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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....
In high bandwidth, low latency data center networks, when multiple data senders simultaneously communicate with a single receiver, namely in many-to-one communication pattern, the burst data overload the receiver's switch buffers, which leads to TCP throughput collapse. That is so-called TCP In cast problem. It has become a new hot research topic in recent years. And, many proposals have been put...
In the Long Term Evolution (LTE) system, there is limited on uplink average data rate the cell edge users for the power limitation and the inherent short Transmission Time Interval (TTI) length of the cell edge users. TTI bundling scheme was presented for the VoIP service in the LTE Release 8 specifications to solve the cell coverage problem. But the R8 TTI bundling is restricted to bundles of 4 TTIs,...
For the performance evaluation involving wireless mesh networks the concept of simulation is often used instead of measurements within a real environment. This is partly due to the lack of real-world testbeds but also caused by the unsteady nature of wireless mesh networks making it difficult to reproduce results. Typically, no real data is transmitted in simulations as for the calculation of network-related...
A four-node wireless network model is designed based on NS2 simulation platform software. The network performance, such as System delay, Packet loss rate, Throughput and other key indicators are simulated in this paper. By running of TCP and UDP protocols, we make the analysis and evaluation to network performance from different aspects, and then, associated parameters were compared graphically with...
In this paper we present a remote utility metering system based on ZigBee used to collect data from residential electricity, gas and water meters. In order to reduce the use of network resources and to evaluate the sensor network performance, a simulation study was carried out with two types of data related to electronic and non electronic metering devices. The study was conducted using a simulator...
One of the most important but neglected aspects of a simulation study is the proper design and analysis of simulation experiments. In this tutorial we give a state-of-the-art presentation of what the practitioner really needs to know to be successful. We will discuss how to choose the simulation run length, the warm-up-period duration (if any), and the required number of model replications (each using...
In order to study the system performance of tactical data link under the multiple nets communication mode in practice, based on NS-2 (Network Simulation version 2), taking Link-16 as an example, a design of the Link-16 data link with multiple nets structure model is made. And the data link with multiple nets is simulated. The simulation result is given. And the effect of multiple nets to packet transmission...
This paper proposes a heuristic algorithm for constructing improved broadcast schedules. With simple modifications to the well-known Broadcast Disks approach, the proposed technique provides increased performance. This is confirmed by simulation results.
In a single-cylinder gasoline engine for the study, made a simulation optimization method of engine valve timing. After the construction of a simulation model of the engine, the simulation results are compared with the data of engine bench test to verify the accuracy of the constructed model. For improving the engine power performance, valve timing optimization simulation to this model is carried...
Variations of process parameters have an important impact on reliability and yield in deep sub micron IC technologies. One methodology to estimate the influence of these effects on power and delay times at chip level is Monte Carlo Simulation, which can be very accurate but time consuming if applied to transistor-level models. We present an alternative approach, namely a statistical gate-level simulation...
In LTE, the control signaling required for scheduling and HARQ on the MAC layer is partly protected by cyclic redundancy checks (CRC) but no ARQ, or other error recovery mechanisms, are used. Therefore, errors occur with a certain probability and may or may not be detected. Errors in HARQ feedback and scheduling grants could cause underutilization of resources, longer delays, redundant retransmissions,...
Based on the model of assembling of multiple ON/OFF sources, a new implementation was designed to create self-similar traffic by using OPNET simulation software. It can generate self-similar network traffic effectively through some ameliorations of the data source module in OPNET. And using ldquovariance-timerdquo technology to verify the self-similar sequence generated by above method. Furthermore,...
In this study, a procedure was developed to help transportation professionals evaluate the impacts of U-turns on level of service of signalized intersections using two widely used simulation packages: Synchro and SimTraffic. Two parameters related to U-turns were calibrated based on field data. They are (1) the saturation flow rate for U-turn and left-turn mixed traffic stream; and (2) the turning...
Information delivery service(IDS) is an important part of Information Grid and with the expansion of network and users, Quality of Service(QoS) has been the basic requirement of IDS. The architecture of Content Delivery Network, the frame of Data Delivery Service and the property of Battle Formation(BF) are firstly analyzed and a battlefield information delivery model is put forward based on BF, which...
We evaluate a video server system that performs streaming transmissions of consumer generated video (CGV) files. The CGV files are placed in iSCSI (i.e., SCSI over TCP/IP) storages at each individual's home, and the iSCSI storages are connected to one video server on demand. Since iSCSI uses the TCP protocol, the network delay greatly affects the iSCSI throughput. Although iSCSI storages have different...
Embedded complex systems manufacturing becomes more and more a multidisciplinary problem. So complex systems, such as telecommunication systems, control systems, etc., must have a special simulation and validation process that mixes both analog and digital circuitry, collects all results from partials and specials simulations to be injected in behavioral models of all system components. Simulation...
Existing traffic flow modeling theory lacks of guidelines to construct traffic flow models from scratch. In addition, traffic flow models are mainly analyzed with computer simulation then computer programs are involved in the test of the model. Different methods have been proposed not just from traffic flow but for modeling in general, however, existing methods do not rely on iterative process, which...
This paper presents a reliability growth simulation test bed that is useful in examining the reliability growth of complex systems. It has many potential applications, including cost vs. reliability growth analyses and reliability growth program planning. The most significant application of the simulation though, is that it provides a method for examining the robustness of existing reliability growth...
Right turn plus U-turn or U-turn plus right turn (RT+UT or UT+RT) at intersection as an alternative to direct left turn (DLT) has been considered as an important access management. As simulation tool, VISSIM has been widely used in German and other countries. However, VISSIM has been calibrated based on the Germany traffic characteristics, It has limitation to applying to Chinapsilas traffic conditions...
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