Searching \ for '[EE:] GSM personal cell site' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/index.htm?key=gsm+personal+cell
Search entire site for: 'GSM personal cell site'.

Exact match. Not showing close matches.
PICList Thread
'[EE:] GSM personal cell site'
2004\01\05@022127 by Russell McMahon

face
flavicon
face
Summary: Want to be able to implement a 1(or more) station GSM cell site.

Detail:    In order to implement a proof of concept demonstration I wish to
be able to communicate with a GSM phone - effectively to implement a single
phone capacity cell site. The phone should effectively see a standard GSM
network except that it will never experience "handover" as the cell will
either be on or off. (Operation will probably need to be in an RF proof
enclosure to stop the phone handing off to the nearest cell-site :-) ). TX
power would of course need to be strictly limited to prevent other unrelated
phones getting involved.

A quick Google reveals nothing except full blown portable sites used by
Telcos for outdoor events etc. These are far far too overkill for my purpose
(and no doubt expensive). I imagine the hacker community has this capability
and examples will be able to be found with enough digging.

Can anyone provide links to relevant material?
or does anyone have any practical experience in this area?

Mayhaps the easiest route in some countries would be to find an older tech
site that is being scrapped, but in this country that's unlikely to be an
option.


       Russell McMahon

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email spam_OUTlistservTakeThisOuTspammitvma.mit.edu with SET PICList DIGEST in the body

2004\01\05@090247 by Matt Redmond

picon face
Russell,

From your posts it isn't clear whether your ultimate product is on the 'cell
end' or on the 'phone end' of the link.  I know this doesn't answer the
question you asked, but if you just need to communicate with a GSM module so
you can build a device around it, most of the service providers have cheap
developer programs that will give you access to your phone/module via their
servers.

You might call the guys at Ramsey Electronics and see what they suggest -
they make test base stations for pagers - maybe GSM is on their list of
current projects?  http://www.ramseyelectronics.com

-matt redmond


{Original Message removed}

2004\01\05@134005 by Russell McMahon

face
flavicon
face
> From your posts it isn't clear whether your ultimate product is on the
'cell
> end' or on the 'phone end' of the link.

Ultimate product was not made clear :-).
But here's the desired functioanlity in more detail (from an offlist answer
to anothe rrespondent),.
_________________

I don't want to give the phone a real network - just make it think is has
one. ie the functionality I would like is "call it from the black box and it
rings and answers, call anyome from the phone and the black box handset
answers." ie

- On power on phone can wake up and see there is a (single) network signal
present (or not)

- if present it negotiates network access as usual.
Some of what it is told may be lies - as long as it doesn't know.

- If no signal present it sits there declaring no signal until signal
appears.

- If it makes a basic call to *anyone* it will SEEM to work - the call will
actually be terminated to a handset on the nano-cell-site. They will not
know, senor.

- If one wants to call it, it will see a standard "ringing" or whatever
signal with its ID therein. Answering protocol negototiated. Lies told as
required as long as it effectively doesn''t know.

- If there are more complex modes available they need not be implemented.
Good old apparent POTS is all that is required. SMS, GPRS, WAP  etc not
needed.

Any suggestion as to MINIMUM components from a full system that could be
persuaded to do the above would be useful.

__________________


> I know this doesn't answer the
> question you asked, but if you just need to communicate with a GSM module
so
> you can build a device around it, most of the service providers have cheap
> developer programs that will give you access to your phone/module via
their
> servers.
>
> You might call the guys at Ramsey Electronics and see what they suggest -
> they make test base stations for pagers - maybe GSM is on their list of
> current projects?  http://www.ramseyelectronics.com

Thanks - I'll check such leads.


       Russell McMahon

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email .....listservKILLspamspam@spam@mitvma.mit.edu with SET PICList DIGEST in the body

2004\01\05@141509 by Howard McGinnis

flavicon
face
At 08:06 PM 1/5/2004 +1300, you wrote:

>Summary: Want to be able to implement a 1(or more) station GSM cell site.
>
>
>Mayhaps the easiest route in some countries would be to find an older tech
>site that is being scrapped, but in this country that's unlikely to be an
>option.

It's prob not that far fetched here. I was looking at a two way paging
system for Vietnam and one of the reps said there is a lot of equipment
retired from service as companies merge, etc.

