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