 time interval from the frame where at least one initial ranging preamble code is detected. This message provides responses to all successfully received and detected ranging preamble codes in all the ranging opportunities in a frame indicated by the frame identifier. If all the detected ranging preamble codes indicate "success" status, the BS provides uplink bandwidth allocations for each detected ranging preamble code within a certain time interval. If the MS receives neither the ranging acknowledgement message (corresponding to the initial ranging preamble code and opportunity selected by the MS) nor uplink resource allocation, it assumes that its initial ranging request has failed and restarts the initial ranging procedure. CHAPTER 4 IEEE 802. 16m System Operation and State Diagrams The initial ranging attempt by the MS may result in three possible outcomes that are signaled via the ranging acknowledgement message (i.e., the message contains ranging status indications from the BS to the MS) as follows: The initial ranging preamble code was not successfully detected by the BS or the BS has determined that uplink transmission adjustments are necessary; therefore, the BS provides the required time, power, and possibly frequency adjustments to the MS ("continue" status). The initial ranging preamble code was successfully detected by the BS and the BS may provide the MS with time/frequency/power adjustments or uplink bandwidth allocation in order for the MS to send a ranging request message ("success" status). The initial ranging preamble code may or may not have been successfully detected by the BS and the BS requests the MS to abort the ranging process ("abort" status). Based on the outcome ranging response, the MS takes the following actions: Upon receiving a "continue" status indication and adjustment parameters in the ranging acknowledgement message, the MS adjusts its uplink transmission parameters according to the instructions by the BS and continues the ranging process by sending a ranging preamble code ran