*`git clone https://YOUR_USERNAME@gitlab.eurecom.fr/oai/xtables-addons-oai.git` (optional, openair-cn build script can do it for you)
## Which branch to checkout?
On the RAN side:
***master**: This branch is targeted for the user community. Since January 2019, it is also subject to a Continuous Integration process. The update frequency is about once every 2-3 months. We are also performing bug fixes on this branch.
***develop**: This branch contains recent commits that are tested on our CI test bench. The update frequency is about once a week.
After you have [built the softmodem executables](BUILD.md) you can go to the build directory `cmake_targets/lte_build_oai/build/` and start testing some use cases.
## rf simulator
This is the easiest use-case to setup and test, you need two x86 PCs, 4 cores and 3GHz CPU should be enough