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Content for  TS 26.502  Word version:  17.3.0

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4.5.3  MBS User Service parametersp. 23

This entity models an MBS User Service, as provisioned by the MBS Application Provider and as managed by the MBSF. The baseline parameters of an MBS User Service are listed in Table 4.5.3-1 below:
With the exception of Service type, which is an immutable property of an MBS User Service, any of the parameters assigned by the MBS Application Provider may be updated by the MBS Application Provider at any time.
Parameter Cardinality Assigner Description
User Service Identifier1..1MBSFA unique identifier for this MBS User Service in the MBSF.
External service identifiers1..*MBS Application ProviderA unique identifier for this MBS User Service that is also present in the MBS User Service Announcement.
If assigned in a globally unique manner, this identifier may be useful in correlating this MBS User Service with the same service delivered by a different system.
Service type1..1Indicates whether this MBS User Service is distributed via Multicast MBS Session(s) or Broadcast MBS Session(s)
Service class1..1 The class of this MBS User Service, expressed as a fully-qualified term identifier from a controlled vocabulary such as the OMNA BCAST Service Class [16], e.g. urn:oma:bcast:oma_bsc:st:1.0.
Service announcement modes1..*Determines whether the MBS User Service Announcement compiled by the MBSF is advertised to the MBSF Client at reference point MBS-5 and/or advertised to the MBSF Client via the MBS Distribution Session and/or passed back to the MBS Application Provider via reference point Nmb10.
Service names1..*A set of distinguishing names for this MBS User Service, one per language.
Service descriptions1..*A set of descriptions of this MBS User Service, one per language.
Main service language0..1The main language of this MBS User Service.
MBS User Data Ingest Sessions (see clause 4.5.5) are separately provisioned within the scope of an MBS User Service. It is valid for an MBS User Service to have no MBS User Data Ingest Sessions currently provisioned.
An MBS Reception Reporting Configuration (see clause 4.5.4 below) may be separately provisioned within the scope of an MBS User Service.
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4.5.4  MBS Reception Reporting Configuration parametersp. 23

Reception reporting for MBS User Services is for future study.

4.5.5  MBS User Data Ingest Session parametersp. 24

This entity models an MBS User Data Ingest Session, as provisioned by the MBS Application Provider and as managed by the MBSF. The baseline parameters for an MBS User Data Ingest Session are listed in Table 4.5.5-1 below.
The set of active periods may be updated by the MBS Application Provider at any time. The state of constituent MBS Distribution Sessions (and their corresponding MBS Distribution Session Announcements) may need to change as a consequence.
Parameter Cardinality Assigner Description
User Data Ingest Session Identifier1..1MBSFAn identifier for this MBS User Data Ingest Session that is unique in the scope of the parent MBS User Service (see clause 4.5.3).
MBS User Service Announcement0..1The MBS User Service Announcement (see clause 4.5.7) currently associated with this MBS User Data Ingest Session.
Present only if all constituent MBS Distribution Sessions are in the ESTABLISHED or ACTIVE state.
Active periods0..*MBS Application ProviderPeriods of time during which the MBS User Data Ingest Session is active in the MBS System.
If omitted, the MBS User Data Ingest session is intended to be active until further notice.
The MBS User Data Ingest Session is composed of one or more MBS Distribution Sessions (see clause 4.5.6 below) and these shall be provisioned in the same operation as the enclosing MBS User Data Ingest Session. It is not valid for an MBS User Data Ingest Session to have no MBS Distribution Sessions defined.
MBS Distribution Sessions may be added to or removed from an MBS User Data Ingest Session by the MBS Application Provider at any time, subject to the minimum number specified above. The MBS User Service Announcement may need to change as a consequence to refer to a revised set of corresponding MBS Distribution Session Announcements.
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4.5.6  MBS Distribution Session parametersp. 24

