Sensors 2009, 9(6), 4824-4844; doi:10.3390/s90604824
Article

Medium Access Control for Opportunistic Concurrent Transmissions under Shadowing Channels

1 Department of Electrical and Computer Engineering, Auburn University, Auburn, AL 36849, USA 2 Center for u-Manufacturing, Pohang University of Science and Technology, Pohang, Korea
* Author to whom correspondence should be addressed.
Received: 12 June 2009; in revised form: 16 June 2009 / Accepted: 17 June 2009 / Published: 18 June 2009
(This article belongs to the Special Issue Wireless Sensor Technologies and Applications)
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Abstract: We study the problem of how to alleviate the exposed terminal effect in multihop wireless networks in the presence of log-normal shadowing channels. Assuming node location information, we propose an extension of the IEEE 802.11 MAC protocol that schedules concurrent transmissions in the presence of log-normal shadowing, thus mitigating the exposed terminal problem and improving network throughput and delay performance. We observe considerable improvements in throughput and delay achieved over the IEEE 802.11 MAC under various network topologies and channel conditions in ns-2 simulations, which justify the importance of considering channel randomness in MAC protocol design for multihop wireless networks.
Keywords: exposed terminal; IEEE 802.11 MAC; Log-normal shadowing; media access control; multi-hop wireless networks

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MDPI and ACS Style

Son, I.K.; Mao, S.; Hur, S.M. Medium Access Control for Opportunistic Concurrent Transmissions under Shadowing Channels. Sensors 2009, 9, 4824-4844.

AMA Style

Son IK, Mao S, Hur SM. Medium Access Control for Opportunistic Concurrent Transmissions under Shadowing Channels. Sensors. 2009; 9(6):4824-4844.

Chicago/Turabian Style

Son, In Keun; Mao, Shiwen; Hur, Seung Min. 2009. "Medium Access Control for Opportunistic Concurrent Transmissions under Shadowing Channels." Sensors 9, no. 6: 4824-4844.

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