Change in osmo-bsc[master]: Support Neighbor Address Resolution over PCUIF IPA multiplex

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pespin gerrit-no-reply at
Mon Sep 13 14:04:09 UTC 2021

Hello osmith, Jenkins Builder, laforge, 

I'd like you to reexamine a change. Please visit

to look at the new patch set (#4).

Change subject: Support Neighbor Address Resolution over PCUIF IPA multiplex

Support Neighbor Address Resolution over PCUIF IPA multiplex

While NACC was initially developed, it became clear there was need for
a way to interact PCU<->BSC in order resolve ARFCN+BSIC into CGI-PS
for later RIM usage.
Hence, this resolution was first (until today) implemented using an out
of bands RPC system using the CTRL interface, which required specific
config to be written and matches in osmo-pcu and osmo-bsc VTY (ip+port
of the CTRL interface to use).
However, this has several shortcomings:
* As explained above, specific configuration is required
* Since recently, we do support BSC redundancy in osmo-bts. Hence the BTS
  may switch to a BSC other than first one. If that happened, that'd mean
  the CTRL interface would still point to the initially configured one,
  which may not be the same currently serving the PCU.

During recent development of ANR related features, a similar need for
PCU<->BSC was required, but this time it was decided to extend the IPA
multiplex of the Abis OML connection to pass PCUIF messages,
transparently forwarded to each side by the BTS.
This has the advantage that connection PCU<->BTS is handled by BTS and
both sides send messages transparently.

Let's switch by default to using this new interface, while still
maintaing the old way for a while (announcing them as deprecated) to
avoid breaking existing deployments until they are upgraded to new
versions of osmo-pcu and osmo-bsc.

Change-Id: I9073a121564503f483c84263ac72476041e47c03
Related: SYS#4971
M doc/manuals/chapters/handover.adoc
M include/osmocom/bsc/neighbor_ident.h
M include/osmocom/bsc/pcuif_proto.h
M src/osmo-bsc/abis_osmo.c
M src/osmo-bsc/neighbor_ident.c
M src/osmo-bsc/neighbor_ident_vty.c
6 files changed, 190 insertions(+), 50 deletions(-)

  git pull ssh:// refs/changes/08/25408/4
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Gerrit-Project: osmo-bsc
Gerrit-Branch: master
Gerrit-Change-Id: I9073a121564503f483c84263ac72476041e47c03
Gerrit-Change-Number: 25408
Gerrit-PatchSet: 4
Gerrit-Owner: pespin <pespin at>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: laforge <laforge at>
Gerrit-Reviewer: osmith <osmith at>
Gerrit-MessageType: newpatchset
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