[{"name":"S2-1901420","title":"LS from GSMA PACKET: on MME Functionality to Control Emergency Call Bearer Support Indicator","source":"GSMA PACKET","contact":"Maurice Pope","contact-id":648,"tdoctype":"LS in","for":"Action","abstract":"Background: As VoLTE advances and more operators are launching VoLTE roaming, becomes evident the need for requirements on emergency call such as the willing for VPMN to use IMS emergency call for their subscribers and for specific inbound roaming partners, as well as CSFB for other inbound roaming partners. GSMA NG Packet has agreed that 3GPP specifications allow multiple solutions to cover the above-mentioned requirements. However, operators observed, through testing, that many of those solutions (as outlined in the attached document) are not feasible, and GSMA NG Packet would like to see a unified solution that would work with all VoLTE devices. Only feasible solution seems to be the one which relies on EMC BS Indicator in MME, however, its usage appears to be implementation specific. Request to support selective emission of EMC BS flag by the MME based on Home network: In order to control the domain of emergency call per roaming partner, GSMA NG Packet kindly requests SA WG2 to support and implement the 'Emergency bearer service indicator' (EMC BS) by the MME per Home network (roaming partners) (from the earliest possible 3GPP Release). The following table describes different EMC BS configuration options in order to support different emergency call cases for both VPMN's own users and for inbound roamers.","secretary_remarks":"Postponed S2-1900680 from S2#130. Postponed in parallel session","agenda_item_sort_order":11,"ainumber":"5.4","ainame":"IMS and IMS-Related Maintenance","tdoc_agenda_sort_order":10230,"status":"postponed","reservation_date":"2019-02-05 10:23:57","uploaded":"2019-02-05 10:27:19","revisionof":"S2-1900680","revisedto":"","release":"","crspec":"","crspecversion":"","workitem":"","crnumber":"","crrevision":"","crcategory":"","tsg_crp":"","lsreplyto":"","lsto":"SA WG2","Cc":"","lsoriginalls":"Packet 100_202","lsreply":"","link":"http:\/\/www.3gpp.org\/ftp\/tsg_sa\/WG2_Arch\/TSGS2_131_Tenerife\/Docs\/S2-1901420.zip","group":"S2","meeting":"S2-131","year":2019,"uicc_affected":null,"me_affected":null,"ran_affected":null,"cn_affected":null,"clauses_affected":null,"crsinpack":null,"crsinpacknumber":0},
{"name":"S2-1901421","title":"LS from GSMA RILTE: LS to SA WG2 and SA WG5 on VoWiFi - VoLTE handover","source":"GSMA RILTE","contact":"Mats Melander","contact-id":23767,"tdoctype":"LS in","for":"Action","abstract":"NG RILTE has been made aware by several operators about roaming related scenarios, whereby a UE that started a voice session using VoWiFi subsequently performs a handover to VoLTE. This situation was observed to occur regardless of whether the visited network indicated VoLTE support with VoPS (Voice over PS) indication or not. NG RILTE has some questions related to the cited scenario that seem not to be addressed by existing 3GPP specifications: Q1: How can the handover be prevented in situations where the visited network does not send VoPS indication, i.e. it either does not support VoLTE or it supports VoLTE but does not have VoLTE roaming agreement with the home network of the inbound roamer? Q2: How can a handover be prevented in situations where the visited network wants to block handovers in certain TACs from all users (including own users) regardless of roaming agreements? Q3: How can the visited network properly charge a session that is handed over between VoWiFi and VoLTE assuming the visited network supports VoLTE and has a VoLTE roaming agreement with the home network of the inbound roamer?. Action: to SA WG2: NG RILTE kindly asks SA WG2 to respond to the above questions.","secretary_remarks":"Postponed S2-1900681 from S2#130. Final response in S2-1902884","agenda_item_sort_order":11,"ainumber":"5.4","ainame":"IMS and IMS-Related Maintenance","tdoc_agenda_sort_order":10240,"status":"replied to","reservation_date":"2019-02-05 10:23:57","uploaded":"2019-02-05 10:27:19","revisionof":"S2-1900681","revisedto":"","release":"","crspec":"","crspecversion":"","workitem":"","crnumber":"","crrevision":"","crcategory":"","tsg_crp":"","lsreplyto":"","lsto":"SA WG2, SA WG5","Cc":"CT WG1","lsoriginalls":"RILTE67_116","lsreply":"S2-1902884","link":"http:\/\/www.3gpp.org\/ftp\/tsg_sa\/WG2_Arch\/TSGS2_131_Tenerife\/Docs\/S2-1901421.zip","group":"S2","meeting":"S2-131","year":2019,"uicc_affected":null,"me_affected":null,"ran_affected":null,"cn_affected":null,"clauses_affected":null,"crsinpack":null,"crsinpacknumber":0},
