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With the popularity of services like Push-to-Talk, the need for “always on” services is becoming important for service providers. This paper addresses the problem of supporting always on services in existing and new network architectures. It defines the requirements of always on services, identifies the problems in supporting such services, and proposes an overlay network based solution to make always...
We show how a disruptive force in mobile computing can be created by extending today’s unmodified cloud to a second level consisting of self-managed data centers with no hard state called cloudlets. These are located at the edge of the Internet, just one wireless hop away from associated mobile devices. By leveraging lowlatency offload, cloudlets enable a new class of real-time cognitive assistive...
The rapid growth in multimedia traffic is straining mobile networks thus necessitating the need for efficient content delivery mechanisms. In this paper we present the design and analysis of a scheme for streaming non-live, pre-recorded content (e.g. Video on Demand) that opportunistically takes advantage of the “slow fading” variations in the wireless link quality. The proposed scheme works by selectively...
YouTube is the world's largest user-generated video sharing service. Estimates suggest that this six-year-old service hosts several million user-generated video clips, receives more than three billion views per day, and has approximately 48 hours of content uploaded every minute. According to some measurements, YouTube accounts for between 25–30% of the Internet traffic, and it is anticipated that...
Verifying a communication protocol means ensuring that it is free of logical errors prior to implementing it. That is, the goal of verification is to guarantee that the protocol does exactly what the designer intended. Techniques for verifying protocols differ depending on the protocol modeling techniques used. All techniques begin by modeling the protocol as a collection of processes. Each process...
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