University of Illinois Urbana-Champaign

CA-AQM: Channel-Aware Active Queue Management for Wireless Networks

Xue, Yuan; Nguyen, Hoang; Nahrstedt, Klara

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CA-AQM Channel-Aware Active Queue Management for Wireless Networks.pdf

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https://hdl.handle.net/2142/11271

Description

Title
CA-AQM: Channel-Aware Active Queue Management for Wireless Networks
Author(s)
  • Xue, Yuan
  • Nguyen, Hoang
  • Nahrstedt, Klara
Issue Date
2006-10
Keyword(s)
wireless networks
Date of Ingest
2009-04-21T19:16:20Z
Abstract
In a wireless network, data transmission suffers from varied signal strengths and channel bit error rates. To ensure successful packet reception under different channel conditions, automatic bit rate control schemes are implemented to adjust the transmission bit rates based on the perceived channel conditions. This leads to a wireless network with diverse bit rates. On the other hand, TCP is unaware of such {\em rate diversity} when it performs flow rate control in wireless networks. Experiments show that the throughput of flows in a wireless network are driven by the one with the lowest bit rate, (i.e., the one with the worst channel condition). This does not only lead to low channel utilization, but also fluctuated performance for all flows independent of their individual channel conditions. To address this problem, we conduct an optimization-based analytical study of such behavior of TCP. Based on this optimization framework, we present a joint flow control and active queue management solution. The presented channel-aware active queue management (CA-AQM) provides congestion signals for flow control not only based on the queue length but also the channel condition and the transmission bit rate. Theoretical analysis shows that our solution isolates the performance of individual flows with diverse bit rates. Further, it stabilizes the queue lengths and provides a time-fair channel allocation. Test-bed experiments validate our theoretical claims over a multi-rate wireless network testbed.
Type of Resource
text
Genre of Resource
Technical Report
Permalink
http://hdl.handle.net/2142/11271
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