Method and device in nodes used for wireless communication

A second node for wireless communications, comprising:

• a second transceiver, which transmits a first information block and receives a second information block, the first information block being used to indicate a scheduled cell set, the scheduled cell set comprising more than one serving cell, the scheduled cell set comprises a first scheduled cell subset, the first scheduled cell subset comprising a positive integer number of serving cell(s), and any serving cell comprised by the first scheduled cell subset belonging to the scheduled cell set;
• a first transmitter, which determines M1 control channel candidates in a first time window, the M1 control channel candidates occupying M2 control channel elements, M1 being a positive integer greater than 1, and M2 being a positive integer greater than 1, and the first time window comprising a positive integer number of time-domain consecutive multicarrier symbols;
• wherein a first scheduling cell subset comprises scheduling cell(s) of serving cell(s) comprised by the first scheduled cell subset, and the M1 control channel candidates are monitored in serving cell(s) comprised by the first scheduling cell subset, the first scheduling cell subset comprising a positive integer number of serving cell(s);
• the second information block is used to indicate a combination employed by the serving cell(s) comprised by the first scheduling cell subset, and the combination employed by the serving cell(s) comprised by the first scheduling cell subset comprises two positive integers;
• a subcarrier spacing (SCS) of subcarriers occupied by one of the M2 control channel elements in frequency domain is equal to a first SCS, and the first SCS is used to determine a time length of a multicarrier symbol comprised by the first time window, and the combination employed by the serving cell(s) comprised by the first scheduling cell subset is used to determine a number of multicarrier symbols comprised by the first time window;
• M1 is no greater than a first threshold, M2 is no greater than a second threshold, and both the first threshold and the second threshold are positive integers;
• a number of serving cell(s) comprised by the first scheduled cell subset and a number of serving cells comprised by the scheduled cell set are jointly used to determine the first threshold and the second threshold.

A method in a first node for wireless communications, comprising:

• receiving a first information block and transmitting a second information block, the first information block being used to determine a scheduled cell set, the scheduled cell set comprising more than one serving cell, the scheduled cell set comprises a first scheduled cell subset, the first scheduled cell subset comprising a positive integer number of serving cell(s), and any serving cell comprised by the first scheduled cell subset belonging to the scheduled cell set;
• monitoring M1 control channel candidates in a first time window, the M1 control channel candidates occupying M2 control channel elements, M1 being a positive integer greater than 1, and M2 being a positive integer greater than 1, and the first time window comprising a positive integer number of time-domain consecutive multicarrier symbols;
• wherein a first scheduling cell subset comprises scheduling cell(s) of serving cell(s) comprised by the first scheduled cell subset, and the M1 control channel candidates are monitored in serving cell(s) comprised by the first scheduling cell subset, the first scheduling cell subset comprising a positive integer number of serving cell(s);
• the second information block is used to indicate a combination employed by the serving cell(s) comprised by the first scheduling cell subset, and the combination employed by the serving cell(s) comprised by the first scheduling cell subset comprises two positive integers;
• a subcarrier spacing (SCS) of subcarriers occupied by one of the M2 control channel elements in frequency domain is equal to a first SCS, and the first SCS is used to determine a time length of a multicarrier symbol comprised by the first time window, and the combination employed by the serving cell(s) comprised by the first scheduling cell subset is used to determine a number of multicarrier symbols comprised by the first time window;
• M1 is no greater than a first threshold, M2 is no greater than a second threshold, and both the first threshold and the second threshold are positive integers;
• a number of serving cell(s) comprised by the first scheduled cell subset and a number of serving cells comprised by the scheduled cell set are jointly used to determine the first threshold and the second threshold.