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

A method performed by a terminal capable of communicating with a master node and a secondary node in a wireless communication method, the method comprising:

• detecting a secondary cell group (SCG) failure related to the secondary node;
• initiating an SCG failure reporting procedure based on the detection of the SCG failure;
• switching a primary path of a split signaling radio bearer 1 (SRB1) from a radio link control (RLC) bearer of the SCG to an RLC bearer capable of using a primary cell (PCell), among a plurality of RLC bearers of a master cell group (MCG);
• and
• transmitting, to the master node a message related to the SCG failure via the RLC bearer capable of using the PCell,
• wherein a list of cells available for the RLC bearer is configured by logical channel configuration included in an RRC reconfiguration message.

A terminal capable of communicating with a master node and a secondary node in a wireless communication system, the terminal comprising:

• a transceiver;
• memory, comprising one or more storage media, storing instructions;
• and
• at least one processor communicatively coupled to the transceiver and the memory,
• wherein the instructions, when executed by the one or more processors individually or collectively, cause the terminal to:
• detect a master cell group (MCG) failure related to the master node,
• initiate an MCG failure reporting procedure based on the detection of the MCG failure,
• start a timer for the MCG failure reporting procedure,
• switch a primary path of a split signaling radio bearer 1 (SRB1) from a radio link control (RLC) bearer of the MCG to an RLC bearer capable of using a primary secondary cell (PSCell), among a plurality of RLC bearers of a secondary cell group (SCG), and
• transmit through the transceiver, to the master node, a message related to the MCG failure via the RLC bearer capable of using the PSCell, and
• wherein a list of cells available for the RLC bearer is configured by logical channel configuration included in an RRC reconfiguration message.