A method of multi-radio interworking to provide integrated cellular and wireless local area network, WLAN, access for a multi-radio device in a wireless communication network, wherein said multi-radio device is a user equipment, UE, said method comprising: transmitting, by a network server, a service initiation message to a packet data network gateway PDN-GW for sending a paging message to the UE, wherein the paging message contains WLAN information of a WLAN access network for the UE to access; transmitting, by the PDN-GW, the paging message to a mobility management entity MME of a LTE cellular network; forwarding, by the MME, the paging message to the UE via an E-UTRAN access network of the LTE cellular network, wherein the paging message informs the UE to establish a WLAN connection for data service through the WLAN access network, instead of through the E-UTRAN access network; obtaining the WLAN information by the UE in the LTE cellular network, wherein the WLAN information is received in the paging message from a serving base station in the LTE cellular network, and wherein the UE is equipped with both a cellular module and a WLAN module; activating, by the UE, access to the WLAN via the WLAN module based on the obtained WLAN information such that the UE has capability to connect with both the LTE cellular network and the WLAN; sending, by the UE, a paging response through the WLAN to the PDN-GW in response to the paging message, wherein the UE starts WLAN offload setup with a wireless access gateway (WAG, 115) and transmits the paging response through the WLAN access network to the PDN-GW; and offloading, by the UE, data traffic from the LTE cellular network to the WLAN, wherein the UE simultaneously connects to the LTE cellular network and the WLAN, wherein the WLAN connection is established after transmitting the paging response and packet data service flow is established through the WLAN access network, said method further comprising: deactivating, by the UE, the access to the WLAN via the WLAN module based on a triggering condition, wherein the triggering condition comprises a notification from the serving base station, and wherein the notification contains WLAN coverage information. transmitting, by a network server, a service initiation message to a packet data network gateway PDN-GW for sending a paging message to the UE, wherein the paging message contains WLAN information of a WLAN access network for the UE to access; transmitting, by the PDN-GW, the paging message to a mobility management entity MME of a LTE cellular network; forwarding, by the MME, the paging message to the UE via an E-UTRAN access network of the LTE cellular network, wherein the paging message informs the UE to establish a WLAN connection for data service through the WLAN access network, instead of through the E-UTRAN access network; obtaining the WLAN information by the UE in the LTE cellular network, wherein the WLAN information is received in the paging message from a serving base station in the LTE cellular network, and wherein the UE is equipped with both a cellular module and a WLAN module; activating, by the UE, access to the WLAN via the WLAN module based on the obtained WLAN information such that the UE has capability to connect with both the LTE cellular network and the WLAN; sending, by the UE, a paging response through the WLAN to the PDN-GW in response to the paging message, wherein the UE starts WLAN offload setup with a wireless access gateway (WAG, 115) and transmits the paging response through the WLAN access network to the PDN-GW; and offloading, by the UE, data traffic from the LTE cellular network to the WLAN, wherein the UE simultaneously connects to the LTE cellular network and the WLAN, wherein the WLAN connection is established after transmitting the paging response and packet data service flow is established through the WLAN access network, said method further comprising: deactivating, by the UE, the access to the WLAN via the WLAN module based on a triggering condition, wherein the triggering condition comprises a notification from the serving base station, and wherein the notification contains WLAN coverage information. deactivating, by the UE, the access to the WLAN via the WLAN module based on a triggering condition, wherein the triggering condition comprises a notification from the serving base station, and wherein the notification contains WLAN coverage information.