F.3 PS to CS and CS to PS dual radio access transfer

24.2373GPPIP Multimedia (IM) Core Network (CN) subsystem IP Multimedia Subsystem (IMS) service continuityRelease 17Stage 3TS

F.3.1 Key to interpret dual radio access transfer scenarios

The key to interpret the PS-CS dual radio access transfer scenarios given in table F.3.1.1 is specified below:

– "MAM" represents support of MSC server assisted mid-call feature

– "ALP" represents support of PS to CS dual radio access transfer for calls in alerting phase and CS to PS dual radio access transfer for calls in alerting phase

– "PAP" represents support of PS to CS dual radio access transfer for originating calls in pre-alerting phase and CS to PS dual radio access transfer for originating calls in pre-alerting phase

– "CAS" represents a session with active speech media component, which is a confirmed dialog

– "CIS" represents a session with inactive speech media component, which is a confirmed dialog

– "EAS" represents a session with active speech media component in alerting phase

– "EAST" represents a terminating session with active speech media component in alerting phase

– "EASO" represents an originating session with active speech media component in alerting phase

– "EPS" represents a session with active speech media component in pre-alerting phase

– "EPST" represents a terminating session with active speech media component in pre-alerting phase

– "EPSO" represents an originating session with active speech media component in pre-alerting phase

– "CACS" represents a session with active speech media component and with conference control, which is a confirmed dialog

– "CICS" represents a session with inactive speech media component and with conference control, which is a confirmed dialog

– "Transfer CACS as CAS" refers to the behaviour of the UE to transfer CACS, but without conference control

– "Transfer CICS as CIS" refers to the behaviour of the UE to transfer CICS, but without conference control

– The TI value in the "Result in UE" column:

o (TI set by UE) or (TI set by MSC server) indicates that the TI flag and TI value will be set as part of the 3GPP TS 24.008 [8] procedures by either the UE or the MSC server; and

o TI=<value> indicates that the TI flag is assigned as in the terminating mobile case with the TI value according to the <value>.

NOTE: In the CS to PS dual radio access transfer the TI value is not required.

F.3.2 PS to CS dual radio access transfer scenarios

Table F.3.2.1: PS to CS dual radio access transfer scenarios

UE and Network Support Combination

Access Transfer Scenario

Result in UE

UE supports at least MAM and Network supports MAM only

or

UE supports MAM only and Network supports at least MAM

CAS only

Transfer CAS (TI set by UE) (NOTE 4)

CIS only

Transfer CIS (TI set by UE)

EAS only

Release EAS

EPS only

Release EPS

CAS + CIS

Transfer CAS (TI set by UE) and transfer CIS (TI=1)

CAS + EASO

Transfer CAS (TI set by UE) and release EASO

CAS + EPSO

Transfer CAS (TI set by UE) and release EPSO

CAS + EAST

Transfer CAS (TI set by UE) and release EAST

CAS + EPST

Transfer CAS (TI set by UE) and release EPST

CIS + EASO

Transfer CIS (TI set by UE) and release EASO

CIS + EAST

Transfer CIS (TI set by UE) and release EAST

CIS + EPSO

Transfer CIS (TI set by UE) and release EPSO

CAS + CIS + EAST

Transfer CAS (TI set by UE), transfer CIS (TI=1) and release EAST

CAS + CIS + EPST

Transfer CAS (TI set by UE), transfer CIS (TI=1) and release EPST

UE supports ALP only and Network supports at least ALP

or

UE supports at least ALP and network supports ALP only

CAS only

Transfer CAS (TI set by UE) (NOTE 4)

CIS only

Release CIS

EASO only

Transfer EASO (TI set by UE)

EAST only

Transfer EASO (TI set by MSC server) (NOTE 4)

EPS only

Release EPS

CAS + CIS

Transfer CAS (TI set by UE) and release CIS

CAS + EASO

Transfer CAS (TI set by UE) and release EASO (NOTE 1)

