Mobile station, network, and handover control method
AssigneeNtt Docomo, Inc.
InventorsHidetoshi Ebara, Masato Maeda
Life of this patent
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Abstract
In a parameter storage device, an offset value corresponding to a moving state (moving speed) and a serving frequency are stored. A parameter identifier reads from the parameter storage device an offset value corresponding to a serving frequency and a moving state. A measuring unit measures a radio communication quality of an inter-frequency cell. A measurement controller adds the offset value to the radio communication quality, to generate control information. The control information is transmitted via a transmitter to a network.
Claims8
A mobile station for communicating with a network having a plurality of base stations in each of a plurality of different cells, comprising:
- circuitry configured to
- identify a moving speed of the mobile station;
- generate control information required by the network in implementing an inter-frequency handover;
- and
- transmit the control information to the network,
- wherein the mobile station and the network are communicable with each other by using one of plural frequencies including a predetermined priority frequency that is used by the mobile station to access the plurality of different cells when the mobile station moves between the plurality of different cells, and
- wherein, when a serving frequency currently being used to communicate with the network is the priority frequency from among the plural frequencies and when the speed exceeds a reference moving speed, the circuitry is configured to change a content of the control information and reduce a number of times per unit time of transmitting the control information to the network.
A method of controlling a handover between a network having plural base stations respectively serving each of a plurality of different cells and a mobile station capable of communicating by using one of plural frequencies,
- wherein the plural frequencies include a predetermined priority frequency that is used by the mobile station to access the plurality of different cells when the mobile station moves between the plurality of different cells,
- the method comprising:
- measuring a moving speed of the mobile station;
- changing, at the mobile station, a content of control information required for implementing a handover to an inter-frequency cell and reducing, at the mobile station, a number of times per unit time of transmitting the control information to the network when a serving frequency is the priority frequency from among the plural frequencies and when the moving speed exceeds a predetermined moving speed;
- and
- transmitting the control information from the mobile station to the network.
Dependencies are inferred from the claim text.