Mobile communication terminal, mobile communication system, and storage medium
First Claim
1. A mobile communication terminal comprising:
- communication availability determination means which determines whether a second communication network is available, in accordance with movement of the mobile communication terminal from a communication area of a first base station constituting a first communication network to a communication area of a second base station constituting the second communication network which is different from the first communication network;
communication means which performs transmission and reception to enable communications via at least the first communication network; and
restriction means which controls the communication means to restrict communication that uses the first communication network, by controlling transmission power for communication to be reduced to a degree such that the first base station cannot receive a radio wave from the mobile communication terminal but reception by the mobile terminal from the first base station is maintained and the transmission power maintains the communication with the second communication network, when the communication availability determination means determines that the second communication network is available;
wherein the restriction means, when the communication availability determination means determines that a status in which the second communication network is available is changed to a status at which the second communication network is unavailable, controls the transmission power for communication to recover to such a degree that the first base station can be communicated with, so that data transmission using the first communication network is enabled.
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Accused Products
Abstract
When moving from a public wireless area to a local wireless area, a mobile communication terminal transmits its telephone number to a local wireless service authentication server to inquire whether the mobile communication terminal can receive a local wireless service. The local wireless service authentication server, in response to the inquiry, determines whether the telephone number of the mobile communication terminal itself is registered in a local telephone number storage unit. When the number is registered therein, a transmission power level reduction instruction signal is transmitted to the mobile communication terminal. The mobile communication terminal, in response to the reception of the signal, controls the wireless unit to reduce output level of the transmission power in a wireless unit to a level that it can be received by a local base station while it cannot be received by a public base station. This enables restricting communication that uses public wireless network.
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Citations
17 Claims
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1. A mobile communication terminal comprising:
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communication availability determination means which determines whether a second communication network is available, in accordance with movement of the mobile communication terminal from a communication area of a first base station constituting a first communication network to a communication area of a second base station constituting the second communication network which is different from the first communication network; communication means which performs transmission and reception to enable communications via at least the first communication network; and restriction means which controls the communication means to restrict communication that uses the first communication network, by controlling transmission power for communication to be reduced to a degree such that the first base station cannot receive a radio wave from the mobile communication terminal but reception by the mobile terminal from the first base station is maintained and the transmission power maintains the communication with the second communication network, when the communication availability determination means determines that the second communication network is available; wherein the restriction means, when the communication availability determination means determines that a status in which the second communication network is available is changed to a status at which the second communication network is unavailable, controls the transmission power for communication to recover to such a degree that the first base station can be communicated with, so that data transmission using the first communication network is enabled. - View Dependent Claims (2, 3)
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4. A mobile communication system comprising:
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a first communication network; a second communication network which is different from the first communication network; a mobile communication terminal which is configured to perform transmission and reception to enable communication using at least the first communication network; and an authentication unit which determines whether the mobile communication terminal can use the second communication network, wherein the mobile communication terminal comprises; communication inquiry means which, in accordance with movement of the mobile communication terminal from a communication area of a first base station that constitutes the first communication network to a communication area of a second base station that constitutes the second communication network, determines whether the second communication network is available, by sending terminal identification information specific to the mobile communication terminal to the authentication unit; and restriction means which, when being notified by the authentication unit that the second communication network is available, enables communication that uses the second communication network and restricts communication that uses the first communication network by controlling transmission power to a degree such that the first base station cannot receive a radio wave from the mobile communication terminal but reception by the mobile terminal from the first base station is maintained and the transmission power maintains the communication with the second communication network, so that communication using the first communication network is restricted; wherein the restriction means, when a communication availability determination means of the mobile terminal determines that a status in which the second communication network is available is changed to a status at which the second communication network is unavailable, controls the transmission power for communication to recover to such a degree that the first base station can be communicated with, so that data transmission using the first communication network is enabled. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12)
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13. A mobile communication system having an authentication unit which determines whether a mobile communication terminal connected to a first communication network and a second communication network and capable of performing transmission and reception to enable communication using the first communication network can use the second communication network,
wherein the authentication unit comprises: -
terminal identification information storage means which stores terminal identification information identifying a mobile communication terminal that can use the second communication network; terminal identification information reception means which receives the terminal identification information transmitted by the mobile communication terminal; first terminal identification information determination means which determines whether the terminal identification information received by the terminal identification information reception means is stored in the terminal identification information storage means; and first inquiry result notification means which, when the first terminal identification information determination means determines that the received terminal identification information is stored in the terminal identification information storage means, provides a notification to the mobile communication terminal, by transmitting a transmission power reduction instruction signal that instructs the mobile communication terminal to reduce its transmission power to a degree such that a first base station cannot receive a radio wave from the mobile communication terminal but reception by the mobile terminal from the first base station is maintained and the transmission power maintains the communication with the second communication network, a restriction means of the mobile terminal, when a communication availability determination means of the mobile terminal determines that a status in which the second communication network is available is changed to a status at which the second communication network is unavailable, controlling the transmission power for communication to recover to such a degree that the first base station can be communicated with, so that data transmission using the first communication network is enabled, and an inquiry result indicating that the mobile communication terminal can use the second communication network. - View Dependent Claims (14, 15, 16)
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17. A computer-readable storage medium having recorded thereon a program which makes a computer included in a mobile communication terminal operate as:
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communication availability determination means which determines whether a second communication network is available, in accordance with movement of the mobile communication terminal from a communication area of a first base station constituting a first communication network to the communication area of a second base station constituting the second communication network which is different from the first communication network; communication means which performs transmission and reception to enable communications using at least the first communication network; and restriction means which controls the communication means to restrict communication that uses the first communication network, by controlling transmission power for communication to be reduced to a degree such that the first base station cannot receive a radio wave from the mobile communication terminal but reception by the mobile terminal from the first base station is maintained and the transmission power maintains the communication with the second communication network, when the communication availability determination means determines that the second communication network is available; wherein the restriction means, when the communication availability determination means determines that a status in which the second communication network is available is changed to a status at which the second communication network is unavailable, controls the transmission power for communication to recover to such a degree that the first base station can be communicated with, so that data transmission using the first communication network is enabled.
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Specification