KR20120022160A - Guard-lamp wireless network structure and control method thereof - Google Patents

Abstract

PURPOSE: A guard lamp wireless network structure and a control method thereof are provided to actively cope with surrounding environment changes. CONSTITUTION: A relay node(100) transmits control signal information to a plurality of controller nodes(200). The relay node receives monitoring information of a guard lamp from the controller nodes. The relay node transmits the monitoring information to a central control center. The controller nodes receive the control signal information from the relay node. The controller nodes control the guard lamp.

Description

Guard-lamp wireless network structure and control method

The present invention relates to a wireless light network structure and a control method thereof, and to a wireless network structure and a method for smoothly maintaining and controlling the integrated security light for remotely controlling and monitoring a plurality of security lights.

Recently, many security lights have been installed in residential roads or public places for the purpose of securing visibility and safety. In particular, as the number of security, which is mainly used for securing a safe passage at night, is rapidly increased, it is controlled through a remote control system having excellent monitoring and operation convenience and control efficiency.

The remote control system divides the security light control devices that operate individually for monitoring and control of the security light into one or several groups according to the surrounding environment, and remotely integrates and controls them.

1 is a view showing a remote control system, such as security according to the prior art.

As shown in Figure 1, between the security repeater node 10 and the security light controller node 11 or between the security light controller node 11 is superior in the radio wave characteristics such as communication distance, radio transmission, diffraction, and the like compared to other frequency bands A low frequency band (eg 400 MHz) wireless communication is used, and information is remotely exchanged between the security repeater node 10 and the central control center through a main communication network such as a CDMA communication network.

As such, the overall security light controller nodes 11 are divided into several local wireless networks in consideration of reliability of control, physical environment, control cost, and the like, and these wireless networks are composed of various types of network topologies.

In particular, as shown in FIG. 1, each of the local wireless network groups having different network configurations is as follows.

First, group 1 is a wireless network structure composed of a star topology, and has a merit that the network configuration is simple and easy to implement, whereas from the security repeater node 10 or the security light controller node 11 If the transmission power is not sufficient, due to a problem in the communication distance between the security repeater node 10 and the security light controller node 11, there is a problem that the efficiency of wireless network construction is greatly reduced. Above all, the biggest problem of Group 1 is that when a wireless communication failure occurs between the security repeater node 10 and the security light controller node 11, there is no alternative communication path to replace it.

Subsequently, referring to Group 2, a wireless network structure composed of a tree topology, which is capable of transmitting data to a desired destination node through security light controller nodes 11 located in the middle of a transmission path, There is an advantage to overcome the limitation of communication distance. In such a wireless network structure, the security light controller nodes located between the first source node and the final destination node finally deliver data to the security repeater node 10 or the security light controller node 11 through a routing protocol.

In general, a routing method of a wireless network composed of a tree topology is mainly used as a routing based on address method in which data is transmitted and received based on an address assigned to each controller node. That is, each of the security light controller nodes assigned an address based on a hierarchical structure has the same branch, and a parent child relationship is formed, thereby transmitting data to a desired destination node without a routing table. It has the advantage of reducing memory waste and routing time. However, the Group 2 tree topology wireless network structure maintains the entire wireless network in Group 2 when the security light controller nodes located in the middle of the source node and the destination node fail and malfunction or suddenly an obstacle occurs in the middle of the data transmission path. It has a fatal problem that it is difficult to be.

Finally, group 3 is a wireless network structure using mesh topology, which maintains multiple communication paths among multiple security light controller nodes at all times to secure alternative communication paths in advance. Compared with the communication distance limitation and the difficulty of maintaining the wireless network has the advantage. On the other hand, in the wireless network structure composed of the group 3 mesh topology, data is transmitted and received by a routing protocol. In general, the routing protocol is divided into two types, a proactive method and a reactive method, according to a method of controlling and providing routing information.

First, referring to the proactive method, all nodes have all communication paths capable of data transmission and reception, and thus there is no need for a separate communication path acquisition procedure because routing information is constantly updated and maintained. . However, such a proactive method has a problem in that the wireless network structure is very complicated and the transmission performance of the entire wireless network is deteriorated due to excessive network control overhead according to control signals that occur periodically.

In contrast, the reactive method does not always maintain all communication path information, but performs a communication path acquisition procedure between nodes only when data is transmitted. Such a reactive method has an advantage of preventing performance degradation during data transmission due to excessive overhead, which is a problem of the proactive method described above. However, such a reactive method also has a problem in that real-time monitoring and control is not smooth when the communication path acquisition procedure for data transmission becomes long.

In general, the proactive method and the reactive method through the routing method is applied to an ad-hoc network that does not have an infrastructure such as a base station or an AP and enables high-speed transmission while ensuring mobility. Therefore, when the various types of topology and routing schemes described above are applied to local wireless networks such as current security, problems that seriously degrade the performance of the entire system occur.

In order to solve the problems of the prior art as described above, the present invention is to provide a wireless network structure and the control method of the security light that can be easily implemented using the unique features of the wireless network, such as security and maximize the performance of the wireless network. do.

In addition, the present invention is to provide a wireless network structure and a control method for a security such as actively providing an alternative communication path when the communication path is unsuccessful due to a sudden change in radio wave characteristics due to the occurrence of obstacles, node failure, and the like.

