JP2006019796A - Wireless routing system and street light fault monitor system utilizing this system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem of a conventional multi-hop network system in terms of operation. <P>SOLUTION: A neighboring terminal determination process and a relay transmission confirmation process determine a communication route between a plurality of terminals N2 to N5 and a destination terminal N1. The neighboring terminal determination process is a process wherein the respective terminals N2 to N5 make wireless communication with each other to call their neighboring terminals, sequentially determine terminals making a reply in response to the call, and capture information of the replied terminals and store them to routing information of their own terminals. The relay transmission confirmation process is a process whereby the respective terminals N2 to N5 respectively request the neighboring terminals determined by the neighboring terminal determination process to a relay a call to other terminals by designating a destination, particularizes a relay terminal replying its call, and determine a communication route to the destination terminal. For example, the terminal 5 transmits information to the destination terminal N1 via the determined communication route. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a wireless routing system that performs wireless communication by determining a relay route from its own terminal to another specific terminal by wireless communication, and a street light failure monitoring system using this system.

  Mesh networks have many advantages over single-hop networks and are expected to be used in a variety of environments such as home, business, public space, and telecommunications service industries. In FIG. 13A, according to the mesh network, even if there is no link between the node 1 and the node 2, the node 3 can mediate transmission from the node 1 to the node 2. Further, even if a failure occurs in a certain node (for example, node 4) as shown in (b), transmission can be continued while avoiding the failed node 4 through another communication route. Further, as shown in (c), a new node can be added without changing the configuration of the existing network. Further, if a relay node is used as shown in (d), an effect that transmission power can be suppressed is expected.

  However, various problems have been pointed out in actual operation. First, power is consumed by transferring the traffic of other nodes, second, there is a problem with the security of the node that relays the traffic, and third, if the node arrangement is not designed, As shown in FIG. 14 (a), there is a possibility that traffic will be concentrated from a large number of nodes in one node. Fourth, as the number of nodes increases, each node will receive network control information such as position and link status. Exchange cases occur frequently, and the amount of data cannot be ignored. For this reason, problems such as the risk of the network becoming unstable have been pointed out.

  Above all, the fourth problem is serious. In actual operation, as shown in FIG. 14 (b), each node can use up data only by exchanging network control information (routing information) such as position and link status, and it is important to transmit to other nodes. This leaves no room for communication of the transmission information data that is the content.

  The biggest reason why such a problem occurs is that a mesh network is also called a multi-hop network, but the biggest reason why such a problem occurs is that the conventional multi-hop network is a single-hop network system. It seems that it was because it was considered as a similar concept. In a single-hop network, for example, a wireless LAN, multiple clients connect directly to a single access point to access the network. On the other hand, the conventional multi-hop network concept has a wireless link function. Any installed device is meant to be built into a system that can act as a router or access point.

  That is, if the nearest access point is congested, the data is routed to the next nearby low traffic volume node, and the data continues to hop from one node to the other, leaving the final node. This concept only replaces the concept of the Internet with wireless as it is. In such a system, as the number of nodes increases, the routing information becomes larger in capacity as in the Internet. As a result, the network for essential information communication cannot be constructed more than the network becomes unstable.

Apart from this, the maintenance and management of street lamps has traditionally been left exclusively to visual inspections by security guards. In other words, it is a system in which the presence or absence of a street lamp is visually inspected, and if the street lamp is extinguished, the street lamp maintenance manager is notified for repair. However, with such a method, even if there is an abnormality in the street light unless there is a security officer's look around, you will not be able to notice the abnormality, but the street light will only light at night, so check visually during the day. However, it is difficult to discover abnormalities and equipment consumption. If street lights are left off, there is a risk of accidents and crimes in the dark.
Patent Publication 2003-69620 NIKKEI ELECTRONICS 2004. 3.15 P65-70 “Mesh network with increased momentum in practical use in the US” Construction of wireless environment by mesh network technology (http://www.intel.co.jp/jp/developer/update/contents/nc11032.htm)

  The problem to be solved is that the conventional multi-hop network is merely a system in which the Internet is simply wireless, and cannot be realized due to an actual operational problem.

  The present invention does not set a specific access point, does not determine a communication route when the system is driven, and wirelessly communicates with each other as nodes, or by intercepting communication contents of neighboring terminals While establishing a relay terminal from its own terminal to the destination terminal, determine the optimum route between terminals, especially between the slave unit and the master unit terminal, or from the master unit terminal to all the slave unit terminals, and further establish a communication route. The most important feature is that the optimum route is updated while monitoring.

