on required to decode the user-specific control blocks. The Minimum A-MAP Logical Resource Unit (MLRU) is used for the assignment A-MAPs. The minimum logical resource unit in the assignment A-MAP consists of NMLRU = 56 sub-carriers. The assignment A-MAP IE is transmitted with one MLRU or multiple concatenated MLRUs in the A-MAP region. The number of logically contiguous MLRUs is determined based on the assignment A-MAP IE size and channel coding rate where the channel coding rate is selected based on the mobile station's channel quality reports. The assignment A-MAP IEs are grouped together based on the channel coding rate. Assignment A-MAP IEs in the same group are transmitted in the same frequency partition with the same channel coding rate. Each assignment A-MAP group contains several logically contiguous MLRUs. The number of assignment A-MAP IEs in each assignment A-MAP group is signaled through a non-user specific A-MAP in the same subframe. If two assignment A-MAP groups using two channel coding rates exist in an A-MAP region, the assign- ment A-MAP group using the lower channel coding rate is allocated first, followed by the assign- ment A-MAP group using higher channel coding rate. If a broadcast assignment A-MAP IE (i.e., an assignment A-MAP IE sent to all mobile stations) exists in a DL subframe, it is located at the beginning of either assignment A-MAP Group 1 or assignment A-MAP Group 2. All the multicast assignment A-MAP Ies (i.e., assignment A-MAP IEs that are sent to specific groups of users present in any assignment A-MAP group) occupy contiguous set of MLRUs from the beginning of the assignment A-MAP group. If the broadcast assignment CHAPTER 10 The IEEE 802. 16m Physical Layer (Part II) H-ARQ Feedback A-MAP Power Control A-MAP Non-User Specific A-MAP Assignment A-MAP A-MAP Region Distributed Resource Units Partition Assignment A-MAP Localized Resource Units Partition DL/UL Subframes A-MAP A-MAP A-MAP A-MAP A-MAP A-MAP Region Location in TDD Mode with 4:4 DL:UL Ratio Radio Frame = 5 ms FIGURE 10-