LTE-A中异构网络的切换分析

Analysis of Handover Process for Heterogeneous Network in LTE-A

在传统网络数据流量爆发性增长、频谱效率已接近极限值的形式下,异构组网是增加网络容量、提高数据速率的有效方式。LTE-A系统中异构组网引入低功率节点,缩短了网络与用户间距离,提高了无线链路质量和频谱效率,逐渐成为LTE-A系统中的关键技术之一,但同时也带来复杂的移动性管理等问题。在深入分析3GPP E-UTRA协议规范的基础上,首先建立了LTE-A MacroPico异构网络拓扑模型,然后对Macro-to-Pico和Pico-to-Macro双向切换概率进行了分析和仿真。在此基础上,给出了用户及其相关网络参数对于切换成功概率的影响分析。

Since the data traffic is growing so rapidly and the spectrum efficiency is close to the limitation of traditional network ,heterogeneous network is becoming an effective way to increase the network capacity and data rate. In LTE-A system, the network introduces low power nodes, shortening the distance between the network equipment and terminal user,then improves the wireless link quality and spectrum efficiency. Currently,heterogeneous networking is becoming one of the key technologies in LTE-A system, but as a result, brings complicated mobility management issues. This paper tries to establish the LTE-A Maero-Pieo heterogeneous network mobility model through the deep analysis of 3GPP E-UTRA specifications. It analyzes and simulates the ＂from Macro-to-Pieo to Pico-to-Macro＂ dual-direction handover probability,then derives the impact of user＇s moving speed and other network parameters on the handover success probability.