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Sensors 2010, 10(7), 6275-6289; doi:10.3390/s100706275

Study on Additional Carrier Sensing for IEEE 802.15.4 Wireless Sensor Networks

1
Department of Electrical Engineering, National Taiwan University of Science and Technology, 43 Keelung Rd., Section 4, Taipei 106, Taiwan
2
Department of Information Networking and System Administration, Ling Tung University, 1 Ling tung Rd., Taichung 408, Taiwan
*
Author to whom correspondence should be addressed.
Received: 30 March 2010 / Revised: 10 May 2010 / Accepted: 14 May 2010 / Published: 24 June 2010
(This article belongs to the Section Chemical Sensors)
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Abstract

Wireless sensor networks based on the IEEE 802.15.4 standard are able to achieve low-power transmissions in the guise of low-rate and short-distance wireless personal area networks (WPANs). The slotted carrier sense multiple access with collision avoidance (CSMA/CA) is used for contention mechanism. Sensor nodes perform a backoff process as soon as the clear channel assessment (CCA) detects a busy channel. In doing so they may neglect the implicit information of the failed CCA detection and further cause the redundant sensing. The blind backoff process in the slotted CSMA/CA will cause lower channel utilization. This paper proposes an additional carrier sensing (ACS) algorithm based on IEEE 802.15.4 to enhance the carrier sensing mechanism for the original slotted CSMA/CA. An analytical Markov chain model is developed to evaluate the performance of the ACS algorithm. Both analytical and simulation results show that the proposed algorithm performs better than IEEE 802.15.4, which in turn significantly improves throughput, average medium access control (MAC) delay and power consumption of CCA detection. View Full-Text
Keywords: wireless sensor network; IEEE 802.15.4; carrier sense multiple access with collision avoidance (CSMA/CA); medium access control (MAC) wireless sensor network; IEEE 802.15.4; carrier sense multiple access with collision avoidance (CSMA/CA); medium access control (MAC)
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Lee, B.-H.; Lai, R.-L.; Wu, H.-K.; Wong, C.-M. Study on Additional Carrier Sensing for IEEE 802.15.4 Wireless Sensor Networks. Sensors 2010, 10, 6275-6289.

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