In this paper, an IEEE 802.15.6 Wireless Body Area Networks (WBAN) medium access control protocol is developed to support a Wireless USB (WUSB) application as a Protocol Adaptation Layer (PAL). To successfully set up wireless communication links, the WUSB channel should be encapsulated privately within a WBAN super frame. However, in the current IEEE 802.15.6 WBAN standard there is no available periods allocated for other heterogeneous networks. In this paper, the authors propose a WBAN Beacon Structure (WBS) of IEEE 802.15.6 WBAN to set up WUSB channel efficiently. Simulation results show that the WBS integrates WUSB transactions and WBAN traffic efficiently in a hierarchical WUSB/WBAN Medium Access Control (MAC) protocol.