20.25 Intersystem Cell Reselection

3GPP51.010-1Mobile Station (MS) conformance specificationPart 1: Conformance specificationTS

The default parameters for the GSM/GPRS cell, the accuracy of the MS signal measurements and tolerance of timers, are given in TS 51.010 section 20.22.

The default parameters and tolerances of the UTRAN cells are specified in TS 34.108.

20.25.1 Definition of system information messages

SYSTEM INFORMATION TYPE 3 REST OCTETS

  • SI2q indicated on BCCH Norm

SYSTEM INFORMATION TYPE 2QUATER

Information Element

Value/remark

< RR management Protocol Discriminator bit (4) >

‘0110’B

< Skip Indicator : bit (4) >

‘0000’B

< Message type : bit (8) >

‘0000 0111’B

< SI2 quarter Rest Octets >

< BA_IND : bit >

0

< 3G_BA_IND : bit >

0

< MP_CHANGE_MARK : bit >

0

< SI2quater _INDEX : bit (4) >

‘0000’B

< SI2quater_COUNT : bit (4) >

‘0000’B

0 | 1 < Measurement_Parameters Description >

0

0 | 1 < GPRS_Real Time Difference Description >

0

0 | 1 < GPSR_BSIC Description >

0

0 | 1 < GPRS_REPORT PRIORITY Description >

0

0 | 1 < GPRS_Measurement_Parameters Description >

0

0 | 1 < NC Measurement Parameters >

0

0 | 1 < extension length >

0

0 | 1 < 3G Neighbour Cell Description >

1

0 | 1 < Index_Start_3G : bit (7) >

0

0 | 1 < Absolute_Index_Start_EMR : bit (7) >

0

0 | 1 < UTRAN FDD Description >

1

0 | 1 < Bandwidth_FDD : bit (3) >

0

1 < Repeated UTRAN FDD Neighbour Cells > ** 0

1

0 < FDD-ARFCN : bit (14) >

0 See TS 34.108, clause 6.1.5, table 6.1.1

< FDD_Indic0 : bit >

0

< NR_OF_FDD_CELLS : bit (5) >

‘00001’B

< FDD_CELL_INFORMATION Field >

10 bits

Scrambling code according to TS 34.108, clause 6.1.4, Default settings for cell No.1

1 < Repeated UTRAN FDD Neighbour Cells > ** 0

0

0 | 1 < UTRAN TDD Description >

0

0 | 1 < 3G MEASUREMENT Parameters Description >

1

< Qsearch_I : bit (4) >

‘0111’B (Always)

< Qsearch_C_Initial : bit (1) >

0

0 | 1 < FDD_Qoffset : bit (4) >

1 ‘0000’B (Always select a cell if acceptable)

< FDD_REP_QUANT : bit (1) >

0

< FDD_MULTIRAT_REPORTING : bit (2) >

‘01’B

< FDD_Qmin : bit (3) >

’111’B (-12 dB)

0 | 1 < TDD_Qoffset : bit (4) >

0

0 | 1 < GPRS_3G_MEASUREMENT Parameters Description >

1

< Qsearch_P : bit (4) >

‘0111’B (Always)

< 3G_SEARCH_PRIO : bit >

0

0 | 1 < FDD_REP_QUANT : bit >

0

0 | 1 < FDD_REPORTING_OFFSET : bit (3) >

0

0 | 1 < TDD_MULTIRAT_REPORTING : bit (2) >

0

0 | 1 < TDD_REPORTING_OFFSET : bit (3) >

0

SYSTEM INFORMATION TYPE 2QUATER Instance 1

Information Element

Value/remark

< RR management Protocol Discriminator bit (4) >

‘0110’B

< Skip Indicator : bit (4) >

‘0000’B

< Message type : bit (8) >

‘0000 0111’B

< SI2 quarter Rest Octets >

< BA_IND : bit >

0

< 3G_BA_IND : bit >

0

< MP_CHANGE_MARK : bit >

0

< SI2quater _INDEX : bit (4) >

‘0000’B

< SI2quater_COUNT : bit (4) >

‘0001’B

0 | 1 < Measurement_Parameters Description >

0

0 | 1 < GPRS_Real Time Difference Description >

0

0 | 1 < GPSR_BSIC Description >

0

0 | 1 < GPRS_REPORT PRIORITY Description >

0

0 | 1 < GPRS_Measurement_Parameters Description >

0

0 | 1 < NC Measurement Parameters >

0

0 | 1 < extension length >

0

0 | 1 < 3G Neighbour Cell Description >

1

0 | 1 < Index_Start_3G : bit (7) >

0

0 | 1 < Absolute_Index_Start_EMR : bit (7) >

0

0 | 1 < UTRAN FDD Description >

1

0 | 1 < Bandwidth_FDD : bit (3) >

0

1 < Repeated UTRAN FDD Neighbour Cells > ** 0

1

0 < FDD-ARFCN : bit (14) >

0 See TS 34.108, clause 6.1.5, table 6.1.1

< FDD_Indic0 : bit >

0

< NR_OF_FDD_CELLS : bit (5) >

‘00001’B

< FDD_CELL_INFORMATION Field >

10 bits

Scrambling code according to TS 34.108, clause 6.1.4, Default settings for cell No.1

1 < Repeated UTRAN FDD Neighbour Cells > ** 0

0

0 | 1 < UTRAN TDD Description >

0

0 | 1 < 3G MEASUREMENT Parameters Description >

1

< Qsearch_I : bit (4) >

‘0111’B (Always)

