Method and apparatus for transmitting and receiving data in communication system

Abstract

An operation method of a base station in a communication system may include 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.

What is claimed is: 
     
         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.