Method and device in a node used for wireless communication

A second node for wireless communications, comprising:

• a first transmitter, transmitting a first signaling in a first resource pool, the first resource pool comprising a CORESET or a search space set, and the first signaling comprising DCI;
• and
• a second processor, transmitting a first signal, the first signal being transmitted on a PDSCH:
• wherein the first signaling indicates scheduling information of the first signal, and the scheduling information of the first signal comprises one or more of a time-domain resource occupied, a frequency-domain resource occupied, a MCS, DMRS port(s), a HARQ process number, a RV or a NDI:
• the first resource pool corresponds to a first spatial relation set, a number of spatial relation(s) comprised in the first spatial relation set is equal to either 1 or 2:
• the spatial relation comprises a TCI state or QCL assumption:
• the first signaling does not comprise a first field, the first field indicating a spatial relation corresponding to a signal scheduled by a signaling to which the first field belongs:
• the first signal corresponds to a first spatial relation, and the number of spatial relation(s) comprised in the first spatial relation set is used for determining the first spatial relation:
• when the first spatial relation set comprises K spatial relations and K is equal to 2, the first spatial relation is one of the K spatial relations, and the first spatial relation has a default position among the K spatial relations.

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

• receiving a first signaling in a first resource pool, the first resource pool comprising a CORESET or a search space set, and the first signaling comprising DCI;
• and
• receiving a first signal, the first signal being transmitted on a PDSCH:
• wherein the first signaling indicates scheduling information of the first signal, and the scheduling information of the first signal comprises one or more of a time-domain resource occupied, a frequency-domain resource occupied, a MCS, DMRS port(s), a HARQ process number, a RV or a NDI:
• the first resource pool corresponds to a first spatial relation set, a number of spatial relation(s) comprised in the first spatial relation set is equal to either 1 or 2:
• the spatial relation comprises a TCI state or QCL assumption:
• the first signaling does not comprise a first field, the first field indicating a spatial relation corresponding to a signal scheduled by a signaling to which the first field belongs:
• the first signal corresponds to a first spatial relation, and the number of spatial relation(s) comprised in the first spatial relation set is used for determining the first spatial relation:
• when the first spatial relation set comprises K spatial relations and K is equal to 2, the first spatial relation is one of the K spatial relations, and the first spatial relation has a default position among the K spatial relations.

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

• transmitting a first signaling in a first resource pool, the first resource pool comprising a CORESET or a search space set, and the first signaling comprising DCI;
• and
• transmitting a first signal, the first signal being transmitted on a PDSCH:
• wherein the first signaling indicates scheduling information of the first signal, and the scheduling information of the first signal comprises one or more of a time-domain resource occupied, a frequency-domain resource occupied, a MCS, DMRS port(s), a HARQ process number, a RV or a NDI:
• the first resource pool corresponds to a first spatial relation set, a number of spatial relation(s) comprised in the first spatial relation set is equal to either 1 or 2:
• the spatial relation comprises a TCI state or QCL assumption:
• the first signaling does not comprise a first field, the first field indicating a spatial relation corresponding to a signal scheduled by a signaling to which the first field belongs:
• the first signal corresponds to a first spatial relation, and the number of spatial relation(s) comprised in the first spatial relation set is used for determining the first spatial relation:
• when the first spatial relation set comprises K spatial relations and K is equal to 2, the first spatial relation is one of the K spatial relations, and the first spatial relation has a default position among the K spatial relations.