臺灣博碩士論文加值系統

在本論文中 , 我們的研究重點在於衛星上的排程機制 . 由於未來的衛星
非同步傳輸網路中支援多重服務 , 所以一設計良好的服務機制是必需的
. 而且衛星資源是很可貴的 , 所以我們利用動態交換轉頻器並配合適宜
之排程機制來支援多重服務 . 在第二章中 , 我們提出一速率基底式隨機
輪詢策略 , 由於此機制是簡易的 , 所以我們可迅速的算出常速率交通源
, 變速率交通源 , 剩餘速率交通源的服務品質 . 在第三章中 , 針對變
速率交通源的特性 , 我們提出一適應性速率基底式隨機輪詢策略 , 使得
其服務品質獲得提升 . 在第四章中 , 我們提出一確保服務品質之排程機
制 , 使得各類服務所要求的不同種服務品質要求都能獲得滿足 .

In this thesis , we focus on the scheduling problem onboard the
satellite .For future Satellite ATM network which supports
multiple classes of service ,a well-designed scheduling
mechanism is absolutely needed . Also keep in mindthat satellite
resource is precious , we come up with a scheme using
dynamicswitching transponder as well as QoS-based scheduling
mechanism . In chapter 2,a rate-based randomly polling scheme is
proposed . The operation of this scheme is simple , so we can
easily calculate the Quality-of-Service given to each class of
service , say , CBR,VBR,and ABR . In chapter 3 , an adaptive
rate-based randomly polling scheme is introduced for dealing
with VBR traffic .The approach we adopted is through onboard
monitoring and estimation . So resource allocated to each VBR
queue is adaptive to its(near) instantaneous arrival rate . Via
simulation , QoS is upgraded and satellite resource is
moreefficiently used . In chapter 4 , a guaranteed QoS
scheduling mechanism is proposed . To meet the versatile QoS
needs and save the unnecessary transitionsof the transponders ,
we set some logic indicators to control the location of the
transponders . So , delay jitter of CBR , delay of VBR are all
guaranteed ,and satellite resource is well utilized .