Data Rate of EGPRS is Too Low

XINKE ZHANG xinke.zhang at
Sat Mar 3 12:18:52 UTC 2018

I'm sure that B210 has a GPSDO. I execute 'uhd_usrp_probe' to prove it.

My entire config files are attached here. Pls help check it. Thanks.

From: Neels Hofmeyr <nhofmeyr at>
Sent: Friday, March 2, 2018 3:01
Cc: osmocom-net-gprs at
Subject: Re: Data Rate of EGPRS is Too Low

On Thu, Mar 01, 2018 at 01:40:56PM +0000, XINKE ZHANG wrote:
> GPSDO is mounted upon the B210. And I executes this command "./osmo-trx -g -e".

Make sure that your B210 actually contains a GPSDO, I myself once thought I had
one, but all I did was connect a GPS antenna to a dead socket on the B210. So a
B210 even though it has a connector for a GPSDO may have no GPSDO inside...
Also the -g option won't tell you if there is no GPSDO inside, it'll just all
work the same as before, i.e. unreliably.

> My timeslot config is 3 TCH/F + 3 PDCH.

Would you mind posting your entire config...

I don't really remember what rates I got out of GPRS, IIRC about 10 kbyte/s
with 3 PDCH was the ballpark. I Never actually tried EGPRS but I assume it
should be at least marginally faster?? Does anyone else know more details?

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