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Bug #2700

Odd RTP behavior in case of bad / missing speech frames

Added by laforge 16 days ago.

Status:
New
Priority:
Normal
Assignee:
-
Category:
osmo-bts-trx
Target version:
-
Start date:
12/02/2017
Due date:
% Done:

0%

Spec Reference:

Description

I'm testing the osmo-bts-trx receiver behavior under a variety of conditions.

In case osmo-trx fails to send us some bursts, or in case such bursts are lost, we are seeing a behavior in which the RTP packets on Abis are sent in irregular intervals.

The normal behavior (all bursts from osmo-trx arriving) looks like this:

However, when 8 consecutive burst are dropped at every 10th 26-multiframe, we get:

So whenever the bursts are lost, we get the related RTP packets 44-48ms after the previous one, as opposed to the normal ~20ms

no_loss.png (96.5 KB) laforge, 12/02/2017 12:52 PM

8bursts_missing_every_10_mframes.png (179 KB) laforge, 12/02/2017 12:53 PM

8bursts_missing_every_10_mframes.pcapng (60.3 KB) laforge, 12/02/2017 12:53 PM

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