Radio transmission device and radio transmission method

摘要

A mobile station includes communication control circuitry that selects a preamble contained in a first Random Access Preamble group when a message size based on data available for transmission does not meet a first condition or when a value calculated based on a reference signal received power of downlink does not meet a second condition, a preamble contained in a second Random Access Preamble group when the message size based on data available for transmission meets the first condition and the value calculated based on the reference signal received power of downlink meets the second condition, and a preamble contained in the third Random Access Preamble group for a handover, independent of the message size based on data available for transmission and the value calculated based on the reference signal received power of downlink. The communication control circuitry also generates and transmits a selected preamble.

主权项

1. A mobile station, comprising:
a storage device, which, in operation, stores a plurality of Random Access Preamble groups including a first Random Access Preamble group, a second Random Access Preamble group, and a third Random Access Preamble group, each of the plurality of Random Access Preamble groups including one or more of preambles; at least one processor, which, in operation:
selects a preamble contained in the first Random Access Preamble group or the second Random Access Preamble group based on at least a potential message size for transmission and a value calculated from a reference signal received power of downlink at a first time; andselects a preamble contained in the third Random Access Preamble group irrespective of a potential message size for transmission and a value calculated from a reference signal received power of downlink at a second time; and a transmitter, which, in operation, transmits the selected preambles.