JP2023082536A - Alarm system, control device, allocation method, and program - Google Patents

Abstract

To provide a technology for reducing transfer delay time in a multi-hop network.SOLUTION: A first fire alarm 600a is assigned a first time slot of a plurality of time slots arranged on a time axis. A second fire alarm 600b is assigned a second time slot that is a second time slot among the plurality of time slots arranged on the time axis and that is different from the first time slot. According to a first hop number between the first fire alarm 600a and a first relay device 700a and a second hop number between the second fire alarm 600b and the first relay device 700a, an order of the first time slot and the second time slot in the plurality of time slots is determined.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present disclosure relates to alert technology, and more particularly to an alert system, control device, allocation method, and program using a multi-hop network.

A fire alarm will give an alarm when a fire is detected. By equipping such fire alarms with a wireless communication function and forming a multi-hop network with a plurality of fire alarms, when one fire alarm detects a fire, the other fire alarms issue an alarm. (See Patent Document 1, for example).

Japanese Unexamined Patent Application Publication No. 2011-35468

When forming a multi-hop network with a plurality of fire alarms, it is required to shorten the transfer delay time in the multi-hop network.

The present disclosure has been made in view of such circumstances, and an object of the present disclosure is to provide a technique for reducing transfer delay time in a multi-hop network.

In order to solve the above problems, an alarm system according to one aspect of the present disclosure includes a plurality of alarm devices forming a multi-hop network extending from relay devices. The multiple alarms include a first alarm and a second alarm. The first alarm device is assigned the first time slot of a plurality of time slots arranged on the time axis, the first alarm device transmits a signal in the first time slot, and the signal is sent to the second alarm device. is the second time slot among a plurality of time slots arranged on the time axis and is assigned a second time slot different from the first time slot, and the second alarm is assigned the second time slot and a first time slot and a second time slot in a plurality of time slots according to a first hop number between the first alarm and the relay device and a second hop number between the second alarm device and the relay device. The order of the two time slots is determined.

Another aspect of the present disclosure is a controller. This device is a control device for a plurality of alarms constituting a multi-hop network spreading from a relay device, the plurality of alarms including a first alarm and a second alarm, the first alarm being: Allocating a first time slot out of the plurality of time slots arranged on the time axis, assigning a second time slot of the plurality of time slots arranged on the time axis to the second alarm device, and an allocation unit for allocating a second time slot different from the first time slot; and an output unit for outputting the allocation result of the allocation unit. The assigning unit assigns a first time slot and a second time in the plurality of time slots according to a first hop count between the first alarm device and the relay device and a second hop count between the second alarm device and the relay device. Determines the order of slots.

Yet another aspect of this disclosure is an allocation method. This method is a method of assigning a plurality of alarms to a plurality of alarms constituting a multi-hop network extending from a relay device in a control device, the plurality of alarms including a first alarm, a second alarm, and a first alarm. is assigned the first time slot among the plurality of time slots arranged on the time axis, and the second alarm device is assigned the second time slot among the plurality of time slots arranged on the time axis. and assigning a second time slot different from the first time slot; and outputting the assignment result. The step of allocating comprises first time slots and second time slots in the plurality of time slots according to a first hop number between the first alarm and the relay and a second hop number between the second alarm and the relay. Determines the order of slots.

It should be noted that any combination of the above-described components and expressions of the present disclosure converted between methods, devices, systems, recording media, computer programs, etc. are also effective as aspects of the present disclosure.

According to the present disclosure, when constructing a multi-hop network, it is possible to provide information for determining where to install an alarm device.

It is a figure which shows the structure of the alarm system which concerns on a present Example. It is a figure which shows the structure of the fire alarm of FIG. 3(a)-(d) are diagrams showing the structure of a superframe used in the alarm system of FIG. 1. FIG. 2 is a diagram showing the configuration of a relay device in FIG. 1; FIG. 2 is a diagram showing an example of allocation of time slots in the alarm system of FIG. 1; FIG. 2 is a diagram showing an overview of downstream communication in the alarm system of FIG. 1; FIG. 2 is a diagram showing an overview of upstream communication in the alarm system of FIG. 1; FIG. 2 is a diagram showing an overview of routing in the alarm system of FIG. 1; FIG. FIG. 2 is a sequence diagram showing a routing procedure in the alarm system of FIG. 1; 10(a)-(b) are diagrams showing the data structures of tables held in the 1n+1-th fire alarm in FIG. 11(a)-(b) are diagrams showing the data structures of tables held in the 1n+3 fire alarm in FIG. 9. FIG. 12(a)-(b) are diagrams showing an overview of the construction of the alarm system of FIG. It is a figure which shows the structure of the external device of Fig.12 (a). 14 is a diagram showing a screen displayed on the display unit of FIG. 13; FIG. 15(a) and 15(b) are diagrams showing the configuration of part of the alarm system of FIG. 1. FIG. It is a figure which shows the outline|summary of downstream communication in the alarm system of Fig.15 (a). FIGS. 17(a) and 17(b) are diagrams showing an outline of downstream communication in the alarm system of FIG. 15(b).

Before describing the present disclosure in detail, an overview will be given. This embodiment relates to an alarm system installed in facilities such as collective housing, detached houses, offices, and hospitals. In the alarm system, a relay device is connected to the management device, and a plurality of fire alarms are connected to the relay device via a wireless multi-hop network. In such a network, the management device corresponds to the upper side, and the fire alarm device with the largest number of hops from the relay device corresponds to the lower side. When the fire alarm detects the occurrence of fire, it transfers the detection result to the relay device, and the relay device transfers the detection result to the management device. Upon receiving the detection result, the management device selects one or more fire alarms to be sounded, and transmits a sounding instruction to the selected one or more fire alarms as the final destination. The repeater and the fire alarm forward the instruction to ring to the final destination fire alarm, and the final destination fire alarm performs the ringing upon receiving the instruction to ring.

Here, when the line for the signal from the repeater to the fire alarm with the highest number of hops is called a "downlink", the signal from the fire alarm with the highest number of hops to the relay is called a "downlink". is called the "uplink". In this embodiment, one frame is formed by arranging a plurality of time slots, and one superframe is formed by arranging a plurality of frames. One fire alarm is assigned to one downlink time slot (hereinafter referred to as "downlink communication time slot") and to one uplink time slot (hereinafter referred to as "uplink communication time slot"). assigned to a “slot”). Downlink time slots are used for downlink transfers, and uplink time slots are used for uplink transfers.

In the downlink, in addition to the ringing instruction, a signal for establishing synchronization of the multi-hop network (hereinafter referred to as "synchronization signal") is periodically transferred. On the other hand, in the uplink, detection results are mainly transferred. In the following description, the synchronizing signal, detection result, and ringing instruction may be collectively referred to as "communication signal".

In the following, this embodiment will be described in order of (1) basic configuration, (2) routing, (3) construction, and (4) time slot allocation correction.
(1) Basic Configuration FIG. 1 shows the configuration of an alarm system 1000. As shown in FIG. The alarm system 1000 includes first fire alarm devices 600 a to ninth fire alarm devices 600 i collectively referred to as fire alarm devices 600 , first relay devices 700 a to third relay devices 700 c collectively referred to as relay devices 700 , and a management device 800 . include. The number of fire alarms 600 is not limited to "9", and the number of relay devices 700 is not limited to "3".

The alarm system 1000 is a system that is applied to facilities such as residences, offices, commercial facilities, etc., detects fires, and reports that a fire has occurred. The plurality of fire alarms 600 are, for example, residential fire alarms and include fire detection sensors. The plurality of fire alarms 600 are installed, for example, on the ceiling or the like of the facility, but may be installed on the walls or the like.

Here, the first fire alarm device 600a to the sixth fire alarm device 600f constitute a wireless multi-hop network extending from the first relay device 700a. For example, a relay route connecting the first relay device 700a, the first fire alarm 600a and the second fire alarm 600b, the first relay device 700a, the fourth fire alarm 600d, the fifth fire alarm 600e and the third fire alarm A relay route connecting the device 600c is formed. A relay route connecting the first relay device 700a, the fourth fire alarm device 600d, the fifth fire alarm device 600e, and the sixth fire alarm device 600f, and a relay route connecting the first relay device 700a and the seventh fire alarm device 600g. It is formed. Such a relay route is determined in each fire alarm device 600 and shared by the first relay device 700a and the management device 800 as well.

