Ntt Docomo, Inc.

Keiji Machida

Hiroshi Nakamura

Kazuhiro Watanabe

Itsuma Tanaka

Kazuo Sugiyama

Hironari Kobayashi

Tooru Hasegawa

Takeshi Ujino

Yuusuke Okazaki

Mayumi Takahashi

Location information of a mobile communication terminal is registered promptly. When the mobile communication terminal receives a first location registration response signal, in which a predefined value indicative of a cause of rejecting the registration of the location information is set, the mobile communication terminal transmits a location registration request signal to a second mobile communication network when there is the second mobile communication network over which the mobile communication terminal can communicate, based on the predefined value. When it is determined that there is not the second mobile communication network or the location registration of the mobile communication terminal in the second mobile communication network is not completed, the mobile communication terminal carries out a first location registration operation of retransmitting the location registration request signal to the first mobile communication network.

Location information registration method and mobile communication terminal

The unnecessarily increase of the information amount of subscriber information retained by a local subscriber information management device is prevented even if the number of subscribers increases, so that the limit of the number of subscribers is extended to support the increasing number of subscribers without increasing the capacity of subscriber information retaining means in the local station (local subscriber information management device). Based on information contained in subscriber management informationincluding information representing each mobile terminalacquired by local stationsof a mobile communication systemand subscriber information corresponding to each mobile terminal, the relevant subscriber management informationare selected and processed to be prevented from being retained after call control is performed according to the acquired subscriber management information.

Mobile communication system, local subscriber information management device, and communication information management method

When a location-area MSCreceives an SMS originating signal, an interrogating unitsends an SRIforSM signal including the MSISDN of a receiving terminalto an HLRWhen the location-area MSCreceives an SRIforSMack signal from the HLRa subscriber-identification-information obtaining unitobtains an IMUI contained in the SRIforSMack. An on-origination carrier identifying unitidentifies from the IMUI the carrier to which the receiving terminalsubscribes. The location-area MSCdetermines whether the carriers have an SMS interconnection agreement with each other, on the basis of identification made by an on-origination carrier identifying unit

Interconnection agreement determining system, apparatus, and method

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Yokohama, Japan

Keiji Machida