Optimization of application layer traffic carried by an IP connection over a mobile network

In an embodiment, there is provided a method for optimization of application layer traffic carried by an IP connection over a multi-access technology mobile network between a User Equipment UE and an IP connection endpoint in an IP network, said optimization being based on network information provided using a network information service, said network information including path costs capable of indicating preferences in terms of network paths for said IP connection, said preferences in terms of network paths including preferences in terms of access technologies.