On these relay routes, the first fire alarm device 600a, the fourth fire alarm device 600d, and the seventh fire alarm device 600g can communicate with the first relay device 700a with "1" hop count. The second fire alarm device 600b and the fifth fire alarm device 600e can communicate with the first relay device 700a with "2" hops. The third fire alarm 600c and the sixth fire alarm 600f can communicate with the first relay device 700a with "3" hops.

The second relay device 700b, the third relay device 700c, the eighth fire alarm 600h, and the ninth fire alarm 600i are configured similarly to the first relay device 700a, the first fire alarm 600a, and the like. For example, a multi-hop network originating from the first relay device 700a is installed on the first floor of the facility, a multi-hop network originating from the second relay device 700b is installed on the second floor of the facility, and the third relay device 700c is installed. A multi-hop network serving as a starting point is installed on the third floor of the facility. Different frequencies are used for the multi-hop network starting from the first relay device 700a, the multi-hop network starting from the second relay device 700b, and the multi-hop network starting from the third relay device 700c. be. Also, the first relay device 700a, the second relay device 700b, and the third relay device 700c perform wireless communication or wired communication with each other.

In this manner, the relay device 700 performs wireless communication with the plurality of fire alarms 600 forming the multi-hop network, and wireless communication or wired communication with other relay devices 700 . It can be said that the relay device 700 relays communication between the multiple fire alarms 600 included in the multi-hop network. Further, the first relay device 700a is connected to the management device 800 by a cable, and performs wired communication with the management device 800. FIG.

The management device 800 is, for example, a controller of HEMS (Home Energy Management System) installed in a facility. Management device 800 can communicate with a plurality of devices provided in the facility. The plurality of devices includes, for example, air conditioners, lighting devices, water heaters, etc., each having a communication function. Also, the management device 800 can communicate with the first relay device 700a provided in the facility. Furthermore, the management device 800 can also communicate with the second relay device 700b, the third relay device 700c, and each fire alarm 600 via the first relay device 700a.

FIG. 2 shows the configuration of the fire alarm 600. As shown in FIG. The fire alarm 600 includes a communication section 620 , a processing section 622 , a control section 624 , a fire detection sensor 630 and a buzzer 632 . A known technique may be used for the fire detection sensor 630 . For example, the fire detection sensor 630 may be an optical smoke detection sensor, and may detect a fire by detecting smoke during a fire using diffused reflection of light. For example, the fire detection sensor 630 may be a heat detection sensor, and may detect a fire by detecting heat during a fire. For example, the fire detection sensor 630 may be a carbon monoxide detection sensor, and may detect a fire by detecting the concentration of carbon monoxide generated by combustion during a fire. For example, the fire detection sensor 630 may be an infrared detection sensor, and may detect a fire by detecting infrared rays emitted by combustion in the event of a fire.

Communication unit 620 performs wireless communication with other fire alarm 600 or relay device 700 . The processing unit 622 processes signals received by the communication unit 620 and generates signals to be transmitted from the communication unit 620 . The control unit 624 controls operations of the communication unit 620 and the processing unit 622 . Details of the processing of the control unit 624 will be described later. The buzzer 632 can ring a buzzer sound. The fire alarm 600 may be configured to include the fire detection sensor 630 without including the buzzer 632, that is, to have a detection function and a communication function. It can be said that the fire alarm 600 as described above is a sensor capable of alarming the detection of fire.

3(a)-(d) show the structure of a superframe used in the alarm system 1000. FIG. A certain period of time is defined as a superframe 1010 as shown in FIG. The superframe 1010 is arranged repeatedly. A superframe 1010 is divided into multiple frames 1020 . As shown in FIG. 3(b), one frame 1020 is divided into a plurality of time slots 1030. As shown in FIG. FIG. 3(c) shows one time slot 1030. FIG. Communication signals are transmitted in timeslots 1030 . The duration of the communication signal is less than the duration of one timeslot 1030 .

FIG. 3(d) shows the usage of multiple time slots 1030 included in the frame 1020 shown in FIG. 3(b). One or more time slots 1030 at the beginning of a plurality of time slots 1030 are used as "downlink communication time slots". One time slot 1030 following the downlink communication time slot is used as an "uplink communication time slot". One or more time slots 1030 following the upstream time slot are used for "spare". The number of time slots for downlink communication and the number of time slots for uplink communication are the same and greater than or equal to the number of fire alarms 600 included in the multihop network. You don't have to have spares.

FIG. 4 shows the configuration of the relay device 700. As shown in FIG. It can also be said that the relay device 700 is a control device for the plurality of fire alarms 600 forming the multi-hop network. Relay device 700 includes communication unit 710 and control unit 720 , communication unit 710 includes output unit 712 , control unit 720 includes allocation unit 722 . Communication unit 710 has a communication function for communicating with a plurality of relay devices 700 and a communication function for communicating with management device 800 . Control unit 720 controls the operation of relay device 700 .

The communication unit 710 receives the result of routing performed in each fire alarm 600 by communicating with the plurality of fire alarms 600 forming the multi-hop network. The routing performed in each fire alarm 600 will be described later, but each relay route as shown in FIG. 1 is indicated by the result of the routing.

The allocation unit 722 allocates a combination of one downlink communication time slot and one uplink communication time slot shown in FIG. 3D to one fire alarm 600 based on the routing result. Allocation by the allocation unit 722 will also be described later, but the combination of downlink communication time slots and uplink communication time slots is changed for each fire alarm 600 . The output unit 712 outputs the allocation results from the allocation unit 722 to the multiple fire alarms 600 . The allocation result shows the correspondence relationship between the combination of the time slot for downlink communication and the time slot for uplink communication and the fire alarm 600 .

FIG. 5 shows an example of time slot allocation in the alarm system 1000, and is shown in the same manner as FIG. 3(d). This shows the allocation of multiple timeslots 1030 to the first repeater 700a, the first fire alarm 600a through the seventh fire alarm 600g of FIG. "M" in FIG. 5 indicates the first relay device 700a, and "S1" to "S7" indicate the first fire alarm 600a to the seventh fire alarm 600g, respectively. The down communication time slots include the first relay device 700a, the first fire alarm 600a, the fourth fire alarm 600d, the seventh fire alarm 600g, the second fire alarm 600b, the fifth fire alarm 600e, The third fire alarm 600c and the sixth fire alarm 600f are assigned in order from the front side. As described above, the number of hops from the first fire alarm 600a, the fourth fire alarm 600d, and the seventh fire alarm 600g to the first relay device 700a is "1". The number of hops from the second fire alarm 600b and the fifth fire alarm 600e to the first relay device 700a is "2", and the number of hops from the third fire alarm 600c and the sixth fire alarm 600f to the first relay device 700a is "2". is "3". That is, the fire alarm 600 with the smaller number of hops to the first relay device 700a is assigned to the front side of the time slot for downlink communication.

The upstream communication time slots include a sixth fire alarm 600f, a third fire alarm 600c, a fifth fire alarm 600e, a second fire alarm 600b, a seventh fire alarm 600g, a fourth fire alarm 600d, The first fire alarm device 600a and the first relay device 700a are assigned in order from the front side. In other words, the fire alarm 600 with a larger number of hops to the first relay device 700a is assigned to the front side of the upstream communication time slot.

When focusing on the fifth fire alarm device 600e with the hop count of "2", the fifth fire alarm device 600e is assigned a downlink communication time slot ahead of the sixth fire alarm device 600f with the hop count of "3". be done. Downlink communication time slots are used when a signal (communication signal) is transferred in a direction away from first relay device 700a in a multi-hop network. Also, the fifth fire alarm 600e is assigned an upstream communication time slot behind the sixth fire alarm 600f. The uplink communication time slot is used when a signal (communication signal) is transferred in a direction approaching the first relay device 700a in the multihop network. That is, the relay device 700 determines the time slot 1030 to be assigned to each fire alarm device 600 among the plurality of time slots 1030 according to the number of hops between each fire alarm device 600 and the relay device 700 .

The fifth fire alarm device 600e is assigned a time slot "S5" for downlink communication and a time slot "S5" for uplink communication. A signal (communication signal) is transmitted in time slot "S5". The sixth fire alarm device 600f is assigned a time slot "S6" for downlink communication and a time slot "S6" for uplink communication. A signal (communication signal) is transmitted in the time slot "S6".

