WO2015152557A1

WO2015152557A1 - Streetlight management system

Info

Publication number: WO2015152557A1
Application number: PCT/KR2015/002870
Authority: WO
Inventors: 성석; 김영준
Original assignee: 주식회사 케이엠더블유
Priority date: 2014-03-31
Filing date: 2015-03-24
Publication date: 2015-10-08
Also published as: KR20150113570A

Abstract

Disclosed is a system for managing a plurality of streetlights in which at least one lamp is installed at one lamp pole, the system comprising: streetlight controllers which are installed in the lamp and which have a Zigbee communication module so as to form a Zigbee communication network; and a gateway connected to the streetlight controllers through the Zigbee communication network, and transmitting information of the streetlight controllers to a streetlight control server by using an external communication network, and transferring control information of the streetlight controllers transmitted from the streetlight control server to the streetlight controllers through the Zigbee communication network, wherein: the streetlight controllers installed in the lamps of the plurality of streetlights are divided into a coordinator and a router depending on the set-up; the gateway is connected to a plurality of coordinators; each coordinator is connected to a router group; the router group includes a plurality of routers connected in series with each other; and the gateway and coordinators communicate with each other through wireless channels which are different from each other.

Description

Street light management system

The present invention relates to a streetlight management network for managing a plurality of streetlights, and more particularly to a streetlight management system.

In general, a large number of lighting facilities such as street lights and security lamps (hereinafter referred to as 'street lights') are installed in a relatively large area, and each street lamp is used to manage lighting time, turn off time, and trouble management of each street light. The streetlight management network is connected to the remote control server.

Meanwhile, a street light controller installed in each street light and managing and controlling the street light starts with a photoelectric type that is turned on by the amount of ambient light, and a timer that is simply turned off by a microcomputer, and one-way using VHF (Very High Frequency). Today, two-way controllers have emerged that can monitor the status of street lights in both directions.

Although the bidirectional street light controller is implemented using a power line communication (PLC) method, a street light control method using a Zigbee wireless communication technology has recently been proposed. ZigBee, which is based on the IEEE 802.15.4 standard, uses a mesh network to transmit data through multiple intermediate nodes to its destination, enabling a wide range of communication despite low power. Ad-hoc network characteristics make it suitable for applications where no central node exists. ZigBee operates on industrial, scientific and medical radio frequencies (ISM bands). It uses 868 MHz in Europe, 915 MHz in the US and Australia, and 2.45 GHz radio in most parts of the world. Data transfer rates are around 20 kilobytes per second in the 868 MHz frequency band and 250 kilobytes per second in the 2.4 GHz frequency band. In addition, the number of channels by ZigBee frequency can be used in 1 channel at 800MHz, 10 channels at 900MHz, 16 channels at 2.4GHz.

That is, the Zigbee communication module is mounted on the street lamp controller, and the street lamp controller communicates with a central control server at a remote location through the Zigbee network to perform on / off control of a street lamp or automatic notification of a street lamp failure. The proposed streetlight remote control method using ZigBee wireless communication technology is a remote control method for streetlights and performs broadcast using AODV (Adhoc On-Demand Vector) routing method and tree routing method. Such a street light control technology using the Zigbee wireless communication technology, the domestic patent application No. 10-2009-0126253 (name: "broadcasting method of the street light Zigbee network", Applicant: Samsung Electro-Mechanics, Inc., inventor: Ji-Hoon Kim / Seoboil , Application date: December 17, 2009).

1 is a schematic block diagram of a general street light management network. 1, the street light management network is installed in each street light (10-1, 10-2, ... 10-N) street light controller (11-1, 11-2,. 11-N). Each of the street light controllers 11-1, 11-2, ... 11-N is equipped with a Zigbee module capable of short-range communication so that each street light controller 11-1, 11-2, ... 11-N It forms a Zigbee communication network, and has a structure capable of collecting data of each streetlight controller (11-1, 11-2, ... 11-N) to one gateway (14). The Zigbee communication network used here is an ad hoc in which individual street light controllers 11-1, 11-2, ... 11-N can serve as ZigBee routers to extend the communication distance beyond 1-hop. A characteristic of the network configuration is that the streetlight controllers 11-1, 11-2, ... 11-N located within the Zigbee communication distance can transmit and receive data with each other. In addition to the substantially same configuration as each of the streetlight controllers (11-1, 11-2, ... 11-N), for example, a communication module connected to the airwave communication module, such as CDMA or a wired Internet backbone network is mounted. The gateway 14 receives the state information of each streetlight controller 11-1, 11-2, ... 11-N through Zigbee communication, and uses an external communication network 16 such as CDMA or mobile communication. By transmitting to the street lamp control server 40, the manager terminal 52 is connected to the control server 40 so that the administrator can be provided with the necessary information. Command signals such as lighting control transmitted from the street lamp control server 40 are transmitted to the street lamp controllers 11-1, 11-2, ... 11-N of each street lamp through the gateway 14.

