# OpenAirInterface enb unresponsive on Limesdr

**URL:** <https://discourse.myriadrf.org/t/openairinterface-enb-unresponsive-on-limesdr/3178>\
**Category:** RAN Forum\
**Created:** [17 August 2018 04:28 UTC](https://discourse.myriadrf.org/t/openairinterface-enb-unresponsive-on-limesdr/3178 "2018-08-17T04:28:03Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![hannan](https://avatars.discourse-cdn.com/v4/letter/h/b4bc9f/32.png) [@hannan](https://discourse.myriadrf.org/u/hannan)\
**Post date:** [17 August 2018 04:28 UTC](https://discourse.myriadrf.org/t/openairinterface-enb-unresponsive-on-limesdr/3178/1 "2018-08-17T04:28:03Z")

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hi,  
i have been following [myriadrf limesdr specific guide](https://wiki.myriadrf.org/OpenAirInterface_LTE) for OAI and also looking at multiple [solutions](https://discourse.myriadrf.org/t/how-to-install-limesdr-on-openinterface-enodeb/1487/4) available in this forum. i am getting 2 issues

1. sudo -E ./run\_spgw crashes with “ERROR in loading gtp kernel module” & " Initializing GTPv1-U ERROR"  
i did perform the lowlevel kernel installation but it didnt fix this issue

2. lte-softmodem.Rel14 just stays at “Entering ITTI signals handler” with limesdr acting as it isnt attached at all. (when i disconnected it same log appeared)

Lime is connectable via the suite, uhd\_find\_devices, and LimeUtils.  
attached is the log

* * *

> hannan@hannan:~/LTE/openairinterface5g$ sudo ./targets/bin/lte-softmodem.Rel14 -O targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band7.tm1.25PRB.lmssdr.conf --rf-config-file targets/ARCH/LMSSDR/LimeSDR\_above\_1p8GHz\_1v4.ini
> 
> [CONFIG] get parameters from libconfig targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band7.tm1.25PRB.lmssdr.conf , debug flags: 0x00000000  
> [CONFIG] function config\_libconfig\_init returned 0  
> [CONFIG] config module libconfig loaded  
> [LIBCONFIG] config: 1/1 parameters successfully set, (1 to default value)  
> /dev/cpu\_dma\_latency set to 0us  
> [LIBCONFIG] log\_config: 4/4 parameters successfully set, (4 to default value)  
> [LIBCONFIG] log\_config: 38/38 parameters successfully set, (38 to default value)  
> [LIBCONFIG] log\_config: 38/38 parameters successfully set, (38 to default value)  
> [LIBCONFIG] log\_config: 38/38 parameters successfully set, (38 to default value)  
> log init done  
> Reading in command-line options  
> Getting ENBSParams  
> [LIBCONFIG] (root): 2/2 parameters successfully set, (0 to default value)  
> [LIBCONFIG] list RUs not found in config file targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band7.tm1.25PRB.lmssdr.conf  
> Configuration: nb\_rrc\_inst 1, nb\_L1\_inst 1, nb\_ru 0  
> [LIBCONFIG] loader: 2/2 parameters successfully set, (2 to default value)  
> [LIBCONFIG] loader.NB\_IoT: 2/2 parameters successfully set, (1 to default value)  
> [LOADER] library libNB\_IoT.so is not loaded: libNB\_IoT.so: cannot open shared object file: No such file or directory  
> nb\_nbiot\_rrc\_inst 0, nb\_nbiot\_L1\_inst 0, nb\_nbiot\_macrlc\_inst 0  
> [LIBCONFIG] TTracer: 4/4 parameters successfully set, (4 to default value)  
> configuring for RAU/RRU  
> CPU Freq is 3.408310  
> ITTI init  
> reported resolution = 1 ns  
> Before CC  
> Runtime table  
> NO deadline scheduler  
> [LIBCONFIG] (root): 2/2 parameters successfully set, (0 to default value)  
> [LIBCONFIG] eNBs.[0].NETWORK\_INTERFACES: 3/3 parameters successfully set, (0 to default value)  
> ITTI tasks created  
> [LIBCONFIG] (root): 2/2 parameters successfully set, (0 to default value)  
> [LIBCONFIG] NETWORK\_CONTROLLER: 6/6 parameters successfully set, (6 to default value)  
> Wait for the ITTI initialize message  
> XFORMS  
> [LIBCONFIG] L1s.[0]: 9/9 parameters successfully set, (7 to default value)  
> Initializing northbound interface for L1  
> [LIBCONFIG] MACRLCs.[0]: 21/21 parameters successfully set, (17 to default value)  
> sched mode = default 0 [default]  
> [LIBCONFIG] (root): 2/2 parameters successfully set, (0 to default value)  
> [LIBCONFIG] eNBs.[0]: 14/14 parameters successfully set, (8 to default value)  
> RRC 0: Southbound Transport local\_mac  
> [LIBCONFIG] eNBs.[0].component\_carriers.[0]: 107/107 parameters successfully set, (47 to default value)  
> phich.resource 0 (ONESIXTH), phich.duration 0 (NORMAL)  
> [LIBCONFIG] eNBs.[0].srb1\_parameters: 6/6 parameters successfully set, (0 to default value)  
> [LIBCONFIG] (root): 2/2 parameters successfully set, (0 to default value)  
> [LIBCONFIG] eNBs.[0]: 14/14 parameters successfully set, (8 to default value)  
> [LIBCONFIG] eNBs.[0].mme\_ip\_address.[0]: 4/4 parameters successfully set, (0 to default value)  
> [LIBCONFIG] eNBs.[0].SCTP: 2/2 parameters successfully set, (0 to default value)  
> [LIBCONFIG] eNBs.[0].NETWORK\_INTERFACES: 5/5 parameters successfully set, (0 to default value)  
> [LIBCONFIG] (root): 2/2 parameters successfully set, (0 to default value)  
> [LIBCONFIG] eNBs.[0].NETWORK\_INTERFACES: 3/3 parameters successfully set, (0 to default value)  
> [LIBCONFIG] loader.coding: 2/2 parameters successfully set, (1 to default value)  
> [LOADER] library libcoding.so successfully loaded  
> NFAPI MODE:MONOLITHIC  
> START MAIN THREADS  
> RC.nb\_L1\_inst:1  
> Initializing eNB threads single\_thread\_flag:1 wait\_for\_sync:0  
> wait\_eNBs()  
> Waiting for eNB L1 instances to all get configured … sleeping 50ms (nb\_L1\_inst 1)  
> RC.nb\_L1\_CC[0]:1  
> eNB L1 are configured  
> About to Init RU threads RC.nb\_RU:0  
> wait RUs  
> ALL RUs READY!  
> RC.nb\_RU:0  
> ALL RUs ready - init eNBs  
> Not NFAPI mode - call init\_eNB\_afterRU()  
> pcfich\_reg : 0,12,25,37  
> ALL RUs ready - ALL eNBs ready  
> Sending sync to all threads  
> TYPE TO TERMINATE  
> Entering ITTI signals handler \<---- just stays here with no response

