## Installation and deployment of 5G Core (5GC) of Open Air Interface (OAI)
## Objectives
- Install and configure the 5GC of OAI in a virtual machine Ubuntu 20.04 LTS (Focal Fossa)
- Deploy 5GC Core
- Inspec 5G Core Docker containers by means of command line instructions 
- Install and configure Portainer tool
- Inspec 5G Core Docker containers by means of Portainer browser

**Minimum hardware requirements for OAI UE, according to doc/NR_SA_Tutorial_COTS_UE.md · develop · oai / openairinterface5G · GitLab (eurecom.fr):**
- Ubuntu 20.04.5 LTS;
- CPU: 4 cores x86_64;
- 8 GB RAM.

**Minimum hardware requirements for OAI 5GC and OAI gNB, according to doc/NR_SA_Tutorial_COTS_UE.md · develop · oai / openairinterface5G · GitLab (eurecom.fr):**
- Ubuntu 20.04.5 LTS;
- CPU: 8 cores x86_64 3.5 GHz;
- 32 GB RAM.

**However, if you do not have such hardware specifications, you may use the one below for both devices (tested for us, you may face some lags, but it works):**
- Ubuntu 20.04.5 LTS;
- CPU: 4 cores x86_64;
- 4 GB RAM.

## 5GC Installation

![ALT](/openairinterface5g/openairinterface-conf/fig/core_slice5g.png)  

In a Linux Terminal, follow the steps below:

**Step 0:** Setup your VM or Baremetal Machine, after install Useful Software:

> sudo su 
> 
> apt update -y 
> 
> apt upgrade -y
> 
> apt install -y python3-pip git curl cmake tree golang vim net-tools build-essential nfs-common openssh-server


**Step 1:** Install dependencies

> sudo apt-get install ca-certificates 
> 
> sudo apt-get install curl 
> 
> sudo apt-get install gnupg 
> 
> sudo apt-get install lsb-release 


**Step 2:** Enable packet forwarding

> sudo sysctl net.ipv4.conf.all.forwarding=1
> 
> sudo iptables -P FORWARD ACCEPT


**Step 3:** Install docker and docker-compose

> sudo rm /etc/apt/sources.list.d/docker.list*
> 
> sudo mkdir -p /etc/apt/keyrings 
> 
> curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
> 
> sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
> 
> sudo chmod a+r /etc/apt/keyrings/docker.gpg
> 
> sudo apt-get update
> 
> sudo apt-get install -y docker-ce docker-ce-cli containerd.io docker-compose-plugin
> 
> sudo curl -L https://github.com/docker/compose/releases/download/1.29.2/docker-compose-`uname -s`-`uname -m` -o /usr/local/bin/docker-compose
> 
> sudo chmod +x /usr/local/bin/docker-compose


**Step 4:** Clone OpenAirInterface 5G Core repository

> git clone https://gitlab.eurecom.fr/oai/cn5g/oai-cn5g-fed.git
> 
> cd oai-cn5g-fed
> 
> git checkout slicing-spring-of-code

## OAI 5G RAN, RIC (FlexRIC) and OAI UE Installations

![ALT](/openairinterface5g/openairinterface-conf/fig/ran_ric.png)  

## Objectives
- Install the OAI 5G RAN (gNB) 
- Install the FlexRIC 
- Install OAI UE

To install OAI RAN 5G and OAI UE, go back for /home/$your user$ and follow this tutorial.

**Step 0:** go back to /home/$your user$. In a Linux Terminal, type:

> sudo su
> 
> cd /home/$your user$

**Step 1:** Install dependencies

> sudo add-apt-repository ppa:ettusresearch/uhd
> 
> sudo apt-get install libuhd-dev uhd-host -y
> 
> sudo apt-get install libuhd4.6.0 -y
> 
> sudo apt-get install ccache -y
> 
> sudo apt-get install net-tools


**Step 2:** Fix problem in the libuhd. When you run the commands below, if you get the error "cannot access archive", you can continue to the next step.
sudo dpkg -i --force-overwrite /var/cache/apt/archives/libuhd4.6.0_4.6.0.0-0ubuntu1~focal1_amd64.deb

**Step 3:** Clone OpenAirInterface 5G RAN repository

> git clone https://gitlab.eurecom.fr/oai/openairinterface5g.git
>
> cd /home/$your user$/openairinterface5g
> 
> git checkout slicing-spring-of-code
> 
> **Step 4:** Run the installation script
> 
> source oaienv
> 
> cd cmake_targets
> 
> sudo ./build_oai -I 
> 
> sudo ./build_oai -I --install-optional-packages
> 
> sudo ./build_oai -w USRP --ninja --gNB --nrUE -C --build-lib "uescope nrscope telnetsrv" 

To install RIC (FlexRIC), go back to /home/$your user$ and follow this tutorial.

**Step 0:** go back to /home/$your user$. In a Linux Terminal, type:

> sudo su
> 
> cd /home/$your user$

**Step 1:** Install dependencies:

> sudo apt-get install -y autotools-dev automake g++ make libpcre2-dev byacc cmake python3-dev libsctp-dev pcre2-utils bison

**Step 2:** Install swig:

> cd /home/$your user$ 
>
> git clone https://github.com/swig/swig.git
> 
> cd swig
> 
> git checkout release-4.1 
> 
> ./autogen.sh
> 
> ./configure --prefix=/usr/
> 
> make -j8
> 
> sudo make install


**Step 3:** Clone FlexRIC repository:

> git clone https://gitlab.eurecom.fr/mosaic5g/flexric flexric
> 
> cd flexric/
> 
> git checkout slicing-spring-of-code
> 
> **Step 4:** Build FlexRIC:
> 
> mkdir build && cd build && cmake .. && make -j8
> 
> sudo make install

