Research On Self-organizing Network Model And Method For Mine Internet Of Things

By targeting at issues such as low Intellectualization, backward Informatization and incomprehensive Safety monitoring which are existing in Mine Safety Production, applying IoT technology, thus improving overall mine safety production environment. In this paper, based on self organization network as the center, focus on the three-dimensional localization algorithm, address assignment algorithm and coverage and topology control in wireless sensor networks. The paper has accomplished the following achievements:1. By using RSSI ranging technology, for reducing the three-dimensional space positioning errors and improving the positioning accuracy perspective, RSSI assisted Coordinate-tetrahedron centroid localization algorithm in three-dimensional space was proposed. Due to the complexity of the reality environment, the cases of unknown node not in the anchor node tetrahedron internal exist. Screening quality RSSI value will be converted to the distance between the unknown nodes to an anchor node. Then calculating and comparing the tetrahedron volume to exclusion. Using the math of centroid iterative to solve tetrahedral which contains unknown node. In addition, a weighted centroid localization algorithm based on RSSI average value is used to resolve the situation does not meet the conditions. Simulation results show that this algorithm positioning error is smaller and the node coverage rate is higher.2. In order to reducing the energy consumption caused by node address and sending message in wireless sensor network, detect redundant nodes and reuse for MAC address assignment in wireless sensor networks was proposed. In this algorithm, the MAC address is divided into cluster address and inner-cluster address by using address multiplexing. Detect redundant nodes and make it dormant before assigning inner-cluster address. In this way, not only reduces the number of nodes involved in assigning address, but also reduces the energy consume of sending message. Then, the inner-cluster address is assigned with different lengths according to remaining energy and the number of neighbors of a node. When the network updates address, redundant nodes can be used to replace of the death node. Simulation results show that the proposed algorithm can efficiently decrease the average address length and communications volume, and extend the life cycle of the network. 3. For Complete coverage is unnecessary in practical application, partial coverage topology control algorithm was proposed. In this algorithm, Pre-setting coverage rate, then determine the distance between neighboring nodes through partial coverage model, and judged redundant nodes through partially covered redundant nodes judgment method. Simulation results show that the proposed algorithm can decrease the number of working nodes, and efficiently extend network lifetime.