This presentation gives in-depth discussion on these issues in Ultra Mobile Broadband communication systems. Topics include: 1. Frame structure, channelization and resource management; 2. Adaptive coding and modulation with HARQ; 3. Interference management: dynamic fractional frequency reuse and power control; 4. Handoff: (1) Disjoint forward and reverse links and intra-carrier handoff; (2) Beacons and inter-carrier handoff; 5. Multi antenna techniques: MIMO spatial multiplexing, single code word and multi code word transmissions, MMSE and MMSE-SIC receivers, spatial rank predication, precoding, beamforming, SDMA, and MIMO pilots; 6. Preamble design, system acquisition and determination;