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— Wireless ad hoc networks are typically assumed to be equipped with omnidirectional antennas. With advances in signal processing and antenna technology, it may now be possible to incorporate sophisticated antennas into portable devices, and thereby exploit the benefits of beamforming at the MAC, network, and transport layer. Recent networking research has(More)
Estimating the throughput of an WiFi connection can be quite complex, even when considering simplified scenarios. Indeed, the varying number of parameters specified in the standards makes it hard to understand their impact in terms of delay and throughput. The main contribution of this work is to present a simple scheme to compute the exact maximum(More)
The main contribution of this work is to propose a distributed and collaborative cache solution in which the decisions to cache objects are performed in a collaborative way. In our solution, objects are classified in private and shared objects. Private objects are managed as in an individual cache system whereas the management of shared objects are(More)
Reading the contents of Web page with a small-screen device, such as a PDA or cell-phone, is still far from being a pleasant experience. Owing to the device limitations, current mobile browsers cannot handle all HTML tags, such as tables, for instance. Thus, most mobile browsers provide a linearized version of the source HTML page, leading to a large amount(More)
The main contribution of this work is to propose energy-eecient randomized initialization protocols for ad-hoc radio networks (ARN, for short). First, we show that if the number n of stations is known beforehand, the single-channel ARN can be initialized by a protocol that terminates, with high probability, in O(n) time slots with no station being awake for(More)