自适应低轨卫星MAC协议性能分析  

Performance analysis of adaptive MAC protocol for LEO satellites

作　　者：管明祥[1] 王瑞春[1] 袁芳[1] 

机构地区：[1]深圳信息职业技术学院电子通信技术系,广东深圳518029

出　　处：《计算机工程与应用》2011年第7期96-98,共3页Computer Engineering and Applications

基　　金：学院第三批自然科学资助项目(No.LG-08010)

摘　　要：针对低轨卫星通信信道碰撞检测能力弱,时延较长和大业务量的特点,提出一种具有接入控制机制的自适应APRMAMAC协议。通过对信道负载和业务优先级判断来确定不同业务的接入概率函数,并且接入概率在每个时隙中通过更新来动态适应系统资源的变化。该MAC协议确保多个终端合理共享有限的无线资源同时,系统能达到高容量。通过仿真对语音业务丢包概率、数据包平均时延和数据业务吞吐量三个衡量协议性能指标与传统协议进行分析对比,证明了APRMA MAC协议显著改善系统性能。Considering that weak channel collision detection ability,long propagation delay and heavy load in LEO satellite communications,a valid adaptive APRMA MAC protocol is proposed.Different access probability functions for different services are obtained and appropriate access probabilities for voice and data users are updated slot by slot based on the estimation of the voice traffic and the channel status.In the proposed MAC protocol limited wireless resource is allocated reasonably by multiple users and high capacity is achieved.Three performance parameters：Voice packet loss probability,average delay of data packets and throughput of data packets are considered in simulation.Finally simulation results demonstrate that the performance of system is improved by the APRMA compared with the conventional PRMA,with an acceptable trade-off between QoS of voice and delay of data.

关 键 词：低轨卫星 自适应分组预约多址接入协议(APRMA) 媒体该问控制协议 协议 

分 类 号：TN925.93[电子电信—通信与信息系统]