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Inter-vehicle and roadside-to-vehicle communications can contribute to a safer and more efficient driving experience by providing time-sensitive and location-aware information. However, its performance suffers from vehicle mobility, intermittent user connectivity, and wireless channel unreliability. In this paper, we propose a novel cross-layer optimization approach based on our Adaptive Distributed...
Our research team at the University of Nebraska's Advanced Telecommunications Engineering Lab (TEL) is working closely with the North American freight railroad industry to leverage wireless sensor networks (WSN) onboard railcars for advanced monitoring and alerting. Because freight train WSNs exhibit a linear chain-like topology of significant length, the existing IEEE 802.15.4 communication protocol,...
Application relay is important for many delay-sensitive applications such as voice over Internet protocol (VoIP). It has been proved that relay selection would be optimized considering autonomous domains (ASes) relationship. We describe a new method for relay selection using service discovery in distributed hash table(DHT) in which relay service advertisements are indexed and clustered according to...
SIP (session initial protocol) is a signaling protocol widely used in IP-based multimedia communication. Recently, P2PSIP reduces the deployment and maintenance cost, as well as improves the robustness and scalability of SIP-based system. SIP, P2PSIP network will coexist in the forthcoming future. This paper focuses on the P2PSIPand its relationship with SIP. We design and implement a P2PSIP adaptor,...
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