Allocation of these time slots 1030 is determined by allocation section 722 of first relay device 700a, but may be determined by management device 800. FIG. For example, the first relay device 700a or the management device 800 determines allocation of the time slots 1030 based on relay route information. The first relay device 700a or the management device 800 notifies each fire alarm device 600 of the determined time slot 1030 allocation. Therefore, each fire alarm 600 also keeps track of these time slot 1030 assignments. As a result, the fire alarm 600 recognizes the time slot 1030 in which the communication signal should be transmitted and the time slot 1030 assigned to itself. Fire alarm 600 also recognizes time slot 1030 in which it is possible to receive communication signals from adjacent fire alarm 600 or relay device 700 on the relay route.

Under such circumstances, the communication unit 620 of the fire alarm 600 may perform an intermittent reception operation to reduce power consumption. In the intermittent reception operation in communication section 620, the reception operation is performed in a partial period of the leading portion of time slot 1030, and if no signal (communication signal) is received in the partial period, the remaining period of time slot 1030 Receive operation is stopped. On the other hand, if a signal is received during a partial period of the leading portion of time slot 1030, the reception operation is continued during the remaining period of time slot 1030. FIG.

FIG. 6 shows an outline of downstream communication in the alarm system 1000. As shown in FIG. This indicates the time slot for downstream communication in FIG. The first relay device 700a periodically transmits synchronization signals to the plurality of fire alarms 600 forming the multi-hop network. A synchronization signal is, for example, a beacon signal. The synchronization signal is transmitted, for example, in the first frame 1020 of the superframe 1010 shown in FIG. 3(a), and is not transmitted in the remaining frames 1020. The first relay device 700a transmits the synchronization signal in the time slot 1030 “M” in the first frame 1020 of the superframe 1010 . When the fourth fire alarm 600d receives the synchronization signal in time slot 1030 "M", it transmits the synchronization signal in time slot 1030 "S4". Also, the fourth fire alarm device 600d transmits a response signal to the first relay device 700a in the time slot 1030 "S4". The response signal is, for example, Ack (ACKnowledgement). The response signal may be included as part of the synchronization signal.

The first relay device 700a receives the response signal at time slot 1030 "S4". When the fifth fire alarm device 600e receives the synchronization signal in the time slot 1030 "S4", it transfers the synchronization signal in the time slot 1030 "S5" and also transmits a response signal to the fourth fire alarm device 600d. The fourth fire alarm 600d receives the response signal in time slot 1030 "S5." Although omitted in FIG. 11, the fourth fire alarm device 600d transfers the response signal from the fifth fire alarm device 600e to the first relay device 700a at time slot 1030 "S4" of the next frame.

When the third fire alarm 600c receives the synchronization signal in the time slot 1030 "S5", it transfers the synchronization signal in the time slot 1030 "S3" and also transmits a response signal to the fifth fire alarm 600e. When the sixth fire alarm 600f receives the synchronization signal in the time slot 1030 "S5", it transfers the synchronization signal in the time slot 1030 "S6" and also transmits a response signal to the fifth fire alarm 600e.

The fifth fire alarm 600e receives response signals in timeslots 1030 "S3" and "S6." Although omitted in FIG. 6, the fifth fire alarm 600e receives the response signal from the third fire alarm 600c and the response signal from the sixth fire alarm 600f at time slot 1030 "S5" of the next frame. is transferred to the fourth fire alarm 600d. The fourth fire alarm 600d further forwards the response signal from the fifth fire alarm 600e to the first repeater 700a at time slot 1030 "S4" of the next frame.

In this way, the synchronization signal is transferred in frame 1020 in which the first relay device 700a has transmitted the synchronization signal. Also, each fire alarm 600 that has received the synchronization signal from the first relay device 700a establishes timing synchronization with the first relay device 700a based on the synchronization signal. Since a well-known technique may be used for timing synchronization, the explanation is omitted here.

FIG. 7 shows an outline of upstream communication in the alarm system 1000. As shown in FIG. This indicates the time slot for upstream communication in FIG. Here, it is assumed that the fire detection sensor 630 of the sixth fire alarm 600f detects the occurrence of fire. The processing unit 622 of the sixth fire alarm 600f causes the communication unit 620 to transmit the detection result. The detection result includes the identification information of the sixth fire alarm device 600f that detected the fire. The communication unit 620 of the sixth fire alarm 600f transmits the detection result in the time slot 1030 "S6".

The fifth fire alarm 600e receives the detection result at time slot 1030 "S6". Following this, the fifth fire alarm 600e forwards the detection result in time slot 1030 "S5". Also, the fifth fire alarm 600e transmits a response signal to the sixth fire alarm 600f in time slot 1030 "S5". A response signal may be included as part of the detection result.

The sixth fire alarm 600f receives the response signal in time slot 1030 "S5." The fourth fire alarm 600d receives the detection result at time slot 1030 "S5". The fourth fire alarm 600d transfers the detection result in time slot 1030 "S4" and also transmits a response signal to the fifth fire alarm 600e.

The fifth fire alarm 600e receives the response signal in time slot 1030 "S4." Although omitted in FIG. 12, the fifth fire alarm 600e transfers the response signal from the fourth fire alarm 600d to the sixth fire alarm 600f at time slot 1030 "S5" of the next frame 1020. FIG.

The first relay device 700a receives the detection result at time slot 1030 "S4". As before, the first repeater 700a transmits a response signal in time slot 1030 "M". The response signal is transferred by the fourth fire alarm device 600d and the fifth fire alarm device 600e, and received by the sixth fire alarm device 600f.

The first relay device 700a transmits the detection result to the management device 800 when receiving the detection result from the fourth fire alarm device 600d. Upon receiving the detection result, the management device 800 identifies the fire alarm 600 to be activated based on the identification information included in the detection result. The correspondence relationship between the identification information and the information of the fire alarm 600 to be sounded is stored in the management device 800 in advance. The management device 800 sends a ringing instruction to the first relay device 700a with the specified fire alarm 600 as the final destination.

When the fire alarms 600 specified in the management device 800 are the third fire alarm 600c and the sixth fire alarm 600f, the same transfer as in FIG. 600c and the sixth fire alarm 600f. Here, a ringing instruction is transmitted instead of the synchronization signal in FIG. When the second relay device 700b and the third relay device 700c receive the ringing instruction from the management device 800 via the first relay device 700a, they transfer the ringing instruction to the fire alarm device 600. FIG. When the communication unit 620 of the third fire alarm 600c and the sixth fire alarm 600f receives the ringing instruction, the control unit 624 causes the buzzer 632 to ring. The control unit 624 may blink the light emitting device.

(2) Routing So far, it is assumed that the relay route as shown in FIG. 1 has been formed, but here, the formation and change of the relay route will be explained using FIG. 8 as well. FIG. 8 shows an overview of routing in alarm system 1000 . In FIG. 8, the n+1th fire alarm 600n+1, the n+2th fire alarm 600n+2, the n+3th fire alarm 600n+3, and the relay device 700 of the alarm system 1000 are shown. The n+1th fire alarm 600n+1, the n+2th fire alarm 600n+2, and the n+3th fire alarm 600n+3 correspond to any of the fire alarms 600 in FIG. Fire alarms 600 other than the n+1th fire alarm 600n+1 and the n+2th fire alarm 600n+2, for example, the n+4th fire alarm 600n+4 (not shown) may exist around the n+3th fire alarm 600n+3. .

In the following, (2-1) forming a relay route and (2-2) changing the relay route will be described in this order.
(2-1) Formation of Relay Route FIG. 9 is a sequence diagram showing a routing procedure in the alarm system 1000. FIG. Here, the routing process will be described focusing on the n+3th fire alarm 600n+3. Each fire alarm 600 broadcasts a HELLO message at regular intervals. The HELLO message includes route quality information from fire alarm 600 to relay device 700 . The communication unit 620 of the n+3th fire alarm 600n+3 receives HELLO messages from the n+1th fire alarm 600n+1, the n+2th fire alarm 600n+2, and the n+4th fire alarm 600n+4 (S10, S12, S14).

The communication unit 620 of the n+3th fire alarm 600n+3 measures the reception power of each received HELLO message, and the processing unit 622 derives the link quality for each fire alarm 600 based on the measured reception power. The link quality is a value that changes according to the received power and decreases as the received power increases. The aforementioned route quality is indicated as well as the link quality. The control unit 624 derives the tentative route cost as follows by adding the link quality of the n+1th fire alarm 600n+1 and the route quality included in the HELLO message from the n+1th fire alarm 600n+1.
Temporary route cost=route quality+Ka×link quality+Kb×C Equation (1)
Here, Ka and Kb are coefficients and C is a predetermined constant. If Kb is "0" when forming a relay route, Kb*C is ignored.

