4.2.
IDLE state mobility management
Idle state mobility is similar to that of UMTS. The UEs in the mobile environment that
are in IDLE state or DEREGISTERED state exhibit the IDLE state mobility. The pro-
cess is listed below that begins from the switching ON of UE:
4.2.1.
Public Land Mobile Network (PLMN) selection
UE scans for all RF channels in E-UTRA bands to find available PLMNs. On each car-
rier, the UE shall search for the strongest cell and read its system information. It then
reports the strong cells to the NAS as the list of high quality available PLMNs. The
quality scale for a high quality PLMN is that the measured Reference Signal Received
Power (RSRP) value is greater than or equal to -110 dBm. PLMN search can be opti-
mised by utilizing stored information from previous measurements such as carrier fre-
quencies, cell parameters etc. Once the PLMN selection is performed by UE, cell selec-
tion procedure is initiated. [12]
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