A method performed by a network element in a Policy Control and Charging, PCC, system in a communication network, the method comprising: establishing a first Internet Protocol, IP, Connectivity Access Network, CAN, session with a first Policy and Charging Enforcement Function, PCEF, in the PCC system, the first PCEF being associated with a first Public Data Network, PDN, connection between a Multi-Path Transmission Control Protocol, MPTCP, capable radio device and an MPTCP proxy; establishing a second IP-CAN session with a second PCEF in the PCC system, the second PCEF being associated with a second PDN connection between the radio device and the MPTCP proxy; establishing a third IP-CAN session with a third PCEF in the PCC system, the third PCEF being associated with an IP connection between the MPTCP proxy and a PDN, the IP connection being configured for carrying data from both the first PDN connection and the second PDN connection; establishing a fourth IP-CAN session with a Policy and Charging Rules Function, PCRF, in the PCC system; receiving information from the MPTCP proxy, over an interface (Yz) between the network element and the MPTCP proxy, about an internal relationship between the first PDN connection, the second PDN connection and the IP connection; receiving information comprising a first PCC Rules Provision message from the PCRF over the established fourth IP-CAN session; processing a rule from the received first PCC Rules Provision message to obtain a rule for enforcement on data traffic between the radio device and the PDN in any of the first PDN connection, the second PDN connection and the IP connection; and sending instructions relating to the obtained rule over any of the established first, second, and third IP-CAN sessions. establishing a first Internet Protocol, IP, Connectivity Access Network, CAN, session with a first Policy and Charging Enforcement Function, PCEF, in the PCC system, the first PCEF being associated with a first Public Data Network, PDN, connection between a Multi-Path Transmission Control Protocol, MPTCP, capable radio device and an MPTCP proxy; establishing a second IP-CAN session with a second PCEF in the PCC system, the second PCEF being associated with a second PDN connection between the radio device and the MPTCP proxy; establishing a third IP-CAN session with a third PCEF in the PCC system, the third PCEF being associated with an IP connection between the MPTCP proxy and a PDN, the IP connection being configured for carrying data from both the first PDN connection and the second PDN connection; establishing a fourth IP-CAN session with a Policy and Charging Rules Function, PCRF, in the PCC system; receiving information from the MPTCP proxy, over an interface (Yz) between the network element and the MPTCP proxy, about an internal relationship between the first PDN connection, the second PDN connection and the IP connection; receiving information comprising a first PCC Rules Provision message from the PCRF over the established fourth IP-CAN session; processing a rule from the received first PCC Rules Provision message to obtain a rule for enforcement on data traffic between the radio device and the PDN in any of the first PDN connection, the second PDN connection and the IP connection; and sending instructions relating to the obtained rule over any of the established first, second, and third IP-CAN sessions.