KR102107392B1 - Streetlight wireless remote monitoring and controlling system - Google Patents

Abstract

According to a feature of the present invention, a mesh network (MN) is formed between each other by using a radio frequency in the 900 MHz band and is installed to match each street light 10 or a group of street lights made of a plurality of street lights 10 to match the mesh network. A plurality of local control devices 110 lighting and controlling the matched street lights 10 according to the control signals received through the (MN); A control server 120 for outputting a control signal for integrally driving and controlling each street light 10 according to an input signal or a programmed item; And a gateway 130 connected to each local control device 110 through the mesh network (MN) and outputting a control signal received from the control server 120 to the designated local control device 110. When each packet of the received control signal satisfies the specified condition, each local control device 110 operates as a RS (Relay Station) and transmits it to the designated local control device 110, and when the RS operates, receives the packet Thereafter, when a backoff time elapses with a specified set time as a maximum, a streetlight wireless remote control system is provided, characterized in that a packet is transmitted.

Description

STREETLIGHT WIRELESS REMOTE MONITORING AND CONTROLLING SYSTEM

The present invention relates to a wireless remote control system for street lights, and more specifically, it is possible to integrally control and control a number of street lights installed on a road, and to manage thousands of street lights at the same time with a single gateway, thereby establishing system maintenance and maintenance costs. The present invention relates to a wireless remote control system for street lamps that can significantly reduce energy consumption.

In general, street lamps are installed in a row, spaced at intervals of 30 to 50 m on both sides of the road, and switchboards are provided to supply electric power to every 20 street lamps. A street light remote control system is used to integrally control and control such street lights. have. The conventional streetlight remote control system is classified into a wired method using power line communication (PLC) and a wireless method using ZigBee, and a data communication modem using CDMA is used for communication between the controller and the control server.

Here, the standard mesh function of Zigbee using the 2.4GHz band is not optimized for streetlight control, and is inefficient. Normally, a gateway equipped with a Zigbee master module is installed in a switchboard unit so that one gateway can control dozens of streetlights. It was individually controlled by Zigbee. In addition, the communication with the server uses a wireless modem, but there is a problem in that the system construction cost increases because the wireless modem is installed in a switchboard unit.

In addition, the wired method of power line communication similarly increases the system construction cost because the gateway equipped with the PLC master module in the switchboard unit communicates with the control server using a wireless data modem.

Patent Publication No. 10-2013-0142612 (2013.12.30), a street light control system using a wireless mesh network. Registered Patent Publication No. 10-1715740 (2017.03.07), wired / wireless composite LED street light control device.

The present invention was created to solve the above-mentioned problems, and the object of the present invention is to simultaneously install each local control device installed in a street light as a single gateway without the need for a gateway for each switchboard by using a radio frequency in the 900 MHz band. The object of the present invention is to provide a street light wireless remote control system that can be managed and greatly reduce system construction costs.

According to a feature of the present invention, a mesh network (MN) is formed between each other by using a radio frequency in the 900 MHz band and is installed to be matched for each street light 10, corresponding to a control signal received through the mesh network (MN) A plurality of local control devices 110 for lighting-controlling the street lights 10; A control server 120 for outputting a control signal for integrally driving and controlling each street light 10 according to an input signal or a programmed item; And a gateway 130 connected to each local control device 110 through the mesh network (MN) and outputting a control signal received from the control server 120 to the designated local control device 110. When each packet of the received control signal satisfies the specified condition, each local control device 110 operates as a RS (Relay Station) and transmits it to the designated local control device 110, and when the RS operates, receives the packet Thereafter, when a backoff time elapses with a specified set time as a maximum, a streetlight wireless remote control system is provided, characterized in that a packet is transmitted.

