Packet time delay of polling-based multiplexing in advanced orbiting systems
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摘要: 目前的高级在轨系统(AOS,Advanced Orbiting Systems)多路复用研究主要以仿真为主,很少有文献给出专门的理论分析.针对基于轮询的AOS多路复用包时延进行研究,通过采用排队论中非空竭限量服务的休假排队系统建立模型,并采用循环再生法进行分析,得到了多路复用包时延计算公式,并给出包时延的下限值.仿真结果表明,在包到达率取值分别为1,2,3包/s,在各种不同的下行速率(范围240~330 bit/s)之下,包时延的仿真值曲线均高于理论下限值曲线,从而论证了理论推导的正确性.研究结果可以为工程设计提供一定的参考作用.Abstract: Most researches on multiplexing in advanced orbiting systems (AOS) were made by simulation, and few literatures got theoretical results. The packet time delay of polling-based multiplexing in AOS was studied. Mathematical model was established by using vacation queue system with non-exhaustive service, and it was analyzed through cycle regeneration method. A calculation formula of multiplexing packet time delay was derived, and the lower bound value was also obtained. Simulation results show that when the packet arrival rates are 1, 2, 3 packets per second and downlink rate ranges from 240 to 330 bit/s, simulation values of packet time delay are larger than the theoretical lower bound values, which proves the correctness of theoretical derivation. The results can provide reference for practical engineering design.
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Key words:
- polling /
- advanced orbiting systems /
- multiplexing /
- packet time delay /
- vacation queue system
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