This entity models an MBS Distribution Session, as provisioned by the MBS Application Provider and as managed by the MBSF. This MBSF subsequently uses this information to provision a corresponding MBS Distribution Session in the MBSTF.
The following parameters assigned by the MBS Application Provider may be updated by the MBS Application Provider at any time:
  • Target service areas,
  • MBS Frequency Selection Area (FSA) Identifier (applicable only to broadcast Service type)
  • QoS information.
With the exception of the MBS Session Identifier (which is immutable after initial assignment) and the Location-dependent service flag (which is immutable after creation), all other parameters assigned by the MBS Application Provider may be updated by the MBS Application Provider when the MBS Distribution Session is in the INACTIVE state.
The baseline parameters for an MBS Distribution Session that are common to all distribution methods are listed in Table 4.5.6-1 below. All parameters are exposed to the MBS Application Provider except where noted otherwise.
Parameter Cardinality Assigner Description
Distribution Session Identifier1..1MBSFAn identifier for this MBS Distribution Session that is unique within the scope of the MBS User Service (see clause 4.5.3).
State1..1The current state of the MBS Distribution Session: INACTIVE, ESTABLISHED, ACTIVE or DEACTIVATING (see clause 4.6.1).
MBS Session Context1..*As defined in clause 6.9 of TS 23.247 (see NOTE 1).
There shall be one MBS Session Context associated with the MBS Distribution Session unless multiple Target service areas are specified (see below).
MB-UPF tunnel endpoint address0..1The tunnel endpoint address of the MB-UPF that supports this MBS Distribution Session at reference point Nmb9 (see NOTE 1, NOTE 4).
MBMS GW tunnel endpoint address0..1The tunnel endpoint address of the MBMS GW that supports this MBS Distribution Session at reference point SGi-mb (see NOTE 1, NOTE 4).
User Plane traffic flow information0..1Details of the MBS-4-MC User Plane traffic flow to be used by the MBSTF for this MBS Distribution Session, including the multicast group destination address and port number to be used inside the unicast tunnel at reference point Nmb9 (see NOTE 1).
This parameter is mandatory except in the case of Packet Distribution Method operating in Forward-only mode, in which case multicast-addressed packets ingested at reference point Nmb8 are relayed to Nmb9 without changing their address.
MBS Session Identifier0..1MBSF or MBS Application ProviderThe Temporary Mobile Group Identity (TMGI) or Source-Specific Multicast (SSM) IP address of the MBS Session supporting this MBS Distribution Session (see NOTE 2).
Multiple MBS Distribution Sessions within the scope of the same MBS User Service may share the same value if they are location-dependent MBS Services, as defined in clause 6.2.3 of TS 23.247.
TMGI values are allocated by the MBSF in conjunction with the MB-SMF unless supplied by the MBS Application Provider at the time of provisioning.
Target service areas0..*MBS Application ProviderThe set of regions comprising the MBS service area in which this MBS Distribution Session is to be made available (see NOTE 2).
The provided set of regions shall be disjoint with that of every other MBS Distribution Session sharing the same MBS Session Identifier.
A unique MBS Session Context shall be associated with the MBS Distribution Session for each declared service area, distinguishable by its Area Session Identifier.
MBS Frequency Selection Area (FSA) Identifier0..1(Applicable only to broadcast Service type.) Identifies a preconfigured area within which, and in proximity to, the cell(s) announce the MBS FSA ID and the associated frequency corresponding to this MBS Distribution Session (see NOTE 3).
Location-dependent service flag0..1An indication that this MBS Distribution Session corresponds to a location-dependent MBS Session.
If the flag is unset or omitted, the MBS Distribution Session is not location-dependent.
Multiplexed service flag0..1If set, all MBS Distribution Sessions in the scope of the same parent MBS User Data Ingest Session with identical or empty sets of Target service areas shall be multiplexed onto the same MBS Session.
All MBS Distribution Sessions in the multiplex shall be assigned the same MBS Session Identifier.
Restricted membership flag0..1(Applicable only to multicast Service type.) An indication that this MBS Distribution Session is restricted to a set of UEs according to their current subscription status in the MBS System.
If the flag is set, only UEs in the restricted set are permitted to join thls MBS Distribution Session; otherwise, any UE is permitted to join.
QoS information0..1A 5G QoS Identifier (5QI) [2] to be applied to the traffic flow for this MBS Distribution Session (see NOTE 2).
The 5QI information is used by the MBSF to set the Quality of Service for the MBS Session by interacting with the PCF at reference point Nmb12.
Maximum content bit rate1..1The maximum bit rate for content in this MBS Distribution Session.
Maximum content delay0..1The maximum end-to-end content distribution delay that is tolerated for this MBS Distribution Session by the MBS Application Provider.
Distribution method1..1The distribution method for this MBS Distribution Session, as defined in clause 6.
Operating mode0..1The operating mode in the case where multiple modes are defined in clause 6 for the indicated distribution method.
FEC configuration0..1Configuration for Application Level FEC (AL-FEC) information added by the MBSTF to protect this MBS Distribution Session.
The AL-FEC scheme shall be identified using a term from the Reliable Multicast Transport (RMT) controlled vocabulary of FEC Encoding IDs [17] expressed as a fully-qualified URI, e.g. urn:ietf:rmt:fec:encoding:0.
The overhead of AL-FEC protection shall be specified as a proportion of the (unprotected) MBS data, e.g. 1.1 for 10% overhead.
Additional scheme-specific parameters may be signalled in the form of uncontrolled name-value pairs.
Traffic marking information0..1MBS Application Provider or MBSFInformation (e.g. a Differentiated Services Code Point) used by the MBSTF to mark the multicast packets that it conveys to the MB-UPF at reference point Nmb9.
NOTE 1:
Internal parameter not exposed to the MBS Application Provider.
NOTE 2:
Parameter not relevant to the MBSTF.
NOTE 3:
Used to guide frequency selection by the UE for a broadcast MBS Session.
NOTE 4:
At least one of MB-UPF tunnel endpoint address or MBMS GW tunnel endpoint address shall be present.
An MBS Distribution Session Announcement (see clause 4.5.8 below) shall be associated with an MBS Distribution Session when the latter is in the ESTABLISHED or ACTIVE state.
The following MBS Distribution Session parameters are additionally relevant when the distribution method is the Object Distribution Method:
Parameter Cardinality Assigner Description
Object acquisition method1..1MBS Application ProviderIndicates whether the objects(s) are to be pushed into the MBSTF by the MBS Application Provider or whether they are to be pulled from the MBS Application Provider by the MBSTF as part of the corresponding MBS User Data Ingest Session.
In the latter case, the Object acquisition method indicates whether the object(s) are to be retrieved once from the MBS Application Provider at the start of each active period of the corresponding MBS User Data Ingest Session, or whether the MBSTF is required to check their validity periodically, for example once per rotation of an object carousel.
Object acquisition identifiers1..*Identifies the object(s) to be ingested and distributed by the MBSTF during this MBS Distribution Session.
This could be the ingest URL of the object, or the ingest URL of a manifest describing a set of objects, or a reference into a manifest describing a set of objects.
Object ingest base URL0..1MBS Application Provider or MBSFA URL prefix substituted by the MBSTF with the Object distribution base URL prior to distribution of ingested objects.
Assigned by the MBS Application Provider for the pull-based Object acquisition method. Assigned by the MBSF for push-based object acquisition.
If omitted, nothing is removed from the content ingest URL when forming the object distribution URL
Object distribution base URL0..1MBS Application ProviderA URL prefix substituted by the MBSTF in place of the Object ingest base URL prior to distribution of ingested objects.
If present, the optional Object ingest base URL shall also be present.
If omitted, the object distribution URL is the same as the object ingest URL.
Object repair base URL0,,1MBSFA URL prefix substituted by the MBSTF Client in place of the Object distribution base URL when repairing objects not received completely intact from this MBS Distribution Session. The value shall point to the MBS AS.
Present only when object repair is provisioned for this MBS Distribution Session.
The following MBS distribution session are additionally relevant when the distribution method is the Packet Distribution Method:
Parameter Cardinality Assigner Description
Packet ingest method1..1MBS Application ProviderIndicates whether packets are to be ingested using multicast ingest or unicast ingest.
Multicast ingest is valid for Proxy mode only. In this case, the MBSTF shall join a Source-Specific Multicast (SSM) group indicated in MBSTF ingest endpoint addresses parameter.
Unicast ingest is valid for Proxy mode and Forward-only mode. In this case, the MBSTF shall allocate a listening IP address and port number for packet ingest and shall return it to the MBSF in the MBSTF ingest endpoint addresses parameter below.
MBSTF ingest endpoint addresses1..1MBS Application Provider, MBSF, MBSTFThe endpoint addresses used by the MBS Application Provider and MBSTF to establish a connection at reference point Nmb8 prior to the commencement of this MBS User Data Ingest Session.
In the case of Proxy mode, this shall be the Source-Specific Multicast (SSM) endpoint addresses (including the source IP address, destination multicast group address and destination UDP port) nominated by the MBS Application Provider or else by the MBSF.
In the case of Forward-only mode, this shall be the IP addresses and UDP port numbers at the source and destination ends of the content ingest tunnel, nominated respectively by the MBS Application Provider and the MBSTF.
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4.5.7  MBS User Service Announcement parametersp. 28

