Patent ID: 8111681

Claim:
A wireless data-communication method in which a radiation pattern is specified for each channel in a time-division manner for communication between a base station and a wireless terminal, and an identification information for identifying a beam pattern is assigned for each of a plurality of beam patterns from the base station, the method comprising: the base station transmitting, with the beam pattern, a first individual pilot signal which is coded according to the identification information for identifying the beam pattern by the wireless terminal; the wireless terminal determining an area where the wireless terminal is located from a code of received first individual pilot signal; the wireless terminal transmitting determined area determination information; the base station determining a direction in which the wireless terminal is located according to the area determination information; transmitting from the base station a first slot that includes a common pilot channel transmitted to the wireless terminal in an omnidirectional manner or in a directional manner corresponding to a sector, an individual pilot channel transmitted with the beam pattern among the plurality of beam patterns, and a data channel for transmitting data to the wireless terminal with the beam pattern, the base station performing control, including synchronization, using the common pilot channel of the first slot and transmitting a second individual pilot signal with the radiation pattern including the beam pattern in the direction in which the wireless terminal is located, using the individual pilot channel of the first slot; the wireless terminal, located in the direction, receiving the second individual pilot signal and determining a data rate according to the reception quality of the second individual pilot signal; the wireless terminal transmitting to the base station a signal for requesting the determined data rate; and the base station receiving the signal, and based on the requested data rate, transmitting data to the wireless terminal with the radiation pattern same as the radiation pattern in which the second individual pilot signal was transmitted, using a data channel of a second slot which is a predetermined number of slots after the first slot.