The 'uplink' branch / Status update
laforge at gnumonks.org
Mon Mar 1 23:03:43 UTC 2010
After quite a bit of hacking on libosmocore as well as the various
parts of Osmocom-BB, I've now committed the latest state to the 'uplink'
branch of osmocom-bb.git.
I have decided to introduce RSL/RLL as the interface between Layer2(LAPDm)
and Layer3(04.08), as it is a clean protocol that we already understand
from the OpenBSC side.
You can see in src/host/layer2/src/osmocom_rslms.c how we receive
e.g. the 04.08 PAGING REQUEST and 04.08 IMMEDIATE ASSIGNMENT on the
PCH/AGCH inside RSL UNIT DATA INDICATION messages.
Please note the layer2/src/lapdm.c implementation is extremely incomplete,
particularly when it comes to ABM (asynchronous balanced mode) and I-frames.
It's full of FIXME's that I'll be working on as soon as possible.
However, the infrastructure now seems to be coming together and we basically
have everything in place for bi-directional transmission of data for SAPI0 and
SAPI3 for both DCCH and ACCH (limited to SDCCH/4 on combined CCCH on C0T0)
- 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)
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