6.1.1 NG-RAN Only PLMN Selection

38.523-13GPP5GSPart 1: ProtocolRelease 17TSUser Equipment (UE) conformance specification

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

6.1.1.1 PLMN selection of RPLMN, HPLMN/EHPLMN, UPLMN and OPLMN / Automatic mode

6.1.1.1.1 Test Purpose (TP)

(1)

with { UE in Automatic network selection mode and RPLMN, HPLMN, UPLMN and OPLMN NR cells available and UE is fitted with a USIM indicating RPLMN should be selected }

ensure that {

when { UE is switched on or return to coverage }

then { UE selects a cell of the RPLMN and UE attempts Registration on the selected cell }

}

(2)

with { UE camped on an NG-RAN VPLMN cell and cells of a higher priority NG-RAN PLMN available }

ensure that {

when { higher priority PLMN search timer T expires }

then { UE selects and camps on a cell of the highest priority PLMN and UE attempts Registration with mobility on the selected cell }

}

(3)

with { UE in Automatic network selection mode and HPLMN, UPLMN and OPLMN NG-RAN cells available and UE is fitted with a USIM with Access Technology data files for each PLMN and there are no equivalent HPLMNs defined}

ensure that {

when { UE is switched on or return to coverage }

then { UE selects a cell of the highest priority PLMN and UE attempts Registration with mobility on the selected cell }

}

(4)

with { UE camped on an NR VPLMN cell and cells of a NG-RAN HPLMN available }

ensure that {

when { higher priority PLMN search timer T expires }

then { UE selects and camps on a cell of HPLMN and UE attempts Registration on the selected cell }

}

6.1.1.1.2 Conformance requirements

References: The conformance requirements covered in the present TC are specified in: TS 23.122 clauses 4.4.3.1, 4.4.3.1.1 and 4.4.3.3.1. Unless otherwise stated these are Rel-15 requirements.

[TS 23.122, clause 4.4.3.1]

At switch on, or following recovery from lack of coverage, the MS selects the registered PLMN or equivalent PLMN (if it is available) using all access technologies that the MS is capable of and if necessary (in the case of recovery from lack of coverage, see subclause 4.5.2) attempts to perform a Location Registration.

NOTE 1: The MS in automatic network selection mode can end the PLMN search procedure once the registered PLMN or equivalent PLMN is found on an access technology.

NOTE 2: An MS in automatic network selection mode can use location information to determine which PLMNs can be available in its present location.

EXCEPTION: As an alternative option to this, if the MS is in automatic network selection mode and it finds coverage of an EHPLMN, the MS may register to that EHPLMN and not return to the registered PLMN or equivalent PLMN. If the EHPLMN list is not present or is empty, and the HPLMN is available, the MS may register on the HPLMN and not return to the registered PLMN or equivalent PLMN. The operator shall be able to control by SIM configuration whether an MS that supports this option is permitted to perform this alternative behaviour.

EXCEPTION: In A/Gb mode an MS with voice capability, shall not search for CPBCCH carriers. In A/Gb mode an MS not supporting packet services shall not search for CPBCCH carriers.

If successful registration is achieved, the MS indicates the selected PLMN.

If there is no registered PLMN, or if registration is not possible due to the PLMN being unavailable or registration failure, the MS follows one of the following two procedures depending on its PLMN selection operating mode. At switch on, if the MS provides the optional feature of user preferred PLMN selection operating mode at switch on then this operating mode shall be used. Otherwise, the MS shall use the PLMN selection mode that was used before switching off.

EXCEPTION: At switch on, if the MS is in manual mode and neither registered PLMN nor PLMN that is equivalent to it is available but EHPLMN is available, then instead of performing the manual network selection mode procedure of subclause 4.4.3.1.2 the MS may select and attempt registration on the highest priority EHPLMN. If the EHPLMN list is not available or is empty and the HPLMN is available, then the MS may select and attempt registration on the HPLMN. The MS shall remain in manual mode.

NOTE 3: If successful registration is achieved, then the current serving PLMN becomes the registered PLMN and the MS does not store the previous registered PLMN for later use.

EXCEPTION: If registration is not possible on recovery from lack of coverage due to the registered PLMN being unavailable, an MS attached to GPRS services, attached via E-UTRAN or registered via the NG-RAN may, optionally, continue looking for the registered PLMN for an implementation dependent time.

