[srslte-users] [Commercial UE] Impossible to see the created LTE network

Sat Jun 30 00:09:27 UTC 2018

Hi Vincent

I had similar issues with DLOU using B210 and similar setup. I used another laptop with a different USB controller chip and it was resolved. Perhaps you want to verify this with another hardware setup? 

Alan

Sent from my iPhone

> On 29 Jun 2018, at 5:13 PM, Richard Stenzel <richard.stenzel at hotmail.com> wrote:
> 
> Hi Vincent,
> 
> i have a few suggestions/ideas/comments:
> For me srsENB works relatively fine without an GPSDO, but you can never be sure especially different UEs might behave differently
> To set a frequency use only dl_earfcn parameter and don't set dl_freq and ul_freq, because this caused some problems for my commercial UE (there was also something missing in the source code for it to work properly but I will have to look what exactly was wrong)
> You set the bandwidth with n_prb, for me 25 (5MHz) worked best for testing because lower values sometimes resulted in wierd behaviour and higher is more demanding for your PC
> I suggest to set authentification algo to milenage
> If you work in a Faraday Cage I would check at first inside if you phone will find any commercial networks (it should not). Then set your MCC and MNC in eNB and EPC to a commercial network according to https://en.wikipedia.org/wiki/Mobile_country_code -> e.g. if you are in Switzerland set MCC to 228 and MNC to 01 and now your phone should "see" a Swisscom 4G Network. Be sure only to use this in a Faraday Cage as you are not allowed to use these MCC/MNC combination, but so you can try if it's just the phone which doesn't show Test Networks like 00101
> 
> Richard Stenzel
> From: srslte-users <srslte-users-bounces at lists.softwareradiosystems.com> on behalf of Falconieri Vincent <vincentf at student.ethz.ch>
> Sent: Wednesday, June 27, 2018 4:05 PM
> To: srslte-users at lists.softwareradiosystems.com
> Subject: [srslte-users] [Commercial UE] Impossible to see the created LTE network
>  
> Dear srsLTE community,
> 
> Since about one week, I'm trying to have a working setup (ENC + ENB + Commercial UE) : I want the UE to be able to connect to the ENB.
> Unfortunately, I can't get it working, even with reading most of the old SRSLTE_list e-mails, documentation provided and information found online.
> Sorry for the big e-mail, I tried to solved it by myself in vain, and tried to compile all available information once, here.
> 
> ## Setups
> I tried 2 setups, both on the same machine (Laptop ASUS FX550V, i5-6300HQ 3.2 Ghz + 8Gb RAM)
> 1. Arch-linux (performance mode for CPU, packets up to date) : 
>     + srsENC (compiled manually) 
>     + srsENB (compiled manually) 
>     + UHD (compiled manually and also from AUR repository. Right now :  UHD_3.11.1.0-0-unknown) 
>     + USRP B210 (default firmware downloaded via the python script provided, connected on USB 3.0) 
>     + 2 VERT900 antennas (connected on A:RX2 and A:RX/TX, 824 to 960 MHz, 1710 to 1990 MHz from documentation) 
>     + Samsung Galaxy S6 Edge+ (SM-G928F, not rooted)
> 2. Ubuntu 17.04 (performance mode for CPU, packets up to date, installed on a USB Key 3.0) : 
>     + srsENC (compiled manually) 
>     + srsENB (compiled manually) 
>     + UHD (from repo (v3.10 I guess) and also compiled manually with version UHD 3.12.0.HEAD-0-gec786351) 
>     + USRP B210 (default firmware downloaded via uhd_images_downloader, connected on USB 3.0) 
>     + 2 VERT900 antennas (connected on A:RX2 and A:RX/TX, 824 to 960 MHz, 1710 to 1990 MHz from documentation) 
>     + Samsung Galaxy S6 Edge+ (SM-G928F, not rooted)
> 
> ## Problems
> I can't see the created LTE network by the setup from the smartphone (Parameters > Mobile networks > Network operators > Networks lookup) even if the setup seems to work.
> I also tried to get more precise information with the help of apps like "Network Signal Guru", "G-NetTrack Lite", "Cell Signal Monitor" but without a rooted phone, it displays only information on the connected cell. (As I can't even detect mine, I can't get any information from these apps).
> The smartphone can see commercial network without problem. (At least 3 commercial networks listed outside Faraday cage)
> 
> ## Work
> srsENC : runs flawlessly. No errors in logs.
> 
> srsENB : connects correctly to srsENC. 
> * On setup 1. (=Arch) : A lot of UOSDL (even in performance mode), 
> The last errors I get, which I never resoled is : 