  According to the wireless routing system of the present invention, the amount of network control information between nodes does not increase and the network does not become unstable unlike the conventional network system, so that it cannot be realized due to actual operational problems. In addition, by forming a closed specific network for communication to fixed stations, it is possible to reduce the amount of routing information communication that usually causes complicated and large capacity, as much as possible. It can be expected to have tremendous effects in ensuring the safety of the city, the work of the street light maintenance manager and the cost saving by applying it to various information communication, especially the street light failure monitoring system.

  The outline of the wireless routing system according to the present invention will be described below. Routing usually means finding a route to reach a transmission destination on the network. However, in the present invention, direct communication between two points where direct communication is impossible is possible. This means that when relay points are set at several locations and relay transmission is enabled, the relay route is determined by determining which relay point route (communication route) allows communication between two points. Shall. The routing information means information on a communication route from each terminal to a destination terminal that is a final transmission destination directly or via a relay point.

(1) Routing In FIG. 1A, when the terminal N1 and the terminal N2 are separated and direct communication is not possible between the terminal N1 and the terminal N2, as shown in FIG. The terminal N3 is placed at a position where communication is possible between adjacent terminals on the communication route connecting N1 and the terminal N2, and terminals N4 and N5 are placed at positions where communication is possible between adjacent points via a bypass route connecting the terminal N1 and the terminal N2. The terminal N1 and the terminal N2 communicate with each other through a first communication route connecting the terminal N1-terminal N3-terminal N2 and a second communication route connecting the terminal N1-terminal N4-terminal N5-terminal N2. It becomes possible. In this case, the first communication route has a smaller communication load (less hops) than the second communication route. In principle, a communication route that minimizes the communication load is selected between terminals.

  In the present invention, the communication route is a communication route for connecting one or more parent device terminals from a parent device terminal that is a destination fixed station and a child device terminal, that is, two or more child device terminals, or 1 A case is assumed in which a communication route for connecting two or more child device terminals is selected from two or more parent device terminals. In the present invention, the communication route is determined when a relay path between an arbitrary slave terminal and the terminal of the master terminal that is a fixed station is determined. Although it is possible to determine the communication route between the slave terminals, further logic may be required depending on the case.

  A communication route (relay route) between a plurality of terminals (child device terminals) and a destination terminal (master device terminal) is determined by a neighboring terminal determination process and a relay transmission confirmation process. When the destination terminal is a master terminal, the plurality of terminals are slave terminals that serve as information transmission sources or relay points of communication routes, and when the destination terminal is a specific slave terminal, either directly or from the master terminal Information is transmitted via other slave terminals.

  FIG. 2 (a) shows that the system is in an initial state, and two or more terminals N1 to N5 are distributed in various places as a parent terminal or a child terminal, but each terminal has no routing information. It shows a state that is not. In the following, the procedure for establishing a communication route between terminals with the terminal N1 as a master terminal and the other terminals N2 to N5 as slave terminals will be described.

(1) Neighboring terminal determination process In the initial state, the neighboring terminal determination process responds by determining that the terminals that have no routing information in the initial state communicate with each other wirelessly, call the neighboring terminals, and return the response to the call. This is a process of taking the information held by the terminal into the routing information of the terminal itself. In FIG. 2A, each terminal having no routing information in the initial state makes a call to all terminals to which radio signals reach. In this example, the terminal N1 transmits a radio signal with a constant strength and calls to the vicinity of the terminal N1. In this example, the terminal N1 is set as the parent device.

  In this call, the terminals N2 and N3 receive the radio signal of the terminal N1. In FIG.2 (b), the terminal which received the radio signal by the call of a certain terminal transmits the radio signal of fixed intensity in response to the call. From this response, the calling terminal recognizes that there is a terminal that responded in the vicinity, and the other terminals that received the response knew the presence of the terminal that called the terminal ahead of the responding terminal and responded Establish a communication route from the terminal to the first called terminal.

  In this example, the terminals N2 and N3 respond to the call from the terminal N1. From this response, the terminal (base unit) N1 recognizes that the terminals N2 and N3 exist in the vicinity, and the terminals N2 and N3 confirm that the terminal N1 exists in the vicinity. Further, when the terminal N4 intercepts the response of the terminal N3 to the terminal N1, the terminal N3 is present before the terminal N3, and the terminals N2 and N3 communicate directly with the terminal N1. The terminal N4 recognizes that the terminal N3 can be reached by relaying the terminal N3, and the terminal N1 recognizes that the terminals N2 and N3 exist in the vicinity. This operation is performed not only at the terminal N1, but also at the terminals N2, N3, and N4, respectively. This process allows each terminal to communicate with other terminals in the vicinity that can communicate directly or by relay. Confirm and store this as routing information of the terminal itself.