According to another feature of the present invention, each local control device 110 is respectively assigned a network address (NID) whose value increases or decreases by 1 in a direction away from the gateway 130, and is on a mesh network (MN). Groups a plurality of local control devices 110 into a branch group (BG) based on a state connected to a branch, and is given branch group information (BID) for each branch group (BG), but at a range or three-way on the road. Therefore, when each street light 10 is branched, the branch group information (BID) is changed and is set to increase or decrease by 1 with a new network address (NID) value, and the sequence number (SEQ) of the received packet and the previously received packet (SEQ ) And command (CMD) to compare the network address (NID) value of the local control device 110 based on the set downlink parameter (MESH_DOWNLINK_OFFSET), which is not the same packet. When the calculated result value meets the downlink RS decision setting value, qualification to perform the downlink role is granted, the source address (SA) value, the final destination address (FA) value and the corresponding local control device included in the received packet. If the network address (NID) value of (110) is a condition of 'SA <NID <FA' and the local control device 110 that transmits the received packet belongs to the same branch group (BG), the packet is transmitted to the designated destination. Provided is a wireless remote control system for street lights, characterized in that.

According to another feature of the invention, each local control device 110, the result value of the modular operation of the network address (NID) value of the corresponding local control device 110 based on the set uplink parameter (MESH_UPLINK_OFFSET) is increased If the RS decision setting value is met, the qualification to perform the uplink RS role is granted, and the source address (SA) value included in the received packet is greater than the network address (NID) value of the local control device 110 and received. If the local control device 110 that transmitted the packet belongs to the same branch group (BG), a street light wireless remote control system is provided, characterized in that the packet is transmitted to a designated destination.

According to another feature of the present invention, each street light 10 is arranged in a row on both sides with a road therebetween, and each local control device 110 matching each street light 10 arranged on one side of the road is An odd network address (NID) value is assigned, and each local control device 110 matching each street light 10 disposed on the other side of the road is given an even network address (NID) value, and the gateway 130 ) Transmits a packet that is downlinked through the local control device 110 disposed on one side of the road, and each local control device 110 upwards through the local control device 110 disposed on the other side of the road. Provided is a wireless remote control system for street lights, characterized in that it delivers a packet that is delivered (UPLINK).

According to the present invention as described above,

First, a plurality of local control devices 110 installed to be matched for each street light 10 or for each branch group (BG) composed of a plurality of street lights 10 uses a radio frequency in the 900 MHz band to provide a mesh network (MN) to each other. ) And lights and controls the matched street light 10 according to the control signal received through the mesh network (MN), and the control server 120 integrates each street light 10 according to the input signal or the programmed items. A control signal for driving to the output, and the gateway 130, which is connected to each local control device 110 through the mesh network (MN), controls the control signal received from the control server 120 to the designated local control device ( 110), compared to the conventional Zigbee wireless method in which a gateway is installed in each switchboard, each gateway is installed in the streetlight 10 with one gateway 130. The control devices 110 can be managed at the same time, greatly reducing system construction costs, and by using the radio frequency in the 900MHz band, the data transmission rate is low compared to the Zigbee communication method using 2.4GHz, but the diffraction characteristics of the radio signal The shaded area can be reduced even though it is excellent and the distance is increased.

Second, each local control device 110 is respectively assigned a network address (NID) whose value increases or decreases by 1 in a direction away from the gateway 130, and is connected to a branch on a mesh network (MN). Grouping a plurality of local control devices 110 into a branch group (BG) based on a state, and receiving branch group information (BID) for each branch group (BG), but each street light 10 due to a crossroad or a three-way distance on the road When the branch is changed, the branch group information (BID) is changed and is set to increase or decrease by 1 with a new network address (NID) value, and the sequence number (SEQ) and command (CMD) of the received packet and the previously received packet are set. The result of the modular operation of the network address (NID) value of the local control device 110 is lowered based on the set downlink parameter (MESH_DOWNLINK_OFFSET), which is not the same packet by comparing. If the RS determination setting value is met, the qualification to perform the downlink RS role is granted, and the source address (SA) value, the final destination address (FA) value included in the received packet, and the network address of the corresponding local control device 110 ( NID) value is the condition of 'SA <NID <FA', and when the local control device 110 that transmits the received packet belongs to the same branch group (BG), the RS, which is the downlink forwarder, transmits the packet to the designated destination. It is possible to transmit / receive data by specifying, and it is possible to transmit and receive data by specifying RS, which is an upstream forwarder, in a similar manner, thereby enabling stable wireless communication without collision between transmitted and received data.

