ecome battery powered under wireless USB. Effective power management mechanisms will be required. Provide wired Device authentication and data encryption aim to provide the equivalent security same level of security as wired USB. Ease of use Plug and play is the user expectation for USB devices, and wireless USB is designed to continue that tradition. Preserve USB Wireless USB defines a specific device class (Wired Adapter) investment to allow wired USB devices or hosts to support wireless USB devices. stream video to multimedia consumer electronic devices, as well as offer high-speed connections to PC peripherals and other mobile devices. Revision 1.0 of the wireless USB specification was released in May 2005. Wireless USB devices share bandwidth through a host- scheduled TDMA based media access protocol. A hub and spokes logical topology is used, with each host supporting up to 127 devices and, like wired USB, system software is designed to accommodate devices connecting to or disconnecting from the host at any time. A "dual role" device is also defined to enable peer-to-peer connections. Protocol Stack The foundations of the wireless USB protocol stack are the PHY and MAC layer specifications developed by the MBOA-Special Interest Group (SIG). Since the merging of the MBOA-SIG and the WiMedia Alliance in March 2005, these specifications are now being finalised and promoted by the combined WiMedia-MBOA Alliance. Wireless PAN Standards Applications Wireless USB Other USB driver Wireless technologies Networking running over UWB radio Host Controller Interface Convergence Layer Medium Access Controller (UWB MAC) radio platform Ultrawideband radio (UWB PHY) Figure 10-3: Wireless USB Protocol Stack Wireless USB is one of the number of higher level technologies that will run over the MBOA PHY and MAC (Figure 10-3) layers, and the wireless USB specification defines the way in which a wireless USB communication channel is established using these lower layers. At the application level, wireless USB is functionally ident