摘要
随着卫星网络在应急通信中的应用,卫星终端业务的种类不断增加,业务流量可瞬间增大,具有明显的突发性,终端上的数据流量数据呈现出自相似性。利用时间间隔服从重尾分布的ON/OFF叠加模型产生卫星终端的自相似业务流量,并讨论了自相似业务流量输入对卫星终端的丢包率、时延和时延抖动的影响以及对有效带宽的需求。通过仿真,得出了网络终端业务丢包率、时延、时延抖动与系统缓存之间的关系,在此基础上,提出了减少时延、降低丢包率的思路,在带宽和缓存受限的情况下,为信息的高效传输提供了理论依据。
With the increase of application of satellite networks in emergency communication,and continuous growth of satellite terminal service types,the traffic may experience an instant augmentation showing a significant burst,and the data flow on the terminal also presents self-similarity.A method was proposed to generate satellite terminal self-similar traffic flow by using a superposition ON/OFF model with heavy-tailed distribution of time interval.And the effect of input of self-similar traffic flow on the packet loss rate,delay,and delay jitter was discussed,as well as the requirements on effective bandwidth.The relationship between packet loss rate at network terminal,delay,delay jitter and system cache was obtained by simulation,based on which,a method was put forward to reduce delay and decrease packet loss rate,providing theoretical support for efficient information transmission under condition of limited bandwidth and system cache.
出处
《计算机应用》
CSCD
北大核心
2014年第4期958-962,共5页
journal of Computer Applications
基金
国家863计划项目(2012AAXX)
辽宁省教育厅一般项目(L2013461)
关键词
应急通信
突发性
丢包率
时延
时延抖动
带宽需求
emergency communication
burstiness
packet loss rate
delay
delay jitter
bandwidth requirements
