[srslte-users] Getting srsUE up and running

Wed Jul 27 13:08:28 UTC 2016

Switching to a different URSP B200 board (without GPSDO) seems to solve my issue, I have the following log now: 

Setting frequency: DL=2685.0 Mhz, UL=2565.0 MHz 
Searching for cell... 
Found CELL ID: 1 CP: Normal , CFO: 0.8 KHz. 
Trying to decode MIB... 
- Cell ID: 1 
- Nof ports: 1 
- CP: Normal 
- PRB: 50 
- PHICH Length: Normal 
- PHICH Resources: 1/6 
- SFN: 0 
MIB received BW=10 MHz 
Initializating cell configuration... 
Setting Sampling frequency 11.52 MHz 
SIB1 received, CellID=257, PLMN Id: MCC 901 MNC 70 
SIB2 received 
Random Access Transmission: seq=1, ra-rnti=2 
Random Access Transmission: seq=2, ra-rnti=2 
Random Access Transmission: seq=3, ra-rnti=2 
Random Access Transmission: seq=4, ra-rnti=2 
Random Access Transmission: seq=5, ra-rnti=2 
Random Access Transmission: seq=6, ra-rnti=2 
Random Access Transmission: seq=7, ra-rnti=2 
Random Access Transmission: seq=8, ra-rnti=2 
Random Access Transmission: seq=9, ra-rnti=2 
Random Access Transmission: seq=10, ra-rnti=2 
RRC Connection released. 

Although now I have a new issue to debug: why is the RRC connection released when it tries to connect to the network. 

Cheers, 
Domi 

> From: "Tomcsányi, Domonkos" <domi at tomcsanyi.net>
> To: "srslte-users" <srslte-users at lists.softwareradiosystems.com>
> Sent: Wednesday, July 27, 2016 2:44:47 PM
> Subject: Re: [srslte-users] Getting srsUE up and running

> I'm trying with 10 MHz BW....but still, MIB decoding fails most of the time and
> even if it succeeds then it fails to sync :(.

>> From: "Ismael Gomez" <ismael.gomez at softwareradiosystems.com>
>> To: "Tomcsányi," <domi at tomcsanyi.net>
>> Cc: "srslte-users" <srslte-users at lists.softwareradiosystems.com>
>> Sent: Wednesday, July 27, 2016 2:24:48 PM
>> Subject: Re: [srslte-users] Getting srsUE up and running

>> Exactly. With a 20 MHz signal is nearly impossible the the ue can proceed with
>> the decoding process. Can you try with a quadcore or reducing the bw to 10 MHz?
>> On Wed, 27 Jul 2016, 14:13 Tomcsányi,, < domi at tomcsanyi.net > wrote:

>>> Yes, I understand this, it makes sense. My only issue is that I can't get srsUE
>>> to decode MIB correctly, and also if once it finally detects the correct BW it
>>> fails to synchronize - with all frequency scaling changed to maximum
>>> performance.
>>> Is there any way to hard-code MIB data so at least that part is taken care of?
>>> Or is this a bad idea, because if MIB decoding fails it means the radio
>>> connection is such low quality between the eNB and the UE that there is no way
>>> it's going to work?

>>> Cheers,
>>> Domi

>>>> From: "Ismael Gomez" < ismael.gomez at softwareradiosystems.com >
>>>> To: "Tomcsányi," < domi at tomcsanyi.net >
>>>> Cc: "srslte-users" < srslte-users at lists.softwareradiosystems.com >

>>>> Sent: Wednesday, July 27, 2016 1:58:58 PM
>>>> Subject: Re: [srslte-users] Getting srsUE up and running

>>>> As I said before, in order to synchronize and decode the 20 MHz signal you'll
>>>> need a true 4-core system (your processor is 2-core). Notice that generating a
>>>> signal (what the eNodeB does) requires much less processing than decoding it
>>>> (what the UE does), this is why with the eNodeB it is possible to generate the
>>>> signal with the same laptop (probably not support high UL rates).

>>>> On Wed, 27 Jul 2016 at 13:52 Tomcsányi, < domi at tomcsanyi.net > wrote:

>>>>> Yes, it ran in 20 MHz mode, but I didn't do much of actual IP traffic, just an
>>>>> attach.
>>>>> So I rebooted my PC with SpeedStep and C states disabled, currently I'm having a
>>>>> hard time decoding the MIB. It still detects random BW values (right now it
>>>>> detected after many tries 1.4 MHz which is wrong again). I don't know what to
>>>>> do, will keep trying to adjust the gain settings maybe I can find a good value
>>>>> finally.

>>>>> Cheers,
>>>>> Domi

>>>>>> From: "Ismael Gomez" < ismael.gomez at softwareradiosystems.com >
>>>>>> To: "Tomcsányi," < domi at tomcsanyi.net >

>>>>>> Cc: "srslte-users" < srslte-users at lists.softwareradiosystems.com >
>>>>>> Sent: Wednesday, July 27, 2016 1:36:56 PM
>>>>>> Subject: Re: [srslte-users] Getting srsUE up and running

>>>>>> Hi Domi,
>>>>>> were you able to run OAI eNodeB in 20 MHz mode? With that processor, srsUE
>>>>>> should do full rate downlink in 10 MHz mode and support up to 35 Mbps. For 20
>>>>>> MHz bw and to reach 75 Mbps downlink you'll need a true 4-core processor.

>>>>>> On Wed, 27 Jul 2016 at 13:33 Tomcsányi, < domi at tomcsanyi.net > wrote:

>>>>>>> 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
>>>>>>>>> _______________________________________________
>>>>>>>>> srslte-users mailing list
>>>>>>>>> srslte-users at lists.softwareradiosystems.com
>>>>>>>>> http://www.softwareradiosystems.com/mailman/listinfo/srslte-users

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