Hitachi, Ltd.

Taketoshi Arakawa

Masaki Sakurai

Shigeyuki Sudo

Tatsuo Horikoshi

Eiichiro Takizawa

Takashi Itamiya

Kuniaki Akatsuka

There is provided a hybrid communication terminal which can overcome a drawback that, in performing switching a system between a 3G network and a WiMAX/LTE is performed under control of a mobile unit, when an IP address allocated to a mobile unit from the network differs before and after system switching, an active session of communication application is disconnected so that it is impossible to continue the communication. In automatically switching connection between different systems during communication, in order to conceal from the communication application that an IP address assigned by the network is changed, an exchange of user data with the communication network is performed via a virtual network device where the IP address is always the same.

Hybrid communication terminal

It is provided a communication apparatus connected to first and second wireless networks which performs handover between the first and second wireless networks, including first and second wireless functional units which obtain connection states and wireless quality of the wireless networks. A transmitter and a receiver of the first wireless functional unit are activated, a transmitter of the second wireless functional unit is deactivated, a receiver of the second wireless functional unit is activated and the wireless quality of the first wireless network and the second wireless network are obtained when a connection between the first wireless functional unit and the first wireless network is in a connected state. The transmitter and the receiver of the first wireless functional unit are deactivated, the transmitter and the receiver of the second wireless functional unit are activated and the data suppression process is canceled after the completion of the handover.

Communication apparatus and handover control method

An access point diagnosis unitcontrols a radio access terminal portionincluded in the access point, to execute a test of connection with the access point. A switch within the access point selectively connects the radio access terminal portion, with any of an antenna and radio reception parts of the own access point. In accordance with a failing part, the failure information which contains the failing part and/or a failure content is transmitted from the radio access terminal portionto the radio access terminal(1) along a first path tracing the radio reception part connected by the switch, etc. of the access point, or (2) along a second path tracing the antenna connected by the switch and the other access point

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Yokohama, Japan

Taketoshi Arakawa