Flexible Design for $\alpha$-Duplex Communications in Multi-Tier Cellular Networks. (arXiv:1511.07903v1 [cs.IT])6h
[/url][url=]






由 Ahmad AlAmmouri, Hesham ElSawy, Mohamed-Slim Alouini[url=][/url] 通过 Statistics authors/titles recent submissions[url=][/url]




Full-Duplex (FD) transceivers are expensive to implement at the users' equipment (UEs) side due to the increased complexity, power consumption, and price. Therefore, backward compatibility between FD base stations (BSs) with half-duplex (HD) UEs, without sacrificing the foreseen FD communication gain, is required. In this context, 3-node topology (3NT) is recently proposed to harvest FD gains with FD BSs with HD UEs. In this paper, we present a flexible tractable modeling framework for FD multi-tier cellular networks, which is based on stochastic geometry and accounts for different network topologies as well as the intrinsic vulnerability of uplink transmissions. The model is location aware and enables fine-grained design for the overlap between uplink and downlink channels to maximize the overall rate. To this end, the results confirm that FD UEs are not necessary for harvesting the FD gains, and hence, offloads the burden to implement the FD transceivers in the UEs. The results show that implementing FD transceivers at the UEs offers a maximum of 8% rate gain over the 3NT, which is a marginal gain compared to the burden to implement the FD transceivers at the UEs' side. To this end, we shed light on practical scenarios in which 3NT operation with FD BSs and HD UEs outperforms the 2NT operation where both FD BSs and FD UEs. Finally, we propose a location dependent mixed 3NT/2NT strategy to maximize the overall rate when UEs FD receivers with different efficiencies.