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360-degree video is on the cusp of going mainstream. Such videos have a large size (4-5⌉ the size of a regular one). Since each viewer has to wear Head-Mounted Display (HMD), screen sharing is impossible when a group is watching the same content. Multiple parallel video-streams will be required to serve a group of viewers along the last mile (think of a family or a group of friends watching...
We report the impact of device design parameters on the saturation voltages (VDSAT) and thereby on analog performance of the Tunnel FETs (TFET). As the drain bias (VDS) increases, the device initially enters a soft saturation and later into a deep saturation state, both at a constant difference between the gate-drain bias (VGD)· An increase in source (drain) doping decreases (increases) the soft saturation...
The problem of maximizing bandwidth along an arterial is addressed here by use of two combined control actions: traffic light offsets and recommended speeds. The optimization problem has been enriched in order to account for traffic energy consumption and network travel time, thus avoiding impractical or undesirable solutions. A traffic microscopic simulator has been used to assess the performance...
Vehicular Ad-hoc Networks (VANETs) has witnessed significant attention from academia and industries, due to the growing number of applications and devices focusing on safety and efficiency in transportation. Video Streaming in Vehicular Communication (VSVC) presents interactive real-time view of an emergency incidence on roads. On-board unit of vehicles are utilized for streaming real time video of...
The separated control and data planes in software-defined networking (SDN) with high programmability introduce a more flexible way to manage and control network traffic. However, SDN will experience long packet delay and high packet loss rate when the communication link between two planes is jammed by SDN-aimed DoS attacks with massive table-miss packets. In this paper, we propose FloodDefender, an...
Network Function Virtualization (NFV) is a promising technique to greatly improve the effectiveness and flexibility of network services through a process named Service Function Chain (SFC) mapping, with which different network services are deployed over virtualized and shared platforms in data centers. However, such an evolution towards software-defined network functions introduces new challenges...
In a software defined network (SDN), the control plane needs to frequently collect flow statistics measured at the data plane switches for different applications, such as traffic engineering, flow re-routing, and attack detection. However, existing solutions for flow statistics collection may result in large bandwidth cost in the control channel and long processing delay on switches, which significantly...
Delay and rate-based alternatives to TCP congestion-control have been around for nearly three decades and have seen a recent surge in interest. However, such designs have faced significant resistance in being deployed on a wide-scale across the Internet — this has been mostly due to serious concerns about noise in delay measurements, pacing inter-packet gaps, and/or required changes to the standard...
A voltage domain correction technique is proposed to mitigate the timing skew errors in time interleaved (TI) analog to digital converters (ADCs). The proposed technique exploits the fact that any timing skew in the sampling edge of a clock results in a corresponding error in sampled voltage that propagates through the ADC. The technique intends to cancel this voltage error by applying a correction...
The Dynamic Adaptive Streaming over HTTP (DASH) is specified to cope with the changing network conditions and provide an adaptive bit-rate HTTP-based streaming solution. While there have been many researches of rate adaptation algorithms on adaptive HTTP streaming, much of the work is focused on Video on Demand (VoD) service — which is not same as live streaming. It is generally preferred to minimize...
The current Internet should not only support simple packet forwarding, but also be able to provide diverse network functions to compose different routing services on the communication paths for network applications. Meanwhile, the user requirements for different applications are becoming more and more diversified, it is a challenge to distinguish the differences among these requirements in order to...
A fundamental problem to be resolved to achieve carrier grade functioning of an SDN network is the controller placement problem. The problem has been traditionally limited to optimally assigning switches to static physical controllers and placing those controllers over a network topology. However, virtualized controllers in place of physical ones could largely increase the dynamism in network control...
In this paper, we investigate multi-quality of service (QoS) routing and spectrum assignment in elastic optical networks (EONs) by utilizing network state information in terms of bandwidth usage and holding time of established connections. Toward this aim, two types of traffic, namely big data traffic (BDT) requests, and fixed rate flow requests (FLRs) are considered, where BDTs can tolerate a pre-determined...
Increasing over-the-top video consumption endangers the sustainability of content delivery over the Internet. Internet Service Providers (ISP) face difficulties in competing on value-added services with content providers and Content Delivery Network (CDN) operators. In this respect, we propose a new model for the collaboration between content delivery stakeholders, so that CDN operators can deploy...
Large absolute channel bandwidths at millimeter wave (mmWave) frequencies and more directional antenna gains may lead to quasi-deterministic (less random) channel fading behavior. Randomness in the cross polarization discrimination (XPD) is an attribute related to the channel fading behavior. In narrow-band channels, it is usually modeled as a log-normal random variable. From channel modeling perspectives,...
With Network Function Virtualization (NFV), network functions are deployed as modular software components on the commodity hardware, and can be further chained to provide services, offering much greater flexibility and lower cost of the service deployment for the network operators. At the same time, replacing the network functions implemented in purpose built hardware with software modules poses a...
Software-Defined Networking (SDN) can be applied for managing application flows dynamically by a logically centralized SDN controller and SDN switches. Because SDN switch only support a few thousand installations of a forwarding rule per second, its poor performance becomes a bottleneck for dynamic and scalable application flow management. For this reason, reducing the number of flows is needed to...
Network Function Virtualization (NFV) is an emergent paradigm that is currently transforming the way network services are provisioned and managed. The main idea of NFV is to decouple network functions from the hardware running them. This allows to reduce deployment costs and further improve the flexibility and the scalability of network services. Despite these benefits, a major challenge cloud providers...
Satellite networking is known to suffer from specific network performance issues, such as high latency and low throughput stability; this derives mainly from the high propagation delay, in particular with GEO satellites. This characteristic poses limitations on the benefits that general AQM solutions could introduce; in fact, reducing congestion and mitigating queueing delay is a vital feature that...
In software defined networks, control plane is decoupled from data plane and is directly programmable. Network controller retrieves an integrated view of data plane and thus an End-to-End (E2E) QoS guarantee is easier to realize than classic network paradigms. Deterministic Network Calculus (DNC) is a network analysis tool to provide a deterministic delay or bandwidth bound. In this proposal, an E2E...
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