Method and apparatus for transmitting and receiving data in wireless communication system

1. A method performed by a terminal in a wireless communication system, the method comprising:

receiving a radio resource control (RRC) release message including suspend-configuration information, from a base station;

based on the suspend-configuration information:

resetting a medium access control (MAC);

re-establishing a radio link control (RLC) entity for an signaling radio bearer (SRB) 1;

suspending bearers including at least one data radio bearer (DRB) and at least one SRB, except an SRB 0 ; and

indicating a packet data convergence protocol (PDCP) suspend of the at least one DRB;

to resume an RRC connection, re-establishing a PDCP entity for the SRB 1 , resuming the SRB 1 , and transmitting an RRC resume request message; and

in response to transmitting the RRC resume request message, receiving an RRC resume message through the SRB 1 .

2. The method of claim 1 , further comprising:

based on the receiving of the RRC resume message, re-establishing a PDCP entity of another SRB among the at least one SRB and a PDCP entity of the at least one DRB.

3. The method of claim 1 , further comprising:

based on an indication of the PDCP suspend, setting a transmission state variable to an initial value and discarding stored PDCP protocol data units (PDUs) at a transmitting PDCP entity of the terminal.

4. The method of claim 1 , further comprising:

based on an indication of the PDCP suspend, stopping and resetting a running reorder timer at a receiving PDCP entity of the terminal.

5. The method of claim 1 , further comprising:

based on an indication of the PDCP suspend, setting at least one reception state variable to an initial value at a receiving PDCP entity of the terminal.

6. The method of claim 1 , further comprising:

based on the suspend-configuration information, entering an RRC inactive mode.

7. A method performed by a base station in a wireless communication system, the method comprising:

transmitting, to a terminal, a radio resource control (RRC) release message including suspend-configuration information, wherein, based on the suspend-configuration information: a medium access control (MAC) is reset at the terminal, a radio link control (RLC) entity for an signaling radio bearer (SRB) 1 is re-established at the terminal, bearers including at least one data radio bearer (DRB) and at least one SRB, except an SRB 0 are suspended at the terminal, and a packet data convergence protocol (PDCP) suspend of the at least one DRB is indicated at the terminal;

receiving an RRC resume request message from the terminal, wherein the terminal re-establishes a PDCP entity for the SRB 1 and resumes the SRB 1 to resume an RRC connection; and

in response to receiving the RRC resume request message, transmitting an RRC resume message through the SRB 1 .

8. The method of claim 7 , wherein, based on the transmitting of the RRC resume message, a PDCP entity of another SRB among the at least one SRB and a PDCP entity of the at least one DRB are re-established at the terminal.

9. The method of claim 7 , further comprising:

based on an indication of the PDCP suspend at the terminal, a transmission state variable is set to an initial value at a transmitting PDCP entity of the terminal.

10. A terminal in a wireless communication system, the terminal comprising:

a transceiver; and

at least one processor coupled with the transceiver and configured to:

receive a radio resource control (RRC) release message including suspend-configuration information, from a base station;

based on the suspend-configuration information:

reset a medium access control (MAC);

re-establish a radio link control (RLC) entity for an signaling radio bearer (SRB) 1 ;

suspend bearers including at least one data radio bearer (DRB) and at least one SRB, except an SRB 0 ; and

indicate a packet data convergence protocol (PDCP) suspend of the at least one DRB;

to resume an RRC connection, re-establish a PDCP entity for the SRB 1 , resume the SRB 1 , and transmit an RRC resume request message; and

in response to the RRC resume request message, receive an RRC resume message through the SRB 1 .

11. The terminal of claim 10 , wherein the at least one processor is further configured to:

based on the receiving of the RRC resume message, re-establish a PDCP entity of another SRB among the at least one SRB and a PDCP entity of the at least one DRB.

12. The terminal of claim 10 , wherein the at least one processor is further configured to:

based on an indication of the PDCP suspend, set a transmission state variable to an initial value and discard stored PDCP protocol data units (PDUs) at a transmitting PDCP entity of the terminal.

13. The terminal of claim 10 , wherein the at least one processor is further configured to:

based on an indication of the PDCP suspend, stop and reset a running reorder timer at a receiving PDCP entity of the terminal.

14. The terminal of claim 10 , wherein the at least one processor is further configured to:

based on an indication of the PDCP suspend, set at least one reception state variable to an initial value at a receiving PDCP entity of the terminal.

15. The terminal of claim 10 , wherein the at least one processor is further configured to:

based on the suspend-configuration information, enter an RRC inactive mode.

16. A base station in a wireless communication system, the base station comprising:

a transceiver; and

at least one processor coupled with the transceiver and configured to:

transmit, to a terminal, a radio resource control (RRC) release message including suspend-configuration information, wherein, based on the suspend-configuration information: a medium access control (MAC) is reset at the terminal, a radio link control (RLC) entity for an signaling radio bearer (SRB) 1 is re-established at the terminal, bearers including at least one data radio bearer (DRB) and at least one SRB, except an SRB 0 are suspended at the terminal, and a packet data convergence protocol (PDCP) suspend of the at least one DRB is indicated at the terminal;

receive an RRC resume request message from the terminal, wherein the terminal re-establishes a PDCP entity for the SRB 1 and resumes the SRB 1 to resume an RRC connection; and

in response to the RRC resume request message, transmit an RRC resume message through the SRB 1 .

17. The base station of claim 16 , wherein based on the transmitting of the RRC resume message, a PDCP entity of another SRB among the at least one SRB and a PDCP entity of the at least one DRB are re-established at the terminal.

18. The base station of claim 16 , wherein the at least one processor is further configured to:

based on an indication of the PDCP suspend at the terminal, a transmission state variable is set to an initial value at a transmitting PDCP entity of the terminal.