Full duplex device to device communication in cellular networks

Abstract

In this paper, we investigate the performance improvements of single band full duplex device to device communication that can transmit and received on the same frequency band in cellular networks. In cellular networks, two separate frequencies are used to enable simultaneous transmission and reception for half duplex radios. Recently, full duplex radios that allows a wireless node to simultaneously transmit and receive in one frequency band were proposed. It was shown that it was effective for short-range communications. As such, full duplex communication is adequate for device to device (D2D) communication, which is usually a short range communication. Device to device communication is an underlay scheme for cellular networks that enables peer-to-peer local services with limited impact on the primary cellular network. When user devices are closer to each other than the base station, D2D communication can improve the bandwidth efficiency of the communication between the users. When full duplex communication is adopted for D2D communication, it requires only one frequency band for two way communication between the local users. It improves the bandwidth efficiency for D2D communication. We propose a simple full duplex D2D communication protocol and analyze the bandwidth performance gain of the protocol compared to the legacy cellular communication scheme.