The home subscriber server (HSS) and the AAA (Authentication, Authorization and Accounting) server provide the following functions: - mutual authentication of the mobile and the AAA server via the interfaces SWx and STa. This authentication has the effect of opening Wi-Fi access to the mobile; - transfer of the mobile profile comprising a list of access point names (APN) and the quality of service (QoS) level of the S2a tunnel and Wi-Fi interface, to the PGW entity, via the interface S6b, and to trusted Wi-Fi access, via the STa interface. The policy charging and rules function (PCRF) also provides the traffic profile, including the QoS level of the S2a tunnel to the PGW entity, via the Gx interface, and to trusted Wi-Fi access via the Gxa interface. The mobile profile is stored in the HSS entity for mounting the default bearers, and in this case, the presence of the PCRF is optional. The presence of the PCRF entity is mandatory for the mounting of dedicated bearers on the initiative of an application function (AF), whose first example of implementation is the VoLTE (Voice over LTE) that provides telephone service. Architecture Based on Wi-Fi Access The characteristics of the dedicated bearer of the IP packet containing the voice are only stored in the SPR (Subscriber Profile Repository) database associated with the PCRF entity. Trusted WLAN access network (TWAN) includes the following features: - WLAN AN: this feature includes Wi-Fi access points; - TWAG (Trusted WLAN Access Gateway): this function terminates tunnel S2a; - TWAP (Trusted WLAN AAA Proxy): this function terminates the STa interface. The transparent connection mode provides a single connection to the PGW entity without mobility support between the LTE and Wi-Fi radio accesses. The IPv4 and/or IPv6 address of the mobile is provided by the TWAG function: - in the case of a statefull configuration, the TWAG function acts as a DHCP (Dynamic Host Configuration Protocol) server; - in the case of a stateless configuration, the TWAG function broadcasts the 