>     [ERROR] [STREAMER] recv packet demuxer unexpected sid 0x190038
>     [ERROR] [STREAMER] recv packet demuxer unexpected sid 0xfffe000e
> 
> * On setup 2. (=Ubuntu) : nearly no UOSDL. Still some entry in enb.log : 
>     12:57:55.434535 [RF  ] [W] Overflow
> No other errors displayed. No tentative of connection from UE in the logs.
>     
> * On both setups : Tried with out-of-the-box conf files, tried to increase gain (Tx 86, Rx 60), tried other earfcn (1800, 1949, 1600, ...), recompile srsENB with and without srsGUI, run with different version/source of uhd ...  without improvement.
> Enable pregenerate_signals allowed to get less UOSDL. Add some devices_args ("recv_frame_size=1024", ...) allowed to get new errors message, but not a working setup.
> 
> UHD Driver : "make test" only provides 1 error. "./tests_messages" outputs some errors : 
>     (In faraday cage with sudo)
>     Test Burst ACK    ->     9 successes,   2 failures
>     Test Underflow    ->     7 successes,   5 failures
>     Test Time Error   ->     4 successes,   7 failures
>     Test Late Command   ->    16 successes,   0 failures
> "./benchmark_rate --tx_rate 6.25e6 --rx_rate 6.25e6 --duration 30" gives no error on USB 3.0.
> Correctly detects the B210. 
> Can receive data from the USRP (./rx_ascii_art_dft --rate 1000000 --freq 1700 --rx-gain 60 gives a "moving graph")
> 
> USRP B210 Card : LEDs work correctly (blink of the LED in case of UOSDL), used by someone else, it worked for another project but not on these frequencies and not for this usage. 
> 
> Laptop : working for diverse other usages. Never used it for "real time hardware" applications (so USB 3.0 ports never tested in equivalent settings)
> Smartphone : working for daily usage. Roaming is working. 4G LTE verified. More details on frequencies this UE can handle : https://www.frequencycheck.com/models/vDm7R/samsung-sm-g928f-galaxy-s6-edge-lte-a-64gb-samsung-zen
> 
> ## Aside notes
> * All tests are conducted in a Faraday cage.
> * I may have access to another smartphone (that I can root) and might get another computer by the end of the week for further testing.
> * I have no GPSDO on the B210. It seems that some people (even in this list) managed to make it work without this. Am I making a mistake ? Is it mandatory ?
> * Monitoring the CPU gives 30% charge when EPC/ENB running, 10% without. Numerous L(ate),D(rop),O(verflow),U(ndeflow) in powersaving mode, nearly none in performance mode (but still some. 0 to 2 per minute in the best run I ever had).
> * USB 2.0 on the same machine provides a lot of UOSDL without improvement.
> * I have a configurable sim card (sysmocom) that I keep for later steps. Not used now.
> * Antennas are placed orthogonally from each other.
> * With the notes I took, and what I tested, I think I have enough to start a wiki .. we could talk about it when my problem will be solved, if you are interested. :)
> 
> 
> ## Questions 
> * Some gave the advice to reduce the bandwidth to 5 Mhz to prevent timing issues. Do we agree we can't control this parameter directly, but only through the number of ressource block ? (tried n_prb with almost all values displayed in the conf.example : 6,15,50, ...)
> * Do you know if mcc/mnc/tac/... should have a particular value to work with the commercial UE ? As far as I understand, it should be fine with default values, isn't it ? It should behave like roaming.
> * Do you have an idea of what can get wrong ? 
> 
> 
> ## Useful informations : 
> Some captures and complementary informations are joined to this e-mail. Feel free to ask anything I can try that could be relevant.
>     - Error with cache : with "pregenerate_signals" there is less UDLO, but still.
>     - Error_No_network_visible (2) : One run (as all the other, but this one has nothing else "special") where the smartphone can't see the network
>     - Error_Recv_packet_demuxer (2) : Runs where a major error occured. It seems that unpluging and repluging the card (so the firmware is copied again) solve the issue. Seems it happens when there is 2 runs in a row, with different enb.conf.
> I unfortunately did not manage to get a "nice and smooth" run today. I don't know why. If I managed to get one, I'll give you the logs.
>      
> Thanks for your time, 
> Hope we'll be able to find a solution or at least ideas to explore
> Best regards,
> F. Vincent
>        
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