Question: In Figure, the DL subframe contains both DL-MAP and UL-MAP. Why not make UL-MAP a preamble in the UL subframe? Flgure IEEE 802.16 OFDMA Frame

In Figure, the DL subframe contains both DL-MAP and UL-MAP. Why

In Figure, the DL subframe contains both DL-MAP and UL-MAP. Why not make UL-MAP a preamble in the UL subframe? Flgure IEEE 802.16 OFDMA Frame Structure in TDD Mode Time gap Downlink subframe Uplink subframe Ranging subchannel FCH DL burst #3 UL burst #1 UL burst #2 DL burst #4 UL burst #3 DL burst #5 UL burst #4 DL burst #2 DL burst #6 UL burst #5 Time In Figure, the DL subframe contains both DL-MAP and UL-MAP. Why not make UL-MAP a preamble in the UL subframe? Flgure IEEE 802.16 OFDMA Frame Structure in TDD Mode Time gap Downlink subframe Uplink subframe Ranging subchannel FCH DL burst #3 UL burst #1 UL burst #2 DL burst #4 UL burst #3 DL burst #5 UL burst #4 DL burst #2 DL burst #6 UL burst #5 Time

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