[{"name":"S2-2105362","title":"LS from IEEE: RE: LS on Time Synchronization","source":"IEEE","contact":"Maurice Pope","contact-id":648,"tdoctype":"LS in","for":"Information","abstract":"1. Re interoperability between 1588 editions: The IEEE 1588 working group created IEEE Std 1588-2019 such as to be backward compatible with IEEE 1588-2008. By that we mean that if you do not use the new optional features in the 2019 edition, then the old ones work the same as in 2008. However, care should be taken to make sure that the same optional features are implemented to allow equipment to interoperate. See IEEE 1588-2019 clause 19 on compatibility between the 2019 and 2008 editions. 2. Re interoperability issues with non-synchronizing BC: The behavior you described is allowed in IEEE 1588-2019, if the other requirements for Boundary Clocks are met. There could be potential interoperability issues between the SMPTE ST2059-2 profile devices and the Boundary Clock in 5GS as described in the Liaison statement. We defer to SMPTE to identify interoperability issues with their profile. 3. Re SMPTE profile update: We defer to SMPTE for any information on updates to their PTP profile. We look forward to continued communication and coordination with 3GPP.","secretary_remarks":"Postponed","agenda_item_sort_order":52,"ainumber":"8.5","ainame":"Enhanced support of Industrial IoT - TSC\/URLLC enhancements (IIoT)","tdoc_agenda_sort_order":18640,"status":"postponed","reservation_date":"2021-07-26 05:56:17","uploaded":"2021-07-26 08:04:39","revisionof":"","revisedto":"","release":"","crspec":"","crspecversion":"","workitem":"","crnumber":"","crrevision":"","crcategory":"","tsg_crp":"","lsreplyto":"","lsto":"SA WG2","Cc":"TSG CT, SMPTE","lsoriginalls":"reply to 3GPP liaison time sync","lsreply":"","link":"https:\/\/www.3gpp.org\/ftp\/tsg_sa\/WG2_Arch\/TSGS2_146E_Electronic_2021-08\/Docs\/S2-2105362.zip","group":"S2","meeting":"S2-146-e","year":2021,"uicc_affected":null,"me_affected":null,"ran_affected":null,"cn_affected":null,"clauses_affected":null,"crsinpack":null,"crsinpacknumber":0}]