Method and device in communication node for wireless communication

A method in a second-type communication node for wireless communication, comprising:

• transmitting first information;
• and
• receiving a first radio signal;
• wherein the first information is used to determine K candidate time-instant subsets, each candidate time-instant subset of the K candidate time-instant subsets comprises a positive integer number of candidate time-instant(s), the K is a positive integer greater than 1;
• a target time-instant subset is one of the K candidate time-instant subsets, a starting time-instant of transmitting the first radio signal is a first time-instant, the first time-instant belongs to the target time-instant subset;
• a frequency-domain bandwidth of a first sub-band is used to determine the target time-instant subset out of the K candidate time-instant subsets, frequency-domain resources occupied by the first radio signal belong to the first sub-band;
• the first information is transmitted through an air interface;
• and the first radio signal successively occupies a part of a multi-carrier symbol and a positive integer number of complete multi-carrier symbol(s) in the time domain, and a signal transmitted in the part of the multi-carrier symbol occupied by the first radio signal is a cyclic extension of a signal transmitted in an earliest complete multi-carrier symbol occupied by the first radio signal;
• the first threshold is in a unit of dBm, the first threshold is related to the bandwidth of the first sub-band.

A first-type communication node device for wireless communication, comprising:

• a first receiver, to receive first information;
• a second receiver, to perform Q energy detections respectively in Q time sub-pools within a first sub-band, wherein the Q is a positive integer greater than 1;
• and
• a first transmitter, if energy detected by each energy detection of the Q energy detections is lower than a first threshold, to start to transmit a first radio signal at a first time-instant;
• wherein the first information is used to determine K candidate time-instant subsets, each candidate time-instant subset of the K candidate time-instant subsets comprises a positive integer number of candidate time-instant(s), the K is a positive integer greater than 1;
• a target time-instant subset is one of the K candidate time-instant subsets, the first time-instant belongs to the target time-instant subset;
• a frequency-domain bandwidth of the first sub-band is used to determine the target time-instant subset out of the K candidate time-instant subsets, the frequency-domain resources occupied by the first radio signal belong to the first sub-band;
• the first information is transmitted through an air interface;
• and the first radio signal successively occupies a part of a multi-carrier symbol and a positive integer number of complete multi-carrier symbol(s) in the time domain, and a signal transmitted in the part of the multi-carrier symbol occupied by the first radio signal is a cyclic extension of a signal transmitted in an earliest complete multi-carrier symbol occupied by the first radio signal;
• the first threshold is in a unit of dBm, the first threshold is related to the bandwidth of the first sub-band.

A second-type communication node device for wireless communication, comprising:

• a second transmitter, to transmit first information;
• and
• a third receiver, to receive a first radio signal;
• wherein the first information is used to determine K candidate time-instant subsets, each candidate time-instant subset of the K candidate time-instant subsets comprises a positive integer number of candidate time-instant(s), the K is a positive integer greater than 1;
• a target time-instant subset is one of the K candidate time-instant subsets, a starting time-instant of transmitting the first radio signal is a first time-instant, the first time-instant belongs to the target time-instant subset;
• a frequency-domain bandwidth of a first sub-band is used to determine the target time-instant subset out of the K candidate time-instant subsets, frequency-domain resources occupied by the first radio signal belong to the first sub-band;
• the first information is transmitted through an air interface;
• and the first radio signal successively occupies a part of a multi-carrier symbol and a positive integer number of complete multi-carrier symbol(s) in the time domain, and a signal transmitted in the part of the multi-carrier symbol occupied by the first radio signal is a cyclic extension of a signal transmitted in an earliest complete multi-carrier symbol occupied by the first radio signal;
• the first threshold is in a unit of dBm, the first threshold is related to the bandwidth of the first sub-band.