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Rational use of unlicensed spectrum resources and the use of device-to-device (D2D) communication technologies are two essential technologies for improving the user experience and spectrum efficiency of future communication systems. In this paper, we propose an unlicensed spectrum-sharing scheme that targets the security needs of Wi-Fi users. Unlike the current unlicensed spectrum coexistence mechanism, we change &#x201C;coexistence by competition&#x201D; to &#x201C;coexistence by sharing&#x201D; and use D2D communication technology to share unlicensed spectrum resources with Wi-Fi users. This coexistence scheme allows the Wi-Fi system to surrender a portion of its spectrum resources in a way that allows cochannel interference when there is a security requirement by presenting the expected security requirements. Our analytical model and simulation experiments show that this method takes advantage of D2D proximity communication, provides more unlicensed spectrum resources to cellular users with less performance degradation for Wi-Fi users, and improves the total spectrum efficiency of the system.

Unlicensed Spectrum-Sharing Mechanism Based on Wi-Fi Security Requirements Implemented Using Device to Device Communication Technology