This entity models an MBS User Service Announcement, which is compiled by the MBSF and used to advertise the current or imminent availability of an MBS User Service in the MBS System. The baseline parameters for an MBS User Service Announcement are listed in Table 4.5.7-1 below:
Parameter Cardinality Assigner Description
External service identifiers1..*MBS Application ProviderA unique identifier used by the MBSF Client to distinguish between MBS User Services.
If assigned in a globally unique manner, this identifier may be useful to the MBSF Client in correlating the MBS User Service with the same service delivered by a different system.
Service class1..1The class of the MBS User Service, expressed as a term identifier from a controlled vocabulary.
Start date-time0..1The point in time from which this MBS User Service Announcement is valid.
If not present, the announcement is already valid.
End date-time0..1The point in time after which this MBS User Service Announcement is no longer valid.
If not present, the announcement is valid indefinitely.
Service names1..*A set of distinguishing names for the MBS User Service, one per language.
Service descriptions1..*A set of descriptions of the MBS User Service, one per language.
Main service language0..1The main language of the MBS User Service.
MBS Distribution Session Announcements1..1MBSFThe set of MBS Distribution Session Announcements (see clause 4.5.8) currently associated with this MBS User Service Announcement.
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4.5.8  MBS Distribution Session Announcement parametersp. 29

