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ETSI TS 123 292
M00002790
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ETSI TS 123 292 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; IP Multimedia Subsystem (IMS) centralized services; Stage 2 (3GPP TS 23.292 version 14.2.0 Release 14)
standard by European Telecommunications Standards Institute, 05/01/2017
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Full Description
This document specifies the architectural requirements for delivery of consistent services to the user regardless of theattached access type (e.g. CS domain access, or IP-CAN). This is achieved by implementing the services in the IPMultimedia Subsystem (IMS).Consideration is given to how to access specified IMS-based services (see clause 22.4 of TS 22.101 [9]) whilst stillallowing other, bespoke services to be offered by the home operator.
IMS control of services related to those defined in clause 22.4 of TS 22.101 [9] are part of the present scope of thisspecification. However, IMS control of all other types of calls, including emergency calls that utilise TS12, are outsidethe scope of the present release of this specification.
The scope of the specification includes:Session establishment when using CS access for media transmission for an IMS service.Support of Service Continuity as specified in TS 23.237 [12].Support of Single Radio Voice Call Continuity as specified in TS 23.216 [36].Access Domain Selection (ADS).IMS control of services where the media is transported via the CS network (e.g. managing of mid-call services).Service data management.The solution is applicable for UEs with or without ICS functionality, and is applicable for the following deploymentscenarios:An operator who supports for their subscribers only UEs that have ICS functionality.An operator who supports for their subscribers only UEs that do not have ICS functionality.An operator who supports for their subscribers UEs which do and do not have ICS functionality (to differentsubscribers and the same subscribers) ensuring the coexistence of UEs that have and do not have ICSfunctionality.Inbound roaming subscribers on an operator's network that supports either the same or different ICSfunctionality that the inbound roaming subscriber is using, ensuring the coexistence of UEs that have and do nothave ICS functionality.