Harvesting full-duplex rate gains in cellular networks with half-duplex user terminals

Abstract

Abstract-Full-Duplex (FD) transceivers may be expensive in terms of complexity, power consumption, and price to be implemented in all user terminals. Therefore, techniques to exploit in-band full-duplex communication with FD base stations (BSs) and half-duplex (HD) users' equipment (UEs) are required. In this context, 3-node topology (3NT) has been recently proposed for FD BSs to reuse the uplink (UL) and downlink (DL) channels with HD terminals within the same cell. In this paper, we present a tractable mathematical framework, based on stochastic geometry, for 3NT in cellular networks. To this end, we propose a design paradigm via pulse-shaping and partial overlap between UL and DL channels to maximize the harvested rate gains in 3NT. The results show that 3NT achieves a close performance to networks with FD BSs and FD UEs, denoted by 2-node topology (2NT) networks. A maximum of 5% rate loss is reported when 3NT is compared to 2NT with efficient self-interference cancellation (SIC). If the SIC in 2NT is not efficient, 3NT highly outperforms 2NT. Consequently, we conclude that, irrespective to the UE duplexing scheme, it is sufficient to have FD BSs to harvest FD rate gains.Index Terms-Full duplex, half duplex, stochastic geometry, network interference, ergodic rate.

Flexible Design for α-Duplex Communications in Multi-Tier Cellular Networks

“…Three special cases of interest for f Hs (•) are considered, namely, constant attenuation where f Hs (•) is a degenerate distribution as in [14], [17], [35] and random attenuation where f Hs (•) is an exponential distribution as in [24] and Rician fading as in [26] which captures the previous two cases as special cases. It is shown in [1] that all distributions leads to the same performance trends.…”

“…Beside simplifying the analysis, the PPP assumption for abstracting cellular BSs is verified by several experimental studies [9], [10], [28]. UEs are distributed according to a PPP Φ u , which is 1 In this work we assume that both the BSs and the UEs are equipped with a single antenna. Combining FD with multiple-input and multiple-output (MIMO) transmitters is covered in [26], [27].…”

Full Duplex emulation via spatial separation of Half Duplex nodes in a planar cellular network

“…That is, the UL and DL time slots, which conventionally should take place at separate time intervals, are now overlapping, an approach used by the Rapid On-Off Division Duplexing (RODD) in [6]. The authors of [7] consider the physical UL and DL channels themselves, and have them overlap. Compared to these approaches, CoMPflex takes advantage of the spatial dimensions in a cellular network.…”