AN Master Information Block System Information Block Type I- System Infirmation FIGURE 4-29 System information acquisition flow graph [18] 4.6 3GPP LTE user equipment states and state transitions are very similar. Before a UE can camp on a cell, it needs to know if access is allowed in that cell. Thus, it would be very beneficial to know all access restrictions already at cell search phase. In order to support full mobility within the serving frequency layer, the UEs need to perform cell search peri- odically, and thus it is important that the information needed for cell search is readily available to reduce cell search latency and minimize UE power consumption. Before a UE can camp on a cell, it needs to know any access-related parameters in order to avoid camping on cells where access is restricted. Thus, prior to camping on a cell, a UE needs to know any cell access restriction parameters such as Tracking Area (TA) identity, cell barring status (UE is not allowed to camp on a barred cell), and cell reservation status, i.e., the UE needs to know whether the cell is barred or reserved in order to avoid camping on a barred cell. Also barring time might be needed in order to ensure that the UE does not have to poll barring time frequently from the system infor- mation. Another option is that barring status is also indicated in the neighbor cell list, and radio access limitation parameters, i.e., any radio condition parameters that limit the access to the cell [18]. When a UE has camped on a cell, it needs to continue measuring the neighboring cells in order to stay camped. In order for the UE to start mobility procedures, it needs to receive parameters such as reporting periods, reporting event parameters, time to trigger, etc. UEs in RRC_IDLE state need cell reselection parameters. The UEs in RRC_CONNECTED state need parameters of the neighbor cells for handover and for error recovery cases. Neighbor cell lists are needed to start neighbor cell measurements. UEs in different states may use different sets of neigh