Patent ID: 8681763

Claim:
A mobile station for transmitting a random access preamble, comprising: an integrated circuitry including one or more processing devices configured to: determine, based on information broadcasted from a base station, one or more first preambles contained in a first Random Access Preamble group and any second preamble(s) contained in a second Random Access Preamble group; select the second Random Access Preamble group if a message size based on data available for transmission meets a first condition and if a value calculated based on a reference signal received power of downlink meets a second condition, and else selects the first Random Access Preamble group; and randomly selects randomly select a preamble from among the first preamble(s) when the first Random Access Preamble group is selected, or randomly selects a preamble from among the second preamble(s) when the second Random Access Preamble group is selected; and a random access preamble transmitter that transmits the selected preamble.