METHOD AND USER EQUIPMENT FOR SMALL DATA TRANSMISSION

1 . A method performed by a User Equipment (UE) for small data transmission, the method comprising:

receiving, from a base station (BS), a configuration indicating a dedicated physical resource;

performing the small data transmission based on the dedicated physical resource; and

receiving, from the BS, an acknowledgement (ACK) indicator indicating a successful reception of the small data transmission by the BS,

wherein the UE is in an inactive state while performing the small data transmission.

2 . The method of claim 1 , wherein the dedicated physical resource is obtained via dedicated signaling or broadcast system information (SI).

3 . The method of claim 1 , wherein the dedicated physical resource corresponds to a random access channel (RACH) occasion (RO), a preamble, or a physical uplink shared channel (PUSCH) occasion (PO).

4 . The method of claim 1 , wherein the dedicated physical resource comprises a pre-configured PUSCH resource, and the UE is in a connected state before receiving the pre-configured PUSCH resource.

5 . (canceled)

6 . The method of claim 1 , wherein the ACK indicator corresponds to a random access response (RAR) or is decoded from a specific UE identifier on a physical downlink control channel (PDCCH).

7 . The method of claim 6 , wherein:

the specific UE identifier comprises one of an inactive-radio network temporary identifier (I-RNTI), a random access-RNTI (RA-RNTI), a cell-RNTI (C-RNTI), or a temporary cell-RNTI (TC-RNTI), and

the RAR comprises a fallbackRAR or a successRAR.

8 . The method of claim 1 , wherein the UE is in the inactive state to perform a two-step random access channel (RACH) procedure, a four-step RACH procedure, or a configured grant (CG) type 1 transmission.

9 . A User Equipment (UE) in a wireless communication system for small data transmission, which comprises a Base Station (BS), the UE comprising:

at least one processor; and

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

receive, from the BS, a configuration indicating a dedicated physical resource;

performing the small data transmission based on the dedicated physical resource; and

receive, from the BS, an acknowledgement (ACK) indicator indicating a successful reception of the small data transmission by the BS,

wherein the UE is in an inactive state while performing the small data transmission.

10 . The UE of claim 9 , wherein the dedicated physical resource is obtained via dedicated signaling or broadcast system information (SI).

11 . The UE of claim 9 , wherein the dedicated physical resource corresponds to a random access channel (RACH) occasion (RO), a preamble, or a physical uplink shared channel (PUSCH) occasion (PO).

12 . The UE of claim 9 , wherein the dedicated physical resource comprises a pre-configured PUSCH resource, and the UE is in a connected state before receiving the pre-configured PUSCH resource.

13 . (canceled)

14 . The UE of claim 9 , wherein the ACK indicator corresponds to a random access response (RAR) or is decoded from a specific UE identifier on a physical downlink control channel (PDCCH).

15 . The UE of claim 14 , wherein:

the specific UE identifier comprises one of an inactive-radio network temporary identifier (I-RNTI), a random access-RNTI (RA-RNTI), a cell-RNTI (C-RNTI), or a temporary cell-RNTI (TC-RNTI), and

the RAR comprises a fallbackRAR or a successRAR.

16 . The UE of claim 9 , wherein the UE is in the inactive state to perform a two-step random access channel (RACH) procedure, a four-step RACH procedure, or a configured grant (CG) type 1 transmission.

17 . The method of claim 1 , further comprising receiving a threshold related to a data volume to determine whether to perform the small data transmission, wherein the threshold is configured by a Radio Resource Control (RRC) message.

18 . The UE of claim 9 , wherein the computer-executable program, when executed by the at least one processor, further causes the UE to receive a threshold related to a data volume to determine whether to perform the small data transmission, wherein the threshold is configured by a Radio Resource Control (RRC) message.