一种蜂窝移动用户小区切换的宏分集方案  

Macro diversity scheme for cellular mobile user handoff

作　　者：李中捷[1] 陈燚雷 曹世明 朱翠涛[1] LI Zhongjie;CHEN Yilei;CAO Shiming;ZHU Cuitao(Hubei Key Lab. of Intelligent Wireless Communications, South-Central Univ. for Nationalities, Wuhan 430074, China)

机构地区：[1]中南民族大学智能无线通信湖北省重点实验室,湖北武汉430074

出　　处：《西安电子科技大学学报》2019年第2期114-118,共5页Journal of Xidian University

基　　金：国家自然科学基金(61379028;61671483);湖北省自然科学基金(2016CFA089);中央高校基本科研业务费专项资金(CZY19003)

摘　　要：针对毫米波蜂窝网络中用户移动产生切换造成的通信链路不稳定问题,提出一种双基站宏分集方案,并基于该方案分析了移动用户的切换概率。首先,假设基站分布为泊松点过程,目标用户采用最近基站接入准则,建立双基站宏分集下蜂窝用户的移动模型;然后,由随机几何理论推导出移动用户的切换概率理论表达式;最后,通过MATLAB仿真软件求解切换概率的分析解,并使用蒙特卡罗仿真验证分析结果的可靠性。仿真结果表明,随着用户移动速度和基站密度增加,发生一次切换的概率明显增大,但是发生两次切换的概率几乎不变。因此,该方案可以较好地保证移动用户通信链路的稳定。Aiming at the instability of the communication link caused by mobile handoff in millimeter wave cellular networks,a dual base station macro diversity scheme is proposed,and the handoff probability of the mobile user is analyzed based on the scheme.First,the mobile model of cellular users under the dual base station macro diversity scheme is established based on the hypothesis that the distribution of base stations is the Poisson point process and that the typical user adopts the nearest base station access criteria.Second,the theoretical expression for handoff probability for mobile users is derived by stochastic geometry theory.Finally,the theoretical solution of handoff probability is solved by the MATLAB simulation software,and the reliability of the analytical results is verified by the Monte Carlo simulation.Simulation results show that with the increase of the mobile speed and base station density,the probability of one handoff increases obviously,but the probability of two handoffs is almost unchanged.Therefore,the proposed scheme can better guarantee the stability of the mobile user’s communication link.

关 键 词：毫米波 蜂窝网络 宏分集 随机几何 切换概率 

分 类 号：TN929.5[电子电信—通信与信息系统]