(2) Relay transmission confirmation process The relay transmission confirmation process is a relay that responds to a call to a neighboring terminal that has been confirmed by the neighboring terminal confirmation process by requesting a relay call to another terminal by specifying a destination. This is a process for identifying a terminal and determining a communication route to a destination terminal. In FIG. 2 (c), if a certain terminal can determine a neighboring terminal, it requests each terminal to make a relay call to another terminal. In this example, it has been found that the terminal N1 can directly communicate with the terminals N2 and N3. Therefore, the terminal N1 first calls the terminal N2, and requests the terminal N2 to relay to the terminal N4.

  The terminal requested to relay confirms whether there is routing information of the requested destination terminal in the routing information held by its own terminal. If the routing information of the destination terminal does not exist, other neighboring Request relay to the terminal. If there is no other terminal other than the terminal that has requested relaying, relay impossible (NG) is returned to the requesting terminal. If there is routing information of the destination terminal in the routing information held by the terminal itself, the terminal is selected and the relay terminal that can communicate with the requested terminal is requested to relay, and if the destination terminal is nearby, it is directly Send the request contents wirelessly.

  In FIG. 2D, since the terminal N2 is the only terminal that can communicate directly with the terminal N1, the terminal N2 responds to the terminal N1 with relay failure (NG). The terminal N1 that has received the NG of the terminal N2 next requests the terminal N3 to relay communication with the terminal N4. Since the terminal N3 stores the fact that the terminal N4 exists in the vicinity as the neighbor information, the terminal N3 transmits a call from the terminal N1 to the terminal N4.

  The terminal that received the call requests the terminal that relayed it to respond to the request source. In this example, the terminal N4 requests the terminal N3 to relay a response to the terminal N1. The terminal N3 that has received the request transmits the response of the terminal N4 to the terminal N1. The response of the terminal N4 to the terminal N3 is also received by the neighboring terminal N5, and then the terminal N5 relays the terminal N4 and establishes a communication route to the terminal N3 by the same operation.

  Thereby, the relay terminal to each terminal is determined, and as a result of both processes, the communication route of terminal N1-terminal N2 and the communication route of terminal N1-terminal N3-terminal N4-terminal N5 are determined. The communication route is constantly monitored. If the terminal N6 is newly added to the determined communication route of the terminals N1-N5 and communication between the terminals N6-N5 and N6-N1 is possible, the terminal N5 to the terminal The communication route to N1 is determined by changing from the previous terminal N5-N4-N3-N1 to a communication route with a smaller communication load (communication route with a smaller number of hops) terminal N5-N6-N1. Information to be transmitted to the destination (transmission information) is transmitted from a certain slave unit terminal to the master unit terminal P that is the destination terminal or from the base unit terminal P to the destination slave unit terminal via the determined communication route.

  An example in which the system of the present invention is applied to a street light failure monitoring system will be described below. The street light failure monitoring system is a system that detects failures including light bulbs, extinction of fluorescent lamps, and disconnection of all street lights installed in the city and reports the information to the monitoring server.

  FIG. 3 shows an installation example of street lamps installed along a city road (sidewalk) 1. Street lights are equipped with a terminal for detecting malfunctions including light bulbs, extinction of fluorescent lights, and disconnection, and reporting the information to the monitoring server. A street light is selected, and the base station terminal P is equipped as a fixed station of the destination, and the remaining street lights are equipped with handset terminals C1, C2, C3,. In FIG. 3, the display of the master terminal P and each slave terminal C1, C2, C3,... When any street light fails, the street light failure monitoring system transmits failure information from the terminal that detected the failure, relays the slave devices one after another, and sends failure information to the parent device terminal that is the destination. This is a system for transmitting street lamp failure information using a wireless routing system that transmits information to a parent device terminal directly from the child device terminal or relaying another child device terminal.

The terminal used in this system (common to the parent device terminal and the child device terminal) has a monitoring function 2, a communication function 3, and a failure notification function 4, as shown in FIG.
The monitoring function 2 is a failure detection function for detecting a street light failure, the communication function 3 is a route search function 5 and a relay function 6, and the route search function 5 is a final destination by transmitting and receiving radio signals. This is a function for searching for a communication route to the base terminal, and as described later, searches for a communication route spontaneously and monitors communication of other terminals.

