JP2006319590A - Watch system for local area - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a watch system for a local area capable of transmitting and receiving a crime/disaster prevention information at a low cost for all of bases in a residence zone to be watched, even if there is neither a base station nor a relay station. <P>SOLUTION: Each base 1-7 is a house or a building within a residence zone 30, which is set as an object of crime/disaster prevention management, and comprises a transceiver 10 for performing spontaneous transmission operation, reception operation, and transfer transmission operation. In the spontaneous transmission operation, an information on a crime/disaster event generated at an base is transmitted in a packet data as a crime/disaster prevention information 21. In the reception operation, a crime/disaster prevention information 21 is received from other bases. In the transfer transmission operation, the received crime/disaster prevention information 21 is transferred to other bases. If the transceiver detects radio interference in transmission to or reception from a plurality of bases based on an information constituting the crime/disaster prevention information 21, the transceiver nullifies the transmission/reception. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an area warning system for crime prevention and disaster prevention in a residential area.

  As shown in FIG. 13, a conventional local security system of this type includes a base station 111 for collecting information, a radio 113 for transmitting various warning information, a fixed relay station 112, and a relay mobile station 110. (For example, refer to Patent Document 1).

  The relay mobile station 110 receives a call signal from the base station 111 or the fixed relay station 112 to the wireless device 113 in the insensitive area and sends out a substitute signal, and the base station 111 or the fixed relay station 112 transmits the wireless signal in the insensitive area. The communication signal transmitted to 113 is received, and the communication content is recorded in the IC memory by the IC recording unit 115. Thereafter, when a transfer request signal is received from the wireless device 113 in the insensitive area, the recorded communication content is reproduced and transmitted to the wireless device 113 in the insensitive area.

  In addition, a call signal for the base station 111 or the fixed relay station 112 is received from the wireless device 113 in the insensitive area and a substitute signal is transmitted, and a communication signal transmitted from the wireless device 113 in the insensitive area is received to communicate. Is recorded, and when the transfer request signal from the base station 111 or the fixed relay station 112 is received, the recorded communication content is reproduced and transmitted to the base station 111 or the relay station 112.

Japanese Patent Laid-Open No. 11-154918 (2nd page to 3rd page, FIG. 1)

  However, according to the above-described conventional technology, all of the disaster information aggregation and countermeasure instruction are issued to the base station. In this case, when the base station function is lost, crimes and disaster information aggregation or crimes and disaster countermeasure instructions are not issued to the corresponding area, and the original problem of the local disaster prevention system cannot be performed. There is.

  In addition, if a radio station in the insensitive area (long-distance position) and the base station cannot communicate directly or via a (fixed) relay station, a relay mobile station is required. When the communication function is lost, there is a second problem that the communication from the wireless device cannot be transmitted to the base station as a system, resulting in a bottleneck.

  In addition, radios that were able to communicate directly communicate with each other due to changes in the geographical situation (occurrence of changes in installation position due to landslides, fault strikes, surface uplifts, surface depressions, etc.) where radio waves are blocked by natural disasters, etc. There is a third problem that makes it impossible. Because, due to the limitation of the number of relay mobile stations to be held, relay mobile stations for improving communication are added indefinitely between the base station and the radio so as to cope with deterioration of radio wave propagation conditions due to all potential installation position changes It is because it cannot be done.

  Also, in environments where base stations and radios communicate with each other across forested areas such as high-rise buildings, radio interference that depends on the direction of radio wave propagation is expected. Occurrence of insensitive areas will be unavoidable if operation is performed without doing so. Therefore, the installation of a relay mobile station is indispensable for improving the insensitive area. However, a fourth problem that the entire area cannot be covered and operated until the installation is completed occurs. Furthermore, with respect to the installation of the relay mobile station, it takes time to perform antenna directivity adjustment and transmission power adjustment (increase adjustment of output in the case of long distance) to the base station and relay station.

  There is also a fifth problem that the communication power cannot be kept low. The reason for this is that the wider the area of residence for crime prevention and disaster prevention, the farther away from the base station, the higher the communication power for communication to the relevant base. In addition, there is a demerit that the radio reception unit of the base station, radio station, or relay mobile station must have the opposite characteristics of high sensitivity and reception desaturation during high power transmission.

  In addition, there is a sixth problem that disaster prevention information is collected only at the base station and information cannot be deployed to the disaster occurrence area with immediacy. The reason is that a delay operation in which the disaster information from the area where the disaster has occurred is collected by the base station and undergoes some processing, and the disaster occurrence information returns to the area again cannot be avoided.

  Accordingly, a first object of the present invention is to provide timely and accurate information on crime prevention and disaster prevention information generated in a residential area without using a relay station or a relay mobile station without causing a bottleneck in communication. The purpose is to provide an area warning system that can simultaneously notify the community.

  A second object of the present invention is to provide an area warning system that can be operated without the need for antenna directivity adjustment and transmission power adjustment.

  A third object of the present invention is to provide an area warning system that does not require high power in wireless communication.

  In the regional warning system of the present invention, crime prevention and disaster prevention information is transmitted by wireless peer-to-peer communication using a non-directional antenna and a low-power transmitter / receiver at each base (house, building, etc.) in the residential area subject to crime prevention and disaster prevention management. Packet data is converted and transmitted between adjacent sites one after another. The residential area is assumed to be a densely populated area, and the distance between each base as a residential house is very close. In addition, the base means each house in the above-mentioned residential area, a housing complex, a condominium, and a resident's house or office for each house in a high-rise building.

  In the transmission method, when a packet is received between adjacent sites, the packet is temporarily accumulated at the site, and the received packet is transmitted for transfer to another site after the random time has elapsed. This is to avoid collision of packet data caused by transmission from a plurality of bases at the same timing.

