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.
翻译:我们考虑在一个多细胞多投入多输出(MIMO)系统中在线无线网络虚拟化(WNV),该系统有频道状态信息的延迟反馈。多个服务提供商(SPs)同时共享一个基础设施供应商(InP)的基础站资源。我们的目标是通过管理SP之间和跨细胞之间的干扰,尽量减少InP的实际预编码偏离SP虚拟化要求的累积预编码。我们开发了一个在线协调的预编码解决方案,并显示它提供了可识别的性能界限。我们的预编码解决方案完全分布在每个单元格,仅以延迟的本地 CSI为基础。此外,它有一个封闭式的表达形式,其计算复杂性较低。最后,模拟结果表明我们预编码解决方案在目前最佳的替代品上取得了巨大的绩效收益。