Abstract
Enabling global Internet access is challenging for the Internet of Things due to limited range of terrestrial network services. One viable solution is to deploy satellites into terrestrial systems for coverage extension. However, operating a hybrid satellite-terrestrial system incurs potentially high satellite bandwidth consumption and excessive service latency. This work aims to reduce the content delivery delay and bandwidth consumption from the Internet-connected gateway to remote users in satellite terrestrial networks, using a two-tier cache-enabled full-duplex system model where content caches are placed at the satellite and the ground station. A closed-form solution for successful delivery probability of content files within allocated time slot under general caching policy is derived considering the requested content distributions and channel statistics. Illustrative results demonstrate superior performance of the proposed system over those of single-tier cache-aided. The trade-off between successful delivery probability and satellite bandwidth consumption, in addition to insights on the network support ability are also investigated.
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Acknowledgment
This work was supported by the La Trobe University Postgraduate Research Scholarship, the La Trobe University Full-Fee Research Scholarship, and the Net Zero Scholarship sponsored by Sonepar/SLS.
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Ngo, Q.T., Phan, K.T., Xiang, W., Mahmood, A., Slay, J. (2021). Two-Tier Cache-Aided Full-Duplex Content Delivery in Satellite–Terrestrial Networks. In: Mohaisen, D., Jin, R. (eds) Computational Data and Social Networks. CSoNet 2021. Lecture Notes in Computer Science(), vol 13116. Springer, Cham. https://doi.org/10.1007/978-3-030-91434-9_26
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DOI: https://doi.org/10.1007/978-3-030-91434-9_26
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