In addition, in order to solve the problems of the prior art as described above, the present invention provides a wireless network structure and the control method of the security network for improving the data communication speed between each node in the wireless network, such as security using a low frequency band. To provide.

The wireless light network structure for controlling a plurality of security lights according to the control signal information generated from the central control center according to an aspect of the present invention for solving the above problems by receiving the control signal information from the central control center, A relay node for transmitting the control signal information to a plurality of controller nodes that control security and the like to control, receiving surveillance information such as security from a plurality of controller nodes, and transferring the received monitoring information to the central control center; Receiving the control signal information to control the security light jurisdiction from the repeater node, to control the security light in response to the control signal information, generate monitoring information monitoring the security light jurisdiction to the central through the repeater node And a plurality of controller nodes transmitting to a control center, wherein the repeater node and the plurality of controller nodes form a tree-network structure, and when the controller node transmits or receives the control signal information or monitoring information. If it is determined that the state of the data transmission path to be used is inferior, after forming an alternative data transmission path in addition to the data transmission path currently in use, characterized in that for transmitting and receiving the control signal information and monitoring information through the alternative data transmission path. .

In particular, the control signal information and the monitoring information transmitted and received between the relay node and the controller node or between the upper node and the lower node of the controller node in the form of a frame having a different structure according to the transmission purpose.

In particular, when searching for a controller node for forming a data transmission path used for transmission and reception of the control signal information and the monitoring information, the control signal includes a header field, an address field, and an error confirmation field, and the control signal through the data transmission path. It consists of a header field, an address field, a data field, and an error confirmation field when transmitting and receiving information and the monitoring information, and a header field, an address field, and an error confirmation field when confirming a response according to the reception of the control signal information and the monitoring information. It may include a frame structure consisting of.

In particular, when the frame is transmitted and received, the destination MAC address information (MAC Dst Addr) and group ID (Group ID) information that the node already knows may be included in the error confirmation field of the frame.

In particular, the address information (NWK Src Addr) for the first starting node of the data frame or the address information (NWK Dst Addr) for the final destination node of the data frame, which are public information known to the plurality of controller nodes and the relay node, are included in the frame. Can be excluded from the transmission.

According to another aspect of the present invention for solving the above problems, at least one repeater and a plurality of controller nodes to control a plurality of security lights according to the control signal information generated from the central control center wireless network control method is the controller A node transmits a node search frame for node search to a plurality of controller nodes or repeater nodes belonging to a plurality of different wireless network groups adjacent to the node, and the node search frame from a plurality of controller nodes or repeater nodes adjacent to the node. A radio network group selecting step of selecting a radio network group to which a response frame according to transmission of the radio network is to be connected; Check received signal strength information and routing level information of the plurality of controller nodes or repeater nodes from the response frame received by the controller node, and transmit data between the plurality of controller nodes or between the controller node and the repeater node in the selected wireless network group. A wireless network group access step of generating a routing table and then creating a routing table according to the formed data transmission path; A controller that transmits a data frame including control signal information or monitoring information for monitoring the security light through the data transmission path so that the controller node controls a security light having jurisdiction based on the routing table, and receives the data frame. A data transmission and reception step of receiving a response frame according to transmission of the data frame from a node or a repeater node; And when it is determined that the communication state of the currently used data transmission path is poor through the response frame received by the controller node, the received signal strength information and routing level information in the plurality of response frames received through the plurality of adjacent paths, respectively. And after comparing, selecting an adjacent controller node having the highest received signal strength and having the lowest routing level to form an alternate data transmission path with the adjacent controller node.

More preferably, an uplink routing table including beer address information (MAC Address) of a first upper node existing on the data transmission path; And a downlink routing table in which beer address information of a plurality of lower nodes existing on the data transmission path and network address information (NWK Address) of the lower node to which the control signal information is to be transmitted correspond to each other. have.

In particular, a routing table may further include at least one of the received signal strength information, the routing level information, the transmission failure information and the time information for the upper node and the lower node existing on the data transmission path.

More preferably, it may further include a routing table updating step of updating the routing table to transmit the data frame through the alternate data transmission path between a plurality of controller nodes or between a controller node and a repeater node.

More preferably in the plurality of controller nodes An uplink routing table updating process in which a lower node updates an uplink routing table through a response of the data frame; Parent nodes in the plurality of controller nodes are connected through the alternate data transmission path. And updating a downlink routing table to update the downlink routing table through the received data frame, as a data frame is received from the lower node.

More preferably, the controller node which wants to access the wireless network broadcasts a node search frame to a plurality of controller nodes or repeater nodes adjacent thereto, and receives the broadcast node search frame and receives the broadcast node search frame. A wireless network access start process of receiving a response frame according to transmission of the node search frame from a node; The controller node acquires group ID information for a wireless network group to which a plurality of controller nodes or repeater nodes adjacent to each other are received through the received response frame, and checks the obtained group ID information to identify a wireless network group to which the controller node is to be connected. And selecting a wireless network group selecting step.

More preferably, the controller node receives a response frame from the plurality of adjacent controller nodes or relay nodes, respectively; A node selection process of comparing the received signal strength information and the routing level information in the plurality of response frames received by the controller node to select an adjacent controller node or a relay node having the highest received signal strength and the lowest routing level; Forming a data transmission path with the adjacent controller node or the repeater node selected by the controller node, generating a routing table according to the data transmission path, and accessing the wireless network group; It may include a step.