NOTE 4: An MS attached to GPRS services, attached via E-UTRAN or registered via the NG-RAN should use the above exception only if one or more PDP contexts, PDN connections or PDU sessions are currently active.

[TS 23.122, clause 4.4.3.1.1]

The MS selects and attempts registration on other PLMN/access technology combinations, if available and allowable, in the following order:

i) either the HPLMN (if the EHPLMN list is not present or is empty) or the highest priority EHPLMN that is available (if the EHPLMN list is present) ;

ii) each PLMN/access technology combination in the "User Controlled PLMN Selector with Access Technology" data file in the SIM (in priority order);

iii) each PLMN/access technology combination in the "Operator Controlled PLMN Selector with Access Technology" data file in the SIM (in priority order);

iv) other PLMN/access technology combinations with received high quality signal in random order;

v) other PLMN/access technology combinations in order of decreasing signal quality.

When following the above procedure the following requirements apply:

a) An MS with voice capability shall ignore PLMNs for which the MS has identified at least one GSM COMPACT.

b) In A/Gb mode or GSM COMPACT, an MS with voice capability, or an MS not supporting packet services shall not search for CPBCCH carriers.

c) In ii and iii, the MS should limit its search for the PLMN to the access technology or access technologies associated with the PLMN in the appropriate PLMN Selector with Access Technology list (User Controlled or Operator Controlled selector list).

An MS using a SIM without access technology information storage (i.e. the "User Controlled PLMN Selector with Access Technology" and the "Operator Controlled PLMN Selector with Access Technology" data files are not present) shall instead use the "PLMN Selector" data file, for each PLMN in the "PLMN Selector" data file, the MS shall search for all access technologies it is capable of. The priority ordering amongst the access technologies is implementation dependent.

d) In iv and v, the MS shall search for all access technologies it is capable of, before deciding which PLMN to select.

e) In ii, and iii, a packet only MS which supports GSM COMPACT, but using a SIM without access technology information storage (i.e. the "User Controlled PLMN Selector with Access Technology" and the "Operator Controlled PLMN Selector with Access Technology" data files are not present) shall instead use the "PLMN Selector" data file, for each PLMN in the "PLMN Selector" data file, the MS shall search for all access technologies it is capable of and shall assume GSM COMPACT access technology as the lowest priority radio access technology.

f) In i, the MS shall search for all access technologies it is capable of. No priority is defined for the preferred access technology and the priority is an implementation issue, but "HPLMN Selector with Access Technology" data file on the SIM may be used to optimise the procedure.

g) In i, an MS using a SIM without access technology information storage (i.e. the "HPLMN Selector with Access Technology" data file is not present) shall search for all access technologies it is capable of. The priority ordering amongst the access technologies is implementation dependent. A packet only MS which supports GSM COMPACT using a SIM without access technology information storage shall also assume GSM COMPACT access technology as the lowest priority radio access technology.

NOTE 1: For f) and g), the MS in automatic network selection mode can end the PLMN search procedure once the HPLMN or the highest priority EHPLMN is found on an access technology.

NOTE 2: For i, ii and iii, the MS can use location information to determine which PLMNs can be available in its present location.

h) In v, the MS shall order the PLMN/access technology combinations in order of decreasing signal quality within each access technology. The order between PLMN/access technology combinations with different access technologies is an MS implementation issue.

NOTE 3: Requirements a) and b) apply also to requirement d), so a GSM voice capable MS should not search for GSM COMPACT PLMNs, even if capable of GSM COMPACT.

NOTE 4: Requirements a) and b) apply also to requirement f), so a GSM voice capable MS should not search for GSM COMPACT PLMNs, even if this is the only access technology on the "HPLMN Selector with Access Technology" data file on the SIM.

NOTE 5: High quality signal is defined in the appropriate AS specification.

i) In i to v, the MS shall not consider PLMNs where voice service was not possible as PLMN selection candidate, unless such PLMN is available in GERAN or UTRAN or no other allowed PLMN is available.

j) In i to v, if the MS only supports EMM-REGISTERED without PDN connection (see TS 24.301 [23A]), the MS shall not consider PLMNs which do not advertise support of EMM-REGISTERED without PDN connection.

k) In i to v, if the MS only supports control plane CIoT EPS optimization (see TS 24.301 [23A]) and the UE camps on a E-UTRA cell which is not NB-IoT cell (see TS 36.304 [43], TS 36.331 [22]), the MS shall not consider PLMNs which do not advertise support of EPS services with control plane CIoT EPS optimization.

l) In i to v, if the MS is in eCall only mode, the MS shall not consider PLMNs which do not advertise support for eCall over IMS, unless such PLMNs are available in GERAN or UTRAN.

