CPC G01S 13/0209 (2013.01) [H04W 4/12 (2013.01); H04W 64/00 (2013.01); H04W 72/0446 (2013.01); H04W 74/0816 (2013.01); H04W 74/0866 (2013.01)] | 20 Claims |
1. A method by a first ultra-wide band (UWB) device, the method comprising:
transmitting an initiation message (IM) for initiating UWB ranging in a first period of a first ranging round;
receiving an access message (AM) from a second UWB device in a second period of the first ranging round, the second period being a contention period used for a contention-based access;
transmitting a first reply message (RM) in a third period of the first ranging round, wherein the first RM includes information indicating a fourth period for the second RM; and
receiving a second RM corresponding to the first RM from the second UWB device in the fourth period of the first ranging round,
wherein the IM includes length information about a length of the contention period and slot status information about a status of a ranging slot included in the contention period.
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