The wireless network structure and control method of the security lamp according to the present invention can provide a wireless network that can actively cope with changes in the surrounding environment and is easy to implement by applying a table-based routing method suitable for a security lamp system.

In addition, the wireless network structure and the control method according to the present invention, when the current communication path is unavailable due to the unexpected sudden occurrence of an obstacle or a sudden change in the propagation characteristics, transmission of the alternative data formed according to the path update process By delivering information quickly through the path, the wireless network can be maintained continuously.

In addition, the wireless network structure and the control method according to the present invention provides a frame having a structure suitable for the transmission purpose, including the already known information in the error confirmation field and excludes the already disclosed information from the frame transmission By using to minimize the length of the frame, it is possible to improve the frame rate in the wireless network.

In addition, the wireless network structure and the control method according to the present invention can easily transmit data even in a region where the mobility of the nodes in the wireless network is small, without a good infrastructure infrastructure similar to the security network.

1 is a view showing a remote control system for the security lamp including a wireless network structure of the security lamp according to the prior art.
2 is a schematic diagram showing the structure of a wireless network group, such as security according to an embodiment of the present invention.
3 is a diagram illustrating a frame structure transmitted and received in a wireless network such as the security of the present invention.
4 is a flowchart illustrating uplink transmission of a data frame through a controller node in a method for controlling a wireless network such as security according to another embodiment of the present invention.
5 is a flowchart illustrating downlink transmission of a data frame through a repeater node in a method for controlling a wireless network such as security according to another embodiment of the present invention.
FIG. 6 is a diagram illustrating a process of accessing a wireless network of a controller node in the wireless network control method of FIG. 4.
7 is a diagram illustrating a routing protocol based on a routing table in a method for controlling a wireless network such as security according to another embodiment of the present invention.
8 is a diagram illustrating a transmission path update through an alternative data transmission path in a wireless network control method such as security 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 so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

2 is a schematic diagram showing a structure of one wireless network group among wireless networks, such as all security, according to an embodiment of the present invention. In this case, the aforementioned wireless network group may be implemented in various forms, and a plurality of groups may exist according to actual environments.

As shown in FIG. 2, the structure of the wireless network group of the security lamp of the present invention includes a repeater node 100 and a plurality of controller nodes 200 connected to the repeater node 100. The controller node 200 has a tree structure together with the repeater node 100. In this case, since the upper node or the lower node in the plurality of controller nodes 200 is a relative concept, it is obvious that the upper node or the lower node may be changed according to which node the reference node is.

The repeater node 100 receives the control signal information for controlling a plurality of security lights from the central control center 20 through the communication network, and receives the control signal information received by the corresponding controller node 200 that controls the security lights to be controlled. To pass. In addition, the repeater node 100 receives monitoring information monitoring each security light from a plurality of controller nodes 200, and transmits the monitoring information to the central control center 20 through a communication network.

The controller node 200 receives the control signal information generated from the central control center 20 through the relay node 100 to control security lights according to the control signal information, and monitors a state of a plurality of security lights having jurisdiction. The monitoring information is transmitted to the central control center 20 through the relay node 100.

Accordingly, the relay node 100 receives a data frame including control signal information from the plurality of controller nodes 200 to the controller node 213 which is the final destination node through the lower nodes 220, 221, and 222. The lower node 213, which is a starting node among the controller nodes 200, transmits data through a data transmission path set between a plurality of controller nodes, and provides security through upper nodes 222, 221, and 220 existing on the data transmission path. The monitored monitoring information is transmitted to the relay node 100 which is a destination node through the data transmission path. In this case, when the relay node 100 transmits the control signal information, there is no regularity, whereas when the controller node 200 transmits the monitoring information, it may be performed whenever a certain period or event occurs. have.

On the other hand, when the communication state of the data transmission path formed between the plurality of controller nodes or between the relay node and the controller node is poor, the controller node or the repeater node to transmit the data frame through the data transmission path is the data currently in use An alternative data transmission path is formed in addition to the transmission path, and the control signal information or monitoring information is transmitted through the alternative data transmission path.

For example, when the lower node 223 of the controller node 200 transmits the data frame including the monitoring information to the relay node 100, the lower node 223 of the controller node 200 is itself. Monitoring with the relay node 100 through the first parent node 222, the second parent node 221 and the third parent node 220 of the controller node 200 through the data transmission path 1a being connected to Send a data frame containing information. At this time, if the communication state of the data transmission path 1a formed between the lower node 223 of the controller node 200 and the first upper node 222 of the controller node 200 is poor, the lower node 223 Replaces the currently used data transmission path 1a with an alternative data transmission path 1b with the second higher node 221, and transmits a data frame through the formed alternative path 1b.

In addition, while the lower node 213 of the controller node 200 is transmitting the data frame including the monitoring information through the data transmission path 2a with the upper node 222 of the controller node 200, the current lower node If the communication state of the data transmission path 2a connected to 213 is poor in data transmission such as a frame transmission failure, the lower node 213 forms an alternate path 2b between itself and another adjacent upper node 211. The data frame including the monitoring information is transmitted through the alternative path 2b.

