| CPC H04W 72/02 (2013.01) [H04W 72/0446 (2013.01); H04W 72/0453 (2013.01); H04W 72/1263 (2013.01)] | 15 Claims |

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1. A first node for wireless communications, comprising:
a first receiver, receiving a first signaling and a first signal in a first time-frequency resource block; and
a first transmitter, transmitting a second information block in a first radio resource block;
wherein the first signaling comprises scheduling information for the first signal; the first signaling and the first signal belong to a same slot in a time domain; the first signal carries a first bit block set; the second information block indicates whether the first bit block set is correctly received; the first radio resource block is a radio resource block in a first radio resource block group; the first time-frequency resource block comprises a first time-frequency unit; a first time-frequency unit group comprises the first time-frequency unit and at least one time-frequency unit other than the first time-frequency unit, any two time-frequency units in the first time-frequency unit group are orthogonal in the time domain; each time-frequency unit comprises a slot in the time domain; the first signal does not occupy time-frequency resources within any time-frequency unit in the first time-frequency unit group other than the first time-frequency unit; the first time-frequency unit group is used to determine the first radio resource block group; the first time-frequency unit group is a candidate time-frequency unit group of P4 candidate time-frequency unit groups, where P4 is a positive integer greater than 1; any of the P4 candidate time-frequency unit groups comprises a positive integer number of the time-frequency unit(s); the first radio resource block group is a candidate radio resource block group of P3 candidate radio resource block groups, where P3 is a positive integer greater than 1; any of the P4 candidate time-frequency unit groups corresponds to one of the P3 candidate radio resource block groups, the first radio resource block group being a candidate radio resource block group corresponding to the first time-frequency unit group among the P3 candidate radio resource block groups; correspondence relationships between the P4 candidate time-frequency unit groups and the P3 candidate radio resource block groups are configured by a higher layer signaling, wherein (i) the first time-frequency unit group is a candidate time-frequency unit group of K1 candidate time-frequency unit groups, K1 being a positive integer greater than 1; any candidate time-frequency unit group among the K1 candidate time-frequency unit groups comprises the first time-frequency unit, or (ii) the first time-frequency unit group is a candidate time-frequency unit group of Q1 candidate time-frequency unit groups, Q1 being a positive integer greater than 1, only the first time-frequency unit group among the Q1 candidate time-frequency unit groups comprises the first time-frequency unit; the Q1 candidate time-frequency unit groups are determined by the higher-layer signaling.
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