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Farzad Tashtarian

Farzad Tashtarian
Alpen-Adria-Universität Klagenfurt, Austria · Information Technology

PhD

About

58
Publications
10,643
Reads
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441
Citations

Publications

Publications (58)
Article
Full-text available
Recent studies have shown that utilizing a mobile sink (MS) to harvest and carry data from a wireless sensor network (WSN) can enhance network operations and increase the network lifetime. Since a significant portion of sensor nodes' energy is consumed for data transmission to an MS, the specific trajectory has a profound influence on the lifetime...
Conference Paper
Full-text available
The Session Initiation Protocol (SIP) is an application-layer control protocol for creating, modifying and terminating multimedia sessions. An open issue is the control of overload that occurs when a SIP server lacks sufficient CPU and memory resources to process all messages. We prove that the problem of overload control in SIP network with a set...
Article
Full-text available
Remarkable lifetime improvement has been revealed by controlling sink movement in Wireless Sensor Networks (WSNs). This paper proposes a framework for deadline-based and constant bit rate applications to maximize the lifetime of WSN. By dividing all sensor nodes into clusters, a Mini Data Collector (MDC) node which is responsible for data collectio...
Conference Paper
Full-text available
One of the challenges in wireless sensor network is prolonging the network lifetime for sustaining long-term operation with limited resources. The energy of sensor nodes is mostly utilized for data transmission to the Sink. So many researches have been done about reducing sensor nodes energy consumption. Nonetheless, the most part of such researche...
Article
Edge Cloud Computing (ECC) is a new approach for bringing Mobile Cloud Computing (MCC) services closer to mobile users in order to facilitate the complicated application execution on resource-constrained mobile devices. The main objective of the ECC solution with the cloudlet approach is mitigating the latency and augmenting the available bandwidth...
Article
Recent advances in embedded systems and communication technologies enable novel, non-safety applications in Vehicular Ad Hoc Networks (VANETs). Video streaming has become a popular core service for such applications. In this paper, we present QoCoVi as a QoE- and cost-aware adaptive video streaming approach for the Internet of Vehicles (IoV) to del...
Conference Paper
HTTP Adaptive Streaming (HAS) has become a predominant technique for delivering videos in the Internet. Due to its adaptive behavior according to changing network conditions, it may result in video quality variations that negatively impact the Quality of Experience (QoE) of the user. In this paper, we propose Days of Future Past, an optimization- b...
Conference Paper
Full-text available
Recent studies have revealed that network-assisted techniques, by providing a comprehensive view of the network, improve HTTP Adaptive Streaming (HAS) system performance significantly. This paper leverages the capability of Software-Defined Networking, Network Function Virtualization, and edge computing to introduce a CDN-Aware QoE Optimization in...
Conference Paper
Full-text available
Recently, HTTP Adaptive Streaming (HAS) has become the dominant video delivery technology over the Internet. In HAS, clients have full control over the media streaming and adaptation processes. Lack of coordination among the clients and lack of awareness of the network conditions may lead to sub-optimal user experience, and resource utilization in...
Article
Full-text available
Due to the growing demand for video streaming services, providers have to deal with increasing resource requirements for increasingly heterogeneous environments. To mitigate this problem, many works have been proposed which aim to (i) improve cloud/edge caching efficiency, (ii) use computation power available in the cloud/edge for on-the-fly transc...
Article
Full-text available
Live video streaming traffic and related applications have experienced significant growth in recent years. However, this has been accompanied by some challenging issues, especially in terms of resource utilization. Although IP multicasting can be recognized as an efficient mechanism to cope with these challenges, it suffers from many problems. Appl...
Article
Although mobile devices have experienced voluminous proliferation throughout the last decade, there are limited resources in terms of their portable size. Such limitations could be mitigated by remote execution of the computation-intensive tasks to the cloud. By creating a cluster of servers (a.k.a. “Cloudlets”) to the network edge and close to the...
Article
Full-text available
This paper investigates the performance of multi-critera based load-balancing scheme among gateways in fog-assisted Internet of Things (IoT). We employ a queueing model of the IoT system to calculate the latency of data streams from IoT devices to the applications. However, a gateway node may easily become congested since all the traffic to IP netw...
Article
Full-text available
Due to the limited energy of sensor nodes in wireless sensor networks, extending the network lifetime is a major challenge that can be formulated as an optimization problem. In this paper, we propose a distributed iterative algorithm based on alternating direction method of multipliers with the aim of maximizing sensor network lifetime. The feature...
Article
