Transmission device, reception device, transmission method, and reception method

A reception apparatus, comprising:

• reception circuitry, which, in operation, receives a signal of a random access channel;
• and
• control circuitry, which, in operation, determines a preamble sequence from among a plurality of preamble sequence candidates, the preamble sequence being included in the signal, wherein
• at least one of the plurality of preamble sequence candidates is composed of two or more code sequences different from each other.

A transmission method, comprising:

• configuring, from among a plurality of preamble sequence candidates, a preamble sequence used for a signal of a random access channel;
• and
• transmitting the signal of the random access channel, wherein
• at least one of the plurality of preamble sequence candidates is composed of two or more code sequences different from each other.

A reception method, comprising:

• receiving a signal of a random access channel;
• and
• determining, from among a plurality of preamble sequence candidates, a preamble sequence included in the signal, wherein
• at least one of the plurality of preamble sequence candidates is composed of two or more code sequences different from each other.