Here, as {HEAD ~ the number} of {TAIL ~ types} of CAZAC sequences used for the reference signal is small, a sequence specific to each cell is allocated 
of
Here , as { HEAD ~ the number } of { TAIL ~ types } of CAZAC sequences used for the reference signal is small , a sequence specific to each cell is allocated
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH