كاهش انرژي مصرفي پروتكل هاي مبتني بر زنجير در شبكه هاي حسگر بي سيم مقياس بزرگ

Reducing Energy Consumption for Chain-Based Routing Protocols in Large-Scale Wireless Sensor Networks

Sensor networks consisting of nodes with limited battery power and wireless communications are deployed to collect useful information from the field. Gathering sensed information in an energy efficient method is critical to enhancing the network efficient lifetime in the chain-based wireless sensor networks. In this research, we present three methods for the chain correction in the PEGASIS protocol. One of the main points of weakness of the PEGASIS protocol is the probability of early death of some nodes in the network, its reason is the existence of the long edges in the chain. The proposed methods in this research prevent the long transmission between sensors by using distributed algorithms and correcting the long edges of the chain. Also, we presented a chain correction method in the networks in which nodes perform their operations without awareness of their own locations or that of other network. These corrections lead to reduction of the energy consumed by sensors. This reduction of the energy consumed lead to enhancing the sensors lifetime. The improvement of nodes lifetime increases the full coverage time of the network. The increase of full coverage time of the network leads to improve availability, reliability and safety in the large scale networks. Finally, the proposed methods are compared with the PEGASIS protocol and intra-grid PEGASIS method. Simulation results show that in the proposed methods there are significant improvements in the network efficient lifetime and the full coverage time of the network.

Sensor networks consisting of nodes with limited battery power and wireless communications are deployed to collect useful information from the field. Gathering sensed information in an energy efficient method is critical to enhancing the network efficient lifetime in the chain-based wireless sensor networks. In this research, we present three methods for the chain correction in the PEGASIS protocol. One of the main points of weakness of the PEGASIS protocol is the probability of early death of some nodes in the network, its reason is the existence of the long edges in the chain. The proposed methods in this research prevent the long transmission between sensors by using distributed algorithms and correcting the long edges of the chain. Also, we presented a chain correction method in the networks in which nodes perform their operations without awareness of their own locations or that of other network. These corrections lead to reduction of the energy consumed by sensors. This reduction of the energy consumed lead to enhancing the sensors lifetime. The improvement of nodes lifetime increases the full coverage time of the network. The increase of full coverage time of the network leads to improve availability, reliability and safety in the large scale networks. Finally, the proposed methods are compared with the PEGASIS protocol and intra-grid PEGASIS method. Simulation results show that in the proposed methods there are significant improvements in the network efficient lifetime and the full coverage time of the network.