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Content for  TR 23.751  Word version:  15.0.0

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1  Scopep. 6

The present document studies enhancements required for the support of VoIMS via Trusted and Untrusted WLAN access related with QoS differentiation for better user experience.
This includes:
  • potential user plane impacts for the support of QoS differentiation;
  • potential UE-TWAN and UE-ePDG signalling enhancements for the support of QoS differentiation.

2  Referencesp. 6

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
TR 21.905: "Vocabulary for 3GPP Specifications".
TS 23.402: "Architecture enhancements for non-3GPP accesses".
IEEE Std 802.11-2012: "IEEE Standard for Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications".
RFC 4301:  "Security Architecture for the Internet Protocol".
RFC 7296:  "Internet Key Exchange Protocol Version 2 (IKEv2)".
TS 23.139: "3GPP system - fixed broadband access network interworking".
TS 24.302: "Access to the 3GPP Evolved Packet Core (EPC) via non-3GPP access networks; Stage 3".
TS 23.401: "General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access".
GSMA IR.34: "Guidelines for IPX Provider networks".

3  Definitions, symbols and abbreviationsp. 6

3.1  Definitionsp. 6

For the purposes of the present document, the terms and definitions given in TR 21.905 apply.

3.2  Abbreviationsp. 7

For the purposes of the present document, the abbreviations given in TR 21.905 apply.

4  Architectural considerationsp. 7

4.1  Architectural assumptions and requirementsp. 7

It is assumed that:
  • The impacts of solutions proposed by this study can be limited to the UE and ePDG. The IMS subsystem and remaining parts of EPC will not be impacted;
  • The WLANs (e.g. IEEE 802.11 [3]) and the corresponding backhauls to ePDG and TWAG support QoS differentiation;
  • QoS differentiation is supported per GTP bearer over the S2a and S2b interfaces respectively supporting TWAN-PGW connectivity and ePDG-PGW connectivity.
Solutions proposed shall support:
  • QoS differentiation for user plane data e.g. IMS media flows. This includes IP flows that are non-symmetrical.
  • Update/modification of uplink QoS policies at the UE. This typically happens during the setup of an IMS call.

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