Coexistence Analysis of D2D-Unlicensed and Wi-Fi Communications

By enabling direct communications between nearby user equipment (UE), device-to-device (D2D) communication has become one of the key technologies in 5th generation (5G) mobile networks. D2D brings new opportunities for devices, especially a highly dense network. In this paper, unlicensed spectrum, namely, D2D-Unlicensed (D2D-U), is discussed. The use frequency bands can ease shortage spectrum resources and improve network performance. However, D2D-U 5G significant effects on performance existing networks sharing same bands, such as Wi-Fi Bluetooth. Therefore, it necessary to design fair coexistence scheme D2D-U. To understand problem, we first formulate under two different schemes, listen before talk (LBT) duty cycle mechanism (DCM). Then, computer simulations investigate mode selection that switches these schemes point out best possible solution Wi-Fi.