  When packet data is stored in this way, at a corresponding site, the security / disaster information contained in the packet data can be received by a computer connected to the transceiver and the decoding result can be obtained. These decoding results are notified to the residents at the relevant bases visually or acoustically via the display section of the crime prevention / disaster information connected to the computer, so that the base station, relay station, relay mobile station It becomes possible to report crime prevention information without using. As a result, evacuation behavior and defense behavior based on crime prevention disaster prevention information can be promoted to the entire residential area.

  Here, storage and transfer control of packet data is performed by the above-described computer. Even when packet data having the same content is received a plurality of times at different times, once the content included in the packet data is determined once. The above-mentioned computer also performs protocol control so that only transmission is performed.

  Adopting such a configuration, gathering information into one point as in the past, transferring packet data via adjacent bases without providing a specific mechanism such as a base station reporting to the required base, Security and disaster prevention information can be reported to each base in the residential area.

  According to the present invention, the first effect is obtained that it is not necessary to use a relay station or a relay mobile station for packet data communication regardless of the size of the residential area. This is because, in the present invention, an information storage and transfer function is installed at each base (house, building, etc.) in the residential area, and is provided to a small-scale wireless transceiver that transmits and receives crime prevention and disaster prevention information wirelessly. This is because the packet data is distributed to all bases in the residential area through a plurality of bases, so that the relay function is equivalently realized.

  In addition, a second effect that a base station is unnecessary is obtained. This is because the crime prevention and disaster prevention information in the residential area is distributed to the entire residential area by storing and transferring operations between the bases by the peer-to-peer communication, so that it is not necessary to collect the information once in the base station. As a result, the packet data is not concentrated only on the base station, and problems such as limiting the number of bases that transmit the crime prevention / disaster information for smooth communication and considering the timing of communication are solved.

  In addition, since the base (house, building, etc.) that is a relay base always exists within the radio wave reach, the third effect is that wireless communication can be performed with weak wireless power in the residential area. Is obtained. As a result, in the residential area, communication can be performed using non-directional antennas by wireless communication between the bases for transmitting and receiving the crime prevention disaster prevention information, and the number of adjacent bases where packet data is stored and transferred is not limited.

  The local alert system of the present invention is a spontaneous transmission that transmits information on crime disaster events occurring at the base as crime prevention disaster prevention information in packet data for each base that is a house, building, etc. in the residential area subject to crime prevention management. A transceiver is provided that performs an operation, a receiving operation for receiving crime prevention disaster prevention information transmitted from another base, and a transfer transmission operation for further transferring the received crime prevention disaster prevention information to another base. When the transmitter / receiver detects interference of transmission / reception from a plurality of bases based on information constituting the crime prevention / disaster prevention information, the transmission / reception device invalidates the transmission / reception.

  The security / disaster prevention information includes a transmission source base ID number that is a base identification number uniquely given to the base in advance, and a transmission source base grant time stamp that is the time at which the security / disaster prevention information for the crime prevention / disaster event that occurred in the base is generated. And the number of times of transmission indicating the number of times the crime prevention disaster prevention information has been transferred, a crime prevention disaster prevention code that is a code indicating a crime prevention disaster prevention event, and a CRC calculation value.

  The crime prevention information transmitted by the spontaneous transmission operation is stored in the memory. In the spontaneous transmission operation and the transfer transmission operation, the transmitted crime prevention disaster prevention information is self-returned, and the CRC calculation values included in both the crime prevention disaster prevention information are compared. Also, in the reception operation, included in the received crime prevention disaster prevention information, the CRC calculation value obtained from the transmission source base ID number, the transmission source site grant time stamp, the number of transfers and the crime prevention disaster prevention code included in the received crime prevention disaster prevention information The calculated CRC values are compared, and if they do not match, interference is assumed.

  In the receiving operation, when the number of transfers exceeds the total number of bases in the residence area, when there is interference, or when the disaster prevention information is the same as the received crime prevention disaster prevention information (determined by the sender base ID number and the sender base grant time stamp) When stored in the memory, the received crime prevention information is discarded. In other cases, the received crime prevention information is stored in the memory.

  In the spontaneous transmission operation and the transfer transmission operation, when receiving from another base, or in the reception operation waiting for transmission from the local base, the built-in random number timer is activated and waits for a predetermined time.

  FIG. 1 shows a first embodiment of the area warning system of the present invention. In FIG. 1, seven bases 1 to 7 are shown in the residential area 30. A residential area means a residential area where houses are densely built, such as a downtown area, or a residential area where one or more buildings such as housing estates, condominiums, and high-rise buildings exist. . In addition, the base means each house in the above-mentioned residential area, a housing complex, a condominium, and a resident's house or office for each house in a high-rise building.

  Between each base 1-7, the crime prevention disaster prevention information 21 detected in the base is transmitted / received, and a base station is not required. The configurations of the bases 1 to 7 are the same, and FIG. 1 shows details of the configuration of the bases 7. The base 7 includes a transceiver 10.

  The transceiver 10 is a spontaneous transmission operation for transmitting information originating from crimes and disasters occurring at the site to other sites as crime prevention disaster prevention information, and a reception operation for receiving the crime prevention disaster prevention information transmitted from another site, A transfer transmission operation of transferring the received crime prevention disaster prevention information to another base is performed. Therefore, the transceiver 10 includes a receiving unit 11, a transmitting unit 12, a control unit 13, a ROM 14, a random number timer 15, a RAM memory unit 16, a security / disaster information display unit 17, a security / disaster sensor unit 18, an omnidirectional transmitting / receiving antenna unit. 19 and a clock 20.

  FIG. 2 shows information contents in the frame configuration of the crime prevention disaster prevention information 21. The crime prevention disaster prevention information 21 is generated by the control unit 13. The crime prevention disaster prevention information 21 forms one frame, and is composed of five types of information: a transmission source base ID number 22, a transmission source base grant time stamp 23, a transfer count 24, a crime prevention disaster prevention code 25, and a CRC calculation value 26. Yes.

  The transmission source base ID number 22 is a base identification number uniquely given to each base in advance, and the transmission source base grant time stamp 23 indicates the time when the crime prevention disaster prevention information 21 generated in the local base is generated. Represent.

