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Posted by Greenhorn on May 22, 2005, 1:10 pm
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Hi,
I would like to know how the roaming operator selection works in
cellular based networks, does my (hoome) operator provide me with a
list of roaming operators. First of all, how the network recognition
works, is it based on a string that is broadcasted by the basestations
i.e., how does my mobile recognize that there is a base station of my
operator.
When away from my operators coverage area, how does it recognize which
networks have roaming agreements with my home operator. Is it something
thats done more by the base station than by my mobile phone (e.g., it
could be that my cell broadcasts saying 'i belong to this operator,
anyone there')
Can someone point me to the formal document(s) that specify this
Regards,
greenhorn.
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Posted by Joseph on May 22, 2005, 6:05 pm
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wrote:
> I would like to know how the roaming operator selection works in
>cellular based networks, does my (hoome) operator provide me with a
>list of roaming operators. First of all, how the network recognition
>works, is it based on a string that is broadcasted by the basestations
>i.e., how does my mobile recognize that there is a base station of my
>operator.
I can tell you how GSM networks do it. If you roam into an area not
covered by your home network your handset looks for networks that your
network operator has made a "roaming agreement." If the network(s)
that are found allow you to register you can use them (because your
home carrier has made a roaming agreement with the carrier that you
are visiting.) If no roaming agreement is present you cannot use that
network and only can make emergency (911/112) calls.
>When away from my operators coverage area, how does it recognize which
>networks have roaming agreements with my home operator. Is it something
>thats done more by the base station than by my mobile phone (e.g., it
>could be that my cell broadcasts saying 'i belong to this operator,
>anyone there')
It's likely that the handset sees what's broadcast and will try to log
onto a network (usually the strongest if there are more than one
permitted network.) If you are not allowed to roam onto any networks
you'll either get a "no service" message on your handset or on Nokia
you just won't see any operator name indicating that there's no
useable service that you can use.
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