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TR 23.725SA2
Study on enhancement of
Ultra-Reliable Low-Latency Communication (URLLC) support
in the 5G Core network (5GC)

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V16.2.0 (Wzip)  2019/06  93 p.

WI Acronym:  FS_5G_URLLC
Rapporteur:  Mr. Ni, HuiHuawei Tech.(UK) Co., Ltd

The objective of this Technical Report is to study and perform an evaluation of potential architecture enhancements for supporting URLLC services in 5G System (5GS). Specifically, the following aspects are covered:
  • Investigate the key issues for meeting the URLLC requirements on latency, jitter and reliability in 5G System as defined in TS 22.261.
  • Study how to minimize the impacts of UE mobility to the latency and jitter between AN and CN, and within CN.
  • Study how to realize transmission with reliability higher than the reliabilities of single user plane tunnel of N3 and N9 and NFs in the user plane path.
  • Study how to monitor the QoS of the QoS flow with URLLC requirement.
  • Study potential impacts to charging and policy control.

full Table of Contents for  TR 23.725  Word version:   16.2.0

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1  ScopeWord-p. 8
2  References
3  Definitions and abbreviationsWord-p. 9
4  Architecture Assumptions
5  Key IssuesWord-p. 10
6  Solutions
6.1  Solution #1 for Key Issue #1: Redundant user plane paths based on dual connectivity
6.2  Solution #2 for Key Issue #1: Multiple UEs per device for user plane redundancyWord-p. 20
6.3  Solution #3 for Key Issue #1: Supporting redundant data transmission via single UPF and two RAN nodes
6.4  Solution #4 for Key Issue #1: Supporting redundant data transmission via single UPF and single RAN node
6.5  Solution #5 for Key Issue #2: Duplication of user plane tunnelling during HO
6.6  Solution #6 for Key Issue #3: Forwarding tunnel between source and target UL CL
6.7  Solution #7 for Key Issue #1: Replication framework in 3GPP SystemWord-p. 44
6.8  Solution #8 for Key Issue #4: QoS Monitoring
6.9  Solution #9 for Key Issue 5, supporting low latency for initial data delivery without requiring that the UE to always be in RRC_Connected State
6.10  Solution #10 for Key Issue #1: Multiple UEs per device for user plane redundancy with broadcast Network Reliability Group
6.11  Solution #11 for Key Issue #3: Anchor change for Ethernet PDU SessionWord-p. 58
6.12  Solution #12 for Key Issue #3: Ethernet PDU Session Anchor Relocation
6.13  Solution #13 for Key Issue #3: Session continuity enhancement based on the coordination between AF and 5GC
6.14  Solution #14 for Key Issue #2: Lossless handover by timing coordination with multiple UEs per device
6.15  Solution #15 for Key Issue #6: Division of E2E PDBWord-p. 71
6.16  Solution #16 for Key Issue #7: Automatic GBR service recovery after handoverUp
6.17  Solution #17 for Key Issue #6: Configuration of CN PDB in NG-RAN
6.18  Solution #18 for Key Issue #6: Deterministic solution based accurate time stamping of packets in downlink
6.19  Solution #19 for Key Issue #4: Using control plane procedure on Uu interface for QoS Monitoring
6.20  Solution #20 for Key Issue #7: SMF starts the pending timer for the non-accepted GBR QoS flowUp
6.21  Solution #21 for Key Issue #7: Extending notification control for QoS flow setup and handoverWord-p. 78
6.22  Solution #22 for Key Issue #7: Automatic GBR service recovery after handover
6.23  Solution #23 for Key Issue #7: Always On control for URLLC GBR QoS Flow
6.24  Solution #24 for Key Issues #4 and #6: Accumulated packet delay estimation for QoS monitoring and division of PDB
7  Overall Evaluation
8  ConclusionsWord-p. 88
A  Overview of IEEE TSN Frame Replication and Elimination for ReliabilityWord-p. 91
B  A summary of the IETF DetNet activityWord-p. 92
C  Change historyWord-p. 93

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