The control unit 624 also derives tentative route costs for other fire alarms 600 . The control unit 624 compares a plurality of provisional route costs and selects several fire alarm devices 600 in descending order of provisional route cost as priority link destinations. Here, for example, the n+1th fire alarm 600n+1 and the n+2th fire alarm 600n+2 are selected as priority link destinations.

The communication unit 620 of the n+3th fire alarm 600n+3 transmits the address of the selected fire alarm 600 and the link quality at the time of reception in a LINK_REQ sub-message of the HELLO message (S16, S18). The (n+1)-th fire alarm 600n+1 and the (n+2)-th fire alarm 600n+2 include the reverse link quality in the LINK_REP sub-message and transmit (S20, 22).

The communication unit 620 of the n+3th fire alarm 600n+3 receives the LINK_REP sub-message. The control unit 624 of the n+3th fire alarm 600n+3 compares the link quality included in the LINK_REP sub-message from the n+1th fire alarm 600n+1 with the link quality derived based on the already measured received power, Choose a higher link quality. Also, the control unit 624 derives the formal route cost as follows by adding the selected link quality and the route quality for the (n+1)-th fire alarm 600n+1.
Formal route cost = Route quality + Ka x Max (link quality) + Kb x C Formula (2)
where Max indicates selecting the maximum link quality.

The control unit 624 also derives the formal root cost for the n+2th fire alarm 600n+2. The control unit 624 compares the official route cost for the n+1th fire alarm 600n+1 and the official route cost for the n+2th fire alarm 600n+2, and selects the smaller one as the relay route. Relay routes that are not selected may be used as alternate routes.

That is, the n+3-th fire alarm 600n+3 exchanges link quality information with the n+1-th fire alarm 600n+1 to establish a relay route ( A formal route cost (hereinafter referred to as "first cost") for the "first relay route") is derived. Also, the n+3th fire alarm 600n+3 exchanges link quality information with the n+2th fire alarm 600n+2, thereby providing a relay route ( A formal route cost (hereinafter referred to as "second cost") for the "second relay route") is derived. Furthermore, the (n+3)th fire alarm 600n+3 preferentially selects the relay route with the smaller first cost and second cost. By performing such processing in each fire alarm 600, a relay route is formed. Information about the relay route (alternative route) formed in each fire alarm device 600 is transmitted to the management device 800 via the relay device 700 . Management device 800 determines allocation of time slots 1030 according to the number of hops based on information about relay routes (alternative routes).

(2-2) Change of Relay Route When the relay route is formed as described above, the fire alarms 600 included in the relay route execute signal transfer. Signal transfer increases the power consumption of the fire alarm 600 . If the fire alarm 600 is battery driven, it is preferable that the power consumption is small. In order to suppress an increase in power consumption in fire alarm 600, the relay route is changed.

The control unit 624 of the n+1th fire alarm 600n+1 included in the first relay route connecting the n+3th fire alarm 600n+3 and the relay device 700 in FIG. to measure The number of communications includes at least one of the number of transmissions and the number of receptions. The control unit 624 holds a correspondence relationship between communication frequency and power consumption, and derives power consumption based on the communication frequency. In the correspondence relationship, the power consumption increases as the frequency of communication increases.

Also, the control unit 624 of the n+1th fire alarm 600n+1 may count the number of other fire alarms 600 with which the n+1th fire alarm 600n+1 communicates directly. The control unit 624 holds the correspondence between the number of other fire alarms 600 and power consumption, and derives the power consumption based on the number of other fire alarms 600 . In the corresponding relationship, the power consumption increases as the number of other fire alarms 600 increases. Furthermore, the control unit 624 of the n+1th fire alarm 600n+1 may measure the remaining battery level of the n+1th fire alarm 600n+1. The control unit 624 holds the correspondence relationship between the remaining battery level and power consumption, and derives the power consumption based on the remaining battery level. In the correspondence relationship, the power consumption is increased as the remaining battery level is decreased.

Control unit 624 holds a threshold for power consumption. FIGS. 10(a)-(b) show the data structure of the table held in the n+1th fire alarm 600n+1. FIG. 10(a) shows conditions for power consumption and thresholds, and operations according to the conditions. The control unit 624 decides to transmit a notification indicating an increase in power consumption when the power consumption exceeds the threshold. On the other hand, the control unit 624 determines not to send the notification when the power consumption is equal to or less than the threshold. FIG. 10(b) will be described later and returns to FIG. The communication unit 620 of the n+1th fire alarm 600n+1 transmits the notification to the n+3th fire alarm 600n+3 when transmission of the notification is determined.

The control unit 624 of the (n+3)th fire alarm 600n+3 determines the relay route based on the official route cost of Equation (2), as described above. The control unit 624 controls the values of the coefficients Ka and Kb in Equation (2) depending on whether or not the notification from the (n+1)th fire alarm 600n+1 is received. FIGS. 11(a)-(b) show the data structures of tables held in the 1n+3 fire alarm 600n+3. FIG. 11(a) shows the values of the coefficients Ka and Kb when no notification is received and when the notification is received. The coefficients Ka and Kb have a relationship of "1" when added.

If no notification has been received, the coefficient Ka is "A1" and the coefficient Kb is "B1". This also includes the case of (2-1) formation of a relay route when no notification has been received. For example, "A1" is "1" and "B1" is "0". Therefore, if no notification has been received, the three items on the right hand side of equation (2) are ignored.

If notification is received, the coefficient Ka is "A2" and the coefficient Kb is "B2". Since "B2" is a value greater than "0", "A2" is a value less than "1". Here, A2>B2 may be satisfied, A2=B2 may be satisfied, or A2<B2 may be satisfied. Therefore, when the notification is received, the influence of the three items on the right side of Equation (2) increases, and the formal route cost increases compared to when the notification is not received. As a result, the first relay route including the (n+1)-th fire alarm 600n+1 is less likely to be selected. That is, the n+3th fire alarm 600n+3 makes it difficult to select the first relay route including the n+1th fire alarm 600n+1 when receiving the notification from the n+1th fire alarm 600n+1.

The two items on the right side of the formal route cost shown in Equation (2) are "Ka×Max (link quality)", which is an index according to the link quality information with the n+1 fire alarm 600n+1 (hereinafter referred to as (referred to as the “first index”). The three items on the right side of the formal root cost shown in Equation (2) are "Kb×C", which is an index (hereinafter referred to as "second index") corresponding to the power consumption of the n+1th fire alarm 600n+1. It can be said that there is. When receiving the notification, the control unit 624 makes it difficult to select the first relay route by increasing the influence of the second index on the formal route cost. Such processing is performed with other fire alarm devices 600 as well.

So far, the values of the coefficients Ka and Kb are adjusted in two steps. However, the values of the coefficients Ka and Kb may be adjusted in three or more stages. FIG. 10(b) shows conditions for power consumption and thresholds, and operations according to the conditions. The controller 624 of the (n+1)-th fire alarm 600n+1 defines a first threshold and a second threshold larger than the first threshold as thresholds for power consumption. Control unit 624 determines to transmit a first notification indicating an increase in power consumption when the power consumption is greater than the first threshold and equal to or less than the second threshold. The control unit 624 decides to transmit a second notification indicating a further increase in power consumption when the power consumption becomes greater than the second threshold. On the other hand, the control unit 624 determines not to transmit the first notification and the second notification when the power consumption is equal to or less than the first threshold. Return to FIG. The communication unit 620 of the n+1th fire alarm 600n+1 transmits the first notification to the n+3th fire alarm 600n+3 when transmission of the first notification is determined. When transmission of the second notification is determined, the communication unit 620 transmits the second notification to the (n+3)-th fire alarm 600n+3.

The control unit 624 of the n+3th fire alarm 600n+3 adjusts the values of the coefficients Ka and Kb in Equation (2) according to whether or not the first notification or the second notification from the n+1th fire alarm 600n+1 is received. Control. FIG. 11(b) shows the values of the coefficients Ka and Kb when the first notification and the second notification are not received and when the first notification or the second notification is received. Also here, the coefficients Ka and Kb have a relationship of "1" when added.

