卫星ATM中的复用自适应随机预约多址协议研究

Multiplexed Random Reservation Adaptive Assignment Protocol for ATM over Satellite

在多业务卫星网络中,为了设计一种既能最大限度利用信道资源,又能保证各类业务服务质量QoS的多址协议是十分重要的。通过对T.OS(Tiros Operational Satellite)提出的随机自适应多址协议的研究,提出了一种复用自适应随机预约多址协议,其特点是考虑了小孔径终端(VSAT)网络环境下,同一终端存在多路业务的情况。在具体阐述该协议内容的基础上,分析和仿真了该协议的性能。研究结果表明:当信源突发性很强时,该协议可显著减少终端申请的时隙数,从而提高了多址机制的吞吐量而又不影响各种业务的QoS。

In satellite network with multiple services, it is very significant to design a multiple access protocol, which not only can utilize the channel resource maximumly but also guarantee the QoS （ Quality of Service） of all kinds of services. Through the research on the random adaptive assignment protocol proposed by T. OS （Tiros Operational Satellite）, this paper presents a multiplexed random reservation adaptive assignment protocol, which considers the case that there are multiple services at the same terminal under VSAT（very small aperature terminal） network environment. On the basis of the specific protocol contents, its performances are analyzed and simulated. The research results indicate that the protocol can notably reduce the number of the applied temporal piece for the high burst rate, improve the throughput of the multiple access system and avoid impacting the QoS.