[M] Change in osmo-bts[master]: Transmit invalid AMR speech blocks instead of dummy FACCH

Attention is currently required from: fixeria, jolly, pespin. Hello Jenkins Builder, falconia, fixeria, pespin, I'd like you to reexamine a change. Please visit https://gerrit.osmocom.org/c/osmo-bts/+/35132?usp=email to look at the new patch set (#6). The following approvals got outdated and were removed: Code-Review+1 by fixeria, Code-Review+1 by pespin, Verified+1 by Jenkins Builder Change subject: Transmit invalid AMR speech blocks instead of dummy FACCH ...................................................................... Transmit invalid AMR speech blocks instead of dummy FACCH Every BTS needs to have some graceful handling for the scenario where it is time to send out a speech frame on TCH DL, but there is no frame to be sent. One possible solution is to transmit dummy FACCH, but this option is unattractive for TCH/AHS where FACCH displaces two speech frames rather than one. A more elegant solution is to emit a speech frame that is bad, causing the MS receiver to declare a BFI condition to trigger substitution and muting procedure. A bad frame is generated by gsm0503_tch_{afs,ahs}_encode() by setting the payload length to 0. Depends: libosmocore.git I82ce2adf995a4b42d1f378c5819f88d773b9104a Related: OS#6049 Change-Id: I056f379715c91ad968f198e112d363a9009dc1c3 --- M src/osmo-bts-trx/sched_lchan_tchf.c M src/osmo-bts-trx/sched_lchan_tchh.c 2 files changed, 57 insertions(+), 8 deletions(-) git pull ssh://gerrit.osmocom.org:29418/osmo-bts refs/changes/32/35132/6 -- To view, visit https://gerrit.osmocom.org/c/osmo-bts/+/35132?usp=email To unsubscribe, or for help writing mail filters, visit https://gerrit.osmocom.org/settings Gerrit-Project: osmo-bts Gerrit-Branch: master Gerrit-Change-Id: I056f379715c91ad968f198e112d363a9009dc1c3 Gerrit-Change-Number: 35132 Gerrit-PatchSet: 6 Gerrit-Owner: jolly <andreas(a)eversberg.eu> Gerrit-Reviewer: Jenkins Builder Gerrit-Reviewer: falconia <falcon(a)freecalypso.org> Gerrit-Reviewer: fixeria <vyanitskiy(a)sysmocom.de> Gerrit-Reviewer: pespin <pespin(a)sysmocom.de> Gerrit-Attention: jolly <andreas(a)eversberg.eu> Gerrit-Attention: pespin <pespin(a)sysmocom.de> Gerrit-Attention: fixeria <vyanitskiy(a)sysmocom.de> Gerrit-MessageType: newpatchset