Device-to-Device (D2D) communications is a term used to describe the new technology that allows two devices to communicate with each other directly, without using the base stations or the access points of the network infrastructure. D2D communication leads to better network performance for a number of reasons. Among the challenges of D2D communications are, the discovery of a new D2D communicat...

In this work we propose a roadmap towards the analytical understanding of Device-to-Device (D2D) communications in LTE-A networks. Various D2D solutions have been proposed, which include inband and outband D2D transmission modes, each of which exhibits different pros and cons in terms of complexity, interference, and spectral efficiency achieved. We go beyond traditional mode optimization and m...

Device-to-device (D2D) communications underlaying cellular networks are considered to be promising communication modes to improve network radio resource efficiency and provide higher transmission data rates to devices close to each other. However, when D2D communications reuse cellular resources, the resulting interference will cause significant performance loss to cellular users. In this paper...

In current cellular networks the demand of traffic is rapidly increasing and new techniques need to be developed to accommodate future service requirements. Device-to-Device (D2D) communications is one technique that has been proposed to improve the performance of the system by allowing devices to communicate directly without routing traffic through the base station. This technique has the mean...

In spite of its potential advantages, the large-scale implementation of the device-to-device (D2D) communications has yet to be realized, mainly due to severe interference and lack of enough bandwidth in the microwave (μW) band. Recently, exploiting the millimeter wave (mmW) band for D2D communications has attracted considerable attention as a potential solution to these challenges. However, it...

The proliferation of heterogeneous devices connected through large-scale networks is a clear sign that the vision of the Internet of Things (IoT) is getting closer to becoming a reality. Many researchers and experts in the field share the opinion that the next-to-come fifth generation (5G) cellular systems will be a strong boost for the IoT deployment. Device-toDevice (D2D) appears as a key com...

We consider the problem of joint power control, signal-to-noise-and-interference-ratio (SINR) target setting, mode selection and resource allocation for cellular network assisted device-to-device (D2D) communications. This problem is important for fourth generation systems, such as the release under study of the Long Term Evolution Advanced (LTE-A) system standardized by the Third Generation Pa...

In this paper, we investigate the coexistence of two technologies that have been put forward for the fifth generation (5G) of cellular networks, namely, network-assisted device-to-device (D2D) communications and massive MIMO (multiple-input multiple-output). Potential benefits of both technologies are known individually, but the tradeoffs resulting from their coexistence have not been adequatel...

Hybrid networks consisting of both millimeter wave (mmWave) and microwave (μW ) capabilities are strongly contested for next generation cellular communications. A similar avenue of current research is deviceto-device (D2D) communications, where users establish direct links with each other rather than using central base stations (BSs). However, a hybrid network, where D2D transmissions coexist, ...

Exploiting direct transmissions between geographically close mobile users without passing through the base stations (BSs), device-to-device (D2D) communications contribute significant improvement to the spectral efficiency of cellular networks. In D2D assisted cellular networks, the social interaction of mobile users is an important property that will affect the practical performance and should...