计算机工程与应用 ›› 2011, Vol. 47 ›› Issue (7): 96-98.

• 网络、通信、安全 • 上一篇    下一篇

自适应低轨卫星MAC协议性能分析

管明祥,王瑞春,袁 芳   

  1. 深圳信息职业技术学院 电子通信技术系,广东 深圳 518029
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2011-03-01 发布日期:2011-03-01

Performance analysis of adaptive MAC protocol for LEO satellites

GUAN Mingxiang,WANG Ruichun,YUAN Fang   

  1. Department of Electronic Communication Tech.,Shenzhen Institute of Information Tech.,Shenzhen,Guangdong 518029,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2011-03-01 Published:2011-03-01

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APRMA MAC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。

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

Abstract: 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.

Key words: Low Earth Orbit(LEO) satellites, Adaptive Packet Reservation Multiple Access(APRMA), Media Access Protocol(MAC), protocol