Radio base station device, radio terminal device, and radio communication system
First Claim
1. A radio base station apparatus in a radio communication system in which different frequency bands are used between uplink where a signal is transmitted from a radio terminal apparatus to the radio base station apparatus and downlink where a signal is transmitted from the radio base status apparatus to the radio terminal apparatus, the apparatus comprising:
- a pilot forming section that forms a first pilot signal, which is a signal for measuring communication quality of the uplink at the radio terminal apparatus; and
a transmission section that transmits the first pilot signal in the downlink in a transmission period for the first pilot signal, using a frequency band used for the uplink; and
a communication quality measurement section that measures communication quality of the uplink based on a second pilot signal transmitted from the radio terminal apparatus in a band in which the communication quality measured at the radio terminal apparatus based on the first pilot signal is equal to or better than a predetermined level.
3 Assignments
0 Petitions
Accused Products
Abstract
It is possible to provide a radio communication system, a radio base station device, and a radio terminal device capable of reducing the power consumption in a radio terminal device without thinning pilot signals used for measuring upstream line quality. In the radio base station device (100) used in a radio communication system using different frequency bands for the upstream line and the downstream line, an upstream line pilot generation unit (115) forms a CQI measuring pilot signal and an upstream line RF unit (105) transmits the communication quality measuring pilot signal by using the upstream line use frequency band in the upstream line pilot transmission section. Thus, the upstream communication quality measuring pilot signal used by the radio base station device (100) to measure the line quality is transmitted by using the upstream line frequency band and accordingly, it is possible to reduce the power consumption in the radio terminal device.
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Citations
12 Claims
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1. A radio base station apparatus in a radio communication system in which different frequency bands are used between uplink where a signal is transmitted from a radio terminal apparatus to the radio base station apparatus and downlink where a signal is transmitted from the radio base status apparatus to the radio terminal apparatus, the apparatus comprising:
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a pilot forming section that forms a first pilot signal, which is a signal for measuring communication quality of the uplink at the radio terminal apparatus; and a transmission section that transmits the first pilot signal in the downlink in a transmission period for the first pilot signal, using a frequency band used for the uplink; and a communication quality measurement section that measures communication quality of the uplink based on a second pilot signal transmitted from the radio terminal apparatus in a band in which the communication quality measured at the radio terminal apparatus based on the first pilot signal is equal to or better than a predetermined level. - View Dependent Claims (2, 3, 4, 5)
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6. A radio base station apparatus in a radio communication system in which different frequency bands are used between uplink where a signal is transmitted from a radio terminal apparatus to the radio base station apparatus and downlink where a signal is transmitted from the radio base station apparatus to the radio terminal apparatus, the radio base station apparatus comprising:
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a pilot forming section that forms an first pilot signal, which is a signal for measuring communication quality of the uplink at the radio terminal apparatus; a transmission section that transmits the first pilot signal in the downlink in a transmission period for the first pilot signal, using a frequency band used for the uplink; and a band allocation section that allocates an uplink band to the radio terminal apparatus in response to a request from the radio terminal apparatus, wherein the transmission section transmits the first pilot signal when a bandwidth of an uplink band the radio terminal apparatus requests to allocate is equal to or greater than a predetermined bandwidth or when a delay spread of the ratio terminal apparatus is equal to or smaller than a predetermined value. - View Dependent Claims (7, 8)
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9. A radio terminal apparatus in a radio communication system in which different frequency bands are used between uplink where a signal is transmitted from a radio terminal apparatus to the radio base station apparatus and downlink where a signal is transmitted from the radio base station to the radio terminal apparatus, the radio terminal apparatus comprising:
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a receiving section that receives a first pilot signal, which is a signal for measuring communication quality of the uplink and which is transmitted from the radio base station apparatus in the downlink in a transmission period for the first pilot signal using a frequency band used for the uplink; a quality measurement section that measures communication quality of the uplink based on the first pilot signal; a pilot forming section that forms a second pilot signal; and a transmission section that transmits the second uplink pilot signal in a band, in which the communication quality measured at the quality measurement section based on the first pilot signal is equal or better than a predetermined level. - View Dependent Claims (10, 11)
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12. A radio terminal apparatus in a radio communication system in which different frequency bands are used between uplink where a signal is transmitted from a radio terminal apparatus to the radio base station apparatus and downlink where a signal is transmitted from the radio base station apparatus to the radio terminal apparatus, the radio terminal apparatus comprising:
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a receiving section that receives an first pilot signal, which is a signal for measuring communication quality of the uplink and which is transmitted from the radio base station apparatus in the downlink in a transmission period for the first pilot signal using a frequency band used for the uplink; a quality measurement section that measures communication quality of the uplink based on the first pilot signal; an uplink pilot forming section that forms a second pilot signal; and a transmitting section that transmits the second pilot signal when a bandwidth of an uplink band the radio terminal apparatus request to allocate is less than a predetermined bandwidth or when a delay spread of the radio terminal apparatus is greater than a predetermined value.
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Specification