JP4820797B2 - Control method of local security system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve a system operation with flexibility and expansivity by optionally increasing the number of all slave units while securing stability and reliability without decreasing the original function of a regional crime prevention system. <P>SOLUTION: When prescribed regulation start conditions set based on the reception of data from at least certain number Nx of slave units 2 and so on by an optional relay unit 3 or master unit 4 are satisfied, a regulation mode is executed instead of a normal mode, and when preset prescribed regulation release conditions are satisfied, the regulation mode is released. In the regulation mode, prescribed regulation signals (Cc.... Ccs) indicating that the regulation mode is set are transmitted with prescribed time intervals Tc from the relay unit 3 or the master unit 4 satisfying the regulation start conditions, and when receiving the regulation signals (Cc.... Ccs), the slave units 2 and so on switch the mode to a transmission stop mode to stop transmission, and releases the transmission stop mode based on the release of the regulation mode. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a method for controlling a local crime prevention system suitable for use in securing crime prevention for children who are going to and from school by using an ad hoc network system.

  Recently, the number of incidents such as kidnapping by suspicious children has been increasing, and it has become an important issue how to ensure the safety of children. It has been requested.

Conventionally, a local crime prevention system disclosed in Patent Document 1 is known as a system corresponding to such a request. The local security system includes a name tag with a wireless tag having a wireless tag storing a unique tag ID, a monitoring device arranged in a predetermined area, and a plurality of monitoring devices arranged with a child or a child as a confirmation target Constitutes a local security system that confirms the location of the person to be confirmed who has the name tag with the wireless tag by the management device connected via the network, and in particular, the wireless tag of the name tag with the wireless tag An ad hoc communication unit that performs ad hoc communication with a name tag with a wireless tag, and a power supply unit are further provided, and the monitoring device transmits a radio wave of a predetermined intensity to the surroundings, and receives a tag ID transmitted by the wireless tag in response thereto The wireless transmission / reception unit and a tag ID communication unit that notifies the management device via the network of the tag ID received at a predetermined timing. The tag ID acquisition unit that communicates with the predetermined monitoring device to acquire the tag ID, and compares the tag ID of the verification target person registered in the predetermined storage unit with the received tag ID, and the location of the verification target person The wireless tag of the name tag with the wireless tag is configured to communicate through one or more other wireless tags by ad hoc communication when communicating with the wireless transmission / reception unit of the monitoring device. It is a thing.
JP 2007-42009 A

  By the way, in a conventional local security system using an ad hoc network system, carrier sense is usually executed at the time of calling a child device, and the presence or absence of another carrier is confirmed. Then, when there is no other carrier, transmission is executed after a random waiting time generated by a random number, thereby avoiding the occurrence of collision between a plurality of waiting slave units. In this case, if the slave units are in a hidden relationship, the carriers of each other are not visible, and thus collisions are allowed. However, if the slave units are in an exposed relationship, the collision is not generated or is not generated. However, it is a negligible number of times.

  However, in a situation where the number of slave units increases, specifically, in the vicinity of the master unit where the slave units gather, the collision between the slave units and the repeater tends to increase even if the slave units are exposed to each other. This increase in collision leads to an increase in the number of discarded packets (discard rate), and further to a decrease in the stability and reliability of the local security system. Therefore, in the existing local crime prevention system, there is a limit to increasing the number of slave units, and there is a problem to be solved that a flexible and expansive system operation cannot be performed.

  An object of the present invention is to provide a control method of a local crime prevention system that solves the problems existing in the background art.

  In order to solve the above-described problem, the regional crime prevention system control method according to the present invention includes a wireless communication unit 2t provided with a wireless ID tag, and a plurality of crime prevention target persons H can be carried by each. A plurality of repeaters 3 and an ad hoc communication unit 4t each having a slave unit 2 and an ad hoc communication unit 3t provided with a wireless ID tag and installed at a plurality of different predetermined locations in a predetermined area Ac. In the local crime prevention system 1 including at least one parent device 4 and a server computer 6 connected to the parent device 4, any repeater 3 or the parent device 4 receives from a certain number Nx or more of the child devices 2 ... If the predetermined restriction start condition set based on the above is satisfied, the restriction mode is executed instead of the normal mode, and if the predetermined restriction release condition set in advance is satisfied, the restriction mode is released. In addition, in the restriction mode, a predetermined restriction signal (Cc..., Ccs) indicating the restriction mode is transmitted from the repeater 3 or the master unit 4 that satisfies the restriction start condition at a predetermined time interval Tc. The slave units 2... Are characterized by switching to a transmission suspension mode in which transmission is suspended when a restriction signal (Cc... Ccs) is received and canceling the transmission suspension mode based on the release of the restriction mode. .

