A Seamless Handover Scheme With Assisted eNB for 5G C/U Plane Split Heterogeneous Network

Ziyang Zhang,Yi Gong,Zhao Junhui,Shanjin Ni

doi:10.1109/access.2019.2952737

Abstract

Considering the frequent handover problem caused by network densification and the employment of millimeter wave (mmWave) in 5G heterogeneous networks (HetNets), we present a novel network framework for 5G control/user plane split (CUPS) network to perform seamless handover between two neighbour macro evolved nodeBs (M-eNBs). By introducing an eNB called handover assisted micro eNB (HO A-eNB) in the overlapping region, the success probability of the handover between two M-eNBs can be significantly improved. When a user equipment (UE) is performing the inter M-eNBs handover, the UE will keep the dual connectivity with the source M-eNB and the HO A-eNB. After the handover is completed, UE will keep connecting with the HO A-eNB and the former target M-eNB. By introducing HO A-eNB and redesigning the signaling procedure of inter M-eNBs handover, we can obtain better handover performance, and the reliability of communication systems can be greatly enhanced. Simulation results show that the handover outage probability is lower than that of the traditional CUPS HetNets, and the handover success probability of inter M-eNB is almost 34.7% improved.

Highlights

5G heterogeneous networks (HetNets) have been recognized as one of the promising solutions to solve the unprecedented technical challenges existing in the current networks, which can provide the seamless high-rate communication services for mobile user equipments (UEs) [1]
We propose a novel network structure and handover mechanism for the control/user plane split (CUPS)-based architecture of 5G HetNets, and a handover assisted micro eNB (HO A-eNB) carrying some control signaling in the overlapping region of two neighbour macro evolved nodeBs (M-eNBs) is introduced to improve the handover success probabilities
received signal strength (RSS), received signal qualities, as well as the trigger probability and the success probability of inter M-eNBs handover will be analysed by numerical simulation

Summary

Introduction

We propose a novel network structure and handover mechanism for the CUPS-based architecture of 5G HetNets, and a handover assisted micro eNB (HO A-eNB) carrying some control signaling in the overlapping region of two neighbour M-eNBs is introduced to improve the handover success probabilities. Based on CUPS network architecture, our proposed scheme introduces an HO A-eNB into the overlapping region areas to realize the soft handover between the two neighbouring M-eNBs, and the HO A-eNB mainly transmits the UE data and some control signaling.

Results

Conclusion