In recent years,intensified environmental pollution and climate change have increasingly exposed the world to natural disasters such as earthquakes and floods,resulting in substantial economic losses[1].These disaster...In recent years,intensified environmental pollution and climate change have increasingly exposed the world to natural disasters such as earthquakes and floods,resulting in substantial economic losses[1].These disasters frequently damage terrestrial communication infrastructures,making the rapid deployment of emergency communication networks in affected areas critical in increasing rescue efficiency[2].展开更多
This article presents a comprehensive study on the emerging near-space communications (NS-COM) within the context of space–air–ground–sea integrated network (SAGSIN). Specifically, we firstly explore the recent tec...This article presents a comprehensive study on the emerging near-space communications (NS-COM) within the context of space–air–ground–sea integrated network (SAGSIN). Specifically, we firstly explore the recent technical developments of NS-COM, followed by the discussions about motivations behind integrating NS-COM into SAGSIN. To further demonstrate the necessity of NS-COM, a comparative analysis between the NS-COM network and other counterparts in SAGSIN is conducted, covering aspects of deployment, coverage, channel characteristics, and unique problems of NS-COM network. Afterward, the technical aspects of NS-COM, including channel modeling, random access, channel estimation, array-based beam management, and joint network optimization, are examined in detail. Furthermore, we explore the potential applications of NS-COM, such as structural expansion in SAGSIN communication, civil aviation communication, remote and urgent communication, weather monitoring, and carbon neutrality. Finally, some promising research avenues are identified, including stratospheric satellite-to-ground direct links for mobile terminals, reconfigurable multiple-input multiple-output and holographic multiple-input multiple-output, federated learning in NS-COM networks, maritime communication, electromagnetic spectrum sensing and adversarial game, integrated sensing and communications, stratospheric-satellite-based radar detection and imaging, NS-COM-assisted enhanced global navigation system, NS-COM-assisted intelligent unmanned system, and free-space optical communication. Overall, this paper highlights that the NS-COM plays an indispensable role in the SAGSIN puzzle, providing substantial performance and coverage enhancement to the traditional SAGSIN architecture.展开更多
Space–air–ground integrated networks(SAGINs)have been considered to be the trend of future 6G network development.In the presence of hostile interferers/attackers especially under military application scenarios,the ...Space–air–ground integrated networks(SAGINs)have been considered to be the trend of future 6G network development.In the presence of hostile interferers/attackers especially under military application scenarios,the resilience of the SAGIN to various threats such as physical,electronic,and cyberattacks can be crucial to guarantee desirable networking performance.This motivates advanced enhancement and evaluation schemes for the resilience of SAGIN.In this paper,the SAGIN resilience enhancement process is divided into 4 resilience enhancement phases,namely,resistance,absorption,recovery,and reconfiguration.Then,different resilience enhancement methods are discussed and analyzed within each phase,respectively.Further,considering that SAGIN is coupled by several cross-domain subsystems,the indicator system for resilience capabilities evaluation and evaluation methods of SAGIN are given.Firstly,the resilience capability of each subsystem is evaluated based on 4 indicators,namely,resistance,absorption,recovery,and reconfiguration capability.Then,by combining the resilience capability of the space-based,air-based,and ground-based communication subnetworks,the overall resilience enhancement capability of SAGIN is evaluated.展开更多
Near-space communication network(NS-ComNet),as an indispensable component of sixth-generation(6G)and beyond mobile communication systems and the space–air–ground–sea integrated network(SAGSIN),demonstrates unique a...Near-space communication network(NS-ComNet),as an indispensable component of sixth-generation(6G)and beyond mobile communication systems and the space–air–ground–sea integrated network(SAGSIN),demonstrates unique advantages in wide-area coverage,long-endurance high-altitude operation,and highly flexible deployment.This paper presents a comprehensive review of NS-ComNet for 6G and beyond era.Specifically,by contrasting satellite,low-altitude unmanned aerial vehicle(UAV),and terrestrial communications,we first elucidate the background and motivation for integrating NSComNet into 6G network architectures.Subsequently,we review the developmental status of nearspace platforms,including high-altitude balloons,solar-powered UAVs,and stratospheric airships,and analyze critical challenges faced by NS-ComNet.To address these challenges,the research focuses on key enabling technologies such as topology design,resource and handover management,and multiobjective joint optimization,with particular emphasis on artificial intelligence techniques for NS-ComNet.Finally,envisioning future intelligent collaborative networks that integrate NS-ComNet with satellite–UAV–terrestrial systems,we explore promising directions.This paper aims to provide technical insights and research foundations for the systematic construction of NS-ComNet and its deep deployment in the 6G and beyond era.展开更多
基金supported in part by the National Natural Science Foundation of China(U2441226).
