一種雙層小區(qū)結(jié)構(gòu)中的切換控制策略

在寬帶碼分多址雙層小區(qū)結(jié)構(gòu)系統(tǒng)中提出了一種基于小區(qū)覆蓋范圍和信號(hào)能干比判決的切換策略，切換策略使用了基于概率的動(dòng)態(tài)資源預(yù)留方案，即在切換時(shí)，如果系統(tǒng)中沒(méi)有空閑資源，則對(duì)切換呼叫進(jìn)行排隊(duì)。通過(guò)仿真表明，該切換策略相對(duì)于采用固定資源預(yù)留的切換策略，在輕負(fù)荷的條件下對(duì)話音呼叫的阻塞概率有一定的改善。
關(guān) 鍵 詞 寬帶碼分多址; 切換; 雙層小區(qū)結(jié)構(gòu); 能干比; 資源預(yù)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