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Research On Dispatching And Energy-saving Mechanisms About Clos Switch Network

Posted on:2015-07-20Degree:MasterType:Thesis
Country:ChinaCandidate:X S WangFull Text:PDF
GTID:2348330464970266Subject:Communication and Information System
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With the social development and science and technology progress,network switch technology as an important part of the communication system,has also been significantly improved.In recent years,due to the widespread popularity of the Internet,the number of network users has expanded rapidly,and the network traffic types are also becoming more and more diverse,the existing network switch technologies are facing enormous challenges and the studies of new switch dispatching scheduling scheme are in urgent need.Efficient switch technologies in Clos network are the mainstream technologies being researched,research in energy-saving switch based on Clos network is a new hot spot,how to be green becames an important factor what an IT technology researcher need to consider in his design and study.The main idea of this thesis is shown as follows,firstly we propose the switch fabric,aiming at minimize the hardware complexity of the switch system,and then propose the scheduling algorithm based on the certain switch structure,we hope to achieve the best overall performance of the switch scheduling scheme both in software and hardware at the same time.In this thesis I will do a lot research on green switch technology,the main work of this thesis is shown as follows:(1)A energy-saving orthogonal routing scheduling scheme with the characteristic traffic self-adaption and free of cell disorder is proposed.Firstly we propose a orthogonal routing scheduling scheme,and then we make a step by step improvement of it from the priority code,weight formula,third-stage buffers architecture and energy-saving switch mechanism.In this thesis we propose several different coding schemes,simulation shows that different coding schemes as weights really have a great impact on switch scheduling fairness;The network traffic distribution is not necessarily very balanced,so we make a improvement of weights formula based on the priority coding weights,we gradually add the queue length,middle-stage output port conflict factor and other factors that can reflect the distribution of traffic,finally we find our scheduling scheme shows good results under a variety of traffic sources;Disorder problem has been an unsolved problem in most scheduling schemes,especially when we want to achieve high throughput performance and ordered siwtch in the same time,it will require high hardware and software complexity,in the third chapter we successfully achieve ordered switch at the least cost through improving the switch fabric and scheduling algorithms of the third stage;we also propose a on-off mechanism of middle-stage switch unit based on the first-stage queue length,simulation shows that our scheduling scheme performs good energy-saving effect under a variety of unicast traffic.(2)Two energy-saving scheduling schemes which suit for multicast traffic are proposed.In consideration of multicast traffic shares more and more proportion in the network,in this thesis we propose a MMM-type energy-saving Clos switch architecture that suits for multicast traffic,and we propose two energy-saving scheduling schemes based on the architecture,one scheme is realized through detecting middle-stage buffer utilization and the other is implemented through joint detection of the first-stage input port buffer and the third-stage input port buffer.Simulation shows that our scheduling scheme can still meet a good switch performance on condition that we reduce certain resources.
Keywords/Search Tags:Clos switch network, Orthogonal routing, Crosspoint buffers
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