Modeling and Optimization of Medium Access in CSMA Wireless Networks With Topology Asymmetry

Recently, the Carrier Sense Multiple Access (CSMA) based protocol IEEE 802.11 Distributed Coordination Function (DCF) has been widely used for medium access control in non-single-cell wireless networks (e.g., multi-hop networks or multi-AP dense WLANs). However, since IEEE 802.11 DCF was originally designed for single-cell WLANs, the use of the protocol in non-single-cell wireless networks often produces severe unfairness among competing flows and even complete flow starvation. Recent studies have revealed that the fundamental cause of the unfairness is the ineffective medium access coordination problem under DCF due to topology asymmetry in non-single-cell networks.

Provided by: Institute of Electrical and Electronics Engineers Topic: Mobility Date Added: Aug 2011 Format: PDF

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