Third, each street light 10 is arranged in a row on both sides with a road therebetween, and each local control device 110 matching each street light 10 disposed on one side of the road has an odd network address (NID). Values are assigned, and each local control device 110 matching each street light 10 disposed on the other side of the road is given an even network address (NID) value, and the gateway 130 is placed on one side of the road Downlink (DOWNLINK) packets are transmitted through the local control device 110, and each local control device 110 transmits uplink (UPLINK) packets through the local control device 110 disposed on the other side of the road. By transmitting, collision between transmitted and received data can be prevented and data transmission speed can be greatly reduced.

1 is a schematic diagram showing the configuration of a street light wireless remote control system according to a preferred embodiment of the present invention,
Figure 2 is a block diagram showing the functional configuration of a local control device according to a preferred embodiment of the present invention,
3 is a packet flow diagram in a typical mesh network,
4 is a packet flow diagram in a mesh network of a street light wireless remote control system according to a preferred embodiment of the present invention,
5 is a schematic diagram showing an example of system parameter configuration of a mesh network according to a preferred embodiment of the present invention;
6 is a schematic diagram showing a configuration example of a streetlight address setting method of a streetlight wireless remote control system according to a preferred embodiment of the present invention,
7 is a schematic diagram showing a configuration example of a two-way radio packet of a street light wireless remote control system according to a preferred embodiment of the present invention,
8 is a flowchart showing a downlink RS selection method according to a preferred embodiment of the present invention,
9 is a flowchart showing a method for selecting an uplink forwarder RS according to a preferred embodiment of the present invention,
10 is a time division unidirectional wireless packet flow diagram according to a preferred embodiment of the present invention,
11 is a time division bidirectional radio packet flow diagram according to a preferred embodiment of the present invention,
12 is a schematic diagram showing a wireless packet time allocation method of FIG. 11,
13 is a time division bidirectional radio packet flow diagram according to a preferred embodiment of the present invention,
14 is a schematic diagram showing a wireless packet time allocation method of FIG. 13,
15 is a time division bidirectional radio packet flow diagram according to a preferred embodiment of the present invention,
16 is a schematic diagram showing a wireless packet time allocation method of FIG. 15,
17 and 18 are schematic diagrams showing BID and NID setting examples when a street lamp branches according to a preferred embodiment of the present invention,
19 and 20 are flowcharts of a time division wireless packet forwarder RS according to a preferred embodiment of the present invention.

The objects, features and advantages of the present invention described above will become more apparent through the following detailed description. Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

In the streetlight wireless remote control system according to a preferred embodiment of the present invention, it is possible to simultaneously manage each local control device installed in the streetlight with a single gateway using a radio frequency of 900 MHz band without the need for a gateway for each switchboard. As a system that can significantly reduce the system construction cost, as shown in Figure 1 includes a plurality of local control device 110, the control server 120 and the gateway 130.

First, the plurality of local control devices 110 are nodes that directly control the lighting state of the street light 10 and simultaneously form a mesh network (MN) in the system. It forms (MN) and is installed to be matched for each street light 10 to control lighting of the matched street light 10 according to a control signal received through the mesh network MN.

