Idle Mode and Common Channel Behavior
The UE selects an acceptable cell on which to camp. In this case, candidate cells for cell selection are the ones used immediately before leaving the Connected mode. If no acceptable cell on that PLMN is found, the UE continues to search for an acceptable cell on any PLMN. •
When a UE moves from dedicated mode to state CELL_FACH or URA_PCH.
3.2.3
Cell Reselection Procedure
3.2.3.1
General When camping on a cell, the UE shall continuously search for a better cell according to the cell reselection criteria. In order to perform cell ranking, the UE measures the serving cell and neighbor cells listed in SIB11 according to the measurement rules described in Section 3.2.3.2 on page 14. All measured cells fulfilling the S-criteria as defined in Section 3.2.2 on page 12 are ranked according to the R-criteria described in Section 3.2.3.3 on page 16. If the UE finds a more suitable cell it reselects onto that cell and camps on it. Note that separate measurement rules and cell reselection criteria apply for the UE if HCS is used in the cell. This is further described in Section 3.2.4 on page 17. The high mobility state as specified in Reference [3] is not supported.
3.2.3.2
Measurement rules for cell reselection The decision about when intra-frequency measurements are performed is made using the sIntraSearch parameter in relation to Squal: •
If the Squal value is greater than the value for sIntraSearch, the UE does not need to perform intra-frequency measurements.
•
If the Squal value is less than or equal to the sIntraSearch value, the UE performs intra-frequency measurements.
•
If the value for sIntraSearch is not sent to the serving cell, the UE performs intra-frequency measurements.
The decision about when inter-frequency measurements are performed is made using the sInterSearch parameter in relation to Squal:
14
•
If the Squal value is greater than the value for sInterSearch, the UE does not need to perform inter-frequency measurements.
•
If the Squal value is less than or equal to the sInterSearch value, the UE performs inter-frequency measurements.
71/1553-HSD 101 02/6 Uen B 2008-03-14