The current Internet design is not capable to support communications in environments characterized by very long delays and frequent network partitions. To allow devices to communicate in such environments, delay-tolerant networking solutions have been proposed by exploiting opportunistic message forwarding, with limited expectations of end-to-end connectivity and node resources. Such solutions ...

The lack of contemporaneous end-to-end paths often characterize mobile computing environments, for which Delay Tolerant Networking is designed. In this work, we present a novel routing protocol using Virtual Repositories to assist in location-based forwarding when the location of a destination node is unknown. We compare the protocol to other existing protocols under two mobility models, Random...

The Internet is built around the assumption of contemporaneous end-to-end connectivity. This is at odds with what typically happens in mobile networking, where mobile devices move between islands of connectivity, having opportunity to transmit packets through their wireless interface or simply carrying the data toward a connectivity island. We propose Pocket Switched Networking, a communication...

We propose a novel active queue management scheme tailored to the specific characteristics of third generation (3G) cellular networks. Such links are often the bottleneck for an endto-end connection and dedicated to one host. Taking advantage of these specific characteristics, we developed a queuing scheme that is simpler than popular Random Early Detection (RED) schemes. Despite its simplicity...

IP networks are destined to become the ubiquitous global communication infrastructure. With the introduction of Service Level Agreements(SLAs), the importance of being able to accurately know and manipulate traffic behaviour in a network has increased. Inferring the delay distributions is of great importance for various network applications. In this paper, we adopt an active measurement techniq...

In delay tolerant networks (DTNs), the network may not be fully connected at any instant of time, but connections occurring between nodes at different times make the network connected through the entire time continuum. In such a case, traditional routing methods fail to operate because there are no contemporaneous end-to-end paths between sources and destinations. This study examines the routin...

This paper investigates congestion control in opportunistic networks that use delay-tolerant networking (DTN) as a basis for communication. We propose a mechanism that advertises buffer occupancy information to adjacent nodes and avoids forwarding through nodes with high buffer occupancy. The nodes then achieve global congestion avoidance simply based on locally available information. The propo...

With recent advances in wireless communication, networking, and low power sensor technology, wireless sensor network (WSN) systems have begun to take significant roles in various applications ranging from environmental sensing to mobile healthcare sensing. While some WSN applications only require a limited amount of bandwidth, new emerging applications operate with a noticeably large amount of ...

In this paper, we propose an analytical model for TCP over selective repeat ARQ in wireless networks, in which random loss is the primary impediment to reliable, high-speed data services. We focus on the issue of modeling RTT (round trip time) variation due to ARQ retransmission at the link layer with non-negligible propagation delay. With the proposed model, we present upper and lower bounds f...

The rapid advances in sensors and ultra-low power wireless communication has enabled a new generation of wireless sensor networks: Wireless Body Area Networks (WBAN). To the best of our knowledge the current paper is the first to address broadcast in WBAN. We first analyze several broadcast strategies inspired from the area of Delay Tolerant Networks (DTN). The proposed strategies are evaluated...