User equipment apparatus, base station, and random access method

Abstract

In one aspect of the present invention, a user equipment apparatus includes a reception unit configured to receive, from a base station, control information indicating a pattern of retransmission schemes to be applied depending on a retransmission count, for retransmitting a preamble through random access to the base station, the retransmission schemes including beam switching and power ramping; and a transmission unit configured to transmit the preamble according to the control information at timing of retransmitting the preamble.

1 . A user equipment apparatus, comprising:
 a reception unit configured to receive, from a base station, control information indicating a pattern of retransmission schemes to be applied depending on a retransmission count, for retransmitting a preamble through random access to the base station, the retransmission schemes including beam switching and power ramping; and   a transmission unit configured to transmit the preamble according to the control information at timing of retransmitting the preamble.   
     
     
         2 . The user equipment apparatus as claimed in  claim 1 , wherein
 the transmission unit transmits a terminal aspect to the base station, and   the reception unit receives the control information indicating the pattern of retransmission schemes which is determined based on the terminal aspect.   
     
     
         3 . The user equipment apparatus as claimed in  claim 1 , wherein
 the reception unit receives information about a maximum retransmission count of the preamble from the base station.   
     
     
         4 . A base station, comprising:
 a transmission unit configured to transmit, to a user equipment apparatus, control information indicating a pattern of retransmission schemes to be applied depending on a retransmission count, for the user equipment apparatus to retransmit a preamble through random access, the retransmission schemes including beam switching and power ramping; and   a reception unit configured to receive the preamble transmitted according to the control information.   
     
     
         5 . A random access method in a user equipment apparatus, comprising the steps of:
 receiving, from a base station, control information indicating a pattern of retransmission schemes to be applied depending on a retransmission count, for retransmitting a preamble through random access to the base station, the retransmission schemes including beam switching and power ramping; and   transmitting the preamble according to the control information at timing of retransmitting the preamble.   
     
     
         6 . A random access method in a base station, comprising:
 transmitting, to a user equipment apparatus, control information indicating a pattern of retransmission schemes to be applied depending on a retransmission count, for the user equipment apparatus to retransmit a preamble through random access, the retransmission schemes including beam switching and power ramping; and   receiving the preamble transmitted according to the control information.