文摘In recent years,intensified environmental pollution and climate change have increasingly exposed the world to natural disasters such as earthquakes and floods,resulting in substantial economic losses[1].These disasters frequently damage terrestrial communication infrastructures,making the rapid deployment of emergency communication networks in affected areas critical in increasing rescue efficiency[2].
基金supported in part by the Beijing Nova Program,the Shandong Province Natural Science Foundation under grant ZR2022YQ62the Natural Science Foundation of China(NSFC)under grants 62071044 and U2233216.
文摘This article presents a comprehensive study on the emerging near-space communications (NS-COM) within the context of space–air–ground–sea integrated network (SAGSIN). Specifically, we firstly explore the recent technical developments of NS-COM, followed by the discussions about motivations behind integrating NS-COM into SAGSIN. To further demonstrate the necessity of NS-COM, a comparative analysis between the NS-COM network and other counterparts in SAGSIN is conducted, covering aspects of deployment, coverage, channel characteristics, and unique problems of NS-COM network. Afterward, the technical aspects of NS-COM, including channel modeling, random access, channel estimation, array-based beam management, and joint network optimization, are examined in detail. Furthermore, we explore the potential applications of NS-COM, such as structural expansion in SAGSIN communication, civil aviation communication, remote and urgent communication, weather monitoring, and carbon neutrality. Finally, some promising research avenues are identified, including stratospheric satellite-to-ground direct links for mobile terminals, reconfigurable multiple-input multiple-output and holographic multiple-input multiple-output, federated learning in NS-COM networks, maritime communication, electromagnetic spectrum sensing and adversarial game, integrated sensing and communications, stratospheric-satellite-based radar detection and imaging, NS-COM-assisted enhanced global navigation system, NS-COM-assisted intelligent unmanned system, and free-space optical communication. Overall, this paper highlights that the NS-COM plays an indispensable role in the SAGSIN puzzle, providing substantial performance and coverage enhancement to the traditional SAGSIN architecture.
基金supported by the National Natural Science Foundation of China(nos.U22A2007 and 62171010).
文摘Space–air–ground integrated networks(SAGINs)have been considered to be the trend of future 6G network development.In the presence of hostile interferers/attackers especially under military application scenarios,the resilience of the SAGIN to various threats such as physical,electronic,and cyberattacks can be crucial to guarantee desirable networking performance.This motivates advanced enhancement and evaluation schemes for the resilience of SAGIN.In this paper,the SAGIN resilience enhancement process is divided into 4 resilience enhancement phases,namely,resistance,absorption,recovery,and reconfiguration.Then,different resilience enhancement methods are discussed and analyzed within each phase,respectively.Further,considering that SAGIN is coupled by several cross-domain subsystems,the indicator system for resilience capabilities evaluation and evaluation methods of SAGIN are given.Firstly,the resilience capability of each subsystem is evaluated based on 4 indicators,namely,resistance,absorption,recovery,and reconfiguration capability.Then,by combining the resilience capability of the space-based,air-based,and ground-based communication subnetworks,the overall resilience enhancement capability of SAGIN is evaluated.
基金supported in part by the Natural Science Foundation of China(NSFC)under Grant U2233216 and Grant 62471036in part by the Beijing Natural Science Foundation under Grant L242011+1 种基金in part by the Shandong Province Natural Science Foundation under Grant ZR2025QA30 and Grant ZR2022YQ62in part by the Beijing Nova Program.
文摘Near-space communication network(NS-ComNet),as an indispensable component of sixth-generation(6G)and beyond mobile communication systems and the space–air–ground–sea integrated network(SAGSIN),demonstrates unique advantages in wide-area coverage,long-endurance high-altitude operation,and highly flexible deployment.This paper presents a comprehensive review of NS-ComNet for 6G and beyond era.Specifically,by contrasting satellite,low-altitude unmanned aerial vehicle(UAV),and terrestrial communications,we first elucidate the background and motivation for integrating NSComNet into 6G network architectures.Subsequently,we review the developmental status of nearspace platforms,including high-altitude balloons,solar-powered UAVs,and stratospheric airships,and analyze critical challenges faced by NS-ComNet.To address these challenges,the research focuses on key enabling technologies such as topology design,resource and handover management,and multiobjective joint optimization,with particular emphasis on artificial intelligence techniques for NS-ComNet.Finally,envisioning future intelligent collaborative networks that integrate NS-ComNet with satellite–UAV–terrestrial systems,we explore promising directions.This paper aims to provide technical insights and research foundations for the systematic construction of NS-ComNet and its deep deployment in the 6G and beyond era.
