Emergency calls have contrasting requirements of highly accurate positioning of the calling device and minimal impact to call setup time. It isn’t always possible to send fresh location information that is also highly accurate, especially for a caller that is moving. This disclosure describes techniques to improve the accuracy of the location sent during an emergency call with minimal impact on the call setup time. Upon placing an emergency call, position fixes for the calling device are continuously obtained and pruned for recency and accuracy. Upon the expiration of a timer, the most recent position fix with greatest accuracy is sent to the emergency service provider.
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Anonymous, "Transmitting Reliable Location Information via PIDF-LO in Emergency Calls", Technical Disclosure Commons, (March 30, 2022)