Method and apparatus for forwarding data packet in time-triggered network

A technology of time-triggered and forwarding devices, applied in data switching networks, digital transmission systems, time-division multiplexing systems, etc. Design complexity, reduce time synchronization delay, and improve the effect of synchronization accuracy

Active Publication Date: 2017-06-13
UNIV OF ELECTRONIC SCI & TECH OF CHINA +1
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  • Abstract
  • Description
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Problems solved by technology

This implementation is relatively complex and can only achieve sub-microsecond (theoretically) synchronization accuracy
[0005] In the pri

Method used

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  • Method and apparatus for forwarding data packet in time-triggered network
  • Method and apparatus for forwarding data packet in time-triggered network
  • Method and apparatus for forwarding data packet in time-triggered network

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Embodiment

[0038] Such as Figures 1 to 8 As shown, the forwarding device of data packet in a kind of time-triggered network of the present invention comprises input module, output module, PCI module and switching module, and wherein input module comprises clock synchronization module, frame analysis module, wherein: PCI module: mainly responsible for The input and output of the FC switch, the switching part and the software perform frame interaction and register connection, including controlling the data channel when the upper layer software configures the time routing forwarding table; clock synchronization module: used to complete the following nodes and switches after the system is powered on The time synchronization between the primitives is to obtain the time slot forwarding table of each port; the frame analysis module: it is used to analyze the input TT frame and non-TT frame, and then transmit it to the switching module. The frame analysis module includes a time forwarding search...

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Abstract

The invention discloses a method and apparatus for forwarding a data packet in a time-triggered network. The method comprises the following steps: firstly, calculating a time routing forwarding table according to service flow and a topological structure of the network, configuring the time routing forwarding table in a switch, when the data packet arrives, inquiring the time routing forwarding table according to an HASH operation result of a feature field in the data packet to obtain an allowable arrival time slot of the data packet and an output port number of the data packet, comparing the arrival time slot with the allowable arrival time slot of the data packet, forwarding the data packet if the arrival time slot satisfies the allowable arrival time slot, and otherwise, discarding the data packet. Compared with the prior art, the method and apparatus disclosed by the invention have the advantages of reducing the design complexity of the switch of the time-triggered network, realizing error tolerance of the network and reducing the forwarding delay of the data packet, the method and apparatus can be applied to optical fiber channel networks, Ethernet and other scenes, the nodes of the network have a communication time having time synchronization, no conflict, low delay and certainty, and the demands of aerospace, medical technology , rail transit, automobile and other fields for high-speed, real-time and fault-tolerant communication applications can be satisfied.

Description

technical field [0001] The invention relates to the field of processing and forwarding of large-capacity real-time data in an avionics network, in particular to a data packet forwarding method and device in a time-triggered network. Background technique [0002] The time-triggered network can allocate non-conflicting time slots for data frames that may compete for physical links, ensuring the real-time performance of the network, while the avionics network has high requirements for real-time performance and reliability. Combining the real-time, deterministic, and fault-tolerant capabilities of time-triggered network transmission with the avionics network can meet the needs of industrial real-time communication. Since the time-triggered network consists of at least one switch, in order to ensure the strong real-time characteristics of the time-triggered switch, it is necessary to optimize the time-triggered data packet forwarding method and the time synchronization method. ...

Claims

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Application Information

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IPC IPC(8): H04L12/937H04L12/931H04J3/06
CPCH04J3/0638H04L49/254H04L49/357
Inventor 涂晓东蒋傅礼吴晓凡孟中楼谢军陈昌祯
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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