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The coverage probability of both the cellular users and the Device-to-Device (D2D) users are analyzed.We assume that the cellular users are able to communication with the Base Station (BS) either by relying on the assistance of Full-Duplex (FD) mode relays or via direct user-to-BS links with high-enough Signal-to-Interference-plus-Noise-Ratio (SINR).Note that the FD-mode devices are capable of simultaneously operating in two modes,i.e.the D2D mode and the cooperative relay mode,with the sum power consumption at these devices kept constant.The closed-form expressions for coverage probability of both tier users are derived.After that,numerical analyses are provided,showing that the coverage probability of the both the cellular and the D2D users can be substantially influenced by a variety of parameters,including the power allocation factor of the relays,the density of users,and the self-interference imposed on the FD mode relays,etc.Furthermore,in the D2D enabled networks,it is shown that the FD relay aided transmission is beneficial to enhancing the coverage probability of the cellular users if the target SINR is lower than 5 dB.