Device-to-device (D2D) communications underlaying a cellular infrastructure is regarded as one of the key technology enablers for future wireless networks. The main advantages of underlay D2D communications stem from the reuse-, proximity-, and hop gains, which can be utilized for enhanced coverage, capacity and quality-of-service in mobile networks. The basic idea consists in enabling suitably...

Low-power machine-type communications devices in machine-to-machine networks are expected to operate autonomously for years, or even decades. Meanwhile, device-to-device (D2D) communications make large benefits on users’ data rate and power consumption because of the proximity between potential D2D transmitters and receivers. In this paper, we facilitate machine-type D2D links where the machine...

The goal of this paper is to present advances on recent 3GPP standardization activities related to Device-to-Device (D2D) and public safety. The paper provides a clear 3GPP state of the art, including when the 3GPP work on D2D and public safety communications started. Finally, it presents important conclusions with respect to further 3GPP work on this topic.

Multimedia services over mobile device-to-device (D2D) networks has recently received considerable attention. In this scenario, each device is equipped with a cellular communication interface, as well as a D2D interface over a shared medium. In this work, we study the performance properties of the mobile D2D communications in the framework of user satisfaction, and develop a fully distributed Q...

Channel state information (CSI) feedback is a challenging issue in frequency division multiplexing (FDD) massive MIMO systems. This paper studies a cooperative feedback scheme, where the users first exchange their CSI with each other by exploiting device-to-device (D2D) communications, then compute the precoder by themselves, and feed back the precoder to the base station (BS). Analytical resul...

The reference scenario in this paper is a single cell in a Long Term Evolution-Advanced (LTE-A) system, where multiple user equipments (UEs) aim at uploading some data to a central server or to the Cloud. The traditional uploading technique used in cellular systems, i.e., with separate links from each UE to the eNodeB, is compared to innovative relay-based schemes that exploit Device-to-Device ...

1 Abstract—Network-controlled device-to-device (D2D) communication allows cellular users to communicate directly, i.e., without passing through the eNodeB, while the latter retains control over resource allocation. This allows the same time-frequency resources to be allocated to spatially separated D2D flows simultaneously, thus increasing the cell throughput. This paper presents a framework fo...

Network assisted device-to-device (D2D) communication can increase the spectrum and energy efficiency of proximity communication sessions in cellular networks. For cellular networks supporting D2D communications, network coding (NWC) has been proposed as a means to further increase the spectral and energy efficiency. Specifically, 2 time slot (2-TS) NWC has been shown to be a viable complement ...

This letter investigates the resource allocation problem in device-to-device (D2D) communications underlaying a non-orthogonal multiple access (NOMA)-based cellular network, where both cellular users and D2D users harvest energy from the hybrid access point in the downlink and transmit information in the uplink. We propose a low-complexity iterative algorithm to maximize the energy efficiency o...

This chapter investigates the interplay between cooperative device-to-device (D2D) communications and green communications in LTE heterogeneous networks (HetNets). Two game theoretic concepts are studied and analyzed in order to perform dynamic HetNet base station (BS) on/off switching. The first approach is a coalition-based method whereas the second is based on the Nash bargaining solution. A...