Patent ID: 8908615

Claim:
A base station (BS), comprising: a plurality of antennas; a backhaul interface, being configured to receive a signal from a computing apparatus, the signal indicating that each of the antennas is able to use a plurality of predetermined subcarriers; and a processing unit, being configured to perform the following operations for each of the antennas: generating a first BS superframe comprising a first kind frame and a second kind frame, each of the first and second kind frames comprising a plurality of subframes, each of the first and second kind frames defining a downlink access zone and a downlink relay zone, allocating a reference signal of the antenna in a first Orthogonal Frequency-Division Multiplexing (OFDM) symbol in only one of the subframes in the first kind frame, the first OFDM symbol belonging to the downlink access zone of the first kind frame, allocating the reference signal in a second OFDM symbol in only one of the subframes in the second kind frame, the second OFDM symbol belonging to one of the downlink access zone and the downlink relay zone, and recording a piece of information in the first BS superframe, the piece of information being related to a location of the reference signal in each of the first and second kind frames, wherein each of the antennas is configured to transmit the corresponding first BS superframe by the corresponding predetermined subcarriers.