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Inter-RAT Cell Reselection Criteria 6.2.3.
When the criteria in Chapter 6.2.2 are fulfilled, the UE performs evaluation to execute cell reselection.
Since the MT8821C does not transmit Thresh
Serving, LowQ
of SystemInformationBlockType3, the UE performs cell
reselection when Srxlev for each serving cell and neighbour cell fulfils the following criteria.
Srxlev(serving cell) < Thresh
Serving, LowP
AND Srxlev(neighbour cell) > Thresh
X, LowP
Q
rxlevmin
,
RXLEV_ACCESS_MIN
*1: Setting x 2 = actual value (dB)
*2: UE applies the value of 0 dB
*3: Power Class 3 value
*4: Calculated by formula (-FLOOR(-2 x 10 x log10 Ec/Io) in units of 0.5 dB) defined in 3GPP TS36.304 5.2.4.5.
- Refer to the Cell Reselection Operation Procedure (6.2.5) for how to set Thresh
X, LowP
and Thresh
X, LowP
.
- These criteria are defined in 3GPP TS36.304 5.2.4.5 E-UTRAN Inter-frequency and inter-RAT Cell Reselection criteria.
- Refer to 3GPP TS36.331 for each message element of SystemInformationBlockType.
Intra-Frequency and Equal Inter-Frequency Cell Reselection Criteria 6.2.4.
When the criteria in Chapter 6.2.2 are fulfilled, the UE ranks cells to perform cell reselection. When the ranking Rn
of the following neighbour cell is greater than the ranking Rs of the serving cell, the UE performs cell reselection.
Rs = Qmeas,s + QHyst
Rn = Qmeas,n + Qoffset
RSRP measurement quantity used at cell reselection.
For intra-frequency: Equals to Qoffsets,n, if Qoffsets,n is valid, otherwise this equals to zero.
For inter-frequency: Equals to Qoffsets,n plus Qoffsetfrequency, if Qoffsets,n is valid, otherwise
this equals to Qoffsetfrequency.
The MT8821C sets QHyst of SystemInformationBlockType3 to dB0. For inter-frequency, only Qoffsetfrequency is used
because the MT8821C does not transmit Qoffsets,n.
- The Q
meas
setting procedure is the same as Q
rxlevmeas
described in 6.2.3 Inter-RAT Cell Reselection Criteria.
- Refer to 6.2.5 Cell Reselection Operation Procedure for how to set Qoffset.
- These criteria are defined in 3GPP TS36.304 5.2.4.6.