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As Wireless Sensor Networks (WSNs) are widely used in time-critical applications, e.g., factory automation and smart grid, the importance of Delay Constrained Relay Node Placement (DCRNP) problem is becoming increasingly noticeable. Considering the benefits in terms of energy efficiency and scalability brought by the two-tiered topology, this paper studies the DCRNP problem in two-tiered WSNs. To...
This paper investigates the number of multipath components in realistic wireless indoor channels. A measurement campaign was performed to collect channel realizations in the Stata Center on the MIT campus. We develop an algorithm with low computational complexity to extract multipath components from the measured waveforms. Based on the results obtained from the measured data, we quantify the behavior...
The range of parameter γ in FAST TCP are studied in this paper. A continuous time fluid flow model of the link buffer is considered to create a linear control system related to FAST TCP. Linearing the fluid flow model and window control model, the Laplace transform version of congestion control system are presented. It results in a negative feedback system with open loop transfer function. With the...
In the following paper, we study the tradeoff between network lifetime and network utility for energy-constrained wireless sensor networks (WSNs) with the real-time requirement. By introducing a parameter r, we combine these two objectives into a single weighted objective, and consider rate control and routing in this tradeoff framework simultaneously. For real-time requirement, we set up real-time...
Despite the recent and remarkable popularity of P2P IPTV systems, the study of their characteristics on largescale broadcasting is rare. In this paper, we have undertaken a measurement study on one of the most popular P2P IPTV systems, PPStream, during the 29th Olympics broadcasting. We deployed our dedicated measurement tool, PPS-Sniffer, under different network environments, and collected extensive...
P2P streaming technique is spreading widely and the study of its characteristics on large-scale broadcasting is meaningful and important. In this paper, we have undertaken a measurement on one of the most popular P2P IPTV systems, PPStream, during the 29th Beijing Olympics. We collected extensive data traces under different network environments. New and unique observations are presented in our study...
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