Method and device for transmitting user data through random access response message in mobile communication system

A method of operating a base station in a wireless communication system, the method comprising:

• receiving, from a mobility management entity (MME), a paging comprising user data;
• transmitting, to a terminal, a paging message comprising a dedicated preamble;
• receiving, from the terminal, the dedicated preamble based on the paging message;
• transmitting, to the terminal, a random access response (RAR) message based on the dedicated preamble;
• and
• receiving message3 from the terminal,
• wherein in case that there is user data related to downlink early data transmission (DL EDT) in a non-access-stratum (NAS) container included in the RAR message, the user data is decoded by the terminal, and
• wherein the decoded user data is inserted into the msg3.

A terminal comprising:

• a transceiver capable of transmitting and receiving at least one signal;
• and
• a controller connected to the transceiver,
• wherein the controller is configured to
• receive, from a base station, a paging message comprising a dedicated preamble,
• transmit, to the base station, the dedicated preamble based on the paging message,
• receive, from the base station, a random access response (RAR) message based on the dedicated preamble,
• in case that there is user data related to downlink early data transmission (DL EDT) in a non-access-stratum (NAS) container included in the received RAR message, decode the user data from the NAS container, and
• insert the user data into the message3 and transmit the same to the base station.

A base station comprising:

• a transceiver capable of transmitting and receiving at least one signal;
• and
• a controller connected to the transceiver,
• wherein the controller is configured to
• receive, from a mobility management entity (MIME), a paging comprising user data,
• transmit, to a terminal, a paging message comprising a dedicated preamble,
• receive, from the terminal, the dedicated preamble based on the paging message,
• transmit, to the terminal, a random access response (RAR) message based on the dedicated preamble, and
• receive message3 from the terminal,
• wherein in case that there is user data related to downlink early data transmission (DL EDT) in a non-access-stratum (NAS) container included in the RAR message, the user data is decoded by the terminal, and
• wherein the decoded user data is inserted into the msg3.