Here, as shown in Figure 2, the local control unit 110 is provided with a local communication unit 111 to form a mesh network (MN) using a radio frequency of 900MHz band, the lighting control unit 112 It is provided to turn on and off the street lamp 10 at a specified timing according to the control signal received through the local communication unit 111 or to adjust the brightness. By forming a mesh network (MN) using radio frequencies in the 900 MHz band, the data transmission rate is low compared to the Zigbee communication method using 2.4 GHz, but the diffraction property of the radio signal is excellent and the communication distance increases, but the shaded area Can be reduced.

In addition, 900MHz band communication has a lower data transmission rate than 2.4GHz band communication, but has excellent diffraction characteristics and is an unlicensed frequency that is already widely used for wireless phones and RFID. In particular, the government has designated and allowed channels for IoT. Since the output is also increased to 25 mV, it is preferable to use it as an optimal communication means for realizing the general Internet of Things, which does not require a very fast data transmission speed.

The control server 120 is a server that provides a control signal for lighting control of each street light 10, and a control signal for integrally driving and controlling each street light 10 according to a user's input signal or a programmed item. Output.

The gateway 130 outputs a control signal output from the control server 120 to a mesh network (MN) and transmits it to a designated local control device 110 and collects and controls data output from each local control device 110. As a communication device provided to the server 120, the control signal received from the control server 120 is connected to each local control device 110 through the mesh network (MN) to the designated local control device 110. Output.

The control server 120 and the gateway 130 may be connected to a signal using various communication methods, such as a data communication modem or a wide area network (WAN), a local area network (LAN), and a serial communication protocol. For this, the gateway 130 is provided with a communication means for signal connection with each local control device 110 using a radio frequency of 900MHz band, and a communication means for signal connection with the control server 120. .

Meanwhile, FIG. 3 shows a packet flow diagram within a general mesh network. In the drawing, the gateway 130 is a local control device 110 that performs a packet transfer function to a base station (BS), and is indicated as RS (Relay Station). Referring to FIG. 3, the advantage of the mesh network is that the number of gateways can be minimized because data is transferred as the number of hops increases at a time from the gateway, that is, in the case of a street lamp that is not within 1 Hop. For example, in the case of a structure in which a ZigBee master module is installed in each switchboard and a ZigBee module is installed in each street light disposed on both sides of the switchboard, the number of street lights that can be individually controlled by one master ZigBee is greatly increased by using a mesh network. I can do it.

Accordingly, in the wireless remote control system for street lights according to a preferred embodiment of the present invention, the installation cost is minimized by directing a structure in which the gateway 130 is not installed for each switchboard. To do this, as the number of hops increases as the general mesh network is used, that is, the distance of the street light from the gateway increases, the data transfer or data collection time increases exponentially as shown in FIG. 3. This is a disadvantage of the general mesh network (MN), because it is necessary to enter the backoff to increase the hop and minimize the possibility of collision before transmission. As the maximum backoff time increases with the hop This is because the exponential increase of 2. To avoid this, the streetlight is not a structure in which a large number of dogs are arranged in one area, but is generally a structure that extends in a narrow direction in series, eliminating the exponential term of 2 when calculating the backoff to reduce the maximum backoff time. We want to devise a way to make it constant. Also, since all the wireless modules in the same hop are intended to be delivered, the transmission function is given only to RSs under a specific condition to minimize collisions and effectively construct a mesh network (MN).

To this end, each local control device 110 operates as a RS (Relay Station) when a packet of the received control signal meets a specified condition and delivers it to the designated local control device 110. It is desirable to be provided to transmit a packet when a backoff time elapses from a specified set time to a maximum range after reception.

When the plurality of local control devices 110 process data at the same time, the backoff is performed when a transmission waiting time set to transmit data at different times has elapsed after receiving a packet so as not to collide with each other. It means that data is transmitted, and the backoff time is a set transmission waiting time, and each transmission waiting time is determined by a random number within the longest waiting time range set by a preset program, and the maximum backoff time is (Backoff max Time) is a preset longest backoff time.

