up in the DL or UL, the BS transmits a Group Configuration MAC control message. It further requires allocation of resources to mobile stations within a group. In order to assign resources to one or more mobile stations in a group, the BS sends the Group Resource Allocation A-MAP IE which is included in the user-specific resource assignment in an A-MAP region. This information element contains bitmaps to identify scheduled mobile stations, and to signal MIMO mode HARQ burst size and resource size. Table 10-12 shows the parameters and their corresponding values in the group allocation information element. The Feedback Polling A-MAP IE is used by the BS to schedule MIMO feedback transmission by the MS. The MS sends MIMO feedback using a MAC control message or a MAC signaling header, depending on the requested feedback content. If a dedicated UL resource is allocated, it will be used by the MS to transmit feedback at the designated feedback transmission frame; otherwise, in the designated transmission frame, the MS composes the feedback and the BS either includes an uplink allocation for the transmission using UL Basic Assignment A-MAP IE or UL Sub-band Assignment A-MAP IE, or the MS transmits in a dedicated uplink allocation assigned by a previous Feedback Polling A-MAP IE in the same subframe with feedback periods designating the same transmission frames. The MS sends the feedback in a MAC signaling header when wideband information for any combinations of MIMO feedback modes 0, 4, and 7 that are requested. CHAPTER 10 The IEEE 802. 16m Physical Layer (Part II) Table 10-10 DL Persistent Allocation A-MAP IE Parameters [2] Parameter Size (Bits) Description A-MAP IE Type DL Persistent Allocation A-MAP IE. Allocation Period Period of persistent allocation: Ob00 de-allocation of a persistently allocated resource; 0b01 2 frames; 0b10 4 frames; Ob11 8 frames. Resource Index Confirmation of the resource index for a previously assigned persistent resource which has been de-allocated (Resource index includes location and alloc