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Study on the Data Transmission Time and QoS Based on the RTnet Real-time Protocol

Author: Zhang
Tutor: XuFuYong
School: Lanzhou University
Course: Radio Physics
Keywords: Real-time systems Real-time protocol QoS RTnet Multi-objective planning
CLC: TN915
Type: Master's thesis
Year: 2008
Downloads: 82
Quote: 1
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Abstract


The growing popularity of network applications, control systems, and factory automation field increasingly demanding high QoS performance of the network, but traditional Ethernet because of the uncertainty of the data transmission, and therefore can not provide better network quality of service ( QoS). Therefore, traditional Ethernet can not be directly applied to the field of industrial control. Reasonable real-time Ethernet as well as the emergence of the real-time protocol to solve these problems, of great significance to improve the real-time nature of the network and improve the utilization of network resources and to improve the stability of the network. However, more research is currently concentrated in the field of network performance optimization, and performance optimization is only concerned about the impact of some aspects of the real-time performance, and there is no specific research for the entire real-time network overall, the mathematical modeling of the agreement itself, and quantitative research had not been seen in the literature. In this paper, based on the multi-objective planning algorithm RTnet multi-constrained QoS routing analysis, affect QoS routing performance parameters, such as delay, delay jitter measurement show that the multi-objective programming algorithm can improve the performance of The RTnet multi-constrained QoS routing . At the same time, the paper-based RTnet describes the working mechanism of the real-time network, specifically demonstrated how traditional Ethernet made improvements from the field of real-time network protocols as well as real-time reliability optimization. Detailed analysis of some specific parameters that affect network quality of service (QoS) in the agreement, such as transmission delay, delay jitter, and the first time regression analysis applied to a multi-constrained QoS issues in real-time systems, the actual measured parameter values establish affect QoS performance parameters with time division multiple access (TDMA) method in the cycle as well as the time slot between the linear relationship model. On standard Ethernet QoS performance problems, discuss the impact on the stability of real-time Ethernet network load and node load two different parameter change of network transmission delay, delay jitter difference of these two analysis of the parameters can be drawn, a small load of real-time Ethernet the various load can not affect the performance of the network, which also show that the real-time Ethernet RTnet real-time communication protocol can successfully solve the QoS problems. Meanwhile, in the description of the network QoS problems, the conventional description parameter jitter difference is the arithmetic mean, in mathematics, it does not describe the degree of similarity of the first two sets of data as well as the stability of the data. Will describe the network QoS performance parameters jitter difference modify into variance variance to describe its performance, linked variance with the time slots in the TDMA method, transmission data size, the use of regression analysis of multivariate analysis model mathematical expression, verify whether the model parameters established in the regression analysis, the parameter values ??in the model is less than a set of parameters in the regression analysis, to prove that the model is set up. The results of this study to solve the real-time network systems widely used in a large number of complex QoS issues, such as the communication industry and part of the time most demanding industry and other industries, has important theoretical value and application prospect.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication network
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