Method and device for reserving resource in NR V2X

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

• one or more transceivers;
• and
• one or more processors connected to the one or more transceivers;
• and
• one or more memories connected to the one or more processors and storing instructions that, when executed by the one or more processors, control the first device to perform operations comprising:
• receiving, from a second device, in a slot, a first sidelink control information (SCI) including information related to a resource reservation period;
• determining a size of a selection window based on a remaining packet delay budget;
• obtaining a value of N which is equal to a result of applying a CEILING function to a value obtained by dividing the size of the selection window by the resource reservation period;
• determining that resources are reserved by the second device in N slots located after the slot in which the first SCI is received;
• and
• selecting a resource for SL communication within the selection window, based on the determination,
• wherein the N is a positive integer.

A processing device adapted to control a first device, the processing device comprising:

• one or more processors;
• and
• one or more memories connected to the one or more processors and storing instructions that, when executed by the one or more processors, control the first device to perform operations comprising:
• receiving, from a second device, in a slot, a first sidelink control information (SCI) including information related to a resource reservation period;
• determining a size of a selection window based on a remaining packet delay budget;
• obtaining a value of N which is equal to a result of applying a CEILING function to a value obtained by dividing the size of the selection window by the resource reservation period;
• determining that resources are reserved by the second device in N slots located after the slot in which the first SCI is received;
• and
• selecting a resource for SL communication within the selection window, based on the determination,
• wherein the N is a positive integer.