Wireless communication system, wireless communication device, and wireless communication method

Patent metadata

Field	Value
Publication number	US-9350478-B2
Application number	US-201013265269-A
Country	US
Kind code	B2
Filing date	Apr 26, 2010
Priority date	Apr 24, 2009
Publication date	May 24, 2016
Grant date	May 24, 2016

Abstract

A wireless communication system includes a first channel state measurer and a second channel state measurer. When a second communication device measures a state of a channel between the second communication device and a first communication device using reference signals transmitted from the first communication device, the