Cognitive Radio Coexistence via Secondary User Database
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Solution Overview
Problem
Cognitive radio systems face challenges in efficiently detecting and utilizing spectrum holes due to errors in determining primary user absence and lack of efficient coexistence methods between secondary users, leading to suboptimal spectrum use.
Innovation Solution
A method involving a coexistence node that receives and processes information on network properties from secondary cognitive radio users, forming and sending network maps to assist other users in selecting available channels, facilitating active coexistence and improved spectrum utilization through centralized or distributed database management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If passive coexistence methods are used where cognitive radio selects operation frequency based on sensing, then device complexity is reduced, but spectrum efficiency deteriorates due to inability to share sensing information
Solution Approach 1:
The patent introduces a secondary user database as an intermediary entity that collects, stores, and shares sensing information among multiple cognitive radios. This mediator enables active coexistence by allowing radios to query and contribute to a centralized database, improving spectrum efficiency without requiring complex peer-to-peer communication protocols between each radio device.
Solution Approach 2:
The patent merges individual sensing capabilities of multiple cognitive radios into a collective sensing database. By combining sensing results from multiple users into a centralized repository, the system achieves better spectrum efficiency through shared information while keeping individual radio devices relatively simple.
2Device complexity
If single detector is used for spectrum sensing, then device complexity is reduced, but measurement precision deteriorates due to errors in determining primary user absence
Solution Approach 1:
The patent combines sensing results from multiple detectors (either multiple physical detectors or multiple cognitive radios) into a unified decision through the secondary user database. This merging of detection outcomes improves measurement precision by cross-validating sensing results and reducing false positives regarding primary user absence.
Solution Approach 2:
The system implements feedback mechanisms where sensing results are uploaded to the database and can be queried by other users. This feedback loop allows detectors to refine their measurements by comparing against historical and peer sensing data, improving overall detection accuracy without adding complex local processing to each detector.
3Productivity
If active coexistence is implemented where cognitive radios share sensing information, then spectrum efficiency is improved, but device complexity increases due to information sharing infrastructure
Solution Approach 1:
The patent uses a secondary user database as a mediator to handle the complexity of information sharing. Individual cognitive radios only need simple upload and query functions to the database, avoiding the need for complex peer-to-peer communication infrastructure. The database absorbs the complexity of information management, enabling active coexistence with minimal added complexity at the radio level.
4Productivity
If spectrum sensing is performed to detect unused channels, then spectrum efficiency is improved, but loss of time increases due to difficult detection tasks
Solution Approach 1:
The patent implements preliminary action by having cognitive radios upload their sensing results to the secondary user database in advance. Other radios can then query this pre-collected information quickly without performing lengthy detection tasks themselves, reducing detection time while maintaining high spectrum utilization through access to comprehensive sensing data.
Solution Approach 2:
The system merges sensing efforts across multiple users and consolidates results in a centralized database. This combination allows any individual radio to quickly access aggregated sensing information from the network, reducing the time each device needs to spend on detection while improving overall spectrum utilization through collective intelligence.
Data Source
AI summary
In a non-limiting and exemplary embodiment, a method is provided for sharing secondary cognitive radio resource user related information. A coexistence node receives information on network properties associated with secondary cognitive radio resource users. An upload message is generated and sent, the upload message comprising for a secondary user database at least information on the received network properties associated with secondary cognitive radio resource users. A location-dependent network map comprising at least information on network properties is generated. The network map is sent to assist one or more secondary cognitive radio resource users.