在寬帶碼分多址雙層小區結構系統中提出了一種基于小區覆蓋范圍和信號能干比判決的切換策略，切換策略使用了基于概率的動態資源預留方案，即在切換時，如果系統中沒有空閑資源，則對切換呼叫進行排隊。通過仿真表明，該切換策略相對于采用固定資源預留的切換策略，在輕負荷的條件下對話音呼叫的阻塞概率有一定的改善。
關 鍵 詞 寬帶碼分多址; 切換; 雙層小區結構; 能干比; 資源預留

Abstract 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.
Key words wideband code division multiple access; handoff; hierarchical cell structure; bit energy to interference density ratio; resource reservation