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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
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • 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

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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 ) ...

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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

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Application Information

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IPC IPC(8): H04L12/40
CPCH04L12/40006
Inventor 王刚
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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