Cognitive Radio Sensing Reference Level Adaptation
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Solution Overview
Problem
Current cognitive radio systems face inefficiencies in resource utilization due to unnecessary fine sensing operations, leading to interference with primary communication apparatuses and wastage of wireless resources, as they struggle to accurately determine the presence of primary signals during fast and fine sensing periods.
Innovation Solution
A cognitive radio communication apparatus and method that adaptively controls the sensing reference level based on the transmission power of a secondary transmitter, reducing the probability of false alarms and missed detections by optimizing the sensing reference level to efficiently perform fast sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a fixed sensing reference level is used in fast sensing, then the sensing operation is simple and quick, but the accuracy of signal detection is poor leading to false alarms or missed detections
Solution Approach 1:
The sensing reference level is changed from a fixed value to a dynamically adjustable parameter. The controller adapts the sensing reference level based on the transmission power of the secondary transmitter, allowing the system to maintain high detection accuracy while performing fast sensing operations. This dynamic adjustment resolves the contradiction by making the reference level responsive to changing transmission conditions.
Solution Approach 2:
The patent changes the sensing reference level parameter according to the transmission power of the secondary transmitter. When transmission power varies, the sensing reference level is accordingly adjusted to maintain optimal detection accuracy. This parameter change approach allows the fast sensing operation to remain both quick and accurate by adapting the reference level to current transmission conditions.
2Measurement precision
If secondary communication apparatus performs fine sensing to verify signal presence, then detection accuracy improves, but wireless resources are wasted due to unnecessary fine sensing operations
Solution Approach 1:
The sensing reference level is pre-adjusted based on the transmission power of the secondary transmitter before the fast sensing operation. This preliminary adjustment ensures that the fast sensing can accurately determine signal presence without requiring subsequent fine sensing verification. By preparing the correct reference level in advance, the system avoids unnecessary fine sensing operations and conserves wireless resources.
Solution Approach 2:
The system uses feedback from the transmission power information to continuously adjust the sensing reference level. This feedback mechanism ensures that the sensing reference level remains optimized for current conditions, improving fast sensing accuracy and reducing the need for resource-intensive fine sensing operations to verify detection results.
3Ease of operation
If secondary communication apparatus uses a predetermined fixed sensing reference level, then the system operation is simple, but interference with primary communication apparatus cannot be effectively prevented
Solution Approach 1:
The sensing reference level transitions from a static predetermined value to a dynamic parameter that automatically adjusts based on transmission power conditions. This dynamic behavior maintains operational simplicity for the secondary apparatus while significantly improving reliability in preventing interference with primary communication apparatus through adaptive reference level selection.
Solution Approach 2:
The sensing reference level adjustment is performed automatically by the controller based on transmission power information, without requiring manual intervention or complex configuration. The system serves itself by autonomously adapting the reference level to current conditions, maintaining ease of operation while enhancing interference prevention reliability.
Data Source
AI summary
A cognitive radio communication apparatus and method which adaptably controls a sensing reference level based on a transmission power of a transmitter is provided. A cognitive radio communication apparatus includes a sensing reference level control unit to adaptably control a sensing reference level based on a transmission power of a secondary transmitter included in a secondary network, and a fast sensing unit to determine whether a signal received for a predetermined time period exists based on the controlled sensing reference level.