9.2.5 RACS

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

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

9.2.5.1 RACS / Network assigned UE radio capability ID

9.2.5.1.1 Test Purpose (TP)

(1)

with { UE is powered on or switched on and has an applicable UE radio capability ID for the current UE radio configuration for the selected PLMN }

ensure that {

when { UE initiates an Attach procedure }

then { UE indicates the UE radio capability ID availability in ATTACH REQUEST message }

}

(2)

with { UE indicating UE radio capability ID availability in ATTACH REQUEST message }

ensure that {

when { the UE receives a SECURITY MODE COMMAND message requesting UE radio capability ID }

then { UE includes UE radio capability ID in SECURITY MODE COMPLETE message }

}

(3)

with { UE in state EMM-REGISTERED and EMM-IDLE mode and having assigned a new UE Radio Capability ID in the ATTACH ACCEPT message }

ensure that {

when { the UE detects entering a tracking area that is not in the list of tracking areas that the UE previously registered in the MME }

then { UE sends TRACKING AREA UPDATE REQUEST message including the indication of UE radio capability ID availability }

}

(4)

with { UE indicating UE radio capability ID availability in TRACKING AREA UPDATE REQUEST message }

ensure that {

when { the UE receives a SECURITY MODE COMMAND message requesting UE radio capability ID }

then { UE includes UE radio capability ID in SECURITY MODE COMPLETE message }

}

(5)

with { UE having assigned a UE radio capability ID }

ensure that {

when { the UE enters a cell belonging to another PLMN }

then { UE does not include UE radio capability ID availability indication in TRACKING AREA UPDATE REQUEST message }

}

9.2.5.1.2 Conformance requirements

References: The conformance requirements covered in the present TC are specified in: TS 24.301, clause 5.3.20.

[TS 24.301, clause 5.3.20]

UE radio capability signalling optimisation (RACS) is a feature that is optional at both the UE and the network and which aims to optimise the transmission of UE radio capability over the radio interface (see 3GPP TS 23.401 [10]). RACS works by assigning an identifier to represent a set of UE radio capabilities. This identifier is called the UE radio capability ID. A UE radio capability ID can be either manufacturer-assigned or network-assigned. The UE radio capability ID is an alternative to the signalling of the radio capabilities container over the radio interface.

In this release of the specification, RACS is not applicable to NB-S1 mode.

If the UE supports RACS:

– the UE shall indicate support for RACS by setting the RACS bit to "RACS supported" in the UE network capability IE of the ATTACH REQUEST and TRACKING AREA UPDATE REQUEST messages;

– if the UE performs an attach procedure and the UE has an applicable UE radio capability ID for the current UE radio configuration in the selected network, the UE shall include the UE radio capability ID availability IE in the ATTACH REQUEST message and set the IE to "UE radio capability ID available";

– if the UE performs a tracking area updating procedure and the UE has an applicable UE radio capability ID for the current UE radio configuration in the selected network, the UE shall include the UE radio capability ID availability IE in the TRACKING AREA UPDATE REQUEST message and set the IE to "UE radio capability ID available";

– If the UE is requested to provide the UE radio capability ID by the network during a security mode control procedure, the UE shall include the UE radio capability ID in the UE radio capability ID IE of the SECURITY MODE COMPLETE message according to the rules in clause 5.4.3.3.;

…

– upon receiving a network-assigned UE radio capability ID in the ATTACH ACCEPT message in the TRACKING AREA UPDATE ACCEPT message or in the GUTI REALLOCATION COMMAND message, the UE shall store the network-assigned UE radio capability ID and the PLMN ID of the serving network along with a mapping to the current UE radio configuration in its non-volatile memory as specified in annex C.

…

If the network supports RACS:

– if the UE has included the UE radio capability ID availability IE in the ATTACH REQUEST message and set the IE to "UE radio capability ID available", the network shall initiate a security mode control procedure to retrieve the UE radio capability ID from the UE;

– if the UE has included the UE radio capability ID availability IE in the TRACKING AREA UPDATE REQUEST message and set the IE to "UE radio capability ID available", the network may initiate a security mode control procedure to retrieve the UE radio capability ID from the UE;

– if the UE has included the UE radio capability ID availability IE in the TRACKING AREA UPDATE REQUEST message, set the URCIDA bit to "UE radio capability ID available" in the UE radio capability ID availability IE and no UE radio capability ID is available in the UE context in the MME, the network shall initiate a security mode control procedure to retrieve the UE radio capability ID from the UE;

– the network may assign a network-assigned UE radio capability ID to a UE which supports RACS by including a UE radio capability ID IE in the ATTACH ACCEPT message, in the TRACKING AREA UPDATE ACCEPT message or in the GUTI REALLOCATION COMMAND message; and

9.2.5.1.3 Test description

9.2.5.1.3.1 Pre-test conditions

System Simulator:

– cell A (belongs to TAI-1, home PLMN) is set to ”Serving cell”;

– cell B (belongs to TAI-2, home PLMN) is set to ”Non- Suitable cell”;

– cell G (belongs to TAI-7, visited PLMN) is set to ”Non- Suitable cell”.

