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OPNET Technologies © 2008 OPNET
Technologies, Inc. |
University: University of
California, Santa Barbara The objective of our project is to introduce a new enhanced architecture of challenged networks that is based on the assumption that other networks with different characteristics exist in parallel. In previous research, the main trend in providing routing functions or transport services has been mainly through finding various techniques over the challenged network itself. Our project, however, exploits the availability of parallel networks to better serve challenged networks. We present a generalized architecture that formulates our vision and opens new areas of research in the direction of ParaNets. The main goal behind our evaluation in this project is to study the impact of the availability of parallel networks on the services and basic functionalities that can be provided to challenged networks. Publications: Khaled A. Harras, Mike P. Wittie, Kevin C. Almeroth, Elizabeth M. Belding, "Paranets: A parallel network architecture for challenged networks," in IEEE Workshop on Mobile Computing Systems and Applications (HotMobile), 2007. Delay Tolerant Network (DTN) routing addresses challenges of providing end-to-end service where end-to-end data forwarding paths may not exist. The performance of current DTN routing protocols is often limited by routing metric "staleness", i.e., routing information that becomes out-of-date or inaccurate because of long propagation delays. Our previous work, ParaNets, proposed a new opportunistic network architecture in which the data channel is augmented by a thin end-to-end "control" channel. The control channel is adequate for the exchange of control traffic, but not data. In work we aim to investigate Cloud Routing, a routing solution for the ParaNets architecture. We motivate the need for such a solution, not only because of stale routing metrics, but also because of congestion that can occur in DTNs. Unable to use up-to-date routing metrics to limit congestion, existing DTN routing solutions suffer from low goodput and long data delivery delays. We aim to investigate how Cloud Routing avoids congestion by smart use of forwarding opportunities based on up-to-date routing metrics. Publications: Mike P. Wittie, Khaled A. Harras, Kevin C. Almeroth, Elizabeth M. Belding, "On The Implications of Routing Metric Staleness in Delay Tolerant Networks," in Computer Communications, 2009. Mike P. Wittie, Kevin C. Almeroth, Elizabeth M. Belding, Ivica Rimac, Volker Hilt "Internet Service in Developing Regions Through Network Coding," in IEEE Communications Society Conference on Sensor, Mesh and Ad Hoc Communications and Networks (SECON), 2009. 3. Wireless Gateway Selection: To cope with unpredictable packet losses caused by the wireless environment there exist techniques using route selection, retransmission, and buffering. This can make losses incurred over a one or two hop path acceptable. However, as the number of hops in the path increases to three, four, and beyond packet losses inexorably add up and exceed the limits of these techniques. This can cause unacceptable interruptions in content delivery and make it impossible to meet service level agreements. In a wireless cloud with multiple entry points an incorrect entry point selection can result in unecessary additional hops causing unacceptable interruption of service. Addressing this problem in this work we present an anycast entry point selection technique that minimizes hop count in a wireless cloud through intelligent selection of entry points into the cloud. OPNET Technologies, Inc. is a leading provider of solutions for managing networks and applications. OPNET's best-in-class solutions address application troubleshooting, application monitoring, network monitoring, network configuration management, capacity management, and network simulation. OPNET’s solutions have been operationally proven in thousands of customer environments worldwide, including corporate and government enterprises, government and defense agencies, network service providers, and network equipment manufacturers. For more information about OPNET and its products, visit www.opnet.com. |
