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We analyze two commercial peer-to-peer (P2P) video streaming systems via active measurements: a tree-based overlay multicast and a mesh-based overlay. Our controlled IP test-bed allows us to reproduce near-identical network conditions for both the systems and to test them under varying network conditions and peer behavior. We report on the bandwidth efficiency of these P2P video streaming systems...
Hierarchical architectures are more and more widely adopted for organizing wireless sensor networks. In such architectures, middle-tier nodes take important roles, and preventing a malicious node from impersonating a middle-tier node and injecting falsified messages becomes critical. In this paper, we propose an energy efficient, distributed scheme to secure the multicast messages from the middle-tier...
To minimize the number of wavelengths required by a multicast session in sparse light splitting wavelength division multiplexing (WDM) networks, a light-hierarchy structure, which occupies the same wavelength on all links, is proposed to span as many destinations as possible. Different from a light-tree, a light-hierarchy accepts cycles, which are used to traverse crosswise a 4-degree (or above) multicast...
Broadcast and multicast services (BCMCS) in CDMA2000 wireless telecommunications networks restrict high- quality multimedia services to their intended recipients by encrypting content. The air specification of BCMCS includes the advance encryption standard (AES) block cipher in the security layer of the broadcast protocol suite. We surveyed the AES block cipher algorithm and characterized the time...
This paper shows how channel assignment in multicast terrestrial communication systems with different user populations and distributed channel occupancy detection can be improved using intelligence based on reinforcement learning. The schemes greatly reduce the number of reassignments and improve the dropping probability, at the expense of increased blocking. It is found that compared to detection...
We introduce prefix ordering for efficient multicasting (POEM), the first approach to multicast routing in MANETs in which the network-wide dissemination of control information is independent of the number of groups and sources per group. POEM establishes a labeled directed acyclic graph (LDAG) rooted at an elected node in the MANET and assigns a prefix label to each node denoting its network location...
This paper addresses the problem of dynamic multicast routing and wavelength assignment in delay constrained wavelength-routed WDM network. Current algorithms focus in minimizing blocking probability or wavelength numbers used, but not on the number of wavelength conversions. Wavelength conversions on either optical or electronics plane are costly and time consuming, hence should be minimized to ensure...
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