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收集所有交通大學研究人員與學生個人或團體所發表之各項學術著作，涵蓋期刊論文、教師專書、學位論文等項。;;Collections of Publications of NCTU Researchers and Students Like Journal Papers and Thesis.

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Author: search.filters.author.Yuang, Maria C.Subject: search.filters.subject.Medium access control (MAC)

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    A Novel Optical-Header Processing and Access Control System for a Packet-Switched WDM Metro Ring Network
    (2009-11-01)
    Yuang, Maria C.
    ;
    Lin, Yu-Min
    ;
    Wang, Ya-Shian
    ;
    資訊工程學系
    ;
    Department of Computer Science
    Optical packet switching (OPS) has been considered to be a promising paradigm to support a wide range of applications with different time-varying and high bandwidth demands for future optical metropolitan area networks (MANs). In this paper, we present the design of an experimental optical-header processing and access control system (OPACS) for an OPS wavelength-division multiplexing metro slotted-ring network. On the slotted ring, each control header is in-band time-division-multiplexed with its corresponding payload within a slot. OPACS enables the optical headers across all parallel wavelengths to be efficiently received, modified, and retransmitted by means of a wavelength-time conversion technique. Moreover, OPACS embodies a versatile medium access control (MAC) scheme, referred to as the distributed multigranularity and multiwindow reservation (DMGWR) mechanism, which is particularly advantageous for traffic of high and varying loads and burstiness. Basically, DMGWR requires each node to make reservation requests prior to transmissions while maintaining a distributed queue for ensuring fair access of bandwidth. By "multigranularity," each node can make a reservation of multiple slots at a time. By "multiwindow," each node is allowed to have multiple outstanding reservations within the window size. From simulation results that pit the OPACS network against two other existing networks, we show that the OPACS network outperforms these networks with respect to throughput, access delay, and fairness under various traffic patterns. Experimental results demonstrate that all optical headers are removed and combined with the data in a fully synchronous manner, justifying the viability of the system.
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    HOPSMAN: An Experimental Optical Packet-Switched Metro WDM Ring Network With High-Performance Medium Access Control
    (2010-02-01)
    Yuang, Maria C.
    ;
    Chao, I-Fen
    ;
    Lo, Bird C.
    ;
    資訊工程學系
    ;
    Department of Computer Science
    Future optical metropolitan area networks (MANs) have been expected to exploit advanced optical packet switching (OPS) technologies to cost-effectively satisfy a wide range of applications having time-varying and high bandwidth demands and stringent delay requirements. In this paper, we present the architecture and access control of our experimental high-performance OPS metro WDM slotted-ring network (HOPSMAN). HOPSMAN has a scalable architecture in which the node number is unconstrained by the wavelength number. It encompasses a handful of nodes (called server nodes) that are additionally equipped with optical slot erasers capable of erasing optical slots resulting in an increase in bandwidth efficiency. In essence, HOPSMAN is governed by a novel medium access control (MAC) scheme, called probabilistic quota plus credit (PQOC). PQOC embodies a highly efficient and fair bandwidth allocation in accordance with a quota being exerted probabilistically. The probabilistic quota is then analytically derived taking the server-node number and destination-traffic distribution into account. Besides, PQOC introduces a time-controlled credit for regulating a fair use of the remaining bandwidth, particularly in the metro environment with traffic of high burstiness. Extensive simulation results show that HOPSMAN with PQOC achieves exceptional delay-throughput performance under a wide range of traffic loads and burstiness.