FluidNet Reconfigurable Backhaul for Small Cell RAN
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Solution Overview
Problem
Current cloud-based radio access networks (C-RAN) for small cells have a sub-optimal one-to-one mapping of baseband units (BBUs) to radio access units (RAUs), which limits flexibility and efficiency in catering to heterogeneous user profiles and traffic loads, leading to sub-optimal performance and energy consumption.
Innovation Solution
The implementation of a reconfigurable backhaul architecture, named FluidNet, which allows for dynamic and flexible mapping between BBUs and RAUs, enabling both one-to-one and one-to-many logical connections using radio-over-fiber technology, thereby adapting to varying user profiles and traffic conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a one-to-one mapping of BBUs to RAUs is used in C-RAN, then the system structure is simple and easy to manage, but the flexibility and efficiency in catering to heterogeneous user profiles and traffic loads is limited
Solution Approach 1:
The patent implements a dynamic mapping mechanism where the backhaul architecture can reconfigure the mapping between BBUs and RAUs based on real-time traffic conditions and user profiles. The system transitions from a static one-to-one mapping to a dynamic many-to-many mapping, allowing BBUs to be flexibly assigned to multiple RAUs and vice versa, thereby improving adaptability without permanent structural complexity
Solution Approach 2:
The patent creates a universal BBU pool where each BBU can serve multiple RAUs simultaneously through virtualization and software-defined networking. This multi-functional approach allows a single BBU to handle traffic from multiple RAUs, catering to heterogeneous user profiles and traffic loads, thus improving versatility while managing complexity through software abstraction
2Use of energy by stationary object
If a fixed one-to-one mapping is maintained, then the system is easier to manage, but energy consumption in the BBU pool increases due to inability to optimize resource usage
Solution Approach 1:
The patent merges multiple RAUs under a single BBU's management through the reconfigurable backhaul, consolidating processing resources. This allows the system to reduce the number of active BBUs during low-traffic periods or when traffic patterns allow consolidation, thereby reducing energy consumption in the BBU pool while maintaining service quality
Solution Approach 2:
The patent dynamically changes the mapping parameters between BBUs and RAUs based on traffic load, user mobility, and service requirements. By adjusting these mapping parameters in real-time, the system optimizes BBU utilization and reduces energy consumption without requiring complex manual management interventions
3Productivity
If reconfigurable backhaul is implemented to allow flexible mapping, then RAN performance is optimized for heterogeneous users, but the backhaul architecture becomes more complex
Solution Approach 1:
The patent implements feedback mechanisms where the system continuously monitors traffic conditions, user mobility, and network performance, then uses this feedback to dynamically reconfigure the BBU-RAU mapping. This closed-loop control optimizes RAN performance by adapting to changing conditions while automating the reconfiguration process to manage complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
FluidNet enhances RAN performance by effectively supporting both static and mobile users and reduces energy consumption in the BBU pool by optimizing resource usage and enabling hybrid configurations that balance traffic demand and resource utilization.
Implementation Method 1
allows 4 BBUs to connect flexibly with 4 RAUs using radio-over-fiber technology
Data Source
AI summary
A wireless communications system is disclosed. The system comprises a baseband processing unit (BBU) pool including one or more baseband processing units (BBUs), and a plurality of remote radio heads (RRHs) connected to the BBU pool through a front-haul network, wherein the wireless communications system has a plurality of sectors, each of which includes one or more small cells, each of which is deployed by one of the plurality of RRHs, wherein a BBUs is mapped to two or more RRHs in a sector in a one-to-many configuration, and a BBU is mapped to a single RRH in a sector in a one-to-one configuration, and wherein a combination of the one-to-one configuration and the one-to-many configuration is applied to each sector. Other systems, apparatuses, and methods also are disclosed.