I have not actually used the openBTS system yet, but in other pico and nano cell systems that I have used, this depends heavily on a number of factors. Once a handset has registered with a network, it usually is quite happy to stay there until something prompts a change. In most cases, if you are using an operator's SIM, say AT&T, the handset will stay on the current network until its current connection quality drops, it moves, or it sees another AT&T signal or another signal in the SIM cards preferred provider list. Your BTS then either needs to be broadcasting the same NMC/MCC (i.e. spoofing...which has legal implications) or you need your own SIM card in the handset that is configured with the MCC/MNC of your BTS.
The other way to accomplish this is to set your OpenBTS to use the 001 test code for MNC. Most phones will attempt to camp on this code if its the best signal around and its not happy on its own network. This works best if you are in a zero-coverage area and you are sending out the 001 test code.
In the end, unless you use your own SIM cards and you have the phone configured to use your BTS, it won't just jump over to you if its happy where it is....and certainly for operator SIM cards, the phone will keep to its preferred provider list. You should also be aware that if the phone is SIM locked then you can't even put your own SIM card in the device as it will only work with the network that locked it (i.e. if you have an ATT phone and its been locked to only use the ATT network, then it won't work at all when you change the SIM card).
This is....at least my understanding....but this is complex subject. This also applies really to nano and pico cell type systems that have the full network behind it (ie. MSC, HLR, etc.). Since the OpenBTS is an RF front end to a VOIP core, I don't know enough about this type of thing to say if the above applies. Anybody tracking this thread, feel free to jump in :-)
I just have a small question on the manual operator selection. Is it possible to get the MS to camp on the openBTS cell automatically without having to choose the openBTS network manually from the MS?
I am not sure you can do that from settings or software. You can usually choose GSM or WCDMA on dual mode/quad band phones but this wont give you the ability to just disable a single band. If you know the network you are connecting to, you should be able to set the phone for manual operator selection and then pick the network you want...which will lock this to that network. If the phones are locked to TMobile or ATT, this won't work unless the BTS you connect to is setup to provide the correct network code.
On Apr 26, 2009, at 10:54 PM, Jane Chen wrote:
My phones can only get T-mobile or AT&T, so I would like to disable the 1900 band of my Nokia phones (3120 and 6131).
I read the Nokia 3120 user guide and searched through the Internet as well. I used "disable, nokia,3120, 1900, bands," as keywords, but I have not got any useful information to disable the 1900 band. Could you please give me any links or information how to disable the 1900 band of Nokia 3120 if it is convenient for you?
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