Unicast and Broadcast Protocols for Ranging and Direction Detection in Wireless Local Area Networks

摘要

The disclosed embodiments facilitate calibration of wireless channels, including ranging and direction detection, between wirelessly networked devices. In some embodiments, a method at a first station (STA) transmits a first NDPA frame to one or more second stations (STAs); and the first NDPA frame is Transmitting a second frame after a short interval frame space (SIFS) time interval, comprising a first bit indicating that one or more subsequent frames comprise ranging or angle information. The second frame is one of an NDP_az frame with information about the time of transmission of the null data packet az (NDP_az) frame, or a null data packet (NDP) frame, or a beam refinement protocol (BRP) frame possible. The first NDPA frame may be unicast, multicast or broadcast.