UE:

– the UE is previously registered on E-UTRAN, and when on E-UTRAN, the UE is last authenticated and registered on cell A using default message contents according to TS 36.508 [18];

Preamble:

– the UE is in state Switched OFF (state 1) according to TS 36.508 [18].

9.2.5.1.3.2 Test procedure sequence

Table 9.2.5.1.3.2-1: Main behaviour

St	Procedure	Message Sequence		TP	Verdict
		U – S	Message
1	The UE is switched on.	–	–	–	–
2	Check: Does the UE include UE radio capability availability indication in ATTACH REQUEST message on Cell A?	–>	ATTACH REQUEST	1	P
3-4	Steps 5-6 of the generic procedure for UE registration specified in TS 36.508 subclause 4.5.2.3 are performed.	–	–	–	–
5	The SS transmits a NAS SECURITY MODE COMMAND message requesting UE radio capability ID.	<–	SECURITY MODE COMMAND	–	–
6	Check: Does the UE transmit a NAS SECURITY MODE COMPLETE message including UE radio capability ID 1?	–>	SECURITY MODE COMPLETE	2	P
7-11	Steps 9-13 of the generic procedure for UE registration specified in TS 36.508 subclause 4.5.2.3 are performed.	–	–	–	–
12	SS transmits a ATTACH ACCEPT message with a new UE radio capability ID 2.	<–	ATTACH ACCEPT	–	–
13-16	Steps 15-18 of the generic procedure for UE registration specified in TS 36.508 subclause 4.5.2.3 are performed.	–	–	–	–
–	The following messages are sent and shall be received on cell B.	–	–	–	–
17	The SS configures: – Cell A as the "Non-Suitable cell". – Cell B as a "Serving cell".	–	–	–	–
18	Check: Does the UE include UE radio capability availability indication in TRACKING AREA UPDATE REQUEST message?	–>	TRACKING AREA UPDATE REQUEST	3	P
19	The SS transmits a NAS SECURITY MODE COMMAND message requesting UE radio capability ID.	<–	SECURITY MODE COMMAND	–	–
20	Check: Does the UE transmit a NAS SECURITY MODE COMPLETE message including UE radio capability ID 2?	–>	SECURITY MODE COMPLETE	4	P
21	The SS transmits a TRACKING AREA UPDATE ACCEPT message.	<–	TRACKING AREA UPDATE ACCEPT	–	–
22	The UE transmits a TRACKING AREA UPDATE COMPLETE message.	–>	TRACKING AREA UPDATE COMPLETE	–	–
23	The SS releases the RRC connection.	–	–	–	–
–	The following messages are sent and shall be received on cell G.	–	–	–	–
24	The SS configures: – Cell B as the "Non-Suitable cell". – Cell G as a "Serving cell".	–	–	–	–
25	Check: Does the UE include UE radio capability availability indication in TRACKING AREA UPDATE REQUEST message?	–>	TRACKING AREA UPDATE REQUEST	5	F
26	The SS transmits a TRACKING AREA UPDATE ACCEPT message.	<–	TRACKING AREA UPDATE ACCEPT	–	–
27	The UE transmits a TRACKING AREA UPDATE COMPLETE message.	–>	TRACKING AREA UPDATE COMPLETE	–	–
28	The SS releases the RRC connection.	–	–	–	–

9.2.5.1.3.3 Specific message contents

Table 9.2.5.1.3.3-1: Message ATTACH REQUEST (preamble)

Derivation path: 36.508 table 4.7.2-4
Information Element	Value/Remark	Comment	Condition
UE network capability
Radio capability signalling optimisation (RACS) capability (octet 10, bit 1)	‘1’B	RACS supported

Table 9.2.5.1.3.3-2: Message ATTACH ACCEPT (preamble)

Derivation path: 36.508 table 4.7.2-1

Information Element

Value/Remark

Comment

Condition

UE radio capability ID

‘01000000000010’H

Type Field (TF): 1

Version ID: 00

Radio Configuration Identifier (RCI): 000000000001

Table 9.2.5.1.3.3-3: Message ATTACH REQUEST (step 2)

Derivation path: 36.508 table 4.7.2-4
Information Element	Value/Remark	Comment	Condition
UE radio capability ID availability	‘001’B	UE radio capability ID available

Table 9.2.5.1.3.3-4: Message SECURITY MODE COMPLETE (step 6)

Derivation path: 36.508 table 4.7.2-20

Information Element

Value/Remark

Comment

Condition

UE radio capability ID

‘01000000000010’H

Type Field (TF): 1

Version ID: 00

Radio Configuration Identifier (RCI): 000000000001

Table 9.2.5.1.3.3-5: Message ATTACH ACCEPT (step 12)

Derivation path: 36.508 table 4.7.2-1

Information Element

Value/Remark

Comment

Condition

UE radio capability ID

‘01000000000020’H

Type Field (TF): 1

Version ID: 00

Radio Configuration Identifier (RCI): 000000000002

Table 9.2.5.1.3.3-6: Message TRACKING AREA UPDATE REQUEST (step 18)

Derivation path: 36.508 table 4.7.2-27
Information Element	Value/Remark	Comment	Condition
EPS update type	‘000’B	TA updating
UE radio capability ID availability	‘001’B	UE radio capability ID available

Table 9.2.5.1.3.3-7: Message SECURITY MODE COMPLETE (step 20)

Derivation path: 36.508 table 4.7.2-20

Information Element

Value/Remark

Comment

Condition

UE radio capability ID

‘01000000000020’H

Type Field (TF): 1

Version ID: 00

Radio Configuration Identifier (RCI): 000000000002

Table 9.2.5.1.3.3-8: Message TRACKING AREA UPDATE REQUEST (step 25)

Derivation path: 36.508 table 4.7.2-27
Information Element	Value/Remark	Comment	Condition
EPS update type	‘000’B	TA updating
UE radio capability ID availability	‘001’B	UE radio capability ID not available

9.2.5.2 RACS / USIM change / Handling of URCID

9.2.5.2.1 Test Purpose (TP)

(1)

with { UE in state EMM-REGISTERED and EMM-IDLE mode and having assigned a UE Radio Capability ID in the ATTACH ACCEPT message }

ensure that {

when { UE is powered on or switched on with USIM having different IMSI }

then { UE does not include UE radio capability ID availability indication in ATTACH REQUEST message }

}

9.2.5.2.2 Conformance requirements

References: The conformance requirements covered in the present TC are specified in: TS 24.301, clause 5.3.20, Annex C.

[TS 24.301, clause 5.3.20]

In this release of the specification, RACS is not applicable to NB-S1 mode.

If the UE supports RACS:

– the UE shall indicate support for RACS by setting the RACS bit to "RACS supported" in the UE network capability IE of the ATTACH REQUEST and TRACKING AREA UPDATE REQUEST messages;

…

If the network supports RACS:

[TS 24.301, Annex C]

The following EMM parameters shall be stored in a non-volatile memory in the ME together with the IMSI from the USIM:

– TIN;

– DCN-ID list; and

– network-assigned UE radio capability IDs.

…

Each network-assigned UE radio capability ID is stored together with a PLMN identity of the PLMN that provided it as well as a mapping to the corresponding UE radio configuration, and is valid in that PLMN. A network-assigned UE radio capability ID can only be used if the IMSI from the USIM matches the IMSI stored in the non-volatile memory of the ME, else the UE shall delete the network-assigned UE radio capability ID.

9.2.5.2.3 Test description

9.2.5.2.3.1 Pre-test conditions

System Simulator:

– cell A (belongs to TAI-1, home PLMN) is set to ”Serving Cell”;

UE:

– The UE is equipped with a USIM containing default values (as per TS 36.508)

– USIM A containing default values (as per TS 36.508) except for those listed in Table 9.2.5.2.3.1-1 will be used.

Table 9.2.5.2.3.1-1: USIM A Configuration

USIM field

Value

EF_IMSI

The HPLMN (MCC+MNC) of the IMSI

is set to 001-11

Preamble:

– The UE is in state Registered, Idle Mode (state 2) on cell A according to TS 36.508 [18].

9.2.5.2.3.2 Test procedure sequence

Table 9.2.5.2.3.2-1: Main behaviour

St	Procedure	Message Sequence		TP	Verdict
		U – S	Message
1	If possible (see ICS) switch off is performed or the USIM is removed. Otherwise the power is removed.	–	–	–	–
2	The UE is brought back to operation with USIM A inserted.	–	–	–	–
3	Check: Does the UE transmit an ATTACH REQUEST message without including UE radio capability availability indication?	–>	ATTACH REQUEST	1	P
4-17	The attach procedure is completed by executing steps 5 to 18 of the UE registration procedure in TS 36.508 sub clause 4.5.2.3.	–	–	–	–

9.2.5.2.3.3 Specific message contents

Table 9.2.5.2.3.3-1: Message ATTACH REQUEST (preamble)

Derivation path: 36.508 table 4.7.2-4
Information Element	Value/Remark	Comment	Condition
UE network capability
Radio capability signalling optimisation (RACS) capability (octet 10, bit 1)	‘1’B	RACS supported

Table 9.2.5.2.3.3-2: Message ATTACH ACCEPT (preamble)

Derivation path: 36.508 table 4.7.2-1

Information Element

Value/Remark

Comment

Condition

UE radio capability ID

‘01000000000010’H

Type Field (TF): 1

Version ID: 00

Radio Configuration Identifier (RCI): 000000000001

Table 9.2.5.2.3.3-3: Message ATTACH REQUEST (step 3)

Derivation path: 36.508 table 4.7.2-4
Information Element	Value/Remark	Comment	Condition
UE radio capability ID availability	‘001’B	UE radio capability ID not available

9.2.5.3 RACS / Handling of delete indication for NW assigned UE radio capability ID

9.2.5.3.1 Test Purpose (TP)

(1)

with { UE having an applicable UE radio capability ID for the current UE radio configuration for the selected PLMN performs Attach procedure }

ensure that {

when { UE receives ATTACH ACCEPT message with network assigned UE radio capability ID deletion indication }

then { UE deletes any stored Network-assigned UE radio capability IDs and performs Tracking Area update procedure and does not include UE radio capability ID availability indication in TRACKING AREA UPDATE REQUEST message }

}

(2)

with { UE in state EMM-REGISTERED and EMM-IDLE mode and having assigned a new UE Radio Capability ID, enters a tracking area that is not in the list of tracking areas that the UE previously registered in the MME }

ensure that {

when { UE receives TRACKING AREA UPDATE ACCEPT message with network assigned UE radio capability ID deletion indication }

}

9.2.5.3.2 Conformance requirements

References: The conformance requirements covered in the present TC are specified in: TS 24.301, clause 5.3.20.

[TS 24.301, clause 5.3.20]

In this release of the specification, RACS is not applicable to NB-S1 mode.

If the UE supports RACS:

– the UE shall indicate support for RACS by setting the RACS bit to "RACS supported" in the UE network capability IE of the ATTACH REQUEST and TRACKING AREA UPDATE REQUEST messages;

…

– upon receiving a UE radio capability ID deletion indication IE set to "Network-assigned UE radio capability IDs deletion requested" in the ATTACH ACCEPT message in the TRACKING AREA UPDATE ACCEPT message or in the GUTI REALLOCATION COMMAND message, the UE shall delete all network-assigned UE radio capability IDs stored at the UE for the serving network and initiate a tracking area updating procedure. If the UE has an applicable manufacturer-assigned UE radio capability ID for the current UE radio configuration in the selected network, the UE shall include a UE radio capability ID availability IE set to "UE radio capability ID available" in the TRACKING AREA UPDATE REQUEST message.

If the network supports RACS:

– the network may trigger the UE to delete all network-assigned UE radio capability IDs stored at the UE for the serving network by including a UE radio capability ID deletion indication IE set to "Network-assigned UE radio capability IDs deletion requested" in the ATTACH ACCEPT message, in the TRACKING AREA UPDATE ACCEPT message or in the GUTI REALLOCATION COMMAND message.

9.2.5.3.3 Test description

9.2.5.3.3.1 Pre-test conditions

System Simulator:

– cell A (belongs to TAI-1, home PLMN) is set to ”Serving cell”;

– cell B (belongs to TAI-2, home PLMN) is set to ”Non- Suitable cell”;

UE:

– the UE is previously registered on E-UTRAN, and when on E-UTRAN, the UE is last authenticated and registered on cell A using default message contents according to TS 36.508 [18];

Preamble:

– the UE is in state Switched OFF (state 1) according to TS 36.508 [18].