Service Function Chain (SFC) provides an end-to-end service by processing traffic flow through a series of Virtual Network Functions (VNFs) in a specific order. Satisfying user’s demands (e.g, end-to-end delay) on one hand and minimizing the cost of SFC deployment in terms of energy and resource on the other hand, introduces VNFs placement as a cru...
Preprint
HTTP adaptive streaming (HAS) is quickly becoming the dominant video delivery technique for adaptive streaming over the Internet. Still considered as its primary challenges are determining the optimal rate adaptation and improving both the quality of experience (QoE) and QoE-fairness. Most of the proposed approaches have relied on local information...
Article
Full-text available
HTTP adaptive streaming (HAS) is quickly becoming the dominant video delivery technique for adaptive streaming over theInternet. Still considered as its primary challenges are determining the optimal rate adaptation and improving both the quality ofexperience (QoE) and QoE-fairness. Most of the proposed approaches have relied on local information t...
Preprint
Full-text available
Due to the limited energy of sensor nodes in wireless sensor networks, extending the networks lifetime is a major challenge that can be formulated as an optimization problem. In this paper, we propose a distributed iterative algorithm based on Alternating Direction Method of Multipliers (ADMM) with the aim of maximizing sensor network lifetime. The...
Conference Paper
Full-text available
HTTP adaptive streaming (HAS) is quickly becoming the dominant video delivery technique for adaptive streaming over the Internet. Still considered as its primary challenges are determining the optimal rate adaptation and improving both the quality of experience (QoE) and QoE-fairness. Recent studies have shown that techniques providing a comprehens...
Conference Paper
Full-text available
This paper offers a form of filtration based on moving average filter and KNN imputation method, for pre-processing hourly electricity load data for Short-Term Load Forecasting (STLF). The STLF is developed by the Adaptive Network Based Fuzzy Inference System (ANFIS). There is a lack of data pre-processing related to load forecasting, especially ST...
Conference Paper
Full-text available
Network Functions Virtualization (NFV) is a promising network architecture where network functions are virtualized and decoupled from proprietary hardware. In modern datacenters, user network traffic requires a set of Virtual Network Functions (VNFs) as a service chain to process traffic demands. Traffic fluctuations in Large-scale DataCenters (LDC...
Article
Full-text available
Network Functions Virtualization (NFV) is a promising network architecture where network functions are virtualized and decoupled from proprietary hardware. In modern datacenters, user network traffic requires a set of Virtual Network Functions (VNFs) as a service chain to process traffic demands. Traffic fluctuations in Large-scale DataCenters (LDC...
Article
In the past few years, datacenter (DC) energy consumption has become an important issue in technology world. Server consolidation using virtualization and virtual machine (VM) live migration allows cloud DCs to improve resource utilization and hence energy efficiency. In order to save energy, consolidation techniques try to turn off the idle server...
Conference Paper
Full-text available
In the past few years, datacenter (DC) energy consumption has become an important issue in technology world. Server consolidation using virtualization and virtual machine (VM) live migration allows cloud DCs to improve resource utilization and hence energy efficiency. In order to save energy, consolidation techniques try to turn off the idle server...
Article
Full-text available
Network performance can be improved by using a mobile sink (MS) to collect sensed data in a wireless sensor network. In this paper, we design an efficient trajectory for MS, collecting data from sensor nodes in a multihop fashion, with the aim of prolonging the network lifetime. Considering event-driven applications, we present an approach to joint...
Article
Full-text available
Network functions virtualization provides opportunities to design, deploy, and manage networking services. It utilizes Cloud computing virtualization services that run on high-volume servers, switches and storage hardware to virtualize network functions. Virtualization techniques can be used in IP Multimedia Subsystem (IMS) cloud computing to devel...
Article
Full-text available
This paper proposes a mathematical optimization model to maximize the lifetime of wireless sensor networks through determining the optimal trajectory (OT) of mobile sink (MS). We address deadline and event based applications where by capturing an event, a sensor node has to send its data to MS in a restricted time slot defined as a deadline. We dem...
Article
Full-text available
Session initiation protocol (SIP) is an application layer signalling protocol for the set-up, management and termination of multimedia networks such as voice over IP standardised by Internet Engineering Task Force. This protocol has also been recognised by International Telecommunication Union as a main core of next-generation networks. When this n...
Conference Paper
Full-text available
The Session Initiation Protocol (SIP) is an application-layer control protocol for creating, modifying and terminating multimedia sessions. An open issue is the control of overload that occurs when a SIP server lacks sufficient CPU and memory resources to process all messages. We prove that the problem of overload control in SIP network with a set...
Conference Paper
Full-text available
The routing algorithm is one of key researches of interconnection networks and wireless sensor networks (WSN) design. A routing algorithm defines a route which packet traverses to get to destination. In this paper we study some kinds of routing algorithms which are used in interconnection networks and wireless sensor networks separately. First, we...
