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This paper presents an analytical model to study the performance of cloud applications using message queueing as a service (MaaS). MaaS is a cloud service which allows the development departments to focus on delivering business and computing applications without being concerned with the underlying message queueing infrastructure to be scalable, secure, and reliable. Estimating the service delay (prior...
The emergence of power as a first-class design constraint has fueled the proposal of a growing number of run-time power optimizations. Many of these optimizations trade-off power saving opportunity for a variable performance loss which depends on application characteristics and program phase. Furthermore, the potential benefits of these optimizations are sometimes non-additive, and it can be difficult...
A multi-channel network that uses a separate channel for control packets exchange in order to coordinate the data communication, is studied in this paper. We assume that the parallel data channels are divided into two groups, while an one to one correspondence among the data channels of the two groups is considered. This assumption is exploited by the proposed asynchronous transmission MAC protocol...
The main goal of this study is the analytical modeling of the packets rejection at destination due to the receiver collisions in WDM LANs. Especially, an efficient synchronous transmission WDMA protocol suitable for passive star topology is proposed that takes under account the collisions over the WDM channels, while it considers the receiver collisions phenomenon. In each station, a set of parallel...
Streaming applications are often modeled with Synchronous data flow graphs (SDFGs). A proper analysis of the models is helpful to predict the performance of a system. In this paper, we focus on the throughput analysis of memory-constrained SDFGs (MC SDFGs), which needs to choose a memory abstraction that decides when the space of consumed data is released and when the required space is claimed. Di↵erent...
With the congestion and scarcity of available spectrum resources, spectrum sharing between long-term evolution (LTE) and the IEEE 802.11 (aka. WLAN) systems is an ongoing research topic. Considering the LTE license assisted access (LAA) with the listen before talk (LBT) procedure, recent research efforts try to evaluate the performance in several LTE-LBT and WLAN coexistence scenarios. However, the...
In this paper, an accurate analytical performance study of a multi-channel network is derived, based on the probability theory. Especially, we mathematically model the performance of a multi-channel network, such as a wireless or an optical WDM network, assuming both the collisions over the multiple channels and the destination conflicts. The receiver collisions phenomenon is extensively studied,...
Wireless Sensor Networks (WSNs) play as a key important role in Internet of things era, they provide a lot of utilized applications deployed in quite different environments. Beside its clear benefits, a WSN has to face with several challenges which come from a practical environments such as interference phenomenon, energy limitation, transmission constraints or mobility model. Especially, several...
A port-Hamiltonian model of the traffic dynamics for a wireless communication system was developed in our previous work. The developed model takes into account various wireless communication aspects: such as a wireless path loss model, the characteristics of a wireless communication system, mac layer and network layer protocols, antenna design, latencies, buffer dynamics, acknowledgment rate and so...
A Wireless Body Area Network (WBAN) is a network of wireless sensors and medical equipments located inside or outside the human body for collecting biological signals for various medical and non-medical applications. IEEE 802.15.6 was developed as the standard for WBAN where nodes can access the channel via contention access or contention free access. In this paper, only contention access is considered...
The impact of various mobility models like flag mobility and random waypoint mobility models on QoS issues in MANET and WSN are studied. The performance of the MANET and WSN are evaluated for the mobility models using QualNet 6.1 simulator. Performance is concerned with the Average End to End delay, Jitter, Throughput and also total messages received. which are studied for the various mobility models,...
In recent years, video traffic has been increasing due to the huge demands of video streaming services. Peer-to-peer (P2P) video streaming services (P2PTV) have attracted attention as a solution to decrease the server load because P2P communication can distribute the video data to peers. However, the random peer selection mechanisms of P2PTV conduce to the worldwide spread of P2PTV traffic, and thus...
In the past few years, the telecommunications field experienced a rapid evolution on two main grounds: Multiple mobile network interface terminals, and mobile radio technologies. The needs of the users in terms of flow and mobility are in constant increase, making it necessary to develop a new generation of networks. The latter would be a heterogeneous wireless environment in which different access...
In recent years, a significant amount of research has been conducted to explore the benefits of network coding in different scenarios, from both theoretical and simulation perspectives. In this paper, we utilize queueing theory to propose an analytical framework for bidirectional unicast flows in multi-hop wireless mesh networks, and study throughput of inter-flow network coding. We analytically determine...
In this paper, an analytical framework is developed to study the performance of opportunistic channel bonding in IEEE 802.11 WLANs. Specifically, we consider a WLAN operating on multiple channels shared by both legacy users and IEEE 802.11ac users with channel bonding capability. By capturing the opportunistic channel bonding from the IEEE 802.11ac users in the primary channel and the random access...
In this paper, we present an efficient medium access control (MAC) protocol based on IEEE 802.11 DCF, which minimizes the unfairness problem of two way vehicle ad hoc networks. Geographically highly dynamic topology in vehicle ad hoc networks lead to unfairness problem. Unfairness problem has two aspects: higher velocity vehicles cannot transmit a minimum number of packets and lower velocity vehicles...
An analytic model on dynamic sensitivity control (DSC) for 802.11 infrastructure up-link communication is proposed in this paper. The stochastic geometry approach is used where the locations of stations (STAs) and access points (APs) are modelled with two Poisson point processes (PPP) with density lambda-µ and lambda-µ a respectively. Using the amended Martern hard-core thinning...
We consider a horizontal traffic queue (HTQ) on a periodic road segment, where vehicles arrive according to a spatio-temporal Poisson process, and depart after traveling a distance that is sampled independently and identically from a spatial distribution. When inside the queue, the motion of vehicles is governed by a car following model. We consider safe first and second order car following models...
In this paper, we investigate the influence of intra-and inter-cell mobility of users on performance of 4G/5G cellular networks, such as LTE and LTE-A. To this end, we develop a multi-class PS queue model that captures mobility of users between zones of a cell and between cells, through a simple mobility model, that is decoupled from the cell model itself, enabling to directly apply the approach to...
Internet of Things (IoTs) is gaining increasing significance due to real-time communication and decision making capabilities of sensors integrated into everyday objects. Predicting performance in IoTs is critical for detecting performance bottlenecks, designing optimal sleep/wake-up schedules and application-aware performance tuning. However, performance prediction becomes a significant challenge...
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