Dynamic Transmit Power Control for Coexisting Wireless Systems
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Solution Overview
Problem
The challenge lies in managing inter-system interference between geographically co-existing radio systems that share the same frequency range, particularly when a broadband radio system and a narrowband radio system overlap, as traditional methods fail to maintain acceptable interference levels without degrading the performance of either system.
Innovation Solution
A method where network nodes of both radio systems coordinate by exchanging carrier application status information to dynamically control uplink transmit power, ensuring efficient interference management and maintaining system performance by adjusting power levels based on the activity status of overlapping frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high transmit power is used in a radio system, then signal quality and data rate are improved, but interference to co-existing systems increases
Solution Approach 1:
The patent implements dynamic transmit power control where the broadband system adjusts its uplink power levels in real-time based on the activity status of narrowband carriers. The network node determines carrier application status and sends control information to user equipment, which then adapts transmit power dynamically - using higher power when narrowband carriers are inactive and reducing power when they are active, thus resolving the contradiction between maintaining signal quality and reducing interference.
Solution Approach 2:
The system establishes a feedback loop where the network node continuously monitors carrier application status of narrowband systems and sends control information back to user equipment. This feedback mechanism enables the broadband system to adjust its transmit power based on real-time conditions of the co-existing narrowband system, allowing the system to maintain high signal quality when interference is not an issue while reducing power when interference would harm the narrowband system.
2Object-generated harmful factors
If traditional interference control methods are applied to co-existing broadband and narrowband systems, then interference levels are reduced, but performance of both systems deteriorates
Solution Approach 1:
The patent applies local quality by implementing selective and differential power control across different frequency resources. Instead of uniformly suppressing broadband uplink power across the entire frequency band, the system adjusts power only in specific resource blocks or subcarriers that overlap with active narrowband carriers. This localized approach maintains high performance in broadband regions where narrowband systems are inactive while providing targeted interference reduction only where needed.
Solution Approach 2:
The broadband frequency band is segmented into multiple resource blocks or subcarriers, and power control is applied independently to each segment based on its overlap with narrowband carriers. This segmentation allows the system to maintain high transmit power in segments free from narrowband interference while reducing power only in segments that would cause harmful interference, thereby preserving overall system performance while controlling interference.
3Object-generated harmful factors
If guard bands are used to separate frequency ranges of co-existing radio systems, then inter-system interference is reduced, but available frequency spectrum decreases
Solution Approach 1:
The patent replaces static guard bands with dynamic frequency sharing mechanisms. Instead of permanently allocating frequency resources as guard bands to prevent interference, the system dynamically allows broadband and narrowband systems to share the same frequency spectrum in real-time based on their respective activity status. When narrowband carriers are inactive, broadband systems can utilize those frequencies without interference, effectively eliminating the need for permanent guard bands and maximizing spectrum utilization.
Data Source
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AI summary
. A telecommunications system that comprises a first radio system transceiving in all or part of a first frequency range, a second radio system managing all or part of a second frequency range. The first frequency range and the second frequency range overlap at least partly, and the overlapping parts form an intersected frequency zone. A network node (116) of the first radio system sends information on carrier application status of carrier in the intersected frequency range to a network node (120) of the second radio system that uses the information to control transmissions in one or more carrier frequency bands of the intersected frequency range.