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Congestion control has become a research focus with the development of network communication technology. Random early detection (RED) for queue management techniques is the most effective method. However, RED is particularly sensitive to the traffic load and the parameters of the scheme itself. When the traffic load is low, the bandwidth is underutilized, whereas when the traffic load is high, the...
The increasing multimedia traffic and limited spectrum resource in Geosynchronous (GEO) satellite systems starve for an efficient Call Admission Control (CAC) scheme, which aims to provide acceptable Quality of Service (Qos) to massive users, however, the throughput may not be guaranteed. In order to maximize the total throughput of communication system, a dynamic CAC scheme, named Maximizing Throughput...
The new type of the mobile Ad-hoc network, which is called Vehicular Ad-hoc Network (VANET) is creating a rich environment for research. It considered being one of the projects of the Internet of Things (IoT). IoT can be utilized in employing VANET technology to alleviate roads congestion in real time. It has a great impact on the society in general such as to reduce travel time, minimize the fuel...
This letter presents a Flow-Level Extension to OMNeT++ (FLEO) that allows a discrete event simulator to operate on flows of traffic, and so simulate larger networks for longer periods of time for a given set of computation and memory resources compared with packet-based simulation. FLEO simulations of link utilization are accurate to within 0.2% of a packet-based simulation, yet run 30 to 90 times...
We present a simulation-based study of the impacts of channel switching overhead on the performance of multicast in multi-channel multi-radio wireless mesh networks (MCMR WMNs). We study how channel switching overhead affects the performance metrics such as packet delivery ratio, throughput, end-to-end delay, and delay jitter of a multicast session.
With the development of MEMS (Micro-electromechanical Systems), the wireless sensor networks (WSNs) have become an important communicating method for intelligent transportation application. Mathematics modeling, as an effective quantitative analysis method, is very important for conducting intelligent transportation performance research when WSNs are applied. Based on the channel contention mechanism...
Following the explosion of Internet-enabled mobile devices and mobile services, users tend to expect network connectivity everywhere they go and at any time. In anticipation of these higher connectivity expectations and requirements especially for vehicular communication, several technologies like WiMAX, cellular networks (i.e., 3G/4G) and wireless mesh networks have been developed. While cellular...
This paper presents an analytical model for analyzing the performance of the TDMA-based distributed reservation protocol for wireless multi-hop ad hoc networks. A novel three-way handshake process is presented which considers the hold-off and competition process before the transmission of scheduling messages. An explicit expression of expectation of the average delay of the three-way handshake process...
Sharing Transmission Opportunity period (TXOP) technique is recently defined by IEEE 802.11ac to allow simultaneous downlink transmissions. In this paper, we focus on the basis of this technique and the behavior of the access point (AP) to manage the multi-user access. We discuss the different steps required to allow simultaneous downlink transmissions. Based on simulation results, we prove that TXOP...
Energy efficiency is a very important requirement in designing a MAC protocol for wireless sensor networks (WSNs) using battery-operated sensor nodes. We proposed a new energy-efficient MAC protocol, RIX-MAC, based on asynchronous duty cycling and receiver-initiated scheme. In this paper, we analyze the performance such as throughput, delay, and energy consumption of RIX-MAC with modeling and simulation...
As a breakthrough technology under 3GPP, LTE has attracted attention worldwide. Main features include enhanced peak data rates, lower delay, increased cell edge throughput. For an LTE system, serving a large number of users requires an efficient RRA algorithm which has not been standardized for the system and is still an open end for development. Researchers have proposed various algorithms some of...
High Altitude Platform Station (HAPS) is one of a new infrastructure in telecommunication, which is like airship or aircraft that is placed on the stratosphere. The distance of platform is about 17–22 km from the earth's surface. However, in its application HAPS that placed on the stratosphere layer of air is affected by the wind gusting. Position HAPS can change from the normal state that is called...
To overcome the weak point that frames in original k-round elimination contention (k-EC) scheme do not have traffic differentiation, we propose a priority scheme with two access categories based on first-round-bye (FRB). High priority stations in this scheme carry out a round bye in the first round, while low priority stations contend. Saturation throughputs and saturation delays of the two priority...
Because of the importance of underwater acoustic network MAC layer protocol, feasibility and simulation analysis of underwater acoustic network MAC layer protocol attack were carried out in this article. The principle of underwater acoustic network MAC layer protocol attack was introduced, simulation analysis of performance of attacking methods, including modification of back off time and NAV values,...
Network-on-Chip (NoC) is an emerging solution for interconnect problems for both ASICs and FPGAs nowadays. In this paper, we deliver a comparative review between ASIC-based and FPGA-based NoCs. An exploration of design tradeoffs for different NoC design parameters is also given. We also propose an evaluation methodology and design recommendations for various design parameters for both ASIC and FPGA...
In this paper, we propose a Group-Oriented QoS-Enhanced proportional fair (GQPF) scheduling algorithm, which aims at maximizing QoS throughput while still retaining fairness as well as maximizing system throughput in downlink OFDMA networks. GQPF proposes a Group-Oriented QoS-enhanced PF-based utility function for multi-channel OFDMA networks. We demonstrate via extensive simulation results, that...
In this paper, we investigate the performance of HWMP, OLSR and DD protocols in a VANET crossroad scenario. The mobility patterns of vehicles are generated by means of SUMO (Simulation of Urban Mobility) and as communication protocol simulator is used NS3 (Network Simulator 3). For the simulations, we used IEEE 802.11p standard, Two Ray Ground Propagation Loss Model and sent multiple CBR flows over...
The packet scheduling problem has been deeply studied for lot of years by researchers in the computer science and telecommunications fields as an important solution that decides the order in which packets are sent over a link in order to provide QoS on a network. Recently, the packet scheduling has become again a challenging topic due to the massive use of wireless technologies (e.g. WiFi, LTE, 4G/5G),...
Wireless Sensor Network (WSN) is consisting of independent and distributed sensors to monitor physical or environmental conditions, such as temperature, sound, pressure, etc. Routing protocols represent an essential aspect of the performance of mobile wireless networks. This paper presents a comparative analysis between several routing algorithms and their impact on the performance of WSN. The performance...
The design of wireless embedded systems needs their efficient and realistic simulation to verify that requirements are met. The reproduction of communication behavior is crucial to assess the performance of hardware and software components, e.g., dependability and energy consumption. This work presents and discusses different levels of abstraction for the simulation of the communication behavior....
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