CAS + EASP

Transfer CAS (TI set by UE) and release EPSO

CAS + EAST

Transfer CAS (TI set by UE) and transfer EAST (TI set by MSC server) (NOTE 4)

CAS + EPST

Transfer CAS (TI set by UE) and release EPST

CIS + EASO

Transfer EASO (TI set by UE) and release CIS

CIS + EAST

Transfer EAST (TI set by UE) and release CIS

CIS + EPSO

Release CIS and release EPSO

CAS + CIS + EAST

Transfer CAS (TI set by UE), transfer EAST (TI set by MSC server) and release CIS

CAS + CIS + EPST

Transfer CAS (TI set by UE), release CIS released and release EPST

UE supports ALP+PAP only and Network supports at least ALP+PAP

or

UE supports at least ALP+PAP and Network supports ALP+PAP only

CAS only

Transfer CAS (TI set by UE) (NOTE 4)

CIS only

Release CIS

EAS only

Transfer EAS (TI set by UE)

EPSO only

Transfer EPSO (TI set by UE)

EPST only

Release EPST

CAS + CIS

Transfer CAS (TI set by UE) and release CIS

CAS + EASO

Transfer CAS and release EASO (NOTE 1)

CAS + EPSO

Transfer CAS and release EPSO (NOTE 2)

CAS + EAST

Transfer CAS (TI set by UE) and transfer EAST (TI set by MSC server) (NOTE 4)

CAS + EPST

Transfer CAS (TI set by UE) and release EPST

CIS + EASO

Transfer EASO (TI set by UE) and release CIS

CIS + EAST

Transfer EAST (TI set by UE) and release CIS

CIS + EPSO

Transfer EPSO (TI set by UE) and release CIS

CAS + CIS + EAST

Transfer CAS (TI set by UE), transfer EAST (TI=1) and release CIS

CAS + CIS + EPST

Transfer CAS (TI set by UE), release CIS and release EPST

UE and Network support MAM+ALP+PAP

CAS only

Transfer CAS (TI set by UE) (NOTE 4)

CIS only

Transfer CIS (TI set by UE)

EAS only

Transfer EAS (TI set by UE)

EPSO only

Transfer EPSO (TI set by UE) (NOTE 4)

EPST only

Release EPST

CAS + CIS

Transfer CAS (TI set by UE) and transfer CIS (TI=1)

CAS + EASO

Transfer CAS and release EASO (NOTE 1)

CAS + EPSO

Transfer CAS and release EPSO (NOTE 2)

CAS + EAST

Transfer CAS (TI set by UE) and transfer EAST (TI set by MSC server)

CAS + EPST

Transfer CAS (TI set by UE) and release EPST

CIS + EASO

Transfer CIS (TI set by UE) and transfer EASO (TI=1)

CIS + EAST

Transfer CIS (TI set by UE) and transfer EAST (TI=1)

CIS + EPSO

Transfer CIS (TI set by UE) and transfer EPSO (TI=1)

CAS + CIS + EAST

Transfer CAS (TI set by UE), transfer CIS (TI=1) and release EAST (NOTE 3)

CAS + CIS + EPST

Transfer CAS (TI set by UE), transfer CIS (TI set by MSC server) and release EPST

UE supports MAM+ ALP only and Network supports at least MAM+ALP

or

UE supports

at least MAM+

ALP and Network supports MAM+ALP only

CAS only

Transfer CAS (TI set by UE) (NOTE 4)

CIS only

Transfer CIS (TI set by UE)

EAS only

Transfer EAS (TI set by UE)

EPS only

Release EPS

CAS + CIS

Transfer CAS (TI set by UE) and transfer CIS (TI=1)

CAS + EASO

Transfer CAS and release EASO (NOTE 1)

CAS + EASP

Transfer CAS and release EPSO

CAS + EAST

Transfer CAS (TI set by UE) and transfer EAST (TI set by MSC server)