{"name":"S2-1901424","title":"LS from CT WG1: LS on VoWiFi - VoLTE handover","source":"CT WG1","contact":"Lena Chaponniere","contact-id":38080,"tdoctype":"LS in","for":"Action","abstract":"In relation to the LS from GSMA NG RILTE (C1-190363\/S2-1900681) on VoWiFi - VoLTE handover, CT WG1 would like to provide the following information to SA WG2: CT WG1 has specified in Rel-15 a UE configuration parameter called 'Allow_handover_PDN_connection_WLAN_and_EPS' in IMS MO TS 24.167 which enables preventing\/allowing handover of the PDN connection providing access to the IMS from WLAN to EPS when the UE is roaming: {...} Action: CT WG1 asks SA WG2 group to take the information above into account.","secretary_remarks":"Response drafted in S2-1902138. Final response in S2-1902884","agenda_item_sort_order":11,"ainumber":"5.4","ainame":"IMS and IMS-Related Maintenance","tdoc_agenda_sort_order":10250,"status":"replied to","reservation_date":"2019-02-05 10:23:57","uploaded":"2019-02-05 10:27:19","revisionof":"","revisedto":"","release":"Rel-15","crspec":"","crspecversion":"","workitem":"","crnumber":"","crrevision":"","crcategory":"","tsg_crp":"","lsreplyto":"","lsto":"SA WG2","Cc":"","lsoriginalls":"C1-190392","lsreply":"S2-1902884","link":"http:\/\/www.3gpp.org\/ftp\/tsg_sa\/WG2_Arch\/TSGS2_131_Tenerife\/Docs\/S2-1901424.zip","group":"S2","meeting":"S2-131","year":2019,"uicc_affected":null,"me_affected":null,"ran_affected":null,"cn_affected":null,"clauses_affected":null,"crsinpack":null,"crsinpacknumber":0},
{"name":"S2-1902138","title":"[DRAFT] Reply LS on VoWiFi - VoLTE handover","source":"Qualcomm Incorporated","contact":"Haris Zisimopoulos","contact-id":57197,"tdoctype":"LS out","for":"Approval","abstract":"To: GSMA NG RILTE. CC: CT WG1, SA WG5. Attachments: None.","secretary_remarks":"Response to S2-1901421 and S2-1901424. Revised in parallel session to S2-1902495.","agenda_item_sort_order":11,"ainumber":"5.4","ainame":"IMS and IMS-Related Maintenance","tdoc_agenda_sort_order":10260,"status":"revised","reservation_date":"2019-02-19 12:25:16","uploaded":"2019-02-19 13:00:22","revisionof":"","revisedto":"S2-1902495","release":"Rel-15","crspec":"","crspecversion":"","workitem":"","crnumber":"","crrevision":"","crcategory":"","tsg_crp":"","lsreplyto":"","lsto":"GSMA NG RILTE","Cc":"CT WG1, SA WG5","lsoriginalls":"","lsreply":"","link":"http:\/\/www.3gpp.org\/ftp\/tsg_sa\/WG2_Arch\/TSGS2_131_Tenerife\/Docs\/S2-1902138.zip","group":"S2","meeting":"S2-131","year":2019,"uicc_affected":null,"me_affected":null,"ran_affected":null,"cn_affected":null,"clauses_affected":null,"crsinpack":null,"crsinpacknumber":0},
{"name":"S2-1902495","title":"[DRAFT] Reply LS to SA WG2 and SA WG5 on VoWiFi - VoLTE handover","source":"SA WG2","contact":"Haris Zisimopoulos","contact-id":57197,"tdoctype":"LS out","for":"Approval","abstract":"To: GSMA NG RILTE. CC: CT WG1, SA WG5. Attachments: None.","secretary_remarks":"Revision of S2-1902138. Revised to S2-1902884.","agenda_item_sort_order":11,"ainumber":"5.4","ainame":"IMS and IMS-Related Maintenance","tdoc_agenda_sort_order":10270,"status":"revised","reservation_date":"2019-02-28 08:47:11","uploaded":"2019-03-08 13:41:31","revisionof":"S2-1902138","revisedto":"S2-1902884","release":"Rel-15","crspec":"","crspecversion":"","workitem":"","crnumber":"","crrevision":"","crcategory":"","tsg_crp":"","lsreplyto":"","lsto":"GSMA NG RILTE","Cc":"CT WG1, SA WG5","lsoriginalls":"","lsreply":"","link":"http:\/\/www.3gpp.org\/ftp\/tsg_sa\/WG2_Arch\/TSGS2_131_Tenerife\/Docs\/S2-1902495.zip","group":"S2","meeting":"S2-131","year":2019,"uicc_affected":null,"me_affected":null,"ran_affected":null,"cn_affected":null,"clauses_affected":null,"crsinpack":null,"crsinpacknumber":0},
{"name":"S2-1902884","title":"Reply LS to SA WG2 and SA WG5 on VoWiFi - VoLTE handover","source":"SA WG2","contact":"Haris Zisimopoulos","contact-id":57197,"tdoctype":"LS out","for":"Approval","abstract":"To: GSMA NG RILTE. CC: CT WG1, SA WG5.","secretary_remarks":"Revision of S2-1902495. Approved","agenda_item_sort_order":11,"ainumber":"5.4","ainame":"IMS and IMS-Related Maintenance","tdoc_agenda_sort_order":10280,"status":"approved","reservation_date":"2019-03-01 16:59:45","uploaded":"2019-03-08 17:09:06","revisionof":"S2-1902495","revisedto":"","release":"Rel-15","crspec":"","crspecversion":"","workitem":"","crnumber":"","crrevision":"","crcategory":"","tsg_crp":"","lsreplyto":"S2-1901424","lsto":"GSMA NG RILTE","Cc":"CT WG1, SA WG5","lsoriginalls":"","lsreply":"","link":"http:\/\/www.3gpp.org\/ftp\/tsg_sa\/WG2_Arch\/TSGS2_131_Tenerife\/Docs\/S2-1902884.zip","group":"S2","meeting":"S2-131","year":2019,"uicc_affected":null,"me_affected":null,"ran_affected":null,"cn_affected":null,"clauses_affected":null,"crsinpack":null,"crsinpacknumber":0}]