a first receiver, receiving a first signaling, a second signaling and a second radio signal;

a first transmitter, transmitting a first radio signal and first information in a first time-frequency resource set;

wherein the first signaling is used to determine the first time-frequency resource set, and the first signaling comprises a first field, the first field comprised in the first signaling being used to determine a first parameter set out of K1 parameter sets, the first parameter set comprises K2 first-type parameters, and at least one of the K2 first-type parameters is used to determine a first integer, a number of resource elements occupied by the first information in the first time-frequency resource set is equal to the first integer, the first integer being greater than 0; the K1 parameter sets are related to a first condition set; K1 and K2 are positive integers greater than 1, respectively; the second signaling comprises a group of configuration information of the second radio signal, the group of configuration information being comprised of at least one of time-frequency resources occupied, an MCS, a HARQ process ID or a New Data Indicator (NDI); the first information is used to determine whether the second radio signal is correctly received, or the second radio signal is a reference signal and the first information is Channel State Information (CSI) for the reference signal; the first radio signal corresponds to a first type, and the second radio signal corresponds to a second type, the first condition set being comprised of the first type and the second type.