Feature #3664
closedOptimize EDGE burst detection
100%
Description
In the current code, when EDGE demodulator is enabled, OsmoTRX is trying to detect
each normal burst as EDGE burst first, and fall-backs to GSM if detection is failed.
Transceiver::pullRadioVector():
...
/* Set time and determine correlation type */
GSM::Time time = radio_burst->getTime();
CorrType type = expectedCorrType(time, chan);
/* Enable 8-PSK burst detection if EDGE is enabled */
if (mEdge && (type == TSC))
type = EDGE;
...
Detection of EDGE bursts only makes sense on PDCH channel combinations,
and (probably, to be clarified) on TCH combinations that can be combined
with PDCH, i.e. dynamic time-slots.
Related issues
Updated by laforge over 5 years ago
On Mon, Oct 22, 2018 at 04:22:31PM +0000, fixeria [REDMINE] wrote:
Detection of EDGE bursts only makes sense on PDCH channel combinations,
ACK.
and (probably, to be clarified) on TCH combinations that can be combined
with PDCH, i.e. dynamic time-slots.
I think the channel combination should be switched/changed when the dyn TS changes?
If not, then that's probably a BTS bug?
Updated by pespin over 4 years ago
May be useful for optimization purposes, here's a perf output of a osmo-trx-uhd with EDGE network enabled (percentatge is absolute percentatge of samples):
- 37.20% 0.00% RxUpper0 osmo-trx-uhd [.] RxUpperLoopAdapter
- 37.20% RxUpperLoopAdapter
- 37.19% Transceiver::driveReceiveFIFO
- 37.11% Transceiver::pullRadioVector
- 35.69% detectAnyBurst
- 17.67% detectEdgeBurst
- detectGeneralBurst
- 10.00% detectBurst
- 9.10% downsampleBurst
- 5.93% Resampler::rotate
- 4.84% convolve_real
4.16% sse_conv_real16
- 1.23% signalVector::signalVector
- Vector<Complex<float> >::Vector
- Vector<Complex<float> >::resize
0.84% Complex<float>::Complex
1.19% Vector<Complex<float> >::copyToSegment
0.58% convolve
+ 7.38% maxAmplitude
- 16.24% analyzeTrafficBurst
- detectGeneralBurst
- 9.19% detectBurst
- 8.44% downsampleBurst
- 5.46% Resampler::rotate
- 4.58% convolve_real
3.93% sse_conv_real16
- 1.24% signalVector::signalVector
- 1.24% Vector<Complex<float> >::Vector
- Vector<Complex<float> >::resize
0.90% Complex<float>::Complex
1.17% Vector<Complex<float> >::copyToSegment
- 6.89% maxAmplitude
2.64% Vector<Complex<float> >::operator[]
1.50% Vector<Complex<float> >::size
0.57% Complex<float>::real
- 1.78% detectRACHBurst
- detectGeneralBurst
- 0.97% detectBurst
0.75% downsampleBurst
0.75% maxAmplitude
Updated by pespin over 4 years ago
- Status changed from New to Feedback
- Assignee set to fixeria
Related commit I wrote from what I understood was needed in this ticket:
https://gerrit.osmocom.org/c/osmo-trx/+/15291 Transceiver: Enable EDGE detection only on PDCH timeslots
Assigning to fixeria for review.
Updated by pespin over 4 years ago
- Related to Bug #4175: osmo-bts-trx: Make sure SETSLOT is sent to TRX on dynamic channels when they are switched added
Updated by fixeria over 4 years ago
- Status changed from Feedback to Resolved
- % Done changed from 0 to 100
Patch has been merged and confirmed to work, closing. Thanks, pespin!