  In this case, according to a preferred aspect of the invention, in the normal mode, the slave units 2... Can transmit the periodic notification signal Dt at least at regular intervals of Tt. On the other hand, any repeater 3 or base unit 4 counts the number of periodic notification signals Dt... Received from the slave units 2... Within a predetermined time Tw, and the counted number of receptions Nr is equal to or greater than a preset number of times Nrs. It is possible to switch to the restriction mode as a restriction start condition. At this time, after switching to the restriction mode, the restriction mode can be canceled with the restriction release condition that the fixed period Te has elapsed. On the other hand, any repeater 3 or master unit 4 is fixed in the restriction mode in advance based on the possibility of receiving from a certain number Nx or more of the slave units 2 ..., and the repeater 3 in which the slave unit 2 is fixed in the restriction mode. Alternatively, the restriction mode can be executed using the entry into the predetermined communication area Ki of the parent device 4 as a restriction start condition. At this time, the restriction mode can be canceled with the restriction release condition that the slave unit 2 exits from the predetermined communication area Ko of the repeater 3 or the base unit 4 fixed in the restriction mode. In addition, the local crime prevention system 1 which concerns on this invention can be applied to a school attendance area at least as the area Ac.

  According to the control method of the local crime prevention system 1 according to the present invention by such a method, the following remarkable effects are achieved.

  (1) A restriction mode is provided. In this restriction mode, a predetermined restriction signal (Cc..., Ccs) indicating the restriction mode is transmitted from the repeater 3 or the master unit 4 that satisfies the restriction start condition at a predetermined time interval. On the other hand, if the slave unit 2 receives a restriction signal (Cc..., Ccs), it switches to a transmission pause mode that pauses transmission and cancels the transmission pause mode based on the release of the restriction mode. Therefore, the total number of the slave units 2 can be arbitrarily increased while ensuring stability and reliability without deteriorating the original function of the local security system 1. Therefore, a flexible and expansive system operation is possible, and it is optimally applied especially to a school area.

  (2) According to a preferred embodiment, the arbitrary number of repeaters 3 or base unit 4 counts the number of periodic notification signals Dt... Received from slave units 2. If it is switched to the restriction mode as a restriction start condition that the set number of times Nrs or more is satisfied, at least any repeater 3 or base unit 4 can be switched to the restriction mode. For example, an elementary school event (excursion or It is possible to respond flexibly and accurately even when the slaves 2... Are temporarily concentrated in a predetermined area during a social tour or the like. Therefore, optimization can be achieved in securing the stability and reliability of the local crime prevention system 1.

  (3) According to a preferred aspect, after switching to the restriction mode, if the restriction mode is canceled with the elapse of a certain period Te as a restriction release condition, the normal mode when switching from the normal mode to the restriction mode is established. Can be reliably and accurately performed.

  (4) According to a preferred embodiment, an arbitrary repeater 3 or base unit 4 is fixed in the restriction mode in advance based on the possibility of receiving from a certain number Nx or more of the slave units 2... If the restriction start condition is that the child device 2 enters the predetermined communication area Ki of the repeater 3 or the parent device 4, for example, the parent device 4 installed in the elementary school has a certain number Nx at least during a predetermined time. Since there is a high possibility of receiving from the above slave units 2..., The master unit 4 can be fixed in the restriction mode in advance. Therefore, since monitoring and control for switching to or canceling the restriction mode are not necessary, it is possible to simplify the control of the local security system 1 while ensuring the stability and reliability of the local security system 1.

