RE: 3gpp-analysis-07: (semi-)editorial issues

[<Jonne.Soininen@nokia.com>]

Pekka, Juha,

> -----Original Message-----
> >  JW: In my opinion, this sentence can be problematic: "it may also
> > make sense to open both PDP contexts in advance, before they are
> > used, because the activation of a context may take a relatively long
> > time."  It can lead to a situation in which we have activated
> > hundreds of thousands extra, unused PDP contexts in the network and
> > this is not good from network resource usage point of view. PDP
> > context usage is quite much defined by used applications and I think
> > we shouldn't write "open both types of PDP contexts in advance"
> > recommendation. My recommendation is to leave the PDP context
> > activation policy decided by the implementers / application
> > developers.
> 
> I think the wording above, "may also make sense", seems informative 
> enough, not forcing the operators/vendors behave like suggested if 
> they have good reasons.
> 
> But that aside, I think it may make sense to discuss one assumption 
> different people seem to be making in a different fashion.
> 
> When you say "used applications", what are you referring to?  The 
> whole IMS subsystem, some IP applications installed on a node (SSH 
> client, web browser, ftp client, peer-to-peer application, etc.)?

Now assuming what Juha was thinking: I think Juha means all of those.

> 
> These bring on two points which have been raised in the past: PDP
> context activation takes time (maybe like 5 seconds or so, at 
> least?), 
> so activating it when trying to contact a peer could lead to long 
> waiting and unsatisfied users.  Similarly, with some applications, it 
> is not known in advance which kind of peer nodes it will connect to 
> (e.g., the client apps above).  IMS subsystem is an exception here: 
> you always know it's v6-only.  Maybe you have that in mind?

Yes, you are right. The PDP Context activation does take some time. It would be of course better if the PDP Context would be open all the time - at least according my opinion. However, there is a sentiment among some operators that having multiple PDP Contexts open just-in-case is not the best use of the network resources. Though, an idle PDP Context does not use much network resources. 
So, generally I agree with you, but I think in the sake of having the best possible support for this document I think Juha's proposed text is better fitted.

> 
> So, if the UEs include (or could include) apps like SSH/telnet
> clients, web browsers, etc. (especially if those are not proxied by
> the 3GPP operator), it might make sense to open PDP contexts in 
> advance (or at the latest when the application is started).

For the reason I explained above I would say that the wording that Juha put would be the strongest possible we can write at the moment.

> 
> Some of this justification should probably go in the document in some 
> form.

Yes, maybe a few more words around the text Juha proposed would be helpful.

Cheers,

Jonne.