Next century challenges: scalable coordination in sensor networks
MobiCom '99 Proceedings of the 5th annual ACM/IEEE international conference on Mobile computing and networking
Geography-informed energy conservation for Ad Hoc routing
Proceedings of the 7th annual international conference on Mobile computing and networking
Negotiation-based protocols for disseminating information in wireless sensor networks
Wireless Networks - Selected Papers from Mobicom'99
Wireless sensor networks: a survey
Computer Networks: The International Journal of Computer and Telecommunications Networking
Directed diffusion for wireless sensor networking
IEEE/ACM Transactions on Networking (TON)
IPDPS '02 Proceedings of the 16th International Parallel and Distributed Processing Symposium
TEEN: ARouting Protocol for Enhanced Efficiency in Wireless Sensor Networks
IPDPS '01 Proceedings of the 15th International Parallel & Distributed Processing Symposium
Energy-Efficient Communication Protocol for Wireless Microsensor Networks
HICSS '00 Proceedings of the 33rd Hawaii International Conference on System Sciences-Volume 8 - Volume 8
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Since sensor nodes are generally constrained in on-board energy supply, saving energy is crucial in extending the lifetime of the wireless sensor networks. In this paper, we present a dynamic threshold scheme used in the data propagation phase of Directed Diffusion, which can decrease the traffic between nodes and therefore prolongs the longevity of wireless sensor networks. The sensor node sends data to the sink only when the sampling value reaches the hard threshold and the difference between the current sample value and the last sent value is greater than the soft threshold, which reduces data traffic to conserve energy. The soft threshold will be adjusted by using the historical values to make the proportion of sending due to timeout equal to the expected value. Whether the values of a sensed attribute change drastically or not, the data sent will continue at a reasonable rate, which adapts the sensor network to the changeful circumstance. Simulation results show that the improved Directed Diffusion based on dynamic threshold can prolong the network lifetime about 35% compared with the original system and can reacting immediately to drastic change in the values of a sensed attribute.