dietcha
2012-05-27, 10:21 AM
The 3GPP is defining the next generation radio access network which introduces advanced self- optimization to reduce the operational efforts and complexity. It is also of interest to minimize operational effort by introducing self-optimizing mechanisms. Optimization of the handover parameters is an important goal of LTE-Advanced. In this paper, a new self- optimizing handover algorithm based on the estimation of the number of cell-boundary crossings is proposed. The algorithm adjusts the handover parameters, such as Time- to-Trigger, measurement interval, and hysteresis, by comparing the number of cell-boundary crossings and the number of handovers UE performed in a period. To optimize the handover performance further, an adaptive L3 filter based on the UE's velocity is proposed in this paper. A typical application scenario of this algorithm is high/medium speed environment under multi-service provisioning. The simulation results shows that the algorithms proposed in this paper have a better performance in the rate of ping-pong handovers and the average number of handovers.