| CPC G01S 13/0209 (2013.01) [H04W 4/80 (2018.02); H04W 48/16 (2013.01); H04W 80/10 (2013.01)] | 18 Claims |
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1. A method by a first ultra-wide band (UWB) device, the method comprising:
transmitting an initiation message for initiating UWB ranging in a first period of a first ranging round;
receiving, from at least one second UWB device, at least one device access message in a second period of the first ranging round;
transmitting a reply message in a third period of the first ranging round;
receiving, from one or more of the at least one second UWB device, at least one device reply message corresponding to the reply message in a fourth period of the first ranging round; and
transmitting, to the one or more second UWB device, at least one final message in a fifth period of the first ranging round, the at least one final message being generated based on UWB ranging performed using the at least one device access message, the reply message, and the at least one device reply message,
wherein the initiation message includes length information indicating a number of ranging slots in the second period, and status information indicating whether each of the ranging slots included in the second period is an empty slot or an occupied slot,
wherein the empty slot is available for a contention-based access and the occupied slot is scheduled for a known UWB device,
wherein the initiation message includes at least one identification (ID) of at least one known UWB device which participates in contention in an empty slot of a previous ranging round and the empty slot of the previous ranging round is set as the occupied slot of the first ranging round, and
wherein the status information includes a bit mask.
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