QoS-aware mode selection and resource allocation scheme for Device-to-Device (D2D) communication in cellular networks

In the cellular network, Device-to-Device (D2D) communication is considered to be a promising resource reuse strategy, which can enable local service opportunities and reduce system load for short-range communication. In order to suppress the interference from D2D users, the scheduler should allocate resources and select communication mode appropriately. In this paper, we analyze the constraints and system equations of D2D links in scenarios with multiclass services, and propose a joint mode selection and resource allocation (JMSRA) scheme, in which interference suppression and Quality of Service (QoS) requirements are considered. The proposed scheme optimizes communication mode for each device and allocates resource according to service demands and current state of the network. Numerical results show that the proposed JMSRA scheme achieves higher system capacity than both Pure Cellular and Force D2D schemes, especially when the maximum distance between D2D pairs or system load increases. Simulation also proves that our scheme can obtain higher service satisfaction degree in the hybrid network.