forked from acouzens/open5gs
Document update for 'your first LTE'
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Sukchan Lee
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@ -8,12 +8,12 @@ This post is the perfect starting point for learning to build your own LTE netwo
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### Prerequisites
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---
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First, you have to prepare USRP B200/B210 to run srsENB. However, please keep in mind that you would still need a fairly high-end PC (at least dual-core i5, better quad-core i7) with USB 3.0 to attach the USRP B200/B210.
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First, you have to prepare USRP B200/B210 to run srsRAN. However, please keep in mind that you would still need a fairly high-end PC (at least dual-core i5, better quad-core i7) with USB 3.0 to attach the USRP B200/B210.
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For USRP B200/B210, you can use a GPS antenna for clock synchronization. Of course, it can work without a GPS antenna, but if you have that antenna, it's a good to have a window near your desk where you can put the small GPS patch antenna. In my case, a 1 to 2 meters antenna cable is used between desk/computer and the window.
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This document will be described with the following equipment.
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- i5-8500 PC with Ubuntu 18.04(bionic)
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- i5-8500 PC with Ubuntu 20.04(focal)
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- USRP B200/B210 with USB 3.0
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- iPhone XS
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- sysmoUSIM-SJS1
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@ -112,7 +112,7 @@ Done !
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### Installation
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---
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We will use *Ubuntu 18.04(Bionic)* installed PC.
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We will use *Ubuntu 20.04(focal)* installed PC.
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{: .blue .bold}
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#### 1. USRP Hardware Driver
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@ -131,9 +131,9 @@ After installing, you need to download the FPGA images packages by running _uhd
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$ sudo /usr/lib/uhd/utils/uhd_images_downloader.py
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```
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#### 2. srsENB
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#### 2. srsRAN
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On *Ubuntu 18.04(Bionic)*, one can install the required libraries with:
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On *Ubuntu 20.04(focal)*, one can install the required libraries with:
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```bash
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$ sudo apt install cmake libfftw3-dev libmbedtls-dev libboost-program-options-dev libconfig++-dev libsctp-dev
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@ -142,11 +142,11 @@ $ sudo apt install cmake libfftw3-dev libmbedtls-dev libboost-program-options-de
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Download and build srsLTE:
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```bash
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$ git clone https://github.com/srsLTE/srsLTE.git
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$ cd srsLTE
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$ git checkout release_19_12
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$ git clone https://github.com/srsRAN/srsRAN.git
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$ cd srsRAN
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$ git checkout release_21_04
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$ git rev-parse HEAD
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d045213fb9cbf98c83c06d7c17197a9dcbfddacf
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1c6dd8c4adc8419d4a431f382283539f1719582a
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$ mkdir build
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$ cd build
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$ cmake ../
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@ -161,11 +161,11 @@ The Open5GS package is available on the recent versions of *Ubuntu*.
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```bash
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# Getting the authentication key
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$ sudo apt install wget
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$ wget https://download.opensuse.org/repositories/home:/acetcom:/open5gs:/latest/xUbuntu_18.04/Release.key
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$ wget https://download.opensuse.org/repositories/home:/acetcom:/open5gs:/latest/xUbuntu_20.04/Release.key
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$ sudo apt-key add Release.key
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# Installing Open5GS
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$ sudo sh -c "echo 'deb https://download.opensuse.org/repositories/home:/acetcom:/open5gs:/latest/xUbuntu_18.04/ ./' > /etc/apt/sources.list.d/open5gs.list"
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$ sudo sh -c "echo 'deb https://download.opensuse.org/repositories/home:/acetcom:/open5gs:/latest/xUbuntu_20.04/ ./' > /etc/apt/sources.list.d/open5gs.list"
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$ sudo apt update
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$ sudo apt install open5gs
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```
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@ -320,46 +320,62 @@ $ sudo ip6tables -t nat -A POSTROUTING -s 2001:230:cafe::/48 ! -o ogstun -j MASQ
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**Note:** For the first time, it is a good condition if you do not have any rules in the IP/NAT tables. If a program such as docker has already set up a rule, you will need to add a rule differently.