Howard

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listservspamKILLspammitvma.mit.edu with SET PICList DIGEST in the body

2004\01\07@062154 by Russell McMahon

face
flavicon
face
> Summary: Want to be able to implement a 1(or more) station GSM cell site.
>
> Detail:    In order to implement a proof of concept demonstration I wish
to
> be able to communicate with a GSM phone - effectively to implement a
single
> phone capacity cell site.


This seems to be pretty much what I am looking for.
A4 sized x 2.5 kg.
Made for short range indoor use.
The trick would be talking to it :-)
Wonder Now to find out what they cost ....


http://www.findarticles.com/cf_dls/m0ECZ/1999_March_2/53992125/p1/article.jhtml

       http://press.nokia.com/PR/199902/777263_5.html

       http://groups.yahoo.com/group/ec-twg/message/992?source=1

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

2004\01\07@073529 by ahid Sheikh

flavicon
face
Looks like an awesome device. Total power consumption of 20W!!!

www.nokia.com/networks/product_catalog/pc_product_highlights/1,69
29,,00.html?prod_id=RAS00010

A wild guess: its in the US$10,000 ~ 15,000 range.
Ever since you posted your original message I've been wondering if it
would be possible to write device drivers for something like the Nokia
CardPhone to do what you want to do. All the essential RF paths should
be there in that cardphone as well (or are they?)

If this is a one time requirement you may want to look into renting test
equipment that can simulate a GSM site. Rhode&Schwarz makes some killer
ones. I think they call them Universal Protocol Tester.

And what about those companies offering GSM to VoIP interface that are
popping all over Europe. What do they use to setup their sites?

Shahid

{Original Message removed}

2004\01\07@085756 by Simon Davies

flavicon
face
Try looking at the GSM gateways offered in Europe by companies such as Teles
AG in Germany. This site is in English and German:
http://www.teles-communication-systems.com/G1/G19500AN0_GSM_frame.html


Regards,

Simon



>And what about those companies offering GSM to VoIP interface that are
>popping all over Europe. What do they use to setup their sites?

Shahid

-----Original Message-----
From: Russell McMahon [.....apptechKILLspamspam.....PARADISE.NET.NZ]
Sent: Wednesday, January 07, 2004 3:45 PM
Subject: Re: [EE:] GSM personal cell site

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

2004\01\07@132346 by Josh Koffman

flavicon
face
Shahid Sheikh wrote:
> Ever since you posted your original message I've been wondering if it
> would be possible to write device drivers for something like the Nokia
> CardPhone to do what you want to do. All the essential RF paths should
> be there in that cardphone as well (or are they?)

I wouldn't bet on this. I once looked into hacking some Motorola iDEN
units, and the problem I found with most cell units is that they
transmit and receive on frequencies that aren't in the same range. I
don't know if this holds true for GSM though. IIRC for AMPS the
difference is 40MHz or so...but I'm not sure.

Josh
--
A common mistake that people make when trying to design something
completely foolproof is to underestimate the ingenuity of complete
fools.
       -Douglas Adams

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

2004\01\07@150750 by M. Adam Davis

flavicon
face
Do you intend this to work with any GSM phone with any configuration, or
do you have control over the phone's configuration?

The former would be considered intercepting a phone conversation, and
outside of legal issues which differ from country to country, I suspect
that the system has built in functionality to prevent someone from
simply setting up a cell site that is 'unregistered' or doesn't have the
proper keys (or however such functionality might work) to communicate
with a GSM phone not configured for use with that cell site.

I'd appreciate being proven wrong, however, as this would be quite a
vulnerability to the system.  Just think of the opportunities - I could
drive through downtown with my mobile cell site, and as phones switched
off to my 'tower' I could give them a short commercial until I was out
of range.  If their phone and their provider's system is robust enough
they may actually be connected to their previous conversation... but
probably not.

It'd also be easy to set one up in a theater, with a brief message about
not using cell phones in the theater.  etc, etc, etc.

If it's the latter, then I bet you'll have to bite the bullet and go for
the cheapest full tower setup you can get, and configure both the phone
and the tower to talk to each other.

Please let us know how your project goes...

-Adam

Russell McMahon wrote:

{Quote hidden}

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

More... (looser matching)
- Last day of these posts
- In 2004 , 2005 only
- Today
- New search...