DSL Power Allocation via Geographic Spectral Masking
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Solution Overview
Problem
Existing methods for allocating power levels in DSL networks are inefficient as they reduce power levels across all frequencies, regardless of whether they interfere with RF services, leading to underutilization of spectrum and potential interference with other radio frequency services.
Innovation Solution
A method to create a tailored transmit spectral mask by identifying and combining notching masks for increasingly localized geographic regions, reducing power levels only for frequencies that may interfere with RF services, thereby optimizing spectrum usage without causing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single transmit spectral mask is applied to all connections of a particular form, then device complexity is reduced and ease of operation is improved, but spectrum utilization is reduced and bandwidth is limited
Solution Approach 1:
The patent segments the spectrum allocation by creating separate spectral masks for different geographic regions. Each region has its own spectral mask that is tailored to the specific RF services operating in that area, allowing optimized spectrum utilization for each region while maintaining manageable complexity through automated mask generation and selection
Solution Approach 2:
The patent implements dynamic spectral mask selection based on geographic location and RF environment. The system automatically determines the appropriate spectral mask for each connection based on the customer premises location and applicable RF services, allowing the spectral allocation to adapt dynamically to different geographic conditions rather than using a static universal mask
2Object-generated harmful factors
If power levels are reduced across all frequencies to prevent RF interference, then harmful factors are reduced, but useful energy is lost and bandwidth is reduced
Solution Approach 1:
The patent applies local quality by creating spectrally selective masks tailored to each geographic region's specific RF environment. Instead of uniformly reducing power across all frequencies, the system identifies exactly which frequency bands cause interference in each region and applies targeted power reductions only to those specific bands, leaving other frequencies at full power for useful data transmission
Solution Approach 2:
The patent converts the harmful effect of RF interference into beneficial spectrum optimization by using the knowledge of RF service locations to intelligently allocate spectrum. Rather than simply reducing power to avoid interference, the system uses RF environment information to identify safe frequency bands for high-power transmission, effectively turning interference constraints into opportunities for optimized spectrum utilization
3Productivity
If spectral masks are customized for each individual subscriber line, then spectrum utilization is improved and bandwidth is increased, but device complexity and computational requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-generating spectral masks for different geographic regions based on known RF service locations and characteristics. These pre-computed masks are stored and automatically selected based on the customer premises location, eliminating the need for complex real-time calculations while still providing customized spectrum allocation for each region
Solution Approach 2:
The patent introduces an intermediary layer (the geographic region-based mask selection mechanism) that bridges the gap between individual line customization and system-wide simplicity. The system maps customer premises locations to geographic regions, which then map to pre-determined spectral masks, providing customized allocation without requiring complex per-line analysis
Data Source
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AI summary
The invention relates to a method, and a device for performing said method, for allocating power levels to a transmission in a DSL network, the method comprising the steps of: identifying a first and second geographical region as being associated with a subscriber line in the DSL network; defining a first spectral mask having a first set of power levels over a range of frequencies, wherein the first set of power levels are tailored according to a Radio Frequency, RF, environment of the first geographical region; defining a second spectral mask having a second set of power levels over the range of frequencies, wherein the second set of power levels are tailored according to an RF environment of the second geographical region; and constructing a transmit spectral mask for the subscriber line, the transmit spectral mask based on a combination of the first and second spectral masks, including, for each frequency in the range of frequencies, using the minimum power level for that frequency from the first and second spectral masks.