| CPC G01S 5/0036 (2013.01) [H04L 5/0051 (2013.01); H04W 24/10 (2013.01); H04W 80/02 (2013.01)] | 93 Claims |

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1. A method for determining a location of a mobile device, comprising:
sending, from the mobile device to a network server, a request for downlink positioning reference signals that includes on-demand positioning reference signal configuration information comprising at least one of:
a start time for on-demand positioning reference signal, or
a duration for on-demand positioning reference signal;
receiving assistance data based, at least in part, on the on-demand positioning reference signal configuration information; and
determining location information based, at least in part, on one or more downlink positioning reference signals associated with the on-demand positioning reference signal configuration information and the assistance data.
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