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HeNB-aided virtual-handover for range expansion in LTE femtocell networks

机译：HeNB辅助的虚拟切换，用于LTE飞蜂窝网络中的范围扩展

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摘要

Home evolved Node-B (HeNB), also called a femtocell or a femto base station, is introduced to provide high data rate to indoor users. However, two main problems arise in femtocell networks: (1) Small coverage area of HeNB, which results in limited cell-splitting gain and ping-pong handover (HO) problems and (2) high inter-femtocell interference because HeNBs may be densely deployed in a small region. In this study, an efficient cooperation mechanism called an HeNB-aided virtual-HO (HaVHO) scheme is proposed to expand the coverage area of femtocells and to reduce inter-femtocell interference. The cooperation among neighbor HeNBs is exploited in HaVHO by enabling an HeNB to relay the data of its neighbor HeNB without an HO. The HaVHO procedure is compatible with the existing long term evolution specification, and the information exchange overhead in HaVHO is relatively low. To estimate the signal to interference plus noise ratio improvement, the area average channel state metric is proposed, and the amount of user throughput enhancement by HaVHO is derived. System-level simulation shows that HaVHO has a better performance than the other four schemes, such as lesser radio link failure, lesser ping-pong handover, lesser short-stay handover, and higher user throughput.
机译：引入了家庭演进节点-B（HeNB），也称为毫微微小区或毫微微基站，以向室内用户提供高数据速率。然而，在毫微微小区网络中出现两个主要问题：（1）HeNB的覆盖范围较小，这会导致有限的小区分裂增益和乒乓切换（HO）问题；以及（2）由于HeNB可能密集而导致毫微微小区之间的干扰部署在一个很小的区域。在这项研究中，提出了一种有效的协作机制，称为HeNB辅助虚拟HO（HaVHO）方案，以扩大毫微微小区的覆盖范围并减少毫微微小区之间的干扰。在HaVHO中，通过使HeNB无需中继即可中继其邻居HeNB的数据，从而在HaVHO中利用了邻居HeNB之间的协作。 HaVHO程序与现有的长期演进规范兼容，并且HaVHO中的信息交换开销相对较低。为了估计信噪比和噪声比的改善，提出了面积平均信道状态度量，并推导了通过HaVHO增强的用户吞吐量。系统级仿真显示，HaVHO具有比其他四种方案更好的性能，例如更少的无线电链路故障，更少的乒乓切换，更少的短时切换以及更高的用户吞吐量。

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