Context-aware collaborative user tracking

A method, comprising:

• receiving, from one or more user devices of a user, user proximity information that indicates whether the user is in proximity of the one or more user devices, tracking loss warnings that indicate that loss of capabilities to track the user by respective user devices may be imminent, and secondary device proximity information that indicates whether the user device is in proximity of one or more secondary devices of other users or of an infrastructure, unassociated with any particular user;
• receiving, from the one or more secondary devices of other users or of an infrastructure, unassociated with any particular user, additional user proximity information that indicates whether the user is in proximity of the one or more secondary devices of other users or of an infrastructure, unassociated with any particular user;
• and
• dynamically determining from one or more of the user proximity information, the tracking loss warnings, the secondary device proximity information, or the additional user proximity information, which of the user devices and secondary devices are in proximity of the user and can receive communications directed to the user.

A non-transitory computer readable medium encoded with a computer program that includes instructions to cause a processor to:

• receive, from one or more user devices of a user, user proximity information that indicates whether the user is in proximity of the one or more user devices, tracking loss warnings that indicate that loss of capabilities to track the user by respective user devices may be imminent, and secondary device proximity information that indicates whether the user device is in proximity of one or more secondary devices of other users or of an infrastructure, unassociated with any particular user;
• receive, from the one or more secondary devices of other users or of an infrastructure, unassociated with any particular user, additional user proximity information that indicates whether the user is in proximity of the one or more secondary devices of other users or of an infrastructure, unassociated with any particular user;
• and
• dynamically determine from one or more of the user proximity information, the tracking loss warnings, the secondary device proximity information, or the additional user proximity information, which of the user devices and secondary devices are in proximity of the user and can receive communications directed to the user.