  The relay function 6 is a function for requesting the base station terminal P to relay the transmission of communication data to the neighboring handset terminal determined based on the routing information stored in the own terminal. The failure notification function is a function of transmitting failure information detected by the monitoring function 2 to the communication function 3 and further wirelessly transmitting from the communication function 3.

  The communication header as transmission data control information includes a relay destination ID, a relay source ID, a hop counter, a transmission date and time, a transmission destination ID, a transmission source ID, the number of hops between the parent terminal and the own terminal. It is.

  The street light failure monitoring system includes a route search function 5 for determining a communication route between a plurality of child device terminals and the parent device terminal, a failure notification function 4 for reporting failure information through a communication route for which communication data is determined, It is realized by executing. The contents of each function will be described below in order.

(1) Route Search Function The route search function is a function that executes the above-described neighboring terminal determination process and relay transmission confirmation process by the “spontaneous route search function” and the “monitoring function of other terminal communication”. “Spontaneous route search function” voluntarily requests information from neighboring terminals when there is no routing information in its own terminal, adds information on neighboring terminals that responded to its own routing information, It is a function that requests a response from the master terminal to a neighboring terminal, waits for the response, and determines the communication route to the master terminal. This is a function that determines the routing information of other terminals by monitoring (intercepting) the communication, updates the routing information of the own terminal, and continues to accumulate it.

(1-1) Spontaneous route search function In FIG. 5, for simplification of description, the arrangement of a plurality of child device terminals C1 to C3 and the parent device terminal P is passed from the child device terminal C3 via C2-C1. The procedure for determining the communication route to the base terminal P will be described with a focus on the processing at the handset terminal C3. FIG. 5 illustrates the slave terminal C4, but it is assumed that the slave terminal C4 is not initially installed. In an initial state in which the slave terminals C1 to C3 are arranged, no routing information for connecting any of the slave terminals C1 to C3 including the master terminal P to the master terminal P (empty) State). FIG. 6 shows a flow of a spontaneous route search of the handset terminal.

  In FIG. 6, the slave terminal C3 first checks the presence / absence of routing information in its own terminal (step S1). When there is no routing information, a transmission signal of a certain strength is issued as a call to the neighbor without designating a communication partner, and a response is requested to the neighboring terminal (step S2). Similarly, the other handset terminals C2 and C1 use the route search function to search for routing information reaching the parent terminal P with the minimum number of hops. When there is a response (step S3) from a neighboring terminal to the call from the child device terminal C3, neighboring routing information is added to the child device terminal C3 (step S4).

  The example of FIG. 5 shows a case where there is a response from a nearby child device terminal C2 in response to a call from the child device terminal C3. If handset terminal C2 retains routing information that relays handset terminal C1 to base terminal P, it is determined whether or not the communication route to base terminal P can be determined (step S5). When it is determined that it can be determined, the routing information held by the slave terminal C2 is added to the slave terminal C3, and the communication route from the slave terminal C3 to the master terminal P via C2 and C1 is confirmed. The

  On the other hand, when the handset terminal C3 has routing information in step S1, a response from the base terminal P is requested to the neighboring terminal (step S6). In the example of FIG. 5, since the child device terminal C2 relays the child device terminal C1 and is connected to the parent device terminal P, the response (step S7) of the parent device terminal P passes through the child device terminals C1 and C2. Then, the information is transmitted to the child device terminal C3, and the communication route of the child device terminals C3-C2-C1-master device terminal P is determined (step S5). If there is no response from the parent terminal P in step S7, or if there is no response from the neighboring terminal (step S4) in step S3, after waiting for a predetermined time, the process returns to step S5 and returns to the parent terminal P. It is determined whether or not the communication route to be reached can be determined. If the communication route to the parent terminal P cannot be determined, the process returns to step S1 and a search for new routing information is started.

  FIG. 7 shows a flow of the spontaneous route search of the parent terminal P. Since the spontaneous route search performed by the parent device terminal P is almost the same as the spontaneous route search of the child device terminal, the corresponding steps will be described as the same steps as in FIG. 6, but the parent device terminal and the child device terminal will be described. Naturally, the method for obtaining routing information is different. That is, the child device terminal searches for a communication route from its own terminal to the parent device terminal P, but the parent device terminal P obtains routing information from the parent device terminal P to all the child device terminals.

  Therefore, in step S5, it is determined whether or not the route from the parent device terminal P to all the child device terminals has been determined. In step S6, a response is requested to a child device terminal adjacent to the parent device terminal P. . In the example of FIG. 5, base unit terminal P requests a response from a nearby handset terminal (C1), receives a response from the handset terminal (step S7), and establishes a communication route to all handset terminals. Is done.

