Dynamic Spectrum Allocation for Public Safety Preemption
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Solution Overview
Problem
In communications systems, especially for public safety applications, there is a challenge in dynamically allocating shared spectrum between commercial and public safety users, leading to contention during increased public safety needs, such as emergencies, without efficiently reallocating bandwidth.
Innovation Solution
A dynamic allocation mechanism that allows public safety users to preempt commercial use of spectrum when needed, reallocating bandwidth based on priority and availability, and reverting it back when the emergency subsides, using a call processing server to manage and coordinate this process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spectrum is shared between commercial and public safety users, then spectrum utilization efficiency is improved, but contention occurs when public safety needs increase during emergencies
Solution Approach 1:
The patent implements dynamic spectrum allocation where the spectrum sharing arrangement can change based on conditions. During normal operations, spectrum is shared efficiently between commercial and public safety users. During emergencies, the system dynamically reallocates spectrum to prioritize public safety communications, resolving the contradiction between efficient sharing and reliable emergency communication.
Solution Approach 2:
The system changes the allocation parameters of spectrum resources based on emergency conditions. When an emergency is detected, the allocation ratios and priorities are modified to ensure public safety users receive sufficient bandwidth, while maintaining efficient spectrum utilization during non-emergency periods.
2Quantity of substance
If additional bandwidth is allocated to public safety users during emergencies, then public safety communication capability is improved, but commercial service quality may deteriorate
Solution Approach 1:
The patent segments the spectrum into different portions with different allocation rules. A primary portion is allocated to public safety users with guaranteed access during emergencies, while a secondary portion is available for commercial use during normal operations. This segmentation allows the system to provide additional bandwidth to public safety users without completely disrupting commercial services.
Solution Approach 2:
The system employs an intermediary mechanism (spectrum management entity) that coordinates between public safety and commercial users. This intermediary monitors emergency conditions and mediates spectrum allocation, ensuring public safety users receive necessary bandwidth while minimizing impact on commercial services through coordinated reallocation rather than outright denial.
3Loss of time
If spectrum reallocation is performed automatically during emergencies, then response time is improved, but system complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring spectrum allocation policies and emergency response procedures before emergencies occur. The system pre-identifies public safety users, pre-establishes allocation rules, and pre-configures the reallocation mechanisms. When an emergency occurs, these pre-prepared arrangements enable automatic reallocation without complex real-time decision-making, reducing both response time and operational complexity.
Data Source
AI summary
In a communications spectrum shared by public safety users and commercial users, in the event of an emergency condition, commercial users are preempted and corresponding bandwidth is reallocated to authorized public safety users. When the emergency condition subsides, the reallocated bandwidth is made available for commercial use. Reallocation and preemption can be initiated by an authorized public safety entity and/or can be initiated when public safety usage exceeds a predetermined usage threshold.