Handoff Control Strategy Applied in Hierarchical Cell Structure

A handoff strategy based on the area of a cell and the bit energy to interference density ratio is proposed in this paper,which is suited for hierarchical cell structured WCDMA system.A dynamic resource reservation scheme is applied in which new calls can use the reserved resource at certain probabilities.If the system has no idle resource in originating a handover call,the queueing mechnanism is adopted.From the results of simulation,the improvement in the blocking probabilities of voice is discovered,compared with the other handoff strategy adopting the fixed resource reservation.