Study on Additional Carrier Sensing for IEEE 802.15.4 Wireless Sensor Networks

Sensors

Bih-Hwang Lee²  Ruei-Lung Lai²  Huai-Kuei Wu¹ 

[1]Department of Information Networking and System Administration, Ling Tung University, 1 Ling tung Rd., Taichung 408, Taiwan

[2] E-Mail:

[3]Department of Electrical Engineering, National Taiwan University of Science and Technology, 43 Keelung Rd., Section 4, Taipei 106, Taiwan

[4] E-Mails:

关键词: wireless sensor network;    IEEE 802.15.4;    carrier sense multiple access with collision avoidance (CSMA/CA);    medium access control (MAC);   

DOI  :  10.3390/s100706275

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
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