On the other hand, the transmission and reception of data and various information necessary for the operation and maintenance of the wireless network in the wireless network group, such as security is transmitted through the form of a frame, the frame has a different structure depending on the purpose of delivery.

Hereinafter, the frame structure transmitted and received in the present invention will be described in detail with reference to FIG. 3.

3 is a diagram illustrating a frame structure transmitted and received in a wireless network such as the security of the present invention.

FIG. 3 (a) shows a structure of a node search and response frame for searching for neighboring controller nodes and repeater nodes previously connected to a wireless network to access a wireless network group such as security, and attempting a wireless network connection through the same. 3 (b) shows a data frame including the control signal information or monitoring information for transmitting control signal information or monitoring information to the repeater node 100 or the controller node 200 after wireless network connection. 3 (c) shows the structure of the response frame for confirming the response to the reception of the data frame including the control signal information or the monitoring information.

As shown in FIG. 3 (a), the node search frame and the response frame according to the present invention have a structure including a header field, an address field, and an error check field. Looking at the structure of such a frame in more detail, the header field includes the header information of the transport frame, and largely includes Preamble & Sync, Len, Frame Control, and Seq Num. The Preamble & Sync is used to synchronize the transmitted frames, the Len represents the length of the transmitted frame, and the Frame Control is used to set the type and various modes of the transmission frame. Seq Num represents a transmission order of frames.

The address field following the header field is a field indicating address information necessary for transmitting a frame and includes a MAC Src Addr, a BCN Control, and a Group ID. The MAC Src Addr indicates address information of a source controller node for peer-to-peer communication, and the BCN Control is used to set a system mode required for wireless network control and maintenance. ID represents ID information for identifying a plurality of wireless network groups.

In addition, the error confirmation field following the address field includes a CRC and is used to detect an error of a received transmission frame.

On the contrary, as shown in FIG. 3 (b), the data frame used to transmit control signal information or monitoring information has a structure including a header field, an address field, a data field, and an error confirmation field.

In this case, the frame has a structure similar to the frame structure described above with reference to FIG. 3 (a), but NWK Src or Dst Addr is added to the address field, BCN Control and Group ID are omitted, and the address field and the error check are performed. The data field (Payload) is added between the fields.

Hereinafter, the same parts as those of the frame structure described with reference to FIG. 3A will be omitted, and only differences will be described.

The NWK Src or Dst Addr added to the address field indicates an address of an initial source node or a final destination node of a data frame in a wireless network structure that requires routing. The data field included between the address field and the error confirmation field includes monitoring information for monitoring security and control signal information for controlling the security and the like.

Alternatively, as shown in (c) of FIG. 3, the response frame according to the reception of the data frame is used to confirm the reception response of the data frame including the control signal information or the monitoring information, and includes a header field, an address field, and an error. It consists of a structure containing a confirmation field. Unlike the frame structure described above with reference to FIG. 3 (b), the frame structure has a structure in which NWK Src or Dst Addr included in the address field is omitted, and BCN Control described above with reference to FIG. 3 (a) is added. The data field is omitted.

In particular, in the frame structure of FIG. 3 (b), when the data frame is used to communicate between a plurality of controller nodes or between the controller node and the repeater node, the information already known to the controller node or the repeater node is The information is included in the error checking field of the frame and transmitted (Hiding Data Technique), and information already disclosed to all nodes in the wireless network group is excluded during the transmission of the frame (Omitting Data Technique).

For example, when peer-to-peer communication is performed to exchange information between adjacent controller nodes or between a controller node and a repeater node, the controller node or repeater node to which the information is to be transmitted is already known. MAC Dst Addr and Group ID are applied to CRC calculation used for error detection. At this time, the receiving node that receives the data frame automatically determines the suitability and error of the received data frame by calculating the CRC of the received data frame using its own address, MAC Dst Addr and Group ID information. . In this case, since the MAC Dst Addr is not required in the response frame of the data frame shown in FIG. 3 (c), only the Group ID is applied to the CRC operation.

As described above, in the case of the Hiding Data scheme in which the information already known is included in the CRC and transmitted, the length of a frame increased due to unnecessary information transmission is reduced, thereby increasing the data transmission speed of another controller node or a repeater node disposed in the neighborhood. This can simplify the communication complexity of the entire wireless network.

On the other hand, when information transfer between a plurality of controller nodes or between a controller node and a repeater node is performed in a routing-based networking method instead of the above-described peer-to-peer method due to the physical limitation of the communication distance, information transmission is performed. The data frame is transmitted by additionally applying the Omitting Data technique, which omits information already disclosed in the Hiding Data technique. For example, if a data frame containing surveillance information is an uplink starting from a controller node and finally passed to one or more parent nodes to a repeater node, the final destination is always the repeater node. Since all of the controller nodes are already disclosed, the controller node omits the final destination address NWK Dst Addr from the address field in the data frame and transmits it. In addition, when a data frame including control signal information is a downlink starting from the relay node and passed through one or more lower nodes to a final destination controller node, the first starting point of the data frame is always the relay node, Since this fact is already disclosed to all relevant controller nodes, the relay node omits and transmits address information (NWK Src Addr) for the repeater node that is the first source in the address field of the data frame.

Hereinafter, an uplink transmission method of a data frame through a controller node in a wireless network control method such as security according to another embodiment of the present invention will be described in detail.

