Access Probe Suppression for Emergency Call Priority
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Solution Overview
Problem
In wireless communication systems, the reverse link air interface can become overwhelmed during events like emergencies or sports events, leading to access probe collisions and delayed or blocked calls due to excessive access probe transmissions from multiple users.
Innovation Solution
A method where the RAN broadcasts a control signal to suppress access probe transmissions from certain wireless communication devices during high-loading events, ensuring sufficient access channel capacity for high-priority devices or applications, such as emergency service personnel, by designating a silent-period for non-priority devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If access probes are transmitted by multiple wireless communication devices simultaneously during high-loading events, then the access channel capacity is fully utilized, but access probe collisions occur and call setup is delayed or blocked
Solution Approach 1:
The patent applies local quality by differentiating treatment between priority and non-priority wireless communication devices. Non-priority devices are subjected to transmission suppression during high-loading events, while priority devices maintain normal transmission rights. This selective differentiation resolves the contradiction by localizing the restriction to specific device categories rather than applying uniform constraints across all devices.
Solution Approach 2:
The patent segments the wireless communication devices into priority and non-priority groups based on service level agreements or device characteristics. This segmentation allows the system to manage access probe transmissions differently for each group, enabling full utilization of access channel capacity for priority devices while suppressing transmissions from non-priority devices during high-loading events, thereby preventing collisions and ensuring call setup reliability.
2Reliability
If access probe transmission is suppressed for all devices during high-loading events, then access probe collisions are reduced, but call setup is delayed for priority users
Solution Approach 1:
The patent applies local quality by exempting priority wireless communication devices from the transmission suppression mechanism. While non-priority devices experience transmission restrictions to reduce collisions, priority devices maintain their transmission rights unaffected. This ensures that call setup time for priority users is not increased, while still achieving collision reduction through selective suppression of non-priority device transmissions.
3Device complexity
If uniform access probe transmission rules are applied to all devices, then system management is simplified, but high-priority services cannot receive preferential treatment
Solution Approach 1:
The patent implements local quality by applying different access control rules to different device categories. The system maintains simple uniform rules for priority devices (unrestricted transmission) while applying suppression rules to non-priority devices during high-loading events. This differentiated approach enables service priority differentiation without significantly complicating the overall access control mechanism, as the differentiation is based on device classification rather than complex real-time decision-making.
Data Source
AI summary
A method and system for managing access probe transmission in a wireless communication system. Upon determining that an external impact event, such as a severe weather event, natural disaster, criminal activity, has occurred, base stations may wirelessly broadcast a control signal that causes certain wireless communication devices served by the base stations to suppress transmission of access probes, while allowing other wireless communication devices served by the base stations to still transmit access probes. In a given coverage area, suppression of access probe transmission by one or more wireless communication devices may thereby free up access channel capacity to facilitate calls or other communications by other wireless communication devices, such as first-responder devices for instance.