e stations attempting random access. Once the dedicated ranging code is successfully received by the target BS, it allocates uplink radio resources, allowing the MS to send an AAI_RNG-REQ message and/or UL user data. If the target BS does not receive the dedicated ranging code within HO Ranging_ Initiation_Deadline time interval, the target BS discards the pre-assigned STID of the MS. As shown in Figure 6-16, if CDMA-based handover ranging is enabled and the MS does not have a dedicated ranging code or a dedicated ranging opportunity with the target BS, the MS transmits a randomly- selected handover ranging code at the earliest ranging opportunity. If the MS is sufficiently synch- ronized with the target BS, as determined by the serving BS, the CDMA-based ranging can be skipped while performing network entry with the target BS. In that case, the MS applies independently-calculated adjustments when starting network entry with the target BS by measuring and comparing the time difference between the DL synchronization signals of the target and serving base stations. The serving BS may send an AAI_RNG-RSP message with timing/power adjustment parameters regardless of whether CDMA-based ranging is enabled. In that case, the MS must apply the adjustments to the subsequent uplink transmissions. The serving BS may also send an AAI_RNG-RSP message with ranging status parameter set to continue SO that the MS performs CDMA-based ranging with randomly selected handover ranging code in the next ranging opportunity to properly adjust its uplink transmission timing/power. As shown in Figure 6-17, during network re-entry, the MS initiates the AAI_RNG-REQ/RSP message by sending an AAI_RNG-REQ message before the deadline specified by the HO Ranging Initiation Deadline parameter contained in the AAI_HO-CMD message during handover preparation. The time is measured from the transmission instant of the AAI_HO-CMD message. If the target BS does not receive the AAI_RNG-REQ message from the MS within the time interval defined by the HO Th