  The transfer count 24 is a value indicating how many times the crime prevention disaster prevention information 21 has been transferred between the respective bases. The initial value is “1”, and is incremented by one at each base every time it is transferred without collision. Is done. The permissible maximum value of the transfer count 24 is the same as the total number of bases in the residential area, and if it exceeds this, the crime prevention disaster prevention information 21 is discarded and not transferred at any base received.

  The crime prevention disaster prevention code 25 is a code indicating a crime prevention disaster prevention event detected at a base where a crime or disaster has occurred. The CRC calculation value 26 is a CRC value calculated from these four types of data 22-25.

  Referring again to FIG. 1, the crime prevention / disaster sensor unit 18 detects crimes and disasters that have occurred in its own base 7 and converts them into crime prevention / disaster codes 25. For example, detection of illegal intruders, detection of fire occurrence, detection of infectious diseases, detection of poisonous gases, detection of flammable materials leakage, and the like are performed, and these detection signals are converted into predetermined crime prevention / disaster prevention codes 25.

  The clock 20 is clocked, and is read from the control unit 13 in order to obtain time data for the transmission source base granting time stamp 23 when the crime prevention disaster prevention information 21 generated in the local base 7 is created.

  The receiving unit 11 is a receiver that wirelessly receives the crime prevention disaster prevention information 21 in the area to be alerted, and the transmission unit 12 is a transmitter that wirelessly transmits the crime prevention disaster prevention information 21 in the area to be alerted. In wireless communication, weak wireless power is used. However, since the bases are very close to each other, radio waves are radiated in a circle around the transmission base and can be transmitted to a plurality of surrounding bases. The omnidirectional transmitting / receiving antenna unit 19 is a omnidirectional antenna for wireless communication, and is connected to the receiving unit 11 and the transmitting unit 12.

  The ROM 14 stores a transmission source base ID number 22 (a constituent element of the crime prevention disaster prevention information 21) uniquely assigned to each base in advance, and the total number of bases in the residential area to be warned, a nonvolatile semiconductor memory, It consists of a magnetic disk.

  The RAM memory unit 16 includes a readable / writable semiconductor memory, a magnetic disk, and the like. The RAM memory unit 16 stores crime prevention / disaster information 21 generated at its own site, and also stores and stores crime prevention / disaster information 21 transferred from other sites.

  The random number timer 15 measures the waiting time until the crime prevention / disaster prevention information 21 transmitted from other bases is accumulated in the RAM memory unit 16 and then transferred. That is, the waiting time until transmission is measured for generating the timing of wireless transmission. The random number timer 15 is activated by the control unit 13 when the control unit 13 receives a radio signal or when a radio collision (interference) is detected. The control unit 13 receives the count-up completion signal of the random number timer 15.

  Here, the wireless collision will be described. The wireless collision is performed when the crime prevention disaster prevention information 21 is received from another base, when the crime prevention disaster prevention information 21 of the local base is transmitted, and to the next base where the crime prevention disaster prevention information 21 transferred from the other base has not yet been transferred. It can happen in each case when forwarding.

  The wireless collision at the time of reception is the CRC calculation result obtained by the control unit 13 by calculation from the transmission source base ID number 22 in the received crime prevention disaster prevention information 21, the transmission source base grant time stamp 23, the number of transfers 24, and the crime prevention disaster prevention code 25. And the comparison result in the control part 13 with the CRC calculation value 26 contained in this received crime prevention disaster prevention information 21 is a case where it does not correspond. At this time, it recognizes that two separate crime prevention disaster prevention information 21 issued by two or more bases are in a wireless collision.

  When transmitting the crime prevention disaster prevention information 21 of the own base, the wireless collision when transmitting the crime prevention disaster prevention information 21 derived from a crime or a disaster that occurred in the own base, and another crime prevention disaster prevention information 21 from another base This is the case of a collision. At this time, the crime prevention disaster prevention information 21 is transmitted at the same time from the own base, and the crime prevention disaster prevention information 21 is also received, and the control unit 13 compares the transmission content with the simultaneous reception content, and a radio collision occurs when they do not match. Recognize. The contents to be compared are the CRC calculation value 26 obtained for the crime prevention disaster prevention information 21 transmitted from the own base and the CRC calculation value 26 in the crime prevention disaster prevention information 21 received simultaneously at the time of transmission.

  The wireless collision at the time of transferring the crime prevention disaster prevention information 21 transferred from another base to the next base that has not yet been transferred is the same as the wireless collision at the time of transmitting the above-mentioned crime prevention disaster prevention information 21 of the own base.

  The security / disaster prevention information display unit 17 in FIG. 1 visually or acoustically displays the contents of the crime prevention / disaster prevention code 25 in the crime prevention / disaster prevention information 21 received from other bases to the residents in the base to promote crime prevention and disaster prevention actions. Let

  The control unit 13 which is the core part of the transceiver 10 is a computer to which a processing procedure is given in advance, and is a read-only memory composed of a semiconductor or the like that stores a program for executing processing as needed, program execution Built-in random access memory that can read and write the necessary computation data. Moreover, it is connected to the receiving unit 11, the transmitting unit 12, the ROM 14, the random number timer 15, the RAM memory unit 16, the crime prevention / disaster information display unit 17, the crime prevention / disaster sensor unit 18, the omnidirectional transmission / reception antenna unit 19 and the clock 20, and Necessary control, that is, transmission, reception, storage, storage, reading, calculation, etc. of electric signals is performed.

