FDM Band-Specific Power Control for Inter-Cell Interference
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Solution Overview
Problem
Conventional cell control mechanisms in wireless communication networks fail to optimally manage frequency-selective interference between cellular sites, leading to suboptimal spectral efficiency due to the lack of frequency division multiplexing (FDM) band-specific direct information exchange between NodeBs.
Innovation Solution
Implementing FDM band-specific information exchange between NodeBs to enable advanced scheduling decisions and power adjustments, allowing for predictive interference management by monitoring and adjusting transmit power and modulation based on interference levels across different frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional cell control mechanisms are used without FDM band-specific information exchange, then device complexity is reduced, but spectral efficiency deteriorates due to inability to manage frequency-selective interference
Solution Approach 1:
The patent segments the frequency spectrum into multiple FDM bands and implements separate power control and scheduling for each band. NodeBs exchange band-specific interference information and apply band-specific power adjustments, transforming a single-channel control problem into multiple independent sub-problems that can be solved more effectively
Solution Approach 2:
The patent implements predictive interference management by having NodeBs monitor and exchange interference information in advance before actual interference occurs. This allows NodeBs to pre-adjust power levels and make scheduling decisions proactively, preventing interference issues rather than reacting to them after they occur
2Object-affected harmful factors
If FDM band-specific power control is implemented, then inter-cell interference is reduced, but information exchange requirements between NodeBs increase
Solution Approach 1:
The patent applies local quality by implementing power control parameters and interference management specific to each FDM band and each cell's local conditions. Each NodeB adjusts power levels based on its own interference measurements and local scheduling needs, rather than applying uniform control across all frequencies
Solution Approach 2:
The patent establishes feedback loops where NodeBs continuously monitor interference levels on each FDM band, exchange this information with neighboring NodeBs, and adjust power control parameters accordingly. This closed-loop system enables dynamic adaptation to changing interference conditions while maintaining coordinated control across the network
3Productivity
If advanced scheduling decisions are made based on band-specific information, then resource allocation is optimized, but processing complexity at NodeB increases
Solution Approach 1:
The patent divides the scheduling problem into separate band-specific sub-problems, allowing NodeBs to make scheduling decisions for each FDM band independently. This segmentation reduces the overall complexity by breaking down a large optimization problem into smaller, more manageable pieces that can be processed in parallel
Data Source
AI summary
A method is described for operating a cellular network, where the cellular network uses a plurality of frequency division multiplexing (FDM) bands for wireless communication from user equipment (UE) to a base station (NodeB). At least one band-specific cell parameter is computed for at least one the plurality of FDM bands by a serving NodeB. The band-specific cell parameters are transmitted from the NodeB serving a first cell to a NodeB serving a second cell. The band-specific cell parameters may be computed in response to scheduling information and/or channel specific measurements made by the NodeB. A UE receives a first Power Configuration, a Second Power Configuration, and a Scheduling Message indicative of an FDM band from the set comprising at least from First FDM band and Second FDM band. The UE transmits with the First Power Configuration if the Scheduling Message was indicative of First FDM band, and with the Second Power Configuration otherwise.