Project

General

Profile

Bug #1950

LC15: BTS does not send L2 fill frame

Added by mqng2 11 months ago. Updated 10 days ago.

Status:
New
Priority:
High
Assignee:
Category:
osmo-bts-litecell15
Target version:
-
Start date:
02/13/2017
Due date:
% Done:

0%

Spec Reference:

Description

We have noticed that the LC15 BTS does not send L2 fill frame in case there is nothing to transmit.
This leads to bad RXQUAL repored by MS during signaling in TCH channel. Please refer to GSM 05.08, section 8.3

"On any TCH this subset of TDMA frames is always used for transmission during DTX. For speech, when
no signalling or speech is to be transmitted these TDMA frames are occupied by the SID (Silence
Descriptor) speech frame, see TS GSM 06.12 and TSM GSM 06.31 for detailed specification of the SID
frame and its transmission requirements. In other cases when no information is required to be transmitted,
e.g. on data channels, the L2 fill frame (see GSM 04.06 section 5.4.2.3) shall be transmitted as a FACCH
in the TDMA frame subset always to be transmitted.

On the SDCCH and on the half rate speech traffic channel in signalling only mode DTX is not allowed. In
these cases and during signalling on the TCH when DTX is not used, the same L2 fill frame shall be
transmitted in case there is nothing else to transmit."

History

#1 Updated by laforge 17 days ago

Hi Minh, what is the status of this bug report from almost one year ago? Can you please update us? Thanks!

#2 Updated by mqng2 13 days ago

laforge wrote:

Hi Minh, what is the status of this bug report from almost one year ago? Can you please update us? Thanks!

Hi Harald,

This bug was fixed in our public repository in the following commit

https://gitlab.com/nrw_noa/osmo-bts/commit/b32834b0e89ee987ff00e38041bd5683eea3cefd

I forgot to submit it to gerrit at that time. Do you want to submit it to gerrit?

#3 Updated by laforge 11 days ago

Hi Minh,

On Mon, Jan 08, 2018 at 02:38:21PM +0000, mqng2 [REDMINE] wrote:

This bug was fixed in our public repository in the following commit

https://gitlab.com/nrw_noa/osmo-bts/commit/b32834b0e89ee987ff00e38041bd5683eea3cefd

I forgot to submit it to gerrit at that time. Do you want to submit it to gerrit?

It would be great if we could all work together, including Nutaq / Nuran making sure
that bug fixes are submitted to upstream osmocom. It is a collaborative software
development project, which only works if people actually collaborate :)

Thanks a lot, it is appreciated.

#4 Updated by mqng2 10 days ago

Hi Harald,

The patch has been submitted to gerrit https://gerrit.osmocom.org/#/c/5753

#5 Updated by laforge 10 days ago

On Thu, Jan 11, 2018 at 02:51:44PM +0000, mqng2 [REDMINE] wrote:

The patch has been submitted to gerrit https://gerrit.osmocom.org/#/c/5753

Thanks!

#6 Updated by laforge 10 days ago

  • Assignee set to stsp

Also available in: Atom PDF