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OPNET Technologies © 2008 OPNET Technologies, Inc. |
University: University
College Cork Project 1: Implementation and Evaluation of High Speed TCP
Variants in OPNET
In recent years, bandwidth of the
Internet has been increased significantly. Especially, with the emerging long-reach
passive optical network [1][2][3], the last-mile problem will be solved, high
speed Internet access can be provided from end to end, and BDP experienced by
a TCP connection becomes huge. Based on these observations, many high speed
TCP variants have been proposed, such as Cubic TCP [4], H-TCP [5], Fast TCP
[6], and Compound TCP [7]. While many of these proposals remain only as
research prototypes, a small number of them have been gradually and steadily
deployed on some widely available operating systems. In particular, Compound
TCP is distributed with computers running on Windows Server 2008, Windows
Vista and Windows 7. Cubic TCP has become the default configuration for
Fedora 9, Ubuntu 8.10, and their later
distributions. When studying the next generation
optical access network, simulation is normally used since the real network is
till unavailable. To study the performance observed by the user (or
applications), these high speed TCP variants need to be considered. However,
as the simulator well recognized by the academic and industry societies,
OPNET does not support models of these high speed TCP variants. In this
project, we will implement some influential high speed TCP variants in OPNET,
such as Cubic TCP and Compound TCP. We will implement them based on the OPNET
framework and validate the correctness of these models. These models also
provide a solid basis to study the performance of the future high speed
Internet with OPNET, not only long reach PON, but also some high speed wireless
networks (e.g., 802.11n and WiMax). Project 2: Long Reach PON Simulation in OPNET
The advances in optical
communication have increased the bandwidth of the Internet significantly.
Optical fibers of core networks provide bandwidth measured in Tbps (1000 Gbps). For example,
expected capacity of the forthcoming Trans-Pacific Express is 5.12 Tbps. More importantly, FTTx
(Fiber To The Home, Building, etc.) has also been widely deployed in some
countries (Japan, Korea, etc.) to solve the last mile problem and provide
high speed Internet access. Passive optical networks are normally adopted by
these FTTx deployment due to its low cost. In
recent years, long reach PON has been proposed to provide higher bandwidth
with lower cost [1]. To study the promising long-reach
passive optical network, simulation is one very important method since LR-PON
products are still under research & development. In this project, OPNET
is selected as the simulator since it is well recognized by the academic and
industry societies. We will first implement the model for 10G-EPON [2].
10G-GPON will also be considered in the future [3]. With these models, we can
study long-reach PON from various aspects, such as dynamic bandwidth
allocation in MAC layer, congestion control in transport layers, and network
parameter tuning for providing better performance to the users. Reference
[1] H. Song, B.W. Kim, and B. Mukherjee, Long-Reach Optical Access Networks: A Survey
of Research Challenges, Demonstrations, and Bandwidth Assignment Mechanisms,
IEEE COMMUNICATIONS SURVEYS & TUTORIALS, 2010, Vol. 12, pp. 112-123 OPNET
Technologies Inc.
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