this communication sequence, when the transmission speed on the line is slower than the signal to be decoded, the signal of the low-speed data 1111 is temporarily stored in the signal storage unit 801 in each terminal device, and then reproduced. The signal of the high-speed data 1112 is read out at an appropriate speed for transmission to the voice codec 305 in the terminal device and decoded. This signal includes transmitting image information other than audio as digital information and restoring it for display, language conversion from Japanese to a foreign language such as English, and the like.

The basic operation of the digital disaster prevention radio system according to the present invention will be described below. This digital disaster prevention radio system is composed of a center device that performs line allocation control, and a plurality of terminal devices that communicate with each other on a designated line. Then, communication between the center device and each terminal device and between the terminal devices are digitized, and a communication path is configured by a control information channel and a plurality of mutual communication channels. ADPCM
Between the sender and the receiver of information such as speech coding schemes such as MDP-CELP, data transmission speed, whether the number of channels used for communication is single or plural, and whether unidirectional communication or bidirectional communication. Specify the direction of communication. At this time, the control information is confirmed between the terminal devices and the state is adjusted.

Also, MP3, ADPCM, MDP-CE
Transmits information indicating compression / expansion attributes of signals such as LP,
It changes the fineness of information according to the status of the line related to traffic and increases the line utilization efficiency. Then, when performing communication between the terminal devices and between the terminal device and the center device, the duplex communication is performed by designating the transmission channels of the calling side and the called side at the time of designation. Realize.

In a system composed of a plurality of users,
The line allocation divides a communication line to be allocated in response to a line request from a terminal device into a fixed part and a common use part of each of a plurality of administrative organizations or the like, and the communication of each user is in use by the predetermined amount. In the case of (1), the common part is sequentially allocated or the communication line to be allocated is divided into a part allocated to a specific user and a common part allocated to other users. Then, in a disaster or the like, a specific user uses a common portion when all fixed portions allocated in advance are in use, and other users use only the common portion. This selection procedure is stored in the ROM as a program,
Switch as setting condition.

When a plurality of users share a communication channel to construct a disaster-prevention wireless system, the communication channel is normally divided for each user, and each user is provided with a center including a line control device for performing line allocation. Terminals communicate with each other using devices, but in an emergency such as a disaster, only a specific center device performs overall and efficient operation by allocating lines for the entire band, and operates in a centralized manner. The device operates as a standby. This content is one item of the selection procedure.

Further, a communication signal between the center device and the terminal device is digitized, and is constituted by a control information channel and a plurality of mutual communication channels, and information indicating compression / expansion attributes of a signal to be transmitted to the control information. In this case, voice information is transmitted through a communication channel, and a terminal device temporarily stores a received signal, and refers to control information to read out the signal at a speed optimal for sound quality, thereby increasing line utilization efficiency.

Further, a communication signal between the center device and the terminal device is digitized, and is constituted by a control information channel and a plurality of mutual communication channels. The terminal transmits information to be communicated, and the terminal device temporarily stores the received signal by a signal processing device or the like, converts the signal into a required language or the like, and reads it.

Hereinafter, referring to FIGS. 1 to 8 described above,
The operation of the digital disaster prevention radio system according to the embodiment of the present invention will be specifically described.

Center device 1 of digital disaster prevention radio system
01 assigns a communication channel as a communication line to be communicated in response to a line use request from the terminal devices 102 to 107. Center device 101 and terminal devices 102 to 107
Implements mutual communication using the speakers 206 and 306 and the microphones 207 and 307, respectively.
Further, the terminal devices 102 to 107 are mutually
Communication is performed with the center device 101 or 2 to 107 or the center device 101. Further, the center device 101 determines the belonging attributes of the terminal devices 102 to 107 that have made the communication request from the request signal, performs the line assignment, and stores the traffic information in the memory.

The center device 101 has terminal devices 102 to 1
When a communication line allocation request is received from the unit 07, the unit communication channels 402 to 409 are allocated as communication slots constituting the entire communication channel 401.

In the allocation method, the intra-frame divided communication channels 501 to 508 are classified into a user-allocated communication slot group 509 for allocating to a certain user, and the intra-frame divided channels 501 to 508 are classified into a user-allocated communication slot group 509 as a common communication slot. And communication channel 401
Sequentially assigns the intra-frame divided communication channel 5 to the user to which the user-assigned communication slot group 509 is assigned.
From 01, the intra-frame division communication channel 508 is allocated.

