Research Of WSN Topology Control Based On Adaptive Mechanism

Topology control of wireless sensor networks is the core issue of wireless sensor network. In wireless sensor network of high-density deployment, network topology control technology through control-based coverage of the node scheduling, power control and other means to reduce the number of active nodes and reducing the node transmission power and reduce channel conflict and reduce the node's energy consumption without affecting the performance of network coverage and connective. so as to extend the network life time.In this paper, to solve energy bottleneck problems in the network and thus extend the survival time of the network, Study from covering controlling, three respects that power controls and combines with and other layers of agreements separately. Paper puts forward a new scheduling algorithm based on node adaptive coverage, non-uniform power control algorithm and with the routing by a combination of topology control mechanisms.First, the node coverage adaptive scheduling algorithm, the node through the blind spot as far as coverage of ways to reduce peak network redundancy, according to local information and ensure network coverage required under the premise of the proliferation of layer-by-layer scheduling order, as far as possible, so that more number of dormant nodes. In the assumption network model Conditions, the algorithm greatly reduced after the implementation of the network redundancy coverage, thereby reducing redundant data due to the burden caused by the network.Second, non-uniform power control algorithm, to enhance the problem of the exacerbating "Hot zone" because of the power control. SINK node step by step through the establishment of the gradient is used to be a control factor of power control. In the reduction of energy consumption and maintain connectivity to find a compromise. The simulation proved that the load balance have been promoted greatly.Third, the combination of routing protocols and topology control mechanisms, due to changes in network topology will affect the routing path length and connectivity between nodes, so the routing protocols and topology control protocol is closely related. Through the weight function and the node type of conversion mechanism in the process of routing node hibernation fully taken into account, routing history, the current energy and other related information, and adjust power with routing adaptively. The using of topology information improves the load balancing of network communication, and extends the survival time of network. The simulation results show topology control and routing protocols combined with the network can greatly extend the survival time, with excellent performance.