This Recommendation describes detailed functional requirements of mobile IPTV@ which is an application of IPTV [ITU-T Y.1901]. It applies to where the IPTV terminal device is connected to the IPTV service provider via an IPTV-enabled mobile network to provide the IPTV services irrespective of changes of the location or technical environment. This Recommendation focuses on the requirements for networking aspects between an IPTV terminal device and an IPTV service provider. This Recommendation does not address the common functional requirements of IPTV service@ which are covered by [ITU-T Y.1901] but provides the requirements specific to mobile IPTV services only. Thus@ these functional requirements are used to develop the detailed specifications of the IPTV functional components which are defined in [ITU-T Y.1910] for support of mobile IPTV.