Content for TS 23.221 Word version: 18.0.0
A Guidance for CSFB and IMS enabled UE implementations in E-UTRAN
A.1 General
A.2 IMS PS Voice preferred
A.3 CS Voice preferred
A.4 IMS PS Voice only
A.5 CS Voice only
A Guidance for CSFB and IMS enabled UE implementations in E-UTRAN |R8| p. 46
A.1 General p. 46
This Annex provides some examples on how the CSFB and IMS capable UE which supports E-UTRAN can make use of the following indications/settings prior to accessing E-UTRAN:
- "CS Voice only", "IMS PS Voice only", "prefer CS Voice with IMS PS Voice as secondary", or "prefer IMS PS Voice with CS Voice as secondary", and
- "Voice centric" or "Data centric".
A.2 IMS PS Voice preferred p. 46
A.2.1 EPS Attach p. 46
The following Figure A.2.1-1 illustrates the UE behaviour when performing non-combined EPS/IMSI attach, with the setting of: "prefer IMS PS Voice with CS Voice as secondary".
Figure A.2.1-1: UE behaviour for IMS PS Voice preferred with CS Voice as secondary, non combined EPS/IMSI attach
(⇒ copy of original 3GPP image)
(⇒ copy of original 3GPP image)
A.2.2 Combined EPS/IMSI attach p. 47
The following Figure A.2.2-1 illustrates the UE behaviour when performing combined EPS/IMSI attach, with the setting of: "prefer IMS PS Voice with CS Voice as secondary".
Figure A.2.2-1: UE behaviour for IMS PS Voice preferred with CS Voice as secondary, combined EPS/IMSI attach
(⇒ copy of original 3GPP image)
(⇒ copy of original 3GPP image)
A.3 CS Voice preferred p. 48
The following Figure A.3-1 illustrates the UE behaviour with the setting of: "prefer CS Voice with IMS PS Voice as secondary".
Figure A.3-1: UE behaviour for CS Voice preferred with IMS PS Voice as secondary
(⇒ copy of original 3GPP image)
(⇒ copy of original 3GPP image)
A.4 IMS PS Voice only p. 49
The following Figure A.4-1 illustrates the UE behaviour with the setting of: "IMS PS Voice only".
A.5 CS Voice only p. 49
The following Figure A.5-1 illustrates the UE behaviour with the setting of: "CS Voice only".