  Specifically, the control unit 13 generates the crime prevention disaster prevention information 21 based on the crime prevention disaster prevention code 25 issued from the crime prevention disaster prevention sensor unit 18 at its own base, and performs protocol processing by wireless communication. When the crime prevention disaster prevention information 21 is received via the receiving unit 11, the transmission source base ID number 22, the transmission source base granting time stamp 23, the transfer count 24, and the crime prevention disaster prevention code 25 included in the crime prevention disaster prevention information 21 are recognized. To do. And CRC calculation is performed from these four types of data, and it compares with the CRC calculation value 26 stored in the received crime prevention disaster prevention information 21. If the comparison results are different, a process is performed in which the data is discarded as incorrect data and the data is not transferred and transmitted to another base. The crime prevention / disaster information 21 generated at the local site is stored in the RAM memory unit 16.

Moreover, when the crime prevention disaster prevention information 21 from another base is received, the control part 13 reads the stored crime prevention disaster prevention information 21 from the RAM memory part 16, and performs the history confirmation with the crime prevention disaster prevention information 21 which transmitted / received. As a result, when there is the same content, it is recognized that the transfer processing has already been performed, and the received crime prevention disaster prevention information 21 is discarded. At this time, the transfer count 24 is not compared with the allowable maximum value. On the other hand, if the crime prevention / disaster information 21 has different contents, the crime prevention / disaster information 21 is stored in the RAM memory unit 16 and the crime prevention / disaster code 25 of the crime prevention / disaster information 21 is read and transmitted to the crime prevention / disaster information display unit 17. To do.
[Description of operation]
Next, with respect to the operation of the transceiver 10 configured as described above, the flowcharts of FIGS. 3, 4, and 5 showing the processing in the control unit 13 for each of spontaneous transmission, reception, and transfer transmission are shown. The description will be given with reference.
(1) Spontaneous transmission operation When the control unit 13 detects that the security / disaster prevention code 25 from the security / disaster prevention sensor unit 18 is to be monitored (step A1 in FIG. 3), the control unit 13 starts the spontaneous transmission operation, Disaster prevention information 21 is generated (step A2).

  That is, the control unit 13 reads an ID number uniquely given in advance for the local site from the ROM 14 and sets it as the transmission source site ID number 22, and reads the time from the clock 20 as the transmission source site time stamp 23. Next, the control unit 13 sets the transfer count 24 to “1”, obtains the CRC calculation value 26 from the transmission source base ID number 22, the transmission source base time stamp 23, the transfer count 24 and the crime prevention disaster prevention code 25, and stores it in the RAM memory unit 16. accumulate.

  Prior to the transmission of the crime prevention disaster prevention information 21, the control unit 13 confirms whether the reception unit 11 is not outputting reception data from another base (step A3). Data received from other bases can be determined by the transmission base ID number 22, and in this way, a wireless collision is avoided in advance. When the reception data from other bases is not output, the transmission base ID number 22, the transmission base time stamp 23, the transfer count 24, the security / disaster prevention code 25, and the CRC calculation value 26 are stored in one frame. 21 is output to the transmitter 12, and the transmitter 12 starts wireless transmission (step A4).

  At the same time, the control unit 13 performs self-return reception of the crime prevention disaster prevention information 21 from its own base at the reception unit 11 until the transmission is completed. Then, it is checked whether or not the CRC value obtained from the received data matches the CRC calculated value 26 stored in the RAM memory unit 16 (step A5). As a result, if the CRC values match (YES in step A5), it is determined that no wireless collision has occurred, the above-described crime prevention / disaster information 21 is stored in the RAM memory 16, and the transmission ends (step A7).

  In the above processing, if the receiving unit 11 outputs received data from another base (YES in step A3), or if the CRC value does not match (NO in step A5), a radio collision has occurred. Is determined, the reception operation is started, and transmission by the random number timer operation is awaited (step A6). As a result, the transmission operation is invalidated. The data that has been transmitted (step A4) does not match the CRC value, and is discarded in the reception operation described below.

  During this time, the control unit 13 activates the random number timer 15 and waits for a count-up signal from the random number timer 15. The standby is random time. When the control unit 13 detects the count-up signal of the random number timer 15, it confirms again that the receiving unit 11 does not output the received data from other bases (step A3). move on.

  Thus, even if the control unit 13 detects the count-up signal of the random number timer 15 (step A6), if the reception unit 11 outputs the reception data from another base (YES in step A3), it is again Then, the random number timer 15 is activated and waits for the count up (step A6).

  The wireless collision avoidance operation in step A3 to step A6 is repeated until the receiving unit 11 does not output the reception data from other bases, and when it can be transmitted (NO in step A3), the crime prevention information 21 having the same contents again. Is wirelessly transmitted (step A4). Also for this wireless transmission, the CRC calculation value calculated from the crime prevention disaster prevention information 21 received by self-return and the CRC calculation value 26 are checked for consistency (step A5). Is repeated.

In the above operation, the self-returned (step A3) data is not stored in the RAM memory unit 16. Reception has priority over transmission. Therefore, when the random number timer 15 is in operation while waiting for transmission (step A7), when reception data from another base is output from the reception unit 11 to the control unit 13, transmission is performed until all reception data is received. Do not start.
(2) Reception Operation The crime prevention / disaster information 21 from another base station wirelessly received by the omnidirectional transmission / reception antenna unit 19 is demodulated by the reception unit 11 and sent to the control unit 13. Recognition that it is the crime prevention disaster prevention information 21 from another base is determined by having received it in a state where it is not transmitted from its own base.

  At this time, the control unit 13 confirms whether there is a transmission waiting from its own base (step B1 in FIG. 4), and if there is a transmission waiting, waits for transmission by a random number timer operation (step B2), and then Proceed with the process. In this process, three checks are performed to determine whether or not the received crime prevention disaster prevention information 21 should be discarded, and the remaining crime prevention disaster prevention information 21 is stored in the RAM memory unit 16 (step B7).

  First, if the value of the number of transfers 24 in the received crime prevention disaster prevention information 21 exceeds the total number of bases in the residential area 30 stored in the ROM 14 in advance (YES in step B3), discard without accumulation. (Step B6). With this function, even if a failure such as a part of the past crime prevention disaster prevention information 21 stored in the RAM memory section 16 is rewritten, the crime prevention disaster prevention information 21 is transferred endlessly because it is always discarded. This can be prevented.

