临近空间通信网RA/DAMA协议时延性能分析

Performance analysis of RA/DAMA protocol delay in near space communication network

近年来,临近空间通信网络开始成为新的研究热点,但对临近空间通信网多址接入协议的研究较少,且已发表的论文仅关注固定终端。为解决移动终端对临近空间物理链路资源有效共享的问题,提出一种随机预约/按需分配多址接入协议(RA/DAMA),运用排队理论对其平均时延公式进行了推导,并利用OPNET软件进行了仿真分析。仿真结果表明,随着网络负载的增加,网络的平均时延越来越大;相同的网络负载情况下,时帧周期越长,网络的平均时延越大,且时延性能越不稳定。

The near space communication network is becoming research focus for recent years.However,fewer researchers who are interested in multiple access protocol only focus on fixed terminals.As for the problem of mobile terminals sharing network channel resource effectively,random access/demand assignment multiple access（RA/DAMA） protocol is applied to near space communication network.A formula for the average time delay of the network is deduced according to the queue theory,and a simulation model is also established using OPNET software.Simulation results show that the average time delay of the network becomes longer as network load increases and in the case of same network load,when the length of time frame increases,it becomes longer and more instability.