Control Channel Map Generation in Opportunistic Wireless Networks
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Solution Overview
Problem
In opportunistic wireless networks, existing systems face challenges in efficiently determining and detecting control channels due to the large and unpredictable nature of whitespace frequency bands, leading to prolonged scanning times for slave whitespace devices to connect with master devices.
Innovation Solution
A system and method where a master whitespace device uses a probability algorithm to create a control-channel map from a whitespace map received from a geo-location database, allowing for rapid determination and notification of control channels, enabling slave devices to quickly acquire the necessary channel information and establish connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If slave devices scan all whitespace frequency channels to find control channels, then detection completeness is improved, but scanning time increases
Solution Approach 1:
The patent segments the large whitespace frequency band into multiple smaller sub-bands. Slave devices scan these sub-bands sequentially or in parallel, finding control channels faster than scanning the entire band at once. This division reduces the time required while maintaining complete coverage through systematic scanning of all segments.
Solution Approach 2:
The patent implements preliminary action by having master devices broadcast their presence and control channel information in beacon frames before slave devices begin scanning. This allows slave devices to acquire control channel information more quickly by listening to these preliminary broadcasts rather than performing exhaustive scans from scratch.
2Adaptability or versatility
If the whitespace frequency band is large and unpredictable, then spectrum availability is improved, but connection establishment time increases
Solution Approach 1:
The patent implements dynamic adaptation where both master and slave devices can adjust their operating frequencies and control channels based on real-time spectrum conditions. The system dynamically selects available whitespace channels and updates control channel locations, allowing flexible adaptation to changing spectrum availability while maintaining efficient connections.
Solution Approach 2:
The patent uses feedback mechanisms where master devices transmit beacon frames containing control channel information and spectrum availability data. Slave devices receive this feedback and adjust their scanning and connection procedures accordingly, reducing establishment time by responding to real-time spectral conditions rather than performing fixed exhaustive scans.
3Measurement precision
If slave devices perform exhaustive spectrum scanning, then control channel detection accuracy is improved, but energy consumption increases
Solution Approach 1:
The patent segments the spectrum into sub-bands that slave devices scan in a structured manner. This segmentation allows devices to maintain detection accuracy by systematically covering all segments while reducing total scanning time and energy consumption compared to unsegmented exhaustive scanning of the entire whitespace band.
Solution Approach 2:
The patent implements periodic scanning of spectrum sub-bands rather than continuous exhaustive scanning. Slave devices periodically check control channels in segmented frequency ranges, maintaining adequate detection accuracy through regular sampling while significantly reducing energy consumption by avoiding constant full-band scanning.
Data Source
AI summary
An example apparatus for control channel determination and detection in an opportunistic wireless network environment is provided and includes a processor; and a memory in communication with the processor. The processor configured is to send, by a first device, a request for a whitespace map, the whitespace map including a list of whitespace frequency channels available for use within a particular geographical area. The processor is further configured to receive the whitespace map by the first device, and determine, by the first device, a control channel map from the whitespace map using a probability algorithm. The control channel map is a subset of the white space map and includes a list of control channel frequencies.