Dynamic Cell Bonding for RoF Network Link Loss Equalization
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Solution Overview
Problem
Multi-mode optical fibers (MMFs) used in wireless communication systems exhibit varying bandwidth distributions, leading to unpredictable link loss and operational challenges, particularly in picocellular networks, where the variability in bandwidth response causes deleterious effects on signal strength and data transmission.
Innovation Solution
Dynamic cell bonding (DCB) is employed in Radio-over-Fiber (RoF)-based networks, where a controller determines the signal strength and data rate of remote units, dynamically bonding underutilized units to communication sessions to equalize link loss and improve bit rates, thereby compensating for bandwidth limitations and mitigating fading effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multi-mode optical fibers (MMFs) are used in picocellular networks, then coverage area and network deployment are improved, but bandwidth response variability causes unpredictable link loss and signal strength degradation
Solution Approach 1:
The patent implements dynamic cell bonding that allows remote units to be dynamically added or removed from picocells based on real-time signal strength measurements and user equipment associations. This dynamic reconfiguration compensates for MMF bandwidth variability by adapting the network topology to current conditions, thereby maintaining reliable link loss characteristics while preserving coverage area expansion benefits.
Solution Approach 2:
The system changes operational parameters by measuring signal strength and data rate metrics for each remote unit, then uses these parameter measurements to determine which remote units to bond to which picocells. This parameter-based dynamic bonding approach equalizes link loss across the network despite MMF bandwidth response variations.
2Device complexity
If remote units are statically assigned to picocells, then network configuration is simplified, but bandwidth limitations of MMFs cause inconsistent data transmission performance
Solution Approach 1:
The patent transitions from static to dynamic remote unit assignment by continuously measuring signal strength and data rate parameters. The controller dynamically bonds remote units to picocells based on current performance metrics, which equalizes data transmission consistency across the network while managing complexity through automated measurement and bonding decisions.
Solution Approach 2:
The system implements feedback mechanisms by measuring signal strength and data rate for each remote unit, then using this feedback information to make bonding decisions. This closed-loop approach ensures that remote units are assigned to picocells in a way that compensates for MMF bandwidth limitations and maintains consistent data transmission performance.
3Reliability
If higher bandwidth MMFs are used, then link loss variability is reduced, but system cost and manufacturing complexity increase
Solution Approach 1:
The patent enables the use of lower-cost MMFs with shorter lengths by implementing dynamic cell bonding that compensates for their bandwidth limitations. Instead of requiring expensive high-bandwidth MMFs, the system uses multiple shorter, cheaper fiber segments with remote units positioned along them, and dynamically bonds these units to picocells to achieve the required performance at lower cost.
Solution Approach 2:
The system segments the optical fiber infrastructure into multiple shorter MMF links with remote units distributed along them, rather than using single long high-bandwidth fibers. This segmentation allows the use of lower-cost MMFs while maintaining overall network performance through dynamic bonding of the segmented units to appropriate picocells.
4Area of stationary object
If multiple remote units are bonded to a picocell, then coverage area is extended, but managing and coordinating these units increases system complexity
Solution Approach 1:
The controller uses feedback from signal strength and data rate measurements to automatically manage multiple bonded remote units. This feedback-driven approach simplifies the management of extended coverage areas by making bonding decisions based on objective metrics rather than manual configuration, thereby handling multiple remote units systematically even as coverage area expands.
Solution Approach 2:
The system manages multiple bonded remote units by continuously monitoring and responding to changes in signal strength and data rate parameters. This parameter-based management approach allows the system to dynamically adjust bonding configurations to maintain optimal performance across extended coverage areas without proportionally increasing management complexity.
Data Source
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AI summary
Communication devices, systems, and methods for dynamic cell bonding (DCB) for Radio-over-Fiber (RoF)-based networks and communication systems are disclosed. In one embodiment, a method of operating an optical fiber-based wireless communication system is provided. The method includes determining a first plurality of remote units in a cloud bonded to a Radio-over-Fiber (RoF) communication session. The method also includes measuring a received signal strength from each of the first plurality of remote units. The method also includes measuring a received signal strength from each of a second plurality of remote units in the cloud not bonded to the RoF communication session. At least one of the second plurality of remote units is dynamically bonded to the RoF communication session if the measured received signal strength of the one of the second plurality of remote units is greater than the measured received signal strength of the first plurality of remote units.