Regression in osmo-pcu with UHD trx ?

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Tom Tsou tom at tsou.cc
Thu Jun 16 01:03:29 UTC 2016


On Mon, May 30, 2016 at 2:58 AM, Saurabh Sharan
<Saurabh.Sharan at radisys.com> wrote:
>> Date: Fri, 27 May 2016 18:02:28 +0200
>> From: Pierre Baudry <pierre.baudry at diateam.net>
>> I noticed that since several weeks that osmo-pcu did not work as good as
>> previously.
>
> Yes we have also seen similar failures for GPRS calls in the osmo-pcu. Our setup uses NuRAN hardware with osmo-bts-sysmo

I can confirm the same behaviour on B200 using master branches of
osmo-pcu, osmo-bts-trx, and osmo-trx.

>> The latest "good" revision I am aware of is commit
>> d87e1d6ab747423d3668c74d16201a5d967accf0 (2015/12/14)

Confirm.

>> Can somebody confirm or reproduce this attitude ?
>
> The PCU log that we have during failure matches with the one you have reported.
> We have tried a workaround for this GPRS call failure by forcing two-phase-access in osmo-pcu.cfg.
> Based on our analysis done till now it seems One phase access of GPRS is broken.

Confirm matching PCU log and that enabling two-phase-access works
around the issue.

  -TT



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