To enhance reliability for emergency calls, if a user dials an emergency call center (ECC) and there is no available ECC service in the user equipment (UE), many UEs will scan and rescan available cell service frequencies for ECC request support. However, much of this rescanning is redundant or unprioritized. By eliminating aspects of redundant scanning based on prior scan results, and/or prioritizing certain known frequencies for additional scans based on prior scan results, both ECC request reliability and UE power consumption is improved.
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Chen, Edison and Tsao, Gary, "Early Determination Of Emergency Call Retry On Roaming Network", Technical Disclosure Commons, (April 10, 2022)