Changes in the difference between received levels of sector antenna

In mobile communication systems, the difference between the received level of an existing sector and that of a neighboring sector changes over a wide range, handover and soft-handover occur frequently, and a significant load is applied to the base station control. In this report, we aim to clarify the stochastic characteristics of the difference between the received levels of the sector antenna in order to control handover appropriately. Furthermore, we propose a model of the changes in the incoming waves to evaluate the handover threshold. The proposed model is the angle profile expressed by the Laplacian function where each wave has a lognormal distribution. The difference in the received levels calculated using the proposed model agrees well with the results calculated using measured angle profiles.