0, the fast feedback channel is de-allocated. If d = Ob111, the MS continues the reporting until terminated by the ACK Allocation Flag Indicate if one ACK channel is allocated to acknowledge the successful detection of this IE. ACK Allocation Flag is set by the BS to Ob1, if Allocation Duration equals 0b000, or is set to Ob1, if Allocation Duration is not equal to Ob000 and the Channel Index of the newly allocated fast feedback channel is the same as that of the de-allocated channel. HARQ Feedback Index of HARQ Feedback Allocation to acknowledge receipt of this Allocation A-MAP IE. MIMO Feedback MIMO Feedback Mode (see Table 10-25). Maximum Number of Variable Variable number of bits whose value depends on number of Streams transmit antenna Nt (2,4,8). Feedback Format This parameter specifies the feedback format index when reporting fast feedback information. Frequency partition indication. The BS asks the MS to send wideband CQI and spatial rate of the frequency partition and reuse factor in the future: Ob0: Frequency partition index 1; Ob1: Frequency partition index 2; BS sets FPI to a value that FPSFPi > 0. Frequency Partition Frequency partition indication. BS indicates MS to send wideband Indication CQI and STC rate of the frequency partition and reuse factor in the future: Ob00: Frequency partition index 0; 0b01: Frequency partition index 1; Ob10: Frequency partition index 2; (Continued) CHAPTER 10 The IEEE 802. 16m Physical Layer (Part II) Table 10-7 Feedback Allocation A-MAP IE Parameters [2] Continued Parameter Size (Bits) Description Ob11: Frequency partition index 3; BS sets FPi to a value such that FPSFPI > 0. Long-Short FPi Used to inform the MS to switch short and long-term reporting Switch Flag based on the FPi of the latest data allocation: Ob0: FPi for long and short-term period report remains constant for the allocation duration; Ob1: FPj for long and short-term period changes after every update FPi of last data allocation at the subsequent long-term feedback opportunity. Long-Term FPi Frequency 