If the intra-frame divided communication channel 501
Are allocated to the user-assigned communication slot group 509, the intra-frame divided communication channels 511 to 518 included in the common assigned communication slot group 510 are assigned while adjusting to other users' requests. If each user has a unique usable slot group and the allocated capacity is exceeded, the common part is used while being adjusted with other users, so that the line can be effectively used.

When communication is performed between the terminal devices and between the terminal device and the center device, the mutual communication channel is set as follows.
A duplex communication is realized by specifying a combination of an even number and an odd number when specifying a channel. For example, the outgoing channel of the calling terminal device 102 is set as the intra-frame divided communication channel 501, and the outgoing channel of the called terminal device 103 is set as the intra-frame divided communication channel 502.

Further, in another allocation method, the intra-frame divided communication channels 601 to 608 are used as a user-allocated communication slot group 609 for specific user allocation, and the intra-frame divided communication channels 611 to 618 are allocated to other users. As a user-assigned communication slot group 610 to be assigned to a group, a line is assigned in response to a line request from each user.

For a line request from a specific user,
The intra-frame division communication channels 601 to 618 are allocated, and the intra-frame division communication channels 611 to 618 are allocated to line requests from other users. When the traffic of the specific user rises and the intra-frame divided communication channels 601 to 608 are all in use, the unused intra-frame divided communication channels 610 to 618 are allocated.

By doing so, it is possible to preferentially secure the line of the specific user and realize communication of other users. According to this method, the intra-frame divided communication channels 501 to 508 and the line allocation of the intra-frame divided communication channels 511 to 518 can coexist, and the lines can be effectively used.

The communication signal entire frame 700 is divided into a control information channel and an intercommunication channel to transmit control information.
The data is divided and transmitted using one bit in one frame, or transmitted as information of communication information bits 711 to 718.

Further, the center apparatus 101 of the digital disaster prevention radio system and the plurality of terminal apparatuses 102 to 107 which perform mutual communication on the designated line perform transmission using a control information channel. At this time, between the center device 101 and the terminal devices 102 to 107, the audio encoding method such as MP3, ADPCM, or MDP-CELP, which is a signal compression / expansion method, is stored in the storage area 213 of the audio codec procedure program. , 311 are stored. And
By selecting the control information based on the mutual communication and designating the execution procedure in the voice codec units 205 and 305, communication between the terminal devices and between the terminal device and the center device can be realized. Further, by transmitting information indicating the compression / expansion attribute of the signal, transmitting the information at a low speed over a wireless line, and performing the reproduction at a high speed, a loudspeaker function can be realized.

Further, by accumulating and reproducing information in the signal accumulating unit 801, it is possible to change the density of information according to the degree of use in accordance with the line conditions related to traffic, thereby improving the line use efficiency. Can be raised.

Further, information is stored in the signal storage unit 801 in advance, and new information is generated from the received information, so that the information generated in Japanese can be easily converted into new information in a language for foreigners. By generating, an effective system can be constructed. Also, the center device 1
01 and the terminal devices 102 to 107 communicate with the microphone 207
Is converted into a digital signal by a voice codec unit 205, and the TDMA / TDD processing unit 204
Is converted into a predetermined signal form by the modulation section 203, and further converted into a high-frequency signal by the modulation section 203.
It is released into the air via 11. Then, it is captured via the respective antennas 112 to 117 of the terminal devices 102 to 107.

In each of the terminal devices 102 to 107, the demodulation section 302 restores a high-frequency signal to an audio band signal, the audio codec section 305 restores a digital signal to an audio signal, and reproduces the audio from the speaker 306. .

In communication from each of the terminal devices 102 to 107 to the center device 101, an audio signal input from the microphone 307 is converted into a digital signal by the audio codec unit 30 and converted into a predetermined signal format by the TDMA / TDD processing unit 304. Then, the signal is converted into a high-frequency signal by the modulation unit 303 and emitted to the air via the antenna 211 of the terminal device 201, for example. Then, the antenna 11 of the center device 101
Captured via 1 In the center device 101, the demodulation unit 202 restores a high-frequency signal to a signal in an audio band, the audio codec unit 205 restores a digital signal to an audio signal, and reproduces the audio from the speaker 206. Note that the description is omitted because the same applies to the terminals.

