TV Whitespace Spectrum Allocation via Centralized Database
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current spectrum allocation methods for wireless communications in TV whitespaces are inefficient, requiring frequent registration and limiting availability due to interference concerns, especially for mobile devices that move into new locations.
Innovation Solution
A wireless radio device and registration system that determine and select available channels for transmission and reception, allowing for increased bandwidth by using a central registration system to generate spectrum certificates that include both available and unavailable channels, enabling operational channels for both uplink and downlink communications while minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radio systems register every twenty-four hours and re-register when moving to new locations, then interference with incumbent systems is avoided, but spectrum utilization efficiency deteriorates due to frequent registration overhead
Solution Approach 1:
The system performs preliminary spectrum analysis and channel availability determination in advance, storing results for later use. Instead of re-registering every 24 hours or upon every location change, the radio system uses pre-determined channel maps and only updates when necessary, reducing registration overhead while maintaining interference avoidance
Solution Approach 2:
The system implements feedback mechanisms where radio systems report their operational status and location changes to the database, which then determines whether re-registration is necessary. This feedback loop allows the system to maintain reliability by monitoring actual conditions while avoiding unnecessary registration operations that reduce productivity
2Reliability
If channels are selected separately for transmission and reception, then interference with incumbent systems is minimized, but bandwidth efficiency deteriorates due to channel asymmetry
Solution Approach 1:
The system applies different channel selection criteria to transmission and reception operations based on local conditions. The database determines separate available channels for uplink and downlink by analyzing incumbent system locations and transmission patterns, allowing optimized channel assignment for each direction while maintaining overall bandwidth efficiency through intelligent resource allocation
3Adaptability or versatility
If TV whitespaces are made available for unlicensed use, then spectrum availability is improved, but reliability deteriorates due to potential interference with digital TV broadcasts and incumbent systems
Solution Approach 1:
A centralized database acts as an intermediary between unlicensed radio systems and incumbent TV broadcast systems. The database stores information about incumbent system locations and operational parameters, processes location and channel requests from radio systems, and determines safe channel assignments that avoid interference, thereby enabling spectrum availability while maintaining reliability
Solution Approach 2:
The system performs preliminary determination of available channels by analyzing incumbent system operations and geographic data before allocating spectrum to unlicensed radio systems. This advance planning ensures that spectrum availability is maximized while interference freedom is maintained through pre-validated channel assignments
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A wireless radio device includes a wireless transceiver configured to receive on a first channel set and transmit on a second channel set and a control circuit. The control circuit determines one or more available channels for transmission and selects one or more channels for the second channel set from the channels available for transmission. The control circuit also determines one or more available channels for reception, the one or more available channels for reception including the one or more available channels for transmission and one or more channels that are not available for transmission due to operation of an incumbent radio device in a location of the radio device; and selects one or more channels for the first channel set from the channels available for reception.