User plane location services over session initiation protocol (SIP)

A location server comprising:

• a memory configured to store machine readable instructions;
• and
• at least one processor configured to access the memory and execute the machine readable instructions, the machine readable instructions being configured to:
• generate an instant message for a particular wireless device in response to receiving a location request for the particular wireless device;
• provide the instant message to an instant message server for delivery to the particular wireless device;
• and
• receive location information for the particular wireless device via a User Plane Location Services session, wherein the location information is provided from the particular wireless device in response to receipt of the instant message.

A method comprising:

• receiving, at a wireless device, an instant message that includes information for triggering a User Plane Location Services procedure;
• initiating, by the wireless device, a User Plane Location Services session with a location server in response to receipt of the instant message;
• and
• providing, from the wireless device, location information characterizing a current location of the wireless device to the location server via the User Plane Location Services session.