  (5) According to a preferred aspect, if the restriction mode is canceled as a restriction release condition that the slave unit 2 exits from the predetermined communication area Ko of any repeater 3 or the master unit 4 fixed in the restriction mode, Even when any repeater 3 or the master unit 4 fixed in the restriction mode is installed, the transition to the normal mode can be performed reliably and accurately by leaving the optional repeater 3 or the master unit 4. It can be carried out.

  Next, the best embodiment according to the present invention will be given and described in detail with reference to the drawings.

  First, in order to facilitate understanding of the control method of the local security system 1 according to the present embodiment, an overview of the entire local security system 1 will be described with reference to FIGS.

  First, the overall system configuration (system system) in the local security system 1 will be described. FIG. 4 shows the entire system of the system 1. Ac is a predetermined area to which the regional security system 1 is applied, and an example shows a school attendance area for elementary school students, and H ... indicates a child (crime prevention target person) attending school along the school route R. C ... is a school bag that the child H ... bears, and FIG. 5 (a) shows the school bag C in an enlarged manner. As shown in FIG. 5 (a), a child device case 11 that is waterproof is suspended from the side surface Cs of the school bag C, and a portable child device (terminal) 2 is accommodated in the child device case 11. To do. As shown in FIG. 5 (b), the slave unit 2 has a flat housing 12 formed in a rectangular shape. On the surface of the housing 12, an emergency button 13 and a battery housing portion covered by a cover 14 are provided. Have. Furthermore, an electric circuit 15 shown in FIG. 6A is accommodated in the housing 12. The electric circuit 15 of the slave unit 2 includes a microcomputer function unit including a CPU 16, a memory 17, and a processing program (program memory) Ps, and a battery 19. In addition, the emergency button 13 and the vibration sensor 20 described above are connected to the CPU 16 and a wireless communication unit 2t provided with a wireless ID tag is connected. Reference numeral 21 denotes a transmission / reception antenna which is built in the upper end of the housing 12 described above.

  On the other hand, repeaters 3 are respectively installed at a plurality of different predetermined locations in the area (school area) Ac, that is, at a plurality of different locations in the middle of the school route R. The repeaters 3... Select a position with a ground height of 4 to 5 [m] facing the school route R. FIG. 5C shows a case where the lower part of the support stay 31 is fixed to the upper part of the pole Mp of the curve mirror M via the fixing brackets 30 and the repeater 3 is attached to the upper end part of the support stay 31. FIG. 5 (c) shows the case where it is installed using the curve mirror M, but it can also be installed using various public objects such as utility poles and street lamps. The repeater 3 includes a waterproof repeater box 32, and a solar cell 33 and a transmission / reception antenna 34 are disposed on the upper end surface of the repeater box 32. Moreover, the electric circuit 35 is accommodated in the relay box 32 as shown in FIG. The electrical circuit 35 of the repeater 3 includes a microcomputer function unit including a CPU 36, a memory 37, and a processing program (program memory) Psr, and a secondary battery 39 connected to the CPU 36. The secondary battery 39 and the solar battery 33 are connected to the semiconductor switch 40. In this case, the power supply unit of the repeater 3 is configured by a charge / discharge circuit that uses the functions of the solar battery 33, the secondary battery 39, the semiconductor switch 40, and the CPU 36. Thereby, in this charging / discharging circuit, the voltage of the secondary battery 39 is monitored, and when the voltage exceeds a certain voltage, the charging is stopped, and when the voltage falls below the minimum operating voltage, the CPU 36 enters the standby mode. By shifting, overdischarge of the secondary battery 39 is prevented. Furthermore, an ad hoc communication unit 3t provided with a wireless ID tag is connected to the CPU 36.

  On the other hand, a single parent device 4 having an ad hoc communication unit 4t is installed in an elementary school where the child H goes to school. Although the same main unit 4 as the repeater 3 can be used, the power supply unit can be changed to, for example, a DC power supply device that can be connected to a commercial power supply of AC 100 [V]. The base unit 4 is connected to the Internet (network) 5 via the gateway 51. On the other hand, a server computer 6 is installed in the monitoring center, and this server computer 6 is connected to the Internet 5. As a result, the server computer 6 and the parent device 4 can perform data transmission / reception via the Internet 5. Furthermore, the personal computer (personal computer) 52 or the cellular phone 53 possessed by the guardian and the server computer 6 are configured to be able to transmit and receive via the Internet 5.