NOTE 6: As an implementation option, an MS in eCall only mode that was not able to select any PLMN according to l) can perform a second iteration of i to v with no restriction.

If successful registration is achieved, the MS indicates the selected PLMN.

If registration cannot be achieved because no PLMNs are available and allowable, the MS indicates "no service" to the user, waits until a new PLMN is available and allowable and then repeats the procedure.

If there were one or more PLMNs which were available and allowable, but an LR failure made registration on those PLMNs unsuccessful or an entry in any of the lists "forbidden location areas for roaming", "forbidden tracking areas for roaming", "5GS forbidden tracking areas for roaming", "forbidden location areas for regional provision of service", "forbidden tracking areas for regional provision of service" or "5GS forbidden tracking areas for regional provision of service" prevented a registration attempt, the MS selects the first such PLMN again and enters a limited service state.

[TS 23.122, clause 4.4.3.3.1]

If the MS is in a VPLMN, the MS shall periodically attempt to obtain service on its HPLMN (if the EHPLMN list is not present or is empty) or one of its EHPLMNs (if the EHPLMN list is present) or a higher priority PLMN/access technology combinations listed in "user controlled PLMN selector" or "operator controlled PLMN selector" by scanning in accordance with the requirements that are applicable to i), ii) and iii) as defined in the Automatic Network Selection Mode in subclause 4.4.3.1.1. In the case that the mobile has a stored "Equivalent PLMNs" list the mobile shall only select a PLMN if it is of a higher priority than those of the same country as the current serving PLMN which are stored in the "Equivalent PLMNs" list. For this purpose, a value of timer T may be stored in the SIM. The interpretation of the stored value depends on the radio capabilities supported by the MS:

– For an MS that does not support any of the following: EC-GSM-IoT, Category M1 or Category NB1 (as defined in TS 36.306 [54]), T is either in the range 6 minutes to 8 hours in 6 minute steps or it indicates that no periodic attempts shall be made. If no value for T is stored in the SIM, a default value of 60 minutes is used for T.

– For an MS that only supports any of the following or a combination of: EC-GSM-IoT, Category M1 or Category NB1 (as defined in TS 36.306 [54]), T is either in the range 2 hours to 240 hours, using 2 hour steps from 2 hours to 80 hours and 4 hour steps from 84 hours to 240 hours, or it indicates that no periodic attempts shall be made. If no value for T is stored in the SIM, a default value of 72 hours is used.

– For an MS that supports both:

a) any of the following or a combination of: EC-GSM-IoT, Category M1 or Category NB1 (as defined in 3GPP TS 36.306 [54]); and

b) any access technology other than the following: EC-GSM-IoT, Category M1 or Category NB1 (as defined in 3GPP TS 36.306 [54]),

then T is interpreted depending on the access technology in use as specified below:

1) if the MS is using any of the following at the time of starting timer T: EC-GSM-IoT, Category M1 or Category NB1 (as defined in 3GPP TS 36.306 [54]), T is either in the range 2 hours to 240 hours, using 2 hour steps from 2 hours to 80 hours and 4 hour steps from 84 hours to 240 hours, or it indicates that no periodic attempts shall be made. If no value for T is stored in the SIM, a default value of 72 hours is used; and

2) if the MS is not using any of the following at the time of starting timer T: EC-GSM-IoT, Category M1 or Category NB1 (as defined in 3GPP TS 36.306 [54]), T is either in the range 6 minutes to 8 hours in 6 minute steps or it indicates that no periodic attempts shall be made. If no value for T is stored in the SIM, a default value of 60 minutes is used for T.

If the MS is configured with the MinimumPeriodicSearchTimer as specified in 3GPP TS 24.368 [50] or 3GPP TS 31.102 [40], the MS shall not use a value for T that is less than the MinimumPeriodicSearchTimer. If the value stored in the SIM, or the default value for T (when no value is stored in the SIM), is less than the MinimumPeriodicSearchTimer, then T shall be set to the MinimumPeriodicSearchTimer.

