Method for calculating data transmission reliability lower limit of FlexRay bus network

A technology of network data and calculation methods, applied in the fields of bus network, digital transmission system, transmission system, etc.

Inactive Publication Date: 2016-04-20
UNIV OF ELECTRONIC SCI & TECH OF CHINA
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, there is currently no c

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for calculating data transmission reliability lower limit of FlexRay bus network
  • Method for calculating data transmission reliability lower limit of FlexRay bus network
  • Method for calculating data transmission reliability lower limit of FlexRay bus network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. In this preferred embodiment, a node in the FlexRay network has a data message M, and its blocking time, sending delay and software system processing delay are respectively T b , T f and T s . According to the method of the present invention, the lower limit P of the transmission reliability of the message M can be calculated according to the following flow l M .

[0016] Step 1. According to the measurement results, determine the three random variables T that affect the message M b , T f and T s The variation intervals of the mean and variance of as well as

[0017] Step 2, according to the measurement result of this FlexRay network, determine T=T b +T f +T s The reference probability distribution density function f r .

[0018] f r ( f ) ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for calculating a data message transmission reliability lower limit of a FlexRay bus network with incomplete information. The method comprises the following steps: (1) determining corresponding change intervals, which are shown in the description, of respective mean values and variances of three variables, namely, blocking time T, transmission delay T<f> and software system processing delay T<s> of a data message in a source node according to measurement results of the three variables; (2) determining reference probability distribution f<T> of a sum T=T+T<f>+T<s> of the three delay variables T, T<f> and T<s>; (3) calculating maximum cross entropy R<max> of T=T+T<f>+T<s> and the corresponding reference probability distribution in uncertain intervals of the mean values and the variances of the three delay variables T, T<f> and T<s>; (4) determining a communication deadline W<m> according to a real-time requirement of the message in the FlexRay network, and further determining a message transmission reliability function; and (5) calculating a communication reliability lower limit P<l> of the message according to the message transmission reliability function. Through adoption of the method provided by the invention, communication reliability of different messages in one FlexRay network can be calculated rapidly and accurately, and a reliable basis is laid for the design of a FlexRay-based network control system.

Description

technical field [0001] The invention relates to the technical field of field bus network data transmission reliability, in particular to a method for calculating the lower limit of reliability of FlexRay network data communication. Background technique [0002] As we all know, the real-time performance of data packets in many fieldbus networks is a key factor for the stable operation of the entire network system. If the transmission delay of some data packets exceeds the specified deadline—that is, when the real-time requirements are not met, unpredictable errors may occur in the system. In this sense, the transmission reliability of each data message in a bus network can be described by its probability of meeting real-time requirements. That is to say, the higher the probability that a data message meets the real-time requirement, the higher its transmission reliability is, and vice versa. Due to the significance of the reliability of data message transmission, it has alw...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H04L12/40
CPCH04L12/40006
Inventor 王刚
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap