VPN subset of RAT

Policy control. The term policy refers to a broad set ofparameters controlling IWCM behavior. Such policiesare predominantly defined by service providers, andcan be classified into the broad categories of static (preconfigured at the UE) or dynamic. As a matter of serviceprovider policy, some limited number of user preferences may also be allowed. The list of policy parametersincludes, but is not limited to, the following:• Policies to configure only a subset of RAT adaptersto be controlled by IWCM under the virtualadapter, resulting in a multi-homed UE interfaceconfiguration, with seamless inter-technologyhandoffs only between the subset of the interfaces grouped under the virtual adapter.• Access network discovery and (re-) selection relatedpolicies, including information available from theANDSF server, preconfigured network selectionpreferences, handover trigger inputs (signal qualityrange thresholds), and scanning parameters. • Mobility mode and options to be used by the specific RAT (client based mobility with CMIP or network based mobility) and IP version (IPv4, IPv6,or dual stack IPv4v6). • Optional (service provider allowed) user preferences(e.g., manual handover with user intervention