Time-triggered transmission method supporting burst real-time data

Abstract

The invention discloses a time-triggered transmission method supporting burst real-time data, and aims to provide a time-triggered transmission method which is high in universality, compatible with common time-triggered transmission and capable of improving the transmission capacity. The method is realized through the following technical scheme: in a switched full duplex network, nodes with strongreal-time data packet and common time triggering data packet transmission are planned; a preemption protection time slot is allocated to each node time slot; the network transmission protocol modulefirstly sends data to be sent to a sending cache, the preemptive time triggering scheduling module preferentially sends out a strong real-time data packet, and the common time triggering data is buffered and waited, delayed for a certain time and then sent; when a data packet is routed and forwarded through a switch in a network, the network switch preferentially forwards a strong real-time data packet, a received data distribution module distributes the received data packet, and the strong real-time data packet is preferentially sent to an upper-layer protocol and is processed by an upper-layer application.

Description

technical field [0001] The invention relates to an aviation airborne switching full-duplex transmission network, which can take into account a deterministic transmission scheme for real-time transmission of burst data. In particular, it supports burst real-time data transmission methods in time-triggered transmission networks. Background technique [0002] CAN (Controller Area Network) bus, as a field bus for real-time control applications, is widely used in the field of industrial control due to its short-frame data structure, multi-transmission working mode, long communication distance, strong anti-interference ability, bit arbitration, and low price. Has been widely used. As the control system has more and more functions, the network is more and more complex, and the data transmission density is also increasing. However, the bandwidth of the CAN bus is low, and it is difficult to gain advantages in applications that require large amounts of data exchange. Some informati...

AI Technical Summary

Problems solved by technology

Compared with the bus-type network, the switched network has no data conflict problem, and has a higher network bandwidth capacity than the traditional CAN bus, and the data transmission delay is relatively lower, but there are also certain limitations: the storage of the switch The forwarding mechanism makes the transmission delay non-deterministic

Although the time-triggered transmission technology improves the time certainty of the network, each network node only transmits data in the assigned time slot, but cannot transmit data through the network at other times, and must wait for the transmission time slot of the next bus cycle

The maximum transmission delay of this transmission method is deterministic, which can meet the periodic business data transmission scenario with low requirements on the maximum transmission delay, but it cannot meet the control information with high real-time requirements and random bursts. transmission scenarios, such as the transmission of sudden strong real-time control commands in airborne applications, etc., the data volume of such data packets is usually low, but the requirements for data transmission delay are very high

In order to ensure the real-time and reliability of the transmission, the transmission of this type of data is usually implemented by an additional point-to-point communication interface, which increases the hardware complexity of the system to a certain extent.

[0006] Time-triggered transmission makes data transmission deterministic, but each node can only transmit data within the allocated time slot, and after missing the allocated time slot, it needs to wait for the next cycle time slot, which cannot meet the burst in some application scenarios Strong real-time data transmission requirements

In a system with strict real-time requirements, the transmission delay of information must be guaranteed to be less than its deadline. Once the deadline is exceeded, the information will be considered invalid, and in some cases it will lead to serious consequences.

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