< Qsearch_C_Initial : bit (1) >

0

0 | 1 < FDD_Qoffset : bit (4) >

1 ‘0000’B (Always select a cell if acceptable)

< FDD_REP_QUANT : bit (1) >

0

< FDD_MULTIRAT_REPORTING : bit (2) >

‘01’B

< FDD_Qmin : bit (3) >

’111’B (-12 dB)

0 | 1 < TDD_Qoffset : bit (4) >

0

0 | 1 < GPRS_3G_MEASUREMENT Parameters Description >

1

< Qsearch_P : bit (4) >

‘0111’B (Always)

< 3G_SEARCH_PRIO : bit >

0

0 | 1 < FDD_REP_QUANT : bit >

0

0 | 1 < FDD_REPORTING_OFFSET : bit (3) >

0

0 | 1 < TDD_MULTIRAT_REPORTING : bit (2) >

0

0 | 1 < TDD_REPORTING_OFFSET : bit (3) >

0

0 | 1 < 3G Additional Measurement Parameters Description >

1

0 | 1 < FDD_REPORTING_OFFSET : bit (3) >

’000’B (0 dB)

0 | 1 < FDD_RSCPmin : bit (4) >

’0000’B (-114 dBm)

0 | 1 <Additions in Rel-6

0

0 | 1 <Additions in Rel-7

0

0 | 1 <Additions in Rel-8

1

0 | 1 <Additions in Rel-8

1

0 | 1 < Priority and E-UTRAN Parameters Description >

1

0 | 1 < Serving Cell Priority Parameters Description >

1

< GERAN_PRIORITY : bit(3) >

‘011’

< THRESH_Priority_Search : bit(4) >

‘1111’ (Always)

< THRESH_GSM_low : bit(4) >

‘1110’ ( 28dB )

< H_PRIO : bit(2) >

‘00’ (rule disabled)

< T_Reselection : bit(2) >;

‘00’ (5 sec)

0 | 1 < 3G Priority Parameters Description >

1

< UTRAN_Start : bit >

1

< UTRAN_Stop : bit >

0

1 < DEFAULT_UTRAN_PRIORITY : bit(3)

5

DEFAULT_THRESH_UTRAN: bit(5)

’01010’B ( 20dB )

DEFAULT_UTRAN_QRXLEVMIN: bit(5) >

’00000’B (-119 dBm)

1 < Repeated UTRAN FDD Neighbour Cells > ** 0

0

0 | 1 < E-UTRAN Parameters Description >

0

0 | 1 < 3G CSG Description >

0

0 | 1 < E-UTRAN CSG Description >

0

SYSTEM INFORMATION TYPE 2QUATER Instance 2

Information Element

Value/remark

< RR management Protocol Discriminator bit (4) >

‘0110’B

< Skip Indicator : bit (4) >

‘0000’B

< Message type : bit (8) >

‘0000 0111’B

< SI2 quarter Rest Octets >

< BA_IND : bit >

0

< 3G_BA_IND : bit >

0

< MP_CHANGE_MARK : bit >

0

< SI2quater _INDEX : bit (4) >

‘0001’B

< SI2quater_COUNT : bit (4) >

‘0001’B

0 | 1 < Measurement_Parameters Description >

0

0 | 1 < GPRS_Real Time Difference Description >

0

0 | 1 < GPSR_BSIC Description >

0

0 | 1 < GPRS_REPORT PRIORITY Description >

0

0 | 1 < GPRS_Measurement_Parameters Description >

0

0 | 1 < NC Measurement Parameters >

0

0 | 1 < extension length >

0

0 | 1 < 3G Neighbour Cell Description >

0

0 | 1 < 3G MEASUREMENT Parameters Description >

0

0 | 1 < GPRS_3G_MEASUREMENT Parameters Description >

0

0 | 1 <Additions in Rel-5

0

0 | 1 <Additions in Rel-6

0

0 | 1 <Additions in Rel-7

0

0 | 1 <Additions in Rel-8

1

0 | 1 < Priority and E-UTRAN Parameters Description >

1

0 | 1 < Serving Cell Priority Parameters Description >

0

0 | 1 < 3G Priority Parameters Description >

1

< UTRAN_Start : bit >

0

< UTRAN_Stop : bit >

1

{ 0 | 1 < DEFAULT_UTRAN_PRIORITY : bit(3) >

0

1 < Repeated UTRAN FDD Neighbour Cells > ** 0

1

1 < UTRAN_FREQUENCY_INDEX > ** 0

1

< UTRAN_FREQUENCY_INDEX : bit (5) >

’0000’B

1 < UTRAN_FREQUENCY_INDEX > ** 0

0

0 | 1 < UTRAN_PRIORITY : bit(3) >

’101’B

< THRESH_UTRAN_high : bit(5) >

’01111’B ( 30dB )

0 | 1 < THRESH_UTRAN_low : bit(5) >

0 ( Default value )

0 | 1 < UTRAN_QRXLEVMIN : bit(5) >

’00010’B (-115 dBm)

1 < Repeated UTRAN FDD Neighbour Cells > ** 0

0

0 | 1 < E-UTRAN Parameters Description >

0

0 | 1 < 3G CSG Description >

0

0 | 1 < E-UTRAN CSG Description >

0

20.25.2 Intersystem Cell Reselection/Idle Mode/FDD_Qmin

20.25.2.1 Conformance requirement

If the 3G Cell Reselection list includes UTRAN frequencies, the MS shall, at least every 5 s update the value RLA_C for the serving cell and each of the at least 6 strongest non-serving GSM cells.