  Next, in the case of NO in step B3, a CRC value is calculated from the values of the transmission source base ID number 22, the transmission source base granting time stamp 23, the transfer count 24 and the security prevention code 25 in the received crime prevention disaster prevention information 21, The value and the CRC calculation value 26 included in the received crime prevention disaster prevention information 21 are compared, and if they are different (NO in step B4), they are discarded (step B6). As a result, the reception operation is invalidated. This is because such crime prevention and disaster prevention information 21 has been transmitted wirelessly despite a transmission collision occurring on the transmission side.

  Finally, if there is the crime prevention disaster prevention information 21 already stored in the RAM memory unit 16 (from another base or own base), it is compared with the received crime prevention disaster prevention information 21 (step B5). As a result, the transmission source base ID number 22 and the transmission source grant time stamp 23 included in the received crime prevention disaster prevention information 21 are the transmission source base ID number 22 and the transmission source grant time stamp 23 of the crime prevention disaster prevention information 21 already stored. (YES in step B5), the security / disaster prevention information 21 received this time is the security / disaster prevention information 21 that has been transmitted spontaneously in the past or the crime prevention / disaster information 21 from other bases, and the transmission / transmission measures in the past Is determined, and discarded without being stored in the RAM memory unit 16 (step B6).

As a result of the comparison in step B5, if the same data is not stored and the CRC calculation value 26 matches, the received crime prevention information 21 is stored in the RAM memory unit 16 (step B7), and the transfer transmission described in (3) Depending on the operation, it is always transferred only once. Moreover, the crime prevention disaster prevention code 25 of the newly stored crime prevention disaster prevention information 21 is read and displayed on the crime prevention disaster prevention information display unit 17 (step B8), and the crime prevention disaster prevention is visually or acoustically notified to the residents in the base. Communicate data to encourage crime prevention and disaster prevention actions.
(3) Transfer transmission operation The control part 13 reads the crime prevention disaster prevention information 21 normally received and stored in the RAM memory part 16 (step C1 in FIG. 5), and the reception part 11 does not output the reception data from other bases. (Step C2), if the reception unit 11 does not output the reception data from other bases, the crime prevention / disaster information 21 is output to the transmission unit 12 and wirelessly transmitted from the omnidirectional transmission / reception antenna unit 19 (Step C3). At this time, “1” is added to the transfer count 24, the CRC calculation value 26 is obtained with the changed value, and the crime prevention disaster prevention information 21 having the CRC calculation value 26 is transmitted.

  When the wireless transmission is started, the control unit 13 performs the self-return reception of the crime prevention disaster prevention information 21 from the local site received by the receiving unit 11 until the transmission is completed, and the CRC calculation value 26 obtained from the received data is the above-mentioned new value. It is checked whether or not it matches the CRC calculation value 26 (step C4). As a result, if the CRC values match (YES in step C4), it is determined that no radio collision has occurred, and the process ends.

  In the above processing, when the receiving unit 11 outputs received data from another base (YES in Step C2), or when the CRC value obtained from the received data does not match the new CRC calculated value 26 (Step When NO in C4), the receiving operation is started and transmission is awaited by the random number timer operation (step C5). As a result, the transfer transmission operation is invalidated.

  During this time, the control unit 13 activates the random number timer 15 and waits for a count-up signal from the random number timer 15. The standby is random time. When the control unit 13 detects the count-up signal of the random number timer 15, it confirms again that the receiving unit 11 is not outputting the received data from other bases (step C2). move on.

  Thus, even if the control unit 13 detects the count-up signal of the random number timer 15 (step C5), if the reception unit 11 outputs the reception data from another base (YES in step C2), the control unit 13 again. Then, the random number timer 15 is activated and waits for the count-up (step C5).

  The wireless collision avoidance operation in steps C2 to C5 is repeated until the receiving unit 11 does not output data received from another base, and when transmission is possible (NO in step C2), the crime prevention disaster prevention information 21 having the same contents again. Is wirelessly transmitted (step C3). Also for this wireless transmission, self-return reception and CRC value check are performed (step C4), and steps C2 to C5 are repeated according to the result.

  In the above operation, the self-returned received data (step C4) is not stored in the RAM memory unit 16. Reception has priority over transmission. Accordingly, when the random number timer 15 is in operation while waiting for transmission (step C5), when reception data from another base is output from the reception unit 11 to the control unit 13, transmission is performed until all reception data is received. Do not start.

As described above, wireless collision avoidance operation can be performed, and correct data can be transferred and transmitted.
(Propagation behavior of crime prevention disaster prevention information 21 in the residential area model)
Next, a model of a residential area in which bases equipped with the transmitter / receiver 10 that performs the above-described spontaneous transmission operation, reception operation, and transfer transmission operation are set, and the crime prevention information 21 is propagated in the residential area. This will be explained in time series. Here, it is assumed that crime disaster information occurring in the residential area is notified all at once and prompts the residents in the residential area to immediately take crime prevention and disaster prevention actions.

  FIG. 6 shows a residential area 30 in which 25 bases 31 to 55 for the purpose of crime prevention are scattered. Each of the bases 31 to 55 includes a transceiver 10.

  First, assume that a certain crime prevention disaster prevention event occurs at the base 31. The control unit 13 detects an alarm issued by the security / disaster prevention sensor unit 18 of the transceiver 10 in the base 31. As described above, the control unit 13 collects the transmission source base ID number 22, the transmission source base grant time stamp 23, the transfer count 24, and the crime prevention disaster prevention code 25 created based on the above-described alarm, and calculates the CRC calculated value 26. Is organized as crime prevention disaster prevention information 21.

  At the stage when the crime prevention disaster prevention information 21 transmitted from the base 31 is organized, the control unit 13 confirms whether the crime prevention disaster prevention information 21 from another base has not been received. If it is received, the random number timer 15 is activated to avoid a wireless collision, and waits for a timer count-up signal.

