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Content for  TS 38.304  Word version:  16.2.0

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5.2.4.7  Cell reselection parameters in system information broadcasts

5.2.4.7.0  General reselection parameters
Cell reselection parameters are broadcast in system information and are read from the serving cell as follows:
absThreshSS-BlocksConsolidation
This specifies the minimum threshold for beams which can be used for selection of the highest ranked cells, if rangeToBestCell is configured, and for beams used for derivation of cell measurement quantity. The parameter in SIB2 applies to the current serving frequency and the parameter in SIB4 applies to the corresponding inter-frequency.
cellReselectionPriority
This specifies the absolute priority for NR frequency or E-UTRAN frequency.
cellReselectionSubPriority
This specifies the fractional priority value added to cellReselectionPriority for NR frequency or E-UTRAN frequency.
combineRelaxedMeasCondition
This indicates when the UE needs to fulfil both low mobility criterion and not-at-cell-edge criterion to determine whether to relax measurement requirements.
highPriorityMeasRelax
This indicates whether measurement on higher priority frequency is allowed to be relaxed as specified in clause 5.2.4.9.0.
nrofSS-BlocksToAverage
This specifies the number of beams which can be used for selection of the highest ranked cell, if rangeToBestCell is configured, and the number of beams used for derivation of cell measurement quantity. The parameter in SIB2 applies to the current serving frequency and the parameter in SIB4 applies to the corresponding inter-frequency.
Qoffsets,n
This specifies the offset between the two cells.
Qoffsetfrequency
Frequency specific offset for equal priority NR frequencies.
Qhyst
This specifies the hysteresis value for ranking criteria.
Qoffsettemp
This specifies the additional offset to be used for cell selection and re-selection. It is temporarily used in case the RRC Connection Establishment fails on the cell as specified in TS 38.331.
Qqualmin
This specifies the minimum required quality level in the cell in dB.
Qrxlevmin
This specifies the minimum required Rx level in the cell in dBm.
Qrxlevminoffsetcell
This specifies the cell specific Rx level offset in dB to Qrxlevmin.
Qqualminoffsetcell
This specifies the cell specific quality level offset in dB to Qqualmin.
rangeToBestCell
This specifies the R value range which the cells whose R value is within the range can be a candidate for the highest ranked cell. It is configured in SIB2 and used for intra-frequency and equal priority inter-frequency cell reselection and among the cells on the highest priority frequency(ies) for inter-frequency cell reselection within NR.
SIntraSearchP
This specifies the Srxlev threshold (in dB) for intra-frequency measurements.
SIntraSearchQ
This specifies the Squal threshold (in dB) for intra-frequency measurements.
SnonIntraSearchP
This specifies the Srxlev threshold (in dB) for NR inter-frequency and inter-RAT measurements.
SnonIntraSearchQ
This specifies the Squal threshold (in dB) for NR inter-frequency and inter-RAT measurements.
SSearchDeltaP
This specifies the threshold (in dB) on Srxlev variation for relaxed measurement.
SSearchThresholdP
