Patent ID: 9307554
Filing Date: 2016-04-05
CPC Classification: G06K,H04W

Claim Text:
1. A method of reducing collision occurrence in a network for communicating between multiple readers and a plurality of radio frequency (RF) tags, the method comprising: transmitting by at least one reader of at least one wide band interrogation signal; receiving a response signal from a tag in response the interrogation signal; estimating, by the reader, a quantity of wide band response signals received in response to the interrogation signal; determining, by the reader, a round trip delay time of each of the wide band response signals; estimating, by the reader, whether a collision occurred between a plurality of the wide band response signals; when the collision is estimated to have occurred, transmitting, by the reader, at least one additional wide band interrogation signal, the additional wide band interrogation signal initiating a new communications session between the reader and the tag to reduce a collision probability between wide band response signals transmitted by the plurality of RF tags; and transmitting, by the reader, an acknowledgment packet to the tag such that;