Method and apparatus for communication in wireless mobile communication system

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

receiving a first radio resource control (RRC) connection release message for transitioning into an RRC inactive state, the first RRC connection release message including a resume identity and a next hop chaining count;

in case that uplink data occurs in the RRC inactive state, transmitting, to a base station, a random access preamble;

receiving, from the base station, a random access response including timing alignment information and an uplink grant;

transmitting, to the base station, a single medium access control (MAC) protocol data unit (PDU) including the uplink data and an RRC connection resume request message, the RRC connection resume request message including the resume identity; and

receiving, from the base station, a second RRC connection release message as a response to the RRC connection resume request message,

wherein the random access preamble is selected from a preamble group for transmitting the uplink data associated with a data radio bearer (DRB).

2. The method of claim 1 ,

wherein a threshold for the uplink data is obtained based on system information, and

wherein the random access preamble associated with the uplink data is transmitted in case that a size of the uplink data is less than or equal to the threshold.

3. The method of claim 1 ,

wherein the uplink data associated with the DRB is multiplexed with the RRC connection resume request message associated with a signaling radio bearer (SRB) in the single MAC PDU.

4. The method of claim 1 ,

wherein a key is derived based on the next hop chaining count included in the first RRC connection release message, and

wherein the uplink data is ciphered based on the key.

5. The method of claim 1 ,

wherein the RRC connection resume request message includes a short message authentication code-integrity (MAC-I), and

wherein the uplink data is transmitted to the base station with no transition to an RRC connected state from the RRC inactive state.

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

receiving, from a terminal, a random access preamble associated with uplink data for the terminal, the terminal being in a radio resource control (RRC) inactive state based on a first RRC connection release message including a resume identity and a next hop chaining count;

transmitting, to the terminal, a random access response including timing alignment information and an uplink grant;

receiving, from the terminal, a single medium access control (MAC) protocol data unit (PDU) including the uplink data and an RRC connection resume request message, the RRC connection resume request message including the resume identity; and

transmitting, to the terminal, a second RRC connection release message as a response to the RRC connection resume request message,

wherein the random access preamble is selected from a preamble group for transmitting the uplink data associated with a data radio bearer (DRB).

7. The method of claim 6 ,

wherein a threshold for the uplink data is obtained based on system information, and

wherein the random access preamble associated with the uplink data is transmitted in case that a size of the uplink data is less than or equal to the threshold.

8. The method of claim 6 ,

wherein the uplink data associated with the DRB is multiplexed with the RRC connection resume request message associated with a signaling radio bearer (SRB) in the single MAC PDU.

9. The method of claim 6 ,

wherein a key is derived based on the next hop chaining count included in the first RRC connection release message, and

wherein the uplink data is ciphered based on the key.

10. The method of claim 6 ,

wherein the RRC connection resume request message includes short message authentication code-integrity (MAC-I), and

wherein the uplink data is transmitted to the base station with no transition to an RRC connected state from the RRC inactive state.

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

a transceiver; and

a controller configured to:

receive, via the transceiver, a first radio resource control (RRC) connection release message for transitioning into an RRC inactive state, the first RRC connection release message including a resume identity and a next hop chaining count,

in case that uplink data occurs in the RRC inactive state, transmit, to a base station via the transceiver, a random access preamble,

receive, from the base station via the transceiver, a random access response including timing alignment information and an uplink grant,

transmit, to the base station via the transceiver, a single medium access control (MAC) protocol data unit (PDU) including the uplink data and an RRC connection resume request message, the RRC connection resume request message including the resume identity, and

receive, from the base station via the transceiver, a second RRC connection release message as a response to the RRC connection resume request message,

wherein the random access preamble is selected from a preamble group for transmitting the uplink data associated with a data radio bearer (DRB).

12. The terminal of claim 11 ,

wherein a threshold for the uplink data is obtained based on system information, and

wherein the random access preamble associated with the uplink data is transmitted in case that a size of the uplink data is less than or equal to the threshold.

13. The terminal of claim 11 ,

wherein the uplink data associated with the DRB is multiplexed with the RRC connection resume request message associated with a signaling radio bearer (SRB) in the single MAC PDU.

14. The terminal of claim 11 ,

wherein a key is derived based on the next hop chaining count included in the first RRC connection release message, and

wherein the uplink data is ciphered based on the key.

15. The terminal of claim 11 ,

wherein the RRC connection resume request message includes a short message authentication code-integrity (MAC-I), and

wherein the uplink data is transmitted to the base station with no transition to an RRC connected state from the RRC inactive state.

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

a transceiver; and

a controller configured to:

receive, from a terminal via the transceiver, a random access preamble associated with uplink data for the terminal, the terminal being in a radio resource control (RRC) inactive state based on a first RRC connection release message including a resume identity and a next hop chaining count,

transmit, to the terminal via the transceiver, a random access response including timing alignment information and an uplink grant,

receive, from the terminal via the transceiver, a single medium access control (MAC) protocol data unit (PDU) including the uplink data and an RRC connection resume request message, the RRC connection resume request message including the resume identity, and

transmit, to the terminal via the transceiver, a second RRC connection release message as a response to the RRC connection resume request message,

wherein the random access preamble is selected from a preamble group for transmitting the uplink data associated with a data radio bearer (DRB).

17. The base station of claim 16 ,

wherein a threshold for the uplink data is obtained based on system information, and

wherein the random access preamble associated with the uplink data is transmitted in case that a size of the uplink data is less than or equal to the threshold.

18. The base station of claim 16 ,

wherein the uplink data associated with the DRB is multiplexed with the RRC connection resume request message associated with a signaling radio bearer (SRB) in the single MAC PDU.

19. The base station of claim 16 ,

wherein a key is derived based on the next hop chaining count included in the first RRC connection release message, and

wherein the uplink data is ciphered based on the key.

20. The base station of claim 16 ,

wherein the RRC connection resume request message includes short message authentication code-integrity (MAC-I), and

wherein the uplink data is transmitted to the base station with no transition to an RRC connected state from the RRC inactive state.