Implementation and performance analysis of a QoS-aware TFRC mechanism

Jourjon, Guillaume; Lochin, Emmanuel; Dairaine, Laurent; Sénac, Patrick; Moors, Tim; Seneviratne, Aruna

doi:10.1109/icon.2006.302658

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…As an example of result, the following figure illustrates the quasi-perfect correspondence between TFRC in simulated and executed mode. The complete results of this conformance testing are available in [33] and these results show a very conformant behaviour of both TFRC and gTFRC compared to their reference. …”

Section: Implementation and Integration Of Gtfrc In A Multi-domain Qomentioning

confidence: 73%

gTFRC, a TCP friendly QoS-aware rate control for DiffServ Assured Service

Lochin

Dairaine²,

Jourjon

2006

Telecommun Syst

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This study addresses the end-to-end congestion control support over the DiffServ Assured Forwarding (AF) class. The resulting Assured Service (AS) provides a minimum level of throughput guarantee. In this context, this article describes a new end-to-end mechanism for continuous transfer based on TCP-Friendly Rate Control (TFRC). The proposed approach modifies TFRC to take into account the QoS negotiated. This mechanism, named gTFRC, is able to reach the minimum throughput guarantee whatever the flow's RTT and target rate. Simulation measurements and implementation over a real QoS testbed demonstrate the efficiency of this mechanism either in over-provisioned or exactly-provisioned network. In addition, we show that the gTFRC mechanism can be used in the same DiffServ/AF class with TCP or TFRC flows.

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Section: Implementation and Integration Of Gtfrc In A Multi-domain Qomentioning

confidence: 73%

gTFRC, a TCP friendly QoS-aware rate control for DiffServ Assured Service

Lochin

Dairaine²,

Jourjon

2006

Telecommun Syst

Self Cite

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“…Nowadays, new approaches have proposed to design specific DiffServ transport protocols (such as [9], [18]) able to be aware of the negotiated QoS thanks to a QoS congestion control and cross-layer mechanisms allowing the transport protocol to be fully aware of the target rate negotiated between the application an the network provider. Following these proposals which have demonstrated their complete compliances with DiffServ QoS network architecture such as the EUQoS 3 architecture [23], the question to use TCP as QoS transport protocol in order to provide services guarantees seems outdated.…”

Section: Discussionmentioning

confidence: 99%

TCP throughput guarantee in the DiffServ Assured Forwarding service: what about the results?

Lochin

Anelli

2008

Ann. Telecommun.

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International audienceSince the proposition of quality of service (QoS) architectures by the Internet Engineering Task Force (IETF), the interaction between TCP and the QoS services has been intensively studied. This paper proposes to look forward to the results obtained in terms of TCP throughput guarantee in the DiffServ assured forwarding (DiffServ/AF) service and to present an overview of the different proposals to solve the problem. It has been demonstrated that the standardized IETF DiffServ conditioners such as the token bucket color marker and the time sliding window color maker were not good TCP traffic descriptors. Starting with this point, several propositions have been made, and most of them present new marking schemes in order to replace or improve the traditional token bucket color marker. The main problem is that TCP congestion control is not designed to work with the AF service. Indeed, both mechanisms are antagonists. TCP has the property to share in a fair manner the bottleneck bandwidth between flows while DiffServ network provides a level of service that is controllable and predictable. In this paper, we build a classification of all the propositions made during the past few years and compare them. As a result, we will see that these conditioning schemes can be separated into three sets of action levels and that the conditioning at the network edge level is the most accepted one. We conclude that the problem is still unsolved and that TCP, conditioned or not conditioned, remains inappropriate for the DiffServ/AF service

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“…Knowing the reserved resources for a flow is beneficial for the congestion control entity, which could base the increase and decrease decisions on the reserved rate. One example is [21], where the authors modify TFRC such that the sending rate is never reduced below the reserved rate, which obviously improves performance of the protocol.…”

Section: Diffservmentioning

confidence: 98%

Congestion Control for Scalable VBR Video with Packet Pair Assistance

Libæk

Kure

2008

2008 Proceedings of 17th International Conference on Computer Communications and Networks

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The SVC (Scalable Video Coding) extension to the recent video compression standard H.264/MPEG-4 AVC paves the way for video congestion control, by allowing flexible on-thefly adjustments of the sending rate. We study the interaction between TFRC (TCP-Friendly Rate Control) and application level rate control, and observe that TFRC requires relatively large router buffers to keep packet loss on acceptable levels. In turn, this leads to increased jitter which excludes delay sensitive applications. As a response, the Packet Pair Assisted Congestion Control is presented and compared with TFRC.The two transport protocols are simulated in a DiffServ environment, and we find that proper congestion control may replace complex admission control mechanisms without sacrificing utilization or QoS guarantees. In fact, the results indicate that semi-elastic video can be sent in an AF (Assured Forwarding) class with small buffers, leaving the EF (Expedited Forwarding) class to traffic with more extreme delay requirements.

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Implementation and performance analysis of a QoS-aware TFRC mechanism

Cited by 5 publications

References 9 publications

gTFRC, a TCP friendly QoS-aware rate control for DiffServ Assured Service

gTFRC, a TCP friendly QoS-aware rate control for DiffServ Assured Service

TCP throughput guarantee in the DiffServ Assured Forwarding service: what about the results?

Congestion Control for Scalable VBR Video with Packet Pair Assistance

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