在宽带码分多址双层小区结构系统中提出了一种基于小区覆盖范围和信号能干比判决的切换策略，切换策略使用了基于概率的动态资源预留方案，即在切换时，如果系统中没有空闲资源，则对切换呼叫进行排队。通过仿真表明，该切换策略相对于采用固定资源预留的切换策略，在轻负荷的条件下对话音呼叫的阻塞概率有一定的改善。关 键 词 宽带码分多址; 切换; 双层小区结构; 能干比; 资源预留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
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