Hybrid RU Functional Splits for Cellular CoMP Processing
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Solution Overview
Problem
The Virtual-RAN architecture in 5G networks faces challenges in balancing compute power and spectral efficiency, particularly in split option 6, where PHY processing is done in the RU, leading to limitations in supporting advanced features like uplink CoMP, especially in dense deployments.
Innovation Solution
A hybrid split option approach is introduced, combining split option 6 for single-cell users and split option 7.x for multi-cell joint processing, utilizing a hybrid RU that can dynamically switch between these options based on user needs and resource availability, with a PHY manager to distribute data paths and control data accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If split option 6 is used where PHY processing is done in the RU, then device complexity at the RU is reduced, but spectral efficiency and support for advanced features like CoMP deteriorate
Solution Approach 1:
The system dynamically switches between split option 6 and split option 7.x based on service requirements, user equipment capabilities, and network conditions. The PHY manager enables flexible transition between processing modes, allowing the RU to operate in a simpler mode when advanced features are not needed while supporting full joint processing when CoMP or other advanced features are required.
2Reliability
If split option 7.x is used for multi-cell joint processing, then spectral efficiency and support for advanced features are improved, but compute power requirements increase
Solution Approach 1:
The patent segments the PHY processing functions between the RU and DU/CU based on the specific service requirement. For single-cell services, processing is segmented to keep more functions at the RU. For multi-cell CoMP services, additional processing functions are segmented to the DU/CU to enable joint processing while distributing the compute burden appropriately across the network.
3Adaptability or versatility
If hybrid split option is implemented to support both single-cell and multi-cell scenarios, then adaptability is improved, but system complexity increases
Solution Approach 1:
The RU is designed with universal capabilities to support both split option 6 and split option 7.x operations. The PHY manager implements a unified control mechanism that handles both single-cell and multi-cell scenarios through a common architecture, reducing the need for separate specialized components and simplifying the overall system design despite the multi-functional requirements.
Data Source
AI summary
A method and computer readable media are described for providing hybrid functional splits for a system. In one example embodiment a method includes defining, for a system having a Radio Unit (RU) and a Distributed Unit (DU) a Centralized Unit (CU) and an interface protocol between the RU to the DU and to the CU, a plurality of split options for balancing computer power and spectral efficiency, the plurality of split options including a split option 6 in which users are served by a single cell; and a split option 7.x in which users are served by multi-cell joint processing.