3GPP TSGRAN WG3 112e DRAFT R3212659 Online 111 June

3gpp tsg-ran wg3 #112-e draft r3-212659 online, 1-11 june 2020 agenda item: 10.2.1.3 source: interdigital (moderator) title: summ

3GPP TSG-RAN WG3 #112-e DRAFT R3-212659
Online, 1-11 June 2020
Agenda Item: 10.2.1.3
Source: InterDigital (moderator)
Title: Summary of Offline Discussion on CB: # 1203_SONMDT_SuccessHO
Document for: Approval
1Introduction
=============
CB: # 1203_SONMDT_SuccessHO
- Topics to discuss:
- XnAP, NGAP and F1AP impacts of SHR, including which messages to use,
which information to include and how to encode it
- Any other topics based on contributions submitted
- Start with summary of offline, proceed to TPs if there is consensus
(ID - moderator)
Summary of offline disc R3-212659
The current agreements and chair notes on this topic are:
Define “Successful HO Report” as RRC container in XnAP
Xn Signaling to transmit Successful HO Report from the target to the
source: ACCESS AND MOBILITY INDICATION message
NG Signaling to transmit Successful HO Report from the target to the
source: UPLINK RAN CONFIGURATION TRANSFER and DOWNLINK RAN
CONFIGURATION TRANSFER
F1 Signaling to transmit Successful Report from CU to DU: ACCESS AND
MOBILITY INDICATION
We do not consider new successful handover scenarios: too early
success handover, too late success handover and success handover to
wrong cell in this release
“Successful HO Report” is defined as a list
RAN3 considers a UE Identifier (e.g. AP ID) for SHR in F1AP beneficial
if there is no RAN2/RRC UE identifier inside the SHR; RAN3 needs to
wait RAN2 progress before final decision.
FFS whether to introduce UP information in the SHR for DAPS
optimization, RAN3 should confirm the progress of MRO for DAPS before
further study and the detailed content in the SHR should be
collaborated with RAN2.
FFS whether to study the information of SHR which can optimize the
selection of candidate target cells in CHO.
To be continued...
The discussion covers the below documents:
R3-211856
Discussion on successful handover report (CATT)
discussion
R3-212130
Inter-RAT Successful Handover Report (ZTE)
discussion
R3-212131
(TP for SON BL CR for TS 38.413) Successful Handover support (ZTE)
other
R3-212132
(TP for SON BL CR for TS 38.423) Successful Handover support (ZTE)
other
R3-212133
(TP for SON BL CR for TS 38.473) Successful Handover support (ZTE)
other
R3-212250
Successful Handover Report for CHO and DAPS (Ericsson)
discussion
R3-212268
Improving RAN visibility over CHO and DAPS procedures via SHR and RLF
reports (InterDigital)
discussion
As suggested by the vice chair, this discussion will proceed by first
looking at the proposed enhancements to the baseline for SHO and
trying to get consensus, and then as a second part look at endorsing
TPs based on the consensus if possible.
2For the Chairman’s Notes
=========================
Propose the following:
R3-20xxxa, R3-20xxxc merged
R3-20xxxc rev [in xxxg] – agreed
R3-20xxxd rev [in xxxh] – agreed
R3-20xxxe rev [in xxxi] – agreed
R3-20xxxf rev [in xxxj] – endorsed
Propose to capture the following:
Agreement text…
Agreement text…
WA: carefully crafted text…
Issue 1: no consensus
Issue 2: issue is acknowledged; need to further check the impact on
xxx. May be possible to address with a pure st2 change. To be
continued…
3Discussion
===========
3.1Near Failures
----------------
In R3-R3-211856 Discussion on successful handover report, CATT makes
proposals on handling near failures with the following 3 proposals:
Proposal 1: It is proposed source cell to send XNAP/NGAP message to
previous handover source cell in case the near-failure is caused by
the previous handover.
Proposal 2: It is proposed to introduce a message similar to HO Report
or reuse HO Report for the message in P1.
Proposal 3: It is proposed to introduce a T310 report timer similar to
UE reported timer to detect failure type.
What are your positions on these 3 proposals?
Company
Comment
3.2Inter-RAT
------------
In R3-212130 Inter-RAT Successful Handover Report, ZTE proposes: in
order to support inter-RAT SHR, to define a Choice IE type
of“Successful HO Report”in XnAP, NGAP and F1AP.for both NR and LTE.
Examples of the possible TPs are in R3-212131, R3-212132, R3-212133.
What are your positions on supporting inter-RAT SHR in this way?
Company
Comment
3.3UP Information to improve DAPS
---------------------------------
In R3-212250 Ericsson suggests that source and target node (starting
with the source node) would benefit from knowing the interruption
time, the number of lost packets, or the number of duplications due to
packet forwarding. As this information can only be retrieved from the
UPF, they propose to create an LS to RAN2.
What are your positions on this proposal to liase RAN2?
Company
Comment
3.4Candidate cell improvements
------------------------------
In R3-212250 Ericsson and in R3-212268 InterDigital both suggest the
use of SHR to optimize the number and which cells to prepare for CHO.
The Ericsson paper had 3 related proposals:
Proposal 2: Include UP information for CHO and best cell(s)
measurements in the SHR as a means to optimize CHO usage.
Proposal 3: RAN3 to study the optimization of the number of prepared
cells.
Proposal 4: RAN3 to study methods to optimize early and late data
forwarding.
What are your positions on these proposals?
Company
Comment
3.5Any other comments
---------------------
Are there any other topics/comments in this area?
Company
Comment
4Conclusion, Recommendations [if needed]
========================================
5References
===========
1.