Département Réseau, Sécurité et Multimédia Rapport d'Activités 2008
Département Réseau, Sécurité et Multimédia Rapport d'Activités 2008
Département Réseau, Sécurité et Multimédia Rapport d'Activités 2008
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schemes specifically suitable for links andtunnels where delays are high.Secondly, we presented two approaches tooptimize the use of ROHC profiles when ROHCcompression is used in NEMO n<strong>et</strong>works [2].The idea is to control the number of profilesthat both the HA and the MR have to maintainin order to manage all IP tunnels. In the firstapproach we only use the IP profile and thenhave one profile per mobile while in thesecond approach the number of profilesmaintained by the HA is considered as aresource that can be attributed or not to eachmobile (MR or MN) depending on their needs.The third part of the study focus on tunnelingcompression (TuCP) [1]. TuCP is used inconjunction with ROHC to reduce the tunneloverhead in NEMO n<strong>et</strong>works. The solution ofROHC and TuCP compression can be extendedto nested tunneling scenarios such as thosefound in nested mobile n<strong>et</strong>works (see figure 2and 3). We implemented a first version of theTuCP protocol.Figure 2. Nested Tunnels without TuCP CompressionFigure 3. Nested Tunnels with End-2-End TuCP CompressionFurther testing is ongoing for the evaluationand performance measurement of the TuCPprofiles.Figure 4. Header Compression Efficiency forROHC + TuCPWe find that header compression is moreefficient for IPv6 flows compared to IPv4flows. It is possible to achieve 66%compression efficiency for IPv6 flows (seefigure 4). The use of TuCP in conjunction withROHC in IP tunnels reduces the headeroverhead to 2 bytes. This makes tunnelingmechanisms virtually costless in terms ofbandwidth consumption.References[1] Priyanka Rawat, Jean-Marie Bonnin, AnaMinaburo, and Laurent Toutain, "An End-2-EndTunnel Header Compression Solution for NestedMobile N<strong>et</strong>works," International Conference on theLatest Advances in N<strong>et</strong>works, ICLAN'2007, Paris,Dec 2007.[2] Priyanka Rawat, Jean-Marie Bonnin, and AnaMinaburo, "Optimizing the use of Robust HeaderCompression profiles in NEMO N<strong>et</strong>works”, TheSeventh International Conference on N<strong>et</strong>working,ICN <strong>2008</strong>, Cancun, Mexico, April <strong>2008</strong>.[3] Priyanka Rawat, Jean-Marie Bonnin, LaurentToutain, and Yanghee Choi, "Robust HeaderCompression over Long Delay Links”, IEEE 67thVehicular Technology Conference, VTC<strong>2008</strong>-Spring,Singapore, May <strong>2008</strong>.4 Extract of Pracom’s Annual Report <strong>2008</strong>
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