Multicast Transmissions in Directional mmWave Communications
Conference: European Wireless 2017 - 23th European Wireless Conference
05/17/2017 - 05/19/2017 at Dresden, Germany
Proceedings: European Wireless 2017
Pages: 7Language: englishTyp: PDFPersonal VDE Members are entitled to a 10% discount on this title
Biason, Alessandro; Zorzi, Michele (Department of Information Engineering, University of Padova, via Gradenigo 6b, 35131 Padova, Italy)
Multicast transmissions have been widely analyzed in traditional networks as a way to improve spectrum efficiency when multiple users are interested in the same data. However, their application to mmWave communications has been studied only marginally so far. The goal of this paper is to partially fill this gap by investigating optimal and suboptimal multicast schemes for mmWave communications with directional beams. In particular, we propose a Markov setup to model the retransmission status of the unsuccessfully transmitted packets and, because of the computational complexity of the optimal solution, we introduce a suboptimal hierarchical optimization procedure, which is much easier to derive. Finally, we numerically show that restricting the link to unicast beams is suboptimal, especially when many packets have to be transmitted.