CAS + EPST

Transfer CAS (TI set by UE) and release EPST

CIS + EASO

Transfer CIS (TI set by UE) and transfer EASO (TI=1)

CIS + EAST

Transfer CIS (TI set by UE) and transfer EAST (TI=1)

CIS + EPSO

Transfer CIS (TI set by UE) and release EPSO

CAS + CIS + EAST

Transfer CAS (TI set by UE), transfer CIS (TI=1) and release EAST (NOTE 3)

CAS + CIS + EPST

Transfer CAS (TI set by UE), Transfer CIS (TI=1) and release EPST

UE has no MAM support and Network supports MAM only

or

UE supports MAM only and Network has no MAM support

CAS only

Transfer CAS (TI set by UE) (NOTE 4)

CIS only

Release CIS

EAS only

Release CIS

EPS only

Release CIS

CAS + CIS

Transfer CAS (TI set by UE) and release CIS

CAS + EAST

Transfer CAS (TI set by UE) and release EAST

CAS + EPST

Transfer CAS (TI set by UE) and release EPST

CIS + EASO

Release CIS and release EASO

CIS + EAST

Release CIS and release EAST

CIS + EPSO

Release CIS and release EPSO

CAS + CIS + EAST

Transfer CAS (TI set by UE), release CIS and release EAST

CAS + CIS + EPST

Transfer CAS (TI set by UE), release CIS and release EPST

NOTE 1: Even though the nework and the UE support transfer of EASO, the EASO is released since the combination CAS and EASO cannot occur in CS.

NOTE 2: Even though the nework and the UE support transfer of EPSO, the EPSO is released since the combination CAS and EPSO cannot occur in CS.

NOTE 3: Even though the UE and network can support the transfer of EAST, the UE will only transfer CAS and CIS and will release EAST since only two calls can be transferred to CS.

NOTE 4: Transfer of CAS, EAST or CAS+EAST do not require a MSC server with a direct SIP interface to IMS.

F.3.3 CS to PS dual radio access transfer scenarios

Table F.3.3.1: CS to PS dual radio access transfer scenarios

UE and Network Support Combination

(NOTE)

