WLC46-4: Closed Loop Cross Layer Scheduling for Goodput Maximization with No CSIT

Abstract

In wireless networks with centralized base station, cross layer scheduling to adapt user selection, power allocation and rate allocation can achieve a tremendous gain due to multiuser selection diversity. However, conventional cross layer designs all require channel state information at the base station (CSIT), which is difficult to obtain in practice. In this paper, we propose a closed loop cross layer design with no CSIT. The optimal power, rate allocation and user selection has high complexity as it involves stochastic programming. Instead, we would like to focus on two suboptimal algorithms, namely CP-TX and OP, which are based on ACK/NAK feedbacks from selected mobiles. Under practical circumstances, OP can achieve more than 88% goodput of the optimal algorithm.