METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING DATA IN COMMUNICATION SYSTEM

1 . An operation method of a base station in a communication system, the operation method comprising:

generating an indicator indicating transmission of small data;

transmitting the indicator to a terminal; and

transmitting the small data associated with the indicator to the terminal,

wherein the terminal operates in a radio resource control (RRC) idle state or an RRC inactive state.

2 . The operation method according to claim 1 , wherein the indicator is included in downlink control information (DCI) transmitted from the base station to the terminal.

3 . The operation method according to claim 2 , wherein a cyclic redundancy check (CRC) of the DCI including the indicator is scrambled with a paging-radio network temporary identifier (P-RNTI) or a small-RNTI (SM-RNTI) configured for transmission of the small data.

4 . The operation method according to claim 2 , wherein the DCI further includes resource allocation information of the small data.

5 . The operation method according to claim 1 , wherein a transmission window starts at a time of transmitting the indicator, and the small data is transmitted within the transmission window.

6 . The operation method according to claim 1 , further comprising receiving a hybrid automatic repeat request (HARQ) response for the small data from the terminal, wherein the HARQ response is received in a random access (RA) procedure.

7 . The operation method according to claim 6 , wherein the HARQ response is a RA preamble, and a first RA preamble corresponding to acknowledgement (ACK) is configured to be different from a second RA preamble corresponding to negative ACK (NACK).

8 . The operation method according to claim 1 , wherein the small data is transmitted to the terminal on a paging channel (PCH) or a downlink-shared channel (DL-SCH).

9 . The operation method according to claim 1 , wherein a transmission resource of the small data is configured within a bandwidth part (BWP) configured by the base station, and configuration information of the BWP is transmitted from the base station to the terminal.

10 . An operation method of a terminal in a communication system, the operation method comprising:

receiving downlink control information (DCI) from a base station by performing a monitoring operation in a physical downlink control channel (PDCCH) monitoring occasion;

determining that small data to be transmitted to the terminal exists in the base station based on an indicator included in the DCI; and

receiving the small data associated with the indicator from the base station,

wherein the terminal operates in a radio resource control (RRC) idle state or an RRC inactive state.

11 . The operation method according to claim 10 , wherein the monitoring operation is performed using a paging-radio network temporary identifier (P-RNTI) or a small-RNTI (SM-RNTI) configured for transmission of the small data.

12 . The operation method according to claim 10 , wherein the PDCCH monitoring occasion is configured by the base station, and the DCI obtained from the PDCCH monitoring operation further includes resource allocation information of the small data.

13 . The operation method according to claim 10 , wherein a reception window starts at a time of receiving the indicator, a size of the reception window is configured by the base station, and a reception operation of the small data is not performed after the reception window ends.

14 . The operation method according to claim 10 , further comprising transmitting a hybrid automatic repeat request (HARQ) response for the small data to the base station in a random access (RA) procedure.

15 . The operation method according to claim 14 , wherein the HARQ response is a RA preamble, a first RA preamble corresponding to acknowledgement (ACK) is configured to be different from a second RA preamble corresponding to negative ACK (NACK), and configuration information of the first RA preamble and the second RA preamble is received from the base station.

16 . A terminal in a communication system, the terminal comprising:

a processor;

a memory electronically communicating with the processor; and

instructions stored in the memory,

wherein when executed by the processor, the instructions cause the terminal to:

receive configuration information for a transmission and reception operation of small data from a base station;

receive downlink control information (DCI) from the base station by performing a monitoring operation in a physical downlink control channel (PDCCH) monitoring occasion indicated by the configuration information;

determine that small data to be transmitted to the terminal exists in the base station based on an indicator included in the DCI; and

receive the small data associated with the indicator from the base station,

wherein the terminal operates in a radio resource control (RRC) idle state or an RRC inactive state.

17 . The terminal according to claim 16 , wherein the configuration information includes a paging-radio network temporary identifier (P-RNTI) or a small-RNTI (SM-RNTI) configured for transmission of the small data, and the monitoring operation is performed using the P-RNTI or the SM-RNTI.

18 . The terminal according to claim 16 , wherein the configuration information includes configuration information of a reception window, the reception window starts at a time of receiving the indicator, and the small data is received within the reception window.

19 . The terminal according to claim 16 , wherein the configuration information includes configuration information of a pre-allocated downlink resource (PDR), and the small data is received in the PDR.

20 . The terminal according to claim 16 , wherein the instructions further cause the terminal to transmit a hybrid automatic repeat request (HARD) response for the small data to the base station in a random access (RA) procedure.