Function Split Structure for Mobile Optical Fronthaul

The patent applies segmentation by dividing the base station into multiple functional units (CU, DU, AU, RU) with different processing capabilities. The AU (aggregated unit) is introduced as a new segment that handles PHY upper layer functions, separating critical functions from the RU and enabling flexible deployment configurations that reduce overall system complexity while maintaining high transmission capacity.

The patent implements dynamics through flexible function allocation where the AU can be configured with different processing capabilities depending on deployment scenarios. The system allows dynamic adjustment of function distribution between units, enabling optimization of transmission capacity while adapting to varying implementation complexity requirements in different network environments.

The patent segments the base station functions across multiple units (CU, DU, AU, RU) with the AU specifically handling PHY upper layer functions. This segmentation enables the fronthaul to carry only essential data rather than all processing functions, significantly reducing required bandwidth while the modular architecture manages the resulting system complexity through standardized interfaces and clear functional boundaries.

The AU serves as an intermediary unit between the RU and higher-layer units, mediating the function split by handling PHY upper layer processing locally. This intermediary structure reduces fronthaul bandwidth requirements by preventing unnecessary data from traveling across the network, while its standardized interface design helps manage the complexity introduction through predictable integration points.

The patent applies universality by designing the AU with multi-functional capabilities that can perform CoMP (coordinated multi-point) processing, channel state information collection from multiple RUs, and precoding operations. This universal design consolidates CoMP functionality into a single unit type rather than requiring complex distributed implementations, improving user throughput while managing complexity through functional consolidation.

The patent uses copying by having multiple RUs (radio units) that can be instantiated at different locations, each capable of collecting channel state information. The AU then processes information from these copies to enable CoMP technology, improving throughput for cell boundary users while managing complexity through standardized copying of functional blocks rather than custom implementations at each site.