TS 23.272 ★
CSFB – Circuit Switched FallBack in EPS

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V16.0.0 (PDF) 2020/06 107 p.

V15.0.0 2017/12 107 p.

V14.2.0 2017/12 107 p.

V13.6.0 2017/12 107 p.

V12.6.0 2015/06 103 p.

V11.10.0 2015/06 102 p.

V10.15.0 2014/06 86 p.

V9.15.0 2013/09 76 p.

V8.12.0 2012/06 59 p.

Rapporteur:: Ms. Demel, Sabine Deutsche Telekom AG

3GPP 23.272 - EPS architecture for CS fallback and SMS over SGs

essential Table of Contents for TS 23.272 Word version: 16.0.0

each title, in the ┃ or ┃ area, links to the equivalent title in the CONTENT

2 References Word‑p. 8

3 Definitions and abbreviations Word‑p. 10

4 Overall Description Word‑p. 11

4.1 General Considerations Word‑p. 11

4.2 Reference Architecture Word‑p. 11

4.3 Functional entities Word‑p. 12

4.4 Control plane Word‑p. 16

4.5 Co-existence with IMS services Word‑p. 16

4.6 Emergency Calls Word‑p. 16

4.6a Interaction with IMS Emergency session |R9| Word‑p. 17

4.7 CSFB Priority Call Handling |R10| Word‑p. 17

4.8 CS services handling in specific cases |R10| Word‑p. 18

5 Mobility Management Word‑p. 18

5.1 General Word‑p. 18

5.1A TAI list and LAI allocation |R9| Word‑p. 18

5.2 Attach procedure Word‑p. 19

5.3 Detach procedure Word‑p. 21

5.4 TA/LA Update procedure Word‑p. 24

5.5 Idle Mode Signalling Reduction Word‑p. 27

5.6 Mobility Management for SMS over SGs only UEs Word‑p. 28

5.7 Access to CS services after selecting a non-3GPP access |R11| Word‑p. 28

6 Mobile Originating Call Word‑p. 28

6.1 General Word‑p. 28

6.2 Mobile Originating call in Active Mode - PS HO supported Word‑p. 29

6.3 Mobile Originating call in Active Mode - No PS HO support Word‑p. 31

6.4 Mobile Originating call in Idle Mode Word‑p. 35

6.5 Returning back to E-UTRAN Word‑p. 36

6.6 Mobile Originated or Mobile terminated call rejected by the MME |R9| Word‑p. 37

7 Mobile Terminating Call Word‑p. 38

7.1 General Word‑p. 38

7.2 Mobile Terminating call in idle mode Word‑p. 38

7.3 Mobile Terminating call in Active Mode - PS HO supported Word‑p. 41

7.4 Mobile Terminating call in Active Mode - No PS HO support Word‑p. 44

7.5 Roaming Retry for CS fallback Word‑p. 48

7.5a Roaming Forwarding for CS fallback |R10| Word‑p. 50

7.5b Coexistence of Roaming Retry and Roaming Forwarding for CS fallback |R10| Word‑p. 52

7.6 Returning back to E-UTRAN Word‑p. 52

7.7 Interaction with ISR Word‑p. 52

7.8 Mobile Terminating Call when SGs is not active Word‑p. 54

8 Other CS Services Word‑p. 54

8.1 General Word‑p. 54

8.2 Short Message Service (SMS) Word‑p. 54

8.3 Location Services (LCS) Word‑p. 62

8.4 Other CS Services Word‑p. 66

A Void

B (Normative) CS Fallback to 1xRTT Word‑p. 71

B.1 Overall Description Word‑p. 71

B.2 Procedures Word‑p. 74

B.3 CS Fallback for UEs with dual Rx configuration |R9| Word‑p. 91

C (Normative) SMS in MME |R11| Word‑p. 93

C.1 General Word‑p. 93

C.2 Architecture Word‑p. 93

C.3 Reference Points Word‑p. 94

C.4 Network Entities Word‑p. 95

C.5 Roaming considerations Word‑p. 96

C.6 Unsuccessful Mobile-Terminated SMS Transfer Word‑p. 96

C.7 Information storage Word‑p. 97

C.8 Registration of MME for SMS Word‑p. 98

$ Change history Word‑p. 101

TS 23.272 ★ CSFB – Circuit Switched FallBack in EPS

essential Table of Contents for TS 23.272 Word version: 16.0.0

TS 23.272 ★
CSFB – Circuit Switched FallBack in EPS