  In this case, the wireless specifications of the slave units 2... And the repeaters 3... Use specific low-power radio with the highest priority being independence from the power line, a long reach distance, and high connection capability due to diffraction. The example specific low power radio has a 429 [MHz] band and an output of 10 [mW]. The coverage area of each radio is 100 [m] × 100 [m] on average. Since this method has a weak point that the communication speed is not high (several kbps), the application used for the network is mainly character information. In order to avoid radio collision, the CSMA / CA with Ack method is adopted, and as a routing protocol suitable for the radio communication system, the repeaters 3 periodically receive route information of the repeaters 3. An ad hoc network system using a proactive method for constructing a relay route of its own station is used. The CSMA / CA with Ack method is a method in which each wireless terminal transmits data after confirming that the communication path is continuously available for a certain time or more. Is determined by the arrival of an ACK signal from the receiving side. The proactive method is a method in which each wireless terminal confirms the state of the wireless network prior to communication and constructs a relay route. Furthermore, the ad hoc network system is an autonomous distributed network that does not require a fixed station such as a base station and performs data transmission flexibly to a destination station by hopping data between semi-fixed wireless terminals.

  Next, the operation outline (normal mode) of the regional security system 1 will be described. Now, it is assumed that an arbitrary child H carries the handset 2 and goes to elementary school. At this time, handset 2 senses vibration during walking with vibration sensor 20 and transmits (transmits) information of its own station in packets every 2 minutes. FIG. 7 shows the data format of the packet Dp transmitted by the handset 2. The information part Dpi in this data format includes the type of periodic notification or emergency notification, the unique ID of the handset 2, and the regular notification is performed in normal times. If each repeater 3... Receives the periodic report, each received repeater 3... Relays the packet to which the received electric field strength is added sequentially to the base unit 4. In this case, the relay route of each repeater 3... Is set in advance.

  And if the main | base station 4 receives a regular notification, the received regular information will be transmitted to the server computer 6 via the gateway 51 and the internet 5. The server computer 6 registers the position of the repeater 3 that received the strongest radio wave in the database as the position of the slave unit 2 (or based on the received electric field strength with respect to the slave unit 2 of each repeater 3. Update. In this case, the position of the child device 2 may be an estimated position determined from the difference in the magnitude of the received electric field strength of the plurality of repeaters 3. On the other hand, the server computer 6 periodically grasps the position of the child device 2 based on the periodic notification of the child device 2 and monitors whether it is within the designated area of the child device 2 preset in the server computer 6. . At this time, when the user moves out of the designated area, the server computer 6 notifies the guardian (the personal computer 52, the mobile phone 53) and the related person by e-mail. On the other hand, in the case of an emergency call in which the emergency button 13 is pressed, the packet with the received electric field strength added is preferentially relayed to the base unit 4 and transmitted to the server computer 6, and the guardian is immediately sent from the server computer 6. Emergency notification by e-mail is made to the personal computer 52 and the mobile phone 53 and related parties.

  Further, the guardian can access the server computer 6 from the personal computer 52 or the mobile phone 53 and check the location of the child H (child device 2). In this case, access to the server computer 6 requires input of an ID and a password. When the vibration sensor 20 does not detect vibration during walking, the periodic report every 2 [minutes] is changed to a regular report every 1 [hour]. As a result, communication traffic is reduced.

  Next, the control method of the local crime prevention system 1 which concerns on this embodiment is demonstrated with reference to FIGS.

  In the control method of the local crime prevention system 1 according to the present embodiment, a newly set restriction mode is used in addition to the normal mode described in the operation outline described above. That is, when the local crime prevention system 1 operates (controls) in the normal mode, any relay 3 or base unit 4 is switched to the restriction mode when the predetermined restriction start condition is satisfied, and operates in the restriction mode. During (control), the repeater 3 or the master unit 4 switched to the restriction mode is switched to the normal mode when a predetermined restriction release condition is satisfied.

