ma2000 1xRTT system. The mobility from HRPD to EUTRAN has no impact on EUTRAN. 11.6.1 MM Process A high level MM process starting from the transfer of information and finally to handover (from EUTRAN to HRPD) is discussed in this section. Mobility from HRPD to E-UTRAN has no impact on the E-UTRAN [9]. 11.6.1.1 System Information Transfer The HRPD system information block (SIB) is sent on the E-UTRAN BCCH which is monitored by UE during the RRC_IDLE and RRC_CONNECTED modes. This is done either to retrieve the HRPD system information for the preparation of cell reselection or handover from the E-UTRAN to HRPD system. The HRPD system information contains HRPD neighboring cell information, CDMA timing information, as well as information controlling the HRPD pre-registration. 11.6.1.2 Measurement Control Measurement Control takes place in idle mode or active mode: Idle Mode: The intra-3GPP inter-RAT idle mode measurement control is re-used to control the idle mode measurements on HRPD. UE makes measurements on the HRPD cells in RRC_IDLE mode to perform cell re-selection. Active Mode: In RRC_CONNECTED mode, the UE measures the strengths of each of the HRPD neighbor cells and reports them in an RRC message as directed by E-UTRAN. The network provides the required HRPD neighbor cell list information and measurement controls to the UE through dedicated RRC signaling. When needed the eNB is responsible for configuring and activating the HRPD measurements on the UE via the dedicated RRC signaling message. 11.6.1.3 Pre-registration to HRPD Procedures Pre-registration allows a UE to establish a presence with a HRPD system in advance of a cell re-selection or handover. E-UTRAN network instructs the UE whether the pre-registration is needed over broadcast channel and in a dedicated RRC message. The managing of pre-registration and re-registration is handled by HRPD upper layer. The UE should indicate if it is pre-registered when sending measurement reports on cdma2000 cells. 3 The S1 control plane interface (S1-MME) is defined 