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Method of transmitting messages

A technology of message and transmission protocol, applied in the field of message transmission, which can solve problems such as blocking messages

Inactive Publication Date: 2008-11-12
NXP BV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] However, especially in the dynamic segment of the FlexRay protocol, there may be blocking of messages, because the messages entering the FIFO buffer memory of the transmission path are processed sequentially, so there is always only one specific time slot available, which means Lower priority messages entering buffer memory ahead of higher priority messages may block higher priority messages until a time slot for lower priority messages opens

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Embodiment Construction

[0031] figure 1 The illustrated embodiment is a network comprising 5 nodes A, B, C, D and E and a channel 1 for transmitting messages between the nodes A, B, C, D and E, for example in automotive engineering for A network for communication between the various components of a motor vehicle. In principle, two channels or other channel topologies are also possible.

[0032] The pattern of message transmission over time can be seen from the diagram in Figure 2. FlexRay is basically divided into static segments SID1 to SID3 and dynamic segments SID4 to SID6. Regardless of the number m of time slots, the number of messages exchanged is n, under normal circumstances n>m, for example, select m=6, n=15. For simplicity of illustration, assume that all messages are of the same length, and that the dynamic segment can support 2 messages per cycle.

[0033] There is a fixed correlation between MID1-3 and SID1-3 in the static segment, and it is assumed that there is no such fixed correl...

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Abstract

Provided is a method of transmitting messages, using a transmission protocol having time-slots, which allows the messages to be transmitted in a flexible way, it is proposed that each message has a message identifier assigned to it, that the messages are placed in order in a queue, and that the queue has a set of slot identifiers assigned to it.

Description

technical field [0001] The invention relates to a method of transmitting messages using a transmission protocol with time slots. Background technique [0002] In a communication system generally composed of a plurality of nodes arranged in a network, messages are exchanged between the nodes so that information can be transferred. Such a communication system can be used, for example, to control complex technical arrangements with multiple sensors, actuators etc., preferably from a central control unit. Such systems are used in particular in automotive engineering, for example, in order to be able to direct signals from acceleration sensors to a central control unit. If the acceleration sensor senses that the acceleration limit value has been exceeded, a signal indicative of this sensing is transmitted to the control unit, which then triggers the airbag. In this case, it is especially necessary to transmit safety-relevant messages or information reliably. Access to the tran...

Claims

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Application Information

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IPC IPC(8): H04L12/56
CPCH04L49/9047H04L49/90H04L47/10H04L51/21
Inventor 彼得·富尔曼
Owner NXP BV
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