US 8,428,628 B2Granted

Communication method, mobile terminal, switching device, and radio control device

AssigneeNtt Docomo, Inc.

InventorsItsuma Tanaka, Keisuke Suzuki, Masashi Kanauchi, Kota Fujimura

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Abstract

A communication method according to the present invention includes: transmitting, at a radio base station device (b), broadcast information for notifying a first area and a second area; transmitting, from a first mobile terminal to a radio control device (c), a first location registration request signal for the first area included in the broadcast information, when the first area is not identical to a first area stored as a current location registration area; and transmitting, from a second mobile terminal to the radio control device (c), a second location registration request signal for the second area included in the broadcast information, when the second area is not included in a second area group stored as a current location registration area.

Claims10

Dependent claims

A communication method comprising the steps of:

managing the communication area by dividing the communication area into a plurality of first areas applied in a first mobile communication system and a plurality of second areas applied in a second mobile communication system distinct from the first mobile communication system;
transmitting, at a radio base station device, broadcast information for notifying the first area and the second area under control of the radio base station device;
transmitting, from a first mobile terminal incapable of registering a location thereof with the second areas to the radio base station device, a first location registration request signal for the first area included in the broadcast information, when the first area is not identical to a first area stored as a current location registration area;
and
transmitting, from a second mobile terminal capable of registering a location thereof with the second areas to the radio base station device, a second location registration request signal for the second area included in the broadcast information, when the second area is not included in a second area group stored as a current location registration area,
wherein the first mobile terminal is configured to perform existing location registration processing and ignore the plurality of second areas when the second areas are included in broadcast information transmitted from the radio base station device, and
wherein the second mobile terminal is configured to perform existing location registration processing in an area when the plurality of second areas are not included in broadcast information transmitted from the radio base station device.

4 more elements

A mobile terminal used in a mobile communication system, the mobile terminal comprising:

a location registration area storage unit configured to store, as a current location registration area, one of the plurality of first areas or a second area group including at least one of the plurality of second areas;
and
a location registration processor unit configured to transmit, to a radio base station device, a second location registration request signal for a second area included in broadcast information transmitted from the radio base station device, when the second area is not included in the second area group which is stored by the location registration area storage unit as the current location registration area,
wherein the communication area is managed by being divided into a plurality of first areas applied in a first mobile communication system and a plurality of second areas applied in a second mobile communication system distinct from the first mobile communication system,
wherein, when the mobile terminal is incapable of registering a location thereof with the second areas, the mobile terminal is configured to perform existing location registration processing and ignore the plurality of second areas when the second areas are included in broadcast information transmitted from the radio base station device, and
wherein, when the mobile terminal is capable of registering a location thereof with the second areas, the mobile terminal is configured to perform existing location registration processing in an area when the plurality of second areas are not included in broadcast information transmitted from the radio base station device.

3 more elements

Dependencies are inferred from the claim text.