Hybrid Functional Split for Multi-Cell Joint Processing in vRAN
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Solution Overview
Problem
The Virtual-RAN architecture 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 proposed, combining split option 6 for single-cell user service and split option 7.x for multi-cell joint processing, utilizing a hybrid RU with PHY processing capabilities and a DU/CU interface protocol to dynamically allocate processing resources based on user needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If split option 6 is used where PHY processing is done in the RU, then device complexity at RU is reduced and ease of operation is improved, but spectral efficiency and support for advanced features like uplink COMP are limited
Solution Approach 1:
The patent segments the PHY processing function into two distinct modes: local PHY processing at the RU for basic operations, and centralized joint processing at the DU/CU for advanced features. This segmentation allows the system to achieve both ease of operation (through simple local processing) and high spectral efficiency (through centralized joint processing) by selecting the appropriate mode based on deployment needs and feature requirements.
2Productivity
If split option 7.x is used for multi-cell joint processing, then spectral efficiency is improved, but compute complexity at DU/CU increases
Solution Approach 1:
The patent implements a dynamic functional split mechanism where the system can adaptively switch between split option 6 (local PHY processing) and split option 7.x (centralized joint processing) based on real-time network conditions, user requirements, and feature needs. This dynamic adjustment allows the system to optimize the balance between spectral efficiency and compute complexity by deploying joint processing only when and where it is most beneficial.
3Adaptability or versatility
If hybrid split option is implemented to support both single-cell and multi-cell processing, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent creates a universal RU design that can operate in multiple modes: standalone local PHY processing mode for basic communications, and collaborative joint processing mode for advanced features. The RU includes both local processing capabilities and interfaces to the DU/CU, making it a multi-functional unit that can adapt to different deployment scenarios. This universality achieves high adaptability while managing complexity by building upon a common processing foundation.
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.