Abstract: Aspects of the subject disclosure may include, for example, a method of determining, by a processing system, complete neighbor information for a plurality of radio devices in a wireless network, wherein the complete neighbor information denotes neighboring radio devices; establishing, by the processing system, a backbone list including radio devices that provide beacons, wherein the backbone list includes a first radio device of the plurality of radio devices; determining, by the processing system, a set of radio devices in the plurality of radio devices that are not neighboring radio devices of every radio device in the backbone list; adding, by the processing system, an additional radio device from the plurality of radio devices to the backbone list responsive to an existence of at least one radio device in the set, wherein the additional radio device has at least one neighboring radio device in the backbone list and has at least one neighboring radio device in the set; and repeating, by the processing syst

Abstract: Devices, systems, and method for compensating for non-line-of-sight (“NLOS”) bias in time difference of arrival (“TDOA”) estimates between a first anchor and a second anchor in a network having an obstacle in the line-of-sight therebetween are provided. The systems and methods include transmitting a first packet from a first anchor; indirectly receiving the first packet by a second anchor, then transmitting a second packet by the second anchor; indirectly receiving the second packet by the first anchor; and receiving the first packet and the second packet by a mobile node. The true fly-time of the first or second packets between the first anchor and the second anchor and the bias in time of flight of the first or second packets between the first anchor and the second anchor are estimated. The time difference of arrival at the mobile device between a direct path and an indirect path is further estimated and the NLOS bias in the time difference of arrival estimated at the mobile device is corrected.

Abstract: A system and method for locating a mobile device is disclosed. In a first embodiment, a system of provisioning multiple-tired location services is disclosed. The system includes a plurality of ultra-wideband devices forming a first level of a wireless infrastructure network and a plurality of location capable beacon devices forming a second level of the wireless infrastructure network. In a second embodiment, a method of providing location based services using location capable beacon devices is disclosed. In other embodiments a system for generating real-time safety alerts is further disclosed.