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One of the limitations of using Service Oriented Architecture (SOA) in mission critical applications (like Air Traffic Control) is the ability to specify stringent Quality of Service (QoS) parameters for individual services. Even determining which Message Broker optimizations to utilize to achieve high QoS is difficult. This research is utilizing the concepts introduced by the Queuing Network Analyzer...
Traffic generation represents one of the main challenge in modeling and simulating the application and network load. In this work, we present a tool, called OpenAirInterface Traffic Generator (OTG), for the generation of realistic application traffic that can be used for testing and evaluating the performance of emerging networking architectures. In addition to the traffic of conventional applications,...
Network connectivity, as a fundamental issue in a wireless sensor network(WSN), has been receiving considerable attention during the past decade. Most works focused on how to maintain full connectivity while conserving network resources. However, full connectivity is actually a sufficient but not necessary condition for many WSNs to communicate and function successfully. In addition, full connectivity...
Next-generation passive optical network (PON) has been widely considered as a cost-effective broadband access technology. With the ever-increasing power saving concern, energy efficiency has been an important issue for its operations. In this paper, we present a novel sleep time sizing and scheduling framework that satisfies power efficient bandwidth allocation in PONs. We consider the downstream...
Carrier aggregation (CA) has been proposed as a key feature of the 4G cellular networks to achieve the very high data rates. It is known that the correlation between the subchannels, including both small- and large-scale fading, is critical in determining the performance gain we can obtain from the multicarrier transmission. However, due to the prohibitively high complexity and cost in simultaneously...
Recently the Effective Capacity of multi-user wireless scheduling has been analyzed based on large deviation principle. The users' queue length distribution bound of wireless scheduling algorithm such as round robin and rate maximum was discussed based on Effective Capacity analysis. But for Queue Length Based (QLB) Rate Maximum scheduling algorithm, the analysis result is only limited to system bound...
The estimation of time of flight (TOF) is fundamental to many ultrasonic-based techniques. This paper presents a novel method for estimating time delay of ultrasonic echoes based on vibration theory and signal processing methods. The method is inspired by the physical model of ultrasonic echoes that shows the rising edge of ultrasonic echoes depends on the damping factor of the vibration part of the...
Efficient link management is important for mesh networking. The links opened between neighbor STAs should be stable and ensure high probability of packet delivery. Various approaches of link management are usually compared by simulation. The core contribution of this paper is original link management efficiency criteria and an analytical model of decision-making process of link management in IEEE...
Sleep modes are important for user equipment to reduce power consumption or to reduce battery reloading. To keep the user equipment connected, it has to be activated for uplink or downlink data transfer which causes overhead and additional delay. Wireless or mobile equipment has to be monitored repeatedly for location updates. These classes of problems can be modeled by queuing systems with modified...
This paper demonstrates the effectiveness and robustness of amplifier finite gain bandwidth compensation within a wideband third order continuous time delta sigma modulator and the effects of process, mismatch and temperature on modulator stability. In many state of the art designs, GBW is kept safely above the sampling frequency of the modulator, which suffers a power penalty especially for high-speed...
A latency-hiding algorithm for the parallelization of large scale agent-based model simulations (ABMS) on parallel/distributed computing platform is proposed. The key idea of this algorithm is using redundant computations to hide communication latencies. An analytical model for this algorithm is presented to tell how to select R value to reach the best speedup. Compared to B+2R algorithm [1], theoretical...
This paper develops a simple analytical model based on a Markov chain that calculates saturation throughput and average packet delay for the IEEE802.11 Distributed Coordination Function (DCF) for network scenarios with voice and data stations. The analytical model is validated by comparing its results with simulation outcome. Based on the analytical model, a methodology that calculates voice capacity...
In communication networks data packets are often transmitted via multiple hops on certain destined source-destination paths. The topological structure of such a scenario can be modeled by multi-node tandem queueing networks, but the standard independence assumption of queueing theory does not hold, that is, modeling the packet processing times at the successive nodes as independent and identically...
The character of the input flow changes with an increasing amount of multimedia services. The most common classical stochastic models suppose an exponential distribution of interarrival times, i.e. the Poisson input flow. This paper shows the significant influence of probability distribution functions of interarrival times, such as the exponential, the hyper-exponential and the Erlang's of the order...
Performance analysis of network queuing model is very important due to delay and latency that may be caused by using inappropriate model. It also impacts the utilization and throughput of the network. Many network queuing models have been proposed to be used in the network such as Poisson distribution model and Exponential distribution model. The first step in using a suitable queuing model is to...
The delay sensitive industrial control applications like Industrial process control, Environmental control, Gas leakage monitoring, etc. in this a reliable communication between sensor and base station are highly essential. Wireless Sensor Networks (WSN) becomes an immensely popular technology in such application as it offers low latency and high energy-efficiency in message transmission. Life span...
This paper presents an original development methodology for the use of SystemC to compare two different networks at the system level. A single cluster of a single channel network based on CSMA and multi-channel network cluster based on non-overlapping channels available for each node have been developed. In both network configurations a noiseless (error-free) channels are used, since the focus in...
The impulse ultra-wideband (UWB) channels covering the frequency range from 2 to 10 GHz, it covers indoor residential, door office, outdoor, industrial, and open outdoor environments. UWB communications systems share the spectrum with other systems in an unlicensed manner. This has caused a strict spectral constraint. In order to discuss power spectrum distribution, it analyzed the channel modeling...
Carbon Nanotube (CNT) has become the promising candidate for replacing the traditional Copper (Cu) based interconnect systems in future technology nodes. This paper presents an analytical model for timing and crosstalk in the CNT based nano-interconnect systems. The proposed model is compared with SPICE and it is found that the proposed model is 100% accurate with respect to SPICE and in an average...
To confront and combat some of the issues in the administration and distribution of Islamic inheritance, Muslims have to look pass constitutional amendments and consider other alternatives as practical solutions to the problem of lengthy and costly claim procedures. Unveiling the uncertainties and confusion undergone by Muslims for so many years has provided the basis for our study to develop the...
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