  The restriction start condition is that the number of periodic reports received from the slave units 2... Within any given time Tw (for example, 1 [minute]), that is, the regular report signal shown in FIG. The condition is that the number of times Dt... Has been received (number of times received Nr) is equal to or greater than the set number Nrs. On the other hand, the deregulation condition is that the fixed period Te elapses after switching to the regulation mode. In this case, the fixed period Te may be set by time (for example, 10 [minutes]), or the number of later-described restriction signals (Cc) transmitted from the repeater 3 or the master unit 4 switched to the restriction mode. (For example, 6 [times]) may be set.

  By the way, the setting of the restriction start condition is based on the fact that an arbitrary repeater 3 or parent device 4 receives from a plurality of child devices 2. For example, when the local crime prevention system 1 is designed with a capacity (capacity) assuming a maximum of 50 slave units 2..., This restriction is applied when a maximum of 50 slave units 2. A mode is not required. However, when the number of users of the slave units 2 increases and a maximum of 200 slave units 2 are used, the load becomes excessive and cannot be handled in the normal mode. Therefore, in the present invention, the substantial load is reduced by switching to the restriction mode. That is, in the restriction mode, the periodic notification process of the slave unit 2 is suspended, and the effective number of slave units 2 is reduced.

  This effectiveness will be described. Usually, the reception area of the repeater 3 (base unit 4) is set to a range of about 200 [m] in diameter. Within the range of about 200 [m] in diameter, when a certain number of handset 2 or more Nx are gathered, the child is in the elementary school, in the vicinity of the elementary school, or in an elementary school event (excursion, social tour, etc.) This is a case of group movement. In other words, it can be said that the situation where the number of slave units 2. Therefore, the necessity for regular notification processing under such circumstances is low. However, even under such circumstances, for example, when a regular notification process is required due to a child being separated from the group, it is necessary to promptly execute the regular report process.

  From such a request, in the present invention, the normal mode under the situation where the necessity for monitoring is high and the regulation mode under the situation where the necessity for monitoring is low are set, and the original function of the local security system 1 is lowered. Without being necessary, the total number of slave units 2 can be arbitrarily increased as needed, enabling flexible and expansive system operation and stabilizing the local crime prevention system 1. Can be further optimized to ensure reliability and reliability. In addition, after switching to the restriction mode, the restriction mode is canceled on the condition that the fixed period Te elapses, so that the return to the normal mode when switching from the normal mode to the restriction mode is performed reliably and accurately. It can be carried out.

  Hereinafter, a specific control method according to the present embodiment will be described according to the flowcharts shown in FIGS. 1 and 2 with reference to the timing chart shown in FIG. 1 shows a processing procedure (operation) on the repeater 3 side, and FIG. 2 shows a processing procedure (operation) on the slave unit 2 side.

  Now, it is assumed that the local security system 1 is operating (controlling) in the normal mode. Therefore, as shown in FIG. 3, the arbitrary slave unit 2 executes a periodic notification process for transmitting (transmitting) the periodic notification signal Dt at regular time intervals Tt (for example, 2 [minutes]) (step S21). ). The periodic notification signal Dt is a packet Dp (TEXT signal) shown in FIG.

  Specific processing of this periodic report will be described. First, the slave unit 2 in the standby state executes carrier sense when 2 [minutes] have elapsed from the previous periodic notification and it is time to make a call. When no other carrier is detected by executing carrier sense, it is determined that the line is idle and the guard time Tg is counted. This guard time Tg is set to an optimal time length, that is, an optimal time length (fixed length) in consideration of the quantity of all the slave units 2. When the guard time Tg has elapsed, the random waiting time Tr generated by a random number is subsequently counted. There are 37 random waiting times Tr of 5 [ms] between 20 and 200 [ms], which are selected by the generated random numbers.

  The reason why the guard time Tg and the random waiting time Tr are provided will be described. Since each handset 2 ... periodically reports at regular time intervals Tt, it is necessary to avoid occurrence of collision between the handset 2 ... at the time of regular notification (calling) of each handset 2 ... . For this reason, the carrier sense mentioned above is performed and the presence or absence of another carrier is confirmed. When there is no other carrier and the line is free, transmission is usually executed after a random waiting time Tr generated by a random number to avoid the occurrence of collision between the plurality of slave units 2 waiting. is doing. On the other hand, when the number of the slave units 2 increases, the collision between the slave units 2 and the repeaters 3 tends to increase even if the slave units 2 are exposed to each other. In view of this, a guard time Tg, which is a second waiting time in which an appropriate fixed length is set in consideration of the network configuration, is added before transmission of the periodic report by the slave unit 2 to improve the packet discard rate. That is, by adding the guard time Tg to the random waiting time Tr, the priority of packet transmission in the slave unit 2 is made lower than that of the repeater 3.