On the other hand, the street lights 10-1, 10-2, ... 10-N are typically installed in a line, for example, several tens of meters apart along a particular road. Accordingly, from the standpoint of the Zigbee communication network, the street light controller (11-1 in the example of FIG. 1) closest to the gateway 14 serves as a coordinator, and the remaining street light controller (in the example of FIG. 1). , 11-2, 11-N) serve as a router for transmitting a signal to a streetlight controller immediately adjacent to the rear end.

As described above, the Zigbee communication network composed of street light controllers 11-1, 11-2, ... 11-N is configured in such a manner that a plurality of routers are sequentially connected to one coordinator, thereby communicating in a short channel. The channel is being formed. This network configuration method causes channel resource saturation, especially when a large number of nodes (routers) are included in a narrow area, and communication failure is more likely to occur.

In addition to Zigbee, technologies that use the 2.4 GHz Industrial, Science and Medial (ISM) Band include Wi-Fi (WiFi) and Bluetooth (Bluetooth), which include Wireless Local Area Network (WLAN) and Wireless Personal Area Network (WPAN). It is used to construct. These technologies are relatively short coverage of the wireless section, and are considered to implement a low power wireless sensor network. For this reason, WPANs and WLANs often coexist in the same area, and moreover, frequency bands that overlap each other overlap, causing communication failures due to interference between them. Therefore, as described above, even in a Zigbee communication network composed of street light controllers 11-1, 11-2, ... 11-N, there is a need to solve the above-described frequency interference problem.

Accordingly, an object of the present invention is to provide a street light management system that can prevent the occurrence of channel resource saturation and reduce the occurrence of communication failure.

Another object of the present invention is to provide a street light management system that can effectively cope with the occurrence of communication failure caused by frequency interference.

Still another object of the present invention is to provide a street lamp management system suitable for being implemented in a street lamp having a plurality of lamps in one column.

In order to achieve the above object, the present invention provides a management system for a plurality of street lamps, at least one lamp is installed in one column; A street light controller installed in the lamp and having a Zigbee communication module to form a Zigbee communication network; The street lamp controller is connected to the Zigbee communication network, and transmits the information of the street lamp controller to a street lamp control server using an external communication network, and transmits the control information of the street lamp controller transmitted from the street lamp control server to the Zigbee communication network. A gateway for transmitting to the street lamp controller through; A street lamp controller installed in the lamps of the plurality of street lamps is divided into a coordinator and a router according to a setting, the gateway is connected to a plurality of coordinators, and each coordinator is connected to a router group; The router group is characterized in that a plurality of routers are connected in series with each other, and the gateway and each coordinator communicate through different wireless channels.

As described above, the street lamp management system according to the present invention is suitable to be implemented in a street lamp having a plurality of lamps in one column, prevent the occurrence of channel resource saturation, and reduce the occurrence of communication failure. In addition, it is possible to effectively cope with the occurrence of communication failure due to frequency interference.

1 is a schematic block diagram of a typical streetlight management network

2 is a schematic block diagram of a streetlight management network according to an embodiment of the present invention;

3 is a detailed block diagram of a streetlight controller of FIG.

4 is a configuration diagram of a connection relationship on the Zigbee communication network of FIG.

5 is an exemplary view schematically showing a channel avoidance operation performed in a streetlight management network according to another embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, specific details such as specific components are shown, which are provided to help a more general understanding of the present invention, and it is understood that these specific details may be changed or changed within the scope of the present invention. It is self-evident to those of ordinary knowledge in Esau.

