Content for TS 24.161 Word version: 18.0.0

1 Scope p. 6

The present document specifies the procedures of network-based IP flow mobility (NBIFOM). NBIFOM is based on network mobility protocols (i.e. GTP or PMIP) which is performed between 3GPP access and WLAN access network as specified in TS 23.161.

2 References p. 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.

[1]

TR 21.905: "Vocabulary for 3GPP Specifications".

[2]

TS 23.161: "Network-Based IP Flow Mobility (NBIFOM); Stage 2".

[3]

TS 24.008: "Mobile radio interface Layer 3 specification; Core network protocols; Stage 3".

[4]

TS 24.301: "Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS); Stage 3".

[5]

TS 24.302: "Access to the 3GPP Evolved Packet Core (EPC) via non-3GPP access networks; Stage 3".

[6]

TS 24.244: "Wireless LAN control plane protocol for trusted WLAN access to EPC".

[7]

TS 29.274: "Tunnelling Protocol for Control plane (GTPv2-C)".

[8]

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".

3 Definitions, symbols and abbreviations p. 7

3.1 Definitions p. 7

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.

3GPP access is unusable:

the UE detects that usage of 3GPP access is prevented based on a UE implementation specific mechanism.

3GPP access is usable:

3GPP access is not unusable.

WLAN access is unusable:

the UE detects that usage of the WLAN access is prevented based on a UE implementation specific mechanism.

WLAN access is usable:

WLAN access is not unusable.

Multi-access PDN connection:

A PDN connection whose IP flows can be routed over either a 3GPP access or a WLAN access or both. At any single time, each IP flow is only routed over one access.

For the purposes of the present document, the following terms and definitions given in TS 24.302 apply:

3GPP AAA server

RAN rules

TWAG

For the purposes of the present document, the following terms and definitions given in TS 24.301 apply:

A/Gb mode

Iu mode

S1 mode

3.2 Abbreviations p. 7

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.

APN

Access Point Name

EAP

Extensible Authentication Protocol

E-UTRAN

Evolved Universal Terrestrial Radio Access Network

ePDG

Evolved Packet Data Gateway

GERAN

GSM EDGE Radio Access Network

GTP

GPRS Tunnelling Protocol

Information Element

MCM

Multi-connection mode

MME

Mobility Management Entity

NBIFOM

Network-based IP flow mobility

PDN

Packet Data Network

PDN GW

Packet Data Network Gateway

PDP

Packet Data Protocol

PMIP

Proxy Mobile IP version 6

SCM

Single-connection mode

SGSN

Serving GPRS Support Node

TWAG

Trusted WLAN Access Gateway

User Equipment

UTRAN

UMTS Terrestrial Radio Access Network

WLAN

Wireless Local Area Network

WLCP

Wireless LAN control plane protocol

4 General p. 8

This document specifies the following procedures for Network-Based IP Flow Mobility (NBIFOM) as specified in TS 23.161 between the User Equipment (UE) and the network. The present document specifies the following procedures for support of NBIFOM in clause 5:

Initial PDN connection establishment procedure;
Extending NBIFOM traffic flows to additional access network;
IP flow mobility between 3GPP and WLAN;
Removal of an access from a PDN connection;
IP flow mapping procedures;
Handling of change of access usability; and
Handling of Access stratum indication.

For a), b), e), f) and g), the procedures are always initiated by the UE. Specifically, for e) and g), the procedures are performed only if the network-initiated NBIFOM mode is selected as specified in subclause 5.4 of TS 23.161.

For c), the procedure is initiated by:

the UE if the UE-initiated NBIFOM mode is selected as specified in subclause 5.4 of TS 23.161; or
the network if the network-initiated NBIFOM mode is selected as specified in subclause 5.4 of TS 23.161.

For d), the procedure may be initiated by the UE or the network.

This document also defines the coding of the PDUs and parameters for NBIFOM in clause 6.