A communication system for exchanging policies comprising a policy entity for an Access Traffic Steering, Switching and Splitting, ATSSS, Overlay, a mobile core, a User Equipment, UE,, and a multi-connectivity provider having a multi-connectivity termination point, wherein the ATSSS Overlay is configured to provide multi-connectivity without an ATSSS user plane function, characterized in that the ATSSS Overlay is an ATSSS as defined by the 3GPP differentiate from the fact that it has at least multipath support, with a backend entity, a ATSSS Overlay Core Server, that replaces the ATSSS user plane function, resembling on backend side the ATSSS UPF, the backend entity being located at: a Mobile virtual network operator, MVNO; a multi-connectivity provider with or without own access resources; a mobile network operator, MNO, with EPC; a MNO without the coupling with fundamentals core components such as Session Management Function, SMF, Access and Mobility Management Function, AMF, and Policy Control Function, PCF; a fixed network operator, FNO; or a public cloud environment, the policy entity is configured to communicate ATSSS Overlay specific rules with the UE and/or to the multi-connectivity termination point, and the ATSSS Overlay specific rules comprise one or more of the following parameters: an indication whether the ATSSS Overlay is enabled or disabled; information regarding the ATSSS Overlay Core Server comprising IP address, port number, and/or Fully Qualified Domain Name, FQDN; ATSSS Overlay Traffic management rules for steering, switching and splitting; ATSSS Overlay coverage information comprising application information, destination address information, locality information, network protocol information, environment information. the ATSSS Overlay is an ATSSS as defined by the 3GPP differentiate from the fact that it has at least multipath support, with a backend entity, a ATSSS Overlay Core Server, that replaces the ATSSS user plane function, resembling on backend side the ATSSS UPF, the backend entity being located at: a Mobile virtual network operator, MVNO; a multi-connectivity provider with or without own access resources; a mobile network operator, MNO, with EPC; a MNO without the coupling with fundamentals core components such as Session Management Function, SMF, Access and Mobility Management Function, AMF, and Policy Control Function, PCF; a fixed network operator, FNO; or a public cloud environment, a Mobile virtual network operator, MVNO; a multi-connectivity provider with or without own access resources; a mobile network operator, MNO, with EPC; a MNO without the coupling with fundamentals core components such as Session Management Function, SMF, Access and Mobility Management Function, AMF, and Policy Control Function, PCF; a fixed network operator, FNO; or a public cloud environment, the policy entity is configured to communicate ATSSS Overlay specific rules with the UE and/or to the multi-connectivity termination point, and the ATSSS Overlay specific rules comprise one or more of the following parameters: an indication whether the ATSSS Overlay is enabled or disabled; information regarding the ATSSS Overlay Core Server comprising IP address, port number, and/or Fully Qualified Domain Name, FQDN; ATSSS Overlay Traffic management rules for steering, switching and splitting; ATSSS Overlay coverage information comprising application information, destination address information, locality information, network protocol information, environment information. an indication whether the ATSSS Overlay is enabled or disabled; information regarding the ATSSS Overlay Core Server comprising IP address, port number, and/or Fully Qualified Domain Name, FQDN; ATSSS Overlay Traffic management rules for steering, switching and splitting; ATSSS Overlay coverage information comprising application information, destination address information, locality information, network protocol information, environment information.