a uwb communication method according to ieee 802 15 3a the access point 10 may transmit a clock synchronization packet csp to each of the uwb tags 20 and receive a response packet from each of the uwb tags 20 also each of the uwb tags 20 receives a unique value receives the csp from the access point 10 and transmits a response packet based on a period t csp according to the csp in response to the received csp and a unique value of the tag a time diagram of fig2 is referred to describe a detailed signal flow among the access point 10 and the plurality of uwb tags 20 as illustrated in fig2 from left to right with respect to a time axis t r t 1 t 2 t 3 t k t k 1 and t r are displayed the preceding t r represents a reference time at which a preceding clock synchronization packet csp n from the access point is received by each of the uwb tags the succeeding t r represents a reference time at which a following clock synchronization packet csp n 1 is received from the access point fig2 will be described with a focus on a flow of.