The MS does not stop timer T, as described in 3GPP TS 24.008 [23] and 3GPP TS 24.301 [23A], when it activates power saving mode (PSM) (see 3GPP TS 23.682 [27A]).

The MS can be configured for Fast First Higher Priority PLMN search as specified in 3GPP TS 31.102 [40] or 3GPP TS 24.368 [50]. Fast First Higher Priority PLMN search is enabled if the corresponding configuration parameter is present and set to enabled. Otherwise, Fast First Higher Priority PLMN search is disabled.

The attempts to access the HPLMN or an EHPLMN or higher priority PLMN shall be as specified below:

a) The periodic attempts shall only be performed in automatic mode when the MS is roaming, and not while the MS is attached for emergency bearer services, is registered for emergency services, has a PDU session for emergency services or has a PDN connection for emergency bearer services;

b) The MS shall make the first attempt after a period of at least 2 minutes and at most T minutes:

– only after switch on if Fast First Higher Priority PLMN search is disabled; or

– after switch on or upon selecting a VPLMN if Fast First Higher Priority PLMN search is enabled.

c) The MS shall make the following attempts if the MS is on the VPLMN at time T after the last attempt;

d) Periodic attempts shall only be performed by the MS while in idle mode;

d1) Periodic attempts may be postponed while the MS is in power saving mode (PSM) (see 3GPP TS 23.682 [27A]).

d2) Periodic attempts may be postponed while the MS is receiving eMBMS transport service in idle mode (see 3GPP TS 23.246 [68]).

e) If the HPLMN (if the EHPLMN list is not present or is empty) or a EHPLMN (if the list is present) or a higher priority PLMN is not found, the MS shall remain on the VPLMN.

f) In steps i), ii) and iii) of subclause 4.4.3.1.1 the MS shall limit its attempts to access higher priority PLMN/access technology combinations to PLMN/access technology combinations of the same country as the current serving VPLMN, as defined in Annex B.

g) Only the priority levels of Equivalent PLMNs of the same country as the current serving VPLMN, as defined in Annex B, shall be taken into account to compare with the priority level of a selected PLMN.

h) If the PLMN of the highest priority PLMN/access technology combination available is the current VPLMN, or one of the PLMNs in the "Equivalent PLMNs" list, the MS shall remain on the current PLMN/access technology combination.

6.1.1.1.3 Test description

6.1.1.1.3.1 Pre-test conditions

System Simulator:

– Four multi-PLMN NR Cells as specified in TS 38.508-1 [4] Table 4.4.2.1 are configured broadcasting PLMNs as indicated in Table 6.1.1.1.3.1-1.

– The PLMNs are identified in the test by the identifiers in Table 6.1.1.1.3.1-1 and the PLMN settings are defined in TS 36.523-1 [13] table 6.0.1-1.

Table 6.1.1.1.3.1-1: PLMN identifiers

NR Cell	PLMN name
1	PLMN1
12	PLMN15
13	PLMN16
2	PLMN17

All NR cells are high quality

All NR cells are suitable cells;

System information combination NR-1 as defined in TS 38.508-1 [4] clause 4.4.3.1.2 is used in NR cells

UE:

The UE is in Automatic PLMN selection mode.

USIM configuration as defined in TS 38.508-1 [4] Table 6.4.1-1 will be loaded except for PLMN identifiers in Table 6.1.1.1.3.1-1.

Preamble:

– The UE is registered to NR Cell 12 and then Switched OFF (State 0N-B) as defined in TS 38.508-1 [4] Table 4.4A.2-0.

6.1.1.1.3.2 Test procedure sequence

Table 6.1.1.1.3.2-1 for FR1 and Table 6.1.1.1.3.2-2 for FR2 illustrates the downlink power levels and other changing parameters to be applied for the cells at various time instants of the test execution. Row marked "T0" denotes the initial conditions after preamble, while columns marked "T1", "T2" and "T3" are to be applied subsequently in the Main behaviour. The exact instants on which these values shall be applied are described in the texts in this clause.

