(Telecompaper) SK Telecom has implemented what it says is the world's first Software-Defined RAN, also known as a cloud RAN, on a commercial network. The project was conducted with Nokia. SDRAN enables traditional base station functions to be implemented on a general-purpose IT server and run as a virtual machine. The architecture of the SDRAN includes a functional split of the protocol in the baseband processing. This relegates parts of the DU (Digital Unit) functions to the RRU (Remote Radio Unit), allowing traffic to be scaled more effectively and multiple connectivity scenarios deployed efficiently without immediate additional investments in transport or baseband capacity.