Method and communication system for data exchanging data...

Details Method and communication system for data exchanging data... Method and communication system for data exchanging data...

2007-08-21

2007-08-21

Meky, Moustafa (Department: 2157)

Electrical computers and digital processing systems: multicomput

Computer conferencing

Priority based messaging

C709S232000, C709S253000, C370S395420

Reexamination Certificate

active

10451558

ABSTRACT:
The present invention provides a method and a communications system for the exchange of data between at least two users who are in contact with one another using a bus system. The data are included in messages which are transmitted by users over the bus system. A specifiable priority is assigned to each message. In order to achieve, in the normal case, a high probability of a short latency period (t) of a message to be transmitted, and to be able to guarantee, in the worst case, a maximum latency period (tmax), it is provided that the priorities assigned to the messages be dynamically modified during the operation of bus system. Preferably, the set of all messages is subdivided into equivalence classes, and a priority is assigned to each equivalence class. During the operation of the bus system, the priorities of the messages are dynamically modified within an equivalence class, and the priorities of the equivalence classes are dynamically modified.

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M. A. Livani, J. Kaiser, W. J. Jia: “Scheduling Hard and Soft Real-Time Communication in the Controller Area Network” [Online] 1998, 23rdIFAC/IFIP Workshop on Real Time Programming 23rdIFAC/IFIP Workshop on Real Time Programming XP002235284 found at Internet: <URL: http://www.informatik.uni-ulm.de/rs/projek te/core/> [found on Mar. 19, 2003] paragraph [0004].
M. A. Livani, J. Kaiser: “EDF Consensus on CAN Bus Access for Dynamic Real-Time Applications” José Rolim (Ed.): Lexture Notes in Computer Science, [Online] Nr. 1388, 1998, pp. 1088-1097, XP002235283 found at Internet: <URL:http://www.informatik.uni-ulm.de/rs/p rojekte/core/> [found on Mar. 19, 2003] paragraphs [0004], [0005].

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