Cellular Network Infrastructure » Radio Access Network » OsmoPCU

It has been noticed that at times osmo-bts, osmo-pcu are up and running on a sysmobts, GPRS is configured but there is no NS connection to the SGSN.

What I don't have about this:

• A method to reproduce.
• logs leading up to failure.
• I don't know if the NS was up and failed, or if it never came up on pcu startup.
• osmo-bts and pcu are not current master, if fact there are some various versions installed.. (BSC is nitb)

As I am writing this, I have one case of running osmo-pcu with no connection.

pcu is not logging ANYTHING. (logging level set-all debug)
version: OsmoPCU 0.8.0.152-b90d
show stats: all counters are zero.

ntib shows all of the "states" Oper 'Enabled', Admin 'Unlocked', Avail 'OK'
as does the associated pcu osmo-bts

also, shows PCU connected:

OpenBSC# show bts 2
BTS 2 is of sysmobts type in band GSM850, has CI 2 LAC 269, BSIC 63 (NCC=7, BCC=7) and 1 TRX
Description: (null)
PCU version 0.8.0.152-b90d connected

To possibly simplify a little:
It seems to be that the PCU is in a states where it "knows" that the NS is down

OsmoPCU# show ns
Encapsulation NS-UDP-IP     Local IP: 0.0.0.0, UDP Port: 0

yet it it not trying to bring it up.
Maybe the bts did not inform the PCU of the config?

show bts statistics: also all counters at ZERO.
all rate-counters are zero.

really looks like it was never initialised.

Maybe needless to say, but worth adding - systemctl restart osmo-pcu restores service.