LS out Reply to "Reply LS to 3GPP TSG CT4 on support of ECN"
|From||3GPP (Susanna Kooistra)|
3GPP TSG CT4 Meeting #52 C4-111025 Salt Lake City, US 21st – 25th February 2011 Title: LS out Reply to "Reply LS to 3GPP TSG CT4 on support of ECN" Response to: LS (C4-110519, COM 16 – LS 203 – E) on Reply LS to 3GPP TSG CT4 on support of ECN from ITU-T Q3/16 Release: Rel-10 Work Item: ECSRA_LAA-CN Source: 3GPP TSG CT4 To: ITU-T Q3/16 Cc: TSG CT, IETF AVTCORE Contact Person: Name: Phil Hodges Tel. Number: +61 404069546 E-mail Address: Philip . hodges @ Ericsson . com Attachments: C4-111026 1. Overall Description: CT4 thanks ITU-T Q3/16 for their reply liaison regarding Explicit Congestion Notification support in H.248 and is pleased to read that a new WI has been initiated to develop a solution that can be used by 3GPP. CT4 has agreed a stage 3 solution which aims to satisfy the requirements in 3GPP Rel-10 but it is envisaged that some additional work will be required to support interworking to non-3GPP ECN networks. The attached CR includes the stage 3 solution embodied in two packages described in Annexes. CT4 is aware that the CR contains a number of errors which will be corrected in a later revision. The CR was agreed by majority in order to progress the work but it was not agreed by consensus as it was questioned whether the solution should be a single H.248 package or as proposed: a generic package and an additional 3GPP specific package. What is agreed by consensus is that a single ECN solution (whether it consists of multiple packages or not) is desired by 3GPP. Hence despite proposing the second package as a 3GPP package CT4 prefer this being part of a generic ITU-T solution. CT4 asks ITU-T Q3/16 if the solution described in 3GPP Annexes can be developed as a single generic solution, i.e. if the scenarios required by 3GPP can be solved by the generic package(s) and still support all other scenarios. 2. Actions: To ITU-T Q3/16 group. ACTION: CT4 kindly asks ITU-T Q3/16 to consider the CT4 agreed stage 3 solution as input to their generic work on H.248.ECN, consider the above question and provide CT4 with any output drafts on this work from Q3/16. 3. Date of Next CT4 Meetings: CT4#53 9th – 13th May 2011 Tallinn, Estonia CT4#54 22nd – 26th August 2011 Malta