e, the existence of some parameters of the infor- mation elements are conditioned to use of certain system configurations; those conditions are not shown in the following tables in order to avoid distraction and confusion due to complexity. Table 10-3 Various A-MAP IE Types and their Usage [2] A-MAP IE Type Usage Property DL Basic Assignment Allocation information for an MS to decode DL bursts Unicast using continuous logical resources UL Basic Assignment Allocation information for an MS to transmit UL bursts Unicast using continuous logical resources DL Sub-band Assignment Allocation information for an MS to decode DL bursts Unicast using sub-band based resources UL Sub-band Assignment Allocation information for an MS to transmit UL bursts Unicast using sub-band based resources Feedback Allocation Allocation or de-allocation of UL fast-feedback control Unicast channels assigned to an MS UL Sounding Command Control information for an MS to start UL sounding Unicast transmission CDMA Allocation Allocation for an MS requesting bandwidth using a Unicast ranging or bandwidth request codes DL Persistent DL persistent resource allocation Unicast UL Persistent UL persistent resource allocation Unicast Feedback Polling Allocation for an MS to send MIMO feedback using Unicast MAC messages or extended headers Group Resource Allocation Group scheduling and resource allocation Multicast BW-REQ ACK Indication of decoding status of bandwidth request Multicast opportunities and resource allocation of bandwidth request header Broadcast Broadcast burst allocation and other broadcast Broadcast information 508 CHAPTER 10 The IEEE 802. 16m Physical Layer (Part II) The DL Basic Assignment A-MAP IE is used for resource assignment in the downlink. The DL Basic Assignment A-MAP IE consists of several information fields as summarized in Table 10-4. The Resource Index in the DL/UL Basic Assignment A-MAP IE identifies a resource block comprising a set of contiguous LRUs in a DL/UL subframe. The index determines the size of the allocated re