A

N

Y

Y

Y

PS

CS if available and supported

B

N

Y

N

Y

PS or CS if the emergency session includes at least voice.

PS if the emergency session contains only media other than voice.

PS if first attempt in CS

CS if first attempt in PS

C

N

Y

Y or N

N

PS if ESFB is "Y" (NOTE 5).

Else CS or PS for another 3GPP RAT with EMS or ESFB set to "Y" if available and supported and if the emergency session includes at least voice.

Else PS for another 3GPP RAT with EMS or ESFB set to "Y" if available and supported if the emergency session contains only media other than voice.

PS if first attempt in CS

CS if first attempt in PS

D

Y

N

Y or N

Y or N

CS if the emergency session includes at least voice.

PS if available and EMS or ESFB is "Y" and emergency session contains only media other than voice.

PS if available and EMS or ESFB is "Y"

E

Y

Y

Y

Y

If the emergency session includes at least voice, follow rules in TS 22.101 [8] which say to use the same domain as for a non-EMC (NOTE 2)

PS if the emergency session contains only media other than voice.

PS if first attempt in CS

CS if first attempt in PS

F

Y

Y

Y or N

N

PS if ESFB is "Y" (NOTE 5).

Else CS if the emergency session includes at least voice.

CS if first attempt in PS

PS for another 3GPP RAT if available and supported and EMS or ESFB is "Y" if first attempt in CS.

G

Y

Y

N

Y

CS if the emergency session includes at least voice.

PS if the emergency session contains only media other than voice.

PS

EMC = Emergency Session. EMC includes also normal calls initiated in the CS domain that are treated by the CS CN as emergency calls.

VoIMS = Voice over IMS over PS sessions support as indicated by IMS Voice over PS session supported indication as defined in TS 23.401 [28], TS 23.060 [2] and TS 23.502 [49].

EMS = IMS Emergency Services supported as indicated by Emergency Service Support indicator as defined in TS 23.401 [28], TS 23.060 [2], TS 23.501 [48] and TS 23.502 [49].

ESFB = Emergency Services Fallback for 5GS as defined in TS 23.501 [48] and TS 23.502 [49].

NOTE 1: If the UE selects the CS domain and initiates a normal call using the dialled local emergency number (see clause 7.1.2), and the UE enters limited service state (e.g. due to a Location Registration failing), then the UE camps on an acceptable cell (see TS 23.122 [41]) and may proceed with the EMC by initiating an emergency call in limited service state.

NOTE 2: Use of the same domain as for a non-EMC is restricted to UTRAN, E-UTRAN and NG-RAN access (e.g. excludes WLAN).

NOTE 3: A UE in dual registration mode as defined in TS 23.501 [48] that is registered to both EPC and 5GC assumes attachment, for the purpose of the "PS Attached" column, to whichever of EPC or 5GC indicates EMS or ESFB as "Y". When both EPC and 5GC indicate EMS or ESFB as "Y", the UE shall assume attachment to EPC when camped on or connected to E-UTRA connected to EPC and to 5GC when camped on or connected to NR or E-UTRA connected to 5GC.

NOTE 4: The other 3GPP RAT for row C and row F can be any of UTRA, E-UTRAN connected to EPC, E-UTRA connected to 5GC or NR connected to 5GC that is supported by the UE and differs from the RAT to which the UE is currently attached in the PS domain (or is assumed to be attached based on NOTE 3).

NOTE 5: The condition ‘ESFB is "Y"’ only applies for a UE that is camped on or connected to 5GS via NR or via E-UTRA and that supports Emergency Services Fallback. In that case the emergency call will be provided over E-UTRAN or E-UTRA connected to 5GC as defined in procedures in TS 23.502 [49]. The condition ‘ESFB is "Y"’ is taken into consideration by the UE only when the network has indicated EMS = "N" for the RAT on which the UE is camping or connected.

NOTE 6: For 5GS, the value of the column "EMS" is for the RAT that UE is camped on or is connected to.

T1

Cell-specific RS EPRE

dBm/15kHz

-115

The power levels are such that reselection back to cell 1 should not occur

U – S

Message

1

The UE is switched on.

–

–

2-16

Steps 1 to 15 of the generic test procedure for UE registration (TS 36.508 4.5.2.3-1).