The MS shall then reselect a suitable (see TS 25.304) UTRAN cell if its measured RSCP value exceeds the value of RLA_C for the serving cell and all of the suitable (see 3GPP TS 03.22) non-serving GSM cells by the value XXX_Qoffset for a period of 5 seconds and, for FDD, the UTRAN cells measured Ec/No value is equal or greater than the value FDD_Qmin. In case of a cell reselection occurring within the previous 15 seconds, XXX_Qoffset is increased by 5 dB.

Table 1: Radio sub‑system link control parameters

Parameter name

Description

Range

Bits

Channel

FDD_Qmin

A minimum threshold for Ec/No for UTRAN FDD cell re-selection,
0= -20dB, 1= -6dB, 2= -18dB, 3= -8dB, 4= -16dB, 5= -10dB, 6= -14dB, 7= -12dB.

Default value= -12dB.

0-7

3

BCCH D/L

References:

3GPP TS 05.08, subclause 6.6.5 and 9

20.25.2.2 Test purpose

To verify that the MS uses the FDD_Qmin parameter at cell re-selection from GSM to UTRAN while in GSM Idle Mode.

20.25.2.3 Method of test

Initial conditions

Parameter

Cell 1

Cell 2

Carrier1

Carrier2

Channel Type carried

BCCH

BCH

Signal Level (dBm)

-50

Off to -48

Ec/No (dB)

-6>dB>-16

NOTE 1: MS is IMSI updated on Cell 1.

NOTE 2: Carrier 1 is the BCCH carrier, GPRS not present.

NOTE 3: Carrier 2 is the UTRAN FDD cell configured according to TS 34.108, clause 6.1.4, Default settings for cell No.1

NOTE 4: Serving Cell Parameters are coded and transmitted on the specified Channel Type

NOTE 5: Carriers should have a relative accuracy of ±2 dB.

NOTE 6: When executing the test in FDD band II or FDD band VIII carrier 2 shall use the high range UARFCN, defined in TS 3GPP 34.108 clause 5.1.1. This is to avoid the FDD band overlapping with the GSM band under test.

SYSTEM INFORMATION TYPE 3 REST OCTETS

  • GPRS not indicated

SYSTEM INFORMATION TYPE 4 REST OCTETS

  • GPRS not indicated

SYSTEM INFORMATION TYPE 2QUATER

Information Element

Value/remark

< MP_CHANGE_MARK : bit (1)>

0

< FDD_Qmin : bit (3) >

’001’B (-6 dB)

Test procedure

The MS is camping on the GSM cell and has received a 3G Neighbour Cell list is in the 3G_NEIGHBOUR CELL description in System Information Type 2quater. The FDD_Qmin in the 3G_MEASUREMENT_PARAMETERS description is set to –6 dB.

It is verified for 30 sec that no Cell Reselection to the UTRAN cell is performed.

System Information 2quater is updated with FDD_Qmin in the 3G_MEASUREMENT_PARAMETERS description set to -16 dB.

It is verified that a Cell Reselection to UTRAN is performed within 45 secs when UE receives and acts on revised SI2quater and the UTRAN cell Ec/No gets greater than FDD_Qmin. (45 secs = 30 secs period of SI reading + 5 secs for UE to receive and decode SI2quater +2*5sec, where 5 sec is the maximum time between 2 consecutive UTRAN measurements.)

Maximum duration of the test

2 minutes

Expected sequence

Step

Direction

Message

Comments

1

SS

Carrier 2 is activated with -6>Ec/No>-16 (dB)

2

SS <->MS

Verify that no cell reselection is performed to Carrier 2 for 30 sec.

3

SS

SYSTEM INFORMATION TYPE 2QUATER

See specific contents below.

4

MS -> SS

RRC CONNECTION REQUEST

Verify that the MS reselects to Carrier 2 within 45 secs from Step 3.

Establishment cause shall be “interRAT-CellReselection”

Specific message contents

SYSTEM INFORMATION TYPE 2QUATER in Step 3

Information Element

Value/remark

< MP_CHANGE_MARK : bit (1)>

1

< FDD_Qmin : bit (3) >

’100’B (-16 dB)

20.25.3 Intersystem Cell Reselection/Idle Mode/FDD_Qoffset

20.25.3.1 Conformance requirement

If the 3G Cell Reselection list includes UTRAN frequencies, the MS shall, at least every 5 s update the value RLA_C for the serving cell and each of the at least 6 strongest non-serving GSM cells.

The MS shall then reselect a suitable (see TS 25.304) UTRAN cell if its measured RSCP value exceeds the value of RLA_C for the serving cell and all of the suitable (see 3GPP TS 03.22) non-serving GSM cells by the value XXX_Qoffset for a period of 5 seconds and, for FDD, the UTRAN cells measured Ec/No value is equal or greater than the value FDD_Qmin. In case of a cell reselection occurring within the previous 15 seconds, XXX_Qoffset is increased by 5 dB.