This specifies the Srxlev threshold (in dB) for relaxed measurement.
SSearchThresholdQ
This specifies the Squal threshold (in dB) for relaxed measurement.
TreselectionRAT
This specifies the cell reselection timer value. For each target NR frequency and for each RAT other than NR, a specific value for the cell reselection timer is defined, which is applicable when evaluating reselection within NR or towards other RAT (i.e. TreselectionRAT for NR is TreselectionNR, for E-UTRAN TreselectionEUTRA).
TreselectionNR
This specifies the cell reselection timer value TreselectionRAT for NR. The parameter can be set per NR frequency as specified in TS 38.331.
TreselectionEUTRA
This specifies the cell reselection timer value TreselectionRAT for E-UTRAN.
ThreshX, HighP
This specifies the Srxlev threshold (in dB) used by the UE when reselecting towards a higher priority RAT/ frequency than the current serving frequency. Each frequency of NR and E-UTRAN might have a specific threshold.
ThreshX, HighQ
This specifies the Squal threshold (in dB) used by the UE when reselecting towards a higher priority RAT/ frequency than the current serving frequency. Each frequency of NR and E-UTRAN might have a specific threshold.
ThreshX, LowP
This specifies the Srxlev threshold (in dB) used by the UE when reselecting towards a lower priority RAT/ frequency than the current serving frequency. Each frequency of NR and E-UTRAN might have a specific threshold.
ThreshX, LowQ
This specifies the Squal threshold (in dB) used by the UE when reselecting towards a lower priority RAT/ frequency than the current serving frequency. Each frequency of NR and E-UTRAN might have a specific threshold.
ThreshServing, LowP
This specifies the Srxlev threshold (in dB) used by the UE on the serving cell when reselecting towards a lower priority RAT/ frequency.
ThreshServing, LowQ
This specifies the Squal threshold (in dB) used by the UE on the serving cell when reselecting towards a lower priority RAT/ frequency.
TSearchDeltaP
This specifies the time period over which the Srxlev variation is evaluated for relaxed measurement.
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5.2.4.7.1  Speed dependent reselection parametersWord‑p. 28
Speed dependent reselection parameters are broadcast in system information and are read from the serving cell as follows:
TCRmax
This specifies the duration for evaluating allowed amount of cell reselection(s).
NCR_M
This specifies the maximum number of cell reselections to enter Medium-mobility state.
NCR_H
This specifies the maximum number of cell reselections to enter High-mobility state.
TCRmaxHyst
This specifies the additional time period before the UE can enter Normal-mobility state.
Speed dependent ScalingFactor for Qhyst
This specifies scaling factor for Qhyst in sf-High for High-mobility state and sf-Medium for Medium-mobility state.
Speed dependent ScalingFactor for TreselectionNR
This specifies scaling factor for TreselectionNR in sf-High for High-mobility state and sf-Medium for Medium-mobility state.
Speed dependent ScalingFactor for TreselectionEUTRA
This specifies scaling factor for TreselectionEUTRA in sf-High for High-mobility state and sf-Medium for Medium-mobility state.
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5.2.4.8  Inter-RAT Cell reselection in RRC_INACTIVE state

