以訊務觀察法改善光突發交換技術之路徑建立效能; Improving Path Setup Performance of Optical Burst Switching by Traffic State Observation

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Title:	以訊務觀察法改善光突發交換技術之路徑建立效能;Improving Path Setup Performance of Optical Burst Switching by Traffic State Observation
Authors:	汪政儫;Cheng Wang
Contributors:	資訊工程研究所
Keywords:	高密度多波長分工;多波長分工;光突發式交換;光纖網路;訊務觀察;optical burst switching;optical network;DWDM;WDM;traffic observation
Date:	2001-07-19
Issue Date:	2009-09-22 11:29:38 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	光纖網路(Optical Network)技術日亦成熟，其中以突發式交換(Optical Burst Switching)技術為目前較為可行之技術。在此技術中的傳輸單位為burst，一個burst是由多個到達相同邊際路由器(edge router)封包所組成。每一個burst在傳送之前需要等待一個路徑建立時間之後才可傳送。因此本論文提出一以訊務量觀察的方式，在觀察訊務量之狀況高於一預設之門檻值時，以建立一永久式路徑取代原burst用完即查除之路徑，使得後續相同目的地之burst得以省去建立路徑之動作與時間，待觀察知訊務量降低至一界限值，即拆除此永久式路徑。在永久式路徑建立到拆除這段期間，因每一個burst無須重建路徑，亦無須等待路徑建立之時間，當burst形成之後可以立即傳送，因此該路徑的傳輸效能得以增加。在本論文中，亦提出一慣用性通道排程法，使得使用率較高的路徑在交換機中具有較高的路徑建立成功率。 The technologies of optical networks become more and more mature. The optical burst switching is the most feasible way for transmitting optical data. A burst is a basic atom in optical burst switching networks. A burst is assembled from several packets that will reach the same destination in an edge router. Before burst transmission, the edge needs to send a BHP (burst header packet) to establish a path for burst transmission and wait for an offset time. This paper proposed a method using traffic observation to remove the offset time from bursts. When edge router detect traffic volume over a threshold. It will establish a persistent path instead of original temporary path. That will cause the follow up bursts to the same destination need not send BHPs and transmit immediately. Till the traffic volume is smaller then the threshold, the edge router will tear down this persistent path. The duration between a persistent path establish and tear down, each burst can transmit immediately so that the transmission performance will be increased. In the end of this paper, a consuetude channel schedule algorithm is proposed. It make a highly utilized path will have a higher probability to reserve channel at core optical switch.
Appears in Collections:	[Graduate Institute of Computer Science and Information Engineering] Electronic Thesis & Dissertation

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