Center device 1 of each of terminal devices 102 to 107
The CPU 210 issues a line allocation request to the
09 and decodes the execution program stored in the RAM 30.
8 is used as a work area to form a transmission digital signal, and T
The signal is converted by the DMA / TDD processing unit 304 into a predetermined signal form. Further, the signal is converted into a high-frequency signal by the modulation unit 303,
For example, it is emitted into the air via the antenna 112 of the terminal device 102 or the like. Then, it is taken in via the antenna 111 of the center device 101.

In the center device 101, the high-frequency signal is restored to a predetermined signal by the demodulation unit 202, the CPU 210 decodes the digital signal into an execution program stored in the ROM 209, and analyzes the information using the RAM 208 as a work area.

The CPU 210 of the center device 101
Line allocation is performed with reference to the allocation reference stored in M209 and the line usage status stored in RAM 208,
The digital signal for transmission of the CPU 210 is constituted by TDMA
The signal is converted into a predetermined signal form by the / TDD processing unit 204, further converted into a high-frequency signal by the modulation unit 203, and emitted to the air via the antenna 112 of the terminal device 102.

The terminal devices 102 to 107 are connected to the center device 1
The line allocation information from 01 is fetched via the antenna 111. Then, in the terminal devices 102 to 107, the CPU 310 decodes the digital signal restored from the high-frequency signal into a predetermined signal by the demodulation unit 302, decodes an execution program stored in the ROM 309, and analyzes information using the RAM 308 as a work area. , Set various information for performing communication. In addition, in each of the terminal devices 102 to 107, the CPU 310 also sets control information at the time of mutual communication in the same manner as described above.

Further, voice compression / decompression algorithms include MP3, ADPCM, MDP-CELP, and the like.
13, 311.

The CPUs 210 and 310 have a ROM 209,
Reference is made to the execution program of the center device and the terminal device of the digital disaster prevention radio system stored in
208 and 308 are used as a primary work area for executing the program, and are sequentially operated. At this time, the center device 10
In step 1, an operation or a start signal from the outside is input from the operation unit 212 and transmitted to the CPU 210, and a start time and an end time are transmitted to the CPU 210 by the timer 211.

Next, the operation will be described with reference to a communication sequence diagram. In FIG. 9, when the terminal device 102 is a caller and communicates with the terminal device 103, the center device 10
1 and a communication sequence with the called terminal device 103 will be described.

When communicating with the terminal device 103 on the receiving side, the terminal device 102 on the transmitting side is required to occupy the line during a call in order to ensure communication between the terminal devices via the wireless line. The line assignment request signal 911 is sent to the center device 1
01, and also transmits a communication condition transmission signal 912 such as the number of slots to be used, the directionality of the signal, and the type of voice codec for compressing / expanding the voice to the center apparatus 101.

Then, the center apparatus 101 grasps the above-mentioned line use state, and transmits the communication channel to be used to the terminal apparatus 102 on the transmitting side and the terminal apparatus 103 on the receiving side by using communication condition notification signals 913A and 913B. introduce. Then, after transmitting the use channel instruction signal, the center device 101
Transmits the mutual communication signals 914A and 914B to the terminal device 102,
The communication condition is transmitted to the terminal device 102 on the transmitting side and the terminal device 103 on the receiving side.

As a result, the terminal device 102 on the calling side
Before realizing the mutual communication, the communication condition notification signal 913
A, 913B is used to transmit communication conditions to the terminal device 103 on the receiving side. Then, after the communication conditions between the terminal devices match, the terminal device 102 on the transmitting side and the terminal device 103 on the receiving side communicate with each other using the mutual communication signals 914A and 914B.

When transmitting a music signal through a wireless line, the music needs a higher bandwidth than the voice transmission because the sound source of the music requires a wider band than the voice. Therefore,
The original signal is encoded at a high speed and transmitted at a low speed using a wireless line. Then, the signal storage unit 801 is newly added to the terminal device.
And a signal of low-speed data 1111 and a signal of high-speed data 1112 are newly provided, and the signal storage unit 8 in the terminal device is provided.
01, the low-speed data 1111 is temporarily stored at the communication speed of the received wireless line, and reproduced as music or the like. further,
Faster high-speed data 1112 suitable for decompression
Is read and transmitted to the audio codec unit 305 in the terminal device for decoding.

Here, by making the read compression / expansion method and the read speed variable between terminals, the line can be effectively used, and music information can be transmitted by the MP3 method in the disaster prevention wireless system. .

Further, information sent from TDMA / TDD processing section 304 to signal storage section 801 is stored in signal storage section 801.
The information is converted, and new information can be generated by performing the information conversion and providing the information to the speech codec unit 305.

