Transmitter apparatus, receiver apparatus, transmission method, and reception method

A receiver apparatus of a reference signal, comprising:

• a setting section that sets a candidate resource to which a reference signal is mapped, for a transmission side of the reference signal;
• a notification section that notifies of setting information regarding the candidate source in a physical layer;
• and
• a reception section that receives the reference signal in the candidate resource, wherein
• the candidate resource includes a plurality of basic subframe groups disposed at a first interval, and N (where N is a natural number which is equal to or more than 2) constituent subframes forming each basic subframe group are disposed at a second interval shorter than the first interval, and
• each candidate frequency unit of a candidate frequency unit group that forms the candidate resource is a frequency unit which is regulated by a predetermined frequency hopping pattern among M (where M is a natural number which is equal to or more to than 2) frequency units of each constituent subframe.

A transmission method of a reference signal, comprising:

• receiving setting information regarding a candidate resource to which a reference signal is mapped, in a physical layer;
• specifying the candidate resource on the basis of the setting information;
• determining a mapping resource to which a reference signal is mapped on the basis of a trigger signal in a candidate frequency unit group forming the candidate resource;
• and
• mapping a reference signal to the determined mapping resource and transmitting the mapped reference signal, wherein
• the candidate resource includes a plurality of basic subframe groups disposed at a first interval, and N (where N is a natural number which is equal to or more than 2) constituent subframes forming each basic subframe group are disposed at a second interval shorter than the first interval, and
• each candidate frequency unit of the candidate frequency unit group is a frequency unit which is regulated by a predetermined frequency hopping pattern among M (where M is a natural number which is equal to or more than 2) frequency units of each constituent subframe.

A reception method of a reference signal, comprising:

• setting a candidate resource to which a reference signal is mapped, for a transmission side of the reference signal;
• notifying of setting information regarding the candidate resource in a physical layer;
• and
• receiving the reference signal in the candidate resource, wherein
• the candidate resource includes a plurality of basic subframe groups disposed at a first interval, and N (where N is a natural number which is equal to or more than 2) constituent subframes forming each basic subframe group are disposed at a second interval shorter than the first interval, and
• each candidate frequency unit of a candidate frequency unit group that forms the candidate resource is a frequency unit which is regulated by a predetermined frequency hopping pattern among M (where M is a natural number which is equal to or more than 2) frequency units of each constituent subframe.