2009/9/2 Denis Kenzior <denk...@gmail.com>: >> AFAIK, attach status of GPRS has both regulatory aspects to consider >> (some operators require always attached vs. some prohibit it) as well >> as power consumption issues (auto-attach might draw more power than >> on-demand, although there's an inverse effect on latency). These are >> issues you need to take into account, and higher layers in the stack >> definitely *need* to be aware of as well. Also, I don' t think oFono >> is the correct place for these decisions -> better expose a necessary >> API and let upper layers deal with it. > > I know you guys are coming from mobile phone perspective, but that one isn't > the only scenario. We have netbooks/laptops with gprs data cards to consider > as well. Hardcoding operator requirements is also not an option, since SIM > cards can be changed. > > I fundamentally disagree that the logic should be in the higher layers. oFono > has all the information to handle this, and can be hinted on what is > appropriate behavior easily enough. oFono should simply store the auto-attach > preferences in its IMSI-indexed preference store. The operator can bootstrap > these preferences if required.
Operator requirements were only half of the story. You need to be able to disable auto-attach in low power conditions, and this logic definitely doesn't belong in oFono. This applies equally well to mobile phones as it does to laptops/netbooks. >> In general, I appreciate the attempt to hide ugly details from >> applications, but unfortunately some things can't well be hidden. >> Another unrelated, but similar issue is network scanning. It just >> isn't going to work without us exposing it in the D-Bus API >> explicitly. >> > > Modem drivers will have some control over whether the scan is performed > automatically, but denying the capability for everyone is not the right thing > to do either. Agree, and I don't think that was what I was suggesting either. >> The reason is simple, Nokia modems suspend GPRS when scanning (or >> registering), simply because the operation will take roughly three >> times as long with GPRS attached. You will find this feature in >> current phones, too. > > Then ideally you should have two scan modes, periodic and user initiated. For > periodic mode we don't care how long it takes. +1 Cheers, Aki _______________________________________________ ofono mailing list ofono@ofono.org http://lists.ofono.org/listinfo/ofono
