節(jié)點(diǎn)中介性和頻譜離散度感知虛擬光網(wǎng)絡(luò)生存性協(xié)同映射

劉煥淋; 胡會(huì)霞; 陳勇; 溫濛; 王展鵬

doi:10.11999/JEIT190543

節(jié)點(diǎn)中介性和頻譜離散度感知虛擬光網(wǎng)絡(luò)生存性協(xié)同映射

doi: 10.11999/JEIT190543

1.
重慶郵電大學(xué)通信與信息工程學(xué)院重慶 400065
2.
重慶郵電大學(xué)自動(dòng)化學(xué)院重慶 400065

基金項(xiàng)目: 國(guó)家自然科學(xué)基金(51977021)；重慶市科技局自然科學(xué)基金 (CSTC2019jcyj-msxmX0613)

詳細(xì)信息

作者簡(jiǎn)介:
劉煥淋：女，1970年生，教授，研究方向?yàn)楣馔ㄐ偶夹g(shù)與未來(lái)網(wǎng)絡(luò)

胡會(huì)霞：女，1997年生，碩士生，研究方向?yàn)樯婀饩W(wǎng)絡(luò)頻譜路由

陳勇：男，1963年生，教授，研究方向?yàn)楣馔ㄐ排c傳感檢測(cè)技術(shù)

溫濛：女，1996年生，碩士生，研究方向?yàn)楣馔ㄐ藕凸饩W(wǎng)絡(luò)

王展鵬：男，1996年生，碩士生，研究方向?yàn)楣饩W(wǎng)絡(luò)資源分配

通訊作者:
劉煥淋　liuhl2@sina.com

中圖分類號(hào): TN929.11
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- 文章訪問(wèn)數(shù): 1676
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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2019-07-18
- 修回日期: 2020-07-08
- 網(wǎng)絡(luò)出版日期: 2020-07-22
- 刊出日期: 2020-09-27

Survivability Coordinated Mapping Based on Node Centrality and Spectrum Dispersion Awareness for Virtual Optical Networks

1.
School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
2.
School of Automation, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

Funds: The National Natural Science Foundation of China(51977021), The Natural Science Foundation Project of Chongqing Science and Technology Commission (CSTC2019 jcyj-msxmX0613)

摘要

摘要: 虛擬網(wǎng)絡(luò)的映射策略影響彈性光網(wǎng)絡(luò)(EON)資源可用性和網(wǎng)絡(luò)生存性。該文提出一種基于節(jié)點(diǎn)間距離和頻譜離散度感知的虛擬光網(wǎng)絡(luò)生存性協(xié)同映射(CM-DSDA)算法，研究節(jié)點(diǎn)計(jì)算資源和拓?fù)湮恢弥薪樾缘墓夤?jié)點(diǎn)排序策略，設(shè)計(jì)頻譜離散度方法評(píng)價(jià)鏈路頻譜碎片化程度。在虛擬鏈路的生存性映射中，選擇鄰接已映射節(jié)點(diǎn)中消耗頻隙數(shù)少且頻譜離散度低的工作光路和保護(hù)光路協(xié)同映射虛擬網(wǎng)絡(luò)。仿真結(jié)果表明所提算法能有效地提高EON的頻譜占用率和減少帶寬阻塞率。
- 虛擬光網(wǎng)絡(luò) /
- 生存性協(xié)同映射 /
- 節(jié)點(diǎn)中介性 /
- 頻譜離散度 /
- 頻譜占用率
Abstract: The mapping strategy of virtual network has important effect on the resource availability and survivability of the Elastic Optical Network (EON). A survivable virtual optical network Coordinated Mapping based on the Distance and Spectrum Dispersion Awareness (CM-DSDA) between nodes is proposed in the paper. A physical node weighted sorting strategy is studied, which not only considers the number of physical node computing resources, but also considers the location centrality of the physical nodes in the EON topology. And a method of spectrum dispersion is designed to evaluate the link’s spectrum fragmentation. During the virtual link’s survivability mapping, the working and protection optical paths adjacent the position of the mapped physical nodes with the minimum number of spectrum usage and the lowest frequency spectrum dispersion are selected to coordinated mapping the virtual optical networks. Simulation results show that the CM-DSDA can effectively increase the EON’s spectrum utilization and reduce bandwidth blocking probability.
- Virtual optical network /
- Survivable coordinated mapping /
- Node centrality /
- Spectrum dispersion /
- Spectrum usage ratio

HTML全文

圖 1 網(wǎng)絡(luò)拓?fù)涫疽鈭D

下載: 全尺寸圖片幻燈片

圖 2 光虛擬網(wǎng)絡(luò)映射示意圖

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圖 3 仿真網(wǎng)絡(luò)拓?fù)?/p>

