A Multi-Attribute Handover Algorithm for QoS Enhancement in Ultra Dense Network

Abstract

Ultra-dense networks (UDNs) have been known as an efficient method to satisfy tremendous traffic demands in future mobile networks. With high density deployment of small base stations (SBSs), mobile user equipments (UEs) will suffer frequent and unnecessary handovers (HOs) which severely degrade the quality of service (QoS) and/or quality of experience (QoE). To solve this problem, we propose a novel multi-attribute mobility management strategy according to link reliability level and throughput requirement. In particularly, the reference signal received quality (RSRQ) and speed of UE are taken into account for the link reliability index. Besides, the minimum throughput is considered for guaranteeing QoS requirement of users. The UE reconnects the target small cell with the highest priority, which are calculated according to link index, QoS index, and corresponding weights. The goal of proposed mobility management scheme is to improve HO performance and QoS of UEs. Extensive simulation experiences with different traffic types are evaluated and the simulation results indicate the effectiveness of our mobility management strategy in terms of throughput and HO delay.