Access Transfer Scenario

Result in UE

UE supports at least MAM and Network supports MAM only

or

UE supports MAM only and Network supports at least MAM

CAS only

Transfer CAS

CIS only

Transfer CIS

EAS only

Release EAS

EPS only

Release EPS

CAS + CIS

Transfer CAS and transfer CIS

CAS + EAST

Transfer CAS and release EAST

CAS + EPST

Transfer CAS and transfer EPST

CIS + EASO

Transfer CIS and release EASO

CIS + EAST

Transfer CIS and release EAST

CIS + EPSO

Transfer CIS and release EPSO

UE supports ALP only and Network supports at least ALP

or

UE supports at least ALP and network supports ALP only

CAS only

Transfer CAS

CIS only

Release CIS

EAS only

Transfer EAS

EPS only

Release EPS

CAS + CIS

Transfer CAS and release CIS

CAS + EAST

Transfer CAS and transfer EAST

CAS + EPST

Transfer CAS and release EPST

CIS + EASO

Transfer EASO and release CIS

CIS + EAST

Transfer EAST and release CIS

CIS + EPSO

CIS released by UE and release EPSO

UE supports ALP+PAP only and Network supports at least ALP+PAP

or

UE supports at least ALP+PAP and Network supports ALP+PAP only

CAS only

Transfer CAS

CIS only

Release CIS

EAS only

Transfer EAS

EPSO only

Transfer EPSO

EPST only

Release EPST

CAS + CIS

Transfer CAS and release CIS

CAS + EAST

Transfer CAS and transfer EAST

CAS + EPST

Transfer CAS and release EPST

CIS + EASO

Transfer EASO and release CIS

CIS + EAST

Transfer EAST and release CIS

CIS + EPSO

Transfer EPSO and release CIS

UE and Network support MAM+ALP+PAP

CAS only

Transfer CAS

CIS only

Transfer CIS

EAS only

Transfer EAS

EPSO only

Transfer EPSO

EPST only

Release EPST

CAS + CIS

Transfer CAS and transfer CIS

CAS + EAST

Transfer CAS and transfer EAST

CAS + EPST

Transfer CAS and release EPST

CIS + EASO

Transfer CIS and transfer EASO

CIS + EAST

Transfer CIS and transfer EAST

CIS + EPSO

Transfer CIS and transfer EPSO

UE supports MAM+ ALP only and Network supports at least MAM+ALP

or

UE supports

at least MAM+

ALP and Network supports MAM+ALP only

CAS only

Transfer CAS

CIS only

Transfer CIS

EAS only

Transfer EAS

EPS only

Release EPS

CAS + CIS

Transfer CAS and transfer CIS

CAS + EAST

Transfer CAS and transfer EAST

CAS + EPST

Transfer CAS and release EPST

CIS + EASO

Transfer CIS and transfer EASO

CIS + EAST

Transfer CIS and transfer EAST

CIS + EPSO

Transfer CIS and release EPSO

UE has no MAM support and Network supports MAM only

or

UE supports MAM only and Network has no MAM support

CAS only

Transfer CAS

CIS only

Release CIS

EAS only

Release CIS

EPS only

Release CIS

CAS + CIS

Transfer CAS and release CIS

CAS + EAST

Transfer CAS and release EAST

CAS + EPST

Transfer CAS and release EPST

CIS + EASO

Release CIS and release EASO

CIS + EAST

Release CIS and release EAST

CIS + EPSO

Release CIS and release EASO

NOTE: None of the CS to PS dual radio access transfer scenarios requires an MSC server with a direct SIP interface to IMS.

F.3.4 PS to CS dual access transfer scenarios with conference control

Table F.3.4-1 describes PS to CS dual radio access transfer scenarios considering cases when at least one potential session to transfer is a conference initiated by the UE.

Table F.3.4-1: PS to CS dual radio access transfer scenarios with conference control

UE and Network Support Combination

Access Transfer Scenario

Result in UE

UE supports at least MAM and Network supports MAM only

or

UE supports MAM only and Network supports at least MAM

CACS only

Transfer CACS (NOTE 1).

CICS only

Transfer CICS (NOTE 1).

CACS + CIS

Transfer CACS (NOTE 1) and transfer CIS (TI=1).

CAS + CICS

Transfer CAS (TI set by UE) and transfer CICS (NOTE 2).

CACS + EAST

Transfer CACS (NOTE 1) and release EAST.

CACS + EPST

Transfer CACS (NOTE 1) and release EPST.

CICS + EASO

Transfer CICS (NOTE 1) and release EASO.

CICS + EPSO

Transfer CICS (NOTE 1) and release EPSO.

CACS + CIS + EAST

Transfer CACS (NOTE 1), transfer CIS (TI=1) and release EAST.

CAS + CICS + EAST

Transfer CAS (TI set by UE), transfer CICS (NOTE 2) and release EAST.

CACS + CIS + EPST

Transfer CACS (NOTE 1), transfer CIS (TI=1) and release EPST.

CAS + CICS + EPST

Transfer CAS (TI set by UE) transfer CICS (NOTE 2) and release EPST.

CACS + CICS

Transfer CACS (NOTE 1) and transfer CICS as CIS (TI=1).

CACS + CICS + EAST

Transfer CACS (NOTE 1), transfer CICS as CIS (TI=1) and release EAST.

CACS + CICS + EPST

Transfer CACS (NOTE 1), transfer CICS as CIS (TI=1) and release EPST.

UE supports ALP only and Network supports at least ALP

or

UE supports at least ALP and network supports ALP only

CACS only

Transfer CACS as CAS (TI set by UE).

CICS only

Release CICS.

