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TR 23.793SA2
Study on Access Traffic Steering, Switch and Splitting support
in the 5G system architecture

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V16.0.0 (Wzip)  2018/12  114 p.

WI Acronym:  FS_ATSSS
Rapporteur:  Miss So, TricciZTE Corporation

The purpose of this document is to study how the 5G System (5GS) can be extended in order to support Access Traffic Steering, Switching and Splitting (ATSSS) between 3GPP and non-3GPP access networks.

full Table of Contents for  TR 23.793  Word version:   16.0.0

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1  ScopeWord-p. 7
2  References
3  Definitions, symbols and abbreviationsWord-p. 9
Access Traffic Steering: The procedure that selects an access network for a new data flow and transfers the traffic of this data flow over the selected access network. Access traffic steering is applicable between 3GPP and non-3GPP accesses.
Access Traffic Switching: The procedure that moves all traffic of an ongoing data flow from one access network to another access network in a way that maintains the continuity of the data flow. Access traffic switching is applicable between 3GPP and non-3GPP accesses.
Access Traffic Splitting: The procedure that splits the traffic of a data flow across multiple access networks. When traffic splitting is applied to a data flow, some traffic of the data flow is transferred via one access and some other traffic of the same data flow is transferred via another access. Access traffic splitting is applicable between 3GPP and non3GPP accesses.
Multi-Access PDU Session: A PDU session whose traffic can be sent over 3GPP access, or over non-3GPP access, or over both accesses.
4  Architectural requirements and assumptions
5  Key issuesWord-p. 10
6  Solutions
6.1  Solution 1: Proposed architecture framework for ATSSS
6.1.1  GeneralWord-p. 14
6.1.2  Functional DescriptionWord-p. 15
6.1.3  MA PDU and URSPWord-p. 16
6.1.4  Architecture DescriptionWord-p. 17
6.1.5  ProceduresWord-p. 19
6.1.6  Control Plane Protocol Stack between UE-AT3SF and UPc-AT3SF
6.1.7  User Plane Protocol Stack options between UE-AT3SF and UPu-AT3SFWord-p. 23
6.1.8  Impacts On Existing Entities and InterfacesUp
6.2  Solution 2: Support of Multi-Access PDU SessionsWord-p. 34
6.3  Solution 3: TFCP (Traffic Flow Control Protocol) based architecture framework for ATSSSWord-p. 50
6.4  Solution 4: Policy for Access Traffic Steering, Switching and Splitting
6.5  Solution 5: Multipath TCP (MPTCP) proxy architectureUp
6.6  Solution 6: Architecture framework with ATSSS rules via NAS and generic user plane Reporting Control ProtocolWord-p. 79
6.7  Solution 7: Traffic Steering using Access Network Performance MeasurementsWord-p. 83
6.8  Solution 8: ATSSS rules for supporting 3GPP RAT differentiationWord-p. 88
6.9  Solution 9: Solution for the UL CL case on the Multi-access PDU sessionsWord-p. 89
6.10  Solution 10: ATSSS Solution using a MA-PDU Session
6.11  Solution 11: Interworking for Multi-Access PDU SessionWord-p. 98
6.12  Solution 12: QoS framework for Multi-Access PDU Session
6.13  Solution 13: PCC support for ATSSS
6.14  Solution 14: N4 support for ATSSS
7  ConclusionsUp
A  Change historyWord-p. 114

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