1、1/120Executive SummaryWith the flourishing development of ground cellular communication technology,from 4G changing life to 5G changing society,ground mobile communication hasachieved fruitful results.However,due to the difficulty and cost of construction,80%of the land area and over 95%of the ocean

2、 area have not been able to achieve groundmobilecommunicationnetworkcoverage.Satellitecommunicationhastheadvantages of wide coverage and no limitations of terrain environment,which canprovide communication services for remote areas and effectively make up for the lackofterrestrialnetwork.Researching

3、theintegrationofsatelliteandgroundcommunication technology to form an integrated space-ground communicationsystem is a common demand for satellite communication and ground cellularcommunication.3GPP(3rdGenerationPartnershipProject,3GPP)officiallyintroduced Non Terrestrial Networks(NTN)as a supplemen

4、t to ground networks inRelease 17,and conducted further research and standardization work on 5G NTN.The freezing of 5G NTN standards has attracted high attention from the globalindustry,with research institutes,operators,equipment companies,chip companies,terminal companies,etc.actively conducting r

5、esearch and verification work on 5GNTN technology.In addition,as one of the pillar technologies and basic networkforms of 6G,the integrated space-ground aims to meet the needs of wide areaintelligent connection and global ubiquitous seamless access in ten years,establishintelligent connections for w

6、ide area objects,provide intelligent services,and provideglobal uninterrupted and consistent information services for humanity.This white paper mainly elaborates on our exploration and practical thinking onthe integrated air-space-ground communication system from six aspects,includingrequirements an