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Current technologies to include cloud computing, social networking, mobile applications and crowd and synthetic intelligence, coupled with the explosion in storage and processing power, are evolving massive-scale marketplaces for a wide variety of resources and services. They are also enabling unprecedented forms and levels of collaborations among human and machine entities. In this new era, trust...
Dynamicity and infrastructure-less nature of MANETs expose the routing in such networks to a variety of attacks, and moreover, make the conventional fixed policy routing algorithms inefficient. To deal with the routing challenges and varying behavior of malicious nodes in such networks, employing reinforcement learning algorithms and proper trust models seem promising. In this paper, we introduce...
A quasi-orthogonal space-time block code (Q-OSTBC) has been proposed to achieve a better multiplexing-diversity tradeoff. With unequal diversity order of symbols, the code can effectively mitigate the error propagation in the successive interference cancellation (SIC) based detector for each user. As well known, non-orthogonal multiple access (NOMA) has been recognized as a promising technique for...
Due to the volatile network topology and time-varying channel conditions, high-efficient data transmission in Vehicular Ad-hoc Networks (VANETs), especially for error-prone channels, is a challenging task. In the paper, we investigate traffic scheduling based on the Remaining Delay (RD) and propose an adaptive frame length aggregation stategy with the RD limit in VANETs. In our scheme, we classify...
In a wireless ad hoc multimedia network, how does the Quality of Experience (QoE) of the user affect the level of Situational Awareness (SA)? Is maximum QoE necessary for high SA? In this empirical study, we propose a novel measurement approach to quantify SA based on the QoE of the user. The relationship between QoE and network Quality of Service (QoS) metrics such as delay and packet loss is well...
Key-value stores (e.g., Memcached) and web servers (e.g., NGINX) are widely used by cloud providers. As interactive services, they have strict service-level objectives, with typical 99th-percentile tail latencies on the order of a few milliseconds. Unlike average latency, tail latency is more sensitive to changes in usage load and traffic patterns, system configurations, and resource availability...
Distributed, networked communication systems, such as relay beamforming networks are typically designed without considering how the positions of the respective nodes might affect the quality of the communication. That is, network nodes are either assumed to be stationary in space, or, if some of them are moving while communicating, their trajectories are assumed to be independent of the respective...
Long Term Evolution (LTE) and LTE-Advanced are traditionally defined for human to human (H2H) communication, they are excellent candidates as a communication technologies in the smart grid environment. The 3GPP standard recently adopted the use of LT E to support low powered sensor devices which they classify as machine type communication (MTC). In this work we evaluated the performance of widely...
In telecommunication networks resilience intuitively refers to cycles and their lengths. More specifically, considering that the shortest cycle involving each pair of nodes in the network can be disassembled into two disjoint paths, a working path and a backup path, the average of the shortest cycles involving each pair of nodes in the network can be considered as an indicative of resilience. In turn,...
There are several reports and white papers which attempt to precise 5G architectural requirements presenting them from different points of view, including techno-socio-economic impacts and technological constraints. Most of them deal with network slicing aspects as a central point, often strengthening slices with slice isolation. The goal of this paper is to present and examine the isolation capabilities...
Today many applications require a high Quality of Service (QoS) to the network, especially for real time applications like VoIP services, video/audio conferences, video surveillance, high definition video transmission, etc. Besides, there are many application scenarios for which it is essential to guarantee high QoS in high speed mobility context using an Internet Mobile access. However, internet...
An analysis of next generation network architectures enabling real time multimedia communications is presented in this paper. Current network architectures are not able to support real time multimedia communications for immersive application exploiting virtual or augmented reality. After the presentation of the state of the art a discussion of open issues and future research direction is presented...
The current and future trend in building and home automation sees an increasing pervasiveness of Internet of Things technologies, that allow to implement networks of low power sensors and actuators, and, at the same time, to enable advanced services and applications. In this paper we propose the use of a common protocol in the IoT domain, the MQTT, over a LoRa physical communication link, to jointly...
This paper offers a comparative analysis of quality of service (QoS) of the queuing disciplines Priority Queuing (PQ), Custom Queuing (CQ), Weighted Fair Queuing (WFQ), Class-Based Weighted Fair Queuing (CBWFQ) and Low-Latency Queuing (LLQ), with self-similar and long-range dependent traffic, through experimental measurements with routers. We take into account two different classes of traffic: real-time...
Networked embedded software systems incorporate varying degrees of adaptation behavior to sustain their operations with acceptable quality of service (QoS), in the face of hostile external events. For instance, a highly agile cruise control system of a car may dynamically adjust its controller parameters to generate a higher-than-normal increase in torque when encountering a higher road elevation...
Multi-tenancy in cloud-based applications helps cloud providers improve their Quality of Service (QoS) and reduce service customization and maintenance time. This result is achieved by sharing resources among many tenants, which can be in the form of applications composed of multiple web services. However, distinct tenants may impose different security requirements on their perspective of the application...
Live media streaming applications are increasingly popular, with services such as Twitch.tv and YouNow being used by millions of people. Deploying such services on the cloud can be very expensive, as the cost is proportional to the amount of data transferred to the users. However, adopting a much less costly peer-to-peer (P2P) solution may reduce the overall quality-of-service (QoS) experienced by...
Many mission critical infrastructure systems directly impact the longevity and the usefulness of the systems they support. Heating and cooling equipment (HVAC) are important support equipment for sensitive industrial systems including manufacturing, IT, high tech testing and measuring equipment. Therefore it is important to monitor functionality and health of this sensitive equipment. Moreover, it...
The idea of Industry 4.0 includes the concept of Industrial Internet of Things (IIoT) that is the possibility for industrial devices to have Internet connection and share data. Huge amount of data are stored and analyzed in the Cloud to extract meaningful information to be sold as "services". Today, many Industry 4.0 scenarios do not require a short latency between data collection and output...
Streaming media applications generate a sizable part of network traffic and represent a significant proportion of network providers' income. The commitment to user satisfaction can be summarized by different concepts, content providers emphasizing quality of experience (QoE), whereas network providers are more focused on quality of service (QoS). Measuring QoS parameters, and understanding the relationship...
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