RADIO BASE STATION DEVICE, RADIO TERMINAL DEVICE, AND RADIO COMMUNICATION SYSTEM

• US 20100041413A1
• Filed: 12/25/2007
• Published: 02/18/2010
• Est. Priority Date: 12/26/2006
• Status: Active Grant

• Current Assignee: Sovereign Peak Ventures, LLC (Dominion Harbor Enterprises, LLC)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Hiramatsu, Katsuhiko, Ogawa, Yoshihiko, Horiuchi, Ayako, Imamura, Daichi, Okamura, Shutai, Orihashi, Masayuki, Sumasu, Atsushi
• Granted Patent: US 8,559,965 B2
• Time in Patent Office: Days
• US Class Current: 455/452.200
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/1893 Physical mapping arrangements physical resource mapping in general H04L5/00
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/143 for modulated signals H04L5/1469 takes precedence
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: Y02D 30/70 in wireless communication networks

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.

Claims

1. A radio base station apparatus in a radio communication system in which different frequency bands are used between uplink and downlink, the apparatus comprising:

an uplink pilot forming section that forms an uplink pilot signal for communication quality measurement; and

a transmission section that transmits the uplink pilot signal for communication quality measurement in a transmission period for the uplink pilot signal for communication quality measurement, using an uplink frequency band for use.

2. The radio base station apparatus according to claim 1, wherein the transmission section transmits the uplink pilot signal for communication quality measurement in synchronization with another radio base station apparatus in the radio communication system.

3. The radio base station apparatus according to claim 1, further comprising:

a communication quality information acquisition section that acquires communication quality information measured at a receiving end based on the uplink pilot signal for communication quality measurement; and

an uplink communication quality measurement section that measures uplink communication quality only for an uplink pilot signal for communication quality measurement transmitted from the receiving end in a band in which the communication quality information shows equal or better communication quality than a predetermined level.

4. The radio base station apparatus according to claim 1, wherein:

the radio base station apparatus has a plurality of divided frequency bands for use divided in a frequency domain in the uplink frequency band for use; and

the transmission section transmits the uplink pilot signal for communication quality measurement in synchronization with all of the plurality of divided frequency bands for use.

5. The radio base station apparatus according to claim 1, further comprising an information signal generation section that generates an information signal,

wherein the transmission section transmits the information signal together with the uplink pilot signal for communication quality measurement in the transmission period.

6. The radio base station apparatus according to claim 1, further comprising a band allocation section that allocates an uplink band to a radio terminal apparatus in response to a band allocation request from the radio terminal apparatus,

wherein the transmission section transmits the uplink pilot signal for communication quality measurement only when a band the radio terminal apparatus requests to allocate has equal to or better than a predetermined bandwidth.

7. The radio base station apparatus according to claim 1, wherein, when the band the radio terminal apparatus requests to allocate has less than the predetermined bandwidth, the band allocation section allocates the transmission period as a period in which the radio terminal apparatus transmits the uplink pilot signal for communication quality measurement.

8. The radio base station apparatus according to claim 1, further comprising an acquisition section that acquires information showing channel quality fluctuation per frequency unit,

wherein the transmission section that transmits the uplink pilot signal for communication quality measurement only when frequency selectivity is high as the channel quality fluctuates strongly.

9. The radio base station apparatus according to claim 8, wherein, when the frequency selectivity is low as the channel quality per frequency unit fluctuates gently, the band allocation section allocates the transmission period as a period in which the radio terminal apparatus transmits the uplink pilot signal for communication quality measurement.

10. A radio terminal apparatus in a radio communication system in which different frequency bands are used between uplink and downlink, the apparatus comprising:

a receiving section that receives an uplink pilot signal for communication quality measurement transmitted from a radio base station apparatus in a transmission period for the uplink pilot signal for communication quality measurement using an uplink frequency band for use;

an uplink quality measurement section that measures uplink communication quality based on the uplink pilot signal for communication quality measurement; and

a reporting section that reports the measured communication quality information to a radio base station apparatus.

11. A radio terminal apparatus according to claim 10, further comprising an uplink pilot forming section that forms an uplink pilot signal for communication quality measurement;

and

a transmission section that transmits the uplink pilot signal for communication quality measurement only in a band in which the communication quality information shows equal or better communication quality than a predetermined level.

12. The radio terminal apparatus according to claim 10, wherein the reporting section reports a band in which uplink communication quality is equal to or better than a predetermined level as the communication quality information, to the radio base station mobile station apparatus by transmitting a random access channel signal in the band.

13. The radio terminal apparatus according to claim 10, further comprising an uplink pilot forming section that forms an uplink pilot signal for communication quality measurement;

and

a transmitting section that transmits the uplink pilot signal for communication quality measurement only when a requested bandwidth according to a band allocation request for the radio base station apparatus is less than a predetermined value.

14. The radio terminal apparatus according to claim 10, further comprising:

an uplink pilot signal forming section that forms an uplink pilot signal for communication quality measurement;

a measurement section that measures channel quality fluctuation per frequency unit; and

a transmission section that transmits the uplink pilot signal for communication quality measurement only when frequency selectivity is high as the channel quality fluctuates strongly.

15. A radio communication system in which different frequency bands are used between uplink and downlink, the system comprising:

a radio base station apparatus that comprises;

a pilot signal forming section that forms an uplink pilot signal for communication quality measurement;

a transmission section that transmits the uplink pilot signal for communication quality measurement in a transmission period for the uplink pilot signal for communication quality measurement, using an uplink frequency band for use; and

a scheduling section that performs scheduling based on communication quality information measured at a receiving end using the uplink pilot signal for communication quality measurement; and

a radio terminal apparatus that comprises;

a receiving section that receives the uplink pilot signal for communication quality measurement;

an uplink quality measurement section that measures uplink communication quality based on the uplink pilot signal for communication quality measurement; and

a reporting section that reports the measured communication quality information to a radio base station apparatus.