I found that when my 9300 is downloading data over GPRS/EDGE, it is unable to receive incoming. No alert and call is diverted voice mail. However, it can receive call again when the GPRS session is idle.
Checked with my GSM operator and they believe it is phone problem. I know that they are using Ericsson platfrom on their network.
The firmware is V4.53.
Does Anyone get similar problem?
thanks,
Ellis :frown:
ellis777 wrote:I found that when my 9300 is downloading data over GPRS/EDGE, it is unable to receive incoming. No alert and call is diverted voice mail. However, it can receive call again when the GPRS session is idle.Checked with my GSM operator and they believe it is phone problem. I know that they are using Ericsson platfrom on their network.
The firmware is V4.53.
Does Anyone get similar problem?
thanks,
Ellis :frown:
This actually isn't a fault, so much as the nature of the beast concerning how the phones connect to the cell network.. The basic connection method is GSM, one GSM channel is needed to make/recieve a call, data rate it is a lowly 9600bps. GPRS is really only multiple GSMs bundled together. The network isn't designed to split your connection so that some of the bundled data can be used for a call, whilst the rest is used to continue a data transfer. Thats technically like making two calls simultaneously.
xoio
xoio wrote:This actually isn't a fault, so much as the nature of the beast concerning how the phones connect to the cell network.. The basic connection method is GSM, one GSM channel is needed to make/recieve a call, data rate it is a lowly 9600bps. GPRS is really only multiple GSMs bundled together. The network isn't designed to split your connection so that some of the bundled data can be used for a call, whilst the rest is used to continue a data transfer. Thats technically like making two calls simultaneously.
I was going to say something about that it must be a bug with the phone or the network or a compatibility problem between the two as I was sure that I could always receive calls with a GPRS session active. But, after testing just now downloading a 100KB web page and trying to ring my mobile, I notice it also goes straight to voicemail though the call arrives correctly when the session is active but not downloading.
Is this an inherent limitation of GPRS with all phones or something than can/should work in some circumstances?
Andy
It is an inherent limitation of, so called, "Class B" GSM/GPRS phones. All phones (and networks) on the market are, to my knowledge, "Class B": http://www.gsmworld.com/technology/gprs/class.shtml
N/A wrote:It is an inherent limitation of, so called, "Class B" GSM/GPRS phones. All phones (and networks) on the market are, to my knowledge, "Class B": http://www.gsmworld.com/technology/gprs/class.shtml
Ok, I am not alone, it happens to someone else.
"Class B mobile phones can be attached to both GPRS and GSM services, using one service at a time. Class B enables making or receiving a voice call, or sending/receiving an SMS during a GPRS connection. During voice calls or SMS, GPRS services are suspended and then resumed automatically after the call or SMS session has ended. "
The phones is supposed to suspend the GPRS session and let the call put through and resume the GPRS session when the call ended. I believe diverting it to a voice mail is a bug.
Can someone try than on a non Nokia 9300 phone?
Ok, tested on a Sony phone and other GSM operator. It is the same, call diverted to voice mail when downloading data. I have to say that it seems to be a design limitation rather than a bug. A bit disapointed. :frown:
It means that when the phone user makes a call (and outgoing call), the GPRS session is suspended for the duration of the call.
If there is a data transfer going on for an incoming call (someone calls you), the call is not completed (and diverts to voicemail, etc., apply, because they are handled on the network side). If it happens during any break in the data transfer, the call is let through, but not during it.
This is something customers don't want/expected. Is there any Class A GPRS phone in the market?
No Class A devices or Class A networks to my knowledge. I doubt that there ever will be.
N/A wrote:No Class A devices or Class A networks to my knowledge. I doubt that there ever will be.
It is time to think about 3G.
ellis777 wrote:It is time to think about 3G.
Sorry all, but this is rubbish. GPRS works as advertised on the 9500. E.g. I'm on the Web, GPRS active. Call comes in and I answer it. Five minutes later, I hang up and carry on surfing.
Must be something to do with your networks. I'm on Vodafone, if this helps.
Steve Litchfield
PS. GPRS is not GSM sessions strung together. It works in a totally different way. See the GPRS intro on my site.
Sorry, Steve, but it isn't rubbish, but how GSM/GPRS networks work.
Even in your phone, when there is a GPRS transfer going on, the incoming call will not come through. It may seem so, if there is a break in the transfer when the incoming call is attempted (in that case it may get through).
Note that when you download a web page, the actual page, linked stylesheets, embedded images, etc., are downloaded in separate HTTP requests. Between the requests there are windows where calls can be completed (as no data is being sent or received), but not when an actual data transfer is in progress.
Try this experiment: Create a web page with a link to a huge picture (which you know will take a long time to get download). Then on the phone go to this web page and hit the link. When the downloading begins, call the phone from another number. Try if a few times. What happens?
N/A wrote:Note that when you download a web page, the actual page, linked stylesheets, embedded images, etc., are downloaded in separate HTTP requests. Between the requests there are windows where calls can be completed (as no data is being sent or received), but not when an actual data transfer is in progress.
I bow to your superior knowledge here, although for most people, most of the time, I'd have thought there will always be enough of a gap that an incoming call can make it in?
I know I'm a fairly low bandwidth user as GPRS goes. Again, I'll have to bow to your real world tests!
Steve
theres something wierd here which i dont understand...
i had an Orange connection 1st... GPRS was active all the time & i could receive call eben when connected to my laptop
nowi have airtel & when i'm online surfing on my phone i can receive calls...but if i start to download something...i cant get calls till the download is complete.
but then again...airtel also offers blackberry products which are connected to gprs all the time & u can yet receive calls.... but u cant connect it to the laptop..... this is something i would want to try.