Detecting falls using a mobile device

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.

A method comprising:

• obtaining, by a mobile device, sample data generated by a plurality of sensors over a time period, wherein the plurality of sensors is worn by a user, and
• wherein the sample data comprises motion data indicating a motion of the user obtained from one or more motion sensors of the plurality of sensors, and at least one of:
• location data indicating a location of the mobile device obtained from one or more location sensors of the plurality of sensors,
• altitude data indicating an altitude of the mobile device obtained from one or more altitude sensors of the plurality of sensors, or
• heart rate data indicating a heart rate of the user obtained from one or more heart rate sensor of the plurality of sensors,
• determining, by the mobile device, that the user has fallen based on the sample data;
• and
• responsive to determining that the user has fallen, generating, by the mobile device, one or more notifications indicating that the user has fallen.