l levels, are an important part of IEEE 802 work. 802.19 Coexistence The IEEE 802.19 Coexistence Technical Advisory http://grouper.ieee.org/groups/ Technical Advisory Group Group develops and maintains policies defining the 802/19/ responsibilities of 802 standards developers to address issues of coexistence with existing standards and other standards under development. It offers assessments to the Sponsor Executive Committee regarding the degree to which standards developers have conformed to those conventions. The TAG may also develop coexistence documentation of interest to the technical community outside 802. 802.20 Mobile Broadband The 802.20 Working Group specifies physical and http://www.ieee802.org/20/ Wireless Access medium access control layers of an air-interface for interoperable mobile broadband wireless access systems, operating in licensed bands below 3.5 GHz, optimized for IP-data transport, with peak data rates per user in excess of 1 Mbps. It supports various vehicular mobility classes up to 250 km/h in a MAN environment and targets spectral efficiencies, sustained user data rates and numbers of active users that are all significantly higher than achieved by existing mobile systems. 802.21 Media Independent The 802.21 Working Group develops standards to http://www.ieee802.org/21/ Handover enable handover and interoperability between heterogeneous network types including both 802 and non-802 networks. 802.22 Wireless Regional The 802.22 Working Group develops standard for http://www.ieee802.org/22/ Area Networks a cognitive radio-based PHY/MAC/air-interface for use by license-exempt devices on a non-interfering basis in spectrum that is allocated to the TV Broadcast Service. Request EC Request EC to approve approve forward and forward to to sponsor ballot RevCom Sponsor ballot RevCom approval Review ballot Standards Board comments, modify approval draft as needed REVIEW AND DRAFT STANDARD DRAFT STANDARD PUBLICATION BY SUBMISSION OF FORMATION OF WORKING IN WORKING IN IEEE SPONSOR REVCOM AND PAR AN