TY - JOUR
T1 - Space-air-ground integrated network
T2 - A survey
AU - Liu, Jiajia
AU - Shi, Yongpeng
AU - Fadlullah, Zubair Md
AU - Kato, Nei
N1 - Funding Information:
Manuscript received November 10, 2017; revised April 9, 2018; accepted May 22, 2018. Date of publication May 29, 2018; date of current version November 19, 2018. This work was supported in part by the National Natural Science Foundation of China under Grant 61771374, Grant 61771373, and Grant 61601357, in part by China 111 Project under Grant B16037, and in part by the Fundamental Research Fund for the Central Universities under Grant JB171501, Grant JB181506, Grant JB181507, and Grant JB181508. (Corresponding author: Jiajia Liu.) J. Liu is with the State Key Laboratory of Integrated Services Networks, School of Cyber Engineering, Xidian University, Xi’an 710071, China (e-mail: liujiajia@xidian.edu.cn).
Publisher Copyright:
© 1998-2012 IEEE.
PY - 2018/10/1
Y1 - 2018/10/1
N2 - Space-air-ground integrated network (SAGIN), as an integration of satellite systems, aerial networks, and terrestrial communications, has been becoming an emerging architecture and attracted intensive research interest during the past years. Besides bringing significant benefits for various practical services and applications, SAGIN is also facing many unprecedented challenges due to its specific characteristics, such as heterogeneity, self-organization, and time-variability. Compared to traditional ground or satellite networks, SAGIN is affected by the limited and unbalanced network resources in all three network segments, so that it is difficult to obtain the best performances for traffic delivery. Therefore, the system integration, protocol optimization, resource management, and allocation in SAGIN is of great significance. To the best of our knowledge, we are the first to present the state-of-the-art of the SAGIN since existing survey papers focused on either only one single network segment in space or air, or the integration of space-ground, neglecting the integration of all the three network segments. In light of this, we present in this paper a comprehensive review of recent research works concerning SAGIN from network design and resource allocation to performance analysis and optimization. After discussing several existing network architectures, we also point out some technology challenges and future directions.
AB - Space-air-ground integrated network (SAGIN), as an integration of satellite systems, aerial networks, and terrestrial communications, has been becoming an emerging architecture and attracted intensive research interest during the past years. Besides bringing significant benefits for various practical services and applications, SAGIN is also facing many unprecedented challenges due to its specific characteristics, such as heterogeneity, self-organization, and time-variability. Compared to traditional ground or satellite networks, SAGIN is affected by the limited and unbalanced network resources in all three network segments, so that it is difficult to obtain the best performances for traffic delivery. Therefore, the system integration, protocol optimization, resource management, and allocation in SAGIN is of great significance. To the best of our knowledge, we are the first to present the state-of-the-art of the SAGIN since existing survey papers focused on either only one single network segment in space or air, or the integration of space-ground, neglecting the integration of all the three network segments. In light of this, we present in this paper a comprehensive review of recent research works concerning SAGIN from network design and resource allocation to performance analysis and optimization. After discussing several existing network architectures, we also point out some technology challenges and future directions.
KW - Network design and protocol optimization
KW - Performance analysis
KW - Quality of service
KW - Resource allocation
KW - Space-air-ground integrated network
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U2 - 10.1109/COMST.2018.2841996
DO - 10.1109/COMST.2018.2841996
M3 - Review article
AN - SCOPUS:85047813222
VL - 20
SP - 2714
EP - 2741
JO - IEEE Communications Surveys and Tutorials
JF - IEEE Communications Surveys and Tutorials
SN - 1553-877X
IS - 4
M1 - 8368236
ER -