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Network virtualization has been extensively researched in the last years as a key enabler for improving the network performance. However, virtualization in wireless networks pose some unique challenges: first, the usual over-provisioning approach for providing isolation between multiple virtual entities is not viable; second, the partitioning criteria are often ambiguous, since the actual resources...
Application layer centralized business players, such as search engines, have revolutionized the Internet, by smartly mediating between the users' generic interests and the specific resources returned. Meanwhile, networks consistently neglect the human nature of demand, and persist in handling a-priori offered load expressed in terms of requests for precisely identified network resources. A twofold...
This paper describes the H.264 scalable video coding streaming evaluation framework (SVEF). This is the first open-source framework for experimental assessment of H.264 scalable video coding (SVC) delivery over real networks. Effectively adapting of the transport of an H.264 SVC stream to time-varying, bandwidth constrained, and loss prone networks is an important research area. However, very little...
This paper is among the first works to document experimental results for application-aware H.264 Scalable Video Coding (SVC) support over wireless LANs. Application-aware support is achieved by introducing a bandwidth throttling device, called Virtual Bottleneck (VBN), before the WLAN access point. Throttling is set to a bandwidth slightly smaller than the actual WLAN capacity (either known or estimated),...
This paper addresses the following foundational question: what is the maximum theoretical delay performance achievable by an overlay peer-to-peer streaming system where the streamed content is subdivided into chunks? As shown in this paper, when posed for chunk-based systems, and as a consequence of the store-and-forward way in which chunks are delivered across the network, this question has a fundamentally...
In recent years, the physical layer data rate provided by 802.11 Wireless LANs has dramatically increased thanks to significant advances in the modulation and coding techniques employed. However, previous studies show that the 802.11 MAC operation, namely the distributed coordination function (DCF), represents a limiting factor: the throughput efficiency drops as the channel bit rate increases, and...
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