  On the other hand, since the slave unit 2 transmits (transmits) the periodic notification signal Dt by the periodic notification process, one or a plurality of repeaters 3 installed nearby receive the periodic notification signal Dt. And the repeater 3 ... which received receives the corresponding ACK signal Ds (acknowledgment response packet). Thereby, the subunit | mobile_unit 2 receives the ACK signal Ds, and a regular notification process is complete | finished normally. Thereby, the subunit | mobile_unit 2 returns to a standby state again. In the regular notification process in the normal mode, the above transmission / reception process is repeated.

  Next, the operation (control) when the restriction mode is required will be described. First, the operation on the repeater 3 side will be described. The repeater 3 counts the number of received periodic notification signals Dt... During the normal mode operation described above (steps S1, S2, S3). If a certain time Tw (1 [minute]) has elapsed since the start of counting, the number of receptions (count number) Nr within this certain time Tw is determined (steps S4 and S5). At this time, if the reception number Nr is less than the set number Nrs, the count number Nr is reset and the count is started again (steps S6, S1,...). On the other hand, when the number of receptions Nr is equal to or greater than the set number of times Nrs, that is, when the above-described regulation start condition is satisfied, the mode is switched to the regulation mode (steps S5 and S7).

  In FIG. 3, the time when the mode is switched to the restriction mode is indicated by ts. The repeater 3 transmits (transmits) the restriction ACK signal Ccs at the time ts when switching to the restriction mode (step S8). The restriction ACK signal Ccs is obtained by adding a 1-bit flag to the normal ACK signal Ds transmitted in response to the reception of the regular notification signal Dt, and is thereby distinguished from the normal ACK signal Ds. Therefore, the subunit | mobile_unit 2 can recognize that the receiving area of this repeater 3 was switched to regulation mode by receiving this regulation ACK signal Ccs. Thereafter, the repeater 3 transmits (transmits) the regulation command signal Cc... At every predetermined time Tc (for example, 2 [minutes]) (steps S9 and S10). The restriction signal in the present invention includes both the restriction command signal Cc and the restriction ACK signal Ccs.

  The transmission of the restriction command signal Cc continues for a certain period Te after switching to the restriction mode. As described above, this fixed period Te may be set by time, or may be set by the number of restriction signals (restriction command signals) Cc. The example is set by the number of restriction command signals Cc... And the number of times to be set (set number Na) is five. Therefore, when the number of transmissions of the restriction command signal Cc ... reaches the set number Na, the restriction release condition described above is satisfied, and the repeater 3 releases the restriction mode and switches to the normal mode (steps S11, S12). . Thereby, the repeater 3 returns to the standby state in the normal mode (step S13). Even after returning to the normal mode, whether or not the regulation start condition is satisfied is continuously monitored. Therefore, as long as the condition for satisfying the regulation start condition continues, the constant notification signal Dt... After the time Tw (1 [minute]) is counted, the mode is switched again to the restriction mode.

  Next, the operation on the handset 2 side will be described. Now, it is assumed that the slave unit 2 receives the above-described restriction ACK signal Ccs from the repeater 3 during the operation in the normal mode (steps S21 and S22). Thereby, since the subunit | mobile_unit 2 can recognize that the reception area of the repeater 3 was switched to the control mode, the subunit | mobile_unit 2 switches to transmission suspension mode (step S23). This transmission suspension mode is a restriction mode on the handset 2 side. The presence / absence of the restriction command signal Cc is monitored from the time (ts) at which the restriction ACK signal Ccs is received over the initial monitoring time Tcs (illustrated in 3 [minutes]) that is slightly longer than the above-described fixed time Tc (for example, 3 minutes). Step S24). At this time, if the restriction command signal Cc is not received within the initial monitoring time Tcs, it is normal that the handset 2 has left the predetermined communication area of the repeater 3 or a disturbance or the like. Return to the mode (steps S25, S21...). On the other hand, if the restriction command signal Cc is received within the initial monitoring time Tcs, the interval Ti is counted from the time tsi received (step S26).