FIG. 2 is a schematic block diagram of a streetlight management network according to an embodiment of the present invention. In the example of FIG. 2, two first and second streetlights 20-1 and 20-2 are provided for convenience of illustration. While this is shown, it will be appreciated that a number of other street lights may be provided to form a street light management network. The number of channels for each frequency of ZigBee can use 1 channel at 800 MHz, 10 channels at 900 MHz, and 16 channels at 2.4 GHz. The present invention uses a plurality of street lights by using a total of 16 channels at least two or more in Zigbee 2.4 GHz. Can be controlled. In particular, when using 16 channels can control the maximum number of street lights can maximize the effect of the present invention. In addition, the street lamp 20-1. 20-2 shown in Figure 2 is an exemplary view for showing a configuration in which two or more street lamps are installed in one column, in Figure 2, for example, one column A six-lamp street light is shown in which six lamps are installed.

2, the streetlight management network according to an embodiment of the present invention is installed in each of the six-lamp streetlight (20-1, 20-2) by six, streetlight controller 21 for controlling the lamp of the installed streetlight -1, 21-2, 21-3, 21-4, 21-5, 21-6, 22-1, 22-2, 22-3, 22-4, 22-5, 22-6) . Each street light controller 21-1, ... 22-6 is equipped with a Zigbee module capable of short-range communication, and forms a Zigbee communication network between each street light controller 21-1, ... 22-6, It has a structure that can collect the data of each street light controller (21-1, ... 22-N) in one gateway (14).

In the above structure, the six streetlight controllers 21-1, 21-6, which are installed closest to the gateway 14, that is, the first streetlight 20-1 in which the gateway 14 is installed, are provided. Since the signal strength with the gateway 14 is the strongest, the coordinator serves as a coordinator. Each street lamp controller 21-1, ... Act as coordinator on the In the general Zigbee communication method, the coordinator role or the router role is determined through mutual competition in the same channel. However, according to the feature of the present invention, a plurality of street light controllers installed in each street light are assigned different operating channels. It acts as a coordinator or router on the channel. The Zigbee communication standard stipulates to support 16 channels in the 2.45 GHz band. Each of the six streetlight controllers 21-1, ... 21-6 can be allocated with, for example, first to sixth channels. Can be.

Meanwhile, six street light controllers 22-1, ... 22-6 installed in the second street light 20-2 adjacent to the first street light 20-1 without the gateway 14 installed. Is to act as a router according to the signal strength strength with the gateway 14, similarly, each of the street light controller 22-1, ... 22-6) are also allocated, for example, first to sixth channels.

Since the above structure, for example, at the time of initial network connection, the street light controller 21-1 to which the first channel is allocated in the first street light 20-1 serves as a coordinator of the corresponding first channel. The streetlight controller 22-1 to which the first channel is allocated in the second streetlight 20-2 is connected to the streetlight controller 21-1, which is a coordinator of the first channel of the first streetlight 20-1. Plays a role. Similarly, the second to sixth channels of the second streetlight 20-2 to the streetlight controllers 21-2, ... 21-6, which are coordinators of the second to sixth channels of the first streetlight 20-1. The streetlight controllers 22-2, ... 22-6, which are routers, are respectively connected. Similarly, streetlight controllers of a third streetlight (not shown) adjacent to the second streetlight 20-2 are also routers, and streetlight controllers 22 of the first to sixth channels of the second streetlight 20-2. -1, .... 22-6) respectively. Of course, in this configuration, the street light controller acting as a coordinator obtains identification information (address) of the street light controller serving as a router connected to it.

Through this configuration, as a result, the gateway 14 is connected to a plurality of coordinators each using a different radio channel, and each coordinator has a structure connected to each router group. Each router group is formed of a plurality of routers connected in series with each other. In the above operation, the connection operation between the street light controllers, when the initial Zigbee network is formed, the street light controller that acts as a coordinator sends a beacon (beacon) signal, the street light controller that detects the transmitted beacon signal joins the network ( by joining). As described above, after the connection operation between the street lamp controllers is completed, the street lamp controller serving as the coordinator may check the connection state of the street lamp controller serving as a router by periodically sending a polling message. At this time, the street lamp controllers acting as routers may check the polling message to determine whether there is a duplicate, and if not, transfer the street controllers to another street lamp controller connected to the other router, and ignore the duplicated controller. As described above, the street lamp management network according to an embodiment of the present invention can be configured, and since such a network configuration uses a plurality of channels, more smooth communication can be possible in a narrow area. In addition, since a plurality of channels are used, the number of nodes (street controllers) that are centrally controlled can be increased. For example, it operates with 200 nodes per channel, and can be implemented as [16 channels x 200 nodes =] 3200 nodes because up to 16 channels.

