10-04-2017, 08:51 PM
opnet pon pdf
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 , 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, H-TCP, Fast TCP , and Compound TCP . 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.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. 10G-GPON will also be considered in the future . 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.