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Physical Layer Security in Cache-Enabled Heterogeneous Cellular Networks

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Physical Layer Security

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Abstract

In this chapter, we discuss physical layer security in a cache-enabled heterogeneous cellular network comprised of a macro base station and multiple small base stations (SBSs). We jointly devise caching placement and file delivery for achieving secure and energy-efficient transmissions against randomly distributed eavesdroppers. Specifically, we propose a novel hybrid “most popular content” and “largest content diversity” caching placement policy to distribute files of different popularities. Depending on the availability and placement of the requested file, we employ three cooperative transmission schemes, namely distributed beamforming, frequency-domain orthogonal transmission, and best SBS relaying. We derive analytical expressions for the connection outage probability and secrecy outage probability for each transmission scheme. Afterwards, we design the optimal transmission rates and caching allocation successively for maximizing the overall secrecy throughput and secrecy energy efficiency, respectively. We eventually provide numerical results to verify the proposed theoretical analysis and to demonstrate the superiority of the proposed hybrid caching policy.

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Notes

  1. 1.

    We assume that there is no direct transmission link from the MBS to the subscriber due to a deep fading and a long distance.

  2. 2.

    If multiple subscribers send file requests to an SBS simultaneously, in order to avoid the inter-user interference, these subscribers can be served using some orthogonal multiple access methods, e.g., TDMA and FDMA.

  3. 3.

    Typical examples include a regular user in the network, who has no authorization to access the content sent to others in a specific time slot and is thus treated as a potential eavesdropper. Although it is difficult for a BS to obtain the eavesdropper’s instantaneous CSI, the BS is still capable to learn the eavesdropper’ statistic CSI by collecting and analyzing an exceedingly large amount of information exchanging between the two parties during the other time slots.

  4. 4.

    With DBF, each SBS only requires the local CSI of itself instead of the global CSI, which greatly lowers the system overhead.

  5. 5.

    Throughout this paper, the letters “D,” “F,” and “B” refer to the DBF, FOT, and BSR transmission schemes, respectively.

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Author information

Authors and Affiliations

  1. Faculty of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an, China

    Tong-Xing Zheng

  2. Computer, Electrical and Mathematical Sciences & Engineering, The University of New South Wales, Sydney, Australia

    Jinhong Yuan

Authors
  1. Tong-Xing Zheng
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  2. Jinhong Yuan
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Correspondence to Jinhong Yuan .

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Editors and Affiliations

  1. School of Engineering, Western Sydney University, Penrith, NSW, Australia

    Khoa N. Le

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Zheng, TX., Yuan, J. (2021). Physical Layer Security in Cache-Enabled Heterogeneous Cellular Networks. In: Le, K.N. (eds) Physical Layer Security. Springer, Cham. https://doi.org/10.1007/978-3-030-55366-1_3

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  • DOI: https://doi.org/10.1007/978-3-030-55366-1_3

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-030-55365-4

  • Online ISBN: 978-3-030-55366-1

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