Dynamic Bandwidth Allocation for Public Safety Wireless Networks
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Solution Overview
Problem
In modern wireless networks, public safety users face challenges in accessing sufficient bandwidth during high-demand situations like natural disasters, as existing systems lack an efficient mechanism to dynamically allocate resources from commercial users when public safety bandwidth is insufficient.
Innovation Solution
A method and apparatus for admitting requests for wireless connection resources, where available bandwidth is logically divided between commercial and public safety users, allowing public safety users to borrow bandwidth from commercial users by preempting lower-priority users when necessary, without disrupting higher-priority public safety services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bandwidth is reserved separately for commercial users and public safety users, then commercial users have guaranteed bandwidth, but public safety users cannot access additional bandwidth during high-demand situations
Solution Approach 1:
The patent implements dynamic bandwidth allocation where the admission control function can preempt commercial bandwidth for public safety users based on real-time demand. The system transitions from static reserved bandwidth to dynamic sharing, allowing public safety users to borrow bandwidth during emergencies while commercial users retain bandwidth during normal operations.
Solution Approach 2:
The system changes the bandwidth allocation parameter dynamically based on user priority and demand conditions. Public safety users with higher priority can override commercial bandwidth allocation when needed, while commercial users maintain their allocation under normal conditions. This parameter change resolves the contradiction by making bandwidth allocation adaptive to situational needs.
2Quantity of substance
If public safety users can borrow bandwidth from commercial users, then public safety bandwidth availability increases, but commercial user service quality may deteriorate
Solution Approach 1:
The patent applies partial preemption where only the necessary amount of commercial bandwidth is borrowed to satisfy public safety demand, not all commercial bandwidth. The admission control function calculates the exact bandwidth needed and preempts only that portion, leaving remaining commercial bandwidth available for commercial users, thus balancing both needs.
Solution Approach 2:
The admission control function acts as an intermediary that mediates between public safety users and commercial users for bandwidth allocation. It evaluates both parties' needs and makes intelligent decisions about bandwidth preemption, ensuring that public safety users receive necessary bandwidth while minimizing impact on commercial user service quality.
3Quantity of substance
If lower-priority commercial users are preempted to free bandwidth, then public safety users gain access to bandwidth, but the number of active commercial connections decreases
Solution Approach 1:
The patent applies local preemption where only specific lower-priority commercial connections are affected, not all commercial users. The admission control function identifies and preempts only those commercial connections with lower priority than the public safety request, leaving higher-priority commercial connections intact. This localized approach minimizes the impact on overall commercial productivity while freeing necessary bandwidth.
Data Source
AI summary
A method and apparatus for admitting requests for allocation of bandwidth in a communication system is provided herein. During operation, available bandwidth is logically divided for use among commercial users and public-safety users, where the commercial users utilize a predefined portion of the bandwidth and the public-safety users utilize a public-safety portion of the bandwidth. When a public-safety bearer request is made, and available bandwidth does not exist within the public safety portion of the bandwidth, some bandwidth unoccupied by commercial users from commercial portion can be used to admit the bearer request. When commercial bandwidth is occupied by commercial users, lower priority commercial users can be preempted so that commercial bandwidth can be used to handle the bearer request. In a similar manner, the public-safety portion of available bandwidth can temporarily be used by commercial users.