Spectrum Manager Nodes for Quiet Spectrum Allocation
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Solution Overview
Problem
The challenge lies in efficiently allocating unused portions of the radio spectrum to secondary users due to the 'hidden node' problem, where non-primary users cannot determine if a primary user is receiving, leading to potential interference when they transmit, and existing solutions have been hindered by complex technical issues.
Innovation Solution
A network of spectrum manager nodes monitors the radio spectrum to identify quiet periods and temporarily assign these to non-primary users, overriding their use when a primary user begins transmitting, using modules for monitoring, communication, and managing spectrum allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-primary users transmit in assigned spectrum bands, then spectrum utilization is improved, but interference to primary users occurs due to the hidden node problem
Solution Approach 1:
The patent introduces spectrum manager nodes as intermediary entities that mediate between non-primary users and primary users. These nodes continuously monitor the spectrum for primary user transmissions and relay this information to non-primary users, enabling them to transmit during quiet periods without causing interference. The intermediary resolves the hidden node problem by providing centralized spectrum awareness.
Solution Approach 2:
The system implements feedback mechanisms where spectrum manager nodes continuously monitor primary user transmissions and provide real-time information to non-primary users. This feedback loop allows non-primary users to adjust their transmission behavior based on current spectrum conditions, transmitting only when primary users are not active, thus avoiding interference while maximizing spectrum utilization.
2Reliability
If spectrum is allocated to primary users in wide bands, then interference between adjacent bands is prevented, but spectrum efficiency deteriorates due to unused quiet periods
Solution Approach 1:
The patent segments the spectrum allocation into primary user allocations and secondary opportunities. Within primary user allocated bands, the system identifies and segments out the quiet periods when primary users are not transmitting. These segmented quiet periods are then allocated to non-primary users, allowing efficient utilization of spectrum without compromising primary user protection.
Solution Approach 2:
The system dynamically adjusts spectrum allocation based on real-time primary user activity. Instead of static wide band allocations, the spectrum available to non-primary users changes dynamically according to when primary users are transmitting or quiet. This dynamic approach maintains interference prevention while maximizing spectrum efficiency by utilizing previously wasted quiet periods.
3Productivity
If spectrum manager nodes monitor and manage spectrum allocation, then interference is avoided and utilization improves, but system complexity increases
Solution Approach 1:
The spectrum manager nodes are designed as multi-functional entities that perform spectrum monitoring, primary user detection, non-primary user management, and dynamic allocation simultaneously. By consolidating these functions into universal nodes, the system manages complexity through functional integration rather than separate specialized components for each task.
Solution Approach 2:
The spectrum manager nodes autonomously monitor the spectrum, detect primary user transmissions, and manage non-primary user allocations without requiring complex centralized control or manual intervention. The nodes self-organize and self-manage the spectrum allocation process, reducing overall system complexity while maintaining high utilization through automated decision-making.
Data Source
AI summary
Present embodiments provide methods and systems for identifying quiet and/or under utilized segments of the radio spectrum and assigning the identified spectrum to non-primary license holders. The methods and systems may include spectrum management nodes for monitoring frequency bands of the radio spectrum for transmission by a primary user. When a primary user is not transmitting, segments of the quiet spectrum may be assigned to a non-primary user.