冲突减弱型LEO多址协议性能仿真分析  

Performance analysis and simulations of a collision weaken multiple access protocol of LEO satellite

作　　者：肖楠[1] 梁俊[1] 赵尚弘[1] 张基伟[1] 

机构地区：[1]空军工程大学电讯工程学院,陕西西安710077

出　　处：《电子技术应用》2012年第2期109-112,116,共5页Application of Electronic Technique

基　　金：空装综合计划部研究生科技创新基金(Dx2010305)

摘　　要：针对PRMA-HS协议中系统阻塞概率较大的问题,引入微时隙概念,提出了具有冲突减弱功能的MPRMA-HS协议,通过对可用时隙的再划分,增加系统竞争时隙数量,以降低系统拥塞。建立了协议模型,利用平衡点分析法对协议的接入阻塞概率、系统丢包率和吞吐率进行了理论推导。通过计算机仿真给出了协议的性能曲线,并与PRMA-HS进行了对比。结果表明,MPRMA-HS协议所能支持的最大用户终端数比PRMA-HS协议提高11.9%,而接入阻塞概率和丢包率均小于PRMA-HS协议。The concept of mini-slot was introduced in allusion to the high system blocking rate in PRMA-HS protocol, A modified protocol named MPRMA-HS which was able to lower down the collision rate was proposed by the repartition of non-reserved slots in a frame in order to increase the numbers of slots used for competition and decrease the system blocking. A protocol model was built for MPRMA-HS, from which the access blocking rate, packet dropping probability and system throughput were formulated by EPA ap- proach; the curves of system performance were given by simulations, which were also compared with PRMA-HS. The results indicate that MPRMA-HS could support more user terminals than PRMA-HS under the same situation by 11.9%, while the access blocking rate and packet dropping probability are much lower which have proved the advantages of MPRMA-HS protocol.

关 键 词：多址接入 协议 微时隙 分组预约 性能分析 

分 类 号：TN955[电子电信—信号与信息处理]