Real-time assurance switched interconnection buffer capacity determining method

Abstract

The invention relates to a real-time assurance switched interconnection buffer capacity determining method. Aiming at the condition of the deficiency of the buffer capacity determining technology of an AFDX (Avionics Full Duplex Switched Ethernet) switch under hard real-time assurance, basic parameters required to be determined for carrying out packet scheduling by applying load matching in the switch are pointed out through establishing a message model, a switch queue equivalent structure model, a packet scheduling and buffering model and message real-time scheduling conditions and determining key parameters according to a switch message scheduling rule of an AFDX protocol, the relation between packet scheduling and incoming line and outgoing line queue buffer capacity is determined on the basis of the basic parameters, and the determining method for the incoming line and outgoing line queue buffer capacity in the AFDX switch under the hard real-time condition is disclosed. The method can assure the hard real-time demand of real-time message flow, assures that the real-time message flow can not overflow and simultaneously reduces capacity expenditure through reasonably setting the buffer capacity. The method is simple and easy to apply and has strong repeatability.

Description

technical field [0001] Aiming at the key tasks of aerospace safety, the invention proposes a buffer capacity determination method for ensuring message transmission delay for the switch buffer capacity in the integrated interconnection technology of platform electronic systems, which belongs to the technical field of interconnection of integrated aerospace electronic systems. Background technique [0002] With the further improvement of aerospace mission requirements (high-performance processing, high interface bandwidth, strong real-time performance, high reliability, etc.), the electronic interconnection technology and system architecture of aerospace vehicles have experienced a transformation from separate, combined to integrated. development process. Avionics Full Duplex Switched Ethernet (AFDX), as one of the supporting interconnection technologies of integrated systems, has higher reliability, anti-harsh environment adaptability and definite real-time performance, and h...

AI Technical Summary

Problems solved by technology

Existing data record that an analytical model has been established for FDDI LAN and FC-AL ring network, which provides useful reference for determining the conditions of real-time transmission and overflow of messages, but it is aimed at shared media network, and there is no research involving switched network

Some people proposed to carry out the probabilistic research on the buffer overflow of AFDX network nodes based on the random network calculus (Network Caculus) method, but did not explore the quantitative relationship between the buffer capacity of the switch and the message parameters under strong real-time conditions.

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