Portable communication terminal and wireless communication system therefore
First Claim
1. A portable communication terminal comprising:
- a plurality of transceivers each corresponding to at least one of a plurality of wireless communication systems, wherein a preferential wireless communication system is given a first priority to be used for reception and transmission of signals;
a data communication speed predictor for predicting a future communication speed of the preferential wireless communication system-based on a pilot signal transmitted from a base station corresponding to the preferential wireless communication;
a wireless communication system selector for selecting an optimal wireless communication system from among the plurality of wireless communication systems in response to the future communication speed of the preferential wireless communication system predicted by the data communication speed predictor;
a wireless communication system changeover instructor for sending a changeover instruction of the wireless communication system to a base station presently used in data communication, when the selected wireless communication system differs from the wireless communication system presently used in data communication; and
a changeover unit for changing the transceiver presently used in data communication to suit the selected wireless communication system.
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Abstract
A portable communication terminal provides multiple transceivers allowing reception and transmission of signals in accordance with multiple wireless communication systems (e.g., cdma2000 1×-EV DO and cdma2000 1× systems). When the predicted future data communication speed becomes lower than the prescribed threshold, the portable communication terminal automatically switches from one system to another. In addition, the portable communication terminal monitors amounts of data that are received by the preset time period (Td) each. That is, if the reception data rate is continuously reduced lower than the prescribed threshold for the prescribed time period (T), the portable communication terminal automatically switches from one system to another. Thus, it is possible to normally provide the user with a good data communication service, regardless of data communication environments.
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Citations
21 Claims
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1. A portable communication terminal comprising:
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a plurality of transceivers each corresponding to at least one of a plurality of wireless communication systems, wherein a preferential wireless communication system is given a first priority to be used for reception and transmission of signals;
a data communication speed predictor for predicting a future communication speed of the preferential wireless communication system-based on a pilot signal transmitted from a base station corresponding to the preferential wireless communication;
a wireless communication system selector for selecting an optimal wireless communication system from among the plurality of wireless communication systems in response to the future communication speed of the preferential wireless communication system predicted by the data communication speed predictor;
a wireless communication system changeover instructor for sending a changeover instruction of the wireless communication system to a base station presently used in data communication, when the selected wireless communication system differs from the wireless communication system presently used in data communication; and
a changeover unit for changing the transceiver presently used in data communication to suit the selected wireless communication system. - View Dependent Claims (2, 3, 4, 5)
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6. A portable communication terminal comprising:
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a multi-reception circuit for receiving signals in accordance with a first wireless communication system and a second wireless communication system respectively;
a multi-transmission circuit for transmitting signals in accordance with the first wireless communication system and the second wireless communication system respectively;
a signal processing circuit for performing prescribed signal processings on received signals and transmitting signals respectively; and
a data communication controller for controlling data communication in such a way that when a future data communication speed that is predicted in advance in response to a pilot signal transmitted thereto from a first base station for the first wireless communication system becomes less than a prescribed threshold, both the multi-reception circuit and the multi-transmission circuit are automatically controlled to suit the second wireless communication system using a second base station. - View Dependent Claims (7, 8)
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9. A wireless data communication network system comprising:
- an exchange;
a plurality of base stations that are managed and controlled by the exchange with respect to a plurality of wireless communication systems respectively; and
a portable communication terminal having capabilities to perform data communications in accordance with the plurality of wireless communication systems respectively, wherein the portable communication terminal sends a changeover instruction of the wireless communication system to a base station corresponding to a preferential wireless communication system which is given a first priority to be used for reception and transmission of signals, so that the portable communication terminal changes the preferential wireless communication system when a future communication speed of the preferential wireless communication system predicted based on a pilot signal transmitted from a base station corresponding to the preferential wireless communication becomes less than a threshold defined in advance. - View Dependent Claims (10, 11, 12, 13)
- an exchange;
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14. A wireless communication device comprising:
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a plurality of transceivers for allowing reception and transmission of signals in accordance with a plurality of wireless communication systems respectively, wherein a preferential wireless communication system is given a first priority to be used for reception and transmission of signals;
a wireless communication system selector for selecting an optimal wireless communication system from among the plurality of wireless communication systems in response to an amount of data received from the preferential wireless communication system in a period defined in advance;
a wireless communication system changeover instructor for sending a changeover instruction of the wireless communication system to the base station presently used in data communication, when the selected wireless communication system differs from the wireless communication system presently used in data communication; and
a changeover unit for changing the transceiver presently used in a data communication to suit the selected wireless communication system. - View Dependent Claims (15, 16, 17)
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18. A wireless communication method for a wireless communication device comprising a plurality of transceivers allowing reception and transmission of signals in accordance with a plurality of wireless communication systems respectively, wherein a preferential wireless communication system is given a first priority to be used for reception and transmission of signals, comprising the steps of:
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measuring an amount of data received from the preferential wireless communication system in a period defined in advance;
selecting an optimal wireless communication system from among the plurality of wireless communication systems in response to the amount of data received from the preferential wireless communication system;
sending a changeover instruction of the wireless communication system to the base station presently used in data communication when the selected wireless communication system differs from the wireless communication system presently used in data communication; and
changing over the transceiver presently used in data communication to suit the selected wireless communication system. - View Dependent Claims (19)
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20. A wireless communication system changeover method for a wireless communication device comprising a plurality of transceivers for allowing reception and transmission of signals in accordance with a plurality of wireless communication systems respectively, wherein a preferential wireless communication system is given a first priority to be used for reception and transmission of signals comprising the steps of:
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measuring a reception data rate from the preferential wireless communication system;
comparing the reception data rate with a threshold defined in advance; and
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allowing a changeover from the preferential wireless communication system to the other wireless communication system if the reception data rate is consecutively lower than the threshold during the period so that the wireless communication device changes over the transceiver to suit the other wireless communication system. - View Dependent Claims (21)
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Specification