When the first notification and the second notification have not been received, the coefficient Ka is "A1" and the coefficient Kb is "B1". For example, "A1" is "1" and "B1" is "0". When the first notification is received, the coefficient Ka is "A2" and the coefficient Kb is "B2". When the second notification is received, the coefficient Ka is "A3" and the coefficient Kb is "B3". "B3" is a value greater than "B2", and "A3" is a value less than "A2". That is, the control unit 624 increases the influence of the second index on the formal route cost when receiving the second notification from the n+1th fire alarm 600n+1 than when receiving the first notification from the n+1 fire alarm 600n+1.

(3) Construction Techniques for facilitating construction of the multi-hop network of the alarm system 1000 will now be described. In particular, a technique for providing information on where to install the fire alarm 600 will be described. 12(a)-(b) show an overview of the installation of the alarm system 1000. FIG. FIG. 12(a) shows a first example. Alarm system 1000 includes external device 900 in addition to the configuration of FIG. The external device 900 is, for example, a computer, and can communicate with the management device 800 .

The routing of the multi-hop network is not done after all fire alarms 600 are installed, but after several fire alarms 600 are installed near relay device 700 . After the routing for several fire alarms 600 is completed, the routing is updated after several more fire alarms 600 are installed. Thus, the routing is updated according to the number of fire alarms 600 increased in stages.

Here, it is assumed that the n+1th fire alarm 600n+1 and the n+2th fire alarm 600n+2 are installed before the n+3th fire alarm 600n+3 is installed. Each of the (n+1)-th fire alarm 600n+1 and the (n+2)-th fire alarm 600n+2 derives the formal route cost through the above-described processing, and then selects a relay route based on the formal route cost. The communication unit 620 of each of the n+1th fire alarm 600n+1 and the n+2th fire alarm 600n+2 transmits information about the relay route. Information about relay routes includes formal route costs. The information about the relay route may also include official route costs for relay routes other than the selected relay route, such as alternative routes.

The relay route information transmitted from the n+1th fire alarm 600n+1 and the n+2th fire alarm 600n+2 is transferred along the relay route and received by the relay device 700. FIG. Relay device 700 transmits information about the relay route to management device 800 . The management device 800 receives information about relay routes.

FIG. 13 shows the configuration of the external device 900. As shown in FIG. The external device 900 is, for example, a personal computer or a tablet terminal device. The external device 900 includes a communication section 902 , a control section 904 and a display section 906 . The communication unit 902 executes communication processing for communicating with the management device 800 . A builder operates the external device 900 to access the management device 800 , and the communication unit 902 receives information about the relay route from the management device 800 . Control unit 904 generates a screen based on the information about the relay route, and displays the generated screen on display unit 906 .

FIG. 14 shows a screen displayed on the display unit 906. As shown in FIG. As information about the relay route, identification information, cost, etc. of each fire alarm 600 are displayed. The builder checks the status of the relay route by checking the information about the relay route displayed on the display unit 906 .

The builder additionally installs the n+3th fire alarm 600n+3 as a new fire alarm 600 in the multi-hop network. A plurality of fire alarms 600, including the n+1th fire alarm 600n+1, the n+2th fire alarm 600n+2, and the n+3th fire alarm 600n+3, update the official route cost by adding a new fire alarm 600, and update the official route Update the relay route based on the cost. The communication unit 620 of each of the multiple fire alarms 600 transmits information about relay routes. As before, the management device 800 receives information about the relay route, and the external device 900 displays the updated information about the relay route.

FIG. 12(b) shows a second example. The alarm system 1000 includes an external device 910 and an information processing device 912 in addition to the configuration of FIG. External device 910 is a communication device capable of receiving signals transmitted from fire alarm 600 and relay device 700 . The information processing device 912 is a computer, for example, and is connected to the external device 910 . The same processing as before is performed in the multi-hop network. The external device 910 receives information about the relay route, and the information processing device 912 is, for example, a personal computer or a tablet terminal device. The information processing device 912 displays information about the updated relay route.

The derivation of formal root costs may be initiated or terminated as directed by the builder. For example, when a builder operates an operation unit (not shown) provided in the external device 900 or the information processing device 912, the external device 900 or the external device 910 instructs each fire alarm 600 to search for a relay route. You may send. At that time, each of the plurality of fire alarms 600 starts deriving the cost when receiving an instruction to search for a relay route from the external device 900 or 910 .

When a plurality of fire alarm devices 600 are searching for a relay route, when a builder operates an operation unit (not shown) provided in the external device 900 or the information processing device 912, the external device 900 or the external device 910 , an instruction to end the search for the relay route may be sent to each fire alarm device 600 . At that time, each of the plurality of fire alarms 600 ends deriving the cost when it receives from the external device 900 or the external device 910 an instruction to end searching for the relay route.

Each fire alarm 600 may be provided with an operation unit (not shown) that receives instructions from the installer. Each of the plurality of fire alarms 600 starts deriving the cost when receiving an instruction to search for a relay route. Further, each of the plurality of fire alarms 600 ends the derivation of the cost when it receives an instruction to end the relay route search.

(4) Time Slot Allocation Modification As described above, each fire alarm 600 should be allocated a time slot 1030 according to the number of hops between the relay device 700 and the fire alarm 600 . However, in the construction of the alarm system 1000, allocation may not be made according to the number of hops. Such allocation of the time slots 1030 may increase the transfer delay of communication signals. Here, after construction of the alarm system 1000, a process of correcting the allocation when the allocation according to the number of hops is not performed during the operation of the alarm system 1000 will be described.

15(a)-(b) show the configuration of part of the alarm system 1000. FIG. FIG. 15( a ) shows the configuration of the first stage of the alarm system 1000 . A multi-hop network is formed by connecting the m+1-th fire alarm 600m+1 to the relay device 700 and connecting the m+2-th fire alarm 600m+2 to the m+1-th fire alarm 600m+1. The number of hops between the relay device 700 and the (m+1)th fire alarm 600m+1 is "1", and the number of hops between the relay device 700 and the (m+2)th fire alarm 600m+2 is "2".

FIG. 16 shows an outline of downstream communication in the alarm system 1000. FIG. "M" indicates the time slot 1030 assigned to the relay device 700, "S1" indicates the time slot 1030 assigned to the m+1th fire alarm 600m+1, and "S2" indicates the time slot 1030 assigned to the m+2th fire alarm 600m+2. time slot 1030 is shown. As before, the time slot 1030 on the front side is assigned to the fire alarm 600 with the smaller number of hops.

Repeater 700 transmits a communication signal in time slot 1030 "M", and m+1 th fire alarm 600m+1 receives the communication signal in time slot 1030 "M". The m+1th fire alarm 600m+1 transmits a communication signal in time slot 1030 "S1", and the m+2th fire alarm 600m+2 receives a communication signal in time slot 1030"S1". The m+2 th fire alarm 600m+2 transmits a communication signal in time slot 1030 "S2". In the above description, the description of transmission and reception of the response signal is omitted.

FIG. 15(b) shows the configuration of the second stage of the alarm system 1000. FIG. This configuration is obtained by adding an (m+3)-th fire alarm 600m+3 to FIG. 15(b). By connecting the m+3-th fire alarm 600m+3 to the relay device 700, connecting the m+1-th fire alarm 600m+1 to the m+3-th fire alarm 600m+3, and connecting the m+2-th fire alarm 600m+2 to the m+1-th fire alarm 600m+1, A multi-hop network is formed.

17(a) and (b) show an overview of downstream communication in the alarm system 1000. FIG. Time slot 1030 "S3" in FIG. 17(a) is positioned after time slot 1030 "S2". Also, the time slot 1030 "S3" is assigned the newly added m+3-th fire alarm 600m+3.

Repeater 700 transmits communication signals in time slot 1030 "M", and m+3 th fire alarm 600m+3 receives communication signals in time slot 1030 "M". The m+3th fire alarm 600m+3 transmits communication signals in time slot 1030 "S3", and the m+1th fire alarm 600m+1 receives communication signals in time slot 1030"S3". The m+1th fire alarm 600m+1 transmits a communication signal in time slot 1030 "S1" in the next frame 1020, and the m+2th fire alarm 600m+2 receives a communication signal in time slot 1030"S1". The m+2 th fire alarm 600m+2 transmits a communication signal in time slot 1030 "S2".

