BROADCASTING SHORT INTERFRAME SPACE INFORMATION FOR LOCATION PURPOSES

摘要

A method and apparatus for broadcasting short interframe space information to aid in determining a round trip time are provided. The round trip time is used as an aid in locating nodes within a WiFi or WLAN network. The method begins with capturing a time of transmission of a frame by a transmitting station. The receiving station then captures the time of arrival of the frame just sent by the transmitting station. The receiving station replies with a received frame message and the time of departure is captured. The transmitting station then captures the time of arrival of the received frame message. The captured arrival and departure times of the frame and the received frame message allow the round trip time to be computed. The RTT may then be included as part of a network message.

主权项

1. A method for estimating a position of a wireless node in a communication system, comprising:
computing a round trip time (RTT) of a frame using a turn-around calibration factor (TCF); comparing the computed RTT with RTTs of other nodes in the communication system; estimating the position of the node based on the comparison of the RTTs.