–

–

–

EXCEPTION: In parallel to the event described in step 17 below, if initiated by the UE the generic procedure for IP address allocation in the U-plane specified in TS 36.508 subclause 4.5A.1 takes place performing IP address allocation in the U-plane.

–

–

–

EXCEPTION: IF PDN1_IMS THEN in parallel to the event described in step 17 below the generic procedure for IMS signalling in the U-plane specified in Table 13.1.21.3.2-2 takes place if requested by the UE

–

–

17-19

Steps 16 to 18 of the generic test procedure for UE registration (TS 36.508 4.5.2.3-1).

–

–

Cause the UE to originate emergency call. (see Note 1)

–

–

20

Check: Does the UE transmit an RRCConnectionRequest message on Cell 1?

–>

RRCConnectionRequest

1

P

21

The SS transmits an RRCConnectionSetup message on Cell 1.

<–

RRCConnectionSetup

–

–

22

Check: Does the UE transmit an RRCConnectionSetupComplete message on Cell 1 including an EXTENDED SERVICE REQUEST message with Service type IE set to "mobile originating CS fallback emergency call or 1xCS fallback emergency call"?

–>

RRCConnectionSetupComplete

1

P

–

EXCEPTION: Steps 23a1 to 23b15 describe behaviour that depends on the UE capability; the "lower case letter" identifies a step sequence that takes place if a capability is supported.

–

–

–

–

23a1

IF (px_RATComb_Tested = EUTRA_UTRA), the SS reconfigures:

Cell 1 as a "Suitable cell",

Cell 5 as the "Serving cell".

–

–

–

–

23a2

The SS transmits an RRCConnectionRelease message indicating redirection to cell 5

<–

RRCConnectionRelease

23a3

Check: Does the UE transmit a RRC CONNECTION REQUEST message on Cell 5 with Establishment cause: Emergency Call?

–>

RRC CONNECTION REQUEST

1

P

23a3A1

The SS changes cell 1 power level according to the row “T1” in table 13.1.21.3.2-0

–

–

–

–

23a4

The SS transmits an RRC CONNECTION SETUP message.

<–

RRC CONNECTION SETUP

–

–

23a5

The UE transmits an RRC CONNECTION SETUP COMPLETE message.

–>

RRC CONNECTION SETUP COMPLETE

–

–

–

EXCEPTION: In parallel to the events described in step 23a6 to 23a17 the step specified in Table 13.1.21.3.2-4 takes place.

–

–

–

–

23a6

The UE transmits a CM SERVICE REQUEST with CM Service Type indicating ‘Emergency call establishment.

–>

CM SERVICE REQUEST

–

–

23a7

The SS transmits AUTHENTICATION REQUEST

<–

AUTHENTICATION REQUEST

–

–

23a8

The UE transmits AUTHENTICATION RESPONSE

–>

AUTHENTICATION RESPONSE

–

–

23a9

The SS transmits a SECURITY MODE COMMAND message for the CS domain.

<–

SECURITY MODE COMMAND

–

–

23a10

The UE transmits a SECURITY MODE COMPLETE message.

–>

SECURITY MODE COMPLETE

–

–

23a11

The UE transmits an EMERGENCY SETUP message.

–>

EMERGENCY SETUP

–

–

23a12-23a17

Steps 12 to 17 of the test procedure in TS 34.123-1 [7] subclause 13.2.1.1 are performed.

NOTE: Emergency call is established.

–

–

–

–

23a17A

The SS transmits a SECURITY MODE COMMAND message for the PS domain.

(See Note 2)

<–

SECURITY MODE COMMAND

–

–

23a17B

The UE transmits a SECURITY MODE COMPLETE message.

–>

SECURITY MODE COMPLETE

–

–

23a18

The SS transmits a ROUTING AREA UPDATE ACCEPT.

<–

ROUTING AREA UPDATE ACCEPT

–

–

23a19

The UE sends ROUTING AREA UPDATE COMPLETE.

–>

ROUTING AREA UPDATE COMPLETE

–

–

23b1

IF (px_RATComb_Tested = EUTRA_GERAN), the SS reconfigures:

Cell 1 as a "Suitable cell",

Cell 24 as the "Serving cell".

–

–

–

–

23b2

The SS transmits an RRCConnectionRelease message indicating redirection to cell 24

<–

RRCConnectionRelease

–

–

23b3

Check: Does the UE transmit a CHANNEL REQUEST message on Cell 24 with Establishment cause: Emergency call?

