Editing My Intra-NR Notes (section)

=== 9.2.1.2	Cell Reselection ===

<span style="color:red">A UE in RRC_IDLE performs cell reselection.</span> The principles of the procedure are the following:
* Cell reselection is always based on CD-SSBs located on the synchronization raster (see clause 5.2.4).
* The UE makes measurements of attributes of the serving and neighbour cells to enable the reselection process:
** For the search and measurement of inter-frequency neighbouring cells, only the carrier frequencies need to be indicated.
* Cell reselection identifies the cell that the UE should camp on. It is based on cell reselection criteria which involves measurements of the serving and neighbour cells:
** Intra-frequency reselection is based on ranking of cells;
** Inter-frequency reselection is based on absolute priorities where a UE tries to camp on the highest priority frequency available;
** An NCL can be provided by the serving cell to handle specific cases for intra- and inter-frequency neighbouring cells;
** Exclude-lists can be provided to prevent the UE from reselecting to specific intra- and inter-frequency neighbouring cells;
** Allow-lists can be provided to request the UE to reselect to only specific intra- and inter-frequency neighbouring cells;
** Cell reselection can be speed dependent;
** Service specific prioritisation;
** Slice specific cell reselection information can be provided to facilitate the UE to reselect a cell that supports specific slices.

In multi-beam operations, the cell quality is derived amongst the beams corresponding to the same cell (see clause 9.2.4).