Online Distributed Coordinated Precoding for Virtualized MIMO Networks with Delayed CSI

TL;DR

This paper proposes a distributed online precoding method for multi-cell MIMO networks with delayed CSI, effectively managing interference and power constraints to optimize virtualization demands, with proven performance bounds and low complexity.

Contribution

It introduces a novel distributed online precoding algorithm for virtualized MIMO networks with delayed CSI, providing performance guarantees and low computational complexity.

Findings

Significant performance improvement over existing methods

Provable bounds on precoding deviation

Low-complexity closed-form solution

Abstract

We consider online wireless network virtualization (WNV) in a multi-cell multiple-input multiple output (MIMO) system with delayed feedback of channel state information (CSI). Multiple service providers (SPs) simultaneously share the base station resources of an infrastructure provider (InP). We aim at minimizing the accumulated precoding deviation of the InP's actual precoder from the SPs' virtualization demands via managing both inter-SP and inter-cell interference, subject to both long-term and short-term per-cell transmit power constraints. We develop an online coordinated precoding solution and show that it provides provable performance bounds. Our precoding solution is fully distributed at each cell, based only on delayed local CSI. Furthermore, it has a closed-form expression with low computational complexity. Finally, simulation results demonstrate the substantial performance gain of our precoding solution over the current best alternative.