Wireless communication device and wireless communication method for mapping reference signals to shortened transmission time intervals

An integrated circuit comprising:

• reception circuitry, which, in operation, controls receiving data mapped to at least one symbol in 14 consecutive symbols, which are comprised of at least a first shortened transmission time interval (TTI), a second shortened TTI, a third shortened TTI, a fourth shortened TTI and a fifth shortened TTI,
• wherein the first shortened TTI, the second shortened TTI and the third shortened TTI have resources used for a reference signal (RS), and the fourth shortened TTI and the fifth shortened TTI have no resource used for the RS;
• and
• demodulation circuitry, which, in operation, controls demodulating at least the data,
• wherein the resources used for the RS of the first shortened TTI, the second shortened TTI and the third shortened TTI are non-consecutive in symbols of the 14 consecutive symbols,
• wherein a first number of shortened TTIs having no RS between the first shortened TTI and the second shortened TTI is different from a second number of shortened TTIs having no RS between the second shortened TTI and the third shortened TTI, and
• wherein a difference between the first number and the second number is one.