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Message Ferries as Generalized Dominating Sets in Intermittently Connected Mobile Networks

Ammar, Mostafa H.; Polat, Bahadir K.; Sachdeva, Pushkar; Zegura, Ellen W. (Georgia Institute of Technology, 2009)

Message ferrying is a technique for routing data in wireless and mobile networks in which one or more mobile nodes are tasked with storing and carrying data between sources and destinations. To achieve connectivity between ...

Application-Layer Anycasting

Bhattacharjee, Samrat; Ammar, Mostafa H. (Mostafa Hamed); Zegura, Ellen W.; Shah, Viren; Fei, Zongming (Georgia Institute of Technology, 1996)

Server replication is a key approach for maintaining user-perceived quality of service within a geographically wide-spread network. The anycasting communication paradigm is designed to support server replication by ...

Distributed Laboratories: A Research Proposal

Fujimoto, Richard M.; Schwan, Karsten; Ahamad, Mustaque; Hudson, Scott E.; Limb, J. O. (John O.); Ammar, Mostafa H. (Mostafa Hamed); Ezquerra, Norberto F.; Mukherjee, Amarnath; Potts, Colin; Ramachandran, Umakishore; Zegura, Ellen W. (Georgia Institute of Technology, 1996)

The continuing merger of computer and communication technologies is leading to a new computing/communications infrastructure of unprecedented magnitude, enabling new applications with broad economic and social impact. Yet, ...

Core Selection Methods for Multicast Routing

Calvert, Kenneth L.; Zegura, Ellen W.; Donahoo, Michael J. (Georgia Institute of Technology, 1995)

Multicast routing is an important topic of both theoretical and practical interest. Some recently-proposed multicast routing algorithms involve the designation of one or more network nodes as the "center" of the routing ...

Trading Latency for Energy in Wireless Ad Hoc Networks using Message Ferrying

Jun, Hyewon; Zhao, Wenrui; Ammar, Mostafa H. (Mostafa Hamed); Zegura, Ellen W.; Lee, Chungki (Georgia Institute of Technology, 2004)

Power management is a critical issue in wireless ad hoc networks where the energy supply is limited. In this paper, we investigate a routing paradigm, Message Ferrying (MF), to save energy while trading off data delivery ...

Capacity Enhancement Using Throw-Boxes in Mobile Delay Tolerant Networks

Zhao, Wenrui; Chen, Yang; Ammar, Mostafa H. (Mostafa Hamed); Corner, Mark D.; Levine, Brian; Zegura, Ellen W. (Georgia Institute of Technology, 2006)

Delay tolerant networks (DTNs) are a class of emerging networks that are subject to frequent and long-duration partitions. Due to intermittent connectivity, DTNs might be significantly limited in supporting application ...

Selecting Among Replicated Adaptive Multicast Servers

Fei, Zongming; Ammar, Mostafa H. (Mostafa Hamed); Zegura, Ellen W. (Georgia Institute of Technology, 2000)

Server replication and multicasting are well-established techniques for increasing capacity of a networked service and improving client performance. In this paper, we consider the combination of these two techniques. ...

Adding structure to unstructured peer-to-peer networks: the role of overlay topology

Merugu, Shashidhar; Srinivasan, Sridhar; Zegura, Ellen W. (Georgia Institute of Technology, 2003)

Our work examines the role of overlay topology on the performance of unstructured peer-to-peer systems. We focus on two metrics of performance: (a) search protocol performance, a local gain perceived directly by a user ...

Collaborative Research: NeTS-NBD: Construction of robust and efficient disruption tolerant networks

Zegura, Ellen; Ammar, Mostafa; Clark, Russ (Georgia Institute of Technology, 2010-11-14)

The Energy-Limited Capacity of Wireless Networks

Zhao, Wenrui; Ammar, Mostafa H. (Mostafa Hamed); Zegura, Ellen W. (Georgia Institute of Technology, 2004)

The performance of large-scale wireless ad hoc networks is often limited by the broadcasting nature of the wireless medium and the inherent node energy constraints. While the impact of the former on network capacity has ...