In more detail, in the communication of 900 MHz, FSK (Frequency Shft Keying) is generally used. In the case of the FSK method, since one frame transmission time is 20 ms, the transmission time is 20 ms. After receiving the packet, the RS with the transmission qualification creates a transmission packet, waits for a backoff time with a maximum range of time before transmission, and transmits it. As described above, because certain conditions are given to RS and only some of the RSs in the same hop are transmitted, if this condition and the maximum backoff max time can be adjusted as system parameters, overall performance can be adjusted after system installation. There will be.

5 shows an example of a parameter configuration embodying this. Referring to FIG. 5, the control server 120 shows a method of remotely downloading the main parameters in the group unit, that is, in the branch group (BG) unit, through the gateway 130. In other words, if the max value of the backoff time in FIG. 4 is to be changed to 200 ms, '＄ Trdpc79: 65535: 123 * MBM * 200' may be sent down to the gateway 130 as shown in the last column of the table of FIG. 5. Here, '79' is a command to download the parameters of the system, and '123' represents a group 123. This is one embodiment for downloading system parameters.

Referring to FIG. 6, each local control device 110 is respectively assigned a network address (NID) whose value increases by one in a direction away from the gateway 130 and connected to a branch on a mesh network (MN). Grouping a plurality of local control devices 110 into a branch group (BG) based on a state, and receiving branch group information (BID) for each branch group (BG), but each street light 10 due to a crossroad or a three-way distance on the road When the branch, the branch group information (BID) is changed, and may be set to increase by 1 with a new network address (NID) value. Here, the network address (NID) may be assigned a value in which the value decreases by 1 in a direction away from the gateway 130. In this way, if the network address (NID) and branch group information (BID) are assigned to the RS, all street lights 10 in the jurisdiction can be classified into the network address (NID) and branch group information (BID).

Here, the branch group (BG) is a plurality of local control devices 110 that are set to control so that each local control device 110 is connected or turned off together with reference to a feature connected by a branch connection structure centering on the gateway 130. As a grouping of the groups, each streetlight 10 may be installed on the road or set based on a group that is set to light out in groups on a streetlight operating system.

7 shows an example of a bidirectional wireless packet in a wireless section used in a streetlight wireless remote control system according to a preferred embodiment of the present invention. This is only an example and is not limited thereto. Referring to FIG. 7, a wireless packet includes a source address (SA) and a destination address (DA) as a destination address of a device that normally sends a packet, and a final destination address (FA) and a start address IA (Initial). Address). In the case of Downlink packets, FA is the address of the local control device 110 installed in the specific street light 10, IA is the address of the gateway 130, and in the case of uplink packets, the IA is the local control device installed in the specific street light 10. It becomes the address of 110 and the FA becomes the gateway 130. In an embodiment, in order to turn on / off all the street lights 10 at the same time, FA in a downlink packet may be set to 0 × FFFF, that is, 65535. In addition, CMD can be controlled in various ways using it as a control command. For example, only the even numbered street lights can be turned on / off, or the third street lights can be turned on / off or dimmed.

8 is a flowchart for a downlink forwarder selection method in a mesh method according to a preferred embodiment of the present invention. Referring to FIG. 8, each local control device 110 compares the received packet with the sequence number (SEQ) and command (CMD) of the previously received packet to determine whether they are the same (S210), ignoring the same cases, and ignoring them. Based on the downlink parameter (MESH_DOWNLINK_OFFSET) set while being a packet, it is determined whether the result of the modular operation of the network address (NID) value of the corresponding local controller 110 matches the downlink RS set value (S220). After that, if they do not match, they are ignored, and if they do, they are eligible to perform the downlink role.

In addition, the source address (SA) value, the final destination address (FA) value and the network address (NID) value of the corresponding local control device 110 included in the received packet are received while the conditions of 'SA <NID <FA' are received. If the local control device 110 that transmits the packet determines whether it belongs to the same branch group (BG) (S230), and meets the above conditions and simultaneously belongs to the same branch group (BG), the corresponding packet is transmitted to the designated destination.

