Network coding schemes for Device-to-Device communications based relaying for cellular coverage extension

Abstract

Abstract-Although network assisted device-to-device (D2D) communications is known to improve the spectral and energy efficiency of proximal communications, its performance is less understood when employed to extend the coverage of cellular networks. In this paper, we study the performance of D2D based range extension in terms of sum rate and power efficiency when a relaying user equipment (UE) helps to improve the coverage for cell-edge UEs. In our design, the relaying UE has own traffic to transmit and receive to/from the cellular base station (BS) and can operate either in amplify-and-forward (AF) or decodeand-forward (DF) modes and can make use of either digital or analogue (PHY layer) network coding. In this rather general setting, we propose mode selection, resource allocation and power control schemes and study their performance by means of system simulations. We find that the performance of the DF scheme with network coding is superior both to the traditional cellular and the AF based relaying schemes, including AF with two-slot or three-slot PHY layer network coding.

An Overview of Device-to-Device Communications Technology Components in METIS

“…Although D2D for coverage extension is a key application in NSPS situations, further research is required into radio resource management algorithms to handle the traffic of the relaying device as well as the peer devices [12], [13]. Cooperating devices using limited feedback can also realize distributed or collaborative beamforming over multiple relaying devices and jointly achieve multiple-input singleoutput (MISO) beamfoming for cellular coverage extension.…”

“…In such a scheme D2D communications are used to achieve spatial diversity among multiple devices without requiring that an antenna array be present at each node [14], [15]. As observed in, for example, [13], when D2D communications are used to extend the coverage and improve the quality of cellular services, user equipment temporarily become part of the infrastructure.…”

Device-to-Device Communications for 5G Internet of Things

“…In particular, network assisted two-hop D2D communications enhances the coverage and the energy efficiency of cellular networks and can be useful in providing national security and public safety services [63] [64] [65]. In a recent paper also multi-cell cellular systems have been modeled where UEs assist cell-edge users for relaying, and different approaches (amplify-andforward and decode and-forward with either digital or analogue network coding) are compared to optimize the system performance [66]. Although the focus so far has been mainly on downlink services; uplink direction scenarios are of undoubted interest as witnessed by recent publications, such as [67], where relaying by smartphones is proposed to send out emergency messages from disconnected areas.…”

Transmit power optimization for relay-aided multi-carrier D2D communication

“…To whom correspondence should be addressed. Manuscript received: 2016-09-23; revised: 2016-12-26; accepted: 2016- [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] issues, a new technology known as device-to-device (D2D) communication was introduced [4,5] . In D2D communication, two users can directly communicate with each other without requiring BS involvement by sharing the spectrum with other cellular users in an underlay transmission mode.…”