  After detecting the count-up signal, the control unit 13 confirms again whether the crime prevention / disaster information 21 from another base has been received. If it is not received, it is assumed that there is no radio collision, and the already organized crime prevention information 21 is wirelessly transmitted as packet data.

  When the transmission is started, the control unit 13 receives the crime prevention / disaster information 21 from the local site received by the reception unit 11 until the transmission is completed, and the CRC value obtained from the received data is stored in the RAM memory unit 16. It is calculated whether or not it matches the CRC calculation value 26, and if it matches, the transmission is stopped and the crime prevention / disaster information 21 is stored in the RAM memory unit 16. If they do not match, start the random number timer 15 after transmitting the crime prevention disaster prevention information 21, wait for a random time, assuming that a wireless collision has occurred, confirm that nothing has been received again, and then again the crime prevention disaster prevention information 21 with the same contents. Send. When the CRC calculation value 26 matches, it is stored in the RAM memory unit 16 as described above. At this time, the self-returned data is not stored in the RAM memory unit 16.

  As shown in FIG. 6, the crime prevention disaster prevention information 21 transmitted from the base 31 is transmitted from the non-directional transmission / reception antenna unit 19 and reaches the radio wave reach 60 at time t0. The radio wave reachable range 60 is a range in which a radio wave radiated with weak wireless power by the omnidirectional transmitting / receiving antenna unit 19 propagates in a circle around the transmission base and can reach a plurality of surrounding bases without fail. Each base is controlled to have a high reception threshold so as to receive only packet data from adjacent bases.

  In FIG. 6, there are four bases (bases 32, 34, 37, 51) in addition to the base 31 in the radio wave reach 60, and the CRC calculation of the crime prevention / disaster prevention information 21 received at each base is performed, and the received packet data Are compared with the CRC calculation value 26 included in the data, and only the correct one is stored in the RAM memory unit 16.

  In FIG. 7 showing the case of transition from time t0 to time t1, since the random number timer 15 in the transceiver 10 of the base 32 has counted up the earliest among the four bases, the transfer transmission operation of the received packet is started. The situation where it is transmitting to a new radio wave reachable range 61 is shown. In the radio wave reach 61, there are five bases (bases 31, 33, 39, 46, 51) in addition to the base 32.

  However, the base 31 in the radio wave reach 61 is the base that became the transmission source at the time t0, and even if the packet data transmitted at the current time t1 is received again, the packet data has already been transmitted. Discard without storing in the memory unit 16. Also, at the base 51, the packet data transmitted at the current time t1 matches the packet data transmitted and received from the base 31 at the time t0 and stored in the RAM memory unit 16, so that the data is stored in the RAM memory unit 16. Discard without storing.

  In FIG. 8 showing a case where the transition is from time t1 to time t2, the base 33 in the radio wave arrival range 61 at time t1 and the base 34 in the radio wave arrival range 60 at time t0 reach the count up of the random number timer 15 at the same time. Therefore, the transfer transmission operation of the received packet is started, and two new radio wave arrival ranges 62 and 63 are formed. In addition to the base 33, there are four bases (bases 32, 35, 39, 49) in the radio wave reach 62, and in the radio wave reach 63, there are five bases (bases 31, 36, 37, 43, 50) exists.

  However, the base 32 in the radio wave reach 62 is the base that became the transmission source at the time t1, and even if the packet data transmitted at the current time t2 is received again, the packet data has already been transmitted. Discard without storing in the memory unit 16. Also, at the base 39, the packet data transmitted at this time t2 matches the packet data transmitted and received from the base 32 at time t1 and stored in the RAM memory unit 16. Discard without storing.

  Similarly, the base 31 in the radio wave reach 63 is the base that became the transmission source at time t0, and even if the packet data transmitted at this time t2 is received again, this packet data has already been transmitted. It is discarded without being stored in the RAM memory unit 16. Also, at the base 37, the packet data transmitted at the current time t2 coincides with the packet data transmitted and received from the base 31 at the time t0 and stored in the RAM memory section 16, so that the RAM memory section 16 receives the packet data. Discard without storing.

  In FIG. 9 showing a case where the transition is from time t2 to time t3, the base 35 in the radio wave arrival range 62 at time t2 and the base 36 in the radio wave arrival range 63 at time t2 reach the count up of the random number timer 15 at the same time. Therefore, the transfer transmission operation of the received packet is started, and two new radio wave arrival ranges 64 and 65 are formed. In addition to the base 35, there are four bases (bases 33, 39, 44, 49) in the radio wave reach 64, and the radio wave reach 65 has five bases (bases 34, 38, 40, 45, 50) in addition to the base 36. ) Exists.

  However, the base 33 in the radio wave reach 64 is the base that became the transmission source at the time t2, and even if the packet data transmitted at the current time t3 is received again, the packet data has already been transmitted. Discard without storing in the memory unit 16. Further, the base 39 matches the packet data transmitted and received from the base 32 at the time t1 and the base 33 at the time 49 at the time t2 and received and stored in the RAM memory unit 16, so that it is not stored in the RAM memory unit 16. Discard.

  Similarly, the base 34 in the radio wave reach 65 is the base that became the transmission source at time t2, and even if the packet data transmitted at time t3 is received again, the packet data has already been transmitted. It is discarded without being stored in the RAM memory unit 16. Further, the packet data transmitted at time t3 also at the base 50 matches the packet data transmitted and received from the base 34 at time t2 and stored in the RAM memory section 16, so that it is stored in the RAM memory section 16. Throw away.

  In FIG. 10, which shows a case where the transition is from time t3 to time t4, the base 37 in the radio wave arrival range 63 at time t2, the base 38 in the radio wave arrival range 65 at time t3, and the base 46 in the radio wave arrival range 61 at time t1. Since the random number timer 15 has started counting up at the same time, the transfer transmission operation of the received packet is started, and three new radio wave arrival ranges 66, 67, 68 are formed. There are five bases (bases 31, 34, 43, 47, 52) in addition to the base 37 in the radio wave reach 66, and five bases (bases 36, 45, 48, 54, 55) exist, and in the radio wave reach 68, there are four bases (bases 32, 39, 42, 51) in addition to the base 46.

