wherein the base station apparatus comprises a receiver which receives {TAIL ~ an uplink reference signal} transmitted from the user apparatus using {HEAD ~ the determined second sequence} identifier 
wherein the base station apparatus comprises a receiver which receives { TAIL ~ an uplink reference signal } transmitted from the user apparatus using { HEAD ~ the determined second sequence } identifier
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH