Dynamic Spectrum Sensing Triggered by Channel Quality
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Solution Overview
Problem
Current spectrum sensing technologies face challenges in balancing sensing period duration, leading to interference with authorized systems, network breakdowns, or increased power consumption and resource wastage, due to either prolonged or shortened sensing periods.
Innovation Solution
A method and system where a central node receives channel quality conditions from cognitive nodes, attributes them to sets, and triggers in-band spectrum sensing only when the channel quality declines to a specific requirement, determined by interference, received power, feedback, synchronization status, or CRC information, without setting a fixed sensing period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensing period is set too long, then the cognitive system can detect authorized system operations, but the quality of service of the authorized system and cognitive system degrades and network breakdown occurs due to interference
Solution Approach 1:
The patent implements dynamic sensing period adjustment where the sensing period is not fixed but adapts based on channel quality conditions. The network device receives channel quality information from terminal devices, determines whether channel quality has declined to a threshold, and dynamically adjusts the sensing period accordingly. This dynamic approach allows the system to extend sensing periods when channel quality is good (reducing interference) while maintaining detection reliability when quality declines.
Solution Approach 2:
The patent changes the parameter of sensing period duration based on channel quality conditions. Instead of using a static sensing period, the system monitors channel quality metrics (such as signal-to-interference-plus-noise ratio, bit error rate) and adjusts the sensing period parameter dynamically. When channel quality is above a threshold, the sensing period is extended; when quality declines, the sensing period is reduced or sensing is triggered immediately, thus balancing detection reliability with interference minimization.
2Object-affected harmful factors
If the sensing period is set too short, then interference with authorized systems is reduced, but power consumption increases and spectrum resources are wasted
Solution Approach 1:
The system dynamically adjusts the sensing period based on actual channel quality conditions rather than using a fixed short period. When channel quality is stable and good, the sensing period is extended, which reduces the frequency of sensing operations and thereby reduces power consumption. When channel quality declines, the system triggers sensing operations more frequently or immediately, ensuring detection reliability while minimizing unnecessary sensing during good conditions.
Solution Approach 2:
The system uses channel quality information reported by terminal devices to automatically determine whether sensing is needed, eliminating the need for continuous periodic sensing. The terminal devices self-monitor channel quality and report to the network device, which then decides whether to trigger sensing operations. This self-service mechanism reduces overall system power consumption by performing sensing only when necessary rather than continuously or periodically.
3Reliability
If continuous spectrum sensing is performed, then the cognitive system can maintain awareness of the spectrum environment, but power consumption increases and spectrum resources are wasted
Solution Approach 1:
The patent implements a feedback mechanism where terminal devices continuously monitor channel quality and report this information to the network device. Based on this feedback, the network device intelligently determines whether spectrum sensing is needed. When channel quality reports indicate stable and good conditions, the system suppresses sensing operations, maintaining spectrum awareness through terminal feedback rather than active sensing. When quality declines, sensing is triggered. This feedback-driven approach maintains reliability while reducing power consumption significantly compared to continuous sensing.
Solution Approach 2:
Instead of continuous sensing, the system uses periodic channel quality reporting from terminal devices as a proxy for spectrum monitoring. The terminal devices report channel quality at periodic intervals, and the network device uses this periodic information to decide whether to initiate sensing operations. This periodic action approach maintains spectrum awareness at lower power consumption by leveraging terminal device measurements rather than requiring continuous cognitive radio sensing operations.
Data Source
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AI summary
The embodiments of the present application relate to the technical field of wireless communications, and in particular to a method, system and device for triggering and performing spectrum sensing, used for solving the problem in the prior art that if the sensing period is set too long, a decline of service quality between an authorization system and a cognitive system or even a network paralysis will be caused due to interference; and if the sensing period is set too short, an increase in power consumption of devices and a waste of spectrum resources will be caused. The method for performing spectrum sensing in the embodiments of the present application includes: a sensing node judging whether or not the channel quality has declined to the requirement for performing in-band spectrum sensing; and after determining that the channel quality has declined to the requirement for performing in-band spectrum sensing, the sensing node performing in-band spectrum sensing. By way of applying the embodiments of the present application, the problems of decline of service quality between an authorization system and a cognitive system or even a network paralysis due to interference caused by setting the sensing period too long, or an increase in power consumption of devices and a waste of spectrum resources caused by setting period too short, can be avoided.