Unified O-RAN Remote Units for Multi-Split DAS Fronthaul
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Solution Overview
Problem
Existing radio access networks face challenges in efficiently managing fronthaul bandwidth and interface compatibility with distributed antenna systems, particularly when using functional splits like Option 8, which require significant bandwidth and are limited to analog RF signals.
Innovation Solution
An open radio access network architecture utilizing a virtualized headend and unified remote units that support multiple functional splits, wireless interface protocols, and frequency bands, communicating over a switched Ethernet network to facilitate flexible and efficient data processing and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Option 8 functional split is used, then interface compatibility with distributed antenna systems is achieved, but fronthaul bandwidth requirements increase significantly
Solution Approach 1:
The patent segments the remote unit into multiple functional components: a legacy interface module that handles Option 8 analog RF interfaces with distributed antenna systems, and a digital processing module that processes fronthaul data using modern protocols. This segmentation allows the system to maintain compatibility with legacy DAS interfaces while reducing fronthaul bandwidth requirements through efficient digital processing and compression techniques.
Solution Approach 2:
The patent introduces a legacy interface module as an intermediary component that sits between the digital fronthaul network and the analog RF distributed antenna system. This intermediary translates and adapts signals between different protocols and formats, enabling compatibility with Option 8 interfaces while allowing the main system to operate with reduced bandwidth requirements using modern functional splits.
2Adaptability or versatility
If multiple functional splits and wireless interface protocols are supported, then adaptability improves, but device complexity increases
Solution Approach 1:
The patent implements a universal remote unit design that can operate with multiple functional splits (Option 6, Option 7, Option 8) and support multiple wireless interface protocols (4G LTE, 5G NR, Wi-Fi). The unit achieves this multi-functionality through configurable processing modules and a unified architecture that adapts to different protocol requirements without requiring separate dedicated hardware for each standard, thereby managing complexity while maintaining versatility.
Solution Approach 2:
The patent employs dynamic configuration capabilities that allow the remote unit to adapt its operational mode based on the specific functional split and wireless protocol being used. The system can dynamically reconfigure its processing pipelines, signal paths, and interface settings to match the required operational context, enabling support for multiple protocols and splits without requiring static complex hardware designs for each scenario.
Data Source
AI summary
One embodiment is directed to a system to provide wireless coverage for a plurality of cells. The system comprises a virtualized headend and a plurality of remote units. The system is configured to operate as a distributed antenna system (DAS) when serving at least one of the cells. The plurality of remote units is configured to communicate with the virtualized headend using a switched Ethernet network. The virtualized headend is configured to communicate downlink user-plane data for a first cell served by at least one open radio access network (O-RAN) distributed unit (DU) to one or more remote units used to serve the first cell. The system is configured to route the downlink user-plane data for processing based on respective evolved Common Public Radio Interface (eCPRI) or Institute of Electrical and Electronics Engineers (IEEE) 1914.3 headers included with the downlink user-plane data.