  However, the base 31 in the radio wave reach 66 is the base that was the source at time t0 and the base 34 was the source at time t2, and even if the packet data transmitted at this time t4 is received again, this packet data is Since it has already been transmitted, it is discarded without being stored in the RAM memory unit 16. Further, the base 43 matches the packet data transmitted and received from the base 34 at time t 2 and stored in the RAM memory unit 16, and is discarded without being stored in the RAM memory unit 16.

  Similarly, the base 36 in the radio wave reach 67 is the base that became the transmission source at the time t3, and even if the packet data transmitted at the current time t4 is received again, the packet data has already been transmitted. It is discarded without being stored in the RAM memory unit 16. Further, the base 45 matches the packet data transmitted and received from the base 36 at time t3 and stored in the RAM memory unit 16, and is therefore not stored in the RAM memory unit 16 but discarded.

  Similarly, the base 32 in the radio wave reach 68 is the base that became the transmission source at time t1, and even if the packet data transmitted at time t4 is received again, the packet data has already been transmitted. It is discarded without being stored in the RAM memory unit 16. Further, since the base 39 and the base 46 match the packet data transmitted and received from the base 32 at the time t1 and the base 31 at the time 51 at the time t1 and stored in the RAM memory unit 16, the RAM memory unit 16 Discard without storing.

  In FIG. 11, which shows a case where the transition is from time t4 to time t5, the base 39 in the radio wave arrival range 61 at time t1, the base 40 in the radio wave arrival range 65 at time t3, and the base 47 in the radio wave arrival range 66 at time t4. Since the base 55 in the radio wave arrival range 67 at the time t4 reaches the count of the random number timer 15 at the same time, the transfer transmission operation of the received packet is started, and four new radio wave arrival ranges 69, 6A, 6B are started. , 6C is formed. In addition to the base 39, there are four bases (bases 32, 33, 35, 46) in the radio wave reach 69, and in the radio wave reach 6A, there are three bases (bases 36, 45, 50) in addition to the base 40. In addition, there are three bases (bases 37, 41, 52) in addition to the base 47 in the radio wave reachable range 6B, and five bases (bases 38, 42, 48, 53, 54) exists.

  However, the base 32 in the radio wave reach 69 is the base originating at time t1, and the base 33 is the base that originated at time t2. Even if the packet data transmitted at this time t5 is received again, this packet data is Since it has already been transmitted, it is discarded without being stored in the RAM memory unit 16. Further, the base 35 matches the packet data transmitted and received from the base 33 at the time t2 and the base 32 at the time t1 from the base 32 at the time t2 and stored in the RAM memory unit 16, and therefore stored in the RAM memory unit 16. Throw away.

  Similarly, the base 36 in the radio wave reach 6A is the base that became the transmission source at time t3, and even if the packet data transmitted at this time t5 is received again, the packet data has already been transmitted. It is discarded without being stored in the RAM memory unit 16. Further, the base 50 matches the packet data transmitted and received from the base 34 at the time t 2 and the base 45 from the base 36 at the time t 3 and stored in the RAM memory unit 16. Throw away.

  Similarly, the base 37 in the radio wave reach 6B matches the packet data transmitted and received from the base 31 at the time t0, and the base 47 and the base 52 from the base 37 at the time t4 and stored in the RAM memory unit 16, respectively. Therefore, it is discarded without being stored in the RAM memory unit 16.

  Similarly, the base 38 in the radio wave reach 6C is transmitted from the base 36 at time t3, the base 42 is transmitted from the base 46 at time t4, the base 48 is transmitted from the base 38 at time t4, and the base 54 is transmitted from the base 38 at time t4. Since it matches the packet data received and stored in the RAM memory unit 16, it is discarded without being stored in the RAM memory unit 16.

  As described in detail above, packet data transmission operations are performed one after another over time, and all the bases in the residential area 30 will transmit once, and when this is completed, A series of transmission / reception operations are completed.

  When storing the crime prevention disaster prevention information 21 in the RAM memory unit 16 at the time of spontaneous transmission or reception, if there is no space in the memory area, the packet data that is newly received normally and does not match the already stored packet data Is stored in such a manner that the content of the transmission source base time stamp 23 in the already stored packet data is selected from the oldest in the memory and overwritten in order.

As described above, in the present invention, since wireless is used, laying work such as a wired network is unnecessary. In addition, operation that does not depend on the size of the residential area 30 is possible, and further, a base station and a relay station that are necessary in the conventional system are not necessary, so that there is an effect of cost reduction.
[Example 2]
FIG. 12 shows Example 2 of the area warning system according to the present invention. In this example, information on criminal disasters that occurred in the residential area that is being watched will be notified all at once, and crime prevention and disaster prevention actions will be promptly promoted to residents in the residential area. It is characterized by making immediate notifications to public institutions and taking prompt organizational measures.

  In this embodiment, two monitoring devices 100 and 101, two concentrators 102 and 103, and a security / disaster prevention center 104 are provided in the residential area 30 as compared to the first embodiment shown in FIG. Aside from the public and private operations of the Crime Prevention Center 104, it is an organizational base that collects and analyzes crime prevention information, and manages crime prevention and disaster prevention activities and incidents in the jurisdiction. It is the information communication system in an organization.

  Each of the monitoring devices 100 and 101 is installed at an important outdoor location such as a street corner of the residential area 30 and is connected to an imaging device that records criminal disaster information as acoustic information, still images, moving images, and the like. The contents recorded by the imaging device can be reported to the crime prevention center 104 using a wired or wireless communication network 105.

