1. A communication device of enabling long term evolution (LTE)-Wireless Local Area Network (WLAN) aggregation, comprising:a storage device; and
a processing circuit, coupled to the storage device, wherein the storage device stores, and the processing circuit is configured to execute instructions of:
transmitting a first message indicating support of LTE-WLAN aggregation to a base station (BS) via LTE communication, when a WLAN function of the communication device is not enabled by an operating system of the communication device;
receiving a first configuration message configuring the LTE-WLAN aggregation from the BS via the LTE communication;
receiving at least one first LTE packet from the BS via the WLAN configured by a WLAN configuration in the first configuration message; and
transmitting a notification message indicating that a connection to the WLAN is lost or requesting the BS to release the WLAN configuration to the BS via the LTE communication, when the WLAN function of the communication device is enabled by the operating system of the communication device.