LimeSuite provides the drives and utilities for interfacing with the LimeSDR. Software Installįor this tutorial series I’ll be using Ubuntu 18.04 and trying where possible to use packages from Repos instead of compiling from source. This is a much cleaner way of interfacing with the boards and the path I’ll be taking. Osmocom now provide a binary for interfacing with LimeSDR boards directly, instead of having to use the UHD abstraction. My ever growing collection of SDR hardware now includes a LimeSDR which I’ll be using for this series.īefore we can get too far we’ve got to setup the prerequisites for the LimeSDR to be able to interface with Osmo-TRX. Osmo-bts-trx will then setup an Abis over IP connection to our BSC. Osmo-trx-lms will take care of the SDR side of the equation, pretty much serving as a modem and sending everything it gets on the Uu interface to osmo-bts-trx over UDP, and everything it receives from osmo-bts-trx over UDP it sends out the Uu interface. The above diagram from the Osmocom wiki shows how this fits together with generic SDR platforms, here’s how it fits together for us:

In order to bring in a large array of SDR hardware, Osmocom have introduced Osmo-TRX, which handles the Layer 1 physical layer of the BTS, and connects to Osmo-BTS which serves as the BTS and talks Abis over IP to the MSC.Ĭertain hardware can talk directly to Osmo-BTS, but we’re going to rely on Osmo-TRX to act as the middleman between our SDR hardware and the BTS. If you’re not using SDR hardware you can just skip ahead to the next post on BSCs.īut, if you’re in the same boat as me, without any commercial BTS / RAN hardware, we’ll be setting it up by using an SDR platforms (In my case LimeSDR) and that’s what this tutorial will focus on. The below post will touch on using common SDR hardware to act as our BTS. If you’re using any of these premade BTS hardware options, or osmo-bts-virtual, you probably just need to setup the basics on your BTS and point it to your BSC, end of story. There’s a list of supported BTS hardware that can talk out of the box to the Osmo-BSC, such as the Ericsson RBS series, ip.access nanoBTS, Nokia and Siemens units and even a virtual BTS so you can simulate the connections. Osmo-BSC accepts Abis over IP connections from a number of different sources,

Trx installation requirements