  If the interval Ti has elapsed, the presence / absence of the restriction command signal Cc is monitored over the monitoring time Tf (step S27). At this time, if the restriction command signal Cc is received, similar processing, that is, processing for monitoring the presence or absence of the restriction command signal Cc over the monitoring time Tf is repeated (steps S28 and S27). On the other hand, if the restriction command signal Cc is not received when the presence or absence of the restriction command signal Cc is monitored over the monitoring time Tf, the transmission suspension mode is canceled (steps S28 and S29). In addition, when the restriction command signal Cc is not received, the restriction mode of the repeater 3 is normally released, and the slave unit 2 is out of the predetermined communication area of the repeater 3 in the middle of the restriction mode of the repeater 3. Both cases are assumed when it comes out. By canceling the transmission suspension mode, the handset 2 returns to the regular notification processing operation in the normal mode (step S30). In FIG. 3, te indicates a point in time when the handset 2 first transmits the periodic notification signal Dt when the restriction mode (transmission suspension mode) is canceled. In the restriction mode on the repeater 3 side, the restriction mode is canceled when the last restriction command signal Cc is transmitted (when a certain period Te has elapsed). Therefore, the time point te is a substantial release point of the restriction mode.

  FIG. 8 shows in principle the reception areas Ar of the repeaters 3. 8 is an image of a state in which the repeater 3x is switched to the restriction mode, and Ko coincides with the reception area Ar of the repeater 3x. The machine 2 is a line for switching to the normal mode. That is, the slave unit 2 is switched from the transmission suspension mode to the normal mode by exiting from the inside to the outside of the line Ko. The square line of Ki is a line in which the reception electric field strength of the reception area Ar of the repeater 3x is higher than the other reception areas Ar, and this Ki line is a line for switching to the restriction mode. That is, when the handset 2 enters from the outside to the inside of the line Ki, the normal mode is switched to the transmission suspension mode. This is because the line Ki is located in the center of the overlapping reception area Ar ..., but the handset 2 receives only the ACK signal Ds (regulated ACK signal Ccs) from the repeater 3x having the highest received electric field strength.

  Therefore, according to such a control method, the normal mode is established if a predetermined restriction start condition set based on the reception of any given repeater 3 or parent device 4 from the child devices 2. Instead of executing the restriction mode and canceling the restriction mode if a predetermined restriction release condition set in advance is satisfied, in the restriction mode, the restriction mode is transmitted from the repeater 3 or the master unit 4 that satisfies the restriction start condition. Are transmitted at predetermined time intervals Tc, while the slave units 2 receive the control signals (Cc, Ccs). If this is done, the transmission suspension mode is switched to the transmission suspension mode in which transmission is suspended, and the transmission suspension mode is canceled based on the cancellation of the restriction mode, so that the original function of the local security system 1 is not degraded. While ensuring a qualitative and reliable, the handset 2 ... total number of can be arbitrarily increased. Therefore, a flexible and expansive system operation is possible, and it is optimally applied especially to a school area.

  The best embodiment has been described in detail above, but the present invention is not limited to such an embodiment, and departs from the gist of the present invention in the detailed configuration, shape, method, quantity, numerical value, and the like. It can be changed, added, or deleted as long as it is not.

  For example, the regulation start condition and the regulation release condition can be set as follows. That is, based on the possibility of receiving from a certain number Nx or more of the slave units 2..., An arbitrary repeater 3 or master unit 4 is fixed in the restriction mode in advance, and any repeater 3 or parent unit fixed in the restriction mode is fixed. The restriction start condition may be that the child device 2 enters the predetermined communication area Ki of the device 4. For example, since the parent device 4 installed in the elementary school is likely to receive from the child devices 2... Of a certain number Nx or more at least during a predetermined time, the parent device 4 is fixed in the restriction mode in advance. Can do. Therefore, in this case, since monitoring and control for switching to or canceling the restriction mode is not necessary, the control of the local security system 1 is simplified while ensuring the stability and reliability of the local security system 1. Can do. On the other hand, the restriction mode can be canceled with the restriction release condition that the slave unit 2 exits from the predetermined communication area Ko of any repeater 3 or base unit 4 fixed in the restriction mode. Even when any repeater 3 or the master unit 4 fixed in the restriction mode is installed, the transition to the normal mode can be performed reliably and accurately by leaving the optional repeater 3 or the master unit 4. It can be carried out.