  If there is no slave terminal in the neighborhood, a response is requested to another neighbor slave terminal to collect routing information. In the example of FIG. 5, if a child device terminal C4 is newly added near the parent device terminal P and communication between the parent device terminal P and the child device terminal C4 is possible, the child device terminal C4 is relayed. New routing information from the master terminal P to the slave terminal C3 is added to the own terminal.

  In addition, the number of hops of the communication route from the child device terminal C3 to the parent device terminal P through the child device terminal C4 is “2”, and the parent device terminal P passes through the child device terminals C3-C2-C1. Therefore, the communication route from the child device terminal C3 to the child device terminal C4 to the parent device terminal P is determined.

  It is important that two or more communication routes from the parent device terminal P to the child device terminal C3 or conversely from the child device terminal C3 to the parent device terminal P are secured. When the communication route of the first candidate is blocked, it is possible to communicate with the target terminal through the second and third communication routes. The maximum condition for determining the communication route is to give priority to the communication route that minimizes the number of hops between the parent terminal and the child terminal.

(1-2) Other Terminal Communication Monitoring Function FIG. 8 shows a monitoring flow of other terminal communication. Before describing the flow of FIG. 8, items necessary for understanding the flow of monitoring processing of other terminal communication will be briefly described. The “source” in FIG. 8 refers to the terminal (slave terminal) that first transmitted the communication data (in this case, street lamp failure information data), and the “destination” refers to the final data to be transmitted. It means a destination terminal (master terminal).

  Also, “relay source” means the (first) relay terminal of the notification data of the transmission source, and “relay destination” is the next (previous) relay for passing data to the final terminal (master terminal P). Means a terminal. In the example of FIG. 5, when the slave terminal C3 is a sender, the slave terminal C2 is a “relay source”, the slave terminal C1 is a “relay destination”, and the master terminal P is a “send destination”.

  As a result, when the transmission source terminal transmits communication data to the transmission destination terminal (master terminal P), the transmission source terminal adds “transmission source terminal”, “transmission destination terminal”, “relay destination”, and “relay source” to the communication data. Is attached as communication header information and transmitted to the slave terminal to be relayed. When calling from "source", "relay source" and "source" match, but when relaying to the terminal and repeating the relay multiple times, "relay destination" and "relay source" each time "Is updated.

  Finally, when the relay terminal immediately before the “source” is transmitted to the “destination”, the “relay destination” and the “destination” match. In the example of FIG. 5, when the slave terminal C3 relays the slave terminals C2 and C1 in order to communicate with the master terminal P, the slave terminal C3 makes a relay request to the slave terminal C2. The header information is “C3”, “P”, “C2”, and “C3”.

  Next, the header information when the slave terminal C2 receives a relay request from the slave terminal C3 and makes a relay request to the slave terminal C1 which is the next relay destination is “C3” “P” “C1” “C2”. It becomes. Further, the header information when the slave terminal C1 receives the relay request from the slave terminal C2 and transmits the communication data to the master terminal P which is the final transmission destination is “C3” “P” “P” “C1”. It becomes.

  The monitoring process of other terminal communication starts from the activation of the terminal (step S11), intercepts the communication of the other terminal and waits for reception of the communication data (step S12). It is determined from the strength of the intercepted communication signal whether the caller is a neighbor (step S13). When it is determined that it is in the vicinity, it is further determined whether or not the relay destination or the final transmission destination is a neighbor (step S14). When the relay destination or the final transmission destination is in the vicinity, whether or not to request relay to its own terminal (Step S15), and when it is determined that the relay to the own terminal is requested, an optimum communication route is selected from the routing information of the own terminal and the relay function of the own terminal is activated (Step S16). The data is transmitted, and the communication data reception waiting state is returned (step S17).

  On the other hand, when it is determined in step S13 that the source terminal is not a neighbor, the number of hops from the source terminal to the relay destination is compared with the routing information stored in the own terminal to determine which is the smaller number of hops. If it is determined that the number of hops from the source terminal to the relay destination is large (YES in step S18), the process proceeds to step S14. If the number of hops from the source terminal to the relay destination is determined to be small, The communication data of the neighboring transmission source received by the terminal is fetched, the relay source terminal of the received data is set as the relay destination to the transmission source terminal, the communication destination is switched to the transmission source terminal, and the routing information is updated (step S19). Step S14 is determined based on the updated routing information.

