Increasing the deployment density of small base stations (SBS) is a key method designed to satisfy high data traffic in 5th generation mobile network (5G). However, a large number of SBSs in such ultra-dense network (UDN) may cause ping-pong handovers (HOs), accompanied by increased delay and HO failure. In addition, because of the separation of control and data signaling in 5G, the HO procedure must be performed in both layers. In this paper, we introduce an SDN-based intelligent dynamic HO parameter optimization strategy to minimize both HO failures and ping-pong HOs together. The goal of the proposed strategy is to reduce the HO failure rate and redundant HO (i.e. ping-pong HO) while enabling user equipment (UE) to make full use of the benefits of dense deployment of BSs. Simulation results present that the method proposed in this paper effectively suppresses the ping-pong effect and keeps it at a low level in all of the investigated scenes. In addition, compared with the other algorithms, the HO failure rate is significantly reduced and the throughput of UE is greatly increased, especially in the case of high BS density. Therefore, the benefits of intensive BS deployment are retained.

中文翻译：

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SDN UDN自适应切换参数优化


增加小型基站（SBS）的部署密度是满足第五代移动网络（5G）高数据流量的关键方法。然而，这种超密集网络（UDN）中的大量SBS可能会导致乒乓切换（HO），并伴随着延迟增加和HO失败。此外，由于5G中控制和数据信令的分离，HO过程必须在两个层中执行。在本文中，我们介绍了一种基于SDN的智能动态HO参数优化策略，以最大限度地减少HO故障和乒乓HO。所提出策略的目标是降低HO故障率和冗余HO（即乒乓HO），同时使用户设备（UE）能够充分利用BS密集部署的优势。仿真结果表明，本文提出的方法有效地抑制了乒乓效应，并将其在所有研究场景中保持在较低水平。此外，与其他算法相比，HO失败率显着降低，UE的吞吐量大幅提高，尤其是在基站密度较高的情况下。因此，基站密集部署的优势得以保留。