Attention is currently required from: pespin, fixeria.
Hello Jenkins Builder, fixeria, pespin,
I'd like you to reexamine a change. Please visit
https://gerrit.osmocom.org/c/osmo-bts/+/33829
to look at the new patch set (#4).
Change subject: pcu_sock: forward downlink IMMEDAITE ASSIGNMENT with no IMSI to
AGCH
......................................................................
pcu_sock: forward downlink IMMEDAITE ASSIGNMENT with no IMSI to AGCH
When the SAPI PCU_IF_SAPI_PCH_DT is used, messages should include an
IMSI. However, there may be situations in the PCU where no IMSI is
available when sending an IMMEDIATE ASSIGNMENT through the PCH. In those
cases we cannot calculate the paging group. Even though it would work to
use the paging group 0, it is more appropriate to send the IMMEDIATE
ASSIGNMENT through the AGCH then. This would also offload the paging
channel (group 0). Also since the message will no longer have to go
through the paging queue, it is potentially scheduled a lot qicker,
which will reduce latency as well.
As a background information to this it should be noted that this works
because the IMSI is commonly not known during a GMM ATTACH REQUEST. In
this phase the MS is in non-DRX mode, which means that it listens on
all CCCH blocks (PCH and AGCH)
See also: 3gpp TS 44.060, section 5.5.1.5 and
3gpp TS 45.002, section 6.5.3, 6.5.6
Related: OS#6097
Change-Id: Iaa3e5cdcf86578821e149b3e23482a0bcee19f7b
---
M include/osmo-bts/bts.h
M src/common/bts.c
M src/common/pcu_sock.c
3 files changed, 72 insertions(+), 4 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/osmo-bts refs/changes/29/33829/4
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Gerrit-Project: osmo-bts
Gerrit-Branch: master
Gerrit-Change-Id: Iaa3e5cdcf86578821e149b3e23482a0bcee19f7b
Gerrit-Change-Number: 33829
Gerrit-PatchSet: 4
Gerrit-Owner: dexter <pma...@sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: fixeria <vyanits...@sysmocom.de>
Gerrit-Reviewer: pespin <pes...@sysmocom.de>
Gerrit-Attention: pespin <pes...@sysmocom.de>
Gerrit-Attention: fixeria <vyanits...@sysmocom.de>
Gerrit-MessageType: newpatchset
