Change in osmo-sgsn[master]: Treat RAU as implicit RESUME if GMM is suspended

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pespin gerrit-no-reply at lists.osmocom.org
Wed Jun 17 12:22:11 UTC 2020


pespin has uploaded a new patch set (#2) to the change originally created by laforge. ( https://gerrit.osmocom.org/c/osmo-sgsn/+/18877 )

Change subject: Treat RAU as implicit RESUME if GMM is suspended
......................................................................

Treat RAU as implicit RESUME if GMM is suspended

We so far only resumed from suspend upon receiving an explicit BSSGP
RESUME message from the BSS.  The latter is only possible in
BSC-colocated PCU, where the BSC can trigger the message when releasing
the dedicated channel.  In BTS-colocated PCUs, this is not possible,
and we have to rely on the MS resuming by RAU.

See 3GPP TS 23.060 section 16.2.1.1.1 clause 6:

The MS shall resume GPRS services by sending a Routeing Area Update Request message to the SGSN:
* if the BSS did not successfully request the SGSN to resume GPRS services,
* if the RR Channel Release message was not received before the MS left dedicated mode,
* if the MS locally determines that the conditions for the GPRS suspension have disappeared

Without this patch, the GMM state would forever be stuck in SUSPEND,
which in turn causes the SGSN to page the MS all the time.

Change-Id: I3c09187a27483d95fa0070bbb467f94a2ea3978f
Related: OS4616
---
M src/sgsn/gprs_gmm_fsm.c
1 file changed, 8 insertions(+), 3 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-sgsn refs/changes/77/18877/2
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Gerrit-Project: osmo-sgsn
Gerrit-Branch: master
Gerrit-Change-Id: I3c09187a27483d95fa0070bbb467f94a2ea3978f
Gerrit-Change-Number: 18877
Gerrit-PatchSet: 2
Gerrit-Owner: laforge <laforge at osmocom.org>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: pespin <pespin at sysmocom.de>
Gerrit-MessageType: newpatchset
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