3 The structure of the A-MAP region A-MAP IE is present in the assignment A-MAP group, the multicast assignment A-MAP IEs are located immediately after the broadcast assignment A-MAP IE. The Group Resource Allocation A-MAP IE is an example of a multicast assignment A-MAP IEs [2]. The unicast assignment A-MAP IE sent to a particular mobile station is transmitted in the same assignment A-MAP group. The DL/UL Basic Assignment A-MAP IE is an example of unicast assignment A-MAP IE. The BS may allocate a maximum of eight assignment A-MAP IEs to a particular MS in any subframe. This number includes all of the assignment A-MAP IEs that are decoded by the MS. For an assignment A-MAP IE that can be segmented (i.e., an assignment A-MAP IE that occupies more than one MLRU when modulated with QPSK 1/2), each segment is counted as one assignment A-MAP IE. The physical layer procedures for various A-MAP IE types are shown in Figure 10-4. The non-user specific A-MAP IE carries 12 bits of information and is encoded using Tail Biting Convolutional Code (TBCC) with an effective code rate of 1/12. More specifically, when using 10.2 Downlink control channels Non-user Non-user Specific Channel A-MAP Coding Repetition Modulator Encoder Specific A-MAPSymbols Physical Processing of Non-user Specific A-MAP Information Elements Assignment Channel Assignment A-MAP A-MAP-IE Scrambler Insertion Coding Repetition Modulator Encoder Symbols Physical Processing of Assignment A-MAP Information Elements HARQ Feedback A-MAP-IE Repetition Scramble Multiplexing HARQ Feedback A-MAP-IE Repetition Scramble HARQ Feedback Encoder/ Precoder A-MAP Symbols HARQ Feedback A-MAP-IE Repetition Scramble Multiplexing HARQ Feedback A-MAP-IE Repetition Scramble Physical Processing of HARQ Feedback A-MAP Information Elements ith Power Control A-MAP IE Modulator Repetition Power Control Encoder/ Precoder A-MAP Symbols (i+1)th Power Control Modulator Repetition A-MAP IE Physical Processing of Power Control A-MAP Information Elements FIGURE 10-4 Physical layer procedures