Android is not doing anything related to the radio interface. It just knows some highlevel parameters about it like signalstrenght, networktype and provider. Most radio interface implementation details are abstracted b the Radio Interface Layer called RIL. Android just sees the RIL and on the otherside of the RIL there is another CPU with its own operating system that is handling the hole network part. And this part does the network type switching. Android doesn't know whats going on there it just knows we are connected to a 3G network, how good and how many other 2G cells are available android isn't aware of.
On Mon, Jan 16, 2012 at 8:04 PM, Koen Lavrijssen <lavrijssen.k...@gmail.com> wrote: > Correct me if I'm wrong (maybe you already did, kind of, but let me > try again), but there is a perfectly working 2G network which provides > me with great reception. Now a 3G network appears but the reception is > terrible. My phone connects to this 3G network, I get a call and take > it, but when it switches from 3G to 2G (because of the bad reception) > my call is dropped, even though the reception on the 2G network is top > notch. How is this not a problem with Android (as in shouldn't Android > make sure that when my 3G reception is bad/decreasing it switches over > to 2G before my call is dropped)? > > On 12 jan, 20:36, David Boettger <boettg...@gmail.com> wrote: >> These aren't really Android questions. They are related to the >> cellular network and to the baseband modem algorithms. >> >> Your phone has to be connected to a cellular network in order to >> receive voice calls and to send/receive SMS. If your phone >> disconnected from the cellular network under low signal conditions, >> you would miss calls and SMS, and would be frustrated every time you >> tried to place a call because the network re-attachment process would >> take a few seconds. >> >> Whether the phone uses 3G or 2G (or is moved from 3G to 2G during a >> call) is a function of cellular network parameters that the phone has >> no control over. It sounds like you simply don't have enough signal at >> home, or your service provider needs to optimize the network >> parameters in the cells that serve your home. Either way, this has to >> be addressed by your service provider. In the meantime, you could lock >> your phone in 2G mode and use 2G + Wi-Fi while at home. >> >> Dave >> >> On Jan 12, 4:06 am, Koen Lavrijssen <lavrijssen.k...@gmail.com> wrote: >> >> >> > The 3G coverage around my home is weak (no bar, 1 bar, 2 bars = highly >> > exceptional). >> >> > As far as I know there's no reason to connect to the 3G network when >> > the phone is on WiFi, but yet when WiFi is enabled and working my >> > phone will connect to the 3G network (not establishing a data >> > connection, but just connecting to the network). When I get a call and >> > move around a little the phone will drop from 3G to G (because of the >> > bad reception, I assume), but when that happens the call will be >> > dropped. >> >> > My suggestion: >> > - if WCDMA preferred = enabled, still ignore WCDMA during WiFi (if G >> > signal = stronger than 3G, which should be the case most of the time). >> > - somehow make sure that the G network is able to take over the call >> > over the 3G network without losing it. > > -- > unsubscribe: android-kernel+unsubscr...@googlegroups.com > website: http://groups.google.com/group/android-kernel -- unsubscribe: android-kernel+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-kernel
