Implications of Power Control in Wireless Networks: A Quantitative Study Ioannis Broustis, Jakob Eriksson, Srikanth V. Krishnamurthy, Michalis Faloutsos Department of Computer Science and Engineering University of California, Riverside {broustis, jeriksson, krish, michalis}@cs.ucr.edu PAM 2007
14
Embed
Implications of Power Control in Wireless Networks: A Quantitative Study Ioannis Broustis, Jakob Eriksson, Srikanth V. Krishnamurthy, Michalis Faloutsos.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Implications of Power Control in Wireless Networks: A Quantitative Study
Ioannis Broustis, Jakob Eriksson, Srikanth V. Krishnamurthy, Michalis FaloutsosDepartment of Computer Science and Engineering
University of California, Riverside{broustis, jeriksson, krish, michalis}@cs.ucr.edu
PAM 2007
The problem
Increasing the transmission power may:• Increase throughput, due to increased signal quality• Increase interference levels in neighboring links
Conflict in providing the best network-wide throughput• Need to identify the possible interference scenarios • For these scenarios, need to examine:
Whether power control can help alleviate interference Whether fairness is affected by power control Whether the traditional Virtual Carrier Sensing (RTS/CTS exchange) can
co-exist with power control
In this work…
We conduct a set of experiments on an indoor wireless testbed• We focus on the interference between pairs of links
We identify 3 interference scenarios:• Overlapping
Neither power control nor RTS can improve performance
• Hidden-terminal Power control essential for fairness RTS with power control degrades performance!
• Potentially disjoint Power control increases performance significantly RTS with power control, however, results in lower throughput here as well
Experimental set-up
Indoor wireless testbed• Nodes: 15 Soekris net4826 • Wireless: EMP-8602-6G Atheros AR5006• MadWifi driver• Linux kernel v2.6, mounted over NFS• 802.11a for avoiding external interference
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Methodology
In our experiments we activate two links at a time• We observe the achieved throughput by each of the two links, for