Research On Reliable Routing Protocol For Industrial Wireless Sensor Networks

The wiring cost in the industrial enviroment is so large, in order to save the energy and implement the novel measurement and control system in industrial field, the wireless industrial technology emerges as optimization of controling. This technology has strong ability of preventing interference, low energy, real-time communication, which is a special sensor networks.How to apply wireless sensor networks to industrial control field steadily and reliably is one of the research emphasis at present. Meanwhile the research on the network layer is focuses on the routing research.This Paper offers a routing strategy,which is improved from the minimum hop forwarding routing ,at the same time,used a middle layer CBF_A,is short for REEP(Reliable Energy Efficient Protocol). REEP makes the use of cross-layer designing method, increasing a middle-layer CBF_A between network layer and MAC layer.This middle-layer, which communicates with MAC layer and Network layer, acquires the routing information and link quality information.Once the next-hop,the network layer determines, lost the data packet sent from the last-hop, a new node will be chosed from the neighbor nodes of the next-hop node to take the place of the next-hop node to deliver the lost data packet through some algorithm. The CBF_A is modified from CBF. The helper admission module and forwarding resolution module are modified. The probability of hop-wise receiving packet successfully p(d) adds in the helper admission algorithm, which is the one metric for the helper nodes; at the other hand, delay factor and p(d) add in the forwarding resolution algorithm. In the network layer, a energy balancing routing based on minimum cost forwarding routing is selected, considering both the min hops and the ratio of Minimum Path-node Residual Energy(MPRE) and Path-Energy(PE). The simulation result shows that the improved strategy can realize data delivering reliably and efficiently energy cost.This routing strategy can be used in the large or middle scale WSNs, with nodes densely deployed.