基于最优QoS的多级蜂窝网络最优速度门限算法

由于多级蜂窝网络系统容量大,频谱利用率高并可实现负载平衡,因而近年来受到广泛关注。由于网络层选所用的速度门限对系统性能的影响很敏感,所以选择合适的速度门限非常重要。传统的方法通过历史资料设定固定速度门限,然后每隔一段时间由历史资料进行更新。其主要缺陷在于不能及时根据业务量的波动而动态调整速度门限,且往往没有同时考虑宏、微蜂窝层的服务质量(QoS)。为此,本文通过定义一个适用于多级蜂窝网络层选的服务质量,提出了一种计算不同业务量下动态确定最优速度门限的方法。

A New Optimal Velocity Threshold Algorithm Based on Optimal QoS of HCS

As mobile telephone traffic demands increase in the future, interest in cellular systems with a hierarchical structure will grow. Hierarchical systems can provide high system capacity, efficient channel utilization, and an inherent load-balancing capacity. Normally the fixed velocity threshold is decided and adjusted on the bas is of historical datum, but it has the drawback that the dynamic behavior of the system is not taken into account. So how to determine the optimal value of the velocity threshold is important. This paper gives a new way of determining the velocity threshold based on QoS (quality of service) according to the traffic load. QoS is considered both for MacroLayers and MicroLayers.