NDLI: A novel physical carrier sensing scheme for enhancing spatial reuse in multihop wireless networks

Content Provider	IEEE Xplore Digital Library
Author	Yongning Zhang Alawieh, B. Assi, C.
Copyright Year	2008
Description	Author affiliation: Electr. & Comput. Eng. Dept., Concordia Univ., Montreal, QC (Yongning Zhang; Alawieh, B.; Assi, C.)
Abstract	Recently, tuning the physical carrier sensing threshold $(CS_{th})$ has been proposed as an efficient mechanism to enhance the network throughput in an IEEE 802.11-based multihop ad hoc networks. The physical carrier sensing method reduces the likelihood of collision by preventing nodes in the vicinity of each other from transmitting simultaneously, while allowing nodes that are separated by a safe margin to engage in concurrent transmission. In this paper, we propose a distributed adaptive scheme through which nodes dynamically adjust their $CS_{th}$ to eliminate the likelihood of collisions from hidden terminals and in turn enhances spatial reuse by reducing the number of exposed terminals. Specifically, a node adjusts its $CS_{th}$ based on both its success/ failure history attempts and the information it receives from neighboring nodes through CTS packets. Moreover, to reduce the effect of exposed terminals, the proposed scheme employs the RTS/CTS exchange only for the purpose of informing neighboring nodes of their $CS_{th}$ but not to silence them. The proposed scheme adaptively performs a dynamic switch between the RTS/CTS access scheme and the basic scheme based on a predefined policy in order to avoid the additional overhead caused by the RTS/CTS exchange. Simulations results have demonstrated the significant throughput gains that can be achieved by the proposed scheme, compared with other methods in recent literature.
Starting Page	1
Ending Page	9
File Size	193543
Page Count	9
File Format	PDF
ISBN	9781424420995
DOI	10.1109/WOWMOM.2008.4594852
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-06-23
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transmitters Heuristic algorithms Interference Receivers Throughput Sensors Tuning
Content Type	Text
Resource Type	Article

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