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The explosion of traffic demands within data centers accentuates the conventional infrastructures ossification. Unfortunately, the traditional tree based architectures struggle to resist and suffer from congestion and wiring complexity which deeply deteriorate the network performance. In aim to address the QoS degradation, we put forward a Hybrid Data Center Network (HDCN) architecture based on CISCO's...
Routing in dynamically changing node location scenarios is quite challenging and time consuming. The emerging wireless communication networks such as LTE advanced and 5G, device-to-device communications present such dynamically changing node locations. In mobile ad hoc networks, very often we come across such dynamically changing node location scenarios. In the Internet of things (IoTs), we will come...
Wireless Mesh Networks (WMNs) serve as a key enabling technology for various smart initiatives, such as Smart Power Grids, by virtue of providing a self-organized wireless communication superhighway that is capable of monitoring the health and performance of system assets as well as enabling efficient trouble shooting notifications. Despite this promise, the current routing protocols in WMNs are fairly...
Thanks to their flexibility and their simplicity of installation, Wireless Mesh Networks (WMNs) allow a low cost deployment of network infrastructure. They can be used to extend wired networks coverage allowing connectivity anytime and anywhere. However, WMNs may suffer from drastic performance degradation (e.g., increased packet loss ratio and delay) because of interferences and congestion. Generally,...
The expected higher complexity of upcoming 5G wireless backhauls suggests the need to evolve towards a softwaredefined networking (SDN) paradigm to increase the degree of programmability of these networks. Within the context of softwaredefined wireless backhaul, one important issue is the provision of an even resource consumption of both network and IT resources. Backpressure policies have shown their...
Wireless NoC is an emerging paradigm to design high-bandwidth and energy-efficient communication backbones for massive multicore chips. The achievable performance of this type of on-chip interconnect infrastructure depends on the efficiency of the Media Access Control (MAC) protocol that arbitrates between the competing wireless nodes. In this work we propose the design of a distributed MAC protocol...
Data centers face problems with concerns about instability in power supply systems caused by sharp changes in load such as power consumption by servers and diversification patterns in their power consumption. We have investigated a method of switching power flows by using power semiconductors via economical 920-MHz band wireless communication to control rises and falls in power in real time as a solution...
This paper investigates the achievable sum rate for a wireless multihop network (WMN) with unequal link capacities. We focus on a multi-source multicast scenario, where the nodes are operating in half-duplex mode. For this scenario, we propose a framework which fully utilizes the broadcast (BC) gain of the wireless medium through extended virtualization. Further, we show that our framework can switch...
Wireless sensor networks are composed of a large number of sensor nodes with limited energy resources. One critical issue in wireless sensor networks is how to gather sensed information in an energy efficient way since the energy is limited. The clustering algorithm is a technique used to reduce energy consumption. It can improve the scalability and lifetime of wireless sensor network. In this paper...
Software Defined Networking (SDN) and OpenFlow represent the most commonly deployed approaches of the so called Programmable Networks. SDN is an emerging network architecture, which performs the subdivision of control plane and data plane and allows greater speed, greater scalability, and greater ductility in terms of routing and forwarding. OpenFlow, instead, is an SDN component that characterizes...
We consider the controller design problem for discrete-time LTI systems with state feedback, when the actuation signal is subject to switching propagation delays, due to e.g. the routing in a multi-hop communication network. Even though the systems studied here are inherently switching systems, we show that their particular structure allows for analytical understanding of the dynamics, and efficient...
A vehicular backbone network (VBN) has the potential to augment the Internet with high-throughput data flows for delay-tolerant traffic. High-throughput flows require a joint utilization of transportation capacity for carrying data packets through physical mobility and wireless capacity for switching data packets from one route to another. This paper establishes a model that incorporates both transportation...
The millimeter (mm)-wave small-world wireless NoC (mSWNoC) is an enabling interconnect architecture to design high performance and low power multicore chips. As the mSWNoC has an overall irregular topology, it is extremely important to design suitable deadlock-free routing mechanisms for it. In this paper we quantify the latency, energy dissipation, and thermal profiles of mSWNoC architectures by...
While more and more wireless devices are phased in, binding relationship among them may become involved as wireless devices often operate in a self-organizing fashion. Though convenient, self-organization might fall short of user's expectation of flexibility sometime, leaving the user less room for binding adjustment. As a remedy, we propose a software-hardware codesign and implementation that enable...
Classical WMNs work in single-radio single-channel (SR-SC) architecture in which one network interface card (NIC) is deployed in each router and one common radio channel is shared by every mesh router. In this architecture, network endures from low capacity and throughput due to frequent back offs and packet collisions, hence single-radio multiple-channels (SR-MC) had been designed to enhance the...
Services to provide live streaming video from mobile sources are becoming widespread, including Ustream. It is expected that this type of services will be deployed particularly in local community networks using wireless mesh networks, in addition to the current services provided in the Internet. For providing live video streaming services in wireless mesh networks from mobile sources, adaptive multicast...
The Network-on-Chip (NoC) paradigm is used as a scalable interconnection infrastructure for multi-core chips. To enhance the performance of conventional interconnect-based multi-core chips, on-chip wireless interconnect has emerged as a radically different technology. However, this emerging interconnect paradigm imposes significant challenges pertaining to reliable integration and design. In this...
Interference and unreliability of wireless transmissions limit the throughput of wireless sensor networks. Multi-radio multi-channel technology shows its prospect to significantly improve the network capacity by reducing co-channel interference, and opportunistic cooperative offers a great chance to cope with the unreliability of wireless transmissions. In this paper, we present a multi-radio multi-channel...
A contact-less approach that connects chips in vertical dimension has a great potential to customize components in 3-D chip multiprocessors (CMPs), assuming card-style components inserted to a single cartridge communicate each other wirelessly using inductive-coupling technology. To simplify the vertical communication interfaces, static Time Division Multiple Access (TDMA) is used for the vertical...
In a sensor network there are many paths between a source and a destination. An efficient method to explore and navigate in the `path space' can help many important routing primitives, in particular, multipath routing and resilient routing (when nodes or links can fail unexpectedly) as considered in this paper. Both problems are challenging for a general graph setting, especially if each node cannot...
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