Method for sending data frame of TTP format at TTE sending end

Abstract

The invention discloses a method for sending a data frame of a TTP (Time-Triggered Protocol) format at a TTE (Time-Triggered Ethernet) sending end. The method comprises the following steps: step 1), performing split judgment on TTE message flow to be sent, and if the length of the TTE message flow is greater than the maximum message load of TTP configuration, executing step 2); otherwise, directly packaging the TTE message flow into a TTP non-fragmented format to be transmitted by a TTP bus; and step 2) sequentially reading application messages from the TTE message flow according to the maximum message load of TTP fragment frames, packaging the TTP fragment frames and transmitting the TTP fragment frames via the TTP bus. The method realizes a network communication connection function between the gigabit bandwidth TTE bus serving as an airborne backbone network and the 25-mega bandwidth TTP bus serving as an airborne branch network, and realizes a time-triggered architecture-based real unified network of an avionics system.

Description

technical field [0001] The invention belongs to the technical field of airborne bus communication in an avionics system, in particular to a design method for high-efficiency conversion of Ethernet and time-triggered protocols under a time-triggered communication framework. Background technique [0002] With the increasing demand of avionics systems for distributed communication applications with different safety criticality and real-time characteristics, the traditional network using event-based communication mechanism cannot control the delay and jitter caused by transmission competition, and cannot meet the needs of different communication systems. Application of time safety critical requirements. The time-triggered communication mechanism based on clock synchronization provides an opportunity to improve the determinism and real-time performance of the airborne bus. Both time-triggered Ethernet (TTE) and time-triggered protocol bus (TTP) belong to the aviation airborne bus...

AI Technical Summary

Problems solved by technology

The branch network using ARINC 429 in the traditional network architecture only has a bandwidth of 1Mbps, resulting in low data transmission efficiency after protocol conversion; at the same time, the frame length of the bus transmission is 4 bytes, except for the frame identification and check digit information, each The amount of effective information carried by the frame is very limited, resulting in a large delay in data transmission across the network, resulting in poor communication certainty and real-time performance; this protocol conversion method leads to low software integration, low operating efficiency and network transmission efficiency

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