Table 1: Radio sub‑system link control parameters

Parameter name

Description

Range

Bits

Channel

FDD_Qoffset

Applies an offset to RLA_C for cell re‑selection to access technology/mode FDD
0 = –  (always select a cell if acceptable),
1 = -28 dB, 2 = -24 dB, … , 15 = 28 dB.
Default value = 0 dB.

0-15

4

BCCH D/L

Power Spectral Density: The units of Power Spectral Density (PSD) are extensively used in this document. PSD is a function of power versus frequency and when integrated across a given bandwidth, the function represents the mean power in such a bandwidth.

References:

3GPP TS 05.08, subclause 6.6.5 and 9; TS 25.101 subclause 3.1.

20.25.3.2 Test purpose

To verify that the MS uses the FDD_Qoffset parameter at cell re-selection from GSM/GPRS to UTRAN while in Idle Mode.

20.25.3.3 Method of test

Initial conditions

Parameter

Unit

Cell 1

(GSM)

Test Channel

1

RF Signal Level

dBm

-75

RXLEV_ACCESS_MIN

dBm

-100

FDD_Qoffset

dB

20

Parameter

Unit

Cell 2

(UTRAN)

Test Channel

1

CPICH_Ec (FDD)

dBm / 3.84 MHz

OFF to -62 to -48

NOTE 1: MS is IMSI updated on Cell 1.

NOTE 2: Carrier 1 is the BCCH carrier, GPRS not present.

NOTE 3: Carrier 2 is the UTRAN FDD cell configured according to TS 34.108, clause 6.1.4, Default settings for cell No.1

NOTE 4: Serving Cell Parameters are coded and transmitted on the specified Channel Type.

NOTE 5: Carriers should have a relative accuracy of ±3 dB.

NOTE 6: When executing the test in FDD band II or FDD band VIII carrier 2 shall use the high range UARFCN, defined in TS 3GPP 34.108 clause 5.1.1. This is to avoid the FDD band overlapping with the GSM band under test.

SYSTEM INFORMATION TYPE 3 REST OCTETS

  • SI2q indicated on BCCH extended
  • GPRS not indicated

SYSTEM INFORMATION TYPE 4 REST OCTETS

  • GPRS not indicated

SYSTEM INFORMATION TYPE 2QUATER

Information Element

Value/remark

0 | 1 < FDD_Qoffset : bit (4) >

1 ‘1101’B (20 dB)

Test procedure

The MS is camping on the GSM cell and has received a 3G Neighbour Cell list is in the 3G_NEIGHBOUR CELL description in System Information Type 2quater. The FDD_Qoffset in the 3G_MEASUREMENT_PARAMETERS description is set to 20 dB.

It is verified for 30 sec that no Cell Reselection to the UTRAN cell is performed.

The UTRAN cell CPICH Ec is increased to –50 dBm / 3.84 MHz and therefore, The mean power of the CPICH Ec integrated across 3.84 MHz bandwidth is –50dBm

It is verified that a Cell Reselection to UTRAN CPICH Ecis performed within 15.4 sec when the UTRAN cell mean power of the CPICH Ec integrated across 3.84 MHz gets greater than the GSM cell RLA_C + FDD_Qoffset. (15.4 sec = 2*5sec, where 5 sec is the maximum time between 2 consecutive UTRAN measurements, with 4 seconds to read the SIBs plus 10% tolerance overall)

Maximum duration of the test

2 minutes

Expected sequence

Step

Direction

Message

Comments

1

SS

Carrier 2 is activated

2

SS

Verify that the MS does not reselect to Carrier 2 for 30 sec.

3

SS

Increase power of Carrier 2 to –50 dBm.

4

MS -> SS

RRC CONNECTION REQUEST

Verify that the MS reselects to Carrier 2 within 15.4 sec from Step 3.

Establishment cause shall be “interRAT-CellReselection”

Specific message contents

None

20.25.3a Intersystem Cell Reselection/Idle Mode/TDD_Qoffset (1.28Mcps TDD)

20.25.3a.1 Conformance requirement

If the 3G Cell Reselection list includes UTRAN frequencies, the MS shall, at least every 5 s update the value RLA_C for the serving cell and each of the at least 6 strongest non-serving GSM cells.

The MS shall then reselect a suitable (see TS 25.304) UTRAN cell if its measured RSCP value exceeds the value of TDD_ Qoffset for a period of 5 seconds.

Table 1: Radio sub‑system link control parameters

Parameter name

Description

Range

Bits

Channel

TDD_Qoffset

An absolute threshold of RSCP for UTRAN TDD cell re-selection,

0 = -105dBm, 1 = -102dBm, 2=-99dBm, 3 = -96dBm, 4 = -93dBm, 5 = -90dBm, 6 = -87dBm, 7 = -84dBm, 8 = -81dBm, 9 = -78dBm, 10 = -75dBm, 11 = -72dBm, 12 = -69dBm, 13 = -66dBm, 14 = -63dBm, 15 = -60dBm.

Default value = -90dBm.

0-15

4

BCCH D/L

References:

3GPP TS 05.08, subclause 6.6.5 and 9; TS 25.101 subclause 3.1.

20.25.3a.2 Test purpose

To verify that the MS uses the TDD_Qoffset parameter at cell re-selection from GSM/GPRS to UTRAN while in Idle Mode.

