Handoff method for a communication system of a train
First Claim
1. A mobile communication system, comprising:
- a plurality of fixed radio base stations each of which configures a predetermined wave arrival range and establishes a linked state with a radio device within the wave arrival range to conduct radio communication with the radio device; and
a mobile unit with at least two modules of the radio devices mounted at positions of the mobile unit to be in a wave arrival range of any one of the base stations, the unit including communication controller for controlling the radio devices on the mobile unit, wherein;
the base stations are disposed at positions at which the base stations form wave arrival ranges not overlapping with each other;
the communication controller includes a radio device connecter for establishing a communication network between a plurality of mobile terminals in the mobile unit and at least one radio device selected from a first-end radio device mounted in a first-end section of the mobile unit is linked in a linked state with one of the base stations and a last-end radio device mounted in a last-end section of the mobile unit is linked in a linked state with one of the base stations; and
the radio device connecter establishes a communication network between the first-end radio device and the mobile terminals at occurrence of an event in which once the linked state of the first-end radio device with a first fixed radio base station is released and then a linked state of the first-end radio device with a second fixed radio base station is established, andestablishes a communication network between the last-end radio device and the mobile terminals at occurrence of an event in which once the linked state of the last-end radio device with the first fixed radio base station is released and then a linked state of the last-end radio device with the second fixed radio base station is established.
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Accused Products
Abstract
In a mobile communication system, even when cells formed by fixed radio base stations are separated from each other, the switching operation between the cells is easily carried out to conduct continuous communication. A first-end radio device mounted in a first-end section of a mobile unit and linked with one of fixed radio base stations or a last-end radio device mounted in a last-end section of a mobile unit and linked with one of fixed radio base stations is selected. A communication network is established between the first-end or last-end radio device thus selected and a plurality of mobile terminals in the mobile unit. This makes it possible to construct a communicable zone (a virtual cell) on the mobile unit and hence elongates the ranges of cells formed by the base stations.
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Citations
16 Claims
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1. A mobile communication system, comprising:
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a plurality of fixed radio base stations each of which configures a predetermined wave arrival range and establishes a linked state with a radio device within the wave arrival range to conduct radio communication with the radio device; and a mobile unit with at least two modules of the radio devices mounted at positions of the mobile unit to be in a wave arrival range of any one of the base stations, the unit including communication controller for controlling the radio devices on the mobile unit, wherein; the base stations are disposed at positions at which the base stations form wave arrival ranges not overlapping with each other; the communication controller includes a radio device connecter for establishing a communication network between a plurality of mobile terminals in the mobile unit and at least one radio device selected from a first-end radio device mounted in a first-end section of the mobile unit is linked in a linked state with one of the base stations and a last-end radio device mounted in a last-end section of the mobile unit is linked in a linked state with one of the base stations; and the radio device connecter establishes a communication network between the first-end radio device and the mobile terminals at occurrence of an event in which once the linked state of the first-end radio device with a first fixed radio base station is released and then a linked state of the first-end radio device with a second fixed radio base station is established, and establishes a communication network between the last-end radio device and the mobile terminals at occurrence of an event in which once the linked state of the last-end radio device with the first fixed radio base station is released and then a linked state of the last-end radio device with the second fixed radio base station is established. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A communication control method for use with a mobile communication system comprising a plurality of fixed radio base stations each of which configures a predetermined wave arrival range and establishes a linked state with a radio device within the wave arrival range to conduct radio communication with the radio device and a mobile unit with at least two modules of the radio devices mounted at positions of the mobile unit to be in a wave arrival range of any one of the base stations, the unit including communication controller for controlling the radio devices on the mobile unit, the communication controller including radio device connecter for establishing a communication network between a plurality of mobile terminals in the mobile unit and at least one radio device selected from a first-end radio device mounted in a first-end section of the mobile unit is linked in a linked state with one of the base stations and a last-end radio device mounted in a last-end section of the mobile unit is linked in a linked state with one of the base stations, the method comprising the steps of:
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selecting by the radio device connecter, when the radio device connecter senses occurrence of an event in which once the linked state of the first-end radio device with a first fixed radio base station is released and then a linked state of the first-end radio device with a second fixed radio base station is established, the first-end radio device and establishing a communication network between the first-end radio device and the mobile terminals; and selecting by the radio device connecter, when the radio device connecter senses occurrence of an event in which once the linked state of the last-end radio device with the first fixed radio base station is released and then a linked state of the last-end radio device with the second fixed radio base station is established, the last-end radio device and establishing a communication network between the last-end radio device and the mobile terminals. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification