An efficient bandwidth management scheme for a hard real-time fuzzy control system based on the wireless LAN

Authors:
Junghoon Lee;Mikyung Kang;Yongmoon Jin;Hanil Kim;Jinhwan Kim
Affiliations:
Cheju National University;Cheju National University;Cheju National University;Cheju National University;Hansung University
Venue:
RSFDGrC'05 Proceedings of the 10th international conference on Rough Sets, Fuzzy Sets, Data Mining, and Granular Computing - Volume Part II
Year:
2005

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Abstract

This paper proposes and analyzes bandwidth allocation and reclaiming schemes on wireless media to enhance the timeliness of the real-time messages and accordingly the correctness of fuzzy control decision. Bandwidth allocation scheme generates efficient round robin polling schedule represented as a capacity vector by directly considering the deferred beacon problem. The resource reclaiming scheme reassigns unused slot time to non-real-time traffic by extending the collision period without violating the hard real-time guarantee. The simulation results show that the proposed scheme can not only enhance the schedulability of wireless network by up to 18% but also give more bandwidth to the non-real-time traffic up to 5.3%, while the resource reclaiming scheme can maximally improve the achievable throughput by 11% for the given stream set.