below is the output for reference that limesdr is properly connected

> hannan@hannan:~/LTE/openairinterface5g$ uhd\_find\_devices
> 
> [INFO] [UHD] linux; GNU C++ version 5.4.0 20160609; Boost\_105800; UHD\_3.11.0.git-776-gdca39145  
> – UHD Device 0  
> Device Address:  
> serial: 0009060B00472728  
> addr: 1d50:6108  
> driver: lime  
> label: LimeSDR-USB [USB 3.0] 9060B00472728  
> media: USB 3.0  
> module: FX3  
> name: LimeSDR-USB  
> type: soapy

LimeSuite Version 18.06  
Ubuntu 16.04

MME & HSS are working with connected enbs = 0

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**Author:** ![andrewback](https://avatars.discourse-cdn.com/v4/letter/a/22d042/32.png) [@andrewback](https://discourse.myriadrf.org/u/andrewback)\
**Post date:** [17 August 2018 07:51 UTC](https://discourse.myriadrf.org/t/openairinterface-enb-unresponsive-on-limesdr/3178/2 "2018-08-17T07:51:52Z")

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> [@hannan](#):
>
> sudo -E ./run\_spgw crashes with “ERROR in loading gtp kernel module” & " Initializing GTPv1-U ERROR"
> 
> i did perform the lowlevel kernel installation but it didnt fix this issue

Right, so this looks like it’s completely unrelated to LimeSDR hardware. Given you have this issue and unless someone replies with remedies for (2), I would suggest posting to the OpenAirInterface list/forum.

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**Author:** ![hannan](https://avatars.discourse-cdn.com/v4/letter/h/b4bc9f/32.png) [@hannan](https://discourse.myriadrf.org/u/hannan)\
**Post date:** [20 August 2018 05:34 UTC](https://discourse.myriadrf.org/t/openairinterface-enb-unresponsive-on-limesdr/3178/3 "2018-08-20T05:34:12Z")

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For part 1 will post here if i find a solution at OAI/forum. The 2nd part is still an issue and i am hoping for a solution !!

thanks in advance !!

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**Author:** ![ITrue](https://avatars.discourse-cdn.com/v4/letter/i/b38774/32.png) [@ITrue](https://discourse.myriadrf.org/u/ITrue)\
**Post date:** [22 August 2018 09:26 UTC](https://discourse.myriadrf.org/t/openairinterface-enb-unresponsive-on-limesdr/3178/4 "2018-08-22T09:26:52Z")

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Hi Hannan,

1. This means that your kernel version is too old - you need at least 4.7. Anything lower will simply not work, as the GTP module doesn’t exist in earlier versions.

2. I assume you’re using the develop branch? Unfortunately the documentation is wildly out of date, especially for the LimeSDR. The configuration file is missing a few sections that are required for the newer OAI versions. You can follow the instructions in this thread to get it up and running (click “I am not a spammer”, then go to the link again, as the button will redirect you to the home page): [https://lists.eurecom.fr/sympa/arc/openair5g-user/2018-08/msg00089.html](https://lists.eurecom.fr/sympa/arc/openair5g-user/2018-08/msg00089.html). Although I still can’t get any UEs to connect to the eNB, it does actually start up and broadcast.

Hope that helps!

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<div class="post-metadata">

**Author:** ![hannan](https://avatars.discourse-cdn.com/v4/letter/h/b4bc9f/32.png) [@hannan](https://discourse.myriadrf.org/u/hannan)\
**Post date:** [24 August 2018 06:15 UTC](https://discourse.myriadrf.org/t/openairinterface-enb-unresponsive-on-limesdr/3178/5 "2018-08-24T06:15:26Z")

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Itrue ,

thanks for the Fix !!

1. i am using 4.4 so will update that

2. Even though shifting from the develop branch to master branch seems to fix the current problem and limesdr connects it gives multiple issue after that… i will try using your method and hope it fixes the issue without other probs!