论文标题
以用户为中心的合作传输的超密集网络的交通工具
User-Centric Cooperative Transmissions-enabled Handover for Ultra-Dense Networks
论文作者
论文摘要
以用户为中心的合作传输提供了一种令人信服的方法，以减轻超密集网络（UDNS）中越来越多的随机部署基站（BSS）引起的频繁移交。本文提出了一种新的基于以用户为中心的合作传输方案，即小组式移交（GCHO）方案，目的是降低UDN中的移交率。在拟议的方案中，合作集群的边界取决于用户设备（UE）和合作BSS之间的距离。新方案捕获了由随机分布的BS产生的合作群集拓扑的动态性和不规则性。基于将BSS位置建模为毒点过程（PPP）的随机几何工具，我们通过任意运动轨迹得出UE的移交速率的分析表达。此外，提出了一种GCHO跳过（GCHO-S）方案，以最大程度地减少切换成本，即，以用户为中心的合作传输场景中浪费的时间百分比。数值结果表明，与传统的单个BS关联和固定区域合作网络拓扑切换方法相比，GCHO方案将切换率降低了42.3％和72.7％。此外，在相同的组细胞尺寸和恒定速度下，GCHO-S方案在GCHO方案中降低了50％的交换成本。
The user-centric cooperative transmission provides a compelling way to alleviate frequent handovers caused by an ever-increasing number of randomly deployed base stations (BSs) in ultra-dense networks (UDNs). This paper proposes a new user-centric cooperative transmissions-based handover scheme, i.e., the group-cell handover (GCHO) scheme, with the aim of reducing the handover rate in UDNs. In the proposed scheme, the boundary of the cooperating cluster depends on the distance among the user equipment (UE) and cooperating BSs. The new scheme captures the dynamicity and irregularity of the cooperating cluster topology resulting from randomly distributed BSs. Based on stochastic-geometry tools where BSs locations are modeled as the Poison point process (PPP), we derive an analytical expression of the handover rate for the UE with an arbitrary movement trajectory. Furthermore, a GCHO skipping (GCHO-S) scheme is proposed to minimize the handover cost, i.e., the percentage of time wasted in handover signaling in user-centric cooperative transmissions scenarios. The numerical results show that the GCHO scheme decreases the handover rate by 42.3% and 72.7% compared with the traditional single BS association and fixed-region cooperative network topology handover approaches, respectively. Moreover, under the same group-cell size and constant velocity, the GCHO-S scheme diminishes the handover cost by 50% against the GCHO scheme.
