A method, performed by a user equipment, UE,, in a wireless network, comprising: establishing a connection with a first radio access network, RAN,, wherein the UE is associated with a second RAN for LTE-WLAN aggregation, LWA; exchanging LWA address information with the first RAN, wherein the LWA address information identifies LWA entities for the LWA, and wherein the LWA address information comprises an identification, ID, and a MAC address of the associated second RAN, whereby said identification, ID, and said MAC address of the associated second RAN are being sent to the first RAN, and wherein a MAC address of the first RAN is being received from the first RAN; de-encapsulating data packets received from the second RAN and identifying packet data units, PDUs, of the first RAN based on a LWA routing rule which indicates Ethernet frame encapsulating using the LWA address information or indicates Generic Routing Encapsulation, GRE, tunneling; and sending data packets to the second RAN; characterized in that: the data packets are destined to the first RAN; wherein: the data packets are encapsulated as Ethernet frames, and wherein a source address, SA, of the Ethernet frames is a MAC address of a WiFi modem of the UE, and a receiver address, RA, is a MAC address of the first RAN; or the data packets are encapsulated as GRE packets, and wherein a tunnel source address is an IP address of a first RAN modem of the UE, a tunnel destination address is an IP address of the first RAN, and a tunnel inner IP address is an IP address of the second RAN; or an EtherType of the data packets indicates LWA packets. establishing a connection with a first radio access network, RAN,, wherein the UE is associated with a second RAN for LTE-WLAN aggregation, LWA; exchanging LWA address information with the first RAN, wherein the LWA address information identifies LWA entities for the LWA, and wherein the LWA address information comprises an identification, ID, and a MAC address of the associated second RAN, whereby said identification, ID, and said MAC address of the associated second RAN are being sent to the first RAN, and wherein a MAC address of the first RAN is being received from the first RAN; de-encapsulating data packets received from the second RAN and identifying packet data units, PDUs, of the first RAN based on a LWA routing rule which indicates Ethernet frame encapsulating using the LWA address information or indicates Generic Routing Encapsulation, GRE, tunneling; and sending data packets to the second RAN; characterized in that: the data packets are destined to the first RAN; wherein: the data packets are encapsulated as Ethernet frames, and wherein a source address, SA, of the Ethernet frames is a MAC address of a WiFi modem of the UE, and a receiver address, RA, is a MAC address of the first RAN; or the data packets are encapsulated as GRE packets, and wherein a tunnel source address is an IP address of a first RAN modem of the UE, a tunnel destination address is an IP address of the first RAN, and a tunnel inner IP address is an IP address of the second RAN; or an EtherType of the data packets indicates LWA packets. the data packets are encapsulated as Ethernet frames, and wherein a source address, SA, of the Ethernet frames is a MAC address of a WiFi modem of the UE, and a receiver address, RA, is a MAC address of the first RAN; or the data packets are encapsulated as GRE packets, and wherein a tunnel source address is an IP address of a first RAN modem of the UE, a tunnel destination address is an IP address of the first RAN, and a tunnel inner IP address is an IP address of the second RAN; or an EtherType of the data packets indicates LWA packets.