西安電子科技大學通信工程學院邀請Zuqing Zhu老師作了一場題為“Orchestrating Multicast-Oriented NFV Trees in Inter-DC Elastic Optical Networks(國米-DC彈性光網(wǎng)絡組播編排面向NFV樹)”的講座。西安電子科技大學通信工程學院是為國家培養(yǎng)通信領(lǐng)域高層次人才和科學研究的主要基地，是我國最早從事通信工程高等教育的院系之一，現(xiàn)為國家“985工程優(yōu)勢學科創(chuàng)新平臺”、“211工程”、“111計劃”重點建設(shè)。 設(shè)有通信與信息系統(tǒng)和密碼學兩個國家重點學科(均為批準的首批碩士點、博士點)和3個國家特色專業(yè)。在職研究生講座的主要內(nèi)容是：

　　已知的是通過在數(shù)據(jù)中心間(幀間DC)網(wǎng)絡并入網(wǎng)絡功能的虛擬化(NFV)，我們可以使用網(wǎng)絡資源更智能地更快速地部署新的服務。本文認為一個跨DC彈性光網(wǎng)絡(IDC-EON)和研究如何在它有效地協(xié)調(diào)了面向組播樹NFV(M-NFV-TS)。我們首先考慮脫機方案，其中所有的M-NFV-TS是已知的，需要在網(wǎng)絡中的被服務�；旌险麛�(shù)線性規(guī)劃(MILP)模型是制定準確解決問題，我們也提出了一種基于路徑交點(PI)一個啟發(fā)式，以減少時間復雜度。憑借豐富的模擬，我們表明，該啟發(fā)式可以接近MILP的低成本M-NFV-T配置的性能，但是只需要更短的運行時間。接著，在線場景，其中在M-NFV-TS可以來和即時離開被尋址，并且我們利用PI設(shè)計兩個在線算法在IDC-億萬編排動態(tài)M-NFV-Ts時，即，具有任批次(B-PI)或連續(xù)的(S-PI)的方案。仿真結(jié)果表明，與S-PI相比，B-PI能有效降低阻塞率。

　　原文：It is known that by incorporating network function virtualization (NFV) in inter-datacenter (inter-DC) networks, we can use the network resources more intelligently to deploy new services faster. This paper considers an inter-DC elastic optical network (IDC-EON) and studies how to orchestrate the multicast-oriented NFV trees (M-NFV-Ts) in it efficiently. We first consider an offline scenario in which all the M-NFV-Ts are known and need to be served in the network. A mixed integer linear programming (MILP) model is formulated to solve the problem exactly, and we also propose a heuristic based on path-intersection (PI) to reduce the time complexity. With extensive simulations, we show that the proposed heuristic can approximate the MILP's performance on low-cost M-NFV-T provisioning but only requires much shorter running time. Next, the online scenario where the M-NFV-Ts can come and leave on-the-fly is addressed, and we leverage PI to design two online algorithms for orchestrating dynamic M-NFV-Ts in IDC-EONs, i.e., with either the batch (B-PI) or sequential (S-PI) scheme. Simulation results indicate that compared with S-PI, B-PI can reduce blocking probability effectively.