The FCC has issued a proposed rule that would require US carriers to provide vertical location data to emergency dispatchers when mobile users dial 911. The rule would take effect starting in April 2021, requiring that at least 80% of 911 calls provide vertical location data accurate to within three meters. This would help emergency dispatchers determine which floor of larger buildings callers are located on. The FCC first requested this capability in early 2014. The CTIA industry association established an implementation framework in late 2014, and carriers have been conducting tests since then. The FCC used data from these tests to make today's new rules.


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