CACS + CIS

Transfer CACS as CAS (TI set by UE) and release CIS.

CAS + CICS

Transfer CAS (TI set by UE) and release CICS.

CACS + EAST

Transfer CACS as CAS (TI set by UE) and release EAST.

CACS + EPST

Transfer CACS as CAS (TI set by UE) and release EPST.

CICS + EASO

Transfer EASO (TI set by UE) and release CICS

CICS + EPSO

Release CICS and release EPSO.

CACS + CIS + EAST

Transfer CACS as CAS (TI set by UE), transfer EAST (TEI=1) and release CIS.

CAS + CICS + EAST

Transfer CAS (TI=0), transfer EAST (TI=1) and release CICS.

CACS + CIS + EPST

Transfer CACS as CAS (TI set by UE), release CIS and release EPST.

CAS + CICS + EPST

Transfer CAS (TI set by UE), release CICS and release EPST.

CACS + CICS

Transfer CACS as CAS (TI set by UE) and release CICS.

CACS + CICS + EAST

Transfer CACS as CAS (TI set by UE), transfer EAST and release CICS.

CACS + CICS + EPST

Transfer CACS as CAS (TI set by UE), release CICS and release EPST.

UE supports ALP+PAP only and Network supports at least ALP+PAP

or

UE supports at least ALP+PAP and Network supports ALP+PAP only

CACS only

Transfer CACS as CAS (TI set by UE).

CICS only

Release CICS.

CACS + CIS

Transfer CACS as CAS (TI set by UE) and release CIS.

CAS + CICS

Transfer CAS (TI set by UE) and release CICS.

CACS + EAST

Transfer CACS as CAS (TI set by UE) and transfer EAST (TI=1).

CACS + EPST

Transfer CACS as CAS (TI set by UE) and release EPST.

CICS + EASO

Transfer EASO (TI set by UE) and release CICS.

CICS + EPSO

Transfer EPSO (TI set by UE) and release CICS.

CACS + CIS + EAST

Transfer CACS as CAS (TI set by UE), release CIS and release EAST.

CAS + CICS + EAST

Transfer CAS (TI set by UE), transfer EAST (TI=1) and release CICS.

CACS + CIS + EPST

Transfer CACS as CAS (TI set by UE), release CIS and release EPST.

CAS + CICS + EPST

Transfer CAS (TI=0), release CICS and release EPST.

CACS + CICS

Transfer CACS as CAS (TI set by UE) and release CICS.

CACS + CICS + EAST

Transfer CACS as CAS (TI set by UE), transfer EAST (TI=1) and release CICS.

CACS + CICS + EPST

Transfer CACS as CAS (TI set by UE), release CICS and release EPST.

UE and Network support MAM+ALP+PAP

CACS only

Transfer CACS (NOTE 1).

CICS only

Transfer CICS (NOTE 1).

CACS + CIS

Transfer CACS (NOTE 1) and transfer CIS (TI=1).

CAS + CICS

Transfer CAS (TI set by UE) and transfer CICS (NOTE 2).

CACS + EAST

Transfer CACS (NOTE 1) and transfer EAST (TI=1).

CACS + EPST

Transfer CACS (NOTE 1) and release EPST.

CICS + EASO

Transfer CICS (NOTE 1) and transfer EASO (TI=1).

CICS + EPSO

Transfer CICS (NOTE 1) and transfer EPSO (TI=1).

CACS + CIS + EAST

Transfer CACS (NOTE 1), transfer CIS (TI=1) and release EAST.

CAS + CICS + EAST

Transfer CAS (TI set by UE), transfer CICS (NOTE 2) and release EAST.

CACS + CIS + EPST

Transfer CACS (NOTE 1), transfer CIS (TI=1) and release EPST

CAS + CICS + EPST

Transfer CAS (TI set by UE), transfer CICS (NOTE 2) and release EPST.