As shown in FIG. 4, first, a controller node belongs to a plurality of different wireless network groups to access a wireless network group, and transmits a node search frame to a neighboring controller node connected to the same, and a response frame according to the transmitted node search frame. The radio network group to receive and select the access to select (S210).

As such, when the controller node selects a wireless network group to which the controller node is to be connected, the controller node checks received signal strength information and routing level information of a plurality of adjacent controller nodes from the response frame received by the controller node to form a data transmission path. In operation S220, an uplink routing table UL is generated according to the data transmission path.

Therefore, the controller node transmits the data frame including the surveillance information to the relay node which is the final destination through the previously formed data transmission path, and receives the response frame according to the transmission of the data frame (S230). At this time, the controller node transmitting the data frame not only receives the first response frame for the transmission of the data frame, but also receives a second response frame from a plurality of adjacent neighboring controller nodes.

Thereafter, it is determined whether the communication state of the data transmission path currently being used is good through the response frame received by the controller node (S240). If the controller node confirms that the data frame is smoothly received through the response frame received, it is determined that the communication state of the currently used data transmission path is good, and the data is transmitted through the same data transmission path when the next data frame is transmitted. Send a frame.

In contrast, when the first response frame is not received or the received signal strength obtained from the received first response frame is greater than the received signal strength obtained from the second response frame. Low, The routing level obtained from the first response frame is greater than the routing level obtained from the second response frame. If high, the controller node determines that the communication state of the currently used data transmission path is not good.

Accordingly, the controller node selects an adjacent controller node having the highest received signal strength information and the lowest routing level information among the second response frames received, thereby forming an alternative data transmission path (S250).

Accordingly, the controller node updates the uplink routing table according to the alternative data transmission path (S260), and then transmits a data frame including the monitoring information through the changed uplink routing table (S270).

In addition, the relay node receives the control signal information generated in the central control center of the wireless network control method, such as security according to an embodiment of the present invention will be described in detail with respect to the process of delivering to the final destination controller node.

5 is a flowchart illustrating downlink transmission of a data frame through a repeater node in a method for controlling a wireless network such as security according to another embodiment of the present invention.

As shown in FIG. 5, in order to configure a downlink routing table (DL) for transmitting a data frame including control signal information, the relay node monitors security and the like from a plurality of controller nodes belonging to a wireless network group. A data frame including information is received (S310).

Accordingly, the repeater node generates or updates a downlink routing table based on the information included in the received data frame (S320), and then transmits the data frame received by the repeater node to the central control center (S330). .

Thereafter, the repeater node checks whether it receives a data frame including control signal information from the central control center (S340).

If the repeater node does not receive a data frame including control signal information for security control from the central control center, the repeater node performs the step S310 again. In contrast, when the relay node receives a data frame including control signal information from the central control center, a downlink routing table is searched to find a final destination controller node for transmitting control signal information included in the data frame. Search (S350).

At this time, when the relay node retrieves the relevant information about the final destination controller node through the downlink routing table, it transmits a data frame including the control signal information to the final destination controller node (S370). If the repeater node fails to retrieve the information of the last destination controller node in the downlink routing table, the repeater node transmits a data frame including control signal information received from the central control center to the destination controller node. I never do that. At this time, the relay node may transmit a response frame including the transmission failure of the data frame to the central control center.

Wireless network access process

Hereinafter, a wireless network access process of a controller node in a wireless network control method such as the security of the present invention will be described in detail with reference to FIG. 6.

FIG. 6 is a diagram illustrating a process of accessing a wireless network of a controller node in the wireless network control method of FIG. 4.

As shown in FIG. 6, first, the controller nodes 600 and 0x11 which are to be connected to the wireless network are already connected to the wireless network. The node search frame is broadcasted to adjacent controller nodes 610 (0xA0) and 620 (0xB0) (S401), and then the adjacent controller nodes 610 (0xA0) and 620 (0) are located at a distance at which communication is possible. 0xB0)), the response frames for the node search frame are received (S401), and the radio network access procedure is started.

Radio network group information (Group IDs) to which the neighboring controller nodes 610 (0xA0) and 620 (0xB0) belong are received through response frames according to the reception of the node search frame received by the controller nodes 600 and 0x11. Acquire. If the obtained wireless network group information is the same, the controller node 600 (0x11) selects a wireless network group based on the information currently obtained (S402). On the other hand, when the different wireless network group information is obtained, the controller node 600, 0x11 selects one wireless network group according to an internal procedure for searching for the best wireless network group (S402). At this time, the internal procedure criteria for the wireless network group selection may be variously set according to the area where the wireless network, such as security is installed.

Subsequently, the controller nodes 600 and 0x11 receive received signal strength of each path through response frames according to transmission of the node search frame transmitted by the adjacent controller nodes 610 (0xA0) and 620 (0xB0). After obtaining RSSI information and routing depth information and comparing each other (S403), among the adjacent controller nodes 610 (0xA0) and 620 (0xB0), the highest received signal strength and the lowest routing level are obtained. One controller node is selected and a data transmission path is set accordingly (S404).

Thereafter, the controller nodes 600 and 0x11 to access the wireless network generate an uplink routing table based on the set data transmission path (S405) to complete the wireless network connection of the controller nodes 600 and 0x11. do.

