User device, base station, signal reception method, and signal transmission method

A base station that communicates with a user device in a narrowband radio communication system using a physical downlink control channel or a physical downlink shared channel that includes multiple resources of a predetermined unit in a time domain, the base station comprising:

• a processor that generates the physical downlink control channel or the physical downlink shared channel in which each of the multiple resources is consecutively repeated a number of times indicated by a predetermined resource number reported to the user device in each repetition unit and is repeated a number of times indicated by a predetermined repetition number in total;
• and
• a transmitter that transmits the generated physical downlink control channel or physical downlink shared channel to the user device,
• wherein a reference signal is mapped to each of the multiple resources constituting the physical downlink control channel or the physical downlink shared channel, and
• the user device performs demodulation by performing channel estimation using the received reference signal.

A signal reception method performed by a user device that communicates with a base station in a narrowband radio communication system using a physical downlink control channel or a physical downlink shared channel that includes multiple resources of a predetermined unit in a time domain, the signal reception method comprising:

• obtaining a repetition number indicating a number of times each of the multiple resources is repeatedly transmitted in the time domain, and information indicating a predetermined resource number;
• receiving, from the base station, the physical downlink control channel or the physical downlink shared channel in which each of the multiple resources is consecutively repeated a number of times indicated by the predetermined resource number in each repetition unit and is repeated a number of times indicated by the repetition number in total;
• mapping a reference signal to each of the multiple resources constituting the physical downlink control channel or the physical downlink shared channel;
• and
• performing demodulation by performing channel estimation using the received reference signal.