An energy efficiency and ping-pong handover ratio optimization in two-tier heterogeneous networks

With the significant data explosion, the demand of broadband wireless communication networks, especially the need of wireless broadband service coverage and the wireless access quality, energy consumption of information and communication technology (ICT) has exponentially increased in recent years. However, the growing complexity of network caused many mobility management problems. This paper proposed a new self-optimization based handover algorithm, which aim at improving the system energy efficiency and Ping-pong handover ratio. The main concept of this proposed algorithm dynamically selects two handover control parameters: Time-to-Trigger (TTT) and Hysteresis Margin (HM) based on the current network energy efficiency states ERG (Energy Reduction Gain), Signal to Interference plus Noise Ratio (SINR) and Ping-pong handover ratio. Based on these system performance, the system will automatically modify the handover parameters to yield a better network performance.