Attention is currently required from: pespin, fixeria, dexter.

Hello Jenkins Builder, fixeria, pespin, dexter,

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

https://gerrit.osmocom.org/c/osmo-bts/+/33069

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

Change subject: trx TCH DL: transmit invalid speech blocks instead of dummy FACCH ......................................................................

trx TCH DL: transmit invalid speech blocks instead of dummy FACCH

In speech TCH operation, there will always be times when a speech frame needs to be transmitted on the downlink, but there is no frame available to transmit (gap in the incoming RTP stream), or the logic of DTXd says that no frame shall be transmitted at this FN, but we are not doing physical DTXd. Previous osmo-bts-trx code sent dummy FACCH during such conditions, but this approach is bad for TCH/HS where we would like to transmit good speech frames or speech frame gaps one 20 ms frame at a time, rather than take out pairs of frames for dummy FACCH/H. Other BTS models (sysmoBTS PHY) send out invalid speech blocks with inverted CRC3 under the conditions in question - do the same in osmo-bts-trx.

The present change modifies osmo-bts-trx TCH DL frame gap behavior only for TCH/FS, TCH/HS and TCH/EFS; for all other channel modes, including AMR speech, the previous behavior of sending dummy FACCH is left unchanged.

Depends: Iade3310e16b906efb6892d28f474a0d15204e861 (libosmocore) Change-Id: I78106802a0aa4af39859c75d29fe0e77037899fe --- M src/osmo-bts-trx/sched_lchan_tchf.c M src/osmo-bts-trx/sched_lchan_tchh.c 2 files changed, 62 insertions(+), 2 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-bts refs/changes/69/33069/3