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Journal of Information Science and Engineering, Vol. 25 No. 4, pp. 1103-1119 (July 2009)

Hybrid Congestion Control Protocol in Wireless Sensor Networks*

1Department of Computer Science
National Tsing Hua University
Hsinchu, 300 Taiwan
2Department of Computer Science and Information Engineering
National Central University
Chungli, 320 Taiwan

In wireless sensor networks, congestion occurs when the traffic load being offered exceeds the available capacity of sensor nodes. In most applications, every sensor node will send the event it has sensed to a sink node. This operation makes the sensors closer to the sink, resulting in congestion. Congestion may cause packets loss, lower network throughput and sensor energy waste. To address this challenge, there is a proposal for a distributed algorithm that mitigates congestion and allocates appropriate source rate to a sink node for sensor networks. The proposed algorithm is a hybrid congestion control protocol that considers not only the packets delivery rate but also retains the buffer size of each node. The proposed protocol may avoid packets drop due to traffic congestion and improve the network throughput. The simulation results show that the performance of the proposed protocol is better than the previous works.

Keywords: buffer management, congestion control, flow control, wireless sensor networks, rate adjustment

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Received September 4, 2007; revised April 9, 2008; accepted May 2, 2008.
Communicated by Ten-Hwang Lai.
* This paper was partially supported by the National Science Council of Taiwan, R.O.C. under grant No. NSC 96-2221-E-007-174.