That is, for the m+3-th fire alarm 600m+3 whose hop count to the relay device 700 is “1”, the time slot 1030 “S1” assigned to the m+1-th fire alarm 600m+1 whose hop count is “2” There is a delay in the transfer because a later time slot 1030 "S3" is assigned. Also in the above explanation, the explanation of the transmission and reception of the response signal is omitted.

In order to suppress such a transfer delay, the allocation is changed in the relay device 700 or the management device 800 after the addition of the (m+3)-th fire alarm 600m+3. For example, in downlink communication, when time slot 1030 "S1" and time slot 1030 "S2" are arranged before time slot 1030 "S3", allocation section 722 of relay device 700 assigns time slot 1030 "S1". and time slot 1030 "S2" are reallocated to be located after time slot 1030 "S3". Downlink communication is communication on a downlink, and signals are transferred in a direction away from relay device 700 in a multi-hop network.

Further, in uplink communication, when the time slot 1030 "S1" and the time slot 1030 "S2" are arranged behind the time slot 1030 "S3", the allocation unit 722 assigns the time slot 1030 "S1" and the time slot A re-assignment is made so that 1030 "S2" is placed before time slot 1030 "S3". Uplink communication is communication on the uplink, and signals are transferred in a direction approaching relay device 700 in the multi-hop network.

Each fire alarm 600 is given an identification number for identifying the fire alarm 600 . The identification number is assigned, for example, in order of construction. Therefore, in FIG. 15B, the m+3-th fire alarm 600m+3 with the identification number "3", the m+1-th fire alarm 600m+1 with the identification number "1", and the m+2-th fire alarm 600m+2 with the identification number "2" are arranged in this order. be done. When managing a plurality of fire alarms 600, it is preferable to arrange the identification numbers in the order in which the fire alarms 600 are arranged along the relay route. Relay device 700 or management device 800 determines the identification number of each fire alarm 600 according to the number of hops. In FIG. 15(b), the m+3-th fire alarm 600m+3 is assigned an identification number "1", the m+1-th fire alarm 600m+1 is assigned an identification number "2", and the m+2-th fire alarm 600m+2 is assigned an identification number. A number "3" is given.

The subject of an apparatus, system, or method in this disclosure comprises a computer. The main functions of the device, system, or method of the present disclosure are realized by the computer executing the program. A computer has a processor that operates according to a program as its main hardware configuration. Any type of processor can be used as long as it can implement functions by executing a program. The processor is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or LSI (Large Scale Integration). A plurality of electronic circuits may be integrated on one chip or may be provided on a plurality of chips. A plurality of chips may be integrated into one device, or may be provided in a plurality of devices. The program is recorded in a non-temporary recording medium such as a computer-readable ROM, optical disk, hard disk drive, or the like. The program may be pre-stored in a recording medium, or may be supplied to the recording medium via a wide area network including the Internet.

According to this embodiment, the relay route with the lower cost is preferentially selected. An increase in power consumption in the fire alarm 600 included in the multi-hop network can be suppressed. Also, the cost is derived based on the first index corresponding to the link quality information and the second index corresponding to the power consumption of the other fire alarm device 600, and the notification is received from the other fire alarm device 600. In this case, the effect of the second index on the cost is increased, so that it becomes difficult to select a relay route including other fire alarms 600 . Moreover, since the cost is changed only by increasing the influence of the second index, the processing can be simplified. Further, a first threshold and a second threshold are defined as thresholds for power consumption, and the cost is reduced according to the magnitude of power consumption with respect to the first threshold and the second threshold. Since the influence of the second index is changed, the relay route selection can be set in detail. Moreover, since the power consumption is derived based on the communication frequency, the power consumption can be easily estimated. Also, since the power consumption is derived based on the number of other fire alarms 600 that communicate directly, the power consumption can be easily estimated. Moreover, since the power consumption is derived based on the remaining battery level of the fire alarm 600, the power consumption can be easily estimated.

In addition, since each of the plurality of fire alarms 600 transmits information about the relay route to the external device 900 or 910, it is possible to determine where the fire alarms 600 should be installed when constructing a multi-hop network. Can provide information for decision making. In addition, since information for determining where to install the fire alarm 600 is provided, construction of a multi-hop network can be facilitated. Further, when a new fire alarm device 600 is added, each of the plurality of fire alarm devices 600 updates the information on the relay route and transmits the updated information to the external device 900 or the external device 910. It is possible to provide information for determining where to install the fire alarm 600 . Also, since the information about the relay route includes the cost, it is possible to easily grasp the routing situation. Further, since the information about the relay route is displayed on the external device 900, it is possible to easily check the information about the relay route.

In addition, each of the plurality of fire alarms 600 starts deriving costs when it receives an instruction to search for a relay route from the external device 900 or 910, so it is possible to give a trigger to start deriving costs. Further, each of the plurality of fire alarms 600 terminates cost derivation upon receiving an instruction to end searching for a relay route from the external device 900 or 910, so that it is possible to provide a trigger for ending cost derivation. In addition, each of the plurality of fire alarms 600 starts deriving costs when an instruction to search for a relay route is received in the operation unit, so it is possible to give a trigger to start deriving costs. Further, each of the plurality of fire alarms 600 ends the cost derivation when receiving an instruction to end the search for the relay route in the operation unit, so that the trigger for ending the cost derivation can be given.

In addition, since the order of the time slots 1030 assigned to each fire alarm 600 is determined according to the number of hops between the fire alarm 600 and the relay device 700, the transfer delay time in the multi-hop network can be shortened. Further, in downlink communication, the larger the number of hops of the fire alarm 600, the more the time slot 1030 on the rear side is assigned, so the transfer delay time in the multi-hop network can be shortened. Further, in upstream communication, the larger the number of hops of the fire alarm 600, the more forward time slots 1030 are assigned, so the transfer delay time in the multi-hop network can be shortened.

Also, in downstream communication, if a fire alarm 600 with a large number of hops is assigned to the front time slot 1030, the fire alarm 600 is changed to be assigned to the rear time slot 1030, resulting in a transfer delay. Save time. Also, in upstream communication, if a fire alarm 600 with a large number of hops is assigned to the rear time slot 1030, the fire alarm 600 is changed to be assigned to the front time slot 1030, resulting in a transfer delay. Save time.

Also, since the allocation change is made after the alarm system 1000 is installed, the number of allocation changes can be reduced. Also, since the identification number of the fire alarm 600 is determined according to the number of hops, the management of the fire alarm 600 can be facilitated. Since allocation is performed in the relay device 700, the relay device 700 can manage the allocation. Moreover, since the allocation is executed in the management device 800, the management device 800 can manage the allocation.

A summary of one aspect of the disclosure may be presented by the following headings.
(Item 1-1)
A plurality of alarm devices (600) forming a multi-hop network spreading from a relay device (700),
The plurality of alarms (600) includes a first alarm (600), a second alarm (600), and a third alarm (600);
The third alarm (600) is communicable with the first alarm (600) and the second alarm (600),
The third alarm (600) communicates with the relay device (700) via the first alarm (600) by exchanging link quality information with the first alarm (600). through said second alarm (600) by deriving a first cost for a first relay route for communicating and exchanging link quality information with said second alarm (600); deriving a second cost for a second relay route for communicating with the relay device (700);
The third alarm device (600) preferentially selects the first relay route when the first cost is smaller than the second cost,
When the power consumption in the first alarm device (600) becomes greater than a threshold, the first alarm device (600) notifies the third alarm device (600) of the increase in power consumption. send to
The third alarm device (600) makes it difficult to select the first relay route when receiving the notification from the first alarm device (600),
Alarm system (1000).

(Item 1-2)
The third alarm device (600) provides a first index according to link quality information with the first alarm device (600) and a second index according to the power consumption of the first alarm device (600). The first cost is derived based on
The third alarm (600) selects the first relay route by increasing the influence of the second indicator on the first cost when receiving the notification from the first alarm (600). An alarm system (1000) according to item 1-1.

(Item 1-3)
The first alarm device (600) defines a first threshold value and a second threshold value larger than the first threshold value as threshold values for power consumption,
When power consumption in the first alarm (600) becomes greater than the first threshold, the first alarm (600) transmits a first notification to the third alarm (600). death,
When the power consumption in the first alarm (600) becomes greater than the second threshold, the first alarm (600) sends a second notification to the third alarm (600). death,
When the third alarm device (600) receives the second notification than when the first notification is received from the first alarm device (600), the influence of the second indicator on the first cost The alarm system (1000) according to (item 1-2).

