User equipment and preamble transmission method

A preamble transmission method, comprising the steps of:

• receiving a synchronization signal and a broadcast channel in a synchronization signal block set from a base station;
• selecting a resource for transmitting a preamble from random access channel resources according to the received synchronization signal and the received broadcast channel;
• and
• transmitting the preamble on the selected resource to the base station;
• wherein a mapping period for mapping the synchronization signal and the broadcast channel to the random access channel resources is a duration in which a process of mapping synchronization signals and broadcast channels transmitted from the base station in the synchronization signal block set to the random access channel resources can be completed, the duration being a value that is based on a multiple of a period of arranging the random access channel resources determined based on configuration information regarding a random access channel.

A base station comprising:

• a transmitter that transmits a synchronization signal and a broadcast channel in a synchronization signal block set;
• and
• a receiver that receives a preamble transmitted according to the synchronization signal and the broadcast channel on a resource selected from random access channel resources;
• wherein a mapping period for mapping the synchronization signal and the broadcast channel to the random access channel resources is a duration in which a process of mapping synchronization signals and broadcast channels transmitted from the base station in the synchronization signal block set to the random access channel resources can be completed, the duration being a value that is based on a multiple of a period of arranging the random access channel resources determined based on configuration information regarding a random access channel.

A communication system comprising a terminal and a base station:

• wherein the base station comprises:
• a first transmitter that transmits a synchronization signal and a broadcast channel in a synchronization signal block set;
• wherein the terminal comprises:
• a receiver that receives the synchronization signal and the broadcast channel in the synchronization signal block set from the base station;
• a processor that selects a resource for transmitting a preamble from random access channel resources according to the received synchronization signal and the received broadcast channel;
• and
• a second transmitter that transmits the preamble on the selected resource to the base station;
• wherein the processor uses, as a mapping period for mapping the synchronization signal and the broadcast channel to the random access channel resources, a duration in which a process of mapping synchronization signals and broadcast channels transmitted from the base station in the synchronization signal block set to the random access channel resources can be completed, the duration being a value that is based on a multiple of a period of arranging the random access channel resources determined based on configuration information regarding a random access channel.