Radio communication apparatus and method, controlling apparatus, mobile communication system

• US 8,670,793 B2
• Filed: 12/31/2009
• Issued: 03/11/2014
• Est. Priority Date: 01/08/2009
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Umeda, Masataka
• Primary Examiner(s): Rego, Dominic E
• Application Number:
  US12/651,016
• Publication Number:
  US 20100173663A1
• Time in Patent Office: 1,531 Days
• Field of Search: 455/522, 455/67.11, 455 68- 70, 455/115.3, 455/126, 455/127.1, 455/177.1, 455/200.1, 455/266, 455/23, 455/42, 455/113, 370/318
• 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 comprising:

a receiver configured to receive an uplink signal in a first radio frequency band assigned for an uplink to the radio communication apparatus; and

a controller configured to;

control transmission power of a mobile terminal communicating with the radio communication apparatus in accordance with information about a receiving condition of a signal in the first radio frequency band, the receiving condition being detected by another radio communication apparatus transmitting and receiving a signal in a second radio frequency band different from the first radio frequency band, and

control, based on a receiving condition of an uplink signal of the mobile terminal after control of the transmission power, at least one of a modulation scheme, a coding rate and an interval when the same radio frequency band is reused.

2. The radio communication apparatus according to claim 1,

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

3. The radio communication apparatus according to claim 1, wherein

the controller is configured to control a downlink to the mobile terminal in accordance with the information about the receiving condition of the signal in the first radio frequency band.

4. The radio communication apparatus according to claim 3, wherein

the controller controls the downlink in accordance with information for controlling the transmission power from a controlling apparatus that provides the information for controlling the transmission power based on the information about the receiving condition notified from the another radio communication apparatus.

5. The radio communication apparatus according to claim 1,

wherein the controller is configured to predict a receiving condition of an uplink signal of the mobile terminal after control of the transmission power.

6. The radio communication apparatus according to claim 1, wherein

the controller controls the transmission power in accordance with information for controlling the transmission power from a controlling apparatus that provides the information for controlling the transmission power based on the information about the receiving condition notified from the another radio communication apparatus.

7. A controlling apparatus comprising:

a receiver configured to receive, from a second radio communication apparatus that transmits and receives a signal in a second radio frequency band different from a first radio frequency band assigned for an uplink to a first radio communication apparatus, information about a receiving condition of a signal in the first radio frequency band, the receiving condition being detected by the second radio communication apparatus; and

a controller configured to;

control transmission power of a mobile terminal communicating with the first radio communication apparatus in accordance with the information about the receiving condition, and

control, based on a receiving condition of an uplink signal of the mobile terminal after control of the transmission power, at least one of a modulation scheme, a coding rate and an interval when the same radio frequency band is reused.

8. The controlling apparatus according to claim 7, further comprising:

a transmitter configured to transmit information for controlling the transmission power based on the information about the receiving condition of the signal in the first radio frequency band, to the first radio communication apparatus that controls the transmission power in accordance with the transmitted information.

9. The controlling apparatus according to claim 7, wherein

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

10. The controlling apparatus according to claim 7, wherein

the controlling apparatus is provided in a third radio communication apparatus.

11. A mobile communication system comprising:

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

a first radio communication apparatus configured to receive the uplink signal in the first radio frequency band;

a second radio communication apparatus configured to transmit and receive a signal in a second radio frequency band different from the first radio frequency band, and detect a receiving condition of a signal in the first radio frequency band, wherein

the first radio communication apparatus is configured to;

control transmission power of the mobile terminal in accordance with information about the receiving condition, and

control, based on a receiving condition of an uplink signal of the mobile terminal after control of the transmission power, at least one of a modulation scheme, a coding rate and an interval when the same radio frequency band is reused.

12. The mobile communication system according to claim 11, further comprising:

a controlling apparatus configured to provide information for controlling the transmission power based on the information about the receiving condition notified from the second radio communication, and wherein

the first radio communication apparatus controls the transmission power in accordance with the information provided by the controlling apparatus.

13. The mobile communication system according to claim 11, wherein

the first radio communication apparatus predicts the receiving condition of the uplink signal of the mobile terminal after control of the transmission power and, based on the prediction, decides at least one of the modulation scheme, the coding rate and the interval when the same radio frequency band is reused.

14. The mobile communication system according to claim 11, further comprising:

a controlling apparatus configured to control the transmission power based on the information about the receiving condition notified from the second radio communication apparatus and control, based on a receiving condition of an uplink signal of the mobile terminal after control of the transmission power, at least one of a modulation scheme, a coding rate and an interval when the same radio frequency band is reused.

15. The mobile communication system according to claim 14, wherein

the controlling apparatus predicts a receiving condition of the uplink signal of the mobile terminal after control of the transmission power and, based on the prediction, decides at least one of the modulation scheme, the coding rate and the interval when the same radio frequency band is reused.

16. The mobile communication system according to claim 14, wherein

the controlling apparatus is provided in a third radio communication apparatus.

17. The mobile communication system according to claim 11, wherein

the first radio communication apparatus is configured to control a downlink to the mobile terminal in accordance with the information about the receiving condition of the signal in the first radio frequency band.

18. The mobile communication system according to claim 17, further comprising:

a controlling apparatus configured to provide information for controlling the transmission power based on the information about the receiving condition notified from the second radio communication apparatus, and wherein

the first radio communication apparatus controls the downlink in accordance with the information provided by the controlling apparatus.

19. A radio communication method comprising:

assigning a first radio frequency band to a mobile terminal;

transmitting an uplink signal in the first radio frequency band from the mobile terminal to a first radio communication apparatus;

detecting a receiving condition of a signal in the first radio frequency band by a second radio communication apparatus transmitting and receiving a signal in a second radio frequency band different from the first radio frequency band;

controlling transmission power of the mobile terminal in accordance with information about the receiving condition, and, based on a receiving condition of an uplink signal of the mobile terminal after control of the transmission power, at least one of a modulation scheme, a coding rate and an interval when the same radio frequency band is reused.

20. The radio communication method according to claim 19, wherein

the controlling includes predicting the receiving condition of the uplink signal of the mobile terminal after control of the transmission power and, based on the prediction, deciding at least one of the modulation scheme, the coding rate and the interval when the same radio frequency band is reused.

21. The radio communication method according to claim 19, further comprising:

controlling a downlink to the mobile terminal of the first radio communication apparatus in accordance with the information about the receiving condition of the signal in the first radio frequency band.

22. A mobile terminal comprising:

a transmitter configured to transmit an uplink signal in a first radio frequency band to a first radio communication apparatus; and

a controller configured to;

control transmission power in accordance with controlling the transmission power by the first radio communication apparatus in accordance with information about a receiving condition of a signal in the first radio frequency band, the receiving condition being detected by another radio communication apparatus transmitting and receiving a signal in a second radio frequency band different from the first radio frequency band, and

perform communication with the first radio communication apparatus in accordance with at least one of a modulation scheme, a coding rate and an interval when the same radio frequency band is reused, controlled by the first radio communication apparatus based on a receiving condition of an uplink signal of the mobile terminal after control of the transmission power.