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Content for  TR 23.725  Word version:  16.2.0

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5  Key Issuesp. 10

6  Solutionsp. 12

6.1  Solution #1 for Key Issue #1: Redundant user plane paths based on dual connectivityp. 12

6.2  Solution #2 for Key Issue #1: Multiple UEs per device for user plane redundancyp. 20

6.3  Solution #3 for Key Issue #1: Supporting redundant data transmission via single UPF and two RAN nodesp. 25

6.4  Solution #4 for Key Issue #1: Supporting redundant data transmission via single UPF and single RAN nodep. 32

6.5  Solution #5 for Key Issue #2: Duplication of user plane tunnelling during HOp. 35

6.6  Solution #6 for Key Issue #3: Forwarding tunnel between source and target UL CLp. 40

6.7  Solution #7 for Key Issue #1: Replication framework in 3GPP Systemp. 44

6.8  Solution #8 for Key Issue #4: QoS Monitoringp. 47

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 Statep. 54

6.10  Solution #10 for Key Issue #1: Multiple UEs per device for user plane redundancy with broadcast Network Reliability Groupp. 56

6.11  Solution #11 for Key Issue #3: Anchor change for Ethernet PDU Sessionp. 58

6.12  Solution #12 for Key Issue #3: Ethernet PDU Session Anchor Relocationp. 62

6.13  Solution #13 for Key Issue #3: Session continuity enhancement based on the coordination between AF and 5GCp. 65

6.14  Solution #14 for Key Issue #2: Lossless handover by timing coordination with multiple UEs per devicep. 69

6.15  Solution #15 for Key Issue #6: Division of E2E PDBp. 71

6.16  Solution #16 for Key Issue #7: Automatic GBR service recovery after handoverp. 72

6.17  Solution #17 for Key Issue #6: Configuration of CN PDB in NG-RANp. 74

6.18  Solution #18 for Key Issue #6: Deterministic solution based accurate time stamping of packets in downlinkp. 74

6.19  Solution #19 for Key Issue #4: Using control plane procedure on Uu interface for QoS Monitoringp. 75

6.20  Solution #20 for Key Issue #7: SMF starts the pending timer for the non-accepted GBR QoS flowp. 77

6.21  Solution #21 for Key Issue #7: Extending notification control for QoS flow setup and handoverp. 78

6.22  Solution #22 for Key Issue #7: Automatic GBR service recovery after handoverp. 79

6.23  Solution #23 for Key Issue #7: Always On control for URLLC GBR QoS Flowp. 82

6.24  Solution #24 for Key Issues #4 and #6: Accumulated packet delay estimation for QoS monitoring and division of PDBp. 83

7  Overall Evaluationp. 87

8  Conclusionsp. 88

A  Overview of IEEE TSN Frame Replication and Elimination for Reliabilityp. 91

B  A summary of the IETF DetNet activityp. 92

$  Change Historyp. 93


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