(Item 1-4)
The first alarm device (600) derives the power consumption based on the communication frequency of the first alarm device (600),
The alarm system (1000) according to any one of (items 1-1) to (items 1-3), wherein the first alarm device (600) increases the power consumption as the communication frequency increases.

(Item 1-5)
The first alarm device (600) derives the power consumption based on the number of other alarm devices (600) with which the first alarm device (600) directly communicates,
According to any one of (item 1-1) to (item 1-3), the first alarm device (600) increases the power consumption as the number of the other alarm devices (600) increases. alarm system (1000).

(Item 1-6)
The first alarm device (600) derives the power consumption based on the remaining battery level of the first alarm device (600),
The alarm system (1000) according to any one of (items 1-1) to (items 1-3), wherein the first alarm device (600) increases the power consumption as the remaining battery level decreases. .

(Item 1-7)
The alarm according to any one of (items 1-1) to (items 1-6), wherein the third alarm device (600) makes it difficult to select the first relay route when a user operation is received. System (1000).

(Item 1-8)
An alarm device (600) among a plurality of alarm devices (600) forming a multi-hop network spreading from a relay device (700),
a communication unit (620) capable of communicating with a first alarm device (600) and a second alarm device (600) among the plurality of alarm devices (600);
To communicate with the relay device (700) via the first alarm device (600) by exchanging link quality information with the first alarm device (600) by the communication unit (620) while deriving the first cost for the first relay route of the second alarm device (600) by exchanging link quality information with the second alarm device (600) by the communication unit (620) after deriving a second cost for a second relay route for communicating with the relay device (700) via , and then preferring the first relay route if the first cost is less than the second cost. and a control unit (624) that selects by
The communication unit (620) receives a notification indicating an increase in power consumption from the first alarm device (600) when the power consumption in the first alarm device (600) exceeds a threshold value. death,
The control unit (624) makes it difficult to select the first relay route when the communication unit (620) receives the notification from the first alarm device (600).
Alarm (600).

(Item 1-9)
A relay route setting method in an alarm device (600) among a plurality of alarm devices (600) forming a multi-hop network spreading from a relay device (700),
The alarm (600) is communicable with a first alarm (600) and a second alarm (600) of the plurality of alarms (600);
A first relay route for a first relay route for communicating with the relay device (700) via the first alarm device (600) by exchanging link quality information with the first alarm device (600). 1 to communicate with said repeater (700) via said second alarm (600) by deriving a cost and exchanging link quality information with said second alarm (600). deriving a second cost for a second relay route of
preferentially selecting the first relay route when the first cost is less than the second cost;
receiving a notification from the first alarm device (600) indicating an increase in power consumption when the power consumption in the first alarm device (600) becomes greater than a threshold;
making it difficult to select the first relay route when receiving the notification from the first alarm device (600);
A relay route setting method comprising:

(Item 1-10)
A program to be executed by an alarm device (600) among a plurality of alarm devices (600) forming a multi-hop network extending from a relay device (700),
The alarm (600) is communicable with a first alarm (600) and a second alarm (600) of the plurality of alarms (600);
A first relay route for a first relay route for communicating with the relay device (700) via the first alarm device (600) by exchanging link quality information with the first alarm device (600). 1 to communicate with said repeater (700) via said second alarm (600) by deriving a cost and exchanging link quality information with said second alarm (600). deriving a second cost for a second relay route of
preferentially selecting the first relay route when the first cost is less than the second cost;
receiving a notification from the first alarm device (600) indicating an increase in power consumption when the power consumption in the first alarm device (600) becomes greater than a threshold;
and making a computer difficult to select the first relay route when receiving the notification from the first alarm device (600).

(Item 2-1)
A plurality of alarm devices (600) forming a multi-hop network spreading from a relay device (700),
Each of the plurality of alarm devices (600) exchanges link quality information with the other surrounding alarm devices (600) so that the relay via the other surrounding alarm devices (600) After deriving a cost for a relay route for communicating with a device (700), selecting a relay route based on the cost;
each of the plurality of alarm devices (600) transmits information on relay routes to an external device;
Alarm system (1000).

(Item 2-2)
in the multi-hop network, a new alarm (600) is added to the plurality of alarms (600);
The plurality of alarm devices (600) updates the cost by adding the new alarm device (600), updates the relay route based on the updated cost,
Each of the plurality of alarm devices (600) transmits information on the updated relay route to the external device (item 2-1) in the alarm system (1000).

(Item 2-3)
The alarm system (1000) according to (item 2-1) or (item 2-2), wherein the information on the relay route includes costs.

(Item 2-4)
The alarm according to any one of (items 2-1) to (items 2-3), wherein the information about the relay route transmitted from each of the plurality of alarm devices (600) is displayed on the external device. System (1000).

(Item 2-5)
Each of the plurality of alarm devices (600) starts deriving a cost upon receiving an instruction to search for a relay route from the external device, any one of (items 2-1) to (items 2-4) 10. An alert system (1000) according to claim 1.

(Item 2-6)
Each of the plurality of alarm devices (600) terminates cost derivation upon receiving an instruction to terminate searching for a relay route from the external device, any one of (item 2-1) to (item 2-4). An alarm system (1000) according to any one of claims 1 to 3.

(Item 2-7)
The alarm according to any one of (items 2-1) to (items 2-4), wherein each of the plurality of alarm devices (600) starts deriving a cost when receiving an instruction to search for a relay route. System (1000).

(Item 2-8)
Each of the plurality of alarm devices (600) according to any one of (items 2-1) to (items 2-4), when receiving an instruction to end searching for a relay route, terminates cost derivation. Alarm system (1000).

(Item 2-9)
An external device (900, 910) capable of communicating with a plurality of alarm devices (600) forming a multi-hop network extending from a relay device (700),
Each of the plurality of alarm devices (600) exchanges link quality information with the other surrounding alarm devices (600) so that the relay via the other surrounding alarm devices (600) After deriving the cost for the relay route for communicating with the device (700), the relay route is selected based on the cost, and information on the relay route from each of the plurality of alarm devices (600) is obtained. a communication unit (902) for receiving;
a display unit (906) for displaying information about the relay route received by the communication unit (902);
An external device (900, 910) comprising:

(Item 2-10)
A display method in an external device (900, 910) capable of communicating with a plurality of alarm devices (600) forming a multi-hop network extending from a relay device (700),
Each of the plurality of alarm devices (600) exchanges link quality information with the other surrounding alarm devices (600) so that the relay via the other surrounding alarm devices (600) After deriving the cost for the relay route for communicating with the device (700), the relay route is selected based on the cost, and information on the relay route from each of the plurality of alarm devices (600) is obtained. receiving;
displaying information about the received relay route;
A display method comprising

(Item 2-11)
A program to be executed by external devices (900, 910) capable of communicating with a plurality of alarm devices (600) forming a multi-hop network extending from a relay device (700),
Each of the plurality of alarm devices (600) exchanges link quality information with the other surrounding alarm devices (600) so that the relay via the other surrounding alarm devices (600) After deriving the cost for the relay route for communicating with the device (700), the relay route is selected based on the cost, and information on the relay route from each of the plurality of alarm devices (600) is obtained. receiving;
A program for causing a computer to execute a step of displaying information about the received relay route.

(Item 3-1)
A plurality of alarm devices (600) forming a multi-hop network spreading from a relay device (700),
The plurality of alarms (600) includes a first alarm (600) and a second alarm (600),
A first time slot of a plurality of time slots arranged on a time axis is assigned to the first alarm device (600), and the first alarm device (600) emits a signal in the first time slot. and send
The second alarm device (600) is assigned a second time slot of a plurality of time slots arranged on the time axis and different from the first time slot, said second alarm (600) transmitting a signal in said second time slot;
According to the first hop count between the first alarm device (600) and the relay device (700) and the second hop count between the second alarm device (600) and the relay device (700), the determining the order of the first time slot and the second time slot in a plurality of time slots;
Alarm system (1000).

(Item 3-2)
When the signal is transferred in the direction away from the relay device (700) in the multi-hop network, the second time slot is the first time slot if the second hop number is greater than the first hop number. An alarm system (1000) according to (item 3-1) arranged on the rear side.

