适用于平台摆动模型的HAPS通信系统信道分配算法  

A Channel Assigning Algorithm for Platform Displacement Model in HAPS Communication System

作　　者：蒋静雅[1] 张邦宁[1] 郭道省[1] 叶展 

机构地区：[1]解放军理工大学通信工程学院,南京210007

出　　处：《电讯技术》2015年第8期906-912,共7页Telecommunication Engineering

摘　　要：针对高空平台(HAPS)遭受平流层横风影响呈现水平摆动现象,引起地面呼叫用户为继续获得可靠服务在蜂窝间来回切换的问题,提出了平台摆动条件下区分用户优先级的信道预留和切换排队相结合的信道分配算法。该算法充分考虑了不同类型用户终端对服务等级的需求,对用户终端进行了优先级区分,且从降低切换失败率的角度,在信道预留基础上对切换呼叫用户进行排队。仿真结果表明,与传统的无优先级切换排队和区分优先级的固定信道预留算法相比,该算法能够显著降低切换掉话率,尤其是高优先级用户的切换掉话率,补偿了因平台运动所导致的系统性能损失。A high altitude platform station（HAPS） will move back and forth horizontally because of the cr- osswind in the stratosphere, causing a problem that ground call users should handover between cells to get continually dependable service. To solve the problem, a channel assigning algorithm combining channel res- ervation and handover queuing with priorities based on platform＇ s horizontal movement is proposed. This algorithm takes full account of the needs of different types of user terminals on the service grade, prioritizes the user terminals, and introduces handover queuing based on channel reservation from the point of reduc- ing the handover dropping rate. Simulation results show that, compared with no users priority handover queuing and only channel reservation with priorities, this algorithm can significantly reduce the handover dropping probability, especially the users with high priorities, to compensate system performance loss caused by the lolatform motion.

关 键 词：高空平台通信系统 信道分配 信道预留 切换排队 切换掉话 

分 类 号：TN927[电子电信—通信与信息系统]