20.25.3a.3 Method of test

Initial conditions

Parameter

Unit

Cell 1

(GSM)

Test Channel

1

RF Signal Level

dBm

-75

RXLEV_ACCESS_MIN

dBm

-100

Qsearch_I

dBm

7 (always)

TDD_Qoffset

dBm

-90

Parameter

Unit

Cell 2

(UTRAN)

Test Channel

1

PCCPCH RSCP (TDD)

dBm / 1.28 MHz

OFF to -99 to -77

NOTE 1: MS is IMSI updated on Cell 1.

NOTE 2: Carrier 1 is the BCCH carrier, GPRS not present.

NOTE 3: Carrier 2 is the UTRAN TDD cell configured according to TS 34.108, clause 6.1.4, Default settings for cell No.1

NOTE 4: Serving Cell Parameters are coded and transmitted on the specified Channel Type.

NOTE 5: Carriers should have a relative accuracy of ±3 dB.

SYSTEM INFORMATION TYPE 3 REST OCTETS

– SI2q indicated on BCCH extended

– GPRS not indicated

SYSTEM INFORMATION TYPE 4 REST OCTETS

– GPRS not indicated

SYSTEM INFORMATION TYPE 2QUATER

Information Element

Value/remark

0 | 1 < TDD_Qoffset : bit (4) >

1 ‘0101’B (-90 dBm)

Test procedure

The MS is camping on the GSM cell and has received a 3G Neighbour Cell list is in the 3G_NEIGHBOUR CELL description in System Information Type 2quater. The TDD_Qoffset in the 3G_MEASUREMENT_PARAMETERS description is set to -90 dBm.

It is verified for 30 sec that no Cell Reselection to the UTRAN cell is performed.

The UTRAN cell PCCPCH RSCP is increased to –77 dBm / 1.28 MHz and therefore, The mean power of the PCCPCH RSCP integrated across 1.28 MHz bandwidth is –77dBm

It is verified that a Cell Reselection to UTRAN is performed within 15.4 sec when the UTRAN cell mean power of the PCCPCH RSCP integrated across 1.28 MHz gets greater than TDD_Qoffset. (15.4 sec = 2*5sec, where 5 sec is the maximum time between 2 consecutive UTRAN measurements, with 4 seconds to read the SIBs plus 10% tolerance overall)

Maximum duration of the test

2 minutes

Expected sequence

Step

Direction

Message

Comments

1

SS

Carrier 2 is activated

2

SS

Verify that the MS does not reselect to Carrier 2 for 30 sec.

3

SS

Increase power of Carrier 2 to –77 dBm.

4

MS -> SS

RRC CONNECTION REQUEST

Verify that the MS reselects to Carrier 2 within 15.4 sec from Step 3.

Establishment cause shall be “interRAT-CellReselection”

Specific message contents

None

20.25.4 Intersystem Cell Reselection/Idle Mode/Qsearch_I

20.25.4.1 Conformance requirement

If the 3G Cell Reselection list includes UTRAN frequencies, the MS shall, at least every 5 s update the value RLA_C for the serving cell and each of the at least 6 strongest non-serving GSM cells.

For FDD, the MS shall then reselect a suitable (see TS 25.304) UTRAN cell if its measured RSCP value exceeds the value of RLA_C for the serving cell and all of the suitable (see 3GPP TS 03.22) non-serving GSM cells by the value FDD_Qoffset for a period of 5 seconds and the UTRAN cells measured Ec/No value is equal or greater than the value FDD_Qmin. In case of a cell reselection occurring within the previous 15 seconds, FDD_Qoffset is increased by 5 dB.

For TDD, the MS shall then reselect a suitable (see TS 25.304) UTRAN cell if its measured RSCP value exceeds the value of TDD_ Qoffset for a period of 5 seconds.

Table 1a: Radio sub‑system link control parameters for FDD

Parameter name

Description

Range

Bits

Channel

Qsearch_I

Search for 3G cells if signal level is below (0‑7) or above (8‑15) threshold
0 = – 98 dBm, 1 = – 94 dBm, … ,
6 = – 74 dBm, 7 =  (always)
8 = – 78 dBm, 9 = – 74 dBm, … ,
14 = – 54 dBm, 15 =  (never).
Default value =  (never).

0-15

4

BCCH D/L

Table 1b: Radio sub‑system link control parameters for TDD

Parameter name

Description

Range

Bits

Channel

Qsearch_I

Search for 3G cells if signal level is below (0‑7) or above (8‑15) threshold
0 = – 98 dBm, 1 = – 94 dBm, … ,
6 = – 74 dBm, 7 =  (always)
8 = – 90 dBm, 9 = – 86 dBm, … ,
14 = – 66 dBm, 15 =  (never).
Default value =  (never).

0-15

4

BCCH D/L

References:

3GPP TS 05.08, subclause 6.6.5 and 9

20.25.4.2 Test purpose

To verify that the MS uses the Qsearch_I parameter at cell re-selection from GSM to UTRAN while in Idle Mode.

20.25.4.3 Method of test

Initial conditions

For MS supporting FDD:

Parameter

Unit

Cell 1

(GSM)

Test Channel

1

RF Signal Level

dBm

-60 to -77

RXLEV_ACCESS_MIN

dBm

-100

MP_CHANGE_MARK

0

Qsearch_I

15 to 6

Parameter

Unit

Cell 2

(UTRAN)

Test Channel

1

CPICH_Ec (FDD)

dBm / 3.84 MHz

OFF to -50

For MS supporting TDD:

Parameter

Unit

Cell 1

(GSM)

Test Channel

1

RF Signal Level

dBm

-77 to -71

RXLEV_ACCESS_MIN

dBm

-100

MP_CHANGE_MARK

0

Qsearch_I

15 (never) to 12 (-74dBm)

Parameter

Unit

Cell 2

(UTRAN)

Test Channel

1

PCCPCH_RSCP (TDD)

dBm / 1.28 MHz

OFF to -50

NOTE 1: MS is IMSI attached on Cell 1.
If MS supports GPRS, then MS is GPRS attached on cell 1.