(Item 3-3)
When the signal is transferred in the direction approaching the relay device (700) in the multi-hop network, the second time slot is the first time slot if the second hop number is greater than the first hop number. An alarm system (1000) according to (item 3-1) located on the front side.

(Item 3-4)
If the second time slot is arranged on the front side of the first time slot, the allocation is changed so that the second time slot is arranged on the rear side of the first time slot (item 3- 2) The alarm system (1000) according to 2).

(Item 3-5)
If the second time slot is arranged after the first time slot, the allocation is changed so that the second time slot is arranged before the first time slot (item 3- 3) The alarm system (1000) according to 3).

(Item 3-6)
The alarm system (1000) according to (item 3-4) or (item 3-5), wherein the allocation is changed after construction of the alarm system (1000).

(Item 3-7)
The identification numbers of the first alarm device (600) and the second alarm device (600) are determined according to the first hop count and the second hop count (items 3-1) to (items 3-1). The alarm system (1000) according to any one of -6).

(Item 3-8)
The alarm system (1000) according to any one of (item 3-1) to (item 3-7), wherein the relay device (700) performs allocation.

(Item 3-9)
Further comprising a management device connected to the relay device (700),
The alarm system (1000) according to any one of items 3-1 to 3-7, wherein the management device performs allocation.

(Item 3-10)
A control device for a plurality of alarm devices (600) forming a multi-hop network spreading from a relay device (700),
The plurality of alarm devices (600) includes a first alarm device (600) and a second alarm device (600), and the first alarm device (600) has a plurality of time slots arranged on a time axis. and assigning the second alarm device (600) a second time slot among a plurality of time slots arranged on the time axis, and the first time slot and an allocation unit that allocates different second time slots;
an output unit that outputs an allocation result in the allocation unit;
The allocating unit assigns a first hop count between the first alarm device (600) and the relay device (700) and a second hop count between the second alarm device (600) and the relay device (700). determining the order of the first time slot and the second time slot in the plurality of time slots according to
Control device.

(Item 3-11)
A method of assigning a plurality of alarm devices (600) constituting a multi-hop network extending from a relay device (700) in a control device,
The plurality of alarm devices (600) includes a first alarm device (600) and a second alarm device (600), and the first alarm device (600) has a plurality of time slots arranged on a time axis. and assigning the second alarm device (600) a second time slot among a plurality of time slots arranged on the time axis, and the first time slot and assigning a different second time slot;
and outputting the allocation result,
The allocating step includes a first hop number between the first alarm device (600) and the relay device (700) and a second hop number between the second alarm device (600) and the relay device (700). determining the order of the first time slot and the second time slot in the plurality of time slots according to
Allocation method.

(Item 3-12)
A program to be executed by a control device for a plurality of alarm devices (600) forming a multi-hop network extending from a relay device (700),
The plurality of alarm devices (600) includes a first alarm device (600) and a second alarm device (600), and the first alarm device (600) has a plurality of time slots arranged on a time axis. and assigning the second alarm device (600) a second time slot among a plurality of time slots arranged on the time axis, and the first time slot and assigning a different second time slot;
and outputting the allocation result,
The allocating step includes a first hop number between the first alarm device (600) and the relay device (700) and a second hop number between the second alarm device (600) and the relay device (700). A program for causing a computer to determine the order of said first time slot and said second time slot in said plurality of time slots according to.

The present disclosure has been described above based on the embodiments. It should be understood by those skilled in the art that this embodiment is an example, and that various modifications are possible in the combination of each component or each treatment process, and such modifications are within the scope of the present disclosure. .

The n+3th fire alarm 600n+3 of this embodiment makes it difficult to select the first relay route including the n+1th fire alarm 600n+1 when receiving the notification from the n+1th fire alarm 600n+1. However, not limited to this, for example, the (n+3)-th fire alarm 600n+3 makes it difficult to select the first relay route when receiving a user operation. User operations are received by, for example, the management device 800, the external device 900, the external device 910, and the fire alarm 600. FIG. According to this modification, the relay route can be changed according to the user's intention.

Each fire alarm 600 in this example exchanges link quality to determine relay routes. However, not limited to this, for example, each fire alarm 600 may exchange the value of power consumption. The value of power consumption is reflected in C in the third term on the right side of Equations (1) and (2). For example, "C" is increased as the value of power consumption increases. According to this modified example, the influence of power consumption can be reflected in the provisional route cost or the formal route cost.

600 fire alarm, 620 communication unit, 622 processing unit, 624 control unit, 630 fire detection sensor, 632 buzzer, 700 relay device, 710 communication unit, 712 output unit, 720 control unit, 722 allocation unit, 800 management device, 900 External device 902 Communication unit 904 Control unit 906 Display unit 910 External device 912 Information processing device 1000 Alarm system.

Claims (12)

Equipped with multiple alarms that form a multi-hop network spreading from the relay device,
The plurality of alarms includes a first alarm and a second alarm,
The first alarm device is assigned a first time slot of a plurality of time slots arranged on a time axis, and the first alarm device transmits a signal in the first time slot,
The second alarm device is assigned a second time slot that is a second time slot among a plurality of time slots arranged on the time axis and is different from the first time slot, the alarm transmits a signal in the second time slot;
According to the first hop count between the first alarm device and the relay device and the second hop count between the second alarm device and the relay device, the first time slot in the plurality of time slots and the the order of the second time slots is determined;
alarm system. If the second hop number is greater than the first hop number when the signal is transferred in the multi-hop network in a direction away from the relay device, the second time slot is positioned after the first time slot. 2. The alarm system of claim 1, wherein the alarm system is arranged. If the second hop count is greater than the first hop count, the second time slot is placed before the first time slot when the signal is forwarded in the direction of approaching the relay device in the multi-hop network. The alarm system of claim 1, wherein: 3. When said second time slot is placed before said first time slot, the allocation is changed so that said second time slot is placed after said first time slot. Alarm system as described. 4. The method according to claim 3, wherein when said second time slot is placed behind said first time slot, the allocation is changed so that said second time slot is placed before said first time slot. Alarm system as described. 6. An alarm system according to claim 4 or 5, wherein the change in allocation is made after installation of the alarm system. 7. The alarm system according to any one of claims 1 to 6, wherein identification numbers of said first alarm device and said second alarm device are determined according to said first hop count and said second hop count. 8. An alarm system according to any one of claims 1 to 7, wherein the relay device performs allocation. further comprising a management device connected to the relay device;
8. An alarm system according to any preceding claim, wherein the management device performs allocation. A control device for a plurality of alarm devices forming a multi-hop network spreading from a relay device,
The plurality of alarm devices includes a first alarm device and a second alarm device, the first alarm device is assigned a first time slot among a plurality of time slots arranged on a time axis, and the first an allocating unit for allocating a second time slot, which is a second time slot among a plurality of time slots arranged on the time axis and which is different from the first time slot, to the second alarm device;
an output unit that outputs an allocation result in the allocation unit;
The allocation unit performs the first hop count in the plurality of time slots according to a first hop count between the first alarm device and the relay device and a second hop count between the second alarm device and the relay device. determine the order of one time slot and the second time slot;
Control device. A method of assigning a plurality of alarm devices to a plurality of alarm devices that constitute a multi-hop network spreading from a relay device in a control device,
The plurality of alarm devices includes a first alarm device and a second alarm device, the first alarm device is assigned a first time slot among a plurality of time slots arranged on a time axis, and the first a step of allocating a second time slot, which is a second time slot among a plurality of time slots arranged on the time axis and which is different from the first time slot, to the second alarm device;
and outputting the allocation result,
The step of allocating includes performing the first hop number in the plurality of time slots according to a first hop number between the first alarm device and the relay device and a second hop number between the second alarm device and the relay device. determine the order of one time slot and the second time slot;
Allocation method. A program to be executed by a control device for a plurality of alarm devices constituting a multi-hop network spreading from a relay device,
The plurality of alarm devices includes a first alarm device and a second alarm device, the first alarm device is assigned a first time slot among a plurality of time slots arranged on a time axis, and the first a step of allocating a second time slot, which is a second time slot among a plurality of time slots arranged on the time axis and which is different from the first time slot, to the second alarm device;
and outputting the allocation result,
The step of allocating includes performing the first hop number in the plurality of time slots according to a first hop number between the first alarm device and the relay device and a second hop number between the second alarm device and the relay device. A program for causing a computer to determine the order of one time slot and said second time slot.

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