基于随机/自由和按需算法的卫星BoD多级MAC协议  

Multi-layered media access protocol based on aloha,random and DAMA for BoD satellite networks

作　　者：李于衡[1] 孙恩昌[1] 易克初[1] 

机构地区：[1]西安电子科技大学综合业务网国家重点实验室,陕西西安710071

出　　处：《系统工程与电子技术》2007年第1期17-20,共4页Systems Engineering and Electronics

基　　金：国家自然科学基金资助课题(60172029)

摘　　要：针对全球没有统一BoD协议标准的问题,根据随机、自由和按需分配多址协议的特点,借鉴802.11分层协议工作原理,提出了一种新的BoD多级MAC协议,它根据地面站数量和系统业务量确定使用不同的协议,通过提高动态信道利用率达到降低平均传输时延的目的。理论分析和仿真结果表明,多级MAC协议在系统业务量小、地面站多时能得到小的传输时延;业务量增大后,在保持最大系统流量的同时仍能得到较小的传输时延,同时通过改进碰撞算法保证了系统的稳定性。Bandwidth-on-demand （BoD） protocol is a key multimedia access （MAC） protocol for the next generation satellite communication. Although a lot of companies claim owning BoD protocol with high perform ance, There are no any universal standards and implement ways at present. Short transmission delay and high throughput are always the final goal to pursue. Enlightened by the principle of MAC 802.11 protocol being classified, taking the advantage of AI.OHA and CFDAMA respectively, a new multiple MAC PoD protocol is presented, By using unassigned slots more efficient, the new BoD protocol reduces the average delay further than the PoD protocol only based on CFDAMA. The results of the analysis and simulation show the proposed protocol has short transmission delay and high throughput and a proper protoeol will be selected with varying amounts of earth stations and traffic load over satellite ehannels. Meanwhile a retransmitting strategy proposed here ensures the stabilization of the protocol.

关 键 词：卫星通信 信息处理 多址接入协议 频带按需分配 

分 类 号：TN927[电子电信—通信与信息系统]