GSM-Basestation

Previously covered on this RTL-SDR Post. Quickly create a GSM network that can support calls and sms.

Requirements

Software

DragonOS UHD OpenBTS ### Hardware Computer or RaspberryPi running DragonOS Software Defined Radio (one required) Compatible Phone compatible SDR

Watch on Youtube

Set Up Base Station Calling

Plug in SDR
1. Connect SDR to Computer
2. Perform Radio Checks

lsusb
ifconfig

Configure Network Connection IPV4
1. Create a new interface netmask for the interface graphically or via CLI example:
```
Interface#
IPV4
192.168.1.20/24
```
confirm using uhd_find_devices. It should have an additional search for the installed device

uhd_find_devices

Update Config. Set Call to True

cd /usr/src/osmo-nitb-scripts
sudo nano config.json #
sudo main_uhd.py -u --sip
= u for Interact =
= --sip for astric support

=

In another terminal

/usr/bin/osmo-trx-uhd -C /etc/osmocom/osmo-trx-uhd.cfg

Set Up Base Station OpenBTS

Plug in SDR
1. Plugin
2. Confirm the Interface name
```
lsusb
ifconfig
```
Configure Network Connection IPV4
1. Create a new interface netmask for the interface graphically or via CLI example:
```
Interface#
IPV4
192.168.1.20/24
```
Move the Directory to OpenBTS

cd /usr/src/OpenBTS/

Register SIM

sudo /usr/src/OpenBTS/OpenBTS
= Connection should be very quick

=

Details

Compatible Phones

For this to work, the mobile device needs to have a Calypso baseband chip Motorola: - C115 $40or C117 (E87) - C123/C121/C118 (E88)
- C140 $27 or C139 $15 (E86)
- C155 (E99)
- V171 (E68/E69)
SonyEricsson - J100i $8.99 #### Compatible SDR See the software-defined-radio comparison cross table. For this to work, the SDR must be Full duplex, cover the correct frequency range (850 MHz and 1900 MHz), and work with the software:

YateBTS works with:

BladeRF $540+ ##### srsRan supports: BladeRF $540+ LimeSDR ##### Osmo-nitb works with: LimeSDR AntSDR E200 ##### OpenBTS works with: LimeSDR maybe BladeRF $540+