@article{yin_luan_cheng_hui_wang_2022, 
  title={Cybertwin-enabled 6G Space-air-ground Integrated Networks: Architecture,   Open Issue, and Challenges}, 
  abstractNote={Space-air-ground integrated network (SAGIN) is considered as a core
requirement in emerging 6G networks, which integrates the terrestrial and
non-terrestrial networks to reach the full network coverage and ubiquitous
services. To envision the ubiquitous intelligence and the deep integration in
6G SAGIN, a paradigm of cybertwin-enabled 6G SAGIN is presented in this paper.
Specifically, a cybertwin-enabled SAGIN architecture is first presented, where
a novel five-dimension digital twin (DT) model is presented. Particularly,
three categories of critical technologies are presented based on the cybertwin
of SAGIN, i.e., cybertwin-based multi-source heterogeneous network integration,
cybertwin-based integrated cloud-edge-end, and cybertwin-based integrated
sensing-communication-computing. Besides, two open issues in the
cybertwin-enabled SAGIN are studied, i.e., the networking decision and
optimization and the cybertwin-enabled cross-layer privacy and security, where
the challenges are discussed and the potential solutions are directed. In
addition, a case study with federal learning is developed and open research
issues are discussed.}, 
  author={Yin and Luan and Cheng and Hui and Wang}, 
  year={2022}, 
  month={Apr}
  }