A method for transmitting and receiving data performed by an eNB in a wireless communication system, comprising: receiving a first message requesting a first service quality from a device, wherein the first message includes a first indicator indicating the first message is transmitted by changing a configuration of one session of at least one preconfigured session; selecting a first session for transmitting the first message among the at least one preconfigured session based on a specific criteria used for selecting the first session, wherein the first session is previously configured for transmitting at least one message requesting a second service quality different from the first service quality; transmitting a configuration change request message that requests to change a first configuration of the first session based on the first service quality, to a network node, wherein the first configuration is changed temporarily; receiving a configuration change response message indicating a configuration change result in response to the configuration change request message; transmitting the first message through the first session or a second session according to the configuration change response message; and performing a procedure for establishing a third session supporting the first service quality when the first message is transmitted through the first session, wherein the procedure for establishing the third session is performed simultaneously with changing the first configuration, and wherein the message includes at least one of a destination address field including destination information of the message or a source address field including transmitter information of the message. receiving a first message requesting a first service quality from a device, wherein the first message includes a first indicator indicating the first message is transmitted by changing a configuration of one session of at least one preconfigured session; selecting a first session for transmitting the first message among the at least one preconfigured session based on a specific criteria used for selecting the first session, wherein the first session is previously configured for transmitting at least one message requesting a second service quality different from the first service quality; transmitting a configuration change request message that requests to change a first configuration of the first session based on the first service quality, to a network node, wherein the first configuration is changed temporarily; receiving a configuration change response message indicating a configuration change result in response to the configuration change request message; transmitting the first message through the first session or a second session according to the configuration change response message; and performing a procedure for establishing a third session supporting the first service quality when the first message is transmitted through the first session, wherein the procedure for establishing the third session is performed simultaneously with changing the first configuration, and wherein the message includes at least one of a destination address field including destination information of the message or a source address field including transmitter information of the message. <EOS>