Among many, in this post, we focus on signal level perspective.
Suitable cell is defined:
Srxlev > 0
Squal > 0
Then, questions arise: what is Srxlev and Squal?
Srxlev = Qrxlev_meas – Qrxlevmin – Pcompensation
Qrxlevmin is the minimum received signal level defined for the cell (broadcast information). Qrxlevmin ranges from -115dBm to -25dBm.
Here, we use RSCP (power measured by [...]
SIB 4
contains information on the cell selection and reselection parameters that the UE need to use in connected mode.
If SIB3 is not present it can be also be used for UEs in idle mode.
SIB 3
contains information on the cell selection and reselection parameters that the UE need to use in idle mode.
If SIB4 is not present it can be also be used for UEs in connected mode.
Two possible procedures:
1. initial cell selection
2. cell selection based on stored information
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1. Initial cell selection procedure occurs. That is, UE tries to find a cell (not necessarily the best cell, but a usable cell) for it to camp on the cell.
For a given frequency, UE does the below until it finds a working cell:
There are [...]
CPICH is the reference channel used for cell selection and handover procedures.
1. UE measures the received power of CPICH channel from different cells (called the Monitored Set) and selects the one with the highest one as the serving cell.
2. The decision to add or remove the Active Set depends on the ratio between the received [...]
