ix FID (4 bits) is flow identifier and is set to 0b0001. Matrix a response to a Feedback Polling based precoding Type (5 bits) denotes the MAC signaling header Feedback A-MAP IE requesting the quantized type. transmit correlation matrix when the BS Length (3 bits) indicates the length of the signaling has 2 or 4 transmit antennas. header in bytes. Entries of the quantized transmit correlation matrix. This header is used by the MS to send MIMO feedback FID (4 bits) is flow identifier and is set to 0b0001. Feedback only the wideband CQI, spatial rate, or Type (5 bits) denotes the MAC signaling header PMI information for any combinations of type. MIMO Feedback Modes 0, 4, 7. Length (3 bits) indicates the length of the signaling header in bytes. MFM bitmap (3 bits). Bitmap to indicate the MIMO Feedback Modes for which the MS is sending feedback. Wideband CQI (4 bits), Wideband STC rate (3 bits), or Wideband PMI (6 bits). Reserved 6.4 Mobility management and handover b. In association level 1, the ranging CDMA code and the rendezvous time, iv i.e., in which frame the ranging is performed, is negotiated via BS-to-BS signaling before the scanning period. The chosen CDMA code and the rendezvous time are reported to the MS in the MOB_SCN-RSP message. C. The association level 2 is similar to level 1, but the ranging parameters (e.g., power level) are reported to the serving BS, which collects the information from all neighbor BSs and then reports the information to the MS in a MOB_ASC-REP message. The hard handover is triggered if the RSSI of the serving BS becomes considerably low and there is another BS with a higher RSSI value in the neighborhood. In order to avoid a ping- pong effect, the RSSI of the target BS has to exceed a certain hysteresis margin, as well. If the MS is the initiator of handover, it will send a MOB_MSHO-REQ message to the serving BS, which responds with a MOB_BSHO-RSP message. On the other hand, if BS is the initiator of the handover, it will send a MOB_BSHO-REQ to the MS. The actual handover is ca