The present document considers the network selection procedures requirements for non-3GPP access types. The network selection principles covered include both automatic and manual selection. Also considered is the operator management of network preferences for non-3GPP access types and how the device accesses networks offered through non-3GPP access.
Non-3GPP access includes any method by which the UE is connected either to a core network or to a server other than by using the radio bearers standardised by 3GPP. Examples are: BlueTooth, WLAN and fixed (wired connections).
UEs considered in this study are UEs able to connect to a non-3GPP network in addition to its 3GPP capabilities (i.e. dual mode, multi-mode UEs).
This work in this TR is applicable to GSM and UMTS and there are no additional considerations of EPS (Evolved Packet System).
Roaming and handover conditions between 3GPP and non-3GPP networks is not under the scope of this document and will not be treated here. They may be referred to, however, for the consistency of use cases and access description consistency.
Connection to a 3GPP operator's core network by WLAN is out of scope where this is I-WLAN. This is covered in .
Use of the Generic Access Network is out of scope.
Considerations of tariffing are out of scope.
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.
: "Vocabulary for 3GPP Specifications".
: "Requirements on 3GPP system to Wireless Local Area Network (WLAN) interworking"
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
The Network Operator which has the commercial relationship with the subscriber and is responsible for billing the subscriber.
A Network Operator that has a commercial relationship with the PNO, by which the SNO provides services to subscribers of the PNO. The relationship could support the seamless handover of services to and from the PNO.
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
Primary Network Operator
Secondary Network Operator
Currently, all UEs have 3GPP access capability (e.g. GSM, GPRS, UMTS); an increasing number of UEs also have WLAN capability. In the future, other types of access may be incorporated into UEs (e.g. WiMax). The network selection procedure for 3GPP access is defined in 3GPP specifications; the procedure for Interworked WLAN (I-WLAN) is also defined. There are no specifications for how the UE should choose non-3GPP access types, however.
In some cases, it may be required for the UE to choose a non-3GPP access type either initiated by the HPLMN or the end user or automatically by the UE. The mechanism for doing this has not been defined and so this study will consider what mechanisms should be in place to cover this.
Also, how the UE should behave when there is no preference expressed should be considered.