Mobile users in an ultra-dense millimeter-wave cellular network experience handover events more frequently than in conventional networks, which results in increased service interruption time and performance degradation due to blockages. Multi-connectivity has been proposed to resolve this, and it also extends the coverage of millimeter-wave communications. In this paper, we propose a dual-connection based handover scheme for mobile UEs in an environment where they are connected simultaneously with two millimeter-wave cells to overcome frequent handover problems. This scheme allows a mobile UE to choose its serving link between the two mmWave connections according to the measured SINRs and then the corresponding base stations may forward duplicate packets to the UE. We compare our dual-connection based scheme with a conventional single-connection based scheme through ns-3 simulation. The simulation results show that the proposed scheme significantly reduces handover rate and delay. Therefore, we argue that the dual-connection based scheme helps mobile users achieve performance goals they require in ultra-dense cellular environments.
翻译:超重毫米蜂窝网络的流动用户比常规网络更经常地经历交接事件,这导致服务中断时间增加,因阻塞导致性能退化。为了解决这个问题,提出了多连通性建议,并扩大了毫米波通信的覆盖范围。在本文中,我们提议在移动UE与两毫米波波电池同时连接的环境中,为移动UE提供基于双连接的交接计划,以克服频繁的交接问题。这个计划允许移动UE根据所测量的SINR选择其在两毫米瓦连接之间的服务连接,然后相应的基站可以将重复的包转发给UE。我们通过ns-3模拟将基于双连通的计划与基于常规的单连通计划进行比较。模拟结果表明,拟议的计划大大降低了交接率和延迟率。因此,我们说,基于双连通计划有助于移动用户在超重心蜂窝环境中达到所需的性能目标。