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Systemy komunikacyjne na potrzeby zarządzania ogólnym ruchem lotniczym w polskiej przestrzeni powietrznej. Część II - Kierunki rozwoju

Kocot B.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

2013

nr 5

138--146

Omówiono kierunki rozwoju systemów komunikacyjnych wykorzystywanych na potrzeby zarządzania ogólnym ruchem lotniczym w polskiej przestrzeni powietrznej.

In this article there were discussed trends of development communication systems for the needs of general air traffic management in polish airspace.

Assignment of periods and priorities of messages and tasks in distributed control systems

Kim H.Y., Lee C.M., Jung M.S., Park H.S.

Systems Science

2001

Vol. 27, nr 2

61-72

This paper presents a task and message-based scheduling method to guarantee the given end-to-end constraints including precedence constraints, time constraints, and period and priority of task and message. The method is the integrated one considering both tasks executed in each node and messages transmitted via the network and is designed to apply to the general distributed control system that has multiple loops and a single loop has sensor nodes with multiple sensors, actuator nodes with multiple actuators, controller nodes with multiple tasks, and several types of constraints. The assigning method of the optimal period and priority of task and message is proposed, using the presented task and message-based scheduling method.

Quality of service at layered architecture of data communication systems.

Grzech A.

Systems : journal of transdisciplinary systems science

2000

Vol. 5, No. 1-2

113-130

Various classes of traffic generated by different applications expect and accept various quality of service levels, determining various amounts of required network resources. Limited network communication resources and different qualitative and quantitative traffic requirements naturally give reasons to differentiate the quality of offered network services. The acceptability of different quality of service in networks leads to better network resource utilisation and increased network customer satisfaction. The differentiation of quality of service offered to various traffic classes, i.e., to various applications is possible due to the layered and nested structure of distributed computer systems. Such a concept of services is based on the assumption that any communication task, formulated at the application level, might be decomposed into simpler communication tasks, while the latter might be transformed into proper data communication tasks relevant to particular layers of architecture. The different data communication tasks form sequences of activities. The activities correspond to well-defined functions available at different levels of the layered architecture, so the selection of functions ascribed to activities decides the quality of service.