A Frame Packing Framework for Control Systems
Institution: | KTH Royal Institute of Technology |
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Department: | |
Year: | 2014 |
Keywords: | Natural Sciences; Computer and Information Science; Naturvetenskap; Data- och informationsvetenskap; Civilingenjörsexamen - Informationsteknik; Master of Science in Engineering - Information and Communication Technology; Electronic- and Computer Systems; Elektronik- och datorsystem |
Record ID: | 1359407 |
Full text PDF: | http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-147614 |
Ethernet has become more and more popular in the industrial world. The full duplex standard and the arrival of switches have made this protocol competitive for real-time purposes. In automation systems, a lot of energy is invested to integrate technologies using Ethernet into control systems. Since Ethernet frames have an important payload, and control signals a very small size, monopolizing an Ethernet frame for a single signal is quite inefficient. A solution to reduce this overhead is to allow sending several signals into the same Ethernet frame. This problem, close to the bin packing problem, is NP-hard. With signals having end-to-end deadlines to respect and different periods and release times, this problem becomes even more complex. We propose here to design a communication framework realizing such a frame packing. The challenge is to generate near-optimal solutions in terms of bandwidth utilization while meeting the different real-time constraints related to automation control systems.