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 for transmitting a random access preamble, comprising:
communication control circuitry, which, in operation:
selects at least one of:
preamble(s) contained in a first Random Access Preamble group;preamble(s) contained in a second Random Access Preamble group; andpreamble(s) contained in a third Random Access Preamble group,wherein, a preamble contained in the first Random Access Preamble group is selected 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 the second Random Access Preamble group is selected 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 is selected 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;generates a preamble from among the preamble(s) when the first Random Access Preamble group is selected;generates a preamble from among the preamble(s) when the second Random Access Preamble group is selected;generates a preamble from among the preamble(s) when the third Random Access Preamble group is selected; andtransmits at least one generated preamble.