Re: [Openbts-discuss] Openbts-discuss Digest, Vol 78, Issue 34

[Sipos C. <sip...@kv...>]

Hi Arthur,

Actually I have seen traces of a version which actually implemented multiple ARFCN network with OpenBTS.

It was the masters thesis of Tom (I really enjoyed reading it), and you can find traces of it on github, but the actual repo is no longer available.

Ralph is right about even a single TX device like a B200 can support tenths of ARFCNs within its bandwidth limitation. For a B200 thats 32MHz which is a massive amount of ARFCNs (way more than 40 usable TCH/Fs :-) ).

As we talked about this previously: probably EDGE and multi-ARFCN would be the two bigges things to implement in OpenBTS.

Regards,
Csaba 

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Message: 2
Date: Sat, 21 Feb 2015 13:28:19 +0000
From: Arthur Rabat? <art...@gm...>
Subject: Re: [Openbts-discuss] Noob Question about multiple ARFCN
To: "Ralph A. Schmid, dk5ras" <ra...@sc...>,	Alexander Chemeris
	<ale...@gm...>, 	Michael Iedema
	<mic...@ra...>
Cc: ope...@li...
Message-ID:
	<CAM...@ma...>
Content-Type: text/plain; charset="utf-8"

Hi Ralph,

That I did understand, with up to 56Mhz of simultaneous bandwidth on both
tx and rx, we can have a lot of arcfns !!
Only processing and usb limitation can occur, but that will not be an issue
with 2 - 3 Mhz of signal.

*Is there an old "proof of concept" version of osmotrx supporting this ?
and if so can we try it out ?*
I have not been coding anything for a while, but I would try to work on it
in order to get something up and running.

B200 is working perfectly now, I have done figuring out what asterisk does,
yet still working on integrating softphones and pstn lines into the mi
(especially softphones, PSTN works well).

So: new aim : 40 usable TCH/F.