High precision network synchronization in an indoor position location system

摘要

Methods, systems, and devices for synchronizing a position location network. The methods, systems, and/or devices may provide for designating as a master AP one AP from a network. The master AP may broadcast synchronization signals, which other APs in the network may use to synchronize their respective oscillators and/or clocks. In some cases, the master AP and/or a network server (e.g., a tracking management server) may designate acting master APs. The acting master APs may, for example, broadcast synchronization signals to neighboring APs. The acting master APs and/or the master AP may maintain lists of synchronized APs, which may be transmitted among APs and/or to a network server.

主权项

1. A method of synchronizing a position location network, comprising:
broadcasting a first synchronization message from a master access point (AP), wherein the first synchronization message comprises an ultra-wideband signal, and wherein the master AP comprises a reference oscillator and a timer; receiving, at the master AP, a first acknowledgment message from each AP that synchronized to the master AP based on the first synchronization message; designating as acting master APs one or more APs from which an acknowledgment message is received, wherein the one or more designated acting master APs are configured to broadcast a second synchronization message; and receiving, at the master AP from the one or more designated acting master APs, one or more lists of neighboring APs synchronized to the one or more designated acting master APs.