In the above communication sequence, the line allocation request signal 911 and the communication condition transmission signal 912 can be integrated. Further, a communication condition notification signal 913
A, 913B and the intercommunication signals 914A, 914B can be integrated. Also, the communication condition transmission signal 91
2 and the communication condition notification signals 913A and 913B can be substituted by any one. Furthermore, although the above description has been made of communication between terminal devices as an example, the same applies to communication between terminal devices and the center device.

The embodiment described above is an example for explaining the present invention, and the present invention is not limited to the above embodiment, and various modifications are possible within the scope of the invention. is there. For example, while the above description has been made with reference to a speech codec, the present invention is not limited to this. For example, compression / decompression of an image codec, compression / decompression of information, and information search may be performed.
Similarly, it goes without saying that the invention can be implemented. Further, although the above description has been made with respect to the hardware configuration, the hardware may be configured using a microprocessor or a digital signal processor, and the functions may be realized by switching the software. As described above, according to the embodiment of the present invention, it is possible to effectively use a wireless line and equipment, and to construct an economically effective digital disaster prevention wireless system.

[0093]

As described above, according to the digital disaster prevention radio system of the present invention, communication can be performed according to each phase at the time of disaster and non-disaster, immediately after disaster, at the time of information concentration, and at the time of information reduction. it can. Further, it is possible to improve the use efficiency of a finite wireless line, and to reduce the system cost for constructing these systems. As a result, a digital disaster prevention radio system with excellent operability can be realized economically and efficiently by effectively utilizing the limited frequency resources.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a digital disaster prevention radio system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an internal configuration of a center device 101 in FIG.

FIG. 3 is a block diagram showing an internal configuration of one embodiment of each of the terminal devices 102 to 107 in FIG. 1;

FIG. 4 is a configuration diagram of a communication channel in the digital disaster prevention wireless system according to the embodiment of the present invention.

5 is a detailed view showing one configuration of a communication message of each unit communication channel of the communication channel in FIG. 4;

FIG. 6 is a detailed diagram showing another configuration of a communication message of each unit communication channel of the communication channel in FIG. 4;

FIG. 7 is a diagram showing a configuration of a frequency-assigned communication signal in the digital disaster prevention radio system according to the embodiment of the present invention.

FIG. 8 is a block diagram showing an internal configuration of another embodiment of each of the terminal devices 102 to 107 in FIG. 1;

FIG. 9 shows a communication sequence between the center device, each terminal device, and the terminal device according to the embodiment of the present invention.

FIG. 10 shows a communication sequence between devices including processing in a terminal device when a signal storage unit 801 as shown in FIG. 8 is added.

[Explanation of symbols]

101 Center device 102-107 Terminal device 111-117 Antenna 201, 301 RF unit 202, 302 Demodulation unit 203, 303 Modulation unit 204, 304 TDMA / TDD processing unit 205, 305 Audio codec unit 206, 306 Speaker 207, 307 Microphone 208 , 308 RAM 209, 309 ROM 210, 310 CPU 211 Timer 212 Operation unit 213, 311 Storage area 401 Communication channel 402-409 Unit communication channel 501-508, 511-514, 516-518, 6
01 to 608, 611 to 618 Intra-frame divided communication channels 509, 609, 610 User-assigned communication slot group 510 Common-assigned communication slot group 515 Control information bit 700 Communication channel entire frame 701 Communication information bits in frame 702 to 708, 711 718 Communication information bits 709, 710 Bit group 801 Signal storage unit 911 Line allocation request signal 912 Communication condition transmission signal 913A, 913B Communication condition notification signal 914A, 914B Intercommunication signal 1111 Low speed data 1112 High speed data

Claims (9)

