21.3.2c Cell reselection to inter-frequency cell using QoffsetSCPTM / Enhanced Coverage

36.523-13GPPEvolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Packet Core (EPC)Part 1: Protocol conformance specificationRelease 17TSUser Equipment (UE) conformance specification

21.3.2c.1 Test Purpose (TP)

(1)

with { Enhanced Coverage Capable UE in E-UTRAN RRC IDLE state on a cell broadcasting SIB15 and interested to receive a SC-PTM service }

ensure that {

when { a suitable inter-frequency neighbour cell is broadcasting SIB20 }

then { UE performs cell reselection to the inter-frequency cell using QoffsetSCPTM and starts SC-PTM reception }

}

21.3.2c.2 Conformance requirements

References: The conformance requirements covered in the present TC are specified in: TS 36.304, clause 5.2.4.6 and 5.2.4.7. Unless otherwise stated these are Rel-14 requirements.

[TS 36.304, clause 5.2.4.6]

The cell-ranking criterion Rs for serving cell and Rn for neighbouring cells is defined by:

where:

Qmeas

RSRP measurement quantity used in cell reselections.

Qoffset

For intra-frequency: Equals to Qoffsets,n, if Qoffsets,n is valid, otherwise this equals to zero.

For inter-frequency:

Except for NB-IoT, equals to Qoffsets,n plus Qoffsetfrequency, if Qoffsets,n is valid, otherwise this equals to Qoffsetfrequency.

For NB-IoT equals to QoffsetDedicatedfrequency for any frequency other than the frequency of the dedicated frequency offset, if QoffsetDedicatedfrequency is valid, otherwise this equals to Qoffsetfrequency (if QoffsetDedicatedfrequency is valid Qoffsetfrequency is not used).

Qoffsettemp

Offset temporarily applied to a cell as specified in [3]

QoffsetSCPTM

Offset temporarily applied to an SC-PTM frequency as specified below. The offset is applied to all cells on the SC-PTM frequency. If QoffsetSCPTM is valid, Qoffset for inter-frequency neighbour cells is not used.

If the NB-IoT UE or UE in enhanced coverage is capable of SC-PTM reception and is receiving or interested to receive an MBMS service and can only receive this MBMS service while camping on a frequency on which it is provided (SC-PTM frequency), the UE considers QoffsetSCPTM to be valid during the MBMS session [2] as long as the following condition is fulfilled:

Either:

– SIB15 (or SIB15-NB) of the serving cell indicates for that frequency one or more MBMS SAIs included in the MBMS User Service Description (USD) [22] of this service; or

– SIB15 (or SIB15-NB) is not broadcast in the serving cell and that frequency is included in the USD of this service.

NOTE: UE should search for a higher ranked cell on another frequency for cell reselection as soon as possible after the UE stops using QoffsetSCPTM.

The UE shall perform ranking of all cells that fulfil the cell selection criterion S, which is defined in 5.2.3.2 (5.2.3.2a for NB-IoT), but may exclude all CSG cells that are known by the UE not to be CSG member cells.

The cells shall be ranked according to the R criteria specified above, deriving Qmeas,n and Qmeas,s and calculating the R values using averaged RSRP results.

If a cell is ranked as the best cell the UE shall perform cell reselection to that cell. If this cell is found to be not-suitable, the UE shall behave according to subclause 5.2.4.4.

In all cases, the UE shall reselect the new cell, only if the following conditions are met:

– the new cell is better ranked than the serving cell during a time interval TreselectionRAT;

– more than 1 second has elapsed since the UE camped on the current serving cell.

When the UE uses infinite dBs for QoffsetSCPTM, the UE shall use QoffsetSCPTM zero and rank the cells on the SC-PTM frequency(ies) only first. If the UE cannot find a suitable cell on an SC-PTM frequency, the UE shall rank the cells on all frequencies.

[TS 36.331, clause 5.2.4.6a]

Ranking as defined in sub-clause 5.2.4.6 is applied for intra-frequency and inter-frequency cell reselection (irrespective of configured frequency priorities, if any) while the UE is in enhanced coverage.

[TS 36.331, clause 5.2.4.7]

Cell reselection parameters are broadcast in system information and are read from the serving cell as follows:

Qoffsetscptm

This specifies the offset to be used for cell re-selection for SC-PTM service reception for BL UE, UE in enhanced coverage and NB-IoT UE. The same offset is applicable to all frequencies providing MBMS services via SC-PTM.

21.3.2c.3 Test description

21.3.2c.3.1 Pre-test conditions

Same as test case 21.3.2 with the following differences:

– Cell 1 and Cell 3 support CE.

– In preamble, UE is in Registered, Idle mode, Test Mode Activated (State 2A-CE) according to [18] in Cell 1 (serving cell).

21.3.2c.3.2 Test procedure sequence

Same as test case 21.3.2.

21.3.2c.3.3 Specific message contents

Same as test case 21.3.2 with the following differences:

Table 21.3.2c.3.3-1: SystemInformationBlockType5 for Cell 1 (preamble and all later steps in Table 21.3.2.3.2-2)

Derivation path: 36.508 table 4.4.3.3-4

Information Element

Value/Remark

Comment

Condition

SystemInformationBlockType5 ::= SEQUENCE {

scptm-FreqOffset-r14

6 (12dB)

INTEGER (1..8)

}