nment A-MAPs in each assignment A-MAP group; HARQ feedback A-MAP index (1 bit), i.e., a parameter that is used to calculate HARQ feedback A-MAP index; HARQ feedback channel index (1 bit), i.e., a parameter that is used to calculate the HARQ feedback channel index; and the non-user- specific A-MAP extension flag (1 bit), i.e., whether the non-user specific A-MAP is extended. The extended non-user-specific part uses the same PHY structure as the non-user-specific A-MAP. The provision for the potential extension of the non-user-specific A-MAP has been reflected in the location of the non-user-specific A-MAP, as shown in Figure 10-5. A one-bit extension flag is also included to allow future extensions of the non-user-specific A-MAP fields. If the non-user-specific A-MAP 10.2 Downlink control channels extension flag is set, it indicates that the non-user-specific A-MAP is extended. The extended non-user- specific part has 12 bits and uses the same physical structure, i.e., channel coding, modulation, and MIMO encoding, as the non-user-specific A-MAP. The number of assignment A-MAPs in each assignment A-MAP group can be derived from the Assignment A-MAP Size indication field in the non-user-specific A-MAP IE using a lookup table. The actual number of assignment A-MAP IEs in each assignment A-MAP group is less than the value obtained from the lookup tables. The lookup tables, each with 256 entries (see Table 10-1), can be generated by the following equations for a particular assignment A-MAP modulation and coding set and fractional frequency reuse configuration. It must be noted that only one assignment A-MAP IE size of 56 bits inclusive of CRC is supported. The maximum number of MLRUs for the assignment A-MAP is 48 per subframe and the maximum number of assignment A-MAP information elements per subframe is limited to 32, whereas the maximum number of assignment A-MAP information elements per subframe that the BS may allocate to an MS is 8. Four assignment A-MAP group-sizes are defined: (1) when QPSK (1/2, 1/4) is used 