Dynamic Spectrum Access Interference Suppression via Priority-Based Precoding
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Solution Overview
Problem
Current interference suppression methods in dynamic frequency spectrum access systems do not consider the priorities of secondary devices, leading to inefficient spectrum utilization and potential interference between secondary devices, which affects the quality of service (QoS) for both primary and secondary devices.
Innovation Solution
The implementation of transmission precoding on secondary devices, taking into account their priority levels, along with the use of an interference leakage weighting factor to manage power allocation and minimize interference, ensures differentiated QoS for secondary devices and reduces interference with primary devices and other secondary devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional power control method is used for secondary devices, then interference to primary device is suppressed, but transmission power of secondary device is limited and spectrum utilization is reduced
Solution Approach 1:
The patent applies local quality by differentiating interference suppression strategies based on secondary device priority levels. High-priority secondary devices receive more lenient power control parameters allowing higher transmission power, while low-priority devices receive stricter control. This localized differentiation resolves the contradiction by allowing higher overall spectrum utilization through selective relaxation of power limits for devices that can tolerate or contribute less to interference.
Solution Approach 2:
The patent changes the power control parameters dynamically based on priority levels and interference conditions. By adjusting transmission power limits, power spectral density constraints, and admission control thresholds according to secondary device priority, the system achieves both interference suppression and improved spectrum utilization. The parameter changes enable flexible trade-off between protection of primary devices and efficient use of spectrum by secondary devices.
2Reliability
If interference suppression is strengthened for all secondary devices, then primary device communication quality is maintained, but QoS differentiation for secondary devices is lost
Solution Approach 1:
The patent implements local quality by applying different interference suppression levels to secondary devices based on their priority classifications. High-priority secondary devices receive preferential treatment with relaxed power constraints and higher allowed transmission powers, while low-priority devices undergo stricter interference suppression. This resolves the contradiction by maintaining primary device quality through selective suppression rather than uniform suppression, thereby preserving QoS differentiation capabilities.
Solution Approach 2:
The patent introduces dynamic interference suppression that adapts to secondary device priority levels and real-time interference conditions. The power control parameters, admission control decisions, and resource allocation are dynamically adjusted based on priority assignments. This dynamic approach allows the system to maintain primary device communication quality while simultaneously providing differentiated QoS to secondary devices, resolving the contradiction between uniform protection and flexible service differentiation.
3Productivity
If transmission power of secondary device is increased to improve spectrum utilization, then interference to other secondary devices increases
Solution Approach 1:
The patent applies local quality by implementing priority-based power control where high-priority secondary devices are permitted to transmit at higher power levels while low-priority devices are constrained to lower power levels. This differentiated approach resolves the contradiction by allowing increased overall spectrum utilization through selective high-power transmissions from priority devices, while lower-power transmissions from non-priority devices minimize mutual interference. The local quality principle ensures that power increases are concentrated where they provide maximum utility rather than causing widespread interference.
Solution Approach 2:
The patent introduces priority-based power control mechanisms and interference coordination protocols as intermediaries between secondary devices. These intermediaries mediate power level decisions by considering both the desired spectrum utilization and the potential for mutual interference. Through priority-aware power allocation and coordination signaling, the system enables higher overall transmission powers for improved spectrum utilization while the intermediary control mechanisms prevent excessive mutual interference by coordinating transmissions and adjusting powers based on priority levels and interference measurements.
Data Source
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AI summary
Disclosed are an interference suppressing method and device in a dynamic frequency spectrum access (DSA) system. The system comprises: a frequency spectrum management device, a primary system comprising a plurality of primary devices, and a secondary system comprising a plurality of secondary devices. The method comprises: transmitting position information of each of the secondary devices to the frequency spectrum management device; determining, by the frequency spectrum management device, a weight factor for a specific secondary device according to the received position formation; and performing a second-stage precoding, and in the second-stage precoding, adjusting, by using the weight factor, an estimated power of the specific secondary device leaking to the other secondary device.