Content for TR 23.705 Word version: 13.0.0
5 Key issues
6 Solutions
7 Evaluation
8 Conclusions
A Combining RAN and CN-based Solutions for RAN user plane congestion management as a deployment option
$ Change History
5 Key issues p. 8
5.1 Key issue #1: RAN user plane congestion mitigation p. 8
5.2 Key issue #2: RAN user plane congestion awareness p. 8
5.3 Key issue #3: Differentiated treatment for non-deducible service data flows in downlink direction in case of RAN user plane congestion p. 9
5.4 Key issue #4: Video delivery control for congestion mitigation p. 10
5.5 Key issue #5: Uplink traffic prioritization p. 10
6 Solutions p. 11
6.1 CN-based solutions for RAN user plane congestion management p. 11
6.1.1 General architectural requirements p. 11
6.1.2 General description, assumptions and principles p. 12
6.1.3 High-level operation and procedures p. 13
6.1.4 RAN congestion detection solutions p. 14
6.1.4.1 General description, assumptions, and principles p. 14
6.1.4.2 High-level operation and procedures p. 14
6.1.5 RAN congestion reporting solutions p. 15
6.1.5.1 Solution 1.5.1: RAN user plane congestion reporting by GTP-U extension p. 15
6.1.5.1.1 General description, assumptions, and principles p. 15
6.1.5.1.2 High-level operation and procedures p. 16
6.1.5.1.3 Congestion information transfer from the GGSN/PGW to other core network entities p. 16
6.1.5.1.4 Policy control of congestion mitigation p. 18
6.1.5.1.5 Impact on existing entities and interfaces p. 19
6.1.5.1.6 Solution evaluation p. 20
6.1.5.2 Solution 1.5.2: C-plane signalling for RAN user plane congestion reporting p. 20
6.1.5.2.1 Clarification of terminologies p. 20
6.1.5.2.2 General description, assumptions, and principles p. 20
6.1.5.2.3 High-level operation and procedures p. 22
6.1.5.2.4 Impact on existing entities and interfaces p. 26
6.1.5.2.5 Solution evaluation p. 26
6.1.5.3 Solution 1.5.3: RPPF based RAN user plane congestion reporting p. 27
6.1.5.3.1 General description, assumptions, and principles p. 27
6.1.5.3.2 High-level operation and procedures p. 27
6.1.5.3.3 Impacts on existing entities and interfaces p. 29
6.1.5.3.4 Solution evaluation p. 29
6.1.5.4 Solution 1.5.4: Integrated on-path and off-path RAN user plane congestion reporting p. 29
6.1.5.4.1 General description, assumptions, and principles p. 29
6.1.5.4.2 High-level operation and procedures p. 29
6.1.5.4.3 Impacts on existing entities and interfaces p. 33
6.1.5.5 Solution 1.5.5: off-path based RAN user plane congestion reporting p. 34
6.1.6 RAN congestion mitigation solutions p. 38
6.2 RAN-based solutions for RAN user plane congestion management p. 40
6.2.1 Solution 2.1: Flow priority-based traffic differentiation on the same QCI (FPI) p. 40
6.2.1.1 General description, assumptions, and principles p. 40
6.2.1.2 High-level operation and procedures p. 42
6.2.1.3 Impact on existing entities and interfaces p. 43
6.2.1.4 Solution evaluation p. 44
6.2.2 Solution 2.2: Flow and bearer QoS differentiation by RAN congestion handling description (FQI) p. 45
6.2.2.1 General description, assumptions, and principles p. 45
6.2.2.2 High-level operation and procedures p. 47
6.2.2.3 Impact on existing entities and interfaces p. 48
6.2.2.4 Solution evaluation p. 49
6.2.2.5 RAN impacts p. 49
6.2.3 Solution 2.3: Enhancing existing bearer concepts p. 49
6.2.3.1 Solution principles p. 49
6.2.3.2 High-level operation and procedures p. 50
6.2.3.3 Impact on existing entities and interfaces p. 52
6.2.3.4 Solution evaluation p. 52
6.2.4 Solution 2.4: Differentiation of IP flows based on flow level QCI p. 53
6.3 UE-based solutions for RAN user plane congestion management p. 54
7 Evaluation p. 56
8 Conclusions p. 57
8.1 Interim conclusions p. 57
8.2 Final conclusions p. 57
A Combining RAN and CN-based Solutions for RAN user plane congestion management as a deployment option p. 58
A.1 General description, assumptions, and principles p. 58
A.2 High-level operation and procedures p. 59
A.3 Impact on existing entities and interfaces p. 59
A.4 Solution evaluation p. 60
$ Change History p. 61
