A cyclic-executive-based QoS guarantee over USB

Chih Yuan Huang, Li-Pin Chang, Tei Wei Kuo

Research output: Contribution to journalConference article

8 Scopus citations


Universal Serial Bus (USB) is a popular standard for PC peripheral devices because of its versatile peripheral interconnection specifications. USB not only provides simplified hardware connectors but also supports for various bus traffics, such as isochronous and bulk transfer activities. Although the USB specifications provide a way for users to specify the upper bound on the number of bytes for each data transfer in a 1ms time frame, little work is done to provide QoS guarantees for devices (e.g., the lower bound on the bytes for each device type in a 1ms time frame) and a mechanism in enforcing the guarantees. In this paper we propose a cyclic-executive-based bandwidth reservation and scheduling method to support QoS guarantees over USB, especially for those isochronous bus activities. The proposed bandwidth reservation and scheduling method could reserve USB bandwidth for devices in an on-demand fashion. The capability of the proposed scheme was shown by the implementation and demonstration of a USB-based surveillance system prototype which adopted the proposed scheme.

Original languageEnglish
Article number1203040
Pages (from-to)88-95
Number of pages8
JournalReal-Time Technology and Applications - Proceedings
StatePublished - 1 Dec 2003
Event9th IEEE Real-Time and Embedded Technology and Applications Symposium, RTAS 2003 - Toronto, ON, Canada
Duration: 27 May 200330 May 2003

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