[srslte-users] Getting srsUE up and running

Wed Jul 27 11:33:03 UTC 2016

Hi Ismael, 

Thanks for the quick reply. I'm using an i7-6500U CPU @ 2.5GHz. I'll try to disable frequency scaling and also set it to maximum performance, however I find it weird that I was able to run a full eNodeB with OpenAirInterface5G using the same hardware (laptop and B200) with the same frequency scaling settings and phones were able to connect to it fine. 
Also I asked my colleague who configured the eNB and it is set for 10 MHz bandwidth. 

I'll reboot now and disable frequency scaling in BIOS/EFI. 

Cheers, 
Domi 

> From: "Ismael Gomez" <ismael.gomez at softwareradiosystems.com>
> To: "Tomcsányi," <domi at tomcsanyi.net>, "srslte-users"
> <srslte-users at lists.softwareradiosystems.com>
> Sent: Wednesday, July 27, 2016 1:26:01 PM
> Subject: Re: [srslte-users] Getting srsUE up and running

> Hi Domi,
> It looks like it's a CPU issue. Make sure the CPU frequency scaling is disabled
> and the frequency governor is set to "performance" (ie fixed to maximum MHz).
> Also make sure you don't run other background processes. What sort of CPU are
> you using?

> Do you have access to the enodeb to try with a lower BW, like 10 MHz?

> On Wed, 27 Jul 2016 at 13:21 Tomcsányi, < domi at tomcsanyi.net > wrote:

>> Hi all,

>> I'm sorry if this has been asked before on the list, but I couldn't find any
>> info about this using Google, so I'm turning to you:
>> I'm trying to connect srsUE to an LTE test network consisting of a commercial
>> eNB and MME. All my phones can see the network, connect to it etc. but with
>> srsUE I see the following:

>> root at LTE:~/srs/srsUE/build/ue/src# ./ue ue.conf
>> linux; GNU C++ version 4.8.4; Boost_105400; UHD_003.009.003-release

>> --- Software Radio Systems LTE UE ---

>> Reading configuration file ue.conf...
>> Using srsLTE version 001.002.000
>> Opening USRP with args: type=b200,recv_frame_size=9232,send_frame_size=9232
>> -- Detected Device: B200
>> -- Operating over USB 3.
>> -- Detecting internal GPSDO.... Found an internal GPSDO
>> -- Initialize CODEC control...
>> -- Initialize Radio control...
>> -- Performing register loopback test... pass
>> -- Performing CODEC loopback test... pass
>> -- Asking for clock rate 16.000000 MHz...
>> -- Actually got clock rate 16.000000 MHz.
>> -- Performing timer loopback test... pass
>> -- Setting master clock rate selection to 'automatic'.
>> -- Asking for clock rate 32.000000 MHz...
>> -- Actually got clock rate 32.000000 MHz.
>> -- Performing timer loopback test... pass
>> Setting frequency: DL=2685.0 Mhz, UL=2565.0 MHz
>> Searching for cell...
>> Found CELL ID: 1 CP: Normal , CFO: 1.8 KHz.
>> Trying to decode MIB...
>> - Cell ID: 1
>> - Nof ports: 2
>> - CP: Normal
>> - PRB: 100
>> - PHICH Length: Normal
>> - PHICH Resources: 1/6
>> - SFN: 0
>> MIB received BW=20 MHz
>> Initializating cell configuration...
>> Setting Sampling frequency 23.04 MHz
>> No space for SSS/CP detection. Realigning frame...
>> No space for SSS/CP detection. Realigning frame...
>> No space for SSS/CP detection. Realigning frame...
>> Timeout while synchronizing SFN
>> No space for SSS/CP detection. Realigning frame...
>> No space for SSS/CP detection. Realigning frame...
>> Timeout while synchronizing SFN
>> No space for SSS/CP detection. Realigning frame...
>> No space for SSS/CP detection. Realigning frame...
>> Timeout while synchronizing SFN
>> No space for SSS/CP detection. Realigning frame...
>> Timeout while synchronizing SFN
>> No space for SSS/CP detection. Realigning frame...
>> No space for SSS/CP detection. Realigning frame...
>> No space for SSS/CP detection. Realigning frame...
>> Timeout while synchronizing SFN
>> Timeout while synchronizing SFN
>> No space for SSS/CP detection. Realigning frame...
>> No space for SSS/CP detection. Realigning frame...

>> I'm using an USRP B200 with GPSDO (so not the MIMO capable B210 version) as you
>> can see. I'm pretty sure my ue.conf is in tact, basically just modified the
>> frequency and the USIM parts of it. I tried to mess around with the gain
>> settings since the whole setup is on my table, so not much gain is needed in my
>> opinion, but that didn't change much. It is weird though that MIB decoding
>> gives different results each time I start srsUE. The attached log you can see
>> shows 20 MHz of BW, but it also detects 10 MHz regularly.
>> Also sometimes it just says "Error receiveing from UHD: 30" and then I need to
>> unplug and plug in the USRP to get it working again.

>> I hope you can shed some on this for a newbie like me.

>> Cheers,
>> Domi
>> _______________________________________________
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>> srslte-users at lists.softwareradiosystems.com
>> http://www.softwareradiosystems.com/mailman/listinfo/srslte-users
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