• Title, Summary, Keyword: Object Transfer Latency

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Analytical Modelling and Heuristic Algorithm for Object Transfer Latency in the Internet of Things (사물인터넷에서 객체전송지연을 계산하기 위한 수리적 모델링 및 휴리스틱 알고리즘의 개발)

  • Lee, Yong-Jin
    • Journal of The Korea Internet of Things Society
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    • v.6 no.3
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    • pp.1-6
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    • 2020
  • This paper aims to integrate the previous models about mean object transfer latency in one framework and analyze the result through the computational experience. The analytical object transfer latency model assumes the multiple packet losses and the Internet of Things(IoT) environment including multi-hop wireless network, where fast re-transmission is not possible due to small window. The model also considers the initial congestion window size and the multiple packet loss in one congestion window. Performance evaluation shows that the lower and upper bounds of the mean object transfer latency are almost the same when both transfer object size and packet loss rate are small. However, as packet loss rate increases, the size of the initial congestion window and the round-trip time affect the upper and lower bounds of the mean object transfer latency.

Analytical model for mean web object transfer latency estimation in the narrowband IoT environment (협대역 사물 인터넷 환경에서 웹 객체의 평균 전송시간을 추정하기 위한 해석적 모델)

  • Lee, Yong-Jin
    • Journal of The Korea Internet of Things Society
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    • v.1 no.1
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    • pp.1-4
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    • 2015
  • This paper aims to present the mathematical model to find the mean web object transfer latency in the slow-start phase of TCP congestion control mechanism, which is one of the main control techniques of Internet. Mean latency is an important service quality measure of end-user in the network. The application area of the proposed latency model is the narrowband environment including multi-hop wireless network and Internet of Things(IoT), where packet loss occurs in the slow-start phase only due to small window. The model finds the latency considering initial window size and the packet loss rate. Our model shows that for a given packet loss rate, round trip time and initial window size mainly affect the mean web object transfer latency. The proposed model can be applied to estimate the mean response time that end user requires in the IoT service applications.

Mathematical Model for Mean Transfer Delay of Web Object in Initial Slow Start Phase (초기 슬로우 스타트 구간에서 웹 객체의 평균 전송 시간 추정을 위한 수학적 모델)

  • Lee, Yong-Jin
    • 대한공업교육학회지
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    • v.33 no.2
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    • pp.248-258
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    • 2008
  • Current Internet uses HTTP (Hyper Text Transfer Protocol) as an application layer protocol and TCP (Transmission Control Protocol) as a transport layer protocol to provide web service. SCTP (Stream Control Transmission Protocol) is a recently proposed transport protocol with very similar congestion control mechanisms as TCP, except the initial congestion window during the slow start phase. In this paper, we present a mathematical model of object transfer latency during the slow start phase for HTTP over SCTP and compare with the latency of HTTP over TCP. Validation of the model using experimental result shows that the mean object transfer latency for HTTP over SCTP during the slow start phase is less than that for HTTP over TCP by 11%.