2. SAGIN System Architecture*
Liao, Z.; Chen, C.; Ju, Y.; He, C.; Jiang, J.; Pei, Q. Multi-Controller Deployment in SDN-Enabled 6G Space–Air–Ground Integrated Network. Remote Sens. 2022, 14,
1076.
Basic SAGIN Architectures:
• Hybrid satellite-terrestrial relay network:
• Due to the influence of bad weather or obstacles,
terrestrial relays can be deployed in this architecture
to receive satellite signals.
• Satellite-terrestrial backhaul network:
• Satellite networks can be applied to serving as
backhaul networks to provide seamless services.
• Cognitive satellite-terrestrial network:
• The satellite-to-user link is considered as the primar
link that can occupy the spectrum resources anytime.
• Cooperative satellite-terrestrial network:
• Different from the three architectures above, each
segment in this cooperative architecture is integrated
closely.
3. Requirements of Service Oriented SAGINs
• Diverse service requirement fulfillment: New 6G demands: Extreme-high-speed and
high-capacity communications, extreme coverage extension, extreme-low power
consumption and cost reduction, extreme-low latency, extreme-reliable
communication, and extreme-massive connectivity & sensing.
• Dealing with customized services: With the development of 6G network, it is envisioned
that the network should support more customized and personalized services with
guaranteed quality for any service from any user
• On demand network reconfigurability: Service-oriented networks should be capable of
accommodating customized services with diverse requirements. To achieve this goal, the
network is envisioned to reconfigure according to the service demand.
• Multi-dimensional resource and mobility management: In SAGINs, the end-to-end service
fulfillment usually involves the network configuration and resource orchestration over
multiple domains. This introduces more severe challenges in service fulfillment since in
SAGINs the resources in different domain share very high heterogeneity.
5. Network Slicing Based on SAGINs architecture*
Features of the slicing based SAGIN:
• Automation
• Stabilization
• Customization
• Isolation
*Cheng, N.; He, J.; Yin, Z.; Zhou, C.; Wu, H.; Lyu, F.; Zhou, H.; Shen, X. 6G Service-Oriented Space-Air-Ground Integrated Network: A Survey. Chin. J. Aeronaut. 2021
6. C-RAN Based Architecture*
• Multiple CPU’s can be utilized to manage multiple
networks.
• Each user is connected to a base station cluster.
• Multiple network slices are assigned to each BS
cluster.
• Each slice corresponds to a specific network service
• Multiple resources are associated to each network
slice.
• Each user is served by a slice according to its service
requirements.
Open Problems:
• Location of CPU’s
• Management of network slices
• Heterogenous resource management and
orchestration
• Mobility management
*J. Wu, Z. Zhang, Y. Hong and Y. Wen, "Cloud radio access network (C-RAN): a primer," in IEEE Network, vol. 29, no. 1, pp. 35-41, Jan.-Feb. 2015
