Patent ID: 8259697
Filing Date: 2012-09-04
Classification: H04B,H04L,H04W

Abstract:
1. A transmission method performed by a mobile station of obtaining random access diversity, the method comprising: (a) transmitting a random access channel (RACH) burst signal to a base station, by using a transmission antenna selected from among multiple transmission antennas; (b) if an acknowledgement (ACK) response to the RACH burst signal from the base station is received, transmitting user packet data by using the transmission antenna which is used for transmission of the RACH burst signal; (c) if a non-acknowledgement (NACK) response to the RACH burst signal from the base station is received, transmitting a new RACH burst signal to the base station, by using a transmission antenna different from the previous transmission antenna; and (d) if an ACK has not been received from the base station and all the multiple transmission antennas have been used to transmit a RACH burst signal to the base station, newly setting a transmission power higher than the previously set transmission power, and then, returning to the step (a).