[Claims] 1. A digital disaster prevention wireless system in which a center device that performs line allocation control of a disaster prevention wireless system and a plurality of terminal devices that communicate with each other via a designated line are connected by a communication path. Digitizing communication between a device and the terminal device, wherein the communication path is constituted by a plurality of mutual communication channels disclosed to the terminal device and a control information channel not disclosed to the terminal device; Depending on the information channel, the speed of speech coding,
A digital disaster prevention radio system, wherein the number of channels used for communication and the directions of a caller and a receiver are specified for the communication path to realize a duplex communication. 2. A digital disaster prevention radio system comprising: a center device that performs line allocation control of a disaster prevention radio system; and a plurality of terminal devices that communicate with each other over a designated line. And a plurality of communication slots are configured by combining a frequency and a time slot. The communication line allocated by the center device in response to a line request from the terminal device is unique to each of the terminal devices. Into a common part and a common part, taking into account the line usage status of each terminal device, and when the use line of the allocating unit of the unique part is full, sequentially assigning the line of the common part to the allocating unit of the unique part Digital disaster prevention wireless system characterized by realizing duplex communication by assigning as 3. A digital disaster prevention radio system, comprising: a center device that performs line allocation control of the disaster prevention radio system; and a plurality of terminal devices that communicate with each other over a designated line. And a plurality of communication slots are configured by combining a frequency and a time slot, wherein the center device allocates a communication line allocated to a line request from the terminal device to a specific terminal device having a high priority. In the event of an emergency, a specific terminal device uses all of the previously allocated fixed allocation portions as a common portion, and the other terminal devices. Is a digital feature that uses only the common allocation part to allocate lines for effective use of lines. Disaster wireless system. 4. A digital disaster prevention radio system comprising: a center device for performing line allocation control of the disaster prevention radio system; and a plurality of terminal devices for communicating with each other on a designated line. Digitizing, configuring a plurality of communication slots by combining a frequency and a time slot, wherein the center device allocates a communication line assigned to a line request from the terminal device to a unique portion corresponding to each of the terminal devices, Blocking into a common part to be assigned to a specific terminal device having a high priority among the terminals, and in normal times, the frequency band is divided for every terminal device including the specific terminal device, and all the terminal devices are ,
Using the center device including a line control device for performing line assignment, communication is performed between all of the terminal devices. In an emergency, only a specific center device among the center devices is used in an emergency. A digital disaster prevention radio system, wherein a line is assigned to the entire band, and the other center devices are assigned to operate as standby standby. 5. A digital disaster prevention radio system comprising: a center device that performs line allocation control of the disaster prevention radio system; and a plurality of terminal devices that communicate with each other over a designated line. And communication information that discloses a communication channel constituting a plurality of communication slots by combining a frequency and a time slot as the usage of the terminal device, and control information that is a system usage not disclosed to the terminal device. And information indicating the number of used slots is incorporated into control information to the plurality of terminal devices that communicate with each other by a line specified by a center device that performs line allocation control. Disaster prevention information system Disaster prevention wireless system. 6. A digital disaster prevention radio system, comprising: a center device that performs line allocation control of the disaster prevention radio system; and a plurality of terminal devices that communicate with each other over a designated line. And communication information that discloses a communication channel constituting a plurality of communication slots by combining a frequency and a time slot as the usage of the terminal device, and control information that is a system usage not disclosed to the terminal device. Based on the designated line and the designated condition, the plurality of terminal devices communicating with each other, the control information is mutually transmitted, and the control information includes the number of used slots and the direction. Digital disaster prevention wireless communication, characterized in that the terminal equipment is assigned to each other so as to make effective use of the lines that match the states of the terminal devices. Stem. 7. A digital disaster prevention radio system comprising: a center device that performs line allocation control of the disaster prevention radio system; and a plurality of terminal devices that communicate with each other via a designated line. Then, a communication signal between the center device and the terminal device is digitized, and a channel used for control information and a channel used for a plurality of intercommunications are formed, and compression / expansion of a signal transmitted to the control information is performed. A digital disaster prevention radio system that transmits information indicating attributes, changes the precision of the information according to the situation, and increases the line utilization efficiency. 8. A digital disaster prevention radio system comprising: a center device that performs line allocation control of the disaster prevention radio system; and a plurality of terminal devices that communicate with each other on a designated line. A communication signal between the center device and the terminal device is digitized, and is configured by a channel used for control information and a channel used for a plurality of intercommunications. By transmitting information indicating the attribute, and transmitting voice information over a communication channel, after temporarily storing a received signal at the terminal device, by referring to the control information and reading out at a speed optimal for sound quality,
Digital disaster prevention wireless system characterized by increasing the line utilization efficiency. 9. A digital disaster prevention radio system comprising: a center device that performs line allocation control of the disaster prevention wireless system; and a plurality of terminal devices that communicate with each other via a designated line. A communication signal between the center device and the terminal device is digitized, and is configured by a channel used for control information and a channel used for a plurality of intercommunications, and information indicating an attribute of a signal transmitted to the control information. Transmitting information to be communicated on a communication channel, the terminal device temporarily stores a received signal by a signal processing device, converts the information with reference to the control information, generates new information, and generates a line utilization efficiency. Digital disaster prevention radio system characterized by raising the height.