摘要
为解决移动终端快速接入临近空间通信网的问题,设计了一种随机接入和按需分配方式相结合的MAC协议,并运用OPNET软件建立了基于移动终端的临近空间通信网仿真模型,分析了不同时帧长度对平均时延和吞吐量的影响。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,饱和吞吐量逐渐减小;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;在合适的时帧长度下,设计的仿真模型具有一定的工程实践性。
To solve the problem of mobile terminals accessing to near space communication network,a medium access control（MAC） protocol combined the random access and demand assignment multiple access（DAMA） is designed.And a simulation model of near space communication network based on mobile terminals is also established using OPNET software,in order to analyze the effect of ave-rage time delay and throughput with different lengths of time frame.Simulation results show that the average time delay of the network becomes longer and throughput becomes smaller 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.And in proper length of time frame,the simulation model is feasible in engineering.
出处
《计算机工程与设计》
CSCD
北大核心
2011年第9期2971-2975,共5页
Computer Engineering and Design
基金
陕西省自然科学基金项目(2007F03)
陕西省电子信息系统综合集成重点实验室基金项目(200902B)
关键词
临近空间通信网
移动终端
MAC协议
仿真
时延
吞吐量
near space communication network
mobile terminals
MAC protocol
simulation
time delay
throughput
