From fca59bea770346cf1c1f9b0e00cb48a61b44a8f3 Mon Sep 17 00:00:00 2001 From: Harald Welte Date: Sun, 25 Oct 2015 21:00:20 +0100 Subject: import of old now defunct presentation slides svn repo --- 2009/foss-mobile_world-seville2009/html/mgp00056.txt | 13 +++++++++++++ 1 file changed, 13 insertions(+) create mode 100644 2009/foss-mobile_world-seville2009/html/mgp00056.txt (limited to '2009/foss-mobile_world-seville2009/html/mgp00056.txt') diff --git a/2009/foss-mobile_world-seville2009/html/mgp00056.txt b/2009/foss-mobile_world-seville2009/html/mgp00056.txt new file mode 100644 index 0000000..8cf9406 --- /dev/null +++ b/2009/foss-mobile_world-seville2009/html/mgp00056.txt @@ -0,0 +1,13 @@ +FOSS in the Mobile World +GSM Network Architecture + +GSM is a bit-synchronous network +it draws many analogies from ISDN and SDN +layer 2 modelled after Q.921 / LAPD +call signalling modelled Q.931 +but: many more protocols for mobility management, radio resources, ... +like all traditional Telco protocols: Intelligence in the network, not in the end nodes. + +GSM is a TDMA "nightmare" +e.g. you never know from/for whom data is without the timing context + -- cgit v1.2.3