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WiFi-based Long Distance (WiLD) networks with links as long as 50–100 km have the potential to provide con-nectivity at substantially lower costs than traditional approaches. However, real-world deployments of such networks yield very poor end-to-end performance. First, the current 802.11 MAC protocol has fundamental shortcomings when used over long(More)
We present the design and evaluation of two forms of power management schemes that reduce the energy consumption of networks. The first is based on putting network components to sleep during idle times, reducing energy consumed in the absence of packets. The second is based on adapting the rate of network operation to the offered workload, reducing the(More)
Despite the increasing number of WiFi-based Long Distance (WiLD) network deployments, there is a lack of understanding of how WiLD networks perform in practice. In this paper, we perform a systematic study to investigate the commonly cited sources of packet loss induced by the wireless channel and by the 802.11 MAC protocol. The channel induced losses that(More)
Very few computer systems that have ever been deployed in rural areas in developing regions have been operational and sustainable in the long term — most such systems have not gone beyond the pilot phase. This paper describes our experiences in deploying and maintaining two rural WiFi-based long-distance networks over the last three years: (a) the Aravind(More)
We consider the problem of efficientMAC design for long-distance WiFi-based mesh networks. In such networks it is common to find long propagation delays, the use of directional antennas, and the presence of inter-link interference. Prior work has shown that these characteristics make traditional CSMA-based MACs a poor choice for long-distance mesh networks(More)
Modeling and tracking the driving environment is a complex problem due to the heterogeneous nature of the real world. In many situations, modeling the obstacles and the driving surfaces can be achieved by the use of geometrical objects, and tracking becomes the problem of estimating the parameters of these objects. In the more complex cases, the scene can(More)
Networked end-systems such as desktops and set-top boxes are often left powered-on, but idle, leading to wasted energy consumption. An alternative would be for these idle systems to enter low-power sleep modes. Unfortunately , today, a sleeping system sees degraded func-tionality: first, a sleeping device loses its network " presence " which is problematic(More)
Software routers can lead us from a network of special-purpose hardware routers to one of general-purpose extensible infrastructure - if, that is, they can scale to high speeds. We identify the challenges in achieving this scalability and propose a solution: a cluster-based router architecture that uses an interconnect of commodity server platforms to build(More)
Alongside good governance, technology is considered among the greatest enablers for improved quality of life. However, the majority of its benefits have been concentrated in industrialized nations and therefore limited to a fraction of the world's population. We believe that technology has a large role to play in developing regions, that "First World"(More)