Method and apparatus for determining feedback resource in NR V2X

A first device adapted to perform wireless communication, the first device comprising:

• at least one transceiver;
• at least one processor;
• and
• at least one memory storing instructions that, based on being executed by the at least one processor, control the first device to perform operations comprising:
• obtaining a set of physical resource blocks (PRBs) in a resource pool for physical sidelink feedback channel (PSFCH) transmission;
• allocating, for a number of sub-channels for the resource pool and a number of physical sidelink shared channel (PSSCH) slots related to a PSFCH slot, M PRBs including m-th to n-th PRBs from the set of PRBs to an i-th slot among the PSSCH slots related to the PSFCH slot and a j-th sub-channel,
• wherein m and n are obtained based on:
• m=(i+j·N)·M
• n=(i+1+j·N)·M−1
• wherein N is a PSFCH period, M is a positive integer, i is an integer greater than or equal to zero and less than N, and j is an integer greater than or equal to zero and less than the number of sub-channels for the resource pool;
• receiving, based on a slot and at least one sub-channel, a PSSCH from a second device;
• determining, based on the allocation related to the PSSCH, a number of PSFCH resources available for multiplexing hybrid automatic repeat request (HARQ)-acknowledgement (ACK) information in the PSFCH transmission;
• and
• determining, among the PSFCH resources, an index of a PSFCH resource for the PSFCH transmission in response to the reception of the PSSCH, based on a source identifier (ID) of the second device.

At least one memory storing instructions that, based on being executed by at least one processor, control a first device to perform operations for wireless communications, the operations comprising:

• obtaining a set of physical resource blocks (PRBs) in a resource pool for physical sidelink feedback channel (PSFCH) transmission;
• allocating, for a number of sub-channels for the resource pool and a number of physical sidelink shared channel (PSSCH) slots related to a PSFCH slot, M PRBs including m-th to n-th PRBs from the set of PRBs to an i-th slot among the PSSCH slots related to the PSFCH slot and a j-th sub-channel,
• wherein m and n are obtained based on:
• m=(i+j·N)·M
• n=(i+1+j·N)·M−1
• wherein N is a PSFCH period, M is a positive integer, i is an integer greater than or equal to zero and less than N, and j is an integer greater than or equal to zero and less than the number of sub-channels for the resource pool;
• receiving, based on a slot and at least one sub-channel, a PSSCH from a second device;
• determining, based on the allocation related to the PSSCH, a number of PSSCH resources available for multiplexing hybrid automatic repeat request (HARQ)-acknowledgement (ACK) information in the PSFCH transmission;
• and
• determining, among the PSFCH resources, an index of a PSFCH resource for the PSFCH transmission in response to the reception of the PSSCH, based on a source identifier (ID) of the second device.