spaper06 - 200 IEEE/ACM TRANSACTIONS ON NETWORKING, VOL. 8,...

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200 IEEE/ACM TRANSACTIONS ON NETWORKING, VOL. 8, NO. 2, APRIL 2000 A Priority Scheme for the IEEE 802.14 MAC Protocol for Hybrid Fiber-Coax Networks Mark D. Corner , Student Member, IEEE , Jörg Liebeherr , Member, IEEE , Nada Golmie , Member, IEEE , Chatschik Bisdikian , Senior Member, IEEE , and David H. Su , Member, IEEE Abstract— In order to support quality-of-service (QoS) for real-time data communications such as voice, video and inter- active services, multiaccess networks must provide an effective priority mechanism. The context of this work is the IEEE 802.14 standard for hybrid fiber coaxial (HFC) networks which has a shared upstream channel for transmissions from stations to the headend. This work presents a multilevel priority collision resolution scheme, which separates and resolves collisions between stations in a priority order, thereby, achieving the capability for preemptive priorities. We present a set of simulation scenarios which show the robustness and efficiency of the scheme, such as its ability to isolate higher priority traffic from lower priorities and to provide quick access to high-priority requests. In March 1998, a framework for handling priorities in the collision resolution process, which adopts a semantics similar to the semantics of our scheme, was included in the 802.14 standard. Index Terms— Local area networks, quality-of-service. I. INTRODUCTION E XISTING community cable television systems are evolving into bidirectional hybrid fiber coaxial (HFC) networks [18], [22] that can support interactive broadband applications, including video-on-demand, tele-conferencing, telephony, and Internet access. HFC is only one among sev- eral competing residential broadband access technologies, including digital subscriber line (xDSL), fiber to the home (FTTH), fiber to the curb (FTTC), fiber to the building (FTTB), local multipoint distribution service (LMDS), and wireless in the loop (WITL) [8], [10], [17], [22]. HFC networks are attractive as they can take advantage of the installed residential coax network's extensive coverage area. In comparison to xDSL, which takes advantage of installed telephone lines, HFC networks have significantly higher transmission capacity. The residential cable network architecture uses a hierarchical tree-and-branch topology with as many as 2000 subscribers at- tached at the leaves of the tree. The coaxial wire portion of the Manuscript received June 8, 1998; revised January 26, 1999; approved by IEEE/ACM TRANSACTIONS ON NETWORKING Editor T. Todd. The work of J. Liebeherr was supported in part by the National Science Foundation under Grant NCR-9624106 (CAREER) and Grant ANI-9730103. M. D. Corner is with the Department of Electrical Engineering and Com- puter Science, University of Michigan, Ann Arbor, MI 48109 USA (e-mail: mcorner@eecs.umid.edu). J. Liebeherr is with the Department of Computer Science, University of Vir-
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spaper06 - 200 IEEE/ACM TRANSACTIONS ON NETWORKING, VOL. 8,...

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