On the other hand, the gateway 14 is equipped with an airwave communication module, such as CDMA, for example, similar to the prior art, and receives the state information, etc. of each streetlight controller via Zigbee communication through the streetlight controller acting as a coordinator CDMA Or by using external communication network such as mobile communication. In addition, it receives a command signal for each channel or the lighting control of each individual lamp transmitted from the streetlight control server, and transmits the command signal to the streetlight controller acting as a coordinator, thereby propagating to the entire streetlight controller.

FIG. 3 is a detailed block diagram of the street lamp controller of FIG. 2, and may be equally applied to all of the street lamp controllers shown in FIG. 2. Referring to FIG. 2, in more detail, the street lamp controller may be classified into a Zigbee module that is in charge of a Zigbee communication operation and a control operation and a power module that is in charge of a power supply operation. The Zigbee module includes a Zigbee communication unit 110 and a control unit 101, and the power module includes a state sensing unit 120, a power supply unit 130, and a light switch 140.

In more detail, the street lamp controller includes a Zigbee communication module, and communicates with other street lamp controllers or gateways in the vicinity, and receives a ZigBee communication unit for receiving operation instruction information on the corresponding lamp lamp and transmitting status information of the lamp controller. 110); A state detection unit 120 for detecting an operation state and a peripheral state of a corresponding street light controller including a failure state of a lamp, a power abnormality state, and the like; The state information detected by the state detection unit 120 is transmitted through the Zigbee communication unit 110, and receives the operation instruction information for the corresponding street lamp lamp transmitted from the street light control server, the point of the corresponding street lamp lamp 150, A control unit 101 for controlling the lights out; A turn-on / off switch 140 for switching on or off the street lamp 150 by a point-off control signal of the control unit 101; A circuit including a switching mode power supply (SMPS) and the like is configured to include a power supply unit 130 that receives external commercial AC power and generates operating power for each of the functional units including the control unit 101.

In the above, the state detection unit 120 is a lamp failure detection sensor for detecting a failure state of the lamp using a photocoupler or the like, a power failure detection sensor for detecting a power failure state by detecting the flow of voltage or current of AC power It may include a temperature sensor and humidity sensor for detecting the ambient temperature and humidity, an illumination sensor for detecting the illuminance.

In addition, the street light controller may include a backup battery for supplying backup power in case of power failure.

4 is a configuration diagram of a connection relationship on a Zigbee communication network of FIG. 2. Referring to FIG. 4, a coordinator node [C] is connected to each gateway for each of the first to sixth channels, and each router node [R] for each channel is connected to each coordinator node of the first to sixth channels. Are sequentially connected to form an overall Zigbee communication network. Here, a null Zigbee Modem may be used for the connection between the coordinator nodes. In this network configuration, each coordinator node corresponds to six street light controllers provided in the first street light 20-1 shown in FIG. 2, and router nodes directly connected to each coordinator node are shown in FIG. It will be understood that it corresponds to six streetlight controllers provided in the second streetlight 20-2. It can be seen that this approach has at least three depths of network by the gateway, coordinator and router. On the other hand, in the description of FIG. 4, although the connection relationship of the ZigBee communication network of the first to sixth channel is shown on the network of the six-lamp street light as shown in FIG. 2, in another embodiment of the present invention, for example For example, it may be possible to form, for example, a Zigbee communication network of 7 channels or more on a streetlight network having various structures of 7 or more types.

For example, in another embodiment of the present invention, similar to the scheme shown in FIG. 4, streetlight controllers installed in a plurality of streetlights adjacent to the gateway may be configured to serve as coordinators to which different channels are assigned. For example, a street lamp installed in each direction of the road at the crossroad may be a four-light street lamp having four street lamps, and each street lamp may include four streetlight controllers. In this case, the street light controllers of the street lamps installed on the first direction road are assigned first to fourth channels, and the street light controllers of the street lamps installed on the second direction road are allocated the fifth to eighth channels. Street light controllers of the street lamps installed on the third and fourth directions roads may be allocated to the ninth through twelfth channels and the thirteenth through sixth channels. In addition, the gateway is installed at the central position of the crossroad, so that the streetlight controllers of the respective streetlights closest to the gateway for each of the first to fourth direction roads may be configured to act as coordinators of the first to sixteenth channels as a whole.

