CDMA移动通信系统软切换双队列模式的研究

Study of Soft-Handover of Double Queues Model in CDMA Mobile Communication Network

CDMA移动通信系统软切换的双队列模式根据移动用户在切换区中运动方向变化情况,把软切换请求分为真正的切换请求和虚假的切换请求,并分别储存在主队列和从队列中,尽量减少有用虚假切换请求的丢失,有效地利用资源、合理地节省资源,缓解呼叫拥塞和切换拥塞,提高系统性能.通过计算机仿真并与基于方向的排队算法比较,结果表明:该模型硬件实现简单,软件实现方便;主队列具有很低的呼损率、较少的软切换等待时间和较短的排队长度,大大提高了CDMA移动通信系统的服务质量.

A double queues model of soft-handover in CDMA mobile communication networks has been proposed. The model divides the soft-handover call into real soft-handover call and false soft-handover call and stores them in main queue and in following queue differently, so that the drop ratio of useful false soft-handover call has been decreased, and the system resource can be utilized and saved effectively,Moreover, the congestion of call and soft-handover can be eliminated ,and the system performance can be improved. The method was simulated and compared with queue model basing on direction on an experimental system, It is proved that the model can reduce complexity and cost in hardware, and be used in software easily. Also dose it make the soft-handover waiting time of main queue very less and the length in main queue very short, and make the call drop ratio least. The QoS in CDMA mobile communication networks has been improved quickly.