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In the US, mobile phones long ago surpassed landline phones and are now the most common way to contact emergency services. What emergency callers using their mobile device indoors may not realize however; is that a huge gap exists between their expectation of being located and the accuracy of current positioning technologies when used indoors.

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Signals Research Group (SRG) worked with Spirent Communications recently to complete a benchmark study of AT&T’s VoLTE service offering in Minneapolis-St. Paul. For SRG and its readership, the benefits are huge since these collaborative studies provide great insight into how 3GPP technologies, in general, as well as individual vendor implementations of these technologies, perform.  No marketing B.S., “just the facts, Ma’am.”

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The effects of multipath cannot be ignored as they can compromise the performance and accuracy of any receiver design. Put simply, multipath refers to the phenomenon of radio frequency (RF) signals reaching the receiver via two or more routes. It is caused by the original signal being reflected or diffracted, typically by a building, geological feature or even water.

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