scope:

The present document studies the behaviour of a multi system terminal that supports both 3GPP and non-3GPP systems. Particular issues handled include, but are not restricted to:

• Whether the system selection or PLMN selection should take higher priority in a multi system terminal.

• Criteria for system change.

• Interaction between the user's and the operator's preferences.

• Support of automatic and manual system selection mode.

• Different methods of system selection and their impact on 3GPP specifications.

• Some areas for possible standardization, to ensure 3GPP compliance and protection of 3GPP networks.

The present document treats non-3GPP networks in a generic way but it applies mainly to the case of 3GPP2/3GPP compliant terminals.