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Network Element Placement for Space-Air-Ground Integrated Network:A Tutorial

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With the demand for Internet connectiv-ity in remote areas,the space-air-ground integrated net-work(SAGIN)was proposed to achieve ubiquitous cover-age and enhance service capabilities of extant terrestrial networks.The paradigm of virtual network element place-ment(NEP)is applied into SAGIN.It can save energy and operating costs by placing specific network elements(NEs)as software instances.In addition,it helps to provide services in end-to-end networks with its ability to allocate and manage resources flexibly.However,NEP faces some challenges in SAGIN.The network topologies can be dynamic,and links such as the satellite-to-ground and air-to-ground ones are prone to fail.These will make NEP management more complicated.Moreover,the stat-ic NEP schemes are hard to accommodate the time-vary-ing traffic.In this context,this work explains the NEP problem in SAGIN from three aspects,i.e.,the SAGIN radio access network(RAN),the SAGIN core network(CN),and the SAGIN barrier network(BN).First,the physical and networking architectures of SAGIN are in-troduced.Then the status of the network element place-ment and corresponding challenges are described from these two aspects.Finally,this paper discusses future re-search directions and key technical challenges.

Network element placementSpace-airground integrated network(SAGIN)Software defined network(SDN)Network function virtualization(NFV)Network architecturesResource allocation

GENG Yuhui、CAO Xianbin、CUI Huanxi、XIAO Zhenyu

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School of Electronic and Information Engineering,Beihang University,Beijing 100191,China

National Key Research and Development ProgramBeijing Natural Science FoundationNational Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)

2020YFB1806800L2120036217101061827901

2022

10.1049/cje.2021.00.346

电子学报(英文)

电子学报(英文)

CSTPCDSCIEI
ISSN：1022-4653
年,卷(期)：2022.31(6)
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