Hi Raj, thanks for your review. Comments inline.
-----Messaggio originale----- Da: [email protected] [mailto:[email protected]] Inviato: giovedì 8 marzo 2012 17:14 A: Demaria Elena; [email protected] Oggetto: Re: [DMM] R: New IETF draft submitted Hi Elena, Thanks for the I-D which is an attempt to provide the basis for computing the cost benefits of a hierarchical Vs distributed mobility architecture. A few questions: 1. I am not sure I understand Fig 3 which is portraying the distributed model. You have multiple PGWs in this architecture as opposed to Fig 2. How does that make the architecture distributed? [ED] There are different possible level of distribution. In this first (simplified) model we considered an operator with only one point of exchange with the big Internet. The question is: would it be convenient for the operator to distribute the GWs in all PoPs or just to maintain a single GW in the PoP hosting the internet point of exchange? The answer is: it depends on the amount of local and Internet traffic. We based this initial model looking at current mobility architectures. One of the scopes for further work is to extend the study to see what happens if the GW is co-located with the eNB, so considering a more strict DMM approach to mobility. 2. The major cost obviously lies in backhauling traffic from the eNB/BS' to the PGW. Does your model account for this? Additionally the cost varies depending on whether the SGW and PGW are in different countries, between operator boundaries etc. Not sure if you consider these variables as well. [ED] The costs considered were only from one PoP to another since what varies is the position of GWs and the backhauling from the eNBs doesn't change. We didn't consider roaming case yet. 3. In the figures, does the backbone refer to the network consisting of the SGW, MME, eNB/BS'? [ED] No, the backbone refers to the inter-PoP network. Moreover, for the time being, we only considered user plane traffic, not signaling. 4. Have you mapped the equations with real-world traffic costs in the TI network to see how close they are? [ED] Even if the cost model and the equations are still preliminary and very simplified the answer is yes. Elena I do think that a formal way to derive the cost benefits of centralized vs distributed mobility architectures is very useful and this is a good start. -Raj On 3/7/12 3:59 AM, "ext Demaria Elena" <[email protected]> wrote: >Hi all, >this is to inform you that we have submitted a new draft related to DMM >topic. >http://www.ietf.org/internet-drafts/draft-demaria-dmm-dimensioning-cons >ide >rations-00.txt > One of the main questions posed during recent discussions on > distributed mobility architectures is if the distributed architecture > can have advantages in terms of costs with respect to a centralized > one. > > This draft describes a general method to calculate the costs of the > centralized and distributed scenarios. Even if a simplified model > has been used, some information can be earned. Each operator can use > this model and his own costs to discover the optimal architecture > based on traffic observed in the network. > >Comments welcome. > >Elena > > > >-----Messaggio originale----- >Da: [email protected] >[mailto:[email protected]] >Per conto di [email protected] >Inviato: venerdì 2 marzo 2012 11:38 >A: [email protected] >Oggetto: I-D Action: >draft-demaria-dmm-dimensioning-considerations-00.txt > > >A New Internet-Draft is available from the on-line Internet-Drafts >directories. > > Title : Dimensioning considerations for distributed >mobility architecture > Author(s) : Elena Demaria > Loris Marchetti > Filename : >draft-demaria-dmm-dimensioning-considerations-00.txt > Pages : 10 > Date : 2012-03-02 > > One of the main questions posed during recent discussions on > distributed mobility architectures is if the distributed architecture > can have advantages in terms of costs with respect to a centralized > one. > > This draft describes a general method to calculate the costs of the > centralized and distributed scenarios. Even if a simplified model > has been used, some information can be earned. Each operator can use > this model and his own costs to discover the optimal architecture > based on traffic observed in the network. > > >A URL for this Internet-Draft is: >http://www.ietf.org/internet-drafts/draft-demaria-dmm-dimensioning-cons >ide >rations-00.txt > >Internet-Drafts are also available by anonymous FTP at: >ftp://ftp.ietf.org/internet-drafts/ > >This Internet-Draft can be retrieved at: >ftp://ftp.ietf.org/internet-drafts/draft-demaria-dmm-dimensioning-consi >der >ations-00.txt > >_______________________________________________ >I-D-Announce mailing list >[email protected] >https://www.ietf.org/mailman/listinfo/i-d-announce >Internet-Draft directories: http://www.ietf.org/shadow.html or >ftp://ftp.ietf.org/ietf/1shadow-sites.txt > >Questo messaggio e i suoi allegati sono indirizzati esclusivamente alle >persone indicate. La diffusione, copia o qualsiasi altra azione >derivante dalla conoscenza di queste informazioni sono rigorosamente vietate. >Qualora abbiate ricevuto questo documento per errore siete cortesemente >pregati di darne immediata comunicazione al mittente e di provvedere >alla sua distruzione, Grazie. > >This e-mail and any attachments is confidential and may contain >privileged information intended for the addressee(s) only. >Dissemination, copying, printing or use by anybody else is >unauthorised. If you are not the intended recipient, please delete this >message and any attachments and advise the sender by return e-mail, Thanks. > >_______________________________________________ >dmm mailing list >[email protected] >https://www.ietf.org/mailman/listinfo/dmm Questo messaggio e i suoi allegati sono indirizzati esclusivamente alle persone indicate. La diffusione, copia o qualsiasi altra azione derivante dalla conoscenza di queste informazioni sono rigorosamente vietate. 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