The wireless network access process is simple because the access procedure is simple and unique to each node because wireless network access is not assigned a separate network address for maintaining the wireless network, compared to other existing wireless network systems. It is possible to maintain and control the wireless network only with a unique address.

On the other hand, the controller node 600, 0x11 transmits a data frame including the monitoring information to the upper node 610 (0xA0) of the controller node 600, 0x11 after accessing the wireless network through the established data transmission path. In operation S406, a response frame according to the transmission of the data frame is received. At this time, the upper node 610 (0xA0) creates or updates a downlink routing table through the received data frame (S407), and establishes the data transmission path set after the wireless network connection. It keeps going.

Table-based Routing Protocol

7 is a diagram illustrating a routing protocol based on a routing table in a method for controlling a wireless network such as security according to another embodiment of the present invention.

As shown in FIG. 7, the relay node 0x07 and the controller nodes 0x87, 0x54, 0x16, 0x21, 0x32, 0x72, and 0x93 are based on the routing table UL and DL defined by the routing procedure. Send and receive frames. In this case, the routing tables UL and DL are uplink routings used for transmission of a data frame from the controller nodes 0x87, 0x54, 0x16, 0x21, 0x32, 0x72 and 0x93 to the relay node 0x07. Table (UL) and vice versa downlink routing table (DL) used for the transmitted data frame.

First, a method of configuring the uplink routing table for transmitting a data frame including surveillance information from the controller nodes to the relay node and a routing procedure (protocol) through the same will be described.

In the case of uplink in a wireless network group such as security, the final destination for the transmission of all monitoring information is always the relay node which controls the controller nodes, and the transmission paths between the controller nodes are sequential from the lower node to the upper node. Since it is configured in the form, the uplink routing table of the controller nodes basically includes only the beer address information (MAC Dst Addr) of the first higher node located on the data transmission path of each node. At this time, since the repeater node is the final destination for the transmission of all monitoring information, the uplink routing table does not exist. On the other hand, such beer information is first obtained through the initial wireless network connection of the controller nodes, and then modified through the updating of the routing table.

For example, a case in which a 0x93 node, which is the lowest node in any particular branch, transmits a data frame including monitoring information for monitoring security to the relay node 0x07.

First, the 0x93 node transmits the data frame to its parent node, 0x32 node, according to the uplink routing table that stores the currently transmitted data transmission path.

Thereafter, the 0x72 and 0x32 nodes located at the communicationable distance receive the data frame transmitted from the 0x93 node. First, the 0x72 node confirms that the data frame is received through a data transmission path not connected to itself through analysis of the received data frame, and deletes the data frame.

However, in contrast, the 0x32 node analyzes the received data frame and confirms that the data frame has been received through a data transmission path connected to the 0x32 node, and pre-stored beer information is stored in the uplink routing table. According to (0x21), the data frame received by the parent node 0x21 node is routed.

By repeating the above process, the lowest node 0x93 node can transfer the data frame to the repeater node 0x07, which is the highest node.

Next, a method of configuring the downlink routing table for transmitting a data frame including control signal information from the relay node to the controller nodes and a routing procedure (protocol) through the same will be described.

In the case of downlink in a wireless network group such as security, an initial source for transmitting all control signal information is the relay node that always controls the controller nodes, and transmission paths between the controller nodes are sequentially transmitted from an upper node to a lower node. In the downlink routing table of the relay node and the controller nodes, MAC Dst Addr and the final destination node of the first subnode are basically located in the transmission path of each node. Network address information (NWK Dst Addr) is included in the form corresponding to each other. At this time, the downlink routing table does not exist in the lowest nodes located in any particular branches of the controller nodes. Meanwhile, the beer address information and the network address information stored corresponding thereto are generated through the initial reception of a data frame including monitoring information, and then modified through an update procedure of a routing table.

For example, a case in which the repeater node 0x07 transmits a data frame including control signal information to 0x16, which is the lowest controller node among certain specific branches, will be described.

First, the repeater node 0x07 checks the existence of network address information for the 0x16 node, which is the final destination of the data frame, in a downlink routing table that prestores the state of the currently connected data transmission path.

If the downlink routing table determines the existence of network address information for the last destination 0x16 node, the 0x07 node includes control signal information as a 0x87 node in which a data transmission path is formed according to the downlink routing table. Send a data frame.

Thereafter, the 0x87 node receiving the data frame from the 0x07 node confirms that it is not the final destination through analysis of the received data frame, and then routes the data frame to the 0x16 node through the downlink routing table. . At this time, the data frame transmitted to the 0x16 node is received not only by the 0x16 node but also by the 0x72 node and the 0x54 node which are located on the communication possible distance. Accordingly, the 0x72 node, the 0x54 node, and the 0x16 node determine whether to execute a command or route to a lower node through the data frame analysis received by the 0x72 node, the 0x54 node, and the 0x16 node, respectively.

First, the 0x72 node confirms that the data frame has been received through a data transmission path not connected to the node, and deletes the received data frame.

In addition, the 0x54 node, after analyzing the received data frame, confirms that the data frame has been received through the data transmission path connected thereto, but confirms that the data frame is not the final destination, and further, the downlink routing table. After confirming that there is no controller node lower than itself, the controller deletes the received data frame like the 0x72 node.

