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The Network Functions Virtualization (NFV) paradigm offers network operators benefits in terms of cost efficiency, vendor independence, as well as flexibility and scalability. However, in order to profit most from these features, new challenges in the area of management and orchestration of the virtual network functions (VNFs) need to be addressed.,,In particular, this work deals with the VNF chain...
The offers on cloud computing infrastructure have focused on providing computing and storage resources, and consider the network mostly as a required add-on and not truly as a resource itself. However, the need to have more robust solutions is becoming clearer. This paper argues that cloud infrastructure services will evolve and allow the definition of complete infrastructures that comprise both computing...
The paper analyses the outcomes of numerical studies into the effect of phase dispersion on broadband elements of a FMCW signal with varying central spectrum frequencies corresponding to the central frequencies of radio channels. We used the International Reference Ionosphere (IRI) model as the background ionosphere, which takes into account the spatiotemporal variability of the radio channel. The...
Today, in the cloud computing context, the network is starting to arise as a true resource itself and not just as a required connectivity add-on. The ability to define network resources (e.g. routing/switching elements, bandwidth) in this context is still scarce, but there are clear evidences that this is a future reality. In this article, we consider that cloud infrastructure services will allow...
New developments in energy efficient wireless communications systems and indoor location and tracking algorithms have created a greater demand for accurate propagation models. In this paper a frequency domain full wave propagation model is used to produce accurate power delay profile information. The propagation model is based on the volume electric field integral equation (VEFIE). The VEFIE is solved...
The dead-time and the other inverter nonlinearities known as the inverter non-idealities affect the output voltage and current distortions especially at low output voltages. The inverter non-idealities could be modeled as disturbances acting on the plant's (motor's) input. This paper discusses the effect of current controller design on the rejection of inverter non-idealities induced disturbances...
In recent times, there has been an increase in the number of mobile devices to access a variety of services on radio access network, and the trend is expected to continue. In addition, ultra-low latency services require much bandwidth and often characterized by having extremely short delay constraints. Hence, satisfying required strong QoS requirement becomes challenging task. Existing scheduling...
Peer to Peer (P2P) is a collection of peers in which each peer has their own power and responsibility. Peer communicates with other peers for accessing their services. This feature of P2P makes it vulnerable to different type of attacks. Trust and Reputation models can be used to minimize the impact of such threats. Maintaining trust in P2P network is required to enhance secure communication in peer...
This paper proposes an approach to solve the problem of LTE EPS network parametric synthesis taking into account self-similar properties of multiservice traffic. The problem is solved with the known source data such as network topology, traffic routes, statistical data on the demand for information and communication services. The article proposes the calculation expressions to determine the parameters...
This paper is devoted to the development of the extended multi-commodity flow model in order to provide optimal routing based on the criteria of quality of service and minimal maximal channel utilization. Since most of the models consider these criteria separately and do not consider different requirements of flows to quality of service, the proposed model allows to close this gap by allowing to achieve...
To reduce power consumption of smart phones, this work proposes a traffic regulation scheme for DRX-based LTE/LTE-A networks to support video-on-demand (VoD) services. To implement the time slicing at the base station for reducing power consumption of smart phones, a regulation buffer is allocated at the base station. All incoming packets for individual user equipments (UEs) are temporarily buffered...
In view of traffic flow equilibrium of all entrance lanes, considering the coordinated demand of every phase, a new signal control decision model for adjacent intersections based on coordination rate is established. According to the relationship between traffic parameters in the theory of traffic flow continuity, the rationality of the parameter is analyzed and the definition and calculation formula...
TCP is widely used for delay-sensitive applications including video streaming, voice, and instant messaging. Therefore, a performance parameter of interest is the end-to-end delay at the application level. In the past, much research was performed in the optimization of TCP's throughput. Besides throughput, delay is an important issue in todays networks. However, it was often disregarded. Amongst others,...
Routing in previous research works for bounded delay in Delay-Tolerant Networks (DTNs) tried their best to impose bounded delay on the message delivery. However, the existing routing protocols had a lot of issues due to the infinite buffer size and bandwidth assumption, where these resources are limited in realistic environment. In this paper, we modify and extend epidemic routing using ordinary differential...
Underwater sensor networks (UWSN) have two major challenges: limited bandwidth and high propagation delay. In-network processing can improve the performance of UWSN data flow in the network, leading to better channel utilization. In order to do this, processing nodes have to be deployed to perform local processing, such as compression, mining, and feature extraction on the collected data. In this...
In the paper an FPGA-based dynamic model exact tracking control system of a permanent magnet synchronous motor is presented. The parallel processing of motor control system using modern FPGAs allows the complex servo algorithms to be proceeded within a microsecond. In the paper a novel current control principle for a drive with a PWM inverter is presented. The experimental results prove that the current...
In this work, an end-to-end TCP throughput control mechanism based on TCP throughput model is proposed to fulfill the users' QoS requirements. To control end-to-end TCP throughput at single point, it is necessary to enforce a TCP connection operating at a target rate. Therefore, a measurement mechanism is proposed to derive the values of the two control parameters - packet drop rate and round trip...
This paper analyzes delays and resource efficiency when DASH segment files are transmitted through IP-based next-generation broadcasting systems such as ATSC 3.0. DASH segment files are designed to support media content of various qualities in the DASH system. The size of a DASH segment file can vary even though they may have the same quality and playback time. As the quantity of media content such...
Under the constraints of limited bandwidth and exponentially rising user demand, there is a dire need to maximize throughput. Maintaining Quality of Service (QoS) in a communication network demands congestion control with high accuracy. This paper focuses on this challenging task that incorporates design of effective congestion controller to reduce packet loss in cognitive radio networks. Limited...
In this paper, we consider the delay tolerable data traffic transmission in Heterogeneous Networks (HetNet) and propose a flow-level-delay constraint small cell sleeping scheme to achieve energy saving gain. We use the flow-level model to capture the process of data transmission in micro base station (BS) which is the small cell we consider. Our scheme takes advantage of the feature of HetNet and...
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