The base station includes a sequence identifier determining unit which performs scheduling to allocate a frequency based on an uplink channel reception state of the user apparatus, and which determines a second sequence identifier for use by the user apparatus based on a first sequence identifier in a length of {HEAD ~ a reference signal sequence} for transmitting in {TAIL ~ a maximum bandwidth} in which the user apparatus can transmit, and a frequency bandwidth allocated to the user apparatus 
The base station includes a sequence identifier determining unit which performs scheduling to allocate a frequency based on an uplink channel reception state of the user apparatus , and which determines a second sequence identifier for use by the user apparatus based on a first sequence identifier in a length of { HEAD ~ a reference signal sequence } for transmitting in { TAIL ~ a maximum bandwidth } in which the user apparatus can transmit , and a frequency bandwidth allocated to the user apparatus
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