[{"name":"SP-220297","title":"TS 26.502: 5G multicast-broadcast services; User Service architecture","source":"SA WG4","contact":"Jayeeta Saha","contact-id":85340.0,"tdoctype":"draft TS","for":"Approval","abstract":"Abstract of document: As a deliverable of the 5MBUSA Work Item, TS 26.502 defines the stage 2 User Services architecture for 5G multicast-broadcast services. It builds on the foundations of the recently completed MBS System specification defined by SA WG2 in TS 23.247. Definitions of the following features can be found in TS 26.502: 1. An MBS User Services network architecture placing the scope of this specification in the context of the TS 23.247 reference model. 2. Two distribution methods for the multicast\/broadcast transport of objects and packets respectively. 3. The announcement of MBS User Services. 4. An architectural reference model for MBS User Services, including descriptions of the roles of the principal network and UE functions involved, and the reference points between them. 5. A high-level baseline procedure for the interactions between the system actors. 6. An informative annex documenting common collaboration models. Changes since last presentation to SA Meeting #94: The following additional normative text has been agreed since the presentation of V1.0.0 to SA#94-e: 1. Static domain model, including baseline parameters for the MBS User Service, MBS User Data Ingest Session, MBS Distribution Session and MBS User Service Announcement. 2. Dynamic life-cycle model of the MBS Distribution Session. 3. Stage 2 definitions for the Nmbsf service at reference point Nmb10\/Nmb5, and for the Nmbstf service at Nmb2. NOTE: The detailed stage 3 OpenAPI design for these services is to be completed by CT WG3 based on the above definitions. 4. An architecture documenting how MBS User Services interwork with MBMS User Services in the EPS. 5. An informative annex documenting informative protocol stacks for the different MBS Distribution Sessions. In addition, the delivery of User Service Announcements via MBS Distribution Sessions (a previously contentious issue) is now agreed. Outstanding Issues: The following aspects of TS 26.502 require further contributions: 1. Documenting stage 2 procedures for User Service announcement\/discovery, service initiation\/termination and data transfer. 2. Providing additional detail in the stage 2 definitions of the Nmbsf and Nmbstf services to assist in stage 3 OpenAPI definitions. Contentious Issues: The collaboration model for Group Communication services in Release 17 is the subject of a liaison with SA WG2.","secretary_remarks":"CC#3: Block Approved","agenda_item_sort_order":45,"ainumber":"6.11","ainame":"Specifications for Approval \/ for Information and Approval","tdoc_agenda_sort_order":11900,"status":"approved","reservation_date":"2022-03-09 12:41:38","uploaded":"2022-03-09 16:09:42","revisionof":"","revisedto":"","release":"Rel-17","crspec":"26.502","crspecversion":"2.0.0","workitem":[{"winame":"5MBUSA"}],"crnumber":"","crrevision":"","crcategory":"","tsg_crp":"","lsreplyto":"","lsto":"","Cc":"","lsoriginalls":"","lsreply":"","link":"https:\/\/www.3gpp.org\/ftp\/tsg_sa\/TSG_SA\/TSGS_95E_Electronic_2022_03\/Docs\/SP-220297.zip","group":"SP","meeting":"SP-95-e","year":2022,"uicc_affected":null,"me_affected":null,"ran_affected":null,"cn_affected":null,"clauses_affected":null,"crsinpack":null,"crsinpacknumber":0}]