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Sensors 2016, 16(6), 815;

Segmentized Clear Channel Assessment for IEEE 802.15.4 Networks

School of Electrical and Electronics Engineering, Chung-Ang University, Seoul 06974, Korea
Seoul SW-SoC R&BD Center, ETRI, Gyeong-gi 13480, Korea
Author to whom correspondence should be addressed.
Academic Editor: Leonhard M. Reindl
Received: 21 January 2016 / Revised: 23 May 2016 / Accepted: 27 May 2016 / Published: 3 June 2016
(This article belongs to the Section Sensor Networks)
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This paper proposed segmentized clear channel assessment (CCA) which increases the performance of IEEE 802.15.4 networks by improving carrier sense multiple access with collision avoidance (CSMA/CA). Improving CSMA/CA is important because the low-power consumption feature and throughput performance of IEEE 802.15.4 are greatly affected by CSMA/CA behavior. To improve the performance of CSMA/CA, this paper focused on increasing the chance to transmit a packet by assessing precise channel status. The previous method used in CCA, which is employed by CSMA/CA, assesses the channel by measuring the energy level of the channel. However, this method shows limited channel assessing behavior, which comes from simple threshold dependent channel busy evaluation. The proposed method solves this limited channel decision problem by dividing CCA into two groups. Two groups of CCA compare their energy levels to get precise channel status. To evaluate the performance of the segmentized CCA method, a Markov chain model has been developed. The validation of analytic results is confirmed by comparing them with simulation results. Additionally, simulation results show the proposed method is improving a maximum 8.76% of throughput and decreasing a maximum 3.9% of the average number of CCAs per packet transmission than the IEEE 802.15.4 CCA method. View Full-Text
Keywords: clear channel assessment; carrier sense multiple access with collision avoidance (CSMA/CA); IEEE 802.15.4 clear channel assessment; carrier sense multiple access with collision avoidance (CSMA/CA); IEEE 802.15.4

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Son, K.J.; Hong, S.H.; Moon, S.-P.; Chang, T.G.; Cho, H. Segmentized Clear Channel Assessment for IEEE 802.15.4 Networks. Sensors 2016, 16, 815.

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