om the Anchor BS. An acknowledgement with MOB_BSHO-RSP for this notification is required. After MS transmits MOB_MSHO-REQ, the MS will not transmit any MOB_MSHO-REQ prior to expiration of an internal timer, MS_handover_retransmission_timer. The MS deactivates the timer MS_handover_retransmission_timer on transmission of a MOB_HO-IND message by the MS or receipt of a MOB_BSHO-RSP message. The Anchor BS update may also begin with anchor switching indication via fast-feedback channel. If an MS that transmitted a MOB_MSHO-REQ message detects an incoming MOB_BSHO-REQ message, it ignores the MOB_BSHO-REQ message. Similarly, a BS that transmitted a MOB_BSHO-REQ message and detects an incoming MOB_MSHO-REQ or MOB_HO-IND message from the same MS discards its own previous request. The base stations involved in MDHO with an MS must use the same set of CIDs for the connections that are established with the MS. The BS may assign a new set of CIDs to the MS during Diversity Set update through MOB_BSHO-REQ and MOB_BSHO-RSP messages. There are several conditions that are required to be met in order to enable macro diversity handover between MS and a group of active base stations. The base stations involved in MDHO are required to: a. Be synchronized based on a common timing source (typically a GPS source); b. Have synchronized frame structures. That is the radio frames transmitted by the base stations involved in MDHO at any time arrive at the MS within the OFDM cyclic prefix (for CP = 1/8, the arrival variation is less than 11.42 us); C. Have the same RF carrier frequency; d. Use the same set of CIDs for the connections that are established with the MS; e. Send the same MAC/PHY PDUs to the MS; f. Share or transfer MS context that includes all information the MS and BS normally exchange during network entry, particularly authentication state, such that an MS authenticated/ registered with one of base stations from the Diversity Set is automatically authenticated/ registered with other base stations from the same Diversity Set. T