Method and apparatus for performing uplink transmission with pre-allocated beams in wireless communication system

1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising:

receiving a connection release message from a network in a first state, wherein the connection release message includes information on a pre-allocated UL resource for UL transmission with pre-allocated beams;

entering a second state from the first state;

selecting a cell; and

performing the UL transmission to the cell in the second state via the pre-allocated beams based on the pre-configured UL resource for UL transmission when a data is available for transmission.

2. The method of claim 1 , wherein the information on the pre-allocated UL resource is a pre-allocated UL grant configuration, and

wherein the UL transmission is a physical uplink shared channel (PUSCH) transmission of a media access control (MAC) protocol data unit (PDU).

3. The method of claim 2 , wherein a quality of the pre-allocated beams meets a criterion.

4. The method of claim 2 , further comprising performing PUSCH retransmission of the MAC PDU to the cell via the pre-allocated beams based on the pre-allocated UL resource until an acknowledgement is received from the cell and/or a maximum number of retransmission is reached.

5. The method of claim 2 , further comprising performing a random access procedure towards the cell when a quality of the pre-allocated beams does not meet a criterion and/or a timer expires.

6. The method of claim 5 , further comprising starting the timer when the MAC PDU is available for transmission in a UE buffer or when a new PUSCH transmission starts.

7. The method of claim 2 , further comprising considering that transmission of the MAC PDU is successfully completed when an acknowledgement is received from the cell.

8. The method of claim 7 , wherein the acknowledgement is a physical downlink control channel (PDCCH) addressed to a UE-specific radio network temporary identity (RNTI).

9. The method of claim 1 , wherein the information on the pre-allocated UL resource is a pre-allocated sounding reference signal (SRS) configuration, and

wherein the UL transmission is an SRS transmission.

10. The method of claim 9 , wherein the SRS transmission is performed until a PDCCH addressed to a UE-specific RNTI is successfully received.

11. The method of claim 10 , further comprising a MAC PDU to the cell via a PUSCH based on the PDCCH addressed to the UE-specific RNTI, when the PDCCH addressed to the UE-specific RNTI is successfully received.

12. The method of claim 10 , further comprising performing a random access procedure towards the cell, when the PDCCH addressed to the UE-specific RNTI is not successfully received and/or a timer expires and/or a maximum number of SRS transmissions is reached.

13. The method of claim 1 , wherein the first state is a radio resource control (RRC) connected state.

14. The method of claim 1 , wherein the second state is an RRC inactive state and/or an RRC idle state.

15. The method of claim 1 , wherein the UE device is in communication with at least one of a mobile device, a network, and/or autonomous vehicles other than the UE.

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

a memory;

a transceiver; and

a processor, operably coupled to the memory and the transceiver, and configured to:

control the transceiver to receive a connection release message from a network in a first state, wherein the connection release message includes information on a pre-allocated UL resource for UL transmission with pre-allocated beams;

enter a second state from the first state;

select a cell; and

control the transceiver to perform the UL transmission to the cell in the second state via the pre-allocated beams based on the pre-configured UL resource for UL transmission when a data is available for transmission.