Radio communication system
First Claim
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1. A radio communication system comprising:
- a narrow-band radio base station having narrow-band transmission/reception means for data transmission;
a wide-band radio base station having wide-band transmission means for data transmission; and
a radio terminal having narrow-band transmission/reception means for transmitting/receiving data to/from said narrow-band radio base station and wide-band reception means for receiving data from said wide-band radio base station, wherein said radio terminal measures a received signal strength indicator of a signal transmitted from said narrow-band radio base station, and performs handover processing for said narrow-band radio base station when the measurement result is lower than a predetermined handover threshold level, and said radio terminal includes means for changing the handover threshold level when data is received from said wide-band radio base station.
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Abstract
In a radio communication system having narrow-band up- and down-link radio channels and a wide-band down-link radio channel, when a radio terminal is to receive data through the wide-band down-link radio channel, the narrow-band up- and down-link radio channels are assigned to the radio terminal in advance. With this operation, communication an be performed by using the wide-band down-link radio channel. In addition, the narrow-band up- and down-link radio channels can be used as radio channels for performing control to efficiently transmit data by using the wide-band down-link radio channel.
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Citations
4 Claims
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1. A radio communication system comprising:
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a narrow-band radio base station having narrow-band transmission/reception means for data transmission;
a wide-band radio base station having wide-band transmission means for data transmission; and
a radio terminal having narrow-band transmission/reception means for transmitting/receiving data to/from said narrow-band radio base station and wide-band reception means for receiving data from said wide-band radio base station, wherein said radio terminal measures a received signal strength indicator of a signal transmitted from said narrow-band radio base station, and performs handover processing for said narrow-band radio base station when the measurement result is lower than a predetermined handover threshold level, and said radio terminal includes means for changing the handover threshold level when data is received from said wide-band radio base station.
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2. A radio communication system comprising:
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a narrow-band radio base station having narrow-band transmission/reception means for data transmission;
a wide-band radio base station having wide-band transmission means for data transmission; and
a radio terminal having narrow-band transmission/reception means for transmitting/receiving data to/from said narrow-band radio bane station and wide band reception means far receiving data from said wide-band radio base station, wherein said radio terminal measures a received signal strength indicator of a signal transmitted from said narrow-band radio base station, performs handover processing for said narrow-band radio base station when the measurement result is lower than a predetermined handover threshold level, and performs the handover processing when no data is received from said wide-band radio base station.
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3. A radio communication system comprising:
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a narrow-band radio base station having narrow-band transmission/reception means for data transmission;
a wide-band radio base station having wide-band transmission means for data transmission;
a server for providing a predetermined service through said radio base stations; and
a radio terminal having narrow-band transmission reception means for transmitting/receiving data to/from said narrow-band radio base station and wide-band reception means for receiving data from said wide-band radio base station,wherein said radio terminal includes means for measuring a received signal strength indicator of a signal transmitted from said narrow-band radio base station, and means for transmitting a signal for stopping data transmission from said server to said wide-band radio base station when the measurement result is lower than a predetermined threshold level. - View Dependent Claims (4)
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Specification