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In this work, we model route updates as part of Quality of Service (QoS) Virtual Network Function (VNF) in Software-Defined Networking (SDN) architecture. In SDN, the control plane and the data plane are decoupled. This allows high flexibility by providing abstractions for network management applications and being directly programmable. However, reconfiguration and updates of a network are sometimes...
Joint pushing and proactive caching holds the promise of significantly increasing the throughput and decreasing the latency of content-centric wireless networks. In this work, we import the pushing and caching mechanism into a traditional packet-oriented network for decreasing the average queueing delay. Since the decreasing relies on extra costs paid for the pushing-caching mechanism, such as the...
This paper briefly introduce a method to evaluate the reliability of a cloud rendering system by using probability models. An extended discrete-time Markov chain (DTMC) is proposed considering the QoS (Quality of Service). Then, some properties defined from 3 aspects give full consideration to the processes of rendering tasks, which can be verified by performing PRISM in a quantitative way. Finally,...
Proliferation of mobile digital devices has posed major challenges for design and implementation of Wireless Local Area Networks (WLANs), leading to stringent quality of service (QoS) requirements. Extreme burstiness and correlation characteristics of multimedia traffics generated by digital devices require accurate modelling and analysis to provide satisfactory end user experience. Most existing...
Markov-modulated Poisson Process (MMPP) has been extensively studied in random process theory and widely used as a network traffic model. Most methods for estimating MMPP parameters are based on the exact arrival times. Nevertheless, in many applications it is costly to record the exact time of each arrival. Instead, we only record the number of arrivals in fixed-length time slots, which is called...
State-of-the-art communication networks feature complex Quality of Service and mobility management policies, resulting in tremendous signaling growth. The mobility management related signaling is subject to a further increase due to automotive users or connected cars, which demand more mobility management efforts due to higher speeds. In this paper, we approach signaling reduction by adaptively forming...
The problem of performance evaluation of a wireless sensor node with energy harvesting is formulated as the problem of analysis of the stationary distribution of a single-server queueing system with two finite buffers to which flows of customers and energy units arrive. A unit of energy is required for service of a customer. If energy is not available, service is terminated. To account realistic situations...
This paper introduces an approach that handleswith the trustworthy cloud service selection issue in Cloudcomputing environments. Despite the fact that most of theexisting trust systems consider several QoS attributes for trustcomputing, none of them did consider the correlation that mayexist among these attributes. However, we demonstrate in thispaper that the integration of correlation between QoS...
Application of Software Defined Network (SDN) and Network Function Virtualization (NFV) paradigms to telecommunications networks are determining an evolution towards a so-called Software Defined Infrastructure (SDI), where network and service functions are developed and controlled as software applications. Management and orchestration of resources are key elements in this softwarization process. To...
Auto-scaling, a key property of cloud computing, allows application owners to acquire and release resourceson demand. However, the shared environment, along with theexponentially large configuration space of available parameters, makes configuration of auto-scaling policies a challenging task. Inparticular, it is difficult to quantify, a priori, the impact of a policyon Quality of Service (QoS) provision...
Today, many large usages of computer systems, cloud computing, high-performance networks and their connections through networks are available electronically and they rapidly increased. These large-scale networks are fault tolerant and require a repairmen policy for maximising Quality of Service (QoS). However, obtaining QoS of large-scale networks analytically is difficult due to the state space explosion...
The playout buffer occupancy of a mobile user watching a video on a cellular wireless network is modeled analytically as Markov fluid queue. The probability of video freeze that is observed upon buffer drain is computed depending on adaptive playout rate, rate adaptation threshold and pre-play buffering. An optimization problem concerning these three parameters is formulated.
It has been said that dynamic guard channel (DGC) assignment scheme based on traffic intensities averages QoS and performs better than the prioritized guard channel assignment scheme with queue (QPGC) during traffic congestion. This work has extended the investigation to DGC with queue (QDGC) and carried out its comparison with other call traffic channel assignment schemes. Mathematical analysis of...
In this paper, throughput of hybrid automatic repeat request (HARQ) schemes is studied in the presence of Markovian data arrivals and statistical queuing constraints. In particular, two queuing models are considered. Specifically, when outage occurs, the transmitter keeps the packet, lowers its priority, and attempts to retransmit it later in the first queue model while the packet is discarded and...
The IEEE 802.11p standard drafted to support wireless access in vehicular environments (WAVE) or vehicular ad hoc network (VANET) which uses Enhanced Distributed Channel Access (EDCA) mechanism for the contention-based prioritized Quality of Service (QoS) at the MAC layer. The EDCA mechanism defines four access categories (ACs). Each AC queue works as an independent DCF station (STA) with Enhanced...
The paper concerns design of control systems for Demand Dispatch to obtain ancillary services to the power grid by harnessing inherent flexibility in many loads. The role of “local intelligence” at the load has been advocated in prior work; randomized local controllers that manifest this intelligence are convenient for loads with a finite number of states. The present work introduces two new design...
Dynamic spectrum allocation techniques are usually based on the assumption of a homogeneous cognitive radio network. In this work we describe a Continuous time Markov chain model that allows different types of bandwidth requirements and priority traffic. We have improved the lowest priority user's performance using channel aggregation and fragmentation, which are mechanisms envisioned for the LTE-A/4G...
Due to the increasing penetration rate of Plug-in Electric Vehicles (PEVs), the infrastructure planning of PEV fast charging stations is under way. Owing to the environmental friendly property of the Renewable Energy Source (RES), Photovoltaic (PV)-integrated fast charging stations are proposed to facilitate the RES utilization and to minimize the station operation cost. However, the intermittent...
Cloud computing has become one of the most dominant features in the computing area nowadays. The hardware of the datacenter can be get virtualized and create multiple Virtual Machine (VM) instances on a single Physical Machine (PM) in the Cloud computing environment. It is necessary to migrate the VMs from over utilized hosts to ensure the quality of service. Meanwhile the VMs loading on underutilized...
With the rapid development of SOA technology, the instability of the distributed Web services has become a hot research topic. The survivability of Web system at a certain period of time is an important and useful indicator for making an appropriate adjustment dynamically to ensure the system runs best while the runtime environment or requirements are changed. However, most researchers only focus...
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