NOTE 2: Carrier 1 is the BCCH carrier, PBCCH not present, NC0.

NOTE 3: Carrier 2 is either the UTRAN FDD cell or the UTRAN TDD cell configured according to TS 34.108, clause 6.1.4, Default settings for cell No.1

NOTE 4: Serving Cell Parameters are coded and transmitted on the specified Channel Type

NOTE 5: Carriers should have a relative accuracy of ±3 dB.

SYSTEM INFORMATION TYPE 2QUATER

Information Element

Value/remark

< Qsearch_I : bit (4) >

‘1111’B (Never)

< Qsearch_P : bit (4) >

‘0111’B (Always)

Specific PICS statements:

  • Support of UTRAN FDD (TSPC_Type_UTRAN_FDD)
  • Support of UTRAN TDD (TSPC_Type_UTRAN_TDD)

Test procedure

The MS is camping on the GSM cell and has received a 3G Neighbour Cell list is in the 3G_NEIGHBOUR CELL description in System Information Type 2quater. Qsearch_I in the 3G_MEASUREMENT_PARAMETERS description indicates that no 3G measurements shall be performed.

It is verified for 30 sec that no Cell Reselection to the UTRAN cell is performed.

For FDD, the SS broadcast a new System Information Type 2quater with an updated Qsearch_I indicating that 3G measurements shall be performed when the strongest GSM cell RLA_C is below –74 dBm.

For TDD, The SS broadcast a new System Information Type 2quater with an updated Qsearch_I indicating that 3G measurements shall be performed when the strongest GSM cell RLA_C is above –74 dBm.

It is verified for 65 sec that no Cell Reselection to the UTRAN cell is performed. (Maximum 30 sec for SI reading + 5 sec for System Information 2quater reading + 30 sec to find the UTRAN.)

For FDD, the GSM cell RLA_C is decreased to –77 dBm.

For TDD, the GSM cell RLA_C is increased to –71 dBm.

It is verified that a Cell Reselection to UTRAN is performed within 30 sec.

Maximum duration of the test

4 minutes

Expected sequence

This sequence is performed for each UTRAN mode the MS supports.

Step

Direction

Message

Comments

1

SS

Carrier 2 is activated on –50 dBm

2

SS

Verify that no cell reselection is performed to Carrier 2 for 30 sec.

3

SS

SYSTEM INFORMATION 2QUATER

3a

SS

SYSTEM INFORMATION TYPE 13

See specific contents below.

4

SS

Verify that no cell reselection is performed to Carrier 2 for 65 sec.

5

SS

For FDD, reduce power of Carrier 1 to –77 dBm.

For TDD, increase power of Carrier 1 to –71 dBm.

6

MS -> SS

RRC CONNECTION REQUEST

Verify that the MS reselects to Carrier 2 within 30 sec.

Establishment cause shall be “interRAT-CellReselection”

Specific message contents

SYSTEM INFORMATION 2QUATER in Step 3

< MP_CHANGE_MARK : bit >

1

0 | 1 < 3G_MEASUREMENT Parameters Description >

0

< Qsearch_I : bit (4) >

For FDD:

‘0110’B (-74 dBm)

For TDD:

‘1100’B (above -74 dBm)

< Qsearch_C_Initial : bit (1) >

0

0 | 1 < FDD_Qoffset : bit (4) >

0

0 | 1 < TDD_Qoffset : bit (4) >

0

SYSTEM INFORMATION Type 13 in Step 3a

Information Element

Value/remark

< BCCH_CHANGE_MARK : bit (3) >

‘001’B

< SI_CHANGE_FIELD : bit (4) >

‘0010’B (Update of SI2, SI2 bis or SI2 ter message or any instance of SI2quater messages )

20.25.5 Intersystem Cell Reselection / Idle Mode / High Priority

20.25.5.1 Conformance requirement

If the 3G Cell Reselection list or the E-UTRAN Neighbour Cell list include frequencies of other radio access technologies, the MS shall, at least every 5 s update the value RLA_C for the serving cell and each of the at least 6 strongest non serving GSM cells.

The MS shall then reselect a suitable (see 3GPP TS 25.304 for UTRAN and 3GPP TS 36.304 for E-UTRAN) cell of another radio access technology if the criteria below are satisfied. S_non-serving_XXX is the measurement quantity of a non-serving inter-RAT cell and XXX indicates the other radio access technology/mode and is defined as follows:

– for a UTRAN cell, is the measured RSCP value for the cell minus UTRAN_QRXLEVMIN for the cell’s frequency;

Cell reselection to a cell of another inter-RAT frequency shall be performed if any of the conditions below (to be evaluated in the order shown) is satisfied:

– The S_non-serving_XXX of one or more cells of a higher priority inter-RAT frequency is greater than THRESH_XXX_high during a time interval T_reselection; in that case, the mobile station shall consider the cells for reselection in decreasing order of priority and, for cells of the same priority, in decreasing order of S_non-serving_XXX, and reselect the first cell that satisfies the conditions above;

A UTRAN FDD cell shall only be reselected if, in addition to the criteria above, its measured Ec/No value is equal to or greater than FDD_Qmin – FDD_Qmin_Offset.

