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Enhanced CCA Scheme for Slotted CSMA/CA in IEEE 802.15.4 LR-WPANs

Saeyoung AHN, Wook KIM, Sunshin AN

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Summary :

Recently, IEEE 802.15.4 has been standardized for WSNs (Wireless Sensor Networks). This paper proposes an enhanced CCA scheme which involves the data transmission device sending a notifyBusyChannel (nBC) signal in the backoff period when the Channel Using Quotient (CUQ) exceeds 0.5. The CUQ stands for the rate of channel utilization in the previous slot duration. In a single CCA operation, the device nodes are made aware of the busy status of the channel by the nBC signal. We implement the ECCA scheme in a hardware chip for a performance evaluation. The results show that the proposed scheme has short queuing times and less energy consumption than IEEE 802.15.4 CCA. And the scheme is compatible with conventional IEEE 802.15.4 devices.

Publication
IEICE TRANSACTIONS on Communications Vol.E94-B No.4 pp.1072-1075
Publication Date
2011/04/01
Publicized
Online ISSN
1745-1345
DOI
10.1587/transcom.E94.B.1072
Type of Manuscript
LETTER
Category
Network

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