For UE in the RRC_INACTIVE state, upon cell reselection to another RAT, UE transitions from RRC_INACTIVE to RRC_IDLE and performs actions as specified in TS 38.331.

5.2.4.9  Relaxed measurement |R16|

5.2.4.9.0  Relaxed measurement rules
When the UE is required to perform measurements of intra-frequency or NR inter-frequencies or inter-RAT frequency cells according to the measurement rules in clause 5.2.4.2:
  • if lowMobilityEvaluation is configured and cellEdgeEvaluation is not configured; and
  • if the UE has performed normal intra-frequency, NR inter-frequency, or inter-RAT frequency measurements for at least TSearchDeltaP after (re-)selecting a new cell; and
  • if the relaxed measurement criterion in clause 5.2.4.9.1 is fulfilled for a period of TSearchDeltaP:
    • the UE may choose to perform relaxed measurements for intra-frequency cells according to relaxation methods in clauses 4.2.2.9 in TS 38.133;
    • if the serving cell fulfils Srxlev > SnonIntraSearchP and Squal > SnonIntraSearchQ:
    • for any NR inter-frequency or inter-RAT frequency of higher priority, if less than 1 hour has passed since measurements of corresponding frequency cell(s) for cell (re-)selection were last performed; and,
    • if highPriorityMeasRelax is configured with value true:
      • the UE may choose not to perform measurement on this frequency cell(s);
  • else (i.e. the serving cell fulfils Srxlev ≤ SnonIntraSearchP or Squal ≤ SnonIntraSearchQ):
    • the UE may choose to perform relaxed measurements for NR inter-frequency or inter-RAT frequency cells according to relaxation methods in clauses 4.2.2.10, and 4.2.2.11 in TS 38.133;
  • if cellEdgeEvaluation is configured and lowMobilityEvaluation is not configured; and
  • if the relaxed measurement criterion in clause 5.2.4.9.2 is fulfilled:
    • the UE may choose to perform relaxed measurements for intra-frequency cells according to relaxation methods in clauses 4.2.2.9 in TS 38.133;
    • if the serving cell fulfils Srxlev ≤ SnonIntraSearchP or Squal ≤ SnonIntraSearchQ:
    • the UE may choose to perform relaxed measurements for NR inter-frequency or inter-RAT frequency cells according to relaxation methods in clauses 4.2.2.10, and 4.2.2.11 in TS 38.133;
  • if both lowMobilityEvaluation and cellEdgeEvaluation are configured:
  • if the UE has performed normal intra-frequency, NR inter-frequency, or inter-RAT frequency measurements for at least TSearchDeltaP after (re-)selecting a new cell; and
  • if the relaxed measurement criterion in clause 5.2.4.9.1 is fulfilled for a period of TSearchDeltaP; and
  • if the relaxed measurement criterion in clause 5.2.4.9.2 is fulfilled:
    • for any intra-frequency, NR inter-frequency, or inter-RAT frequency, if less than 1 hour has passed since measurements of corresponding frequency cell(s) for cell (re-)selection were last performed:
      • the UE may choose not to perform measurement for measurements on this frequency cell(s);
  • else:
    • if the UE has performed normal intra-frequency, NR inter-frequency, or inter-RAT frequency measurements for at least TSearchDeltaP after (re-)selecting a new cell, and the relaxed measurement criterion in clause 5.2.4.9.1 is fulfilled for a period of TSearchDeltaP; or,
    • if the relaxed measurement criterion in clause 5.2.4.9.2 is fulfilled:
      • if combineRelaxedMeasCondition is not configured:
        • the UE may choose to perform relaxed measurements for intra-frequency, NR inter-frequency cells of equal or lower priority, or inter-RAT frequency cells of equal or lower priority according to relaxation methods in clauses 4.2.2.9, 4.2.2.10, and 4.2.2.11 in TS 38.133;
        • if the serving cell fulfils Srxlev ≤ SnonIntraSearchP or Squal ≤ SnonIntraSearchQ:
          • the UE may choose to perform relaxed measurement for NR inter-frequency cells of higher priority, or inter-RAT frequency cells of higher priority according to relaxation methods in clauses 4.2.2.10, and 4.2.2.11 in TS 38.133;
  • The above relaxed measurements and no measurement are not applicable for frequencies that are included in VarMeasIdleConfig, if configured and for which the UE supports dual connectivity or carrier aggregation between those frequencies and the frequency of the current serving cell.
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    5.2.4.9.1  Relaxed measurement criterion for UE with low mobilityWord‑p. 29
    The relaxed measurement criterion for UE with low mobility is fulfilled when:
    • (SrxlevRef - Srxlev) < SSearchDeltaP,
    Where:
    • Srxlev = current Srxlev value of the serving cell (dB).
    • SrxlevRef = reference Srxlev value of the serving cell (dB), set as follows:
      • After selecting or reselecting a new cell, or
      • If (Srxlev - SrxlevRef) > 0, or
      • If the relaxed measurement criterion has not been met for TSearchDeltaP:
        • The UE shall set the value of SrxlevRef to the current Srxlev value of the serving cell.
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    5.2.4.9.2  Relaxed measurement criterion for UE not at cell edgeWord‑p. 30
    The relaxed measurement criterion for UE not at cell edge is fulfilled when:
    • Srxlev > SSearchThresholdP, and,
    • Squal > SSearchThresholdQ, if SSearchThresholdQ is configured,
    Where:
    • Srxlev = current Srxlev value of the serving cell (dB).
    • Squal = current Squal value of the serving cell (dB).

    5.2.4.10  Cell reselection with CAG cells |R16|

    In addition to normal cell reselection, a UE may optionally use an autonomous search function to detect CAG cells on serving and non-serving frequencies. However UE shall follow the cell reselection criteria based on dedicated frequency priorities and only follow the autonomous cell search result if the result fulfils also the existing cell reselection criteria based on dedicated frequency priorities.

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