Patent ID: 11902069
Assignee: NTT DOCOMO, INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A base station comprising:
a receiver that,
if configuration information of a demodulation reference signal (DMRS) having a greater number of configurable ports than a given number is transmitted to a terminal, receives a first DMRS that is:
mapped to first resource elements having mutually different frequencies, a number of the first resource elements being a number greater than two, and
transmitted upon a frequency domain orthogonal cover code (FD-OCC) having a sequence length of the number greater than two being applied to the first DMRS, and

if the configuration information is not transmitted to the terminal, receives a second DMRS that is:
mapped to second resource elements having mutually different frequencies, a number of the second resource elements being the number greater than two, and
transmitted upon an FD-OCC having a sequence length of two being applied to the second DMRS; and

a processor that controls a reception process of the first DMRS or the second DMRS.