Incidentally, in the case of the mesh method, the sequence number (SEQ) and the command (CMD) are compared among the information of the packet first received by the traditional technique, and if it is the same packet as the previously received packet, it is discarded. Then, as a basic qualification to perform the role of a forwarder, if the result is 1 when a modular operation is performed with its network address (NID) as the first parameter of MESH_DOWNLINK_OFFSET (assuming 4) in FIG. 5, the forwarder is eligible.

This means that the RS's network address (NID) is qualified as a forwarder in the order of 1,5,9,13 ... Then, the source address (SA) and the final destination address (FA) and the network address (NID) included in the received packet are the conditions of SA <NID <FA, and the RS that sent the received packet has the same branch group information (BID). It judges whether it has, and if yes, it carries out delivery. Even if the above condition is No, if the SA of the received packet is the same as the RSu of the RS, and the branch group information (BID) of the received packet is the same as the group information of the RS, this is the first RS of the new branch branched from this branch. Eligible for delivery and RS must deliver.

9 is a flowchart for an uplink forwarder selection method in a mesh method according to a preferred embodiment of the present invention. Referring to FIG. 9, each local control device 110 is a result of modularly calculating the network address (NID) value of the corresponding local control device 110 based on the set uplink parameter (MESH_UPLINK_OFFSET) (for example, 2) If it is determined (S310) that the uplink RS determination setting value is met, the qualification to perform the uplink RS role is granted.

Also, the source address (SA) value included in the received packet is greater than the network address (NID) value of the corresponding local control device 110, and the local control device 110 that transmits the received packet has the same branch group (BG). ), If it belongs to the same branch group (BG) and transmits the corresponding packet to the designated destination.

Incidentally, if the result of calculating the main parameter of FIG. 5 MESH_UPLINK_OFFSET (4 in this case) as a modular is 2, it is qualified. That is, RS is 2,6,10,14 ..., etc., and is a forwarder of an uplink packet. The next condition is transmitted when the SA of the received packet is greater than the NID and the BID of the street light 10 is the same. This means a condition for delivering packets within the same group.

As another condition, it is determined whether the RS Rsd address and the BIDd address and the S and BIDd addresses of the received packet are the same (S321), and if they are the same, this serves to deliver it to the main branch in the situation of a packet rising from the pruned street light 10. This is the case.

The above is a mesh type street light control method that is modified by specializing a traditional mesh structure to a street light, and the time division method will be described below using another approach.

10 is a structure in which all RSs transmit a packet received from an RS in front of them, not a mesh method. This allows packets to be delivered at high speed without collisions and backoffs. Since most of the packet sizes are predetermined and the reception time is also determined, transmission after a certain period of time after reception is completed will eventually allow all streetlights 10 to sequentially deliver packets at regular intervals.

Referring to FIG. 11, each street light 10 is arranged in a row on both sides with a road therebetween, and each local control device 110 matching each street light 10 disposed on one side of the road has an odd network address. A (NID) value is assigned, and each local control device 110 matching each street light 10 disposed on the other side of the road is given an even network address (NID) value, and the gateway 130 is a road A packet that is downlinked (DOWNLINK) is transmitted through the local control device 110 disposed on one side, and each local control device 110 transmits uplink (UPLINK) through the local control device 110 disposed on the other side of the road. Packet can be delivered.

In other words, FIG. 11 is a method in which the time-division radio packet flow shown in FIG. 10 is improved, so that most street lights 10 are arranged on both sides of the road, so one side has an odd network address (NID) and the other has a network address NID). For example, if an odd number of street lights 10 transmits a downward message and an even number of street lights 10 transmits an upward message, the transmission speed may be doubled.

