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In Software Defined Networking, the role of the centralized controller is paramount. Some SDN controllers adopt a distributed clustering mechanism for keeping normal operation of the whole network. Unfortunately, the data loss and the lack of consistency are unavoidable in this approach, because many controllers depend on volatile memory to store most of the important data. In case of restarting or...
In this paper, we studied for the synchronization of CCNx that is one of the Content Centric Network (CCN) projects by using Hazelcast. CCN is considered as a way to solve the explosive growth of Internet traffic. Hazelcast is an open source In-Memory Data Grid. Hazelcast, that one of the consensus-based in-memory data grid, has the strength to speed, high-availability, and secure. To effectively...
It is obvious that Computer networks are plagued by Internet worms during last years. These worms has bad influence on the quality of internet services. Better development of worms filters is based on a complete vision of its behavior and methods of its spread. Moreover, reactions to attempted infections may slow down the highly infection rate of internet worms. Different factors affect the spread...
Hypertensive disorders are the most common problems during pregnancy. They cause about 10% of maternal deaths. The world mortality rate has decreased but many women are still dying every day from pregnancy complications. Various technic resources are being used in an integrated manner in order to minimize even more the death of both mothers and babies. Mobile devices with Internet access have a great...
In order to adapt the power grid to today's level of electricity consumption, growing investments are made in a smart power grid. The rising power demand curve can be restrained by a smart implementation of the new electrical power grid. The smart grid brings out an additional layer that will interconnect and manage all the generation, transmission and distribution sectors of the power grid. In this...
The traditional power grid system is a centralized and unidirectional system where the power flows from the power generation and distribution station and to the consumer. The smart grid aims to improve certain parameters of the classical power grid by providing more reliable and efficient use of electricity, a two-way flow of information between users and the utility station, improved energy storage...
Hot spot coverage requirements of indoor environments necessitate adequate network platforms and optimal network planning. Optimal network planning imposes numerous iterative computations and evaluations of network coverage until the optimal antenna layout is achieved. Typically, iterations within optimization algorithms invoke neighboring search functions where one of the antennas of a given antenna...
Non-Orthogonal Multiple Access (NOMA) is considered as a promising downlink Multiple Access (MA) scheme for future radio access. In this paper two power allocation strategies for NOMA are proposed. The first strategy is based on channel state information experienced by NOMA users. The other strategy is based on pre-defined QoS per NOMA user. In this paper we develop mathematical models for the proposed...
Cloud computing, an emerging paradigm, has shifted the shape of computing models from technology to a utility. However, data integrity, privacy, trust and secure cloud infrastructure are amongst the major issues which can subvert the wide benefits and deployment of cloud computing. Cloud computing uses virtualization to provide scalable, efficient and low cost IT services to users. The back bone of...
In this paper, we present a scheme to overlay machine-to-machine (M2M) traffic over human-to-human (H2H) communication under an orthogonal frequency division multiple access (OFDMA) framework. An intermittent short burst of M2M traffic is considered with a massive number of devices attempting to access the network. The proposed scheme solves the random access channel (RACH) congestion problem by allowing...
Energy-efficient operation is one of the prominent challenges for successful deployment of Wireless Sensor Networks (WSNs) along with maintaining certain quality of service (QoS) requirements. In this paper, we tackle the energy-efficient operation of WSN nodes implementation based on the Contiki real-time operating system (RTOS). We review the effect of applying spatial configuration for the radio...
Heterogeneous networks has recently evolved as one of the key enablers for future wireless technologies. The extremely growing mobile market, together with the arising demand for high data rates, force to off-load the main cellular network traffic. This can be accomplished by deploying small cells within the macro evolved-node base-station (eNodeB) coverage. Thus, more User Equipments (UEs) in the...
In this paper, we present a software defined radio-based platform created using LabVIEW and USRP 2920 in order to emulate a distributed antenna system (DAS) setup within an indoor LoS environment. In the proposed test bed, two USRPs are interconnected by MIMO cable and communicate with a single USRP receiver. The two transmitters are used to emulate two spatially separated OFDM transmitters by varying...
Through the simplifying assumption that a Thing has a single use or a small number of intended uses, it is possible to reduce the threat surface of the device by constraining the communication paths needed for those uses. This is accomplished using a small number of extensions to IEEE 802.1AR, a YANG model, DHCP, and IEEE 802.1AB, where a manufacturer maintains an online presence that is used inter...
The 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) cellular network is a promising system for machine-type communications (MTC). However, random access overload becomes a severe issue with the emerging massive number of MTC devices (MTCDs) in LTE network. To solve the problem, access class barring (ACB) and timing advance (TA) command comparison are two effective schemes by limiting...
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