Subway comprehensive monitoring system synchronous communication method based on multi-connection primary-secondary redundancy

Abstract

The invention relates to a subway comprehensive monitoring system synchronous communication method based on multi-connection primary-secondary redundancy. In single / dual-channel multi-connection segmented data transmission, a program establishes a plurality of software channel connections at two communication ends by using redundant hardware resources of a server and a physical channel; massive monitoring data points are partitioned into small blocks according to logic data; every two software channels are taken as one logical communication unit which is responsible for management and communication of one data block; and interference among the logical communication units is avoided. In single-data-block redundant dual-connection transmission, a single logical data block is taken as a basic unit; two effective communication connections are established simultaneously between two communication parties on the basis of 1 / 2 of an available hardware communication channel; data are monitored through one transmission connection, and the other communication connection keeps in a standby state; when the connection used for transmitting the monitoring data fails due to a communication failure, the other connection substitutes the original connection through rapid switching to transmit the data; the failed connection is turned off; and reestablishment of the connection is performed regularly by trial on an original communication channel until success.

Description

technical field [0001] The invention relates to a comprehensive subway monitoring system, in particular to a synchronous communication method for a subway comprehensive monitoring system based on multi-connection active and standby redundancy. Background technique [0002] The subway comprehensive monitoring system is a large-function information system. Through the integration and interconnection of related systems, it connects the scattered automation systems into an organic whole and provides a unified platform for the subway. [0003] In the current field of subway automation, the subway integrated monitoring system (ISCS) is getting more and more widely used. The integrated monitoring system can provide a platform for information exchange and resource sharing. Its design uses network computer products with good versatility, compliance with international standards or industry standards, and high reliability, such as network switches, servers, and industrial computers to ...

AI Technical Summary

Problems solved by technology

At present, most of the communication programs for comprehensive monitoring still use a single-channel single-connection or dual-channel dual-connection communication framework. This communication framework has obvious hidden dangers, which is not conducive to ensuring real-time synchronization of system data.

[0006] For interconnected systems, especially central interconnected systems (subsystems and ISCS only have interfaces at the center, and all data are transmitted to integrated monitoring through only one or at most two physical channels) and complex systems, a complete subsystem real-time data It means a large amount of data (tens of thousands of real-time monitoring points or even more), and it will take a long time to initially transmit hundreds of thousands of points of data (initial synchronization). Once there are many telemetry points in the data (data frequently jump change), there will be a large amount of changed data waiting to be transmitted, and the initial synchronization process has not yet ended. Over time, the amount of data that needs to be synchronized in the queue waiting for transmission is getting larger and larger, and some old changed data of some data points have not yet been sent Going out, a new change occurs again, which will not only cause the real-time failure of system data, but also cause data loss (program transmission memory queue overflow), and even the situation of program crash and communication interruption