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The work in this paper studies the performance of Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) medium access control (MAC) mechanism in IEEE 802.11 DCF. From studying the propagation delay and clock synchronization differences between terminals, it is concluded that the slight timing differences, effectively a relative jitter, contributes to reducing the probability of collisions after...
Mobile cloud computing (MCC) has been proposed to offload heavy computing jobs of mobile devices to cloud servers managed by cloud service provider (CSP), which enables the mobile devices to save energy and processing delay. Heretofore, cloud offloading policies in mobile devices and pricing/scheduling in CSP have been independently addressed. This paper is first to jointly account for both sides...
The performance of wireless scheduling algorithms directly depends on the availability and accuracy of network state information at the scheduler. As channel state updates must propagate across the network, they are delayed as they arrive at the controller. The location of the controller directly affects the attainable throughput, as its dictates the delays with which information is obtained to make...
A novel architecture for the future data center networks with possibly up to a thousand of Top of the Rack (ToR) switches is proposed. The proposed architecture, WiCOD, relies on a wireless control plane serving an all-optical data plane. The first contribution of the work is the separation of the data and the control planes: while the data is switched between the ToR switches in an all-optical high...
Through real-world measurements we evaluate the impact of multihop-aware cooperative relaying on end-to-end route performance in wireless multi-hop networks. In an experiment with 50 devices in an industrial environment cooperative relaying increases the end-to-end transmission reliability for multi-hop links to nearly 100% while reducing the average packet delay. We suggest how to include relay selection...
In-network queuing in the Internet-style networks enables the distributed operation and scalability across the network at the cost of excessive delay and tardy flow completion times. Data center networking, in contrast, are proposed to depart from this classical approach and avoid in-network queuing all together. In this new class of network solutions serving interdata center traffic, a densely packed...
We study device-to-device (D2D) enabled hierarchical cellular networks consisting of a macro base station (BS), a dense network of access nodes (ANs) and mobile users, where spectrum is shared between cellular traffic and D2D traffic. Further, (the receivers of) mobile users dynamically time-share between the cellular and D2D networks. We develop algorithms for channel allocation and mobile-user receiver...
In wireless networks, where each node transmits independently of other nodes in the network (the ALOHA protocol), the expected delay experienced by a packet until it is successfully received at any other node is known to be infinite for the signal-to-interference-plus-noise-ratio (SINR) model with node locations distributed according to a Poisson point process. Consequently, the information velocity,...
This paper studies a cross-layer technique to increase the powering of an LTE macro base station from renewable energy. The cross-layer technique integrates the management of the transmit antennas and LTE frames with, at the application layer, video compression factor and data traffic delay. Importantly, the management of these cellular network components is integrated with the base station energy...
We consider a multihop wireless network with multiple users. The channels may experience fading. The power is consumed only during transmission and is a general monotonically increasing function of rate. We provide low complexity algorithms for joint routing, scheduling and power control which ensure stability of the queues, certain minimum rates and/or upper bound on the end-to-end, mean delays.
In this paper, we propose to reduce the energy consumption of cellular networks by leveraging coordinated cell switching algorithms with user cooperation. Cell switching consists in deactivating some base stations in periods of low load in order to reduce the power consumption, while the coverage is provided by remaining active base stations. We propose to maximize these periods of low power consumption...
A transmitter powered by a renewable energy source becomes self sustainable. In this paper, we consider the broadcast channel with a transmitter and N receivers. The transmitter is powered by a renewable energy source and has finite battery capacity. Transmitter requires power Pi to transmit a packet to ith user. In this setting, our objective is to minimize the expected backlog at the transmitter...
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