A method for reducing hard handoff between cells using hierarchical structure

摘要

The present invention relates to a method for reducing inter-cell hard handoff using a hierarchical structure of micro cells and macro cells.;In a CDMA mobile communication system microcell environment, the processing of hard handoff between microcells is not only very difficult compared to the processing of soft handoff between microcells, but also has a high probability of dropping calls during handoff. have.;Accordingly, in the present invention, when a hard handoff occurs between the microcells using a hierarchical structure in which the microcells and the macrocells are superimposed, the handoff is performed by converting the hard handoff between the microcells and the macrocell, which is relatively simple to process. This method can improve the performance of the system with the effect of reducing the number of handoffs between micro cells. In this case, the frequency set for the micro cell and the frequency set for the macro cell are differently allocated, and the same frequency is allocated to the macro cells, but the frequency sets within the frequency set for the micro cell are allocated to the micro cells according to the traffic amount.