OsmocomBB hardware migration to SDR

Harald Welte laforge at gnumonks.org
Fri Jul 1 19:56:19 UTC 2016

On Tue, Jun 28, 2016 at 06:51:57PM +0600, Vadim Yanitskiy wrote:
> As I know, both L2 and L3 in 3G is the same as in 2G. Only L1 isn't.

Wrong.  Only some part of L3 is inherited (and significantly extended).

L2 is completely different, L1 and the radio modem couldn't be any more

The L3 "changes" on the PS side are bigger than those on the CS side.

UMTS is not one telphony system, but more like an arbitray number of
tools in a toolbox able to create any possible telephony system from it.
Try understanding the phyiscal channels, transport channels and
transport channel bundles of L2.  That alone is a nightmare of

- Harald Welte <laforge at gnumonks.org>           http://laforge.gnumonks.org/
"Privacy in residential applications is a desirable marketing option."
                                                  (ETSI EN 300 175-7 Ch. A6)

More information about the baseband-devel mailing list