Method and apparatus to allocate harq process dynamically for uplink transmission in wireless communication system

A user equipment (UE) in a wireless communication system, the UE comprising:

• at least one transceiver;
• at least one processor;
• and
• at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:
• receiving a uplink (UL) grant associated with a first Hybrid Automatic Repeat Request (HARQ) process from a gNB;
• selecting a second HARQ process among the first HARQ process and the second HARQ process, based on there being a first medium access control (MAC) protocol data unit (PDU) which is associated with the first HARQ process and is a pending MAC PDU;
• generating a second MAC PDU associated with the second HARQ process;
• and
• performing an uplink transmission of the second MAC PDU with an identifier (ID) of the second HARQ process.

An apparatus for a user equipment (UE), the apparatus comprising:

• at least one processor;
• and
• at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:
• receiving a uplink (UL) grant associated with a first Hybrid Automatic Repeat Request (HARQ) process from a gNB;
• selecting a second HARQ process among the first HARQ process and the second HARQ process, based on there being a first medium access control (MAC) protocol data unit (PDU) which is associated with the first HARQ process and is a pending MAC PDU;
• generating a second MAC PDU associated with the second HARQ process;
• and
• performing an uplink transmission of the second MAC PDU with an identifier (ID) of the second HARQ process.

A computer readable storage medium storing at least one computer program comprising instructions that, when executed by at least one processor, cause the at least one processor to perform operations for a user equipment (UE), the operations comprising:

• receiving a uplink (UL) grant associated with a first Hybrid Automatic Repeat Request (HARQ) process from a gNB;
• selecting a second HARQ process among the first HARQ process and the second HARQ process, based on there being a first medium access control (MAC) protocol data unit (PDU) which is associated with the first HARQ process and is a pending MAC PDU;
• generating a second MAC PDU associated with the second HARQ process;
• and
• performing an uplink transmission of the second MAC PDU with an identifier (ID) of the second HARQ process.