Higher layer performance study of power-controlled hierarchical constellation-based multi-user opportunistic scheduling

In their earlier work [1], the authors proposed a multiple best user opportunistic scheduling using power controlled hierarchical constellations and showed that the proposed scheme offers more frequent information access (almost double) to the users at the expense of certain increase in the average transmit power. As follow-up of our earlier work, in this paper, we analyze higher layer performances of the proposed two best user scheduling scheme via queuing analysis. More specifically, we analyze the buffer distribution, the average buffer occupancy, the delay distribution, and the packet loss probability of the hierarchical constellation-based multiple best user scheduling which has been proposed earlier by the authors. We then compare these higher layer performances of the hierarchical two best user scheduling with the classical single best user scheduling. Selected numerical results show that the hierarchical two best user scheduling scheme outperforms the classical single best user scheduling in terms of buffer distribution, average buffer occupancy (i.e., average buffering delay), delay distribution, and packet loss probability of the packets at the transmission buffer at the expenses of an increase in the average transmit power.