Conference Paper
One of the most critical issues in wireless sensor networks is the limited energy availability of the network nodes. This paper is investigating the advantages of using controlled sink mobility in clustered wireless sensor networks (WSNs) which increases network lifetime. In a clustered sensor network all Cluster Heads (CHs) have to transmit their...
Article
Clustering methods are potentially the framework for power-conserving wireless sensor networks. These methods are among the most effective approaches aiming for prolonging the lifetime. Power-limited nature of the employed devices in wireless networks made the conventional clustering approaches to mainly focus on selecting cluster heads-which are t...
Conference Paper
Full-text available
Energy efficiency and long network lifetime has been of a great interest in wireless sensor networks. In addition to delivering data to the base station, a routing protocol must be energy efficient. An efficient routing technique is known as hierarchical routing based on clustering. In this paper, wireless sensor network is considered with a mobile...
Article
Full-text available
In this paper, two clustering algorithms are proposed. In the first one, we investigate a clustering protocol for single hop wireless sensor networks that employs a competitive scheme for cluster head selection. The proposed algorithm is named EECS-M that is a modified version to the well known protocol EECS where some of the nodes become volunteer...
Article
The key issue of designing protocols for Wireless Sensor Networks (WSN) is Energy efficiency what needs to be enhanced to improve the entire network's lifetime. In this paper, we proposed EELLER that stands for Energy Efficient-Low Latency Express Routing. It is a hierarchical routing protocol based on clustering to minimize the number of hops requ...
Article
Clustering methods are potentially the framework for power-conserving wireless sensor networks. These methods are among the most effective approaches aiming for prolonging the lifetime. Power-limited nature of the employed devices in wireless networks made the conventional clustering approaches to mainly focus on selecting cluster heads -which are...
Article
Full-text available
Clustering methods are potentially the framework for power-conserving wireless sensor networks. These methods are among the most effective approaches aiming for prolonging the lifetime. Power-limited nature of the employed devices in wireless networks made the conventional clustering approaches to mainly focus on selecting cluster heads -which are...
Article
Dramatic development of the wireless sensor networks (WSNs) in several applications is seeking for multi-application implementation of such networks. In this way, the middlewares contain a runtime environment that supports and coordinates multiple applications. In this paper, a middleware is proposed to support multi-application network that simult...
Conference Paper
Full-text available
Since there is no fixed infrastructure or centralized management in wireless sensor network (WSN), a connected dominating set (CDS) has been proposed as a virtual backbone. The CDS plays a major role in routing, broadcasting, coverage and activity scheduling. To reduce the traffic during communication and prolong network lifetime, it is desirable t...
Conference Paper
In this paper, we investigate a clustering protocol for single hop wireless sensor networks that employs a competitive scheme for cluster head selection. The proposed algorithm is named EECS-M that is a modified version to the well known protocol EECS where some of the nodes become volunteers to be cluster heads with an equal probability. In the co...
Conference Paper
This article introduces an event driven data reporting and routing algorithm for wireless sensor networks that offers a local timing based data reporting scheme in a clustered network. When an event occurs, the nodes that has discovered the event, are supposed to report it to their respective cluster heads. All of these nodes would wait for a speci...
Conference Paper
Hierarchical clustering algorithms are very important in increasing the networkpsilas life time. In this paper, we developed the previous proposed algorithm EELTC (An Energy-Efficient Level-based and Time-based Clustering algorithm for Wireless Sensor Networks) that is called EELTC-M (modified EELTC). It is a new hierarchical clustering algorithm a...
Conference Paper
Clustering the nodes and controlling the number of cluster heads and members provides an effective way of energy efficiency. In this paper, we develop a clustering protocol for single hop wireless sensor networks. In the proposed algorithm some of the nodes become volunteers to be cluster heads. We develop a time based competitive clustering algori...
Conference Paper
In recent years, there has been a growing interest in wireless sensor networks. One of the major issues in wireless sensor network is developing an energy-efficient clustering protocol. Hierarchical clustering algorithms are very important in increasing the network's life time. Each clustering algorithm is composed of two phases, the setup phase an...
Conference Paper
Rumor routing is a classic routing algorithm based on the random walk of agents. In this paper, a method to improve the performance of this routing algorithm is proposed. Here, we try to improve the latency and energy consumption of the traditional algorithm using propagation of query and event agents in straight lines, instead of using purely rand...

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