# 5. Explanations on the configuration in the `docker-compose.yaml` #
## 5.1. Making the NR-UE connect to the core network ##
The NR-UE **SHALL** be provisioned in the core network, especially in the `SQL` database and in the `AMF`.
* in AMF section of `docker-compose.yaml` --> `OPERATOR_KEY=c42449363bbad02b66d16bc975d77cc1`
* in NR-UE section --> `OPC: 'C42449363BBAD02B66D16BC975D77CC1'
Both values shall match!
This value is also present in the `oai_db.sql` file:
```bash
INSERT INTO `users` VALUES ('208990100001100','1','55000000000000',NULL,'PURGED',50,40000000,100000000,47,0000000000,1,0xfec86ba6eb707ed08905757b1bb44b8f,0,0,0x40,'ebd07771ace8677a',0xc42449363bbad02b66d16bc975d77cc1);
```
As you can see, 2 other values shall match in the NR-UE section of `docker-compose.yaml`:
* `FULL_IMSI: '208990100001100'`
* `FULL_KEY: 'fec86ba6eb707ed08905757b1bb44b8f'`
We are also using a dedicated `oai-smf.conf` for the `SMF` container: the `oai` DNN shall match the one in the NR-UE section of `docker-compose.yaml` (`DNN: oai`).
## 5.2. Making the gNB connect to the core network ##
Mainly you need to match the PLMN in `gNB`, `AMF` and `SPGWU` parameters:
- The `-I` option is to install pre-requisites, you only need it the first time you build the softmodem or when some oai dependencies have changed.
- The `-I` option is to install pre-requisites, you only need it the first time you build the softmodem or when some oai dependencies have changed. Note: for Ubuntu 20 use cmake_targets/install_external_packages.ubuntu20 instead!
- The `-w` option is to select the radio head support you want to include in your build. Radio head support is provided via a shared library, which is called the "oai device" The build script creates a soft link from `liboai_device.so` to the true device which will be used at run-time (here the USRP one,`liboai_usrpdevif.so` . USRP is the only hardware tested today in the Continuous Integration process. The RF simulator[RF simulator](../targets/ARCH/rfsimulator/README.md) is implemented as a specific device replacing RF hardware, it can be specifically built using `-w SIMU` option, but is also built during any softmodem build.
-`--eNB` is to build the `lte-softmodem` executable and all required shared libraries
-`--gNB` is to build the `nr-softmodem` executable and all required shared libraries
#define CONFIG_HLP_IF_FREQ "IF frequency for RF, if needed"
#define CONFIG_HLP_IF_FREQ_OFF "UL IF frequency offset for RF, if needed"
#define CONFIG_HLP_DLSCH_PARA "number of threads for dlsch processing 0 for no parallelization\n"
#define CONFIG_HLP_OFFSET_DIV "Divisor for computing OFDM symbol offset in Rx chain (num samples in CP/<the value>). Default value is 8. To set the sample offset to 0, set this value ~ 10e6\n"