  In step S14, when it is determined that the relay destination or the final transmission destination is not a neighborhood, the number of hops from the relay destination to the relay source is compared with the routing information stored in the own terminal to determine the number of hops. When it is determined that the number of hops is small, the relay source terminal of the received data is set as the relay destination to the relay destination terminal, and the routing information to the relay destination terminal is updated (step S21), and then in step S15 When the determination is made and the relay to the own terminal is not requested, the process returns to the communication data reception waiting state as it is (step S17).

(1-3) Relay Function The relay function selects communication data by selecting an optimum communication route (communication route with the smallest number of hops) from the routing information accumulated in the terminal by the communication route search function of the terminal. It is a function to transmit. In FIG. 9, the slave terminal determines whether or not there is routing information to the “destination” (master terminal P) in its own terminal (step S 31). If there is such information, the slave terminal is based on the routing information. Then, transmission to the relay destination (transmission destination) is requested (step 32), and the relay function is terminated. In step S31, if there is no routing information to the “destination” (master terminal P), the relay source is notified that relaying is not possible (step S33), and the relay function is terminated. Communication data of transmission information transmitted from a specific slave terminal is transmitted to the master terminal through a determined communication route based on routing information held by each slave terminal.

(2) Generation and transmission of communication data of transmission information In the street light failure monitoring system, the communication data of transmission information is a street light failure detection signal. Generation and transmission of communication data are realized by failure detection processing and failure information notification processing based on the failure notification function of the terminal. The failure detection process is a process for detecting when the street lamp is out of light bulbs, and the failure notification process is a process for identifying the street light where the light bulb has run out and notifying the parent terminal of this.

(2-1) Failure detection process The failure detection process is a process that each terminal individually executes based on a failure detection function of the slave terminal. In FIG. 10, first, a detection processing loop is started (step S41). Next, it is checked whether or not the commercial power supplied to the street lamp is normal (step S42). If it is normal, it is checked whether the street light is being energized from the power source (step S43). If it is energized, it is checked whether the lighting brightness is unstable (step S44). If it is unstable, the base station terminal P is notified of the failure of the street lamp (step S45) and returns to the start of the detection processing loop (step S46).

  If the commercial power supply is abnormal in step S42, a power failure is notified to base unit terminal P (step S47). In step S43, both when the street light is not energized and when the brightness of the street light is stable in step S44, the process directly returns to the start of the detection processing loop (step S46).

(2-2) Failure Notification Processing The failure notification processing is processing for transmitting failure information detected by the failure detection processing to the outside using a communication function. In FIG. 11, a failure notification processing loop is started (step S51), and each terminal detects the presence or absence of a street light failure through the failure detection processing (step S52). It is checked whether or not P exists (step S53), and when there is a parent terminal in the vicinity, the parent terminal is directly notified of the failure of the street light detected by the terminal to the parent terminal P ( Step S54) and return to the start of the failure notification processing loop (step S56).

  In step S53, when the parent terminal P does not exist in the vicinity, the neighboring terminal is requested to relay a failure notification based on the routing information of the own terminal (step 55). On the other hand, when no failure is found in step S52, the loop is terminated as it is (step S56). In FIG. 3, the communication route between the child device terminals Cm, Cn, Cl and the parent device terminal P is determined in advance by the communication route search process, and each of the child device terminals Cm, Cn, Cl has a street light failure. When detected, the detected information is relayed to the parent device terminal P sequentially through the child device terminals in accordance with a further established communication route from the child device terminal Cm to the neighboring child device terminal Cm-1.

  The same applies to the slave terminals Cn and Cl. The communication route connecting the child device terminal Cl and the parent device terminal P includes communication via the child device terminals Cl-2 and Cl-3 from the child device terminal Cl-1 to the child device terminal Cl-4. There are two routes: a route, a communication route via Cl′-2, Cl′-3, and Cl′-4. When determining the communication route, a route with a small number of hops to the parent terminal P is used. The selection is as described above.

  As shown in FIG. 12, the street light failure monitoring system is composed of one monitoring server 8 and one or more sets of failure detection terminals S1 and S2, and each set notified to the parent terminal P The failure information of the street lights S1 and S2 is notified from the modem 7 to the management server 8 in the monitoring server installation area, and the detected information is taken out by the printout or other methods in the server 8, and the information is notified to the maintenance staff. Then go to repair the broken street light. Of course, by connecting the information input to the monitoring server 8 to a higher-level server or mail server, the mobile phone terminal 9 held by maintenance personnel can be notified of failure information and repair instructions. By applying the wireless routing system according to the present invention to a streetlight failure monitoring system, it becomes possible to realize the automation of streetlight failure monitoring regardless of manual monitoring and notification, and to promptly recover a failed streetlight, It can greatly contribute to the city administration of safe and secure city planning by preventing accidents and crimes in the dark when the lights are off, and by reducing the work and expenses for street light maintenance and management.

