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http://cgit.osmocom.org/openbsc/commit/?id=9507a7a1ea627e07370c9d264816bb190b3b91b8
commit 9507a7a1ea627e07370c9d264816bb190b3b91b8
Author: Ivan Kluchnikov <[email protected]>
Date: Wed Aug 23 18:09:50 2017 +0300
handover: Implement proper handover procedure handling at any stage of the
call
Enhancements for each stage of handover procedure should be implemented in
order to support handover at any stage of the call.
For these purposes new in_handover state and ho_queue for call control
messages was introduced for gsm_subscriber_connection.
Stage 1: HO-Command is sent to MS
gsm_subscriber_connection state should be changed to in_handover=1.
In this state all transmission of signalling layer messages (except RR
messages needed for handover procedure)
should be suspended until resuming is indicated.
All call control messages for connection received from network side should
be buffered in ho_queue.
All call control messages for connection received from MS side should be
ignored.
Channel mode modification procedures should be also suspended.
Stage 2: HO-Detect is received from MS
Audio path should be switched on network side.
Stage 3-1: HO-Complete is received from MS
Resumption procedure after successful handover should be performed:
- gsm_subscriber_connection state should be changed to normal
(in_handover=0).
- all buffered call control messages (ho_queue) should be sent to MS on
new lchan.
- suspended channel mode modification procedures should be performed on
new lchan.
Stage 3-2: HO-Fail is received from MS
Resumption procedure after failed handover should be performed:
- gsm_subscriber_connection state should be changed to normal
(in_handover=0).
- all buffered call control messages (ho_queue) should be sent to MS on
old lchan.
- suspended channel mode modification procedures should be performed on
old lchan.
Stage 3-3: T3103 expired: Handover has failed without HO-Complete or HO-Fail
Resumption procedure should not be performed in case of T3103 expired:
- gsm_subscriber_connection state should be changed to normal
(in_handover=0).
- all buffered call control messages (ho_queue) should be cleaned without
sending them to MS.
- suspended channel mode modification procedures should not be performed.
Change-Id: Icb9b5c35ef0c894af2ea762e539f1a9216447fb7
-----------------------------------------------------------------------
Summary of changes:
openbsc/include/openbsc/bsc_api.h | 1 +
openbsc/include/openbsc/gsm_data.h | 2 +
openbsc/src/libbsc/bsc_api.c | 19 +++
openbsc/src/libbsc/handover_logic.c | 35 +++---
openbsc/src/libmsc/gsm_04_08.c | 224 ++++++++++++++++++++++++++----------
5 files changed, 199 insertions(+), 82 deletions(-)
hooks/post-receive
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Legacy: The OpenBSC GSM Base Station Controller (+MSC/HLR/SGSN)
