分层蜂窝网络的层间联合建模与性能分析  

Layer-United Modeling and Performance Analysis of Hierarchical Cellular Network

作　　者：刘莉[1] 荆涛[1] 付立[1] 

机构地区：[1]北京交通大学电子信息工程学院,北京100044

出　　处：《系统仿真学报》2007年第8期1857-1862,共6页Journal of System Simulation

基　　金：国家自然科学基金(60472034)

摘　　要：分层蜂窝结构(HCS)已经成为第三代移动系统的一个主要发展要求。一个应用双向溢出策略的双层蜂窝网结构被研究,允许用户呼叫在上层宏小区和下层微小区间发生溢出,用户根据其移动速度进行接入层选择。为了评估这种分层网络的性能,提出了一种层间联合的微小区(宏小区)业务模型,此模型将常用的微小区(宏小区)业务模型(马尔可夫调制的泊松过程)延长,添加宏小区(微小区)的溢出业务模型(M/M/C/C的排队系统)。理论分析和仿真结果都验证了此模型的可靠性。最后利用此模型分析了速度阈值的作用。Hierarchical Cellular Structures （HCS） have become a major requirement in 3G mobile systems. A new general bidirectional call-overflow scheme for a two-tier HCS, which allows calls to overflow between the macrocells and microcells and layer selection in hierarchical architecture based on the velocity of the mobile making the calls, is considered. In order to evaluate the performance of such hierarchical systems, a layer-united microcell （macrocell） model wax developed, which was obtained by extending a general microcell （macrocell） model a Markov Modulated Poisson Process （MMPP） and adding an overflowing traffic model to the macrocell （microcell）, a M/M/C/C queueing system. Theoretical analysis and numerical evaluation show that the analytical model is more reliable. The effect of the velocity threshold was analyzed by using the models.

关 键 词：分层蜂窝结构 马尔可夫调制的泊松过程 溢出 速度阈值 

分 类 号：TN919[电子电信—通信与信息系统]