  In the conventional mesh network system, security is considered to be a problem between nodes that relay traffic, whereas in the wireless notification system according to the present invention, the communication contents of neighboring nodes are intercepted and relayed to a specific terminal. Therefore, the present invention is not limited to the notification of street light failure detection information by street light failure monitoring, and can be widely used for transmission of various information where security does not become a problem between nodes.

It is a figure which shows the concept of routing. It is a figure which shows the point which establishes a route between each terminal. It is a figure which shows the example of installation of the street light installed along the sidewalk. It is a block diagram of the terminal used for the system of this invention. It is a figure which shows the route | root of the spontaneous route search between each terminal. It is a flowchart of a spontaneous route search of a slave terminal. It is a flowchart of the spontaneous route search of a main | base station terminal. It is a flowchart of monitoring of other terminal communication. It is a flowchart explaining a relay function. It is a flowchart explaining a failure detection function. It is a flowchart explaining a failure notification function. It is a figure which shows the structure of the street light failure monitoring system of this invention. It is a figure which shows the concept of the conventional mesh network. It is a figure which shows the problem of the conventional mesh network.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Road 2 Monitoring function 3 Communication function 4 Failure notification function 5 Route search function 6 Relay function 7 Modem 8 Monitoring server 9 Cellular phone N1-N5 Terminal P Master terminal C1-C5 Slave terminal Cn, Cm, Cl Slave terminal S1 , S2 Failure detection terminal set

Claims (10)