  Each of the aggregators 102 and 103 is installed at an important outdoor location such as a street corner of the residential area 30 and has a transmitter for transmitting the crime prevention disaster prevention information 21 received from the base to the crime prevention and disaster prevention center 104 via a wired 105 or a wireless communication network. It is connected. Thereby, the crime prevention disaster prevention information 21 can be reported directly to the crime prevention disaster prevention center 104.

  The monitoring device 100 or the monitoring device 101 installed in a different place in the residential area 30 detects a crime disaster that has occurred in that place, or receives the crime prevention disaster prevention information 21 transmitted from another base in the residential area 30 In response to the detection of the crime prevention / disaster prevention code 25 in the packet data, the imaging device incorporated in each monitoring device is activated. The imaging device automatically records information that can be used to solve criminal disaster cases, such as traffic monitoring in important traffic networks, vehicle records, and records of the appearance of mobile personnel in the area of residence. The monitoring devices 100 and 101 can report the crime disaster information to the crime prevention and disaster prevention center 104 via the wired 105 or the wireless communication network. Moreover, it becomes possible to obtain the deterrent effect which suppresses the illegal act by the malicious third party in advance by posting the crime disaster information in the entire residential area.

  Similarly, when a plurality of aggregators 102, 103, etc. are provided in the residential area, the crime prevention information 21 generated in the residential area 30 is automatically and quickly transmitted through the aggregator 102 or the aggregator 103 installed in different places. It is possible to report to the crime prevention disaster prevention center 104. Even in this result, the effect of deterring illegal activities can be applied to the entire residential area 30 in the same manner as described above by promptly informing the execution of illegal activities by a malicious third party or by posting illegal control inside and outside the residential area 30. Can be affected.

The figure which shows the structure of Example 1 of the area warning system which concerns on this invention. The information content in the frame composition of crime prevention disaster prevention information 21 in the present invention is shown. The flowchart which shows the spontaneous transmission operation | movement of this transmitter / receiver 10 in this invention. The flowchart which shows reception operation | movement of this transmitter / receiver 10 in this invention. The flowchart which shows the transfer transmission operation | movement of this transmitter / receiver 10 in this invention. Explanatory drawing of the reach at time t0 of the crime prevention disaster prevention information 21 transmitted from the base 31 Explanatory drawing of the reach | attainment in the time t1 of the crime prevention disaster prevention information 21 transmitted from the base 32 of FIG. Explanatory drawing of the reach | attainment range in the time t2 of the crime prevention disaster prevention information 21 transmitted from the base 33 and the base 34 of FIG. Explanatory drawing of the reach | attainment range at the time t3 of the crime prevention disaster prevention information 21 transmitted from the base 35 and the base 36 of FIG. Explanatory drawing of the reach | attainment range at the time t4 of the crime prevention disaster prevention information 21 transmitted from the base 37, the base 38, and the base 46 of FIG. Explanatory drawing of the reach | attainment range at the time t5 of the crime prevention disaster prevention information 21 transmitted from the base 39, the base 40, the base 47, and the base 55 in FIG. The figure which shows the structure of Example 2 of the area warning system which concerns on this invention. Block diagram of conventional regional disaster prevention radio system

Explanation of symbols

1 to 7 bases 10 transceiver 11 receiving unit 12 transmitting unit 13 control unit 14 ROM
DESCRIPTION OF SYMBOLS 15 Random number timer 16 RAM memory part 17 Security / disaster prevention data display part 18 Security / disaster prevention sensor part 19 Omnidirectional transmission / reception antenna part 20 Clock 21 Security / disaster prevention information 22 Source base ID number 23 Source base grant time stamp 24 Number of transfers 25 Crime prevention Code 26 CRC calculation value 30 Living area 31-55 Base 60-6C Radio wave reach
100, 101 Monitor
102, 103 Aggregator
104 Crime Prevention Center
105 Wired

Claims (6)

For each base that is a house, building, etc. in the residential area subject to crime prevention management,
Spontaneous transmission operation to transmit information on crime disaster events that occurred at the site as crime prevention disaster prevention information in packet data, reception operation to receive the crime prevention disaster prevention information transmitted from other sites, and the received crime prevention disaster prevention information further to other sites A transmitter / receiver that performs transfer transmission operation
When the transmitter / receiver detects transmission / reception interference from a plurality of bases based on the information constituting the crime prevention / disaster prevention information, the transmitter / receiver invalidates the transmission / reception. The crime prevention information
A source base ID number which is a base identification number uniquely given to the base in advance,
The sender base grant time stamp, which is the time when the crime prevention disaster prevention information for the crime prevention disaster occurrence that occurred in the base was generated,
The number of transfers showing the number of times the crime prevention information has been transferred,
Crime prevention disaster prevention code which is a code indicating a crime prevention disaster prevention event,
The area warning system according to claim 1, comprising a CRC calculation value. In the spontaneous transmission operation and the transfer transmission operation, the transmitted crime prevention disaster prevention information is received back, the CRC calculation values included in both the crime prevention disaster prevention information are compared, and when they do not match, the interference is set. The area warning system according to claim 2. In the reception operation, the transmission source base ID number, the transmission source base grant time stamp, the number of transfers and the CRC calculation value obtained from the crime prevention disaster prevention code included in the received crime prevention disaster prevention information and the received crime prevention disaster prevention information are included. 4. The regional warning system according to claim 2, wherein when there is no coincidence between the calculated CRC values, the interference is set as the interference. 5. In the reception operation, when the number of transfers exceeds the total number of bases in the residence area, the interference, or the same crime prevention / disaster information received (determined by the source base ID number and the source base grant time stamp) 5. The security / disaster prevention information received is discarded when the security / disaster prevention information has been stored in the memory; otherwise, the received security / disaster information is stored in the memory. Regional warning system as described in any one. In the spontaneous transmission operation and the forward transmission operation, when receiving from another base, in the reception operation, when waiting for transmission from the local base, a built-in random number timer is activated and waits for a predetermined time. The regional alert system according to any one of claims 1 to 5.

Images