[srslte-users] srsUE sufferd scheduling request failed.

[Ismael Gomez]

Hi David,

Looking at your logs I see a problem with the Uplink. The Downlink is OK,
the SNR is very good and most of the packets are received OK. In the UL
however there are many NACKs on the PHICH, more or less ~50%, which means
that the signal is very poor at the ENB. Every once a while, the ENB does
not receive the SR signal from the UE (there are up to 4 attempts) and does
not allocate the corresponding UL grant therefore the UE assumes the
connection is lost and restarts RA procedure.

You can try to increase the maximum number of SR attempts at the ENB, but
I'd rather suggest that you improve the signal received at the ENB. How
does the constellation look like? You could try increasing the tx power at
the ue (param tx_power in ue.conf).

Cheers
Ismael

On Thu, 19 May 2016 at 10:11 David Yu ( III ) <wcyu at iii.org.tw> wrote:

> Hi SRS,
> We successfully connected to OAI network and to internet.
> But for a while, tt disconnected and show "scheduling request failed"
> almost every time.
> Could you help me analyze this issue?
> Thanks.
> Regards,
> David
> _______________________________________________
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> srslte-users at lists.softwareradiosystems.com
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>
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