Cell Access Control for Priority Call Pre-emption
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Solution Overview
Problem
CSG cells often face resource constraints, leading to an inability to establish priority calls, such as emergency calls, due to congestion, and existing technologies do not effectively manage resource allocation to ensure successful completion of such calls.
Innovation Solution
Implementing methods to assess and hand over non-emergency calls to other cells when an emergency call is initiated, ensuring sufficient resources are available by using specific triggers and timers to manage handovers and prevent resource-intensive non-emergency calls from disrupting emergency calls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If CSG cells allow access to both authorized and unauthorized users, then the cell can serve more users, but the resource constraints make it unable to establish priority calls during congestion
Solution Approach 1:
The patent implements dynamic admission control that changes the cell's access policy based on current conditions. When congestion is detected or a priority call is detected, the system dynamically shifts from accepting both authorized and unauthorized users to restricting access to ensure priority call establishment. This dynamic adjustment resolves the contradiction by adapting the cell's behavior to current resource availability and call types.
Solution Approach 2:
The system changes the admission control parameter based on the call type and current load. By modifying the access restriction parameter dynamically - allowing hybrid mode during normal conditions but switching to authorized-only mode during congestion or when priority calls are detected - the system maintains both versatility and reliability across different operational states.
2Device complexity
If CSG cells restrict access to authorized users only, then resource allocation is simplified, but the cell cannot serve unauthorized users who may need emergency services
Solution Approach 1:
The system dynamically adjusts the access control policy based on detected conditions. During normal operation, the cell operates in hybrid mode accepting both authorized and unauthorized users. When congestion is detected or a priority call is identified, the system dynamically switches to restricted mode, thereby simplifying resource allocation while maintaining versatility during normal conditions.
Solution Approach 2:
The system continuously monitors call types and resource availability, using this feedback to adjust access control policies. This feedback mechanism allows the cell to simplify control when conditions permit while expanding access coverage when needed, resolving the contradiction between control simplicity and user coverage.
3Productivity
If the cell accepts non-emergency calls during high load, then the cell can maintain service availability, but resource-intensive non-emergency calls may disrupt emergency calls
Solution Approach 1:
The system dynamically adjusts admission control based on the detected call type. When an emergency call is detected or congestion is identified, the system dynamically restricts acceptance of non-emergency calls to preserve resources for emergency services. During normal conditions, the cell maintains full productivity by accepting both call types. This dynamic adjustment ensures emergency call reliability while maintaining overall productivity during normal operation.
Solution Approach 2:
The system changes the call acceptance parameter based on priority levels and load conditions. By modifying the admission control parameter to reject non-emergency calls during high load or when emergency calls are detected, the system protects emergency call quality while maintaining the ability to handle diverse call types during normal conditions.
4Reliability
If the cell pre-empts non-emergency calls to ensure emergency call resources, then emergency call reliability improves, but the cell's overall resource utilization decreases
Solution Approach 1:
The system dynamically adjusts resource allocation based on real-time conditions. Instead of continuously reserving resources for emergency calls, the system dynamically switches from accepting all call types during normal conditions to restricting non-emergency calls only when congestion or emergency calls are detected. This dynamic approach ensures emergency call reliability when needed while maximizing overall productivity during normal operation.
Solution Approach 2:
The system changes the resource allocation parameter dynamically based on call type priority and load conditions. By modifying the admission control parameter to allow all call types during normal conditions but restricting non-emergency calls during high load or when emergency calls are detected, the system optimizes both emergency call reliability and overall resource utilization across different operational states.
Data Source
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AI summary
A method is provided for managing a priority call in a serving cell. The method comprises, when a priority call is in progress in the serving cell, an access device in the serving cell determining an amount of resources available in the serving cell. The method further comprises when the amount of resources available in the serving cell is below a threshold, the access device causing at least one non-priority call in the serving cell to be handed over to a target cell.