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Mobile terminal receivers with unidirectional network interfaces are not considered as a special case in the standardization of mobile IPv6. For the interaction of unidirectional access technologies (DVB-H, DVB-T) and mobile networks (UMTS, WLAN, WIMAX) in heterogeneous IPv6 environment, there is a challenge for unified mobility and QoS management technologies supporting new interactive broadcast services, such as IP Datacast. This paper discusses protocol enhancements of Mobile IPv6 in order to support interactive QoS based multimedia services in hybrid broadcast and mobile IPv6 environment. Interaction of the link layer tunnelling mechanisms (RFC 3077) with the mobile IPv6 and fast handovers based on "reverse tunnelling info" is used to provide uniform handover support for broadcast and mobile IP services. QoS management for broadcast access Internet network environment is proposed based on resource reservations for the two directions -downstream connection of the unidirectional broadcast network and return tunnel using wireless access network. QoS information base describing the capabilities of the unidirectional access networks and the IP return tunnel network ("feed") is used for enhanced QoS support of interactive services.