A method for transmitting and receiving a packet in a wireless communication system, the method performed by a first network node comprising: receiving (S801, S811, S1902, S2203, S2602) a first message in relation to a connection configuration of a specific flow from a user equipment, UE, , wherein the first message includes first control information in relation to the specific flow and a synchronization, SYN, packet used for a synchronization between the UE and the first network node, and wherein the first control information includes a first flow identifier, ID, distinguishing a flow, data size information indicating a size of a next data and first action code information instructing a resource allocation of the first network node; transmitting (S1904, S2204, S2604) the first message to a second network node; receiving (S1906, S2606) a second message in response to the first message from the second network node, wherein the second message includes SYN/acknowledgement, ACK, packet and a second flow ID distinguishing a flow; checking (S1907, S2607) whether the first flow ID and the second flow ID are identical; determining a size of an uplink, UL, grant related to the next data, based on the data size information; transmitting (S807, S813, S1909, S2609) the UL grant to the UE by considering a processing time of the UE when the first flow ID and the second flow ID are identical; and receiving (S809, S815, S1910, S2610) a third message including (i) the next data and (ii) second control information from the UE through the UL grant, wherein the second control information includes the first flow ID and is characterised by including second action code information instructing no action of a base station, BS . receiving (S801, S811, S1902, S2203, S2602) a first message in relation to a connection configuration of a specific flow from a user equipment, UE, , wherein the first message includes first control information in relation to the specific flow and a synchronization, SYN, packet used for a synchronization between the UE and the first network node, and wherein the first control information includes a first flow identifier, ID, distinguishing a flow, data size information indicating a size of a next data and first action code information instructing a resource allocation of the first network node; transmitting (S1904, S2204, S2604) the first message to a second network node; receiving (S1906, S2606) a second message in response to the first message from the second network node, wherein the second message includes SYN/acknowledgement, ACK, packet and a second flow ID distinguishing a flow; checking (S1907, S2607) whether the first flow ID and the second flow ID are identical; determining a size of an uplink, UL, grant related to the next data, based on the data size information; transmitting (S807, S813, S1909, S2609) the UL grant to the UE by considering a processing time of the UE when the first flow ID and the second flow ID are identical; and receiving (S809, S815, S1910, S2610) a third message including (i) the next data and (ii) second control information from the UE through the UL grant, wherein the second control information includes the first flow ID and is characterised by including second action code information instructing no action of a base station, BS . <EOS>