## UE 1 Configurations

## Objectives
- Configure the OAI UE 1

**Step 1:** Creating a namespace:

> sudo ip netns add oai-ue1

**Step 2:** Creating a pair of virtual interfaces (veth):

> sudo ip link add veth0 type veth peer name veth1

**Step 3:** Moving one interface to the created namespace:

> sudo ip link set veth1 netns oai-ue1

**Step 4:** Configuring an IP address for veth0 interface:

> sudo ip addr add 192.168.1.1/24 dev veth0

**Step 5:** Configuring an IP address for veth1 interface within the namespace:

> sudo ip netns exec oai-ue1 ip addr add 192.168.1.2/24 dev veth1

**Step 6:** Bringing up the veth0 interface:

> sudo ip link set veth0 up

**Step 7:** Bringing up the veth1 interface within the namespace:

> sudo ip netns exec oai-ue1 ip link set veth1 up

**Step 8:** Adding a route within the namespace:

> sudo ip netns exec oai-ue1 ip route add 192.168.70.0/24 via 192.168.1.1 dev veth1

**Step 9:** Enabling packet forwarding within the namespace:

> sudo ip netns exec oai-ue1 sysctl net.ipv4.conf.all.forwarding=1

**Step 10:** Setting default policy for packet forwarding within the namespace to ACCEPT::

> sudo ip netns exec oai-ue1 iptables -P FORWARD ACCEPT

## UE 2 Configurations

## Objectives
- Configure the OAI UE 2

**Step 1:** Creating a namespace:

> sudo ip netns add oai-ue2

**Step 2:** Creating a pair of virtual interfaces (veth):

> sudo ip link add veth1 type veth peer name veth2

**Step 3:** Moving one interface to the created namespace:

> sudo ip link set veth2 netns oai-ue2

**Step 4:** Configuring an IP address for veth1 interface:

> sudo ip addr add 192.168.1.1/24 dev veth1

**Step 5:** Configuring an IP address for veth1 interface within the namespace:

> sudo ip netns exec oai-ue2 ip addr add 192.168.1.2/24 dev veth2

**Step 6:** Bringing up the veth1 interface:

> sudo ip link set veth1 up

**Step 7:** Bringing up the veth1 interface within the namespace:

> sudo ip netns exec oai-ue2 ip link set veth2 up

**Step 8:** Adding a route within the namespace:

> sudo ip netns exec oai-ue2 ip route add 192.168.70.0/24 via 192.168.1.1 dev veth2

**Step 9:** Enabling packet forwarding within the namespace:

> sudo ip netns exec oai-ue2 sysctl net.ipv4.conf.all.forwarding=1

**Step 10:** Setting default policy for packet forwarding within the namespace to ACCEPT::

> sudo ip netns exec oai-ue2 iptables -P FORWARD ACCEPT

**Step 11:** Copy the UE file:

> cp /home/$your user$/openairinterface5g/targets/PROJECTS/GENERIC-NR-5GC/CONF/ue.conf /home/$your user$/openairinterface5g/targets/PROJECTS/GENERIC-NR-5GC/CONF/ue2.conf

## Scenario deployment

![ALT](/openairinterface5g/openairinterface-conf/fig/slice_deployment.png)  

## Objectives
- Deploy 5GC, 5G RAN, FlexRIC and OAI UE

Use a separate terminal for each of the following steps.

**Step 1:** Core deployment?

> cd /home/$your user$/oai-cn5g-fed/docker-compose
> 
> docker compose -f docker-compose-slicing-basic-nrf.yaml up -d 


Expected result:

After running the above command, nine containers are expected to be in the "Up (healthy)" state as shown in figure below.

![ALT](/openairinterface5g/openairinterface-conf/fig/results_deploy_core.png)  

**Step 2:** FlexRIC deployment:

> cd flexric/
>
> ./build/examples/ric/nearRT-RIC 

After running the above command the expect result is shown in figure below.

![ALT](/openairinterface5g/openairinterface-conf/fig/expected_result_flexric.png)  

**Step 3:** gNB deployment:

**Attention:** You must have Core 5G up and running

**Step 3.1:** gNB deploy:

> sudo su
> 
> cd /home/$your user$/openairinterface5g/cmake_targets/ran_build/build/
> 
> sudo RFSIMULATOR=server ./nr-softmodem --rfsim --sa -O ../../../targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band78.fr1.106PRB.usrpb210.conf --gNBs.[0].min_rxtxtime 6 --continuous-tx 

**Step 3.2**: To check the connection of gNodeB to the Core, see AMF logs. Open a terminal and use the command below: 

> docker logs -f oai-amf

The expected return is shown in figure below, where gNodeB shows the connected status.

![ALT](/openairinterface5g/openairinterface-conf/fig/gNB_config_06.png)  

**Step 4:** UE 1 deployment:

> sudo ip netns exec oai-ue1 bash
> 
> cd /home/$your user$/openairinterface5g/cmake_targets/ran_build/build/
> 
> sudo RFSIMULATOR=192.168.1.1 ./nr-uesoftmodem -r 106 --numerology 1 --band 78 -C 3619200000 --rfsim --sa --nokrnmod -O ../../../targets/PROJECTS/GENERIC-NR-5GC/CONF/ue.conf

**Step 5:** UE 2 deployment:

> sudo ip netns exec oai-ue2 bash
> 
> cd /home/$your user$/openairinterface5g/cmake_targets/ran_build/build/
> 
> sudo RFSIMULATOR=192.168.1.2 ./nr-uesoftmodem -r 106 --numerology 1 --band 78 -C 3619200000 --rfsim --sa --nokrnmod -O ../../../targets/PROJECTS/GENERIC-NR-5GC/CONF/ue2.conf