A New Path Model for DU/CU Placement in 5G Open Radio Access Network

Paper in proceeding, 2025

The advent of fifth-generation (5G) mobile networks, built on virtualized and centralized radio access network architectures, demands innovative and adaptable solutions to fulfill stringent requirements for high data rates and ultra-low latency. This highlights the critical need for advancements in the next-generation fronthaul interface design. Within this framework, or Open Radio Access Networks (Open-RAN), baseband processing tasks are distributed among radio units (RUs), distributed units (DUs), and central units (CUs). In the context of optical technology, Open RAN specifically utilizes optical fiber in the fronthaul segment to effectively transmit baseband signals and control data between the DU and the RU. This paper introduces an innovative Integer Linear Programming (ILP) path model aimed at optimizing the latency-sensitive placement of DU and CU functions within Open RAN architecture. The path model employs predefined routing paths to minimize computational overhead while adhering to the tight latency requirements essential for 5G applications.