A wireless routing system that determines a communication route between a plurality of terminals and a destination terminal by neighboring terminal determination processing and relay transmission confirmation processing,
In the neighboring terminal determination process, each terminal that does not have routing information in the initial state wirelessly communicates with each other, calls a neighboring terminal, determines a terminal that has returned a response to the call, and determines the information of the terminal that has responded Processing to capture in the routing information and intercept the wireless communication information between other terminals, and to capture the information into the routing information of its own terminal,
Routing information is information on a communication route from each terminal to a destination terminal that is a final transmission destination directly or via a relay point,
The relay transmission confirmation process specifies a destination for a neighboring terminal determined by the neighboring terminal confirmation process, requests a relay call to another terminal, specifies the relay terminal that responds to the call, and specifies the destination terminal. A wireless routing system for determining a communication route to a terminal and transmitting information from a terminal to a destination terminal via the determined communication route.   The wireless routing system according to claim 1, wherein when two or more communication routes between a certain terminal and the destination terminal are determined, a route with a small number of hops is determined preferentially as a communication route.   In the neighbor terminal determination process, a terminal that has received a radio signal by a call from a certain terminal transmits a radio signal of a certain strength in response to the call, and there is a terminal that has responded to the neighbor by this response. Recognizing this, the other terminal that has received the response knows the existence of the terminal that called the terminal of the responding terminal, and establishes a communication route that relays the responding terminal to reach the first calling terminal. 2. A process according to claim 1, wherein each terminal determines another nearby terminal capable of communicating directly or by relay, and holds this as routing information of the terminal itself. The wireless routing system described in 1.   The relay transmission confirmation process checks whether the routing information of the requested destination terminal is included in the routing information held by the terminal requested to relay, and if it does not exist, relays to other neighboring terminals. If there is no other terminal other than the terminal that requested the relay, the relay failure is returned to the requested terminal, and if the routing information of the destination terminal is in the routing information held by the own terminal, Select a terminal and request relay to a relay terminal that can communicate with the requested terminal, or if the destination terminal is nearby, directly send the request content wirelessly, and the terminal that received the call will relay the terminal On the other hand, the wireless routing system according to claim 1, further comprising a process of requesting a response to the request source and determining a relay terminal to each terminal. A wireless routing system that transmits information to a parent device terminal directly from a child device terminal or relays another child device terminal or transmits information to all child device terminals from the parent device terminal,
Each terminal has a route search function for executing neighboring terminal determination processing and relay transmission confirmation processing,
The route search function is a spontaneous route search function and other terminal communication monitoring function,
The spontaneous route search function voluntarily requests information from neighboring terminals when there is no routing information in the own terminal, adds information on neighboring terminals that have responded to the routing information of the own terminal, and when there is routing information. This is a function that requests a response from the parent device to a nearby terminal, waits for the response, and determines the communication route to the parent device, and the other terminal communication monitoring function monitors communication between other terminals. The wireless routing system according to claim 1, wherein the wireless routing system is a function of determining routing information of another terminal by (intercepting), updating the routing information of the own terminal, and continuing to accumulate. The spontaneous route search function of the slave terminal is a function to search for a communication route from the self terminal to the master terminal. When there is no routing information in the self terminal, The step of issuing a transmission signal of a certain strength as a call to the neighbor without specifying the request and requesting a response to the neighboring terminal, and when there is a response from the neighboring terminal to the call, the neighboring routing information To determine the communication route leading to the parent terminal, and when the own terminal has routing information, request a response from the parent terminal to the neighboring terminal, and A step of waiting for a response and determining a communication route to the parent terminal,
The autonomous route search function of the parent device terminal is a function that obtains routing information from the parent device terminal to all the child device terminals in the child device terminal, and determines the communication route to the parent device terminal by adding neighboring routing information And determining whether the route from the parent device terminal to all the child device terminals has been confirmed instead of the step of requesting a response from the parent device terminal to the neighboring terminal, and 6. The wireless routing according to claim 5, further comprising a step of requesting a response from the slave unit terminal and a step of determining a communication route to all the slave unit terminals upon receiving a response from the slave unit terminal. system.   The monitoring process of other terminal communication is determined to be a neighbor, a step of intercepting the communication of the other terminal and receiving the communication data, a step of judging whether or not the transmission source is a neighborhood based on the strength of the intercepted communication signal When determining whether the relay destination or final transmission destination is a neighbor, and when the relay destination or final transmission destination is a neighbor, determine whether to request relay to the own terminal. When requesting relaying, it is determined that the optimal communication route is selected from the routing information of the terminal itself, the communication function is transmitted using the relay function of the terminal itself, and the source terminal is not in the vicinity. The number of hops from the source terminal to the relay destination is compared with the routing information stored in the own terminal to determine which is the smaller number of hops, When it is determined that the number of hops from the end to the relay destination is large, it is determined that the number of hops from the source terminal to the relay destination is conversely the step of determining whether the relay destination or the final transmission destination is a neighborhood Sometimes, the local terminal receives the communication data of the neighboring source received by the terminal, sets the relay source terminal of the received data as the relay destination to the source terminal, switches the communication destination to the source terminal, and updates the routing information Determining whether the relay destination or the final transmission destination is a neighborhood based on the updated routing information, and when determining that the relay destination or the final transmission destination is not a neighborhood, from the relay destination to the relay source Compare the number of hops with the routing information stored in its own terminal to determine the number of hops. When it is determined that the number of hops is small, the relay destination to the relay destination terminal After setting the relay source terminal of the received data, updating the routing information to the relay destination terminal, and when requesting relay to the local terminal, the step of transmitting the communication data by the relay function of the local terminal has 6. The function is a function of selecting communication routes with the smallest number of hops from the routing information stored in the terminal by the communication route search function of the terminal and transmitting communication data. The wireless routing system described in 1. The information is transmitted to the master terminal directly from the slave terminal or via another slave terminal, and installed in the city using the wireless routing system according to claim 1, 2, 3, 4, 5, 6 or 7. A street light failure detection system that detects failures including a street light bulb, a fluorescent light extinction, a broken wire, and reports the information to a monitoring server,
Equipped with a base station as a fixed station for a specific street light connected to the monitoring server, and all the remaining street lights are equipped with a handset terminal. A street light failure detection system that detects and transmits failure information from a terminal that has detected a failure to a destination terminal via a determined communication route. The handset terminal has a failure detection process and a failure information notification process,
The failure detection process is a process that detects when the street light is out of light.
9. The street light failure detection system according to claim 8, wherein the failure notification processing is processing for identifying a street light in which a light bulb has run out and notifying the parent device terminal of this. The master terminal and the slave terminal have a monitoring function, a communication function, and a failure notification function.
The monitoring function is a failure detection function that detects a street light failure,
The communication function is a route search function and a relay function,
The route search function is a function that searches for a communication route to the parent terminal that is the final destination by transmitting and receiving radio signals.
The relay function is a function for requesting the relay of transmission of communication data to the parent device terminal to the neighboring child device terminal determined based on the routing information accumulated in the own terminal,
9. The street light failure detection system according to claim 8, wherein the failure notification function is a function of transmitting failure information detected by the monitoring function to the communication function and further wirelessly transmitting from the communication function.