[srslte-users] Getting srsUE up and running

Wed Jul 27 12:24:48 UTC 2016

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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