WIRELESS COMMUNICATION METHOD AND USER EQUIPMENT FOR UL PRACH TRANSMISSION

1 . A wireless communication method performed by a User Equipment (UE) for an uplink (UL) Physical Random Access Channel (PRACH) transmission, the wireless communication method comprising:

receiving a Downlink Control Information (DCI) from a network (NW); and

performing the UL PRACH transmission to the NW in response of receiving the DCI,

wherein the DCI indicates a Physical Downlink Control Channel (PDCCH) order, and the PDCCH order is associated with a scheduling offset from the NW for the UE performing the UL PRACH transmission.

2 . The wireless communication method according to claim 1 , further comprising:

determining an PRACH occasion being valid; and

performing the PRACH transmission in response of determining the PRACH occasion being valid,

wherein the scheduling offset indicates a processing delay of the UE.

3 . The wireless communication method according to claim 2 , wherein the processing delay of the UE is a period between a last symbol of reception of the PDCCH order and a first symbol of the PRACH transmission.

4 . The wireless communication method according to claim 1 , further comprising:

determining at least one of a Timing Advance (TA) value and a UL doppler shift for a Radon Access (RA) procedure corresponding to the PRACH transmission,

wherein the RA procedure is triggered based on a DCI format of the DCI.

5 . The wireless communication method according to claim 7 , wherein the NW is an Non-Terrestrial Network (NTN).

6 . A User Equipment (UE) in a wireless communication system for an uplink (UL) Physical Random Access Channel (PRACH) transmission, the UE comprising:

a processor; and

a memory coupled to the processor, wherein the memory stores a computer-executable program that when executed by the processor, causes the processor to:

receive a Downlink Control Information (DCI) from a network (NW); and

perform the UL PRACH transmission to the NW in response of receiving the DCI,

wherein the DCI indicates a Physical Downlink Control Channel (PDCCH) order, and the PDCCH order is associated with a scheduling offset from the NW for the UE performing the UL PRACH transmission.

7 . The UE according to claim 6 , wherein the processor when executed by the processor, further causes the processor to:

determine an PRACH occasion being valid; and

perform the PRACH transmission in response of determining the PRACH occasion being valid,

wherein the scheduling offset indicates a processing delay of the UE.

8 . The UE according to claim 7 , wherein the processing delay of the UE is a period between a last symbol of reception of the PDCCH order and a first symbol of the PRACH transmission.

9 . The UE according to claim 6 , wherein the processor when executed by the processor, further causes the processor to:

determine at least one of a Timing Advance (TA) value and a UL doppler shift for a Radon Access (RA) procedure corresponding to the PRACH transmission,

wherein the RA procedure is triggered based on a DCI format of the DCI.

10 . The UE according to claim 6 , wherein the NW is an Non-Terrestrial Network (NTN).