Radio Communication Apparatus And Method, Controlling Apparatus, Mobile Communication System

• US 20100173663A1
• Filed: 12/31/2009
• Published: 07/08/2010
• Est. Priority Date: 01/08/2009
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: UMEDA, Masataka
• Granted Patent: US 8,670,793 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04W 52/223 predicting future states of the transmission
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters

Abstract

A radio communication apparatus, for use as a base station, includes a receiver configured to receive a signal in a predetermined radio frequency band transmitted from a terminal under control of another radio communication apparatus adjacent to the radio communication apparatus and detecting a receiving condition of the signal and a notifying unit configured to notify the receiving condition to an apparatus performing transmission power control of the signal in the predetermined radio frequency band transmitted from the terminal.

Claims

1. A radio communication apparatus for use as a base station, the radio communication apparatus comprising:

a receiver configured to receive a signal in a predetermined radio frequency band transmitted from a terminal under control of another radio communication apparatus adjacent to the radio communication apparatus and detecting a receiving condition of the signal; and

a notifying unit configured to notify the receiving condition to an apparatus performing transmission power control of the signal in the predetermined radio frequency band transmitted from the terminal.

2. The radio communication apparatus according to claim 1, further comprising a controller configured to control transmission power of the terminal based on information provided by the apparatus performing transmission power control of the signal in the predetermined radio frequency band transmitted from the terminal,

wherein the controller predicts a receiving condition of an uplink signal of the terminal after control of the transmission power of the terminal and, based on the prediction, decides a modulation scheme and a coding rate of the uplink signal of the terminal and an interval when the same radio frequency band is reused.

3. The radio communication apparatus according to claim 1, wherein the controller controls a downlink to the terminal based on the information provided by the apparatus performing transmission power control of the signal in the predetermined radio frequency band transmitted from the terminal.

4. A controlling apparatus for controlling a first base station that receives a signal in a first radio frequency band, and a second base station that transmits and receives a signal in a second radio frequency band different from the first radio frequency band, the controlling apparatus comprising:

a selecting unit configured to select a mobile station to which the first radio frequency band is assigned as a frequency band of an uplink signal;

a receiver configured to receive, from the second base station, information about a receiving condition when the second base station receives a signal in the first radio frequency band;

a controller configured to control an uplink of the mobile station based on the information received by the receiver; and

a transmitter configured to transmit information for controlling the uplink of the mobile station to the first base station.

5. The controlling apparatus according to claim 4, wherein the controller controls transmission power of the mobile station.

6. The controlling apparatus according to claim 5, wherein the controller predicts a receiving condition of an uplink signal of the mobile station after control of the transmission power of the mobile station and, based on the prediction, decides a modulation scheme and a coding rate of the uplink signal of the mobile station and an interval when the same radio frequency band is reused.

7. The controlling apparatus according to claim 4, wherein the selecting unit, the receiver, the controller and the transmitter are provided in a third base station.

8. A mobile communication system comprising:

a mobile station configured to transmit an uplink signal in a first radio frequency band;

a first base station configured to receive the uplink signal in the first radio frequency band;

a second base station configured to transmit and receive a signal in a second radio frequency band different from the first radio frequency band; and

a controlling apparatus configured to control the first base station and the second base station,

wherein the second base station notifies the controlling apparatus of a receiving condition of the signal in the first radio frequency band, and

wherein the first base station controls an uplink of the mobile station based on information provided by the controlling apparatus.

9. The mobile communication system according to claim 8, wherein the first base station controls transmission power of the mobile station based on the information provided by the controlling apparatus.

10. The mobile communication system according to claim 9, wherein the first base station predicts a receiving condition of an uplink signal of the mobile station after control of the transmission power of the mobile station and, based on the prediction, decides a modulation scheme and a coding rate of the uplink signal of the mobile station and an interval when the same radio frequency band is reused.

11. The mobile communication system according to claim 8, wherein the controlling apparatus controls the transmission power of the mobile station based on the notification from the second base station.

12. The mobile communication system according to claim 11, wherein the controlling apparatus predicts a receiving condition of an uplink signal of the mobile station after control of the transmission power of the mobile station and, based on the prediction, decides a modulation scheme and a coding rate of the uplink signal of the mobile station and an interval when the same radio frequency band is reused.

13. The mobile communication system according to claim 11, wherein the controlling apparatus is provided in a third base station.

14. The mobile communication system according to claim 8, wherein the first base station controls a downlink to the mobile terminal based on the information provided by the controlling apparatus.

15. A radio communication method comprising:

assigning a first radio frequency band to a mobile station;

transmitting an uplink signal in the first radio frequency band from the mobile station to a first base station;

receiving a signal in the first radio frequency band by a second base station transmitting and receiving a signal in a second radio frequency band different from the first radio frequency band; and

controlling an uplink of the mobile station based on a receiving condition of the signal in the first radio frequency band in the second base station.

16. The radio communication method according to claim 15, wherein the controlling the uplink of the mobile station includes controlling transmission power of the mobile station based on a receiving condition of an uplink signal in the first radio frequency band in the second base station.

17. The radio communication method according to claim 16, wherein the controlling the uplink of the mobile station includes predicting a receiving condition of the uplink signal of the mobile station after control of the transmission power of the mobile station and, based on the prediction, decides a modulation scheme and a coding rate of the uplink signal of the mobile station and an interval when the same radio frequency band is reused.

18. The radio communication method according to claim 15, further comprising controlling a downlink to the mobile station of the first base station based on a receiving condition of the uplink signal in the first radio frequency band in the second base station.

19. A radio communication apparatus for use as a mobile station, the radio communication apparatus comprising:

a transmitter configured to transmit an uplink signal in a first radio frequency band assigned for an uplink signal;

a receiver configured to receive information about a receiving condition when a base station transmitting and receive a signal in a second radio frequency band different from the first radio frequency band receives the signal in the first radio frequency band; and

a controller configured to control transmission power of the uplink signal based on the information received by the receiver.

20. The radio communication apparatus according to claim 19, wherein the controller controls a modulation scheme and a coding rate of the uplink signal based on the information received by the receiver.