What is the primary function of the Distributed Unit (DU) in a Cloud RAN architecture?

The primary function of the Distributed Unit (DU) in a Cloud RAN architecture is to process lower-layer protocols and connect with the Remote Radio Heads (RRHs). This role is crucial because the DU is situated between the centralized unit (CU) and the radio access components. By handling lower-layer processing, such as the physical (PHY) and medium access control (MAC) layers, the DU enables efficient radio signal processing and resource management. Its direct connection to the RRHs allows it to manage the transmission and reception of radio signals, facilitating effective communication with user devices while optimizing network performance.

This function is essential for the overall operation of the Cloud RAN, as it ensures that lower-layer functions are performed close to the radio hardware, supporting reduced latency and improved radio link performance. In this architecture, the DU's design allows flexibility, scalability, and distribution of network resources, crucial for meeting the demands of modern wireless communication.