References:

3GPP TS 45.008, subclause 6.6.6

20.25.5.2 Test purpose

To verify that the MS uses the priority information and performs cell re-selection to High priority UTRAN cell while in Idle Mode.

20.25.5.3 Method of test

Initial conditions

Parameter

Cell 1

Cell 2

Carrier1

Carrier2

Channel Type carried

BCCH

BCH

Signal Level (dBm)

-50

Off to -60

Ec/No (dB)

-6dB

NOTE 1: MS is GPRS attached on Cell 1.

NOTE 2: Carrier 1 is the BCCH carrier, NC0.

NOTE 3: Carrier 2 is the UTRAN FDD cell configured according to TS 34.108, clause 6.1.4, Default settings for cell No.1

NOTE 4: Serving Cell Parameters are coded and transmitted on the specified Channel Type

NOTE 5: Carriers should have a relative accuracy of ±3 dB.

NOTE 6: SYSTEM INFORMATION TYPE 2QUATER Instance1 and Instance2 as per 20.25.1.

Test procedure

The MS is GPRS attached and has received a 3G Neighbour Cell description in System Information Type 2quater message, along with priority information.

Update the Carrier 2, power level as per the initial conditions

It is verified that a Cell Reselection to UTRAN is performed within 30 sec.

Maximum duration of the test

5 minutes

Expected sequence

Step

Direction

Message

Comments

1

SS

Carrier 2 is activated with Ec/No = -6 (dB) and power level -60(dBm)

2

MS -> SS

RRC CONNECTION REQUEST

Verify that the MS reselects to Carrier 2 within 30 secs from Step 1.

Establishment cause shall be “interRAT-CellReselection”

20.25.6 Intersystem Cell Reselection / Idle Mode / Low Priority

20.25.6.1 Conformance requirement

If the 3G Cell Reselection list or the E-UTRAN Neighbour Cell list include frequencies of other radio access technologies, the MS shall, at least every 5 s update the value RLA_C for the serving cell and each of the at least 6 strongest non serving GSM cells.

The MS shall then reselect a suitable (see 3GPP TS 25.304 for UTRAN and 3GPP TS 36.304 for E-UTRAN) cell of another radio access technology if the criteria below are satisfied. S_non-serving_XXX is the measurement quantity of a non-serving inter-RAT cell and XXX indicates the other radio access technology/mode and is defined as follows:

– for a UTRAN cell, is the measured RSCP value for the cell minus UTRAN_QRXLEVMIN for the cell’s frequency;

For a GSM cell, S_GSM is defined as the C1 value for the cell (see subclause 6.4);

Cell reselection to a cell of another inter-RAT frequency shall be performed if any of the conditions below (to be evaluated in the order shown) is satisfied:

– The S_non-serving_XXX of one or more cells of a higher priority inter-RAT frequency is greater than THRESH_XXX_high during a time interval T_reselection; in that case, the mobile station shall consider the cells for reselection in decreasing order of priority and, for cells of the same priority, in decreasing order of S_non-serving_XXX, and reselect the first cell that satisfies the conditions above;

– The value of S_GSM is lower than THRESH_GSM_low for the serving cell and all measured GSM cells during a time interval T_reselection; in this case, the mobile station shall consider for reselection the inter-RAT cells in the following order, and reselect the first one that satisfies the following criteria:

– cells of a lower priority inter-RAT frequency whose S_non-serving_XXX is greater than THRESH_XXX_low during a time interval T_reselection; these cells shall be considered in decreasing order of priority and, for cells of the same priority, in decreasing order of S_non-serving_XXX;

A UTRAN FDD cell shall only be reselected if, in addition to the criteria above, its measured Ec/No value is equal to or greater than FDD_Qmin – FDD_Qmin_Offset.

References:

3GPP TS 45.008, subclause 6.6.6

20.25.6.2 Test purpose

To verify that the MS uses the priority information and performs cell re-selection to Low priority UTRAN cell while in Idle Mode.

20.25.6.3 Method of test

Initial conditions

Parameter

Cell 1

Cell 2

Carrier1

Carrier2

Channel Type carried

BCCH

BCH

Signal Level (dBm)

-50 to -90

Off to -60

Ec/No (dB)

-6dB

NOTE 1: MS is GPRS attached on Cell 1.

NOTE 2: Carrier 1 is the BCCH carrier, NC0.

NOTE 3: Carrier 2 is the UTRAN FDD cell configured according to TS 34.108, clause 6.1.4, Default settings for cell No.1

NOTE 4: Serving Cell Parameters are coded and transmitted on the specified Channel Type

NOTE 5: Carriers should have a relative accuracy of ±3 dB.

NOTE 6: SYSTEM INFORMATION TYPE 2QUATER Instance 1 and Instance 2 as per 20.25.1.

Test procedure

The MS is GPRS attached and has received a 3G Neighbour Cell description in System Information Type 2quater message, along with priority information.

Update the Carrier 1 and Carrier 2, power level as per the initial conditions.

It is verified that a Cell Reselection to UTRAN is performed within 30 sec.