CACS + CICS

Transfer CACS (NOTE 1), transfer CICS as CIS (TEI=1)

CACS + CICS + EAST

Transfer CACS (NOTE 1), transfer CICS as CIS (TEI=1) and release EAST.

CACS + CICS + EPST

Transfer CACS (NOTE 1), transfer CICS as CIS (TEI=1) and release EPST.

UE supports MAM+ ALP only and Network supports at least MAM+ALP

or

UE supports

at least MAM+

ALP and Network supports MAM+ALP only

CACS only

Transfer CACS (NOTE 1).

CICS only

Transfer CICS (NOTE 1).

CACS + CIS

Transfer CACS (NOTE 1) and transfer CIS (TI=1).

CAS + CICS

Transfer CAS (TI set by UE) and transfer CICS (NOTE 2).

CACS + EAST

Transfer CACS (NOTE 1) and transfer EAST (TI=1).

CACS + EPST

Transfer CACS (NOTE 1) and release EPST.

CICS + EASO

Transfer CICS (NOTE 1) and transfer EASO (TI=1).

CICS + EPSO

Transfer CICS (NOTE 1) and release EPSO.

CACS + CIS + EAST

Transfer CACS (NOTE 1), transfer CIS (TI=1) and release EAST.

CAS + CICS + EAST

Transfer CAS (TI=0), transfer CICS (NOTE 2) and release EAST.

CACS + CIS + EPST

Transfer CACS (NOTE 1), transfer CIS (TI=1) and release EPST.

CAS + CICS + EPST

Transfer CAS (TI set by UE), transfer CICS (NOTE 2) and release EAST.

CACS + CICS

Transfer CACS (NOTE 1) and transfer CICS as CIS (TEI=1).

CACS + CICS + EAST

Transfer CACS (NOTE 1), transfer CICS as CIS (TEI=1) and release EAST.

CACS + CICS + EPST

Transfer CACS (NOTE 1), transfer CICS as CIS (TEI=1) and release EPST.

UE has no MAM support and Network supports MAM only

or

UE supports MAM only and Network has no MAM support

CACS only

Transfer CACS as CAS (TI set by UE).

CICS only

Release CIS.

CACS + CIS

Transfer CACS as CAS (TI set by UE) and release CIS.

CAS + CICS

Transfer CAS (TI set by UE) and release CICS.

CACS + EAST

Transfer CACS as CAS (TI set by UE) and release EAST.

CACS + EPST

Transfer CACS as CAS (TI set by UE) and release EPST.

CICS + EASO

Release CICS and release EASO.

CICS + EPSO

Release CICS and release EPSO.

CACS + CIS + EAST

Transfer CACS as CAS (TI set by UE) and release EAST.

CAS + CICS + EAST

Transfer CAS (TI set by UE), release CICS and release EAST.

CACS + CIS + EPST

Transfer CACS as CAS (TI set by UE), release CIS and release EPST.

CAS + CICS + EPST

Transfer CAS (TI set by UE), release CICS and release EAST.

CACS + CICS

Transfer CACS as CAS (TI set by UE) and release CICS.

CACS + CICS + EAST

Transfer CACS as CAS (TI set by UE), release CICS and release EAST.

CACS + CICS + EPST

Transfer CACS as CAS (TI set by UE), release CICS and release EAST.

NOTE 1: The TI value for the conference is assigned by 3GPP TS 24.008 [8] procedures. TIs are calculated as in the table 9.2.1A-2 with the offsets 0, 2, 3, 4, 5 assigned to the participants in their order in the list of the extracted participants. The transaction identifier of the conference is identical to the transaction identifier assigned to the first participant (offset 0).

NOTE 2: TIs for participants are calculated as in the table 9.2.1A-2 with the offsets 0, 1, 2, 3, 4 assigned to the participants in their order in the list of the extracted participants. The transaction identifier of the conference is identical to the transaction identifier assigned to the first participant (offset 0).

Annex G (informative):
Indication of support for access transfer features