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The phenomenal growth in popularity of the World Wide Web (WWW, or the Web) has made WWW traffic the largest contributor to packet and byte traffic on the NSFNET backbone. This growth has triggered recent research aimed at reducing the volume of network traffic produced by Web clients and servers, by using caching, and reducing the latency for WWW users, by(More)
Thii paper describes a new protocol to support IP multicast for mobile hosts in an IP internetwork. It uses the basic uni-cast routing capability of IETF Mobile IP as a foundation, and leverages existing IP multicast to provide multicast services for mobile hosts as well. We believe that the resulting scheme is simple, scalable, transparent, and to the(More)
This paper develops analytic models that characterize the behavior of on-demand stored media content delivery using BitTorrent-like protocols. The models capture the effects of different piece selection policies, including Rarest-First and two variants of In-Order. Our models provide insight into transient and steady-state system behavior, and help explain(More)
This article studies the "filter effects" that occur in Web proxy caching hierarchies due to the presence of multiple levels of caches. That is, the presence of one level of cache changes the structural characteristics of the workload presented to the next level of cache, since only the requests that miss in one cache are forwarded to the next(More)
Abslrucf-This paper presents a workload characterization study for Internet Web servers. Six diRerent data sets are used in the study: three From academic environments, two from scientific research organizations, and one from a commercial Internet provider. These data sets represent three different orders of magnitude in server activity, and two different(More)
We introduce the concept of a Visual Backchannel as a novel way of following and exploring online conversations about large-scale events. Microblogging communities, such as Twitter, are increasingly used as digital backchannels for timely exchange of brief comments and impressions during political speeches, sport competitions, natural disasters, and other(More)
This paper develops a simple and accurate stochastic model for the steady-state throughput of a TCP NewReno bulk data transfer as a function of round-trip time and loss behavior. Our model builds upon extensive prior work on TCP Reno throughput models but differs from these prior works in three key aspects. First, our model introduces an analytical(More)
Wireless Local Area Networks (WLANs) based on the IEEE 802.11 technology have become increasingly popular and ubiquitous. The 802.11 standard allows each station in a WLAN equal opportunity to access the wireless channel, which can result in unfair sharing of network bandwidth between upstream and downstream TCP flows at an AP. In this paper, we propose two(More)
This article presents an overview of the most significant changes in wireless data traffic and its main driving forces throughout the past decade (1998-2008). The main axes of change are discussed: wireless technology, user population, and applications. Evolution of wireless technology realized a 200-fold increase in data rate, and facilitated a continuous(More)