下載: 全尺寸圖片幻燈片

圖 4 不同α和負(fù)載下兩種算法的帶寬阻塞率

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圖 5 不同負(fù)載下4種算法的帶寬阻塞率

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圖 6 不同負(fù)載下4種算法的頻譜利用率

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表 1 CM-DSDA算法

輸入：EON拓?fù)?{G^{\rm{S}}} = \left( {{N^{\rm{S}}},{E^{\rm{S}}},C_{}^{\rm{S}},A_{}^{\rm{S}}} \right)$，虛擬網(wǎng)絡(luò)請(qǐng)求${G^{\rm{V}}} = \left( {{N^{\rm{V}}},{E^{\rm{V}}},C_{}^{\rm{V}},A_{}^{\rm{V}}} \right)$。
輸出：虛擬網(wǎng)絡(luò)生存性映射的節(jié)點(diǎn)、工作光路、保護(hù)光路和頻譜分配結(jié)果。
步驟1 ?根據(jù)式(5)計(jì)算虛擬節(jié)點(diǎn)權(quán)值，根據(jù)式(6)計(jì)算光節(jié)點(diǎn)的權(quán)值，降序排序虛擬節(jié)點(diǎn)和光節(jié)點(diǎn)在虛擬節(jié)點(diǎn)集合VNR{v₁, v₂, ···, v_N}和光　節(jié)點(diǎn)集SNR{s₁, s₂, ···, s_M}中。虛擬節(jié)點(diǎn)數(shù)N，光節(jié)點(diǎn)數(shù)M，若N>M，阻塞該虛擬網(wǎng)絡(luò)請(qǐng)求，否則，設(shè)n=1；
步驟2 ?根據(jù)約束式(1)和式(2)，根據(jù)首選即中原則判斷光節(jié)點(diǎn)s_i的剩余計(jì)算資源數(shù)是否滿足虛擬節(jié)點(diǎn)v_n需求，s_i∈SNR，i=1, 2, ···, M，若　滿足，將v_n映射在s_i上，并在SNR集合中刪除已映射的光節(jié)點(diǎn)s_i。若N=1，輸出虛擬網(wǎng)絡(luò)映射結(jié)果，否則，n=n+1，轉(zhuǎn)步驟3；
步驟3 ?在EON中，計(jì)算所有候選光節(jié)點(diǎn)與已經(jīng)映射光節(jié)點(diǎn)之間滿足式(3)約束的虛擬鏈路映射的最短跳光路，判斷每條最短光路是否滿足　虛擬網(wǎng)絡(luò)需求和光路上個(gè)鏈路頻譜一致性和連續(xù)性的可用頻譜塊，若滿足，光路加入候選映射的光路集合P中；
步驟4 ?在集合P中，對(duì)每條最短光路p_k，采用首次命中的頻譜分配方式進(jìn)行光路的滿足頻譜一致性和連續(xù)性的頻譜預(yù)分配；根據(jù)式(7)計(jì)算　該光路的頻譜離散度并確定光路的重載鏈路${\rm{max\{ F}}_l^{{p_k}}\} $，加入重載鏈路集合{$l_{\max }^1$, $l_{\max }^2$, ···, $l_{\max }^k$}中，根據(jù)頻譜離散度大小升序排列重載鏈　路集合；
步驟5 ?選擇集合{$l_{\max }^1$, $l_{\max }^2$, ···,$l_{\max }^k$}中的第1條鏈路所對(duì)應(yīng)光路${p_k}$，將其作為虛擬鏈路的映射光路，則該映射光路的另一端點(diǎn)即是虛擬節(jié) 　點(diǎn)v_n映射的光節(jié)點(diǎn)，并在SNR集合中刪除已映射光節(jié)點(diǎn)s_i；
步驟6 ?在EON中，通過(guò)邊分離的最短光路算法確定滿足式(4)約束的映射光路的生存性保護(hù)光路，判斷保護(hù)光路是否有滿足虛擬網(wǎng)絡(luò)資源　需求和滿足光路上各鏈路的頻譜一致性和連續(xù)性的可用頻譜塊，若有，轉(zhuǎn)至步驟7；若無(wú)，則阻塞該虛擬網(wǎng)絡(luò)請(qǐng)求；
步驟7 ?分別用首次命中與頻譜最大共享度的頻譜分配方式，為工作光路和保護(hù)光路分配滿足頻譜一致性和連續(xù)性的頻譜資源，更新映射　后光節(jié)點(diǎn)剩余計(jì)算資源，若n < N，轉(zhuǎn)步驟2；
步驟8　輸出虛擬網(wǎng)絡(luò)映射結(jié)果。

下載: 導(dǎo)出CSV

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