A User Equipment, UE, (205, 700) for wireless communication, the UE (205, 700) comprising at least one memory and at least one processor coupled with the at least one memory and configured to cause the UE (205, 700) to: in response to receiving a first request via a first data connection (315, 405) with a first mobile communication network (215, 305), the first data connection (315, 405) supporting a plurality of quality of service, QoS, flows, the first request containing a first set of parameters for establishing a second data connection with an interworking function in a second mobile communication network (220, 310), wherein the first request is received from the interworking function, and wherein data traffic of the second data connection is to be transferred through the first data connection (315, 405), and in response to determining that none of the existing QoS flows of the first data connection (315, 405) is suitable to fulfill the QoS requirements of the second data connection: initiate a modification procedure with the first mobile communication network (215, 305) by sending a second request to modify the first data connection (315, 405), the second request containing a second set of parameters derived from the first set of parameters, wherein the second set of parameters indicate to establish a new QoS flow over the first data connection (315, 405), wherein the new QoS flow is to carry the data traffic of the second data connection, and the second set of parameters modify the first data connection (315, 405) for supporting the data traffic of the second data connection; and transmit the data traffic of the second data connection through the modified first data connection (315, 405). in response to receiving a first request via a first data connection (315, 405) with a first mobile communication network (215, 305), the first data connection (315, 405) supporting a plurality of quality of service, QoS, flows, the first request containing a first set of parameters for establishing a second data connection with an interworking function in a second mobile communication network (220, 310), wherein the first request is received from the interworking function, and wherein data traffic of the second data connection is to be transferred through the first data connection (315, 405), and in response to determining that none of the existing QoS flows of the first data connection (315, 405) is suitable to fulfill the QoS requirements of the second data connection: initiate a modification procedure with the first mobile communication network (215, 305) by sending a second request to modify the first data connection (315, 405), the second request containing a second set of parameters derived from the first set of parameters, wherein the second set of parameters indicate to establish a new QoS flow over the first data connection (315, 405), wherein the new QoS flow is to carry the data traffic of the second data connection, and the second set of parameters modify the first data connection (315, 405) for supporting the data traffic of the second data connection; and transmit the data traffic of the second data connection through the modified first data connection (315, 405).