However, unlike this, the 0x16 node analyzes the received data frame and confirms that the data frame has been received through the data transmission path connected to the node, and confirms that the data frame is the final destination, and then includes the data frame in the data frame. The corresponding security light is controlled according to the control signal information.

In addition, the routing tables UL and DL used for routing of the data frames include at least one of received signal strength information, routing level information, transmission failure count information, and time information for each data transmission path, in addition to the aforementioned address information. can do.

As a result, the routing table can be configured in real time through the initial wireless network connection and subsequent transmission of data frames, and by minimizing the size of the table, it is possible to minimize the memory usage of each node. In addition, since the routing table has a simple table component, it is possible to stably and continuously maintain a wireless network by quickly processing a table update due to a data transmission path change in the future.

Data transmission path update process

Hereinafter, referring to FIG. 8, a process of updating a data transmission path of a wireless network control method such as security according to another embodiment of the present invention will be described in detail. FIG.

8 is a view showing an alternative data transmission path of a wireless network control method such as security according to another embodiment of the present invention.

As shown in FIG. 8, the routing table of the present invention may be updated through data frames and response frames exchanged between a relay node and a controller node or controller node.

More specifically, the process of changing the transmission path through updating the routing table will be described.

The controller node transmits the data frame including the monitoring information monitoring the security, etc. to the relay node to the upper node through the currently set data transmission path whenever the event or the event occurs periodically, and the first response according to the transmission of the data frame. Receive a frame. At this time, the controller node receives the second response frames from not only the upper node but also adjacent nodes located in a communicable distance.

At this time, the controller node checks the communication status with the adjacent nodes existing on the other path, in addition to the data transmission path currently connected from the received response frames. As a result, the communication state with neighbor nodes existing on other paths after the preset time is better than the communication state with the upper node existing on the currently connected data transmission path, or the communication state of the currently connected data transmission path. If the controller is in a transmission / reception impossible state, the controller node changes the transmission path to the adjacent node having the best communication state by updating an uplink routing table, and subsequently replaces the data frame including the monitoring information with the changed data. It transmits to the adjacent node through the transmission path.

Meanwhile, the neighbor node updates the downlink routing table by receiving the data frame, and then transmits a data frame including control signal information downward to the newly configured controller node.

For example, look at the path change process for forming alternate data transmission paths between 0x72 and 0x87 nodes.

First, the controller node 0x72 receives the first response frame from the currently connected 0x32 node in the form of a response of the data frame, and at the same time, the second node from the 0x87 node, the 0x16 node, and the 0x93 node, which is within the valid communication range, is received. Receive response frames. Subsequently, the 0x72 node receiving the first response frame and the second response frames compares the received signal strength information and the routing level information of the received response frames with each other to determine whether the data transmission path is changed.

If the current data transmission path state between 0x72 and 0x32 nodes is worse than the path between 0x72 and 0x87 nodes, or between 0x72 and 0x16 nodes, or between 0x72 and 0x93 nodes, the 0x72 node Selects a path with the 0x87 node having the best communication state among the paths as an alternate data transmission path. Thereafter, the 0x72 node modifies the uplink routing table according to the path change, and transmits a data frame including the surveillance information to the 0x87 node through the updated uplink routing table during the next frame transmission.

Meanwhile, the 0x72 node and the newly set 0x87 node update the downlink routing table by receiving the data frame.

For another example, the path change process for forming an alternate data transmission path between the 0x93 and 0x72 nodes may go through the same procedure as described above.

As a result, the above-described data transmission path update process can simplify the update procedure by using a general data frame and a response frame according to data frame transmission without using a separate dedicated routing frame, thereby maintaining an efficient wireless network. Is possible.

The wireless network structure and the control method thereof according to the present invention can provide a wireless network that can actively cope with changes in the surrounding environment and is easy to implement by applying a table-based routing scheme that is most suitable for a security lighting system.

In addition, the wireless network structure and the control method of the security light according to the present invention, when the current communication path is disabled due to the unexpected sudden occurrence of an obstacle or a sudden change in the propagation characteristics, the replacement data according to the data transmission path update process By delivering data frames quickly through the transmission path, it is possible to maintain the wireless network continuously.

In addition, the wireless network structure and the control method according to the present invention provides a frame having a structure that is most suitable for the purpose of transmission, include the information already known in the error confirmation field and exclude the already disclosed information from the frame transmission By minimizing the length of the frame using the scheme, the transmission rate of the frame in the wireless network can be improved.

In addition, the wireless network structure and the control method according to the present invention can easily transmit data even in a region where the mobility of the nodes in the wireless network is small, without a good infrastructure infrastructure similar to the security network.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Do.

