The invention discloses a virtual link-based time-triggered communication blended data sending scheduling method. A time slot calculation and time slot timer device module adopts a parallel timing and calculation structure to achieve calculation and generation of time slot sending signals of multiple TT communication virtual links and work of a time slot timer, and therefore the data load state of physical links can be monitored in real time only through two groups of signals; a sending scheduling control module fills ET data frames in the physical links more effectively through index comparison of the ET frames while sending of TT data frames is not influenced, and therefore the bandwidth utilization rate is increased; and a time-triggered communication virtual link configuration table and an event-triggered communication virtual link configuration table are arranged, and therefore in the sending process of the TT data frames and the ET data frames, the indexing mode is simple, and the data cache access efficiency is high.

Virtual link-based time-triggered communication blended data sending scheduling method

A method for transmitting real-time messages in a computer network (100), in particular real-time computer network, wherein said network comprises two or more computing nodes (21, 22, 23, 24, 25, 26) and one or more star couplers (1, 2, 3, 4), wherein said nodes are interconnected via at least one star coupler, wherein each node is connected to at least one star coupler via at least one of the communication links (50), and wherein the nodes exchange messages (M1, M2) with one another and with the at least one star coupler, and wherein star couplers, which are synchronized to a global time base (C), transmit a first non-empty set (SSET) of real-time messages according to a synchronized communication paradigm, and/or wherein computing nodes, which are synchronized to the global time base, transmit said first non-empty set of real-time messages according to the synchronized communication paradigm, wherein a star coupler, which is not synchronized to a global time base, and/or a computing node, which is not synchronized to a global time base, transmits a second non-empty subset (CSET) of said first non-empty subset of real-time messages according to an unsynchronized communication paradigm and stops the transmission of said second non-empty subset of real-time messages according to the synchronized communication paradigm.

Method to improve availability of real-time computer networks

The invention discloses an operating system framework triggered by time and event as well as a task scheduling method in order to solve the technical problem of poor real-time capability of existing system structure triggered by time. The technical scheme includes that the operating system framework triggered by time and event divides the kernel-task model into a task module triggered by time and a task module triggered by event according to different management and task scheduling. Hybrid tasks scheduling method is adopted, wherein the task module triggered by time plays a dominant role and mainly ensures the reliability and certainty of the system. The task module triggered by event works in the idle time of the task module triggered by time, which improves the system flexibility. Urgent and unexpected tasks are dealt with in the interruption time of the task module triggered by time, which improves the real-time capability of the system. According to the method, the flexibility, reliability and real-time capability of the whole system are improved.

Operating system framework triggered by time and event as well as task scheduling method

With the development of embedded technology, more and more security critical tasks appeared in embedded application fields, which requires higher real-time and reliability of the system. ARINC 653 standard proposed the concept of partition, and improves the security and reliability of the system in the system kernel aspect. Time-window and priority strategy are the primary methods in task scheduling, but there are many shortcomings in the traditional partition window time zoning. The smaller window requires higher switch frequency, the larger window will result unexpected time segments. In order to solve the problems above, this paper proposes a dynamic cycle execution time (DCET) scheduling algorithm. The algorithm can prevent task in low level key partition preempting the task in high level key partition. Make use of free time segments to execute the task, thus improve the efficiency of the system. At last, a partition environment was built by μC/OS-II on the ML507 development board, and the experimental result confirms the effectiveness of the algorithm.

Research on Security Critical Task Scheduling Algorithm Based on ARINC 653 Standard

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Operating system framework triggered by time and event as well as task scheduling method

Research on Security Critical Task Scheduling Algorithm Based on ARINC 653 Standard