9.2.5.3.3.2 Test procedure sequence

Table 9.2.5.3.3.2-1: Main behaviour

St	Procedure	Message Sequence		TP	Verdict
		U – S	Message
1	The UE is switched on.	–	–	–	–
2	The UE transmits an ATTACH REQUEST message.	–>	ATTACH REQUEST	–	–
3-11	Steps 5-13 of the generic procedure for UE registration specified in TS 36.508 subclause 4.5.2.3 are performed.	–	–	–	–
12	SS transmits an ATTACH ACCEPT message including UE radio capability ID deletion indication.	<–	ATTACH ACCEPT	–	–
13-14	Steps 15-16 of the generic procedure for UE registration specified in TS 36.508 subclause 4.5.2.3 are performed.	–	–	–	–
15	Check: Does the UE transmit TRACKING AREA UPDATE REQUEST message without UE radio capability availability indication?	–>	TRACKING AREA UPDATE REQUEST	1	P
16	The SS transmits a TRACKING AREA UPDATE ACCEPT message including a UE radio capability ID.	<–	TRACKING AREA UPDATE ACCEPT	–	–
17	The UE transmits a TRACKING AREA UPDATE COMPLETE message.	–>	TRACKING AREA UPDATE COMPLETE	–	–
18	The SS releases the RRC connection.	–	–	–	–
–	The following messages are sent and shall be received on cell B.	–	–	–	–
19	The SS configures: – Cell A as the "Non-Suitable cell". – Cell B as a "Serving cell".	–	–	–	–
20	The UE transmits a TRACKING AREA UPDATE REQUEST message including the UE radio capability ID availability indication.	–>	TRACKING AREA UPDATE REQUEST	–	–
21	The SS transmits a TRACKING AREA UPDATE ACCEPT message including UE radio capability ID deletion indication.	<–	TRACKING AREA UPDATE ACCEPT	–	–
22	The UE transmits a TRACKING AREA UPDATE COMPLETE message.	–>	TRACKING AREA UPDATE COMPLETE	–	–
23	Check: Does the UE transmit TRACKING AREA UPDATE REQUEST message without UE radio capability availability indication?	–>	TRACKING AREA UPDATE REQUEST	2	P
24	The SS transmits a TRACKING AREA UPDATE ACCEPT message.	<–	TRACKING AREA UPDATE ACCEPT	–	–
25	The UE transmits a TRACKING AREA UPDATE COMPLETE message.	–>	TRACKING AREA UPDATE COMPLETE	–	–
26	The SS releases the RRC connection.	–	–	–	–

9.2.5.3.3.3 Specific message contents

Table 9.2.5.3.3.3-1: Message ATTACH REQUEST (preamble)

Derivation path: 36.508 table 4.7.2-4
Information Element	Value/Remark	Comment	Condition
UE network capability
Radio capability signalling optimisation (RACS) capability (octet 10, bit 1)	‘1’B	RACS supported

Table 9.2.5.3.3.3-2: Message ATTACH ACCEPT (preamble)

Derivation path: 36.508 table 4.7.2-1

Information Element

Value/Remark

Comment

Condition

UE radio capability ID

‘01000000000010’H

Type Field (TF): 1

Version ID: 00

Radio Configuration Identifier (RCI): 000000000001

Table 9.2.5.3.3.3-3: Message ATTACH ACCEPT (step 12)

Derivation path: 36.508 table 4.7.2-1
Information Element	Value/Remark	Comment	Condition
UE radio capability ID deletion indication	‘001’B	Network-assigned UE radio capability IDs deletion requested

Table 9.2.5.3.3.3-4: Message TRACKING AREA UPDATE REQUEST (steps 15, 23)

Derivation path: 36.508 table 4.7.2-27
Information Element	Value/Remark	Comment	Condition
UE radio capability ID availability	‘000’B	UE radio capability ID not available

Table 9.2.5.3.3.3-5: Message TRACKING AREA UPDATE ACCEPT (step 16)

Derivation path: 36.508 table 4.7.2-24

Information Element

Value/Remark

Comment

Condition

UE radio capability ID

‘01000000000020’H

Type Field (TF): 1

Version ID: 00

Radio Configuration Identifier (RCI): 000000000002

Table 9.2.5.3.3.3-6: Message TRACKING AREA UPDATE REQUEST (step 20)

Derivation path: 36.508 table 4.7.2-27
Information Element	Value/Remark	Comment	Condition
EPS update type	‘000’B000	TA updating
UE radio capability ID availability	‘001’B1	UE radio capability ID available

Table 9.2.5.3.3.3-7: Message TRACKING AREA UPDATE ACCEPT (step 21)

Derivation path: 36.508 table 4.7.2-24
Information Element	Value/Remark	Comment	Condition
UE radio capability ID deletion indication	‘001’B	Network-assigned UE radio capability IDs deletion requested