100: repeater node
200: a plurality of controller nodes in a wireless network group

Claims (12)

In the wireless network structure of the security lamp for controlling a plurality of security lights in accordance with the control signal information generated from the central control center,
Receives the control signal information from the central control center, transfers the control signal information to a plurality of controller nodes that control the security, etc. to control, and receives and receives monitoring information, such as security jurisdiction from a plurality of controller nodes Repeater node for transmitting the monitoring information to the central control center;
Receiving the control signal information to control the security light jurisdiction from the repeater node, to control the security light in response to the control signal information, generate monitoring information monitoring the security light jurisdiction to the central through the repeater node Including a plurality of controller nodes for transmitting to the control center,
The repeater node and the plurality of controller nodes form a tree-network structure,
If the controller node determines that the state of the data transmission path used to transmit and receive the control signal information or the monitoring information is poor, the controller node forms an alternative data transmission path in addition to the data transmission path currently being used, and then uses the alternative data transmission path. Wireless network structure, such as security, characterized in that for transmitting and receiving the control signal information and monitoring information.
The method of claim 1,
The control signal information and the monitoring information
Wireless network structure, such as a frame having a different structure according to the purpose of transmission and transmission between the relay node and the controller node or between the upper node and the lower node of the controller node.
The method of claim 2,
The structure of the frame
When searching for a controller node for forming a data transmission path used for transmitting and receiving the control signal information and the monitoring information, it consists of a header field, an address field and an error confirmation field,
In the transmission and reception of the control signal information and the monitoring information through the data transmission path, it is composed of a header field, an address field, a data field and an error confirmation field,
And a header field, an address field, and an error confirmation field when confirming a response according to the reception of the control signal information and the monitoring information.
The method of claim 3,
When transmitting and receiving the frame, the wireless network structure such as the destination address information (MAC Dst Addr) and the group ID (Group ID) information already known to the node is included in the error confirmation field of the frame.
The method of claim 3,
NWK Src Addr for the originating node of a data frame or NWK Dst Addr for the final destination node of a data frame, which are publicly known to a plurality of controller nodes and repeater nodes, are not included in the frame. Wireless network structure, such as security, characterized in that excluded from the transmission.
In at least one repeater and a plurality of controller nodes to control a plurality of security lights in accordance with the control signal information generated from the central control center Wireless network control method,
The controller node transmits a node search frame for node search to a plurality of controller nodes or relay nodes belonging to a plurality of different radio network groups adjacent to the controller node, and the node from the plurality of controller nodes or repeater nodes adjacent to the controller node. A radio network group selecting step of receiving a response frame according to transmission of a search frame and selecting a radio network group to be connected;
Check received signal strength information and routing level information of the plurality of controller nodes or repeater nodes from the response frame received by the controller node, and transmit data between the plurality of controller nodes or between the controller node and the repeater node in the selected wireless network group. A wireless network group access step of generating a routing table and then creating a routing table according to the formed data transmission path;
A controller that transmits a data frame including control signal information or monitoring information for monitoring the security light through the data transmission path so that the controller node controls a security light having jurisdiction based on the routing table, and receives the data frame. A data transmission and reception step of receiving a response frame according to transmission of the data frame from a node or a repeater node; And
If it is determined that the communication state of the currently used data transmission path is poor through the response frame received by the controller node, the received signal strength information and routing level information in the plurality of response frames received through the plurality of adjacent paths are compared with each other. An alternative path forming step of selecting an adjacent controller node having the highest received signal strength and having the lowest routing level to form an alternative data transmission path with the adjacent controller node;
Wireless network control method such as security comprising a.
The method of claim 6,
The routing table
An uplink routing table including beer address information (MAC Address) of a first upper node existing on the data transmission path;
A downlink routing table in which beer address information of a plurality of lower nodes existing on the data transmission path and network address information (NWK Address) of a lower node to which the control signal information is to be transmitted correspond to each other;
Wireless network control method such as security comprising a.
The method of claim 7, wherein
The routing table
And at least one of the received signal strength information, the routing level information, the transmission failure information, and the time information for the upper node and the lower node existing on the data transmission path. .
The method of claim 6,
Updating the routing table to transmit the data frame through the alternate data transmission path between a plurality of controller nodes or between a controller node and a repeater node;
Wireless network control method, such as characterized in that it further comprises a security.
10. The method of claim 9,
The routing table update step
An uplink routing table updating process in which a lower node in the plurality of controller nodes updates an uplink routing table through a response of the data frame;
A downlink routing table updating process of updating a downlink routing table through the received data frame as upper nodes in the plurality of controller nodes receive data frames from the lower node through the alternate data transmission path;
Wireless network control method such as security comprising a.
The method of claim 6,
The wireless network group selection step is
The controller node which wants to access the wireless network broadcasts a node search frame to a plurality of controller nodes or repeater nodes adjacent to the wireless network, and receives the node from a plurality of adjacent controller nodes or repeater nodes that receive the broadcasted node search frame. A wireless network connection start process of receiving a response frame according to transmission of a search frame;
The controller node acquires group ID information for a wireless network group to which a plurality of controller nodes or repeater nodes adjacent to each other are received through the received response frame, and checks the obtained group ID information to identify a wireless network group to which the controller node is to be connected. Selecting a wireless network group selection process;
Wireless network control method such as security comprising a.
The method of claim 6,
The wireless network group access step is
A response frame receiving process in which the controller node receives response frames from a plurality of adjacent controller nodes or repeater nodes, respectively;
A node selection process of comparing the received signal strength information and the routing level information in the plurality of response frames received by the controller node to select an adjacent controller node or a relay node having the highest received signal strength and the lowest routing level;
A wireless network group access process for forming a data transmission path with the adjacent controller node or the repeater node selected by the controller node, generating a routing table according to the data transmission path, and accessing the wireless network group;
Wireless network control method such as security comprising a.

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