As microwave spectrum becomes increasingly scarce, millimeter wave communication has gained wide attention for its sufficient bandwidth, which is also considered as one of the key technologies in the Fifth Generation (5G) communication networks. Different from microwave, millimeter communication is easy to suffer from the blockages. In order to take advantage of the wide spectrum and avoid the big loss caused by blockage in millimeter D2D communication, we propose a hybrid communication model which employs mmWave communication when there is no blockage, and switch to microwave otherwise, and design the protocol among base stations and D2D equipment to implement such a hybrid scheme. Coverage probability and area spectrum efficiency are analyzed in closed-form for the proposed hybrid mode, conventional microwave mode and millimeter mode using stochastic geometry. The numerical results show that the hybrid communication model achieves better performance comparing to the microwave alone and millimeter wave alone.
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