Dynamic Spectrum Allocation in Wireless Systems
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Solution Overview
Problem
In wireless communication systems, the frequent changes in secondary system states lead to constant recalculations of available spectrum resources, resulting in a high number of information exchanges and system reconfigurations, which is inefficient and can interfere with primary systems.
Innovation Solution
A system that acquires state information of secondary systems, determines initial and estimated available spectrum resources, and adjusts the actually-used spectrum resources based on these calculations to minimize reconfigurations and information exchanges, ensuring protection of primary systems while optimizing spectrum utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the secondary system frequently adjusts spectrum resources based on state changes, then the spectrum utilization efficiency is improved, but the number of information exchanges and system reconfigurations increases
Solution Approach 1:
The patent implements periodic spectrum resource adjustment by triggering recalculations only at specific events (state changes) rather than continuously. The management system determines available spectrum resources periodically when secondary system state information changes, reducing the frequency of information exchanges while maintaining efficient spectrum utilization.
Solution Approach 2:
The secondary system autonomously determines its actually-used spectrum resources by comparing estimated available resources with initial available resources, without requiring constant management system intervention. This self-service mechanism reduces information exchanges while ensuring efficient spectrum usage through local decision-making.
2Productivity
If the secondary system uses available spectrum resources dynamically, then the spectrum resource utilization is improved, but the risk of interfering with the primary system increases
Solution Approach 1:
The patent implements a feedback mechanism where the management system receives state information from secondary systems, recalculates available spectrum resources based on current conditions, and provides updated resource allocations. This closed-loop feedback ensures dynamic spectrum utilization while continuously monitoring and preventing primary system interference through interference level assessments.
Solution Approach 2:
The management system performs preliminary calculations of available spectrum resources and interference levels before allocating resources to secondary systems. By pre-assessing interference conditions and determining safe resource allocations in advance, the system enables dynamic spectrum usage while preventing harmful interference to primary systems.
3Measurement precision
If the database constantly recalculates available spectrum resources, then the accuracy of resource allocation is improved, but the loss of time and system efficiency deteriorates
Solution Approach 1:
The database performs recalculations periodically based on triggering events (secondary system state changes) rather than continuously. This event-driven periodic approach maintains accurate resource allocation by updating only when necessary, significantly reducing the time spent on unnecessary recalculations while preserving allocation accuracy.
Solution Approach 2:
The management system performs preliminary assessments of state changes to determine whether recalculations are necessary before executing full resource allocation updates. This preliminary filtering action reduces the frequency of time-consuming recalculations while maintaining accuracy by recalculating only when state changes actually affect resource availability.
Data Source
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AI summary
A system and a method in a wireless communication system is disclosed. The system, comprising: circuitry, configured to obtain state information of one or more secondary systems managed by the system in a management region; determine first radio resources of a primary system available for the secondary systems based on the state information and allow the secondary systems to use the first radio resources; identify a change of the state information; determine second radio resources of the primary system available for the secondary systems based on the change; and request the secondary systems to use the second radio resources if the second radio resources is smaller than the first radio resources.