12 shows an order and time in which a downlink packet descends when Time Slot = 20 ms is assumed in the structure of FIG. 11. That is, if the NID is odd, it is downlink, and if it is even, it is uplink delivery time. When operated in this way, when about 7,000 street lights 10 are arranged on both sides, the time taken for the packet to go down from the gateway 130 to the last street light 10 and then go up to the gateway 130 again is 7,000 × 20ms = 140 seconds.

13 is another embodiment of a time-division two-way wireless packet according to a preferred embodiment of the present invention, using a conventional packet including at least two streetlights, skipping and transmitting one streetlight at a time when delivering packets Structure. That is, as shown in the drawing, street lights 3, 4 and 7, 8 do not play the role of a communicator.

14 shows the order in which bidirectional packets are allocated for each slot in this case. And when the packet is delivered in this way, the time required to scan all 7,000 street lights is (7,000 / 2) × 20 ms = 70 seconds, which can be reduced by half compared to the above case.

15 shows another embodiment of a time division bidirectional radio packet, and FIG. 16 shows time allocation for this. Referring to FIGS. 15 and 16, it is the same as skipping in the downward and upward directions, but it is possible to provide an effect that data of various services can be loaded by waiting for the same time.

17 shows an example of setting BID and NID when a street lamp branches. When a downlink packet is transmitted and encounters a branch point, it is delivered to both sides. At this time, collision may occur when transmitting around the branch point, but there is no Hidden Node Issue because they are close to each other, and collision can be avoided without a backoff according to the LBT (Listen Before Transmission) rule, which is a common wireless communication method. At this time, the RS of the first streetlight 10 at which the branch starts is NID is always 1, and the BID and NID of the RS of the branch that delivered the downlink packet to the BIDu and RSu must be stored in order to recognize their turn. This is a necessary measure for the delivery of downlink packets.

18, on the contrary, is a structure for delivering an uplink packet. When the branches meet, the RS in the closest position of the branch remembers the BID and NID of the first RS of the branch as BIDd and RSu. A collision may occur near the branch point, but according to the conventional wireless communication method LBT, since there is no Hidden Node Issue, it will be transmitted without collision. The method of notifying the BID and NID of the top RS to the RS of the street light 10 at the starting position of the branch can be wirelessly set in a normal way in the field after the installation of the street light.

For reference, it is not necessary to memorize the BID or NID of the RS at the top or bottom of a street lamp that is not the starting point of the branch, since the BIDs are all the same and the NID can be determined by its own NID value as described above. to be.

19 is a flowchart of a downlink wireless packet delivery RS in a time division scheme according to a preferred embodiment of the present invention. According to the above embodiment, the RS of the street light can determine whether it is the role of the downlink packet forwarder, the role of the uplink packet forwarder, or not the forwarder according to its NID value. If the RS is a forwarder of a downlink packet, when a downlink packet is received, SA and FA values in the packet are compared with its own NID value to determine whether or not the received packet should be delivered. In the embodiment of FIG. 19, it is a condition for determining that the SA of a received packet is a packet to be delivered when 4 is smaller than its NID. If the FA and NID are the same, CMD in the packet is performed and the rest are ignored.

20 is a flow chart of a time-division radio packet in an upward direction. When the uplink packet is forwarded, the RS, which is the uplink packet forwarder, determines whether to ignore or forward the received packet according to the SA value in the packet and its NID value when receiving the uplink packet, and the conditions to be delivered in the embodiment illustrated in FIG. 20. Is a condition for determining that the received packet is a packet to be delivered when the SA of the received packet is 4 greater than its NID. Here, 4 is a system parameter that can be changed as defined in FIG. 5.

Meanwhile, as illustrated in FIG. 2, the local control device 110 includes a fault detection unit 113 that detects whether the local control device 110 has failed, and a sensor unit that senses ambient environmental conditions such as ambient temperature or humidity. 114 may be further provided. The measurement values detected by the failure detection unit 113 and the sensor unit 114 are transmitted to the control server 120 through the local communication unit 111 and the gateway 130, so that the street lights are turned on / off, sequentially lit / off, In addition to the control functions such as crossing / off, it is possible to monitor the function of the fault or monitor the environment. In addition, in the case of collectively controlling the street light in the unit of the switchboard, it is usually controlled only in the group unit under the jurisdiction of the switchboard.

