微小区交换通话处理的改进方案及性能分析

Improvement and Performance Analysis of Call Handover Procedure in Micro-Cell Systems

在第三代系统环境的微小区和微微小区中,用户的移动造成交换通话掉话的概率和新建通话被拥塞概率是决定系统QoS的重要参数.现有的一些方案虽然能够很好地处理交换通话,但都是以牺牲新建通话为代价的.为了有效解决交换通话掉话与新建通话拥塞之间的矛盾,提出了一种新的通话处理的改进方案,它是基于原有的部分保护信道方案模型,但额外地考虑了新建通话的拥塞问题.这个方案相对于普遍采用的交换通话处理方案,能够很好地提高系统的性能.最后通过对改进方案的计算机仿真,取得了比较满意的结果.

In micro-cell and micromicro-cell environment for 3G mobile communication, the probability of call handover dropping due to mobile users or congestion of new calls becomes an important parameter that determines the QoS of the system. Although there are some schemes available to improve the performance of call handover, they will all be done at the expense of sacrificing new calls. To resolve effectively the contradiction between call handover dropping and congestion of new calls, a new call admission scheme is proposed on the basis of the existing fractional guard channel scheme with the congestion of new calls taken into account. Compared to the commonly used call admission scheme, it can improve well the performance of the system. The simulation on computer showed that it is satisfactory.