Cellular Network Infrastructure » OpenBSC » OsmoNITB

To clarify, we will most probably first have a standalone MSC for 3G operation
(osmo-cscn, #1595) and an A-interface will follow later, which will replace
osmo-nitb with a 2G and 3G capable osmo-cscn entirely.

neels wrote:

An MSC/BSC split will only be mergeable to master when a proper A interface has been implemented.
Work is ongoing, but it is hard to express this in a percentage, so leaving at 30% for now.

Correction: some commits that split MSC/BSC are already waiting to be submitted for review.
They introduce libxsc and separate the linking scopes without breaking osmo-nitb.
They will be submitted in the upcoming week(s) in the course of the IuCS patches.

Still, a split of osmo-nitb into osmo-cscn and osmo-bsc will only be merged to master when
a proper A interface is in place.

Some mscsplit patches are waiting in gerrit, possibly the 'libxsc' needs a different name though, IIUC
https://gerrit.osmocom.org/1123

The mscsplit commits waiting on gerrit have been modified to rename libxsc to libcommon-cs.

mscsplit commits are still waiting, now waiting specifically for a reply to comment on https://gerrit.osmocom.org/1129

Will merge the first couple of mscsplit commits soon (once the jenkins checks for the rebased patches are through).

the first part of the mscsplit branch is merged (actually the sysmocom/iu branch); as soon as patches https://gerrit.osmocom.org/1129 thru 1131 pass reviews, the remaining mscsplit commits will go through as well.

Next up in the mscsplit would be proper separation of gsm_network and gsm_subscriber_connection structs.

The commits currently have a build failure because some USSD generation code was moved to libosmocore, and hence the patches will build only when https://gerrit.osmocom.org/1339 and https://gerrit.osmocom.org/1340 are merged.

The mentioned series of mscsplit commits was merged to openbsc master.

Next up would be a separation of the gsm_network and gsm_subscriber_connection structs
into libbsc and libmsc parts.

After a brief discussion on the openbsc@ ML, the naming shall be
gsm_network --> bsc_ctx / msc_ctx
and
gsm_subscriber_connection --> bsc_subscr_conn / msc_subscr_conn

(Date: Fri, 11 Nov 2016 18:22:33 +0100, Subject: Re: naming contest: gsm_network, gsm_subscriber_connection)

On the vlr branch and in the queue for merge-to-master is a split of
the gsm_subscriber (note, not _connection) into struct bsc_sub and struct gprs_sub,
with complete replacement of the remaining gsm_subscriber with vlr_subscriber.

https://gerrit.osmocom.org/1682 (bsc_sub)
https://gerrit.osmocom.org/1684 (gprs_sub)

above patches reviewed and tested with real equipment,
now named bsc_subscr and gprs_subscr.

gprs_subscr patch is now merged to master, bsc_subscr patch still in discussion

while the points here remain valid, we're now tracking this in #1845 instead.