Gateway for a communication system, the gateway comprising: a transceiver configured to receive a sequence of data packets on a Radio Access Bearer, RAB, from a core network, receive at least one flow control message (920, 902a, 902b) associated with the RAB; and a processor configured to obtain a first distribution of the received sequence of data packets into a first sub-sequence of data packets and at least a second sub-sequence of data packets, obtain the first distribution by determining the first distribution based on at least the received at least one flow control message (920, 902a, 902b), wherein a first flow control message is received from a master access node and comprises a second distribution of the first sub-sequence of data packets into a third sub-sequence of data packets and at least a fourth sub-sequence of data packets, and further indicating that the fourth sub-sequence is addressed for a secondary access node; wherein the transceiver is configured to forward the first sub-sequence of data packets on the RAB to the master access node, forward the second sub-sequence of data packets on the RAB to the secondary access node. a transceiver configured to receive a sequence of data packets on a Radio Access Bearer, RAB, from a core network, receive at least one flow control message (920, 902a, 902b) associated with the RAB; and receive a sequence of data packets on a Radio Access Bearer, RAB, from a core network, receive at least one flow control message (920, 902a, 902b) associated with the RAB; and a processor configured to obtain a first distribution of the received sequence of data packets into a first sub-sequence of data packets and at least a second sub-sequence of data packets, obtain the first distribution by determining the first distribution based on at least the received at least one flow control message (920, 902a, 902b), wherein a first flow control message is received from a master access node and comprises a second distribution of the first sub-sequence of data packets into a third sub-sequence of data packets and at least a fourth sub-sequence of data packets, and further indicating that the fourth sub-sequence is addressed for a secondary access node; obtain a first distribution of the received sequence of data packets into a first sub-sequence of data packets and at least a second sub-sequence of data packets, obtain the first distribution by determining the first distribution based on at least the received at least one flow control message (920, 902a, 902b), wherein a first flow control message is received from a master access node and comprises a second distribution of the first sub-sequence of data packets into a third sub-sequence of data packets and at least a fourth sub-sequence of data packets, and further indicating that the fourth sub-sequence is addressed for a secondary access node; wherein the transceiver is configured to forward the first sub-sequence of data packets on the RAB to the master access node, forward the second sub-sequence of data packets on the RAB to the secondary access node. forward the first sub-sequence of data packets on the RAB to the master access node, forward the second sub-sequence of data packets on the RAB to the secondary access node.