天地一体化信息网络频谱共享技术的综述与展望(上)

The Spectrum Sharing Technology of the Space-ground Integrated Information Network:Overview and Prospect(Ⅰ)

天地一体化信息网络是未来突破地面网络限制,实现空、天、地、海等多空间无缝覆盖和泛在连接的重要网络架构。但其天然的网络异构特性使子网间对于有限频谱资源的无干扰高效使用成为技术难点。对此,国内外学者进行了诸多天地一体化频谱共享研究,其成果不仅包含基于认知无线电技术的同频共存干扰规避方法,还包括在新一代变革网络从空口波形和核心网设计之初便考虑异构子网间的一体化频谱协同。文章从上述两种技术路径对现有研究成果进行了梳理,首先列举了天地一体化信息网络中可能的频谱共享场景,然后分析了频谱共存和一体化频谱协同中分别需要研究的重点问题和关键技术,进而针对上述分析给出两种技术路径下的研究进展梳理,最后针对该领域仍存在的开放问题做了展望。

The space-ground integrated information network is an important network architecture that will break through the limitations of the ground network in the future and achieve seamless coverage and ubiquitous connections in multiple spaces such as air,sky,earth,and sea.However,its natural heterogeneous network characteristics make the non-interference and efficient use of limited spectrum resources between sub-networks a technical difficulty.In this regard,domestic and foreign scholars have carried out many researches on space-ground integrated spectrum sharing.Their results include not only co-frequency coexistence interference avoidance methods based on cognitive radio technology,but also in the beginning of the new generation of transforming networks from the air interface and core network design that considered the integrated spectrum coordination among heterogeneous subnets.This paper combs the existing research results from the above two technical paths.Specifically,it first lists the possible spectrum sharing scenarios in the space-ground integrated information network.Then it analyzes the key points and technologies of spectrum coexistence and integrated spectrum collaboration.And then give a combing of the research progress under the two technical paths according to the above analysis.Finally,it gives the author's prospects for the open problems in this field.