This entity models an MBS Distribution Session Announcement, which is compiled by the MBSF and used to advertise the current or imminent availability of an MBS Distribution Session in the MBS System. The baseline parameters for an MBS Distribution Session Announcement are listed in Table 4.5.8-1 below:
Parameter Cardinality Assigner Description
MBS Session Identifier1..1MB-SMFThe Temporary Mobile Group Identity (TMGI) or Source-Specific Multicast (SSM) IP address of the MBS Distribution Session from which this announcement is derived.
MBS Frequency Selection Area (FSA) Identifier0..1MBS Application Provider or MB-SMF(Broadcast MBS Session only.) IIdentifies a preconfigured area within which, and in proximity to, the cell(s) are announcing the MBS FSA ID and the associated frequency corresponding to this MBS Distribution Session Announcement. (see NOTE)
Distribution method1..1MBS Application ProviderThe distribution method (as defined in clause 6) of the MBS Distribution Session from which this announcement is derived.
Session Description parameters1..*MBSFAdditional parameters needed to receive the MBS Distribution Session from which this announcement is derived, including relevant User Plane traffic flow parameters.
NOTE:
Used to guide frequency selection by the UE for a broadcast MBS Session.
The following session announcement parameters are additionally relevant when Distribution method above indicates the Object Distribution Method:
Parameter Cardinality Assigner Description
Object distribution schedule0..1MBS Application ProviderA schedule indicating when individual objects are to be delivered on the corresponding MBS Distribution Session.
Present only when this information has been provided in the Object acquisition identifiers of the corresponding MBS Distribution Session (see Table 4.5.6-2).
Object distribution base URL0..1A URL prefix substituted by the MBSTF Client with the Object repair base URL when repairing objects not received completely intact from the corresponding MBS Distribution Session.
Present only when object repair is provisioned for the corresponding MBS Distribution Session.
Object repair base URL0..1MBSFThe base URL of the MBS AS to be used for object repair of the corresponding MBS Distribution Session.
Present only when object repair is provisioned for the corresponding MBS Distribution Session.
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4.5.9  Mapping of MBS Distribution Session to MBS Session Contextp. 30

