VoIP Emergency Number Selection via Geographic Indicators
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Solution Overview
Problem
Mobile communications devices often lack the correct emergency call number when roaming outside their home network or country, and there is a need to facilitate accurate emergency calling in wireless local area networks (WLANs) using Voice Over Internet Protocol (VoIP).
Innovation Solution
A method and device that automatically select an emergency number by receiving a geographic indicator from a wireless access point, using a stored lookup table to determine the appropriate emergency number based on the received indicator, enabling VoIP calls in both WLAN and wireless wide area networks (WAN).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mobile communications devices use pre-programmed emergency call numbers, then emergency calling function is available in home network, but the device cannot select correct emergency number when roaming outside home network or country
Solution Approach 1:
The patent implements dynamic emergency number selection by receiving geographic indicators (such as MCC-MNC codes) from the current network operator and automatically selecting the appropriate emergency number based on the detected location. This dynamic adaptation allows the device to switch between pre-programmed home network numbers and locally appropriate numbers when roaming, ensuring reliable emergency calling regardless of location.
Solution Approach 2:
The patent introduces geographic indicators and lookup tables as intermediaries between the device and emergency services. The geographic indicator received from the network acts as a mediator that translates network location information into the correct emergency number selection, enabling the device to adapt to different countries and networks without manual configuration.
2Adaptability or versatility
If mobile communications devices store multiple emergency numbers for different countries, then the device can select correct number based on location, but the device complexity increases
Solution Approach 1:
The patent pre-loads lookup tables containing mappings between geographic indicators (MCC-MNC codes) and emergency numbers into the device's memory during manufacturing or initial setup. This preliminary action eliminates the need for complex runtime decision-making or manual configuration during roaming, as the device simply queries the pre-prepared lookup table with the received geographic indicator to obtain the correct emergency number.
Solution Approach 2:
The patent implements self-service by automatically receiving geographic indicators from the network, querying the internal lookup table, and selecting the appropriate emergency number without user intervention. The device autonomously manages the complexity of multiple emergency numbers through automatic geographic detection and lookup, freeing the user from manual configuration while maintaining high adaptability.
Data Source
AI summary
Automatically selecting an emergency number for use by a mobile communications device enabled for Voice Over Internet Protocol (VoIP) communications, including: receiving at the mobile communications device a geographic indicator in a beacon frame transmitted from a wireless access point of a wireless local area network that is connected to an Internet Protocol network; and determining from a plurality of emergency numbers stored in a storage element of the mobile communications device a selected emergency number in dependence on the received geographic indicator.