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Resource allocation for hybrid mode device-to-device communication networks

In order to improve data rate and spectrum utilization of cognitive device-to-device (D2D) communications, in this work we propose a hybrid mode D2D communication network and study resource allocation which maximizes the sum rate under the rate constraint for the primary cellular users. First of all, the subchannels mainly occupied by the cellular system are divided into occupied and empty channels. For the empty channels, an empty channel sharing protocol is proposed, which allows multiple D2D pairs to reuse the same empty channels. Generic algorithm which solves the formulated optimization problem is then used for channel assignment and transmit power allocation. Compared with single mode channel access, the simulation results show that the proposed hybrid mode resource allocation scheme can effectively improve the D2D transmission rate and spectral efficiency.