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To make full use of space/air resources, a Space-Air Integrated Network (SAIN) which is a hierarchical network with satellites, airships and hovering Unmanned Aerial Vehicles (UAVs) is constructed. Nowadays, Free Space Optical (FSO) links have been widely applied in SAINs since they provide high-rate and large-capacity data transmission. Unfortunately, the FSO links across the atmosphere would perform...
We focus on designing efficient integrated schedulers for handling mixed unicast and multicast traffic. We consider an input-queued switch with a multicast-capable switch fabric. At each input port of the switch, there are N dedicated unicast VOQs and one shared multicast queue (MQ). An existing approach to the design of integrated scheduler (i.e., a sequential scheduler) is to run two component schedulers,...
In this paper, we propose the concept of "channel+ beam" hando2642 (CBH) in cognitive radio networks (CRNs) with multi-beam smart antennas (MBSAs). We address the multi-class spectrum hando2642 issue, based on the user priority, by using the mixed Preemptive/Non-Preemptive M/G/1 queueing model with discretion rule. The discretion rule sets the threshold for the preemption of the low-priority...
Network Function Virtualization along with Network Service Chaining envision a reduction in the respective cost that end users, service providers, and network operators are experiencing, while providing complete and high quality services. However, the vast range of available services and the service on-demand model, creates dynamic traffic conditions that necessitates a flexible and automatic network...
We propose a high network utilization CONGestion- Aware load balancing approach, Multi-hop CONGA. It aims at improving the performance of handling traffic asymmetry, which happens occasionally in data centers. It leverages regular Clos topology and overlays for virtualization. In this paper, we schedule at the unit of flowlet, which is the burst of packets belonging to a flow, and make routing decisions...
The Dedicated Short Range Communication (DSRC) technology has been used in Vehicular communication to enable short-lived safety and non-safety applications based on Vehicle to Vehicle (V2V) communications over the Control Channel (CCH) and Vehicle to Infrastructure (V2I) communications over the Service Channels (SCHs) in Vehicular Ad hoc Networks (VANETs). With the under-utilized advanced computation,...
In fat-tree data center networks, routing a packet from its source to destination includes two phases, upstream (i.e. from source to watershed switch) and downstream (i.e. from watershed switch to destination). The throughput/non-blocking performance of networks hinges much on the effects of two phases above. In this paper, we propose a new routing algorithm called Global Round Robin (GRR) for fat-tree...
Network resource virtualization emerged as the future of communication technology recently, and the advent of Software Define Network (SDN) and Network Function Virtualization (NFV) enables the realization of network resource virtualization. NFV virtualizes traditional physical middle-boxes that implement specific network functions. Since multiple network functions can be virtualized in a single server...
As more and more data-intensive applications have been moved to the cloud, the cloud network has become the new performance bottleneck for cloud applications. To boost application performance, the concept of coflow has been proposed to bring application-awareness into the cloud network. A coflow consists of many individual data flows, and a coflow is completed only when all its component flows are...
Software-Defined Networking (SDN) controllers are considered as Network Operating Systems (NOSs) and often viewed as a single point of failure. Detecting which SDN controller is managing a target network is a big step for an attacker to launch specific/effective attacks against it. In this paper, we demonstrate the feasibility of fingerpirinting SDN controllers. We propose techniques allowing an attacker...
Future energy systems depend on a corresponding Information and Communication Technology (ICT) overlay, allowing timely transmission of critical grid information in particular in case of failures or other unanticipated events. Therefore, to maintain grid stability, Smart Grid communication networks are required to be highly reliable and real-time capable. Within this paper, we propose and evaluate...
Progressive download for multi-view video delivery is one of promising techniques to provide immersive and interactive experiences to users. In conventional multi-view video systems, a user downloads videos of all viewpoints of one content to realize smooth view switching. However, it causes increase of video traffic, and thus low video quality within an available download rate. To download only a...
In multi-channel cognitive radio ad hoc networks (CRAHNs), packet fragmentation is impacted by new factors besides those in traditional wireless networks due to the unique CR functions. For example, spectrum handoff is the technique for a secondary user (SU) to continue its transmission when a primary user (PU) reoccupies its current transmitting channel. Then, a short frame is less likely to be affected...
Information-centric networking (ICN) can bring many benefits to network operators, e.g., in-network request resolution via router's cache, and name-based forwarding. However, creating a smooth migration path from the current IP network to the ICN is a challenging task that must be investigated. Network function virtualization (NFV) is one of the key technologies to achieve this migration because of...
Software-Defined Networking (SDN) is a new paradigm that promises to enhance network flexibility and innovation. However, operators need to thoroughly assess its advantages and threats before they can implement it. Robustness and fault tolerance are among the main criteria to be considered in such assessment. The currently available SDN controllers offer different fault tolerance mechanisms, but there...
A single-RF transmitter based on repetitive pulse width modulation (RPWM) was proposed for an alternative system of multiple-input multiple-output (MIMO) system. However, the RPWM transmitter system has demerits which are to require switch modules with high resolution and twice the number of antenna elements than the conventional system. In the previous works, the relation of the switch resolution...
Today's indoor wireless networks employ reactive resource allocation methods to provide fair and efficient usage of the communication system. However, their reactive nature limits the quality of service (QoS) that can be offered to the user locations within the environment. In large crowded areas (airports, conferences), networks can get congested and users may suffer from poor QoS. To mitigate this,...
With the proliferation of cloud computing and the expected requirements of future Internet of Things (IoT) and 5G network scenarios, more efficient and scalable Data Centers (DCs) will be required, offering very large pools of computational resources and storage capacity cost-effectively. Looking at todays' commercial DCs, they tend to rely on well-defined leaf-spine Data Center Network (DCN) topologies...
To reduce the energy consumption of various information and communication systems, sleeping mechanism design is considered to be a key problem. Prior work has derived optimal single server sleeping policies only for non-bursty, memoryless Poisson arrivals. In this paper, for the first time, we derive the optimal sleep operation for a single server facing bursty traffic arrivals. Specifically, we model...
Virtual machine (VM) consolidation and switch/path consolidation are two typical techniques for improving energy efficiency in data centers (DCs). Most of existing work separately optimize VM consolidation and switch consolidation which results in inferiority of the optimization performance. Moreover, these work usually handle a user application as a VM flow (i.e., a source VM is connected to a destination...
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