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Energy consumption is a critical concern in data centers as extremely huge amount of energy is consumed every year, a major part of which is used by cooling system. Though cooling system consumes large amount of energy, data centers lack the knowledge of whether energy is efficiently used or not. Recently temperature sensors are increasingly deployed to monitor data center temperature, but where to...
Admission and rate control are key components for providing QoS (Quality of Service) flows in multi- rate wireless ad hoc networks where transmission rate at the physical layer is adapted dynamically according to the channel condition. Key to these controls is the formulation of a rate constraint that can regulate the flow rate passing through each node. This paper formulates a cross-layer rate constraint...
Traditional medium access control (MAC) protocols utilize temporal mechanism to do contention resolution. This paper explores an alternative approach by adapting the space occupied by a transmission to resolve contention. Each successful transmission in a wireless network needs to occupy a certain part of space in which there are no other simultaneous transmissions. The size of the space occupied...
This paper proposes a set of node-based rate constraints called NABE (node-based available bandwidth estimation) to model the interference relationship among nodes in a wireless ad hoc network and to provide rate constraints for its QoS flows. We evaluate the performance of NABE from three different perspectives: its capacity, its complexity to implement the MAC layer protocol and its efficiency....
To provide reliable transmission in wireless ad hoc networks, two problems need to be solved. The first one is to find reliable routes for packets transmission. And the second one is to re-route packets as soon as possible when route failures occur. Aiming at solving these two problems, this paper proposes a reliable routing algorithm called QDSR by making two improvements to DSR. Integrating ETX...
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