An effective handover scheme in heterogeneous networks

Starting from 3rd Generation Partnership Projects (3GPP), heterogeneous network (HetNet) is widely deployed to solve the weak-coverage problems in hot spots, architectural barriers spots and large inner buildings. HetNet consists of macro base station (MBS) with strong transmission capacity and low power Pico base station (PBS) which are set up in these weak-coverage areas and provide greater bandwidth and higher data rates for users. HetNet are also considered as the important components of 5G wireless systems. In this paper, we introduce motion trajectory models for mobile user equipment (MUE) to provide basis of the handover simulation, and then we introduce an effective handover scheme based on the prediction of the UE motion curve and the pre-handover mechanism. We theoretically analysis the proposed scheme and simulate the scheme in 3GPP architecture. Simulation results validate the analytical results and prove that the proposed scheme avoid unnecessary handover especially for high-speed MUE, resulting in a lower handover failure (HOF) probability, fewer handover total times and larger system throughput, compared with original 3GPP scheme.