Method and device in nodes used for wireless communication

A second node for wireless communications, comprising:

• a second transmitter, transmitting a first signaling, the first signaling being a DCI, the first signaling indicating scheduling information of a first signal;
• and
• a second receiver, receiving the first signal, the first signal being transmitted in a PUSCH;
• wherein the first signal comprises a first sub-signal and a second sub-signal;
• the first signaling comprises a first field and a second field;
• the first field of the first signaling and the second field of the first signaling are respectively used to determine antenna port(s) for transmitting the first sub-signal and antenna port(s) for transmitting the second sub-signal;
• the first field indicates at least one SRI, and the second field indicates at least one SRI;
• the first field and the second field each comprise at least one bit, a bitwidth of the second field of the first signaling is related to K1 candidate integers, K1 being a positive integer greater than 1;
• the K1 candidate integers respectively correspond to K1 numbers of layers;
• a relationship between the bitwidth of the second field of the first signaling and the K1 candidate integers is related to whether a time-domain resource occupied by the first sub-signal overlaps with a time-domain resource occupied by the second sub-signal;
• when the time-domain resource occupied by the first sub-signal overlaps with the time-domain resource occupied by the second sub-signal, the bitwidth of the second field of the first signaling is no less than a logarithm of a sum of the K1 candidate integers with base 2;
• when the time-domain resource occupied by the first sub-signal and the time-domain resource occupied by the second sub-signal are mutually orthogonal, the bitwidth of the second field of the first signaling is no less than a logarithm of a greatest value of the K1 candidate integers with base 2.

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

• receiving a first signaling, the first signaling being a DCI, the first signaling indicating scheduling information of a first signal;
• and
• transmitting the first signal, the first signal being transmitted in a PUSCH;
• wherein the first signal comprises a first sub-signal and a second sub-signal;
• the first signaling comprises a first field and a second field;
• the first field of the first signaling and the second field of the first signaling are respectively used to determine antenna port(s) for transmitting the first sub-signal and antenna port(s) for transmitting the second sub-signal;
• the first field indicates at least one SRI, and the second field indicates at least one SRI;
• the first field and the second field each comprise at least one bit, a bitwidth of the second field of the first signaling is related to K1 candidate integers, K1 being a positive integer greater than 1;
• the K1 candidate integers respectively correspond to K1 numbers of layers;
• a relationship between the bitwidth of the second field of the first signaling and the K1 candidate integers is related to whether a time-domain resource occupied by the first sub-signal overlaps with a time-domain resource occupied by the second sub-signal;
• when the time-domain resource occupied by the first sub-signal overlaps with the time-domain resource occupied by the second sub-signal, the bitwidth of the second field of the first signaling is no less than a logarithm of a sum of the K1 candidate integers with base 2;
• when the time-domain resource occupied by the first sub-signal and the time-domain resource occupied by the second sub-signal are mutually orthogonal, the bitwidth of the second field of the first signaling is no less than a logarithm of a greatest value of the K1 candidate integers with base 2.

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

• transmitting a first signaling, the first signaling being a DCI, the first signaling indicating scheduling information of a first signal;
• and
• receiving the first signal, the first signal being transmitted in a PUSCH;
• wherein the first signal comprises a first sub-signal and a second sub-signal;
• the first signaling comprises a first field and a second field;
• the first field of the first signaling and the second field of the first signaling are respectively used to determine antenna port(s) for transmitting the first sub-signal and antenna port(s) for transmitting the second sub-signal;
• the first field indicates at least one SRI, and the second field indicates at least one SRI;
• the first field and the second field each comprise at least one bit, a bitwidth of the second field of the first signaling is related to K1 candidate integers, K1 being a positive integer greater than 1;
• the K1 candidate integers respectively correspond to K1 numbers of layers;
• a relationship between the bitwidth of the second field of the first signaling and the K1 candidate integers is related to whether a time-domain resource occupied by the first sub-signal overlaps with a time-domain resource occupied by the second sub-signal;
• when the time-domain resource occupied by the first sub-signal overlaps with the time-domain resource occupied by the second sub-signal, the bitwidth of the second field of the first signaling is no less than a logarithm of a sum of the K1 candidate integers with base 2;
• when the time-domain resource occupied by the first sub-signal and the time-domain resource occupied by the second sub-signal are mutually orthogonal, the bitwidth of the second field of the first signaling is no less than a logarithm of a greatest value of the K1 candidate integers with base 2.