The present invention described above is not limited by the above-described embodiments and the accompanying drawings, and various substitutions, modifications and changes are possible within the scope of the present invention without departing from the technical spirit of the present invention. It will be apparent to those who have knowledge.

10 ... Street light 110 ... Local control device
111 ... Local device 112 ... Lighting control
113 ... Fault detection unit 114 ... Sensor unit
120 ... control server 130 ... gateway

Claims (4)

A mesh network (MN) is formed between each other by using a radio frequency in the 900 MHz band, and is installed to be matched for each street light 10 to lightly control the corresponding street light 10 according to a control signal received through the mesh network (MN). A plurality of local control devices 110; A control server 120 for outputting a control signal for integrally driving and controlling each street light 10 according to an input signal or a programmed item; And a gateway 130 which is connected to each local control device 110 through the mesh network (MN) and outputs a control signal received from the control server 120 to the designated local control device 110. ,
Each local control device 110 operates as a RS (Relay Station) when the received control signal packet satisfies a specified condition and delivers it to the designated local control device 110. When the backoff time with the specified set time as the maximum range has elapsed, a packet is transmitted,
Each local control device 110 is respectively given a network address (NID) whose value increases or decreases by 1 in a direction away from the gateway 130, and is connected to a branch on a mesh network (MN). As a standard, a plurality of local control devices 110 are grouped into a branch group (BG) and branch group information (BID) is given for each branch group (BG), but each street light 10 is diverged due to a crossroad or a three-way distance on the road. When the branch group information (BID) is changed, it is set to increase or decrease by 1 with a new network address (NID) value.
Each street light 10 is arranged in a line on both sides with a road therebetween, and each local control device 110 matching each street light 10 disposed on one side of the road has an odd network address (NID) value. Each local control device 110 that matches each street light 10 disposed on the other side of the road is given an even network address (NID) value,
The gateway 130 sequentially delivers packets that are downlinked through the local controller 110 disposed on one side of the road, and each local controller 110 is a local controller disposed on the other side of the road. Packets that are uplinked (UPLINK) through (110) are sequentially delivered,
The RS matching the first streetlight 10 where each streetlight starts to branch has a network address (NID) of 1 at all times, and the branch group information (BID) and network address (NID) of the RS of the branch that delivered the downlink packet. ) Is recognized as BIDu and RUs, and it recognizes its own packet transmission sequence.
The method according to claim 1,
Each local control device 110,
By comparing the sequence number (SEQ) and command (CMD) of the received packet and the previously received packet, the packet is not the same and the network address (NID) of the local control device 110 based on the set downlink parameter (MESH_DOWNLINK_OFFSET) ) If the result of the modular operation meets the downlink RS set value, you are entitled to perform the downlink role,
The source address (SA) value, the final destination address (FA) value and the network address (NID) value of the corresponding local control device 110 included in the received packet are the conditions of 'SA <NID <FA' and the received packet When the transmitted local control device 110 belongs to the same branch group (BG), the streetlight wireless remote control system is characterized in that the packet is transmitted to a designated destination.
The method according to claim 2,
Each local control device 110,
If the result of the modular calculation of the network address (NID) value of the corresponding local control device 110 based on the set uplink parameter (MESH_UPLINK_OFFSET) matches the uplink RS decision setting value, the qualification to perform the uplink RS role is granted,
The source address (SA) value included in the received packet is greater than the network address (NID) value of the corresponding local control device 110, and the local control device 110 that transmitted the received packet is in the same branch group (BG). If it belongs, the streetlight wireless remote control system characterized in that the packet is transmitted to a designated destination.
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