Feature #1625

add loopback ping command to osmopcu

Added by msuraev almost 5 years ago. Updated 12 months ago.

Target version:
Start date:
Due date:
% Done:


Spec Reference:


Right now testing of traffic flow through osmopcu involves entire stack of sgsn, ggsn etc.
Would be nice to have vty command which could trigger simple ping-like traffic towards given imsi without waiting for external llc to arrive or phone to start network activity. This would create DL TBF and trigger UL TBF creation upon phone's response.

Open questions:
- interface: do we need anything more complex than "ping IMSI TIMES SIZE"?
- what to do if UL and/or DL TBF already exist for a given imsi? Easiest would be to just quit with warning.
- what kind of packet(s) shall we send to make sure phone will respond? We don't know phone's ip or it might not have one at all.


#1 Updated by laforge almost 5 years ago

I don't think this is the right approach, sorry.

an ICMP ping is so many layers higher than the PCU itself, (LLC, SNDCP, IP, ICMP) and far in the user plane. Also, you need the entire SM layer to establish a PDP context first on the signalling plane before sending user plane packets, and befor the user plane even has an IP address assigned.

I think what would more match the level of abstraction of a PCU was
a) the ability to send some kind of signalling LLC message(s) that trigger a response from the phone
b) the ability to send some specific messages for handset testing (I think I saw some references to that, but don't recall the details).

#2 Updated by laforge about 3 years ago

  • Priority changed from Normal to Low

#3 Updated by pespin 12 months ago

  • Status changed from New to Feedback
  • Assignee set to laforge

I'm not sure we need this ticket anymore since we hace TTCN3 test cases testing this kind of scenario in PCU_Tests_(RAW)? Like TC_mo_ping_pong, TC_paging_cs_from_bts, TC_paging_cs_from_sgsn_ptp, TC_paging_ps_from_sgsn_sign, etc.

laforge should we close this ticket?

#4 Updated by laforge 12 months ago

On Wed, Jan 22, 2020 at 02:39:07PM +0000, wrote:

laforge should we close this ticket?


Also available in: Atom PDF

Add picture from clipboard (Maximum size: 48.8 MB)