White Space Map Database for Channel Detection Accuracy
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Solution Overview
Problem
STA operating in TVWS relies solely on frequency sensing for available channel information, leading to increased operational load and potential errors like false alarms and missed detections, necessitating a more precise method for channel acquisition based on location information.
Innovation Solution
A method where an STA receives white space map information from a database, updates it with measurement results indicating the presence or absence of primary signals, and transmits this updated information to other stations, including details on the reliability of available channels based on database or measurement data, to efficiently manage channel usage and reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an STA uses only frequency sensing to obtain available channel information, then the STA can operate autonomously, but the operational load increases excessively and measurement accuracy decreases
Solution Approach 1:
A database server acts as an intermediary between STAs and the spectrum management system. The database stores pre-computed available channel information based on location data, and STAs query this pre-processed information rather than performing exhaustive frequency sensing themselves. This mediator approach reduces the operational load on STAs while maintaining autonomous operation through automated database queries and updates.
Solution Approach 2:
The database performs preliminary computation and storage of available channel information before STAs need it. By pre-processing spectrum analysis and storing results in the database, the system avoids requiring STAs to perform time-consuming frequency sensing operations in real-time, thus reducing their operational load while providing timely channel availability information.
2Device complexity
If an STA relies solely on frequency sensing, then no additional infrastructure is needed, but measurement precision decreases due to false alarms and missed detections
Solution Approach 1:
The system implements feedback mechanisms where STAs report their measurement results to the database, and the database uses this feedback information to update and refine its available channel information. This feedback loop allows the system to correct false alarms and missed detections by aggregating multiple STA reports, thereby improving measurement precision without significantly increasing device complexity.
Solution Approach 2:
The system merges frequency sensing results from multiple STAs with database information to create a more comprehensive and accurate picture of channel availability. By combining the perspectives of multiple distributed sensors (STAs) with centralized database records, the system achieves higher measurement precision through consensus and cross-validation of channel status information.
3Measurement precision
If an STA performs comprehensive spectrum sensing, then channel detection accuracy improves, but the time required for sensing increases and productivity decreases
Solution Approach 1:
The database server serves as an intermediary that provides pre-computed channel availability information to STAs, eliminating the need for STAs to perform time-consuming comprehensive spectrum sensing. The database queries return accurate channel status information directly, significantly reducing sensing time while maintaining high measurement precision through the database's pre-processed data.
Solution Approach 2:
Instead of performing original comprehensive spectrum sensing, STAs query copies of pre-computed channel availability information stored in the database. These database copies contain summarized spectral information and channel status data that replicate the results of comprehensive sensing without requiring STAs to perform the time-consuming measurement processes themselves.
Data Source
AI summary
The present invention relates to a method and apparatus, in which a station (STA) which operates in an available channel that is not used by a licensed device, detects a signal (hereinafter, referred to as ‘primary signal’) of the licensed device in a white space band, and operates in the available channel. According to the present description, the station receives white space map (WSM) information which contains available channel identification information from a device having database information; acquires the result of measurement for detecting the presence of the primary signal in a specific band range; and transmits, to another station, the WSM which is updated to contain information on the band in which the primary signal is detected, wherein the updated WSM further contains information which indicates whether each available channel in the updated WSM is based on the database information or based on the result of measurement.