While scalable cell-free massive MIMO (CF-mMIMO) shows advantages in static conditions, the impact of its changing serving access point (AP) set in a mobile network is not yet addressed. In this paper we first derive the CPU cluster and AP handover rates of scalable CF-mMIMO as exact numerical results and tight closed form approximations. We then use our closed form handover rate result to analyse the mobility-aware throughput. We compare the mobility-aware spectral efficiency (SE) of scalable CF-mMIMO against distributed MIMO with pure network- and UE-centric AP selection, for different AP densities and handover delays. Our results reveal an important trade-off for future dense networks with low control delay: under moderate to high mobility, scalable CF-mMIMO maintains its advantage for the 95th-percentile users but at the cost of degraded median SE.
翻译:虽然可伸缩的无细胞大型MIMO(CF-mMIMO)在静态条件下显示出优势,但它在移动网络中设定的不断变化的服务接入点(AP)的影响尚未得到解决,在本文件中,我们首先得出可伸缩的CFMIMIM(CF-mMIMO)的CPU集群和AP交接率,作为精确的数字结果和紧密封闭形式的近似值。然后我们用封闭形式的交接率来分析移动性能吞吐量。我们将可伸缩的CFMIMO与分布式MIMO(SE)的移动性觉光谱效率与纯网络和以UE中心为主的AP(AP)选择相进行比较,因为不同的AP密度和交接延迟。我们的结果显示,对于未来的密度网络来说,在低控制延迟的情况下,CFMIMIMO(C)在中度至高流动性下保持其对95个中位用户的优势,但以退化的SE中位成本为代价。