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{: .notice--danger}
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#### 2. srsENB
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Change back to the srsENB source directory and copy the main config example as well as all additional config files for RR, SIB and DRB.
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#### 2. srsRAN
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Change back to the srsRAN source directory and copy the main config example as well as all additional config files for RR, SIB and DRB.
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```bash
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$ cp srsenb/enb.conf.example srsenb/enb.conf
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$ cp srsenb/rr.conf.example srsenb/rr.conf
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$ cp srsenb/sib.conf.example srsenb/sib.conf
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$ cp srsenb/drb.conf.example srsenb/drb.conf
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$ cp srsenb/sib.conf.example srsenb/sib.conf
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$ cp srsenb/sib.conf.mbsfn.example srsenb/sib.conf.mbsfn
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```
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You should check your phone frequency. If your phone does not support Band-3, you should use a different DL EARFCN value.
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```diff
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--- enb.conf.example 2018-11-19 18:16:06.953631893 +0900
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+++ enb.conf 2019-04-08 11:15:18.051261318 +0900
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@@ -23,8 +23,8 @@
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cell_id = 0x01
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phy_cell_id = 1
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tac = 0x0007
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$ diff -u enb.conf.example enb.conf
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--- enb.conf.example 2021-08-23 12:00:03.975297244 +0900
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+++ enb.conf 2021-08-23 14:34:01.794290668 +0900
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@@ -19,8 +19,10 @@
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#####################################################################
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[enb]
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enb_id = 0x19B
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-mcc = 001
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-mnc = 01
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+mcc = 310
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+mnc = 789
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+#mcc = 001
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+#mnc = 01
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+mcc = 901
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+mnc = 70
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mme_addr = 127.0.1.100
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gtp_bind_addr = 127.0.1.1
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s1c_bind_addr = 127.0.1.1
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@@ -66,12 +66,13 @@
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# Default "auto". B210 USRP: 400 us, bladeRF: 0 us.
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#####################################################################
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[rf]
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-dl_earfcn = 3400
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+dl_earfcn = 1600
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@@ -65,7 +67,7 @@
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tx_gain = 80
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rx_gain = 40
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#device_name = auto
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#device_args = auto
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+device_args="clock=external"
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#time_adv_nsamples = auto
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#burst_preamble_us = auto
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-#device_name = auto
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+device_name = auto
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# For best performance in 2x2 MIMO and >= 15 MHz use the following device_args settings:
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# USRP B210: num_recv_frames=64,num_send_frames=64
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@@ -80,6 +82,7 @@
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# Example for ZMQ-based operation with TCP transport for I/Q samples
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#device_name = zmq
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#device_args = fail_on_disconnect=true,tx_port=tcp://*:2000,rx_port=tcp://localhost:2001,id=enb,base_srate=23.04e6
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+device_args = clock=external
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#####################################################################
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```
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```diff
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$ diff -u rr.conf.example rr.conf
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diff rr.conf.example rr.conf
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61c61,62
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< dl_earfcn = 3350;
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---
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> // dl_earfcn = 3350;
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> dl_earfcn = 1600;
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```
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PLMN ID, DL EARFCN, and Device Argument are updated as belows.
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@ -372,14 +388,20 @@ Device Argument : Clock source from external GPS-DO
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If you do not use the GPS-DO, you should use:
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```diff
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#device_name = auto
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-#device_args = auto
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+device_args = auto
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#time_adv_nsamples = auto
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#burst_preamble_us = auto
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$ diff -u enb.conf.example enb.conf
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--- enb.conf.example 2021-08-23 14:32:35.585438813 +0900
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+++ enb.conf 2021-08-23 14:32:08.350450409 +0900
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@@ -82,7 +82,6 @@
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# Example for ZMQ-based operation with TCP transport for I/Q samples
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#device_name = zmq
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#device_args = fail_on_disconnect=true,tx_port=tcp://*:2000,rx_port=tcp://localhost:2001,id=enb,base_srate=23.04e6
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-device_args = clock=external
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#####################################################################
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# Packet capture configuration
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```
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Now, run the srsENB as follows:
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Now, run the srsRAN as follows:
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```bash
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$ cd srsenb/
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