Distributed Dynamic Spectrum Allocation via Power Nodes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In distributed wireless communication networks, dynamic spectrum allocation without a central authority is challenging due to conflicts over licensed spectra and the difficulty in distinguishing idle channels, especially in cognitive radio networks where primary users' presence can disrupt spectrum usage.
Innovation Solution
A distributed dynamic spectrum allocation method using a source device and power nodes, where power nodes are dynamically selected and replaced based on trustworthiness, and a protocol that allows source devices to query and select idle licensed spectra without central management, ensuring accurate spectrum sensing and minimizing network load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic spectrum allocation is implemented in distributed wireless communication networks without a central authority, then spectrum utilization efficiency is improved, but conflicts occur when multiple devices request the same licensed spectrum
Solution Approach 1:
The patent introduces power nodes as intermediary entities that mediate between source devices and licensed spectrum resources. Power nodes receive spectrum requests, query sensing information from sensing channels, and allocate spectrum resources accordingly, thereby preventing conflicts without requiring a central authority. This intermediary layer enables distributed spectrum allocation while maintaining coordination and avoiding collisions.
2Productivity
If each router finds corresponding idle licensed spectrum independently, then local spectrum utilization is improved, but network load increases significantly
Solution Approach 1:
The patent merges the spectrum sensing and allocation functions into centralized power nodes rather than distributing these functions to every router. Multiple source devices and routers can share the spectrum allocation service provided by power nodes, reducing redundant sensing operations and lowering overall network load while maintaining efficient local spectrum utilization through the power nodes' coordinated allocation.
3Ease of operation
If individual spectrum sensing is used by devices, then device autonomy is improved, but measurement precision deteriorates due to deep shadowing and multipath fading
Solution Approach 1:
The patent introduces sensing channels as intermediary entities that perform spectrum sensing on behalf of devices. These sensing channels are specifically designed to detect licensed spectrum availability and provide accurate sensing information to power nodes, overcoming the limitations of individual device sensing caused by shadowing and multipath fading effects.
Solution Approach 2:
The sensing channels perform self-service by autonomously monitoring the licensed spectrum and providing sensing results to power nodes. This self-service mechanism enables accurate spectrum detection without requiring active participation from end devices, thereby maintaining device autonomy while achieving high measurement precision through dedicated sensing infrastructure.
4Measurement precision
If cooperative spectrum sensing is implemented, then sensing precision is improved, but device complexity increases due to information sharing requirements
Solution Approach 1:
The patent merges multiple sensing operations into centralized power nodes that coordinate spectrum sensing across the network. Instead of requiring individual devices to perform complex cooperative sensing and share information, the power nodes consolidate sensing functions and utilize sensing channel information, achieving high sensing precision while reducing device complexity by eliminating the need for distributed information sharing protocols.
Data Source
Figure 1~2
Figure 3~5
AI summary
The present invention involves a method for distributed dynamic spectrum allocation performed by a source device and the source device, a method for dynamic spectrum allocation performed by a power node and the power node, the method comprising: sending to appropriate power nodes a query message indicating that the source device requests to find an idle licensed spectrum; receiving from the appropriate power nodes a query response message indicating licensed spectrums; and determining whether the licensed spectrums are idle and selecting an idle licensed spectrum from the licensed spectrums to be used. In this way, the provided method may implement distributed dynamic spectrum allocation without using a central authority.