Self-construction system of wireless sensor network and method for self-construction of wireless sensor network using the same
First Claim
1. A method for self-construction of a cluster tree structure based wireless sensor network (WSN), comprising:
- (A) a network structure determination step of calculating, by a coordinator, which is one of parent devices, a minimum network depth for covering up the entire area of the WSN and the number of devices located within a communication range, and calculating a maximum number of child router devices and a maximum number of child end devices according to a network depth at each tree step to determine a network structure;
(B) a network construction step of selecting, by the parent device at each tree step, the device as a child device with address allocation in response to a subscription request of a device as a child device, and allocating a superframe duration to a child router device among the child devices; and
(C) a data transmission step of searching for, by a router device having data packets, a routing path by means of address comparison between its own address and a final destination address of the packet, and transmitting the packet according to the routing path,wherein step (A) includes;
(A-1) calculating an average communication range and calculating the minimum network depth based on the average communication range;
(A-2) calculating the number of devices located within the average communication range based on the average communication range and the minimum network depth;
(A-3) determining a maximum network depth and the number of tree steps; and
(A-4) calculating the maximum number of child router devices and the maximum number of child end devices according to the network depth at each tree step.
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Abstract
Disclosed is a self-construction system of a wireless sensor network, and a method for self-construction of a wireless sensor network using the same. Also disclosed is a method for self-construction of a cluster tree structure-based wireless sensor network (WSN). The present invention can connect devices distributed densely in a wide area to a network while maintaining the advantages of a conventional tree-structured network, such as the reduction of time required for network construction, traffic by the exchange of control command messages, and a load for a routing path search, and thus can provide a WSN having an improved self-construction performance.
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Citations
18 Claims
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1. A method for self-construction of a cluster tree structure based wireless sensor network (WSN), comprising:
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(A) a network structure determination step of calculating, by a coordinator, which is one of parent devices, a minimum network depth for covering up the entire area of the WSN and the number of devices located within a communication range, and calculating a maximum number of child router devices and a maximum number of child end devices according to a network depth at each tree step to determine a network structure; (B) a network construction step of selecting, by the parent device at each tree step, the device as a child device with address allocation in response to a subscription request of a device as a child device, and allocating a superframe duration to a child router device among the child devices; and (C) a data transmission step of searching for, by a router device having data packets, a routing path by means of address comparison between its own address and a final destination address of the packet, and transmitting the packet according to the routing path, wherein step (A) includes; (A-1) calculating an average communication range and calculating the minimum network depth based on the average communication range; (A-2) calculating the number of devices located within the average communication range based on the average communication range and the minimum network depth; (A-3) determining a maximum network depth and the number of tree steps; and (A-4) calculating the maximum number of child router devices and the maximum number of child end devices according to the network depth at each tree step. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system for self-construction of a cluster tree structure based wireless sensor network (WSN), comprising:
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a coordinator calculating an average communication range of the WSN and the number of devices located within the average communication range and calculating the maximum allowable number of child routers and child devices at each tree step based on the average communication range and the number of devices within the average communication range to determine a multi-step tree network structure; parent devices selecting their child devices through a subscription request from devices belonging to a lower hierarchical tree step, and allocating their selected child devices to their own child devices addresses; and child devices having their own addresses allocated by a parent device belonging to an higher hierarchical tree step through a subscription request process, wherein the child devices include child router devices and child end devices, the child router device includes a router parent selecting unit that selects a parent device candidate group, selects a parent device in the parent device candidate group, and requests subscription to the selected parent device, and the child end device includes an end device parent selecting unit that selects a parent device candidate group, selects the parent device from the parent device candidate group, and requests subscription to the selected parent device. - View Dependent Claims (16, 17, 18)
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Specification