[manet] Internet draft on CEQMM: a Complete and and Efficient Quality of Service Model for MANETs
Hakim.Badis@lri.fr Fri, 21 April 2006 13:12 UTC
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Date: Fri, 21 Apr 2006 14:49:31 +0200
From: Hakim.Badis@lri.fr
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Cc: qolsr@lri.fr, T.Clausen@computer.org
Subject: [manet] Internet draft on CEQMM: a Complete and and Efficient Quality of Service Model for MANETs
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Hi all, I have requested publication of an individual draft that specifies CEQMM, a Complete and Efficient Quality of Service (QoS) Model for MANETs. CEQMM operates on a best-effort MACs and can include heterogeneous nodes with different radio capabilities. In this first CEQMM draft, only two classes are used: QoS traffic class and best-effort traffic class. QoS traffic class is given per-flow provisioning. The next CEQMM draft update will give a predefined set of service classes and use both per-flow state property of IntServ and the service differentiation of DiffServ. Until the draft becomes available on the usual IETF draft directories, it has been made accessible at the following URL: http://www.lix.polytechnique.fr/~badis/internet-drafts/draft-badis-manet-ceqmm-00.txt The model implementation will be soon available on the QOLSR website: http://qolsr.lri.fr/ Any comments or suggestions on the subject are welcome. Regards, --Hakim. --------- Abstract --------- This draft specifies CEQMM, a Complete and Efficient Quality of Service (QoS) Model for MANETs which combines the positive aspects of both IntServ and DiffServ. It uses a hybrid per-flow and per-class provisioning scheme. In such a scheme, traffic of highest priority is given per-flow provisioning while other priority classes are given per-class provisioning. To offer this scheme and to ensure that certain packets receive higher priority transmission than other packets, priority classifier, active queue management and packet scheduler are integrated. CEQMM applies the QOLSR protocol to support multiple-metric routing criteria and to respond quickly when changes in topology and/or QoS conditions are detected. Once a path is chosen for one QoS flow, CEQMM performs call admission control (CAC) at each intermediate node. For only QoS flows of highest priority, a node can precede to soft and later hard bandwidth reservation on links during the CAC process. CEQMM implements congestion avoidance mechanisms to prevent a network from entering the congested state. However, in MANETs, network congestion can still occur frequently under mobility. In order to prevent performance degradation due to mobility-triggered congestion, CEQMM uses congestion control scheme based on: (i) rated control of best-effort traffic in the originator node, (ii) path selection for best-effort traffic, (iii) active queue management and (iv) backoff timer method. In this first CEQMM draft, only two classes are used: QoS traffic class and best-effort traffic class. QoS traffic class is given per-flow provisioning. The next CEQMM draft update will give a predefined set of service classes and use both per-flow state property of IntServ and the service differentiation of DiffServ. In order to maintain the most recent information about the network topology and QoS conditions, control traffic is enqueued in a separate queue and assigned the highest priority than the data traffic. _______________________________________________ manet mailing list manet@ietf.org https://www1.ietf.org/mailman/listinfo/manet