Maximum duration of the test

5 minutes

Expected sequence

Step

Direction

Message

Comments

1

SS

SYSTEM INFORMATION TYPE 2QUATER

See specific contents below.

2

SS

Carrier 2 is activated with Ec/No = -6 (dB) and power level -60(dBm)

Set GSM power level to -90dBm to satisfy S_GSM criteria for low priority reselection evaluation

3

MS -> SS

RRC CONNECTION REQUEST

Verify that the MS reselects to Carrier 2 within 30 secs from Step 2.

Establishment cause shall be “interRAT-CellReselection”

Specific message contents

SYSTEM INFORMATION TYPE 2QUATER in Step 1

Information Element

Value/remark

< MP_CHANGE_MARK : bit (1)>

1

< UTRAN_PRIORITY : bit(3)>

’010’B

20.25.7 Intersystem Cell Reselection / Idle Mode / H_PRIO

20.25.7.1 Conformance requirement

If the 3G Cell Reselection list or the E-UTRAN Neighbour Cell list include frequencies of other radio access technologies, the MS shall, at least every 5 s update the value RLA_C for the serving cell and each of the at least 6 strongest non serving GSM cells.

The MS shall then reselect a suitable (see 3GPP TS 25.304 for UTRAN and 3GPP TS 36.304 for E-UTRAN) cell of another radio access technology if the criteria below are satisfied. S_non-serving_XXX is the measurement quantity of a non-serving inter-RAT cell and XXX indicates the other radio access technology/mode and is defined as follows:

– for a UTRAN cell, is the measured RSCP value for the cell minus UTRAN_QRXLEVMIN for the cell’s frequency;

For a GSM cell, S_GSM is defined as the C1 value for the cell (see subclause 6.4);

Cell reselection to a cell of another inter-RAT frequency shall be performed if any of the conditions below (to be evaluated in the order shown) is satisfied:

– The S_non-serving_XXX of one or more cells of a higher priority inter-RAT frequency is greater than THRESH_XXX_high during a time interval T_reselection; in that case, the mobile station shall consider the cells for reselection in decreasing order of priority and, for cells of the same priority, in decreasing order of S_non-serving_XXX, and reselect the first cell that satisfies the conditions above;

– The value of S_GSM is lower than THRESH_GSM_low for the serving cell and all measured GSM cells during a time interval T_reselection; in this case, the mobile station shall consider for reselection the inter-RAT cells in the following order, and reselect the first one that satisfies the following criteria:

– cells of a lower priority inter-RAT frequency whose S_non-serving_XXX is greater than THRESH_XXX_low during a time interval T_reselection; these cells shall be considered in decreasing order of priority and, for cells of the same priority, in decreasing order of S_non-serving_XXX;

– if no cells satisfy the criterion above, inter-RAT cells for which, during a time interval T_reselection, S_non-serving_XXX is higher than S_GSM for the serving cell by at least a specific hysteresis H_PRIO; these cells shall be considered in decreasing order of S_non-serving_XXX.

A UTRAN FDD cell shall only be reselected if, in addition to the criteria above, its measured Ec/No value is equal to or greater than FDD_Qmin – FDD_Qmin_Offset.

References:

3GPP TS 45.008, subclause 6.6.6

20.25.7.2 Test purpose

To verify that the MS uses the priority information and performs cell re-selection from GSM to UTRAN, according to hysteresis criteria while in Idle Mode.

20.25.7.3 Method of test

Initial conditions

Parameter

Cell 1

Cell 2

Carrier1

Carrier2

Channel Type carried

BCCH

BCH

Signal Level (dBm)

-50 to -90

Off to -75

Ec/No (dB)

-6dB

NOTE 1: MS is GPRS attached on Cell 1.

NOTE 2: Carrier 1 is the BCCH carrier, NC0.

NOTE 3: Carrier 2 is the UTRAN FDD cell configured according to TS 34.108, clause 6.1.4, Default settings for cell No.1

NOTE 4: Serving Cell Parameters are coded and transmitted on the specified Channel Type

NOTE 5: Carriers should have a relative accuracy of ±3 dB.

NOTE 6: SYSTEM INFORMATION TYPE 2QUATER (REL-8) as per 20.25.1.

Test procedure

The MS is GPRS attached and has received a 3G Neighbour Cell description in System Information Type 2quater message, along with priority information.

Update the Carrier 1 and Carrier 2, power level as per the initial conditions.

It is verified that a Cell Reselection to UTRAN is performed within 30 sec.

Maximum duration of the test

5 minutes

Expected sequence

Step

Direction

Message

Comments

1

SS

SYSTEM INFORMATION TYPE 2QUATER

See specific contents below.

2

SS

Carrier 2 is activated with Ec/No = -6 (dB) and power level -75(dBm)

Set GSM power level to -90dBm to satisfy S_GSM criteria for low priority reselection evaluation

3

MS -> SS

RRC CONNECTION REQUEST

Verify that the MS reselects to Carrier 2 within 30 secs from Step 2.

Establishment cause shall be “interRAT-CellReselection”

Specific message contents

SYSTEM INFORMATION TYPE 2QUATER in Step 1

Information Element

Value/remark

< MP_CHANGE_MARK : bit (1)>

1

< H_PRIO : bit(2) >

’01’B (5dB)

< UTRAN_PRIORITY : bit(3)>

’010’B

< THRESH_UTRAN_high : bit(5)>

’11111’B ( 62dB )