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TR 23.742 (SA2)
Study on enhancements to
the Service-Based Architecture

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V16.0.0 (Wzip)  2018/12  131 p.

Rapporteur:  Dr. Sun, Tao

This technical report studies and evaluates architecture enhancements on potential optimizations to the Release 15 Service-Based Architecture (SBA) in order to provide higher flexibility and better modularization of the 5G System for the easier definition of different network slices and to enable better re-use of the defined services. Moreover, the technical report considers mechanisms in order to better support automation and high reliability of network function service(s).

full Table of Contents for  TR 23.742  Word version:   16.0.0

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1  ScopeWord-p. 9
2  ReferencesWord-p. 9
3  Definitions and abbreviationsWord-p. 9
4  Architectural Requirements, Principles and AssumptionsWord-p. 10
4.1  Architectural RequirementsWord-p. 10
4.2  Architectural PrinciplesWord-p. 10
4.3  Architectural AssumptionsWord-p. 10
4.4  Service Definitions and PrinciplesWord-p. 11
5  Key IssuesUpWord-p. 11
5.1  Key Issue 1: Optimal modularization of the systemWord-p. 11
5.2  Key Issue 2: User Plane AspectsWord-p. 12
5.3  Key Issue 3: Improvements to service framework related aspectsWord-p. 12
5.4  Key Issue 4: Architectural support for highly reliable deploymentsWord-p. 13
5.5  Key Issue 5: SBA backward and forward compatibilityWord-p. 13
5.6  Key Issue 6: System flexibility and service provisioningWord-p. 13
5.7  Key Issue 7: RoamingWord-p. 14
6  SolutionsWord-p. 14
6.1  Solution 1: Simply replace N4 with service operationsWord-p. 14
6.2  Solution 2: Amendments to NF Service Interaction modelWord-p. 20
6.3  Solution 3: Distributed Service FrameworkWord-p. 31
6.4  Solution 4: Distributed 3GPP Aware Service FrameworkWord-p. 34
6.5  Solution 5: Flexible Service Framework DeploymentWord-p. 42
6.6  Solution 6: Services Framework enhanced with a Service AgentWord-p. 49
6.7  Solution 7: SBA with stateless and unsticky servicesWord-p. 55
6.8  Solution 8: Support for highly reliable deploymentsWord-p. 60
6.9  Solution 9: Temporary bindings between the service instancesWord-p. 63
6.10  Solution 10: NF/NF services ReliabilityWord-p. 68
6.11  Solution 11: 5GC ReliabilityWord-p. 70
6.12  Solution 12: Common Network Data ServiceUpWord-p. 72
6.13  Solution 13: Utilize System Feature to enable system flexibility and service provisioningWord-p. 73
6.14  Solution 14: NF/ Service Set based Service FrameworkWord-p. 75
6.15  Solution 15: High reliable deployment via the binding information stored at Framework FunctionWord-p. 78
6.16  Solution 16: the optimization for profile of NF/NF service instanceWord-p. 81
6.17  Solution 17: Modularization based on NF Services onlyUpWord-p. 83
6.18  Solution 18: Further AMF modularizationWord-p. 87
6.19  Solution 19: UPF Services introduced in 5G eSBAWord-p. 91
6.20  Solution 20: Service Framework based on CAPIFWord-p. 93
6.21  Solution 21: Hierarchical service frameworkWord-p. 102
6.22  Solution 22: Services Framework enhancementWord-p. 104
6.23  Solution 23: Single UPF serviceWord-p. 109
6.24  Solution 24: 5GC Reliability - Resolution for Race conditionWord-p. 111
6.25  Solution 25: Service Group for reliability and flexible deploymemtWord-p. 112
7  EvaluationWord-p. 117
7.1  Design Principles and Criteria for Backward CompatibilityWord-p. 117
7.2  Evaluation of the solutions for Key Issue 4Word-p. 118
8  ConclusionsWord-p. 118
8.1  Conclusions for KI #1 Optimal Modularization of ServicesWord-p. 118
8.2Void
8.3  Conclusions for KI #3 Improvements to service framework related aspectsWord-p. 118
8.4  Conclusions for KI #4 Architectural support for highly reliable deploymentsWord-p. 120
8.5  Conclusions for KI #5 SBA Backward and Forward CompatibilityWord-p. 122
8.6  Conclusions for KI #6 System flexibility and service provisioningUpWord-p. 122
8.7  Conclusions for KI #7 RoamingWord-p. 122
A  3GPP SBA and ETSI NFV conceptsWord-p. 123
B  Example of System FeaturesWord-p. 127
C  Communication options for consumer-producer communication in Rel-16Word-p. 128
D  Change historyWord-p. 131

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