서지주요정보
차등화 서비스를 위한 큐 스케줄링 기법 = A queue scheduling method for differentiated services (DiffServ)
서명 / 저자 차등화 서비스를 위한 큐 스케줄링 기법 = A queue scheduling method for differentiated services (DiffServ) / 이재영.
저자명 이재영 ; Lee, Jae-Young
발행사항 [대전 : 한국과학기술원, 2002].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8013050

소장위치/청구기호

학술문화관(문화관) 보존서고

MEE 02073

SMS전송

도서상태

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초록정보

Since the recent explosive expansion of internet users and applications has made quality of service(QoS) requirements for various applications such as voice and video over IP. The IETF proposes the differentiated services(DiffServ) for satisfying these QoS requirements. The DiffServ classifies incoming packets into three service classes which are expected forwarding(EF), assured forwarding(AF) and default(DE). It offers the proper QoS to each class according to per-hop behaviors(PHBs). And a scheduler is needed for scheduling these multiple classes. There are two traditional scheduling methods known as PQ(Priority Queue) and WRR(Weighted Round Robin). However, these two scheduling methods have some drawbacks. Because PQ services the higher priority class above all the lower classes, if the higher priority class is always full then the lower classes can not be serviced. In WRR, each class uses the link capacity by the assigned weight so that each class is fairly serviced. When the EF class traffic is heavy, however, WRR can not satisfy the QoS requirement of the EF class traffic. To overcome these drawbacks of PQ and WRR, propose a new scheduling method named the modified WRR mode 2(MWRRM2) based on two basic ideas. First, when there exist surplus link capacities, the capacities are used by EF above the other classes. Second, when the EF input traffic rate is increased then the EF class borrows some capacities from DE and returns the capacities to DE which are remained after use. For the simulation of the proposed scheduling method in this work, we use the Poisson process and the self-similar process for source traffic modeling. The simulation show that MWRRM2 maintains the required QoS of the AF class when the EF traffic rate is increased and improves QoS of the EF class, too, at the price of the performance of the DE class traffic.

서지기타정보

서지기타정보
청구기호 {MEE 02073
형태사항 xiii, 59 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Jae-Young Lee
지도교수의 한글표기 : 이황수
지도교수의 영문표기 : Hwang-Soo Lee
학위논문 학위논문(석사) - 한국과학기술원 : 전기및전자공학전공,
주제 차등화 서비스

스케줄링
DiffServ
Queue
Scheduling
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