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Due to the exponential growth of network users and applications, data center networks are facing the challenge of balancing the workloads. Software-Defined Networking (SDN) is a good candidate for solving the challenge as it provides the flexibility for each user by giving the programmatic control of each flow. However, previous load balancing strategies based on OpenFlow protocol do not consider...
In this paper, a throughput-aware transient fault detection method is presented with respect to the features of server processors. The proposed method takes the advantages of combination of reconfigurable redundant execution-based fault detection and speculative fault detection. The reconfigurable redundant execution-based fault detection method by using configuration manager module couples two free...
Paravirtual I/O devices are known to outperform emulated I/O devices but this performance improvement comes with two major drawbacks: Guest machine owners must install hypervisor-specific device drivers every time they switch hypervisors, and these device drivers must be implemented by the hypervisor providers for all major operating systems. Emulated devices do not suffer from these drawbacks because...
This work addresses an apparently simple but elusive problem that arises when doing high speed networking on Virtual Machines. When a VM and its peer (usually the hypervisor) process packets at different rates, the work required for synchronization (interrupts and “kicks”) may reduce throughput well below the slowest of the two parties.
Router buffers are the main reason for the Network-on-Chip's (NoC) scalable bandwidth, but consumes significant area and power. The SCEPTER bufferless NoC sets up single-cycle virtual express paths dynamically, allowing packets to traverse non-minimal paths without latency penalty. Using prioritization, bypassing, and throttling mechanisms, we maximize opportunities to use these paths while pushing...
HTTP (Hypertext Transfer Protocol) adaptive streaming is easy to configure in existing Internet infrastructure. Also, it is typically granted traversal of firewalls and NAT (Network Address Translator). Because of these advantages, HTTP adaptive streaming has been the subject of much attention. However, because conventional video quality adaptation schemes based on bandwidth measurement are too aggressive...
Network-on-Chip (NoC) is the communication backbone of multi-core and many-core processor architectures. Wormhole flow control is the commonly used flow control mechanism in on-chip interconnection networks, however it causes head-of-line blocking as network load increases which can be solved using virtual channel flow control. In this paper we investigate the effect of Virtual Channels (VC) on the...
The design of the media access control (MAC) protocols for mobile underwater acoustic networks (UANs) poses significant challenges due to the characteristics of underwater acoustic channels such as limited bandwidth, high bit error rate and long propagation delay. The reasons that existing underwater MAC protocols have shown poor performance, to a great extent, lie in the following aspects: 1) the...
In adaptive video streaming, rate adaptation is an important procedure for switching between different representations provided at the server, to cope with the network fluctuations. However, most of adaptation methods ever since mainly focus on the case of constant bitrate (CBR) video. In this paper, we present a new method that can effectively support variable bitrate (VBR) videos. Our method is...
This paper studies a wireless-powered communication network consisting of a hybrid access-point (AP) equipped with multiple antennas and a single-antenna user. The user is assumed to have no embedded power supply. Thus, it needs to first harvest energy from RF signals sent by the AP in the downlink (DL) before transmitting its information to the AP in the uplink (UL). We consider the scenario that...
In recent years a lot of new consumer devices have been introduced to the home network. Modern home networks usually consists of multiple heterogeneous communication technologies such as Ethernet, Wi-Fi and power-line communications. Today, the user has to manually decide which transmission technology to use as there is no automated optimization across technologies. Load balancing algorithms can improve...
The Tor network is a widespread overlay anonymous network that is used by millions of users today. Tor focuses on improving the privacy of its users by routing their traffics through a series of onion routers that are located around the world. Since Tor operations mainly depend on volunteers who donated onion routers in the network, there are variances of capacities amongst different onion routers,...
Complexity and flexibility are the main problems that will be faced in the world of the future network. To be able to answer these problems, a method called Software Defined Network (SDN) is being developed. The SDN concept is to separate the network's controller and forwarding plane of the hardware. In this research, SDN component, white box switch was built. To test its performance, RTT and throughput...
Nowadays, Multiprocessor System on Chip (MPSoC) system performance is often limited by the growing interconnection between processing elements. Network on Chip (NoC) as an interconnection platform is becoming a promising solution due to its scalability and reusability over conventional bus-based interconnection. An NoC router is the vital component in the NoC architecture. Efficient router leads to...
This paper presents advanced spatial focusing algorithms and their performance covering fixed and mobile hotspots (HS) for backhaul within the context of millimeter wave (mmWave) overlay networks. For Fixed HS (FHS), Time Reversal (TR) and Equal Gain Transmission (EGT) techniques are recommended and optimized under Multiple Input Single Output (MISO) deployments within the context of Wi-Fi HS extensions...
HTTP streaming has become a cost effective means for video delivery nowadays. To enable adaptivity to networks and terminals, a provider should generate multiple representations of an original video as well as the related signaling metadata. So far, most previous studies have just focused on the case of CBR (constant bitrate) video. In this paper, we propose a novel adaptation method for VBR (variable...
The demand for video streaming has been soaring in recent years. However, there is a gap between traffic demand and link capacity due to time-varying throughput fluctuation. This fluctuation results in poor quality video streaming services. The most well-known technique to improve the quality of video streaming is: adaptive video streaming. This technique adjusts the video bit-rate to the time-varying...
We propose a design to aid experimentation with SDN architectures using legacy network equipment. We implement a portion of the design on an FPGA and evaluate throughput and latency. Results indicate viability for testbed and research environments, especially with proposed additions to further reduce latency in broadcast- and multicast-heavy traffic.
Live streaming services over HTTP used on smart devices via a mobile network have become very popular. However, playback interruption often occurs during a live streaming. This is because TCP throughput fluctuates due to radio strength variation and cross-traffic, and the playback buffer on the client side is small. To solve the playback interruption problem, adaptive rate control techniques are helpful...
Efficient intersection control represents a major challenge in traffic management, as it can contribute to reducing traffic congestion and travel times. Communicating vehicles, for instance using VANETs, open up new opportunities for intersection control, providing fairness and throughput to transportation networks. In this paper, we are interested in the tradeoffs between fairness and throughput...
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