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1. (WO2011149497) TWO-WAY RANGING MESSAGING SCHEME

Pub. No.:    WO/2011/149497    International Application No.:    PCT/US2010/061930
Publication Date: Dec 1, 2011 International Filing Date: Dec 22, 2010
IPC: G01S 5/14
G01S 13/76
Applicants: QUALCOMM INCORPORATED
EKBAL, Amal
JULIAN, David Jonathan
BUDIANU, Petru Cristian
Inventors: EKBAL, Amal
JULIAN, David Jonathan
BUDIANU, Petru Cristian
Title: TWO-WAY RANGING MESSAGING SCHEME
Abstract:
In a two-way ranging scheme where a first apparatus (e.g., device) determines a distance to a second apparatus (e.g., device), specified packets are sent between these apparatuses at specified times to facilitate the determination of the distance. In some aspects, these packets may be defined and/or sent in a manner that enables the apparatuses to detect a leading edge of a received packet with a high degree of accuracy. For example, an apparatus may transmit a packet a defined period of time after transmitting or receiving another packet. In addition, a packet may comprise a defined symbol sequence that is used by an apparatus that receives the packet to identify a leading edge of the packet.