OpenAirInterface 4G/LTE with LimeSDR_Mini

OS ubuntu 17.04

# apt-file search gtp.ko | grep lowlatency
linux-image-4.13.0-36-lowlatency: /lib/modules/4.13.0-36-lowlatency/kernel/drivers/net/gtp.ko
# apt install linux-image-4.13.0-36-lowlatency


SoapySDR

# git clone https://github.com/pothosware/SoapySDR
# apt-get install cmake g++ libpython-dev python-numpy swig
# mkdir build
# cd build
# cmake ..
# make -j4
# sudo make install
# sudo ldconfig #needed on debian systems
# SoapySDRUtil --info

LimeSuite
# sudo apt-get install git g++ cmake libsqlite3-dev libi2c-dev libusb-1.0-0-dev
#install graphics dependencies
sudo apt-get install libwxgtk3.0-dev freeglut3-dev
# git clone https://github.com/myriadrf/LimeSuite
# cd LimeSuite
# cd build
# cmake ..

Download & Compile the eNB on 17.04
# git clone https://github.com/myriadrf/trx-lms7002m
# wget http://open-cells.com/d5138782a8739209ec5760865b1e53b0/opencells-mods-20170710.tgz
# tar xf opencells-mods-20170710.tgz
# git clone https://gitlab.eurecom.fr/oai/openairinterface5g.git
# cd openairinterface5g
# git checkout 08b8b3142df16831396a5283a015564ff56bf91c
# git apply ../opencells-mods/eNB.patch
# source oaienv
# ./cmake_targets/build_oai -I
# ./cmake_targets/build_oai -c -w LMSSDR --eNB -x

Download and patch EPC
# cd
# git clone https://gitlab.eurecom.fr/oai/openair-cn.git
# cd openair-cn
# git checkout develop
# git apply opencells-mods/EPC.patch
# source oaienv; cd scripts
# ./build_hss -i

set your MySQL password and remember it!
Answer yes to install: freeDiameter 1.2.0
phpmyadminn choose apache, configure database for phpmyadmin with
dbconfig-common: yes, password: same as MySQL for simplicity

Install 3PP SW for mme and spgw

# ./build_mme -i

Do you want to install freeDiameter 1.2.0: no
Do you want to install asn1c rev 1516 patched? : no
Do you want to install libgtpnl ? : yes
wireshark permissions: as you prefer

# ./build_spgw -i

Do you want to install libgtpnl ? : no

Compile the EPC nodes
# cd ~/openair-cn; source oaienv; cd scripts
# ./build_hss
# ./build_mme
# ./build_spgw

# nano openairinterface5g/targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band7.tm1.25PRB.lmssdr.conf

Change tx_gain 127 and rx_gain 160 je careful i am not sure it is necessary and it is max values

Change to this
////////// MME parameters:
mme_ip_address = ( { ipv4 = “127.0.0.20”;
ipv6 = “192:168:30::17”;
active = “yes”;
preference = “ipv4”;
}
);

NETWORK_INTERFACES :
{
ENB_INTERFACE_NAME_FOR_S1_MME = “lo”;
ENB_IPV4_ADDRESS_FOR_S1_MME = “127.0.0.10/8”;

ENB_INTERFACE_NAME_FOR_S1U = “lo”;
ENB_IPV4_ADDRESS_FOR_S1U = “127.0.0.10/8”;
ENB_PORT_FOR_S1U = 2152; # Spec 2152
};

And this

In the eNB config file, you need also to set the MCC and MNC as per your SIM card:

tracking_area_code = “1”;
mobile_country_code = “208”;
mobile_network_code = “92”;

Install this configuration for EPC

For the EPC, we install in OAI default directory: /usr/local/etc/oai

# sudo mkdir -p /usr/local/etc/oai
# sudo cp -rp ~/opencells-mods/config_epc/* /usr/local/etc/oai

# cd ~/openair-cn; source oaienv; cd scripts
# ./check_hss_s6a_certificate /usr/local/etc/oai/freeDiameter hss.OpenAir5G.Alliance
# ./check_mme_s6a_certificate /usr/local/etc/oai/freeDiameter mme.OpenAir5G.Alliance

Only the SGi output to internet need to be configured.

# nano /usr/local/etc/oai/spgw.conf,

your should set the interface that is connected to Internet, and,
to tell to the PGW to implement NAPT for the UE traffic

PGW_INTERFACE_NAME_FOR_SGI = “wlp2s0”;
PGW_MASQUERADE_SGI = “yes”;

Change wlp2s0 with your interface

For the SIM card, you’ll have more to do:

SIM MCC/MNC should be duplicated in a couple of files
eNB: See above in eNB configuration chapter
MME file: /usr/local/etc/oai/mme.conf to update

GUMMEI_LIST = ( MCC=”208″ ; MNC=”92″; MME_GID=”4″ ; MME_CODE=”1″; } );
TAI_LIST = ({MCC=”208″ ; MNC=”92″; TAC = “1”; } );

A HSS database in text is in: opencells-mods/opencells_db.sql

for phpmyadmin
# sudo ln -s /usr/share/phpmyadmin /var/www/html

10 users is network 208/92 (a French test network) are also created

# nano /usr/local/etc/oai/hss.conf
HSS Configure the password for MySQL set password as the password you created during MySQL installation

uncomment #OPERATOR_key = “11111111111111111111111111111111”; # OP key matching your database

# cd ~/openair-cn/scripts
# ./hss_db_import 127.0.0.1 root linux oai_db ~/opencells-mods/opencells_db.sql

supposed your password is linux

program the Usim
apt-get install python-pyscard python-serial python-pip
pip install pytlv
to find ki matching you should k at startup of
# ./run_hss

to find opc
# ./auchss.py -o 11111111111111111111111111111111 -k 6874736969202073796D4B2079650A73

# sudo python pySim-prog.py –type=”sysmoUSIM-SJS1″ –mcc=208 –mnc=92 –imsi=208920100001108 –opc=777f0406a78d9598b0330d63f4c52199 –ki=6874736969202073796D4B2079650A73 –iccid=8988211000000227713 –pin-adm=40303607 –acc=0200

Change pin-adm=40303607 –acc=0200 with your own values

Running !!
# cd ~/openair-cn/scripts
# sudo ./run_hss
# sudo ./run_mme
# sudo ./run_spgw

# cd ~/openairinterface5g
# sudo -E targets/bin/lte-softmodem.Rel14 -O targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band7.tm1.25PRB.lmssdr.conf –rf-config-file ~/trx-lms7002m/config-limeSDR/LimeSDR_Mini_v06.ini -d

The last puzzle piece with the lousy bursty throughput and those log errors:

[PHY][W][eNB 0, CC 0] frame 733, subframe 4, UE 0: ULSCH consecutive error count reached 20, triggering UL Failure
[MAC][I][UL_failure_indication] [eNB 0][UE 0/80e6] Frame 733 subframeP 4 Signaling UL Failure for UE 0 on CC_id 0 (timer 0)
[PHY][E]ERROR: Format 1A: rb_alloc (1ff) > RIV_max (144)

was partly solved by using the lte-softmodem -d switch Enable soft scope and L1 and L2 stats (Xforms), since it was built with the -x –xforms option, and partly by randomly moving the phone around and noticing there was a sweet spot where Firefox would download and install very fast.
Good luck