A multipath transmission system , comprising: a first network entity (E1, 510, 610, 1010) configured to convert an input data stream into a bundle of sub flows for transmission over a multipath transmission medium ; a second network entity (E2, 520, 620, 1020) configured to reconvert the bundle of sub flows received via the multipath transmission medium into an output data stream , wherein the conversion and reconversion are based on a network protocol that provides congestion control, without ensuring delivery nor in-order delivery of the bundle of sub flows , wherein the network protocol is a multipath extension of a Datagram Congestion Control Protocol, DCCP, wherein the first network entity (E1, 510, 610) is configured to convert an input data stream comprising OSI layer 4 payload into the bundle of sub flows without encapsulation into DCCP, and wherein the multipath transmission system is characterised by the first network entity (E1, 510, 610, 1010) being configured to: encapsulate an input data stream comprising OSI layer 2 or OSI layer 3 payload into DCCP before conversion into the bundle of sub flows , add an overall sequencing into an existing DCCP option which is transmitted to the second network entity (E2, 520, 620, 1020) or use one of reserved bit fields or type bit field of a DCCP generic header to indicate the overall sequencing to the second network entity (E2, 520, 620, 1020), and a reordering engine at the second network entity configured to reorder the sub flows according to the overall sequencing to provide the output data stream in a right order. a first network entity (E1, 510, 610, 1010) configured to convert an input data stream into a bundle of sub flows for transmission over a multipath transmission medium ; a second network entity (E2, 520, 620, 1020) configured to reconvert the bundle of sub flows received via the multipath transmission medium into an output data stream , wherein the conversion and reconversion are based on a network protocol that provides congestion control, without ensuring delivery nor in-order delivery of the bundle of sub flows , wherein the network protocol is a multipath extension of a Datagram Congestion Control Protocol, DCCP, wherein the first network entity (E1, 510, 610) is configured to convert an input data stream comprising OSI layer 4 payload into the bundle of sub flows without encapsulation into DCCP, and wherein the multipath transmission system is characterised by the first network entity (E1, 510, 610, 1010) being configured to: encapsulate an input data stream comprising OSI layer 2 or OSI layer 3 payload into DCCP before conversion into the bundle of sub flows , add an overall sequencing into an existing DCCP option which is transmitted to the second network entity (E2, 520, 620, 1020) or use one of reserved bit fields or type bit field of a DCCP generic header to indicate the overall sequencing to the second network entity (E2, 520, 620, 1020), and a reordering engine at the second network entity configured to reorder the sub flows according to the overall sequencing to provide the output data stream in a right order. encapsulate an input data stream comprising OSI layer 2 or OSI layer 3 payload into DCCP before conversion into the bundle of sub flows , add an overall sequencing into an existing DCCP option which is transmitted to the second network entity (E2, 520, 620, 1020) or use one of reserved bit fields or type bit field of a DCCP generic header to indicate the overall sequencing to the second network entity (E2, 520, 620, 1020), and a reordering engine at the second network entity configured to reorder the sub flows according to the overall sequencing to provide the output data stream in a right order. <EOS>