| CPC G08B 21/0446 (2013.01) [A61B 5/002 (2013.01); A61B 5/0205 (2013.01); A61B 5/024 (2013.01); A61B 5/1112 (2013.01); A61B 5/1117 (2013.01); A61B 5/1121 (2013.01); A61B 5/1123 (2013.01); A61B 5/681 (2013.01); A61B 5/7246 (2013.01); A61B 5/7264 (2013.01); A61B 5/7405 (2013.01); A61B 5/742 (2013.01); A61B 5/7455 (2013.01); A61B 5/746 (2013.01); A61B 5/747 (2013.01); G01C 5/06 (2013.01); G01C 21/12 (2013.01); G01S 19/13 (2013.01); G06F 3/011 (2013.01); G08B 13/2454 (2013.01); A61B 2503/10 (2013.01); A61B 2560/0242 (2013.01); A61B 2562/0219 (2013.01)] | 24 Claims |

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1. A method comprising:
obtaining, by a mobile device, a first signal indicating an acceleration measured by an accelerometer over a time period, and a second signal indicating an orientation measured by an orientation sensor over the time period, wherein the accelerometer and the orientation sensor are physically coupled to a user;
determining, by the mobile device, rotation data indication an amount of rotation experienced by the user during the time period;
determining, by the mobile device, that the user has tumbled based on the rotation data; and
responsive to determining that the user has tumbled, generating, by the mobile device, a notification indicating that the user has tumbled.
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