 value. CHAPTER 9 The IEEE 802. 16m Physical Layer (Part I) Receive/Transmit Transition Gap (RTG), and Base Station Identifier (BS-ID) are mandatory DCD information fields, whereas DL Adaptive Modulation and Coding (AMC) allocated physical bands bitmap is configuration-dependent in DCD information fields where it is present when AMC permu- tation is used. Similarly, Tile Usage of Subchannels Type 1 (TUSC1) permutation active subchannels bitmap is also a configuration-dependent DCD information field when TUSC1 permutation is used. In a similar note, the information fields of the UCD message that are used for all types of system config- urations are referred to as mandatory UCD information fields. On the other hand, the information fields of the UCD message that are used only for some system configurations are referred to as configuration- dependent UCD information fields. For example, frequency, and periodic ranging codes are mandatory UCD information fields, whereas Band AMC Allocation Threshold is a configuration-dependent DCD information field when Band AMC permutations are used. For mandatory-DCD/UCD information fields, the third columns of Table 9-12 and Table 9-13 show "Always," whereas configuration-dependent DCD information fields the third column of these tables show the configuration for which configuration- dependent information is included in the DCD/UCD messages. It is noted that the information fields of the DCD/UCD messages are not categorized and transmitted based on necessity and time-sensitivity of the parameters for different system operations such as handover, network entry, etc. A drawback of the above legacy mechanism to the broadcast system configuration is that the location and content of the DCD/UCD messages would not be known to the MS until the DL MAP (i.e., downlink control channel) is successfully decoded. If the location of the system configuration information (i.e., the broadcast channel) is fixed SO that on successful DL synchronization and preamble detection, the broadcast channel 