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Träfflista för sökning "WFRF:(Hjalmarsson Håkan) ;pers:(Tang Ao)"

Sökning: WFRF:(Hjalmarsson Håkan) > Tang Ao

  • Resultat 1-4 av 4
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1.
  • Jacobsson, Krister, et al. (författare)
  • ACK-clocking dynamics: Modelling the interaction between windows and the network
  • 2008
  • Ingår i: 27TH IEEE CONFERENCE ON COMPUTER COMMUNICATIONS (INFOCOM). - 9781424420254 ; , s. 181-185
  • Konferensbidrag (refereegranskat)abstract
    • A novel continuous time fluid flow model of the dynamics of the interaction between ACK-clocking and the link buffer is presented.. A fundamental integral equation relating the instantaneous flow rate and the window dynamics is derived. Properties of the model, such as well-posedness and stability, are investigated. Packet level experiments verily that this new model is more accurate than existing models, correctly predicting qualitatively different behaviors, for example when round trill delays are heterogeneous.
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2.
  • Jacobsson, Krister, et al. (författare)
  • An Improved Link Model for Window Flow Control and Its Application to FAST TCP
  • 2009
  • Ingår i: IEEE Transactions on Automatic Control. - : Institute of Electrical and Electronics Engineers (IEEE). - 0018-9286 .- 1558-2523. ; 54:3, s. 551-564
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper presents a link model which captures the queue dynamics In response to a change in a transmission control protocol (TCP) source's congestion window. By considering both self-clocking and the link integrator effect, the model generalizes existing models and is shown to be more accurate by both open loop and closed loop packet level simulations. It reduces to the known static link model when flows' round trip delays are identical, and approximates the standard integrator link model when there is significant cross traffic. We apply this model to the stability analysis of fast active queue management scalable TCP (FAST TCP) Including its filter dynamics. Under this model, the FAST control law is linearly stable for a single bottleneck link with an arbitrary distribution of round trip delays. This result resolves the notable discrepancy between empirical observations and previous theoretical predictions. The analysis highlights the critical role of self-clocking in TCP stability, and the proof technique is new and less conservative than existing ones.
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3.
  • Tang, Ao, et al. (författare)
  • Queue Dynamics With Window Flow Control
  • 2010
  • Ingår i: IEEE/ACM Transactions on Networking. - 1063-6692 .- 1558-2566. ; 18:5, s. 1422-1435
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper develops a new model that describes the queueing process of a communication network when data sources use window flow control. The model takes into account the burstiness in sub-round-trip time (RTT) timescales and the instantaneous rate differences of a flow at different links. It is generic and independent of actual source flow control algorithms. Basic properties of the model and its relation to existing work are discussed. In particular, for a general network with multiple links, it is demonstrated that spatial interaction of oscillations allows queue instability to occur even when all flows have the same RTTs and maintain constant windows. The model is used to study the dynamics of delay-based congestion control algorithms. It is found that the ratios of RTTs are critical to the stability of such systems, and previously unknown modes of instability are identified. Packet-level simulations and testbed measurements are provided to verify the model and its predictions.
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4.
  • Tang, Ao, et al. (författare)
  • Window flow control : Macroscopic properties from microscopic factors
  • 2008
  • Ingår i: 27TH IEEE CONFERENCE ON COMPUTER COMMUNICATIONS (INFOCOM). - 9781424420254 ; , s. 538-546
  • Konferensbidrag (refereegranskat)abstract
    • This paper studies window flow control focusing on bridging the gap between microscopic factors such as burstiness in sub-RTT timescales, and observable macroscopic properties such as steady state bandwidth sharing and flow level stability. Using new models, we analytically capture notable effects of microscopic behavior on macroscopic quantities. For loss-based protocols, we calculate the loss synchronization rate for different flows and use it to quantitatively explain the unfair bandwidth sharing between paced and unpaced TCP flows. For delay-based protocols, we show that the ratios of round trip delays are critical to the stability of the system. These results deepen the fundamental understanding of congestion control systems. Packet level simulations are used to verify our theoretical claims.
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  • Resultat 1-4 av 4

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