Performance modeling and analysis of the interplay among Tcp, active queue management and wireless link adaptation
Author(s)
Advisor
Akar, NailDate
2015-09Publisher
Bilkent University
Language
English
Type
ThesisItem Usage Stats
221
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Abstract
We propose a novel workload-dependent queuing model of a wireless router link
which employs active queue management and is offered with a number of persistent
TCP flows. As opposed to existing work that focus only on the average
queue occupancy as the performance metric of interest, the proposed analytical
method obtains the more informative steady-state queue occupancy distribution
of the wireless link. With the intention of maximizing TCP throughput, this
analytical method is used to study traffic agnostic link adaptation schemes with
and without hybrid ARQ.
Moreover, a novel cross-layer queue-aware link adaptation scheme is proposed
to improve the TCP throughput relative to the case where adaptive modulation
and coding decisions are made based solely on the physical layer parameters. A
fixed-point analytical model is proposed to obtain the aggregate TCP throughput
attained at wireless links employing active queue management and queue-aware
link adaptation. Allowing packet retransmissions and generalizing the scope from
a single link to a network of such links, we propose an energy efficient queue-aware
link adaptation scheme with hybrid ARQ which jointly adapts the transmission
power and rate of the wireless links based on the queue occupancy levels and the
channel conditions. Furthermore, we provide a fixed-point analytical method for
such networks.
Keywords
Link adaptationAdaptive modulation and coding
Wireless networks
TCP
Cross-layer queuing analysis
Queue awareness
Active queue management