双连接架构与关键技术分析

Architecture and Technical Analysis of Dual Connectivity

现有的基站内载波聚合和多点协作传输技术均使用理想回程传输数据,且为提高流量容量和数据速率,导致宏小区内部署的小小区热点不断增加。3GPP在R12阶段的长期演进(LTE)异构网中提出小小区增强技术,于是采用非理想回程且能够连接两个以上基站的双连接技术应运而生,尤其是在密集小小区部署中。因此,从用户平面和控制平面描述协议栈架构的场景部署,并从各个场景所面临的挑战和技术细节,对双连接技术的设计实现进行详细分析,以期提供相关理论参考。

Existing intra-e NB CA and Co MP architectures both assume the ideal back haul; and for raising the traffic capacity and data rate, this could lead to the growing deployment of small cells-as hotspots within the macro cell coverage. Thus the dual connectivity is proposed by 3GPP in Rel-12 for enhancement of small cell with non-ideal back-haul in long-term evolution（LTE） heterogeneous network, particulary with the denser small cell deployment,where a given UE consumes radio resources provided by at least two different network points. For this, the scenarios deployment of protocol stack architecture is described from user level and control level, and also from the challenges faced by each scenario and technical details, the design and implementation of dual-connection technology analyzed, and thus expecting to provide a related theoretical reference.