Except when it is in the INACTIVE state, an MBS Distribution Session in the MBSF is associated with an MBS Session Context in the MB-SMF. When the MBSF invokes the Nmbsmf_MBSSession service, the parameters defined in clause 6.9 of TS 23.247 shall be populated as indicated in Table 4.5.9-1 below.
MBS Session Context parameter Source Clause Source parameter
StateMBS Distribution Session. 4.5.6State.
Source-Specific Multicast (SSM) IP addressMBS Distribution Session. 4.5.6MBS Session Identifier
TMG
MBS Service AreaMBS Distribution Session. 4.5.6Target service area (see NOTE 2)
Area Session IdentifierAssigned by MB-SMF. 4.5.6Location-dependent service flag
MBS Frequency Selection Area (FSA) ID (see NOTE 1)MBS Distribution Session. 4.5.6MBS Frequency Selection Area
MB-SMFNot applicable to MB-SMF.N/ANot applicable.
AMFDiscovered by MB-SMFN/ANot applicable.
SMFSelected by AMF.N/ANot applicable.
PCF[Selected by MBSF or MB-UPF.]N/ANot applicable.
QoS (flow) informationMBS Distribution Session. 4.5.6QoS information
Tunnel Endpoint Identifier (TEID) for distributionAssigned by MB-SMF.N/ANot applicable.
IP multicast and source address for data distribution?N/ANot applicable.
NG-RAN IP address for data distributionSelected by MB-SMF.N/ANot applicable.
NG-RAN Node ID(s)Not applicable to MB-SMF.N/ANot applicable.
UE IDsNot applicable to MB-SMF.N/ANot applicable.
NOTE 1:
Applicable to Broadcast MBS Session only.
NOTE 2:
Mapping to Tracking Area Identifier (TAI) list and/or Cell ID list performed by MBSF as required.
In addition, the following parameters to the Nmbsmf_MBSSession_Create service operation defined in clause 9.1.3.6 of TS 23.247 shall be populated as indicated in Table 4.5.9-2 below.
MBSSessionCreate input parameter Source Clause Source parameter
MBS Service typeMBS User Service 4.5.3Service type
MBS activation timeMBS User Data Ingest Session 4.5.5Active period
MBS termination time
Indication that any UE may join (see NOTE)MBS Distribution Session 4.5.6Restricted membership flag
[MBS Service requirements or MBS Session information]MBS Distribution Session 4.5.3QoS information
Data Network Name (DNN)Selected by MBSF based on MBS Application Provider authorisation.N/ANot applicable.
Single-Network Slice Selection Assistance Information (S-NSSAI)N/ANot applicable.
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