Method of operating in wireless system and wireless device using the same

A wireless device for interoperating with a wireless system transmits a first preamble over a first bandwidth followed by a frame over a second bandwidth, where the first bandwidth is different from the second bandwidth. The first preamble is readable by the wireless system and the wireless system reserves an interval for the wireless device to perform transmission. Hence, the wireless device is able to interoperate with the wireless system. 本发明提供了无线设备与无线系统交互的方法及无线设备。其中，所述方法包括：在第带宽上产生第前导码；在所述第带宽上发射所述第前导码，以及在第二带宽上发射跟随在所述第前导码之后的帧；其中，所述第带宽对应所述无线系统，且所述第带宽与所述第二带宽不同。实施本发明可使无线设备与无线系统进行交互，且无线系统为无线设备保留个时间间隔用于执行传输。