L Subframe DL Subframe UL Subframe Legacy Radio Frame 5 ms Legacy DL Subframe ULULUDDLDLDLDLULULUDDLDLDLDLULULULDL ULULDLDLDLDLDLULULULDDL New Frame 5 ms New DL Subframe Superframe 20 ms FIGURE 1 Example Sharing of Time-Frequency Resources over one Radio Frame between IEEE 802. .16m and the Legacy Systems in TDD Mode Table 1 Comparison of the Legacy Mobile WiMAX Features with IEEE 802.16m Legacy Mobile WiMAX based Feature on Release 1.0 IEEE 802.16m Duplexing Scheme TDD and FDD Frame Structure 5 ms radio frames with flexible time-zones 5 ms radio frames with subframe-based fixed time-zones Superframe Structure Not supported 20 ms duration (4 consecutive radio frames) Operating Bandwidth 5, 7, 8.75, and 10 5, 7, 8.75, 10, and 20 (up to 100 MHz with carrier aggregation (MHz) and other channel bandwidths through tone dropping) Resource Block Size Fixed 48 data sub-carriers 18 sub-carriers by 6 OFDM symbols physical resource units and variable number of data sub-carriers depending on the MIMO Control Channel Partial Usage of Sub-Channels in the downlink Distributed logical resource units (tone-pair based distributed Subchannelization and uplink (distributed permutations) permutations) Traffic Channel Partial Usage of Sub-Channels in the downlink Distributed logical resource units (distributed permutations) Subchannelization and uplink (distributed permutations) Sub-band logical resource units (localized permutations) Mini-band logical resource units (physical resource unit-based diversity permutations) Permutation Zone Time Division Multiplexing of different zones Frequency Division Multiplexing in the same subframe Multiplexing Pilot Design Common (non-precoded) and dedicated Non-adaptive precoded pilots for distributed logical resource (precoded) pilots depending on the permutation units, dedicated pilots per physical resource unit for sub-band and mini-band logical resource units; interlaced pilots for interference mitigation Turbo Codes Convolutional Turbo Codes with minimum code Convolutional Turbo Codes with mi