Wireless Emergency Alert Cell/Sector Selection Using True Effective Radius
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Solution Overview
Problem
Wireless Emergency Alerts (WEAs) often face issues with undershoot and overshoot due to mismatches between cell/sector boundaries and alert area boundaries, leading to incomplete or excessive broadcast coverage, which can be exacerbated by the limitations of current cell/sector selection techniques and the varying capabilities of mobile devices to perform device-based geo-fencing.
Innovation Solution
Utilizing a careful estimation of the 'true effective radius' of each cell/sector within the alert area boundaries to select cells/sectors for broadcast, combined with device-based geo-fencing capabilities of WEA 3.0 capable mobile devices, to ensure comprehensive alert coverage within the alert area while minimizing excessive broadcasting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell/sector boundaries are used for alert broadcast selection, then cellular coverage is ensured accommodating population density and terrain, but mismatch with alert area boundaries causes undershoot or overshoot of alert delivery
Solution Approach 1:
The patent segments the alert area into multiple geographic zones (e.g., grid cells or polygons) and selectively activates only the cell/sectors that correspond to these segments. This allows precise control over which cells broadcast the alert, enabling the broadcast area to closely match the alert area boundaries while maintaining cellular coverage reliability through systematic cell selection.
Solution Approach 2:
The patent applies different broadcast behaviors to different spatial locations by determining whether each cell/sector is fully contained within, partially overlapping, or completely outside the alert area. Cells fully within the alert area receive the alert, while cells outside or partially overlapping are excluded or handled differently, creating local variations in broadcast quality that achieve precise geographic targeting.
2Reliability
If cell/sector selection crosses alert area boundaries to ensure complete coverage, then all devices inside alert area receive alert, but devices outside alert area also receive alert (overshoot)
Solution Approach 1:
The patent performs preliminary spatial analysis to determine the exact geometric relationship between each cell/sector and the alert area before initiating the alert broadcast. By pre-calculating which cells are fully contained within the alert area boundaries, the system can confidently activate only those cells, ensuring complete coverage of the alert area without the need to cross boundaries, thus preventing overshoot while maintaining reliability.
3Object-generated harmful factors
If cell/sector selection is restricted inside alert area boundaries to avoid overshoot, then broadcast stays within alert area, but mobile devices inside alert area may not receive broadcast (undershoot)
Solution Approach 1:
The patent implements a dynamic cell selection strategy that adapts to the specific geometry of each alert area. Rather than applying a fixed rule, the system dynamically evaluates the spatial relationship between each cell and the alert area boundaries, selecting cells based on real-time geometric calculations. This dynamic approach ensures that the selected cells fully cover the alert area while maintaining the constraint of not broadcasting outside the designated area.
4Adaptability or versatility
If traditional cell/sector selection methods are used, then network infrastructure compatibility is maintained, but device-based geo-fencing capabilities are not utilized, reducing alert delivery precision
Solution Approach 1:
The patent creates a universal alert delivery system that functions across multiple device types and network configurations. By implementing a hybrid approach that works with both traditional network-controlled cell selection and modern device-based geo-fencing capabilities, the system achieves broad network compatibility while simultaneously enabling precise alert targeting when device capabilities allow, thus serving multiple functions within a single framework.
Data Source
AI summary
Systems and methods are discussed herein for an optimal approach for wireless emergency alerting within cells of wireless communication networks by using a careful estimation of a “true effective radius” of each cell/sector to eliminate broadcasts falling short of alert area boundaries (with users in such gaps in coverage not receiving an alert despite being in the designated alert area). By utilizing true provisioning information of each cell/sector that is at least partly within the alert area boundaries to understand the true effective radii of particular cell sectors can be selected for broadcast of the alert such that the entire alert area is covered for broadcasting of the alert without excessive over-broadcasting, e.g., broadcasting excessively beyond the alert area boundaries. Alerts can then be broadcast within each selected cell sector.