–>

CHANNEL REQUEST

1

P

23b3A1

The SS changes cell 1 power level according to the row “T1” in table 13.1.21.3.2-0

–

–

–

–

23b4

The SS transmits an IMMEDIATE ASSIGNMENT message.

<–

IMMEDIATE ASSIGNMENT

–

–

23b5

The UE transmit a CM SERVICE REQUEST with CM service type IE indicating “Emergency call establishment”

–>

CM SERVICE REQUEST

–

–

23b5A

The UE transmits a Classmark Change message

–>

CLASSMARK CHANGE

–

–

–

EXCEPTION: Step 23b5B describes behaviour that depends on the UE capability.

–

–

–

–

23b5B

IF pc_UTRA then the UE transmits a Utran Classmark message

–>

UTRAN CLASSMARK CHANGE

–

–

23b6

The SS transmits an AUTHENTICATION REQUEST message.

<–

AUTHENTICATION REQUEST

–

–

23b7

The UE transmits an AUTHENTICATION RESPONSE message.

–>

AUTHENTICATION RESPONSE

–

–

23b7A

The SS transmits a CIPHERING MODE COMMAND message.

<–

CIPHERING MODE COMMAND

–

–

23b7B

The UE transmits a CIPHERING MODE COMPLETE message.

–>

CIPHERING MODE COMPLETE

–

–

23b8

The UE transmits an EMERGENCY SETUP message.

–>

EMERGENCY SETUP

–

–

23b9-23b15

Steps 11 to 17 of the generic test procedure in TS 51.010-1 subclause 10.2.3 are performed on Cell 24.

NOTE: the CS call setup is completed.

–

–

–

–

23b16

The SS transmits DISCONNECT.

<–

DISCONNECT

–

–

23b17

The UE transmits RELEASE..

–>

RELEASE

–

–

23b18

The SS transmits RELEASE COMPLETE.

<–

RELEASE COMPLETE

–

–

23b19

The SS transmits CHANNEL RELEASE, with GPRS Resumption Field set to 1

<–

CHANNEL RELEASE

–

–

23b20-23b30

Steps 1 to 11 of the generic test procedure in TS 36.508 sub clause 6.4.2.9 are performed.

–

–

–

–

–

At the end of this test procedure sequence, the UE is in end state GERAN idle (G1) according to TS 36.508.

–

–

–

–

U – S

Message

1-5

Registration procedure according Table 13.1.21.3.2-3.

–

–

–

–

UE

SS

1

TS 34.229-1 Annex C.17 or TS 34.229-1 C.18.

2

Void.

3

Optional P-CSCF address discovery using the DHCP procedure according to TS 34.229-1 Annex C.3 for IPv6 or TS 34.229-1 Annex C.4 for IPv4.

4

🡪

REGISTER

The UE sends initial registration for IMS services.

5

🡨

503 Service Unavailable

The SS sends the default message “503 Service Unavailable” in TS 34.229-1 Annex A.4.2 with the exceptions as described in Table 13.1.21.3.3-5.

U – S

Message

1

The UE transmits a ROUTING AREA UPDATE REQUEST message.

–>

ROUTING AREA UPDATE REQUEST

–

–

Information Element

Value/remark

Comment

Condition

RRCConnectionRequest ::= SEQUENCE {

criticalExtensions CHOICE {

rrcConnectionRequest-r8 SEQUENCE {

establishmentCause

emergency

}

}

}

Information Element

Value/remark

Comment

Condition

Service type

‘0010’B

mobile originating CS fallback emergency call or 1xCS fallback emergency call

CSFB response

Not present

Information Element

Value/remark

Comment

Condition

RRCConnectionRelease ::= SEQUENCE {

criticalExtensions CHOICE {

c1 CHOICE {

rrcConnectionRelease-r8 SEQUENCE {

redirectedCarrierInfo ::= CHOICE {

Utran

f8

}

}

}

Information Element

Value/remark

Comment

Condition

RRCConnectionRelease ::= SEQUENCE {

criticalExtensions CHOICE {

c1 CHOICE {

rrcConnectionRelease-r8 SEQUENCE {

redirectedCarrierInfo ::= CHOICE {

Geran

f11

}

}

}

Retry-after

RFC 3261 

period

3600

duration

Not present

comment

Not present