标题: 输入伫列光交换机中具服务品质保证之光暂存器设计
On the Design of Optical Buffer for Optical Input-Queued Switches with Quality of Service Guarantees
作者: 林俊源
Chun-Yuan Lin
陈健
Chien Chen
资讯科学与工程研究所
关键字: 光延迟线;光暂存器;光交换机;服务品质;资源冲突;optical delay line;optical buffers;optical switch;quality of service;resource contention
公开日期: 2004
摘要: 在这篇论文中,我们提出了用于光交换机的光延迟线架构,此架构能够解决资源冲突并且利用多阶层优先权伫列来确保封包在传输过程中的服务品质。虽然光延迟线架构已被用来解决在光交换机中的资源冲突问题,但由于光具有持续进行的特性使得封包在随机存取管理时受到相当大的限制并同时增加了封包遗失的机率。更甚者,为了能够依照不同优先权的封包提供服务品质保证,往往需要数组的光延于线来实现与确保服务品质。因此,我们提出了单点传播循环的光延迟线架构,它能够解决输入伫列光交换机中的资源冲突问题。而为了改善在输入伫列交换机中因连线头端阻塞而降低的封包处理量,我们亦改善了单点传播循环光延迟线架构使其适用于更具有效率的窗框前瞻式排程演算法。除此之外,为了能够利用一组光延迟线来暂存不同优先权的封包,我们也设计了一套控制法则将光延迟线划分为许多个逻辑伫列来存放封包。最后,模拟结果显示单点传播循环的光延迟线架构能够有效地在维持服务品质时降低高优先权封包的遗失率,并且此架构能够容易地在光封包交换机上实作与控制。
This paper presents a quality of service (QoS) enable optical delay line (ODL) architecture to solve the problem of resource contention and support multilevel priority queues in an optical packet switch. ODL has been used in optical packet switches to resolve resource contention; however, the packets travel continuously in ODL limits the management of random access of the packets and increases the packet loss probability. Moreover, multiple ODL sets usually are needed to realize multiple priority queues in order to support QoS. In this paper, a new Unicast Recirculatiion ODL (URODL) architecture is proposed to resolve the output contention problem in an input-queued optical packet switch. To improve relatively poor throughput due to the head of Line (HOL) blocking in the input-queued switch, we modify URODL to support a more efficient window-based lookahead scheduling algorithm. Furthermore, a control strategy is designed to turn a single set of URODL into multiple logical queues to hold different priority packets. The simulation results show our URODL model reduces high priority packet loss effectively with the capability to support QoS. This URODL model can be easily implemented and managed in a fast optical packet switch.
URI: http://140.113.39.130/cdrfb3/record/nctu/#GT009123581
http://hdl.handle.net/11536/53368
显示于类别:Thesis


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