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full Table of Contents for  TS 23.501  Word version:   16.3.0

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1…   3…   4…   4.2.4   4.2.5…   4.2.8            4.2.9…   4.3…   4.3.3   4.3.4   4.3.5   4.4…   4.4.6…   4.4.8   5…   5.4…   5.6…   5.7…   5.8…   5.10…   5.16…   5.17   5.18…   5.27…   5.31   5.32   5.33   5.34   5.35…   6…   6.3…   7…   7.2…   8…   8.2.4   8.2.5…   8.3…   A…   D…   E…   F   G…   G.3   G.4…

 

5.16  Support for specific servicesWord-p. 200
5.16.1  Public Warning System
The functional description for supporting Public Warning System for 5G System can be found in TS 23.041.
5.16.2  SMS over NAS
5.16.2.1  General
This clause includes feature description for supporting SMS over NAS (Non-Access Stratum) in 5G System. Support for SMS incurs the following functionality:
  • Support for SMS over NAS transport between UE and AMF. This applies to both 3GPP and Non 3GPP accesses.
  • Support for AMF determining the SMSF for a given UE.
  • Support for subscription checking and actual transmission of MO/MT-SMS transfer by the SMSF.
  • Support for MO/MT-SMS transmission for both roaming and non-roaming scenarios.
  • Support for selecting proper domains for MT SMS message delivery including initial delivery and re-attempting in other domains.
5.16.2.2  SMS over NAS transportWord-p. 201
5.16.3  IMS supportUp
5.16.3.1  General
IP-Connectivity Access Network specific concepts when using 5GS to access IMS can be found in TS 23.228. 5GS supports IMS with the following functionality:
  • Indication toward the UE if IMS voice over PS session is supported.
  • Capability to transport the P-CSCF address(es) to UE.
  • Paging Policy Differentiation for IMS as defined in TS 23.228.
  • IMS emergency service as defined in TS 23.167.
  • Domain selection for UE originating sessions.
  • Terminating domain selection for IMS voice.
  • Support of P-CSCF restoration procedure (clause 5.16.3.9).
  • NRF based P-CSCF discovery (clause 5.16.3.11).
  • NRF or SCP based HSS discovery (clause 5.16.3.12).
5.16.3.2  IMS voice over PS Session Supported Indication over 3GPP access
5.16.3.2a  IMS voice over PS Session Supported Indication over non-3GPP accessWord-p. 202
5.16.3.3  Homogeneous support for IMS voice over PS Session supported indication
5.16.3.4  P-CSCF address deliveryWord-p. 203
5.16.3.5  Domain selection for UE originating sessions / calls
5.16.3.6  Terminating domain selection for IMS voice
5.16.3.7  UE's usage settingWord-p. 204
5.16.3.8  Domain and Access Selection for UE originating SMS
5.16.3.9  SMF support for P-CSCF restoration procedure
5.16.3.10  IMS Voice Service via EPS Fallback or RAT fallback in 5GS
5.16.3.11  P-CSCF discovery and selection [R16]Word-p. 205
5.16.3.12  HSS discovery and selection [R16]
5.16.4  Emergency Services
5.16.4.1  Introduction
Emergency Services are provided to support IMS emergency sessions. "Emergency Services" refers to functionalities provided by the serving network when the network is configured to support Emergency Services. Emergency Services are provided to normally registered UEs and to Emergency Registered UEs, that can be either normally registered or in limited service state. Depending on local regulation, receiving Emergency Services in limited service state does not require a valid subscription. Depending on local regulation and on operator's policy, the network may allow or reject a registration request for Emergency Services (i.e. Emergency Registration) from UEs that have been identified to be in limited service state. Four different behaviours of Emergency Services as defined in TS 23.401 clause 4.3.12.1 are supported.
  • Valid UEs only
  • Only UEs that are authenticated are allowed
  • IMSI required, authentication optional
  • All UEs are allowed.
5.16.4.2  Architecture Reference Model for Emergency ServicesWord-p. 208
5.16.4.3  Mobility Restrictions and Access Restrictions for Emergency Services
5.16.4.4  Reachability ManagementUp
5.16.4.5  SMF and UPF selection function for Emergency ServicesWord-p. 209
5.16.4.6  QoS for Emergency Services
5.16.4.7  PCC for Emergency Services
5.16.4.8  IP Address Allocation
5.16.4.9  Handling of PDU Sessions for Emergency Services
5.16.4.9a  Handling of PDU Sessions for normal services for Emergency Registered UEs
5.16.4.10  Support of eCall Only ModeWord-p. 210
5.16.4.11  Emergency Services Fallback
5.16.5  Multimedia Priority Services
TS 22.153 specifies the service requirements for Multimedia Priority Service (MPS). MPS allows Service Users priority access to system resources in situations such as during congestion, creating the ability to deliver or complete sessions of a high priority nature. Service Users are government-authorized personnel, emergency management officials and/or other authorized users. MPS supports priority sessions on an "end-to-end" priority basis.
MPS is based on the ability to invoke, modify, maintain and release sessions with priority, and deliver the priority media packets under network congestion conditions. MPS is supported in a roaming environment when roaming agreements are in place and where regulatory requirements apply.
5.16.6  Mission Critical ServicesWord-p. 212
MCX Services are based on the ability to invoke, modify, maintain and release sessions with priority, and deliver the priority media packets under network congestion conditions. As specified in TS 22.261 clause 6.8, MCX Users require 5GS functionality that allows for real-time, dynamic, secure and limited interaction with the QoS and policy framework for modification of the QoS and policy framework by authorized users. The limited interaction is based on operator policy, and provides specific limitations on what aspects of the QoS and policy framework an authorized MCX User can modify. MCX Services are supported in a roaming environment when roaming agreements are in place and where regulatory requirements apply.

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