FIG. 5 is an exemplary view schematically illustrating a channel avoidance operation in a street lamp management network according to another exemplary embodiment of the present invention. In FIG. 5, a street lamp management network between two lamp street lamps in which two street lamps are installed in one column is provided. The formed state is shown. In addition, Figure 5 (a) shows the initial communication connection state, Figure 5 (b) shows a state where a communication failure occurs due to frequency interference, etc., Figure 5 (c) shows a failure to solve the communication failure problem The state of avoiding a channel is disclosed.

Referring to FIG. 5, for example, a state in which the second lamps 1 to 3 street lights 30-1, 30-2, and 30-3 are sequentially connected is illustrated. As shown in FIG. 1, the first streetlight controllers 31-1, 32-1, and 33-1 provided in each of the streetlights 30-1, 30-2, and 30-3 are assigned a first channel. In the second streetlight controllers 31-2, 32-2, and 33-2, a fourth channel is allocated. In this state, as shown in FIG. 5B due to interference due to the use of the surrounding frequency, communication failure occurs in the first channel between the first street light 30-1 and the second street light 30-2. May occur. In this case, the second streetlight controller 31-2 of the first streetlight 30-1 transmits data by changing a channel to a preliminary reserved channel, for example, a channel that can communicate with the next node. In FIG. 5C, for example, a state in which communication between the second streetlight controllers 31-2, 32-2, and 33-2 is performed through the second channel is illustrated. In addition, according to the IEEE 802.15.4 standard, when a channel is unavailable in Zigbee communication due to interference or the like, a technology in which a spare channel is used may be applied as it is.

That is, in the embodiment of the present invention shown in FIG. 5, when the channel is allocated to each of the streetlight controllers, the reserved channel (s) prepared in addition to the main channel are allocated in advance, and when a communication failure occurs during communication through the main channel, Has a configuration that performs communication through the channel. For example, in addition to the example illustrated in FIG. 5, the first streetlight controller may be assigned a first channel as a main channel and a plurality of spare channels (second channel and third channel). In the second streetlight controller, a fourth channel may be allocated as a main channel and a plurality of spare channels (eg, fifth to seventh channels) may be allocated. In this case, of course, in the streetlight control period of each street light, the available channel check operation and the channel change operation are mutually negotiated through the channel scan operation.

Street light management system according to an embodiment of the present invention can be configured as described above, while in the above description of the present invention has been described with respect to specific embodiments, various modifications can be carried out without departing from the scope of the present invention. . Therefore, the scope of the present invention should not be defined by the described embodiments, but by the claims and equivalents of the claims.

Claims

In the management system of a plurality of street lights, wherein at least one lamp is installed in one column

A street light controller installed in the lamp and having a Zigbee communication module to form a Zigbee communication network;

The street lamp controller is connected to the Zigbee communication network, and transmits the information of the street lamp controller to a street lamp control server using an external communication network, and transmits the control information of the street lamp controller transmitted from the street lamp control server to the Zigbee communication network. A gateway for transmitting to the street lamp controller through;

The street lamp controller installed in the lamps of the plurality of street lamps is divided into a coordinator and a router according to a setting.

The gateway is connected to a plurality of coordinators,

Each coordinator is associated with a router group.

The router group is a plurality of routers are connected in series with each other, the gateway and each coordinator is characterized in that the communication via a different wireless channel.
The method of claim 1,

Wherein each of the wireless channels has a main channel and a spare channel.
The method of claim 1,

And said gateway, coordinator and router have a network of at least three depths.
The method of claim 2,

The router group comprises at least 200 routers.
The method of claim 1,

The Zigbee communication frequency is 2.4GHz and the number of the radio channel is a streetlight management system, characterized in that more than two.
The method of claim 3, wherein

The router determines a duplicate message by checking a polling message, and ignores the duplicated streetlight management system.
The method of claim 1,

Street light management system, characterized in that for setting the street light controller closest to the gateway to the coordinator.