Medium Access Control for Opportunistic Concurrent Transmissions under Shadowing Channels

Sensors

In Keun Son¹  Shiwen Mao¹ 

[1] Department of Electrical and Computer Engineering, Auburn University, Auburn, AL 36849, USA; E-Mail:

关键词: exposed terminal;    IEEE 802.11 MAC;    Log-normal shadowing;    media access control;    multi-hop wireless networks;   

DOI  :  10.3390/s90604824

来源: mdpi

【 摘 要 】

We study the problem of how to alleviate the exposed terminal effect in multi-hop 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 sched-ules 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 multi-hop wireless networks.

【 授权许可】

CC BY   
© 2009 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.