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Change subject: trxcon/l1sched: do not align Tx burst transmission
......................................................................
Patch Set 2: Code-Review+1
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Change subject: trxcon/l1sched: use variable names like in osmo-bts-trx
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Patch Set 3:
(1 comment)
Patchset:
PS3:
is this a purely cosmetic change? if so, indicate in the subject, please.
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Change subject: trxcon/l1sched: drop Tx prims for not supported TCH modes
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Patch Set 3: Code-Review+2
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fixeria has posted comments on this change. ( https://gerrit.osmocom.org/c/osmo-bts/+/33069 )
Change subject: trx TCH DL: transmit invalid speech frames instead of dummy FACCH
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Patch Set 1:
(2 comments)
File src/osmo-bts-trx/sched_lchan_tchf.c:
https://gerrit.osmocom.org/c/osmo-bts/+/33069/comment/0096fad3_a0351a92
PS1, Line 500: what is the correct BTS Tx behavior for frame
: * gaps in TCH/AFS
I guess we could indicate a bad frame via AMR's in-band signalling? Just an idea.
IIRC, this is what ip.access nanoBTS does in the absence of RTP frames.
See also: https://osmocom.org/issues/4823.
https://gerrit.osmocom.org/c/osmo-bts/+/33069/comment/db2c9660_e3ed2799
PS1, Line 505: gsm0503_tch_fr_encode
I suggest using a switch here:
```
switch (tch_mode) {
case GSM48_CMODE_SPEECH_V1:
case GSM48_CMODE_SPEECH_EFR:
rc = gsm0503_tch_fr_encode(*bursts_p, NULL, 0, 1);
if (rc == 0)
break;
/* fall-through */
default:
gsm0503_tch_fr_encode(*bursts_p, dummy, sizeof(dummy), 1);
chan_state->dl_facch_bursts = 8;
}
```
The reason why I am suggesting this, specifically the fall-through if `rc != 0`, is that the user may be running an older version of libosmocore, predating your patch `Iade3310e16b906efb6892d28f474a0d15204e861`. In this case `gsm0503_tch_fr_encode()` would return -1 and we will fall-back to FACCH rather than sending garbage.
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