Table 6.1.1.1.3.2-1: Cell configuration changes over time for FR1

	Parameter	Unit	NR Cell 1	NR Cell 12	NR Cell 13	NR Cell 2	Remarks
T0	SS/PBCH SSS EPRE	dBm/SCS	"Off"	-88	"Off"	"Off"	Power level “Off” is defined in TS 38.508-1 Table 6.2.2.1-3
T1	SS/PBCH SSS EPRE	dBm/SCS	-88	-88	-88	"Off"	Power level “Off” is defined in TS 38.508-1 Table 6.2.2.1-3
T2	SS/PBCH SSS EPRE	dBm/SCS	"Off"	-88	-88	"Off"	Power level “Off” is defined in TS 38.508-1 Table 6.2.2.1-3
T3	SS/PBCH SSS EPRE	dBm/SCS	"Off"	-88	-88	-88	Power level “Off” is defined in TS 38.508-1 Table 6.2.2.1-3

Table 6.1.1.1.3.2-2: Cell configuration changes over time for FR2

	Parameter	Unit	NR Cell 1	NR Cell 12	NR Cell 13	NR Cell 2	Remarks
T0	SS/PBCH SSS EPRE	dBm/SCS	“Off”	[-85]	“Off”	“Off”	Power level “Off” is defined in TS 38.508-1 Table 6.2.2.1-3
T1	SS/PBCH SSS EPRE	dBm/SCS	[-85]	[-85]	[-85]	”Off”	Power level “Off” is defined in TS 38.508-1 Table 6.2.2.1-3
T2	SS/PBCH SSS EPRE	dBm/SCS	“Off”	[-85]	[-85]	“Off”	Power level “Off” is defined in TS 38.508-1 Table 6.2.2.1-3
T3	SS/PBCH SSS EPRE	dBm/SCS	“Off”	[-85]	[-85]	[-85]	Power level “Off” is defined in TS 38.508-1 Table 6.2.2.1-3

