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Cache-aided full-duplex: delivery time analysis and optimization

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Abstract

Edge caching has received much attention as a promising technique to overcome the stringent latency and data-hungry challenges in the future generation wireless networks. Meanwhile, full-duplex (FD) transmission can potentially double the spectral efficiency by allowing a node to receive and transmit at the same frequency band simultaneously. In this paper, we investigate the delivery time performance of a cache-aided FD system, in which an edge node, operates in FD mode, serves users via wireless channels and is equipped with a cache memory. Firstly, we derive a closed-form expression for the average delivery time by taking into account the uncertainties of both backhaul and access wireless channels. The derived analysis allows the examination of the impact of key parameters, e.g., cache size and transmit power. Secondly, a power optimization problem is formulated to minimize the average delivery time. To deal with the non-convexity of the formulated problem, we propose an iterative optimization algorithm based on the bisection method. Finally, numerical results are presented to demonstrate the effectiveness of the proposed algorithm. A significant delivery time reduction is achieved by the proposed optimization compared to the FD reference and half-duplex counterpart.

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Notes

  1. Considering a random model of \(\eta\) is left for future work.

  2. The computation time is assumed to be negligible.

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Acknowledgements

This work is supported by the Luxembourg National Research Fund under the project FNR CORE ProCAST, and by the European Research Council under project AGNOSTIC.

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Authors and Affiliations

  1. University of Luxembourg, Esch-sur-Alzette, Luxembourg

    Thang X. Vu & Symeon Chatzinotas

  2. VNU University of Engineering and Technology, Hanoi, Vietnam

    Anh Vu Trinh

  3. Le Quy Don Technical University, Hanoi, Vietnam

    Xuan Nam Tran

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  1. Thang X. Vu
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  2. Anh Vu Trinh
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  4. Xuan Nam Tran
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Correspondence to Thang X. Vu.

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Vu, T.X., Trinh, A.V., Chatzinotas, S. et al. Cache-aided full-duplex: delivery time analysis and optimization. Wireless Netw 26, 4403–4410 (2020). https://doi.org/10.1007/s11276-020-02334-y

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