Change in osmo-bsc[master]: Send EUTRAN neighs based on whether Common Id msg contained Last used...

[pespin]

Hello Jenkins Builder, dexter, 

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

    https://gerrit.osmocom.org/c/osmo-bsc/+/23734

to look at the new patch set (#3).

Change subject: Send EUTRAN neighs based on whether Common Id msg contained Last used E-UTRAN PLMN ID
......................................................................

Send EUTRAN neighs based on whether Common Id msg contained Last used E-UTRAN PLMN ID

>From 3GPP TS 48.008 sec 3.1.30 "Common ID":
"""
If the SCCP connection is established due to CSFB from E-UTRAN and the MSC supports
return to the last used PLMN after CS fallback, then it should send the COMMON ID message
to the BSS including the Last used E-UTRAN PLMN ID information element if available at
the MSC immediately following the successful SCCP connection setup.
"""

Furthermore, 3GPP TS 48.008 version 16.0.0 Release 16 "3.2.1.21 CLEAR COMMAND",
for field CSFB Indication, states:
"""
NOTE: This information element doesn't serve any useful purpose. MSCs should not send the
information element unless it is required by the recipients (due to the need to interwork
with older versions of the protocol). It is expected that in future versions of the present
document, this information element will be deleted from this message.
"""

Hence, build up the EUTRAN neighbor list based on whether we received
the Last E-UTRAN PLMN ID IE during Common Id. In the future, we should
probably filter the list while populating it based on the received IE.

This change will also allow reusing same mechanism for SRVCC
EUTRAN->GERAN support, where te Last E-UTRAN PLMN ID IE can be found
inside "Old BSS to New BSS information" IE in msg HANDOVER REQUEST.

Related: SYS#5337
Change-Id: I5d290ac55eca5adde1c33396422f4c10b83c03d5
---
M include/osmocom/bsc/bsc_subscr_conn_fsm.h
M include/osmocom/bsc/bsc_subscriber.h
M include/osmocom/bsc/gsm_data.h
M src/osmo-bsc/bsc_subscr_conn_fsm.c
M src/osmo-bsc/gsm_04_08_rr.c
M src/osmo-bsc/osmo_bsc_bssap.c
6 files changed, 16 insertions(+), 25 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-bsc refs/changes/34/23734/3
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Gerrit-Project: osmo-bsc
Gerrit-Branch: master
Gerrit-Change-Id: I5d290ac55eca5adde1c33396422f4c10b83c03d5
Gerrit-Change-Number: 23734
Gerrit-PatchSet: 3
Gerrit-Owner: pespin <pespin at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: dexter <pmaier at sysmocom.de>
Gerrit-MessageType: newpatchset
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