Table 6.1.1.1.3.2-2: Main behaviour

St	Procedure	Message Sequence		TP	Verdict
		U – S	Message
1	SS adjusts cell levels according to row T1 of table 6.1.1.1.3.2-1 for FR1 and table 6.1.1.1.3.2-2 for FR2	–	–	–	–
2	Power on the UE.	–	–	–	–
3	Check: Does the UE send a RRCSetupRequest on NR Cell 12?	–>	RRCSetupRequest	1	P
4-21	Steps 3 to 20a1 of the registration procedure described in TS 38.508-1 subclause 4.5.2.2-2 are performed on NR Cell 12. NOTE: The UE performs registration and the RRC connection is released.	–	–	–	–
22	Check: Does the UE send a RRCSetupRequest on NR Cell 1 after 120 seconds, but before 660seconds (Note 1 and 2) from power on?	–>	RRCSetupRequest	4	P
22A-22B	Steps 3-4 of Table 4.5.2.2-2 of the generic procedure in TS 38.508-1 [4] are performed. (Note 3)	–	–	–	–
–	EXCEPTION: Steps 23a1 to 23b5a1 describe behaviour that depends on events happening prior to their execution; the "lower case letter" identifies a step sequence that take place if a specific prior event takes place.	–	–	–	–
23a1-23a16a1	IF 5GS registration type is set as Initial Registration in step 22B, THEN Steps 5 to 20a1of the generic test procedure in TS 38.508-1 Table 4.5.2.2-2 are performed on NR Cell 1.	–	–	–	–
23b1-23b2	Void	–	–	–	–
23b3-23b5a1	IF 5GS registration type is set as Mobility Registration in step 22B, THEN Steps 4 to 6a1 of the generic test procedure in TS 38.508-1 Table 4.9.5.2.2-1 are performed on NR Cell 1.	–	–	–	–
24-27	Void	–	–	–	–
28	SS adjusts cell levels according to row T2 of table 6.1.1.1.3.2-1 for FR1 and table 6.1.1.1.3.2-2 for FR2	–	–	–	–
29	Check: Does the UE send a RRCSetupRequest on NR Cell 13?	–>	RRCSetupRequest	3	P
29A-29B	Steps 3-4 of Table 4.5.2.2-2 of the generic procedure in TS 38.508-1 [4] are performed. (Note 3)	–	–	–	–
–	EXCEPTION: Steps 29a1 to 29b5a1 describe behaviour that depends on events happening prior to their execution; the "lower case letter" identifies a step sequence that take place if a specific prior event takes place.	–	–	–	–
29a1-29a16a1	IF 5GS registration type is set as Initial Registration in step 29B, THEN Steps 5 to 20a1of the generic test procedure in TS 38.508-1 Table 4.5.2.2-2 are performed on NR Cell 13.	–	–	–	–
29b1-29b2	Void.	–	–	–	–
29b3-29b5a1	IF 5GS registration type is set as Mobility Registration in step 29B, THEN Steps 4 to 6a1 of the generic test procedure in TS 38.508-1 Table 4.9.5.2.2-1 are performed on NR Cell 13.	–	–	–	–
30	SS adjusts cell levels according to row T3 of table 6.1.1.1.3.2-1 for FR1 and table 6.1.1.1.3.2-2 for FR2	–	–	–	–
31	Check: Does the UE send a RRCSetupRequest on NR Cell 2 after 120 seconds, but before 660 seconds after step 30? (Note 1 and 2)	–>	RRCSetupRequest	2	P
31A-31B	Steps 3-4 of Table 4.5.2.2-2 of the generic procedure in TS 38.508-1 [4] are performed. (Note 3)	–	–	–	–
–	EXCEPTION: Steps 32a1 to 32b5a1 describe behaviour that depends on events happening prior to their execution; the "lower case letter" identifies a step sequence that take place if a specific prior event takes place.	–	–	–	–
32a1-32a16a1	IF 5GS registration type is set as Initial Registration in step 31B, THEN Steps 5 to 20a1of the generic test procedure in TS 38.508-1 Table 4.5.2.2-2 are performed on NR Cell 2.	–	–	–	–
32b1-32b2	Void	–	–	–	–
32b3-32b5a1	IF 5GS registration type is set as Mobility Registration in step 31B, THEN Steps 4 to 6a1 of the generic test procedure in TS 38.508-1 Table 4.9.5.2.2-1 are performed on NR Cell 2.	–	–	–	–
33-36	Void	–	–	–	–
Note 1: Following attempts to access the HPLMN/EHPLMN/higher priority PLMN in VPLMN is operator specific setting (Refer to TS 23.122 Rel-15).Hence, window between 120s to T+Tolerance is being used, where the high priority PLMN search timer T defined by EF_HPPLMN. Note 2: Tolerance of 5min is added to allow time for the UE to find the proper PLMN. Note 3: The 5GS registration type shall be only set as Mobility Registration for R16 UEs according to TS 24.501 subclause 5.2.3.2.5 specified in Release 16. The EXCEPTION description applies only to R15 UEs.

6.1.1.1.3.3 Specific message contents

None

6.1.1.2 PLMN selection of "Other PLMN/access technology combinations" / Automatic mode

6.1.1.2.1 Test Purpose (TP)

(1)

with { UE in Automatic network selection mode and EHPLMN, UPLMN and OPLMN/access technology combinations cells available and UE is fitted with a USIM with Access Technology data files for each PLMN }

ensure that {

when { UE is switched on or return to coverage }

then { UE selects a cell of the EHPLMN and UE attempts a Registration on the selected cell }

}

(2)

with { UE in Automatic network selection mode and UPLMN, OPLMN and other PLMN/access technology combinations cells available and UE is fitted with a USIM with Access Technology data files for each PLMN }

ensure that {

when { UE is switched on or return to coverage }

then { UE selects a cell of the UPLMN and UE attempts a Registration on the selected cell }

}

(3)

with { UE in Automatic network selection mode and OPLMN and other PLMN/access technology combinations cells available and UE is fitted with a USIM with Access Technology data files for each PLMN }

ensure that {

when { UE is switched on or return to coverage }

then { UE selects a cell of the OPLMN and UE attempts a Registration on the selected cell }

}

(4)

with { UE in Automatic network selection mode and other PLMN/access technology combinations cells not belonging to any of EHPLMN, UPLMN or OPLMN available }

ensure that {

when { UE is switched on or return to coverage }

then { UE selects a cell of other PLMN/access technology combinations and UE attempts a Registration on the selected cell }

}

6.1.1.2.2 Conformance requirements

References: The conformance requirements covered in the current TC are specified in: TS 23.122 clauses 4.4.3.1.1. Unless otherwise stated these are Rel-15 requirements.