多光纖WDM網(wǎng)中的QoS路由算法
QoS routing algorithm in multi-fiber WDM transport networks
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摘要: 利用區(qū)分光業(yè)務(DOS)模型可以將WDM光傳送網(wǎng)中客戶層(如IP)具有不同QoS要求的業(yè)務匯聚力較粗粒度的流,直接映射到光信道上,從而使客戶層業(yè)務的不同QoS要求可以體現(xiàn)在DOS域的邊緣光節(jié)點處的光路建立請求的不同優(yōu)先級上。該文首先探討了如何將多光纖WDM網(wǎng)轉(zhuǎn)化為波長圖,從而一次性解決選路和分配波長(RWA)問題,在此基礎上,提出兩種用于多光纖WDM網(wǎng)的QoS路由算法,對二者進行了比較,并進行了計算機仿真。Abstract: Basing on the DOS models aggregating ability, the client layers services with different QoS requirements can be mapped directly into the optical channel. Then the different QoS requirements of the client layers services can be reflected by the different priorities of the connection request at the border optical node in a DOS domain. A wavelength graph method is presented in the multi-fiber WDM optical transport network to reduce the blocking probability of the connection request. Two optical QoS routing strategies, concentrating method and equalizing method, are proposed. The two methods are compared by simulation results of the network performance in different dynamic traffic load situations.
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