[{"name":"S2-2205467","title":"LS from BBF: BBF 5G-RG requirements for 3GPP Rel.18\/ATSSS (Enhanced Hybrid Access)","source":"BBF","contact":"Lincoln Lavoie","contact-id":39231,"tdoctype":"LS in","for":"Action","abstract":"Dear colleagues, In view of the finalization of the study phase for Rel. 18, BBF has analyzed TR 23.700-53 being developed by 3GPP to enhance the access traffic steering, switching and splitting (ATSSS) support in the 5G system architecture, with particular attention on the aspects relevant to 5G-RG. In the latest 3GPP released specifications, the support for bandwidth aggregation using Multi-Access PDU sessions is specified for TCP-based traffic (with the so called ATSSS-HL); however, traffic splitting for non-TCP traffic is not yet fully supported. One type of non-TCP traffic of high interest to BBF as it is relevant to 5G-RG is Ethernet traffic. A number of fixed broadband services, already deployed in many operators networks for business as well as for residential customers, are based on Layer 2 traffic. The lack of an efficient way to implement traffic splitting on 5G-RG would limit the possibility to enhance these services by exploiting simultaneously the dual connectivity supported by the new generation of 5G-capable CPE. This would be counter-productive to the success of 5G-RG and WWC in the market, as it breaks one of the promises of hybrid access. Therefore, in view of the next normative phase of ATSSS (Rel.18), BBF would kindly ask 3GPP to take into consideration the following proposals: to remove the editor s note in TR 23.700-53 clause 5.1.1 which quotes: Whether support of steering, switching and splitting of Ethernet traffic flows is required is FFS and rather include Ethernet traffic support as mandatory, to ensure that the recommended solution supports non-TCP traffic splitting, in particular Ethernet traffic splitting, and potentially encrypted traffic splitting for a local network behind the 5G-RG. According to a preliminary BBF assessment of the solutions currently under study in context of TR23.700-53, MP-QUIC based approaches only support UDP and IP, but not Ethernet traffic. Conversely, MP-DCCP (MP-DCCP-LL) would support Ethernet traffic splitting, therefore we recommend MP-DCCP to be considered. We would like to thank you in advance for your timely consideration of these matters and look forward to continuing our fruitful cooperation. Looking forward to receiving your feedback, we would like to take the opportunity to inform you that next Broadband Forum meeting is scheduled for September 13-16, 2022. Sincerely, Lincoln Lavoie, Broadband Forum Technical Committee Chair","secretary_remarks":"Response drafted in S2-2206710. Postponed","agenda_item_sort_order":75,"ainumber":"9.3","ainame":"Study on Access Traffic Steering, Switching and Splitting support in the 5GS; Phase 3 (FS_ATSSS_Ph3)","tdoc_agenda_sort_order":14670,"status":"postponed","reservation_date":"2022-07-21 13:33:49","uploaded":"2022-08-01 09:46:43","revisionof":"","revisedto":"S2-2208111","release":"","crspec":"","crspecversion":"","workitem":"","crnumber":"","crrevision":"","crcategory":"","tsg_crp":"","lsreplyto":"","lsto":"SA WG2","Cc":"","lsoriginalls":"LIAISE-542-5G-RG-Hybrid-Access-Requirements-00","lsreply":"","link":"https:\/\/www.3gpp.org\/ftp\/tsg_sa\/WG2_Arch\/TSGS2_152E_Electronic_2022-08\/Docs\/S2-2205467.zip","group":"S2","meeting":"S2-152-e","year":2022,"uicc_affected":null,"me_affected":null,"ran_affected":null,"cn_affected":null,"clauses_affected":null,"crsinpack":null,"crsinpacknumber":0}]