Handover scheme with enode-B pre-selection and parameter self-optimization for LTE-A heterogeneous networks

摘要

For a heterogeneous network (HetNet) with macro and pico eNode Bs (eNBs) in the long term evolution (LTE) system or LTE-Advanced (LTE-A) system, an eNB pre-selection strategy is first proposed in this paper so that high-speed user equipments (UEs) are primarily taken care by macro eNBs while low-speed UEs or UEs with low quality of service (QoS) requirements are offloaded to the service area of pico eNBs to share the load of macro eNBs. Additionally, a dynamic handover parameter adjustment mechanism is proposed by considering the handover failure ratio, ping-pong ratio, speed, and mobility history etc. Finally, we show the superiority of our design over some related schemes reported in the literature in terms of number of handover, radio link failure ratio, packet loss ratio, and ping-pong ratio via simulations.