  On the other hand, although the case where the main | base station 4 and the server computer 6 were connected via the internet was shown, you may connect by other networks 5, such as LAN, and you may connect by a simple connection line. In addition, although the local crime prevention system 1 showed the case where it applied to a commuting area as area Ac, it can utilize for various watching systems as local infrastructure, such as the safety of an elderly person living alone, a bus location, etc.

The flowchart which shows the operation | movement (processing procedure) by the side of the repeater of the control method of the local crime prevention system which concerns on best embodiment of this invention, The flowchart which shows the operation | movement (processing procedure) of the subunit | mobile_unit side of the control method of the same area security system, Timing chart for explaining the operation when using the control method of the local crime prevention system, System configuration diagram showing the entire area security system, External view showing the usage of slave units and repeaters used in the local crime prevention system, Electrical system diagram of handset and repeater used in the local security system, Data format configuration diagram of the packet transmitted by the handset used in the local security system, The principle diagram of the receiving area of the repeater to explain the action when using the control method of the local crime prevention system,

Explanation of symbols

  1: Regional security system, 2 ...: Remote unit, 2t ...: Wireless communication unit, 3 ...: Repeater, 3t ...: Ad hoc communication unit, 4: Master unit, 4t: Ad hoc communication unit, 6: Server computer, H: Person subject to crime prevention, Ac: predetermined area, Cc ...: restriction signal (regulation command signal), Ccs: restriction signal (regulation ACK signal), Tc ...: time interval, Tt: fixed time, Dt ...: periodic notification signal, Tw : Fixed time, Te: fixed period, Nr: number of receptions, Nrs: set number of times, Ko: predetermined communication area, Ki: predetermined communication area

Claims (7)

  A plurality of slave units each having a wireless communication unit provided with a wireless ID tag and capable of being carried by a plurality of crime prevention subjects, and an ad hoc communication unit provided with a wireless ID tag, and a plurality in a predetermined area In the method of controlling a local crime prevention system comprising a plurality of repeaters installed at different predetermined locations, at least one master unit having an ad hoc communication unit, and a server computer connected to the master unit, any repeater or If the parent device satisfies a predetermined restriction start condition set based on receiving from a certain number of child devices, the restriction mode is executed instead of the normal mode, and the predetermined restriction release condition is satisfied. If the restriction mode is canceled, the restriction mode indicates that the restriction mode is established from a repeater or a master unit that satisfies the restriction start condition. When the restriction signal is received, the slave unit switches to a transmission suspension mode in which transmission is suspended, and cancels the transmission suspension mode based on cancellation of the restriction mode. A method of controlling a local crime prevention system characterized by that.   The local security system control method according to claim 1, wherein, in the normal mode, the slave unit transmits a periodic notification signal at least at regular time intervals.   Arbitrary repeater or master unit counts the number of times that the periodic notification signal is received from the slave unit within a certain time, and the restriction is set as the restriction start condition that the counted number of receptions is equal to or greater than a preset number of times. 3. The method of controlling a local security system according to claim 2, wherein the mode is switched to a mode.   4. The control method for a local crime prevention system according to claim 3, wherein after the switching to the restriction mode, the restriction mode is canceled with a certain period of time elapses as the restriction release condition.   Arbitrary repeaters or master units are fixed in advance in the restriction mode based on the possibility of receiving from a certain number of slave units or more, and a predetermined communication area of the repeater or master unit in which the slave units are fixed in the restriction mode The control method of the local crime prevention system according to claim 1, wherein the restriction mode is executed with entering the restriction as the restriction start condition.   6. The control method for a local crime prevention system according to claim 5, wherein the restriction mode is canceled with the restriction release condition being that a slave unit exits from a predetermined communication area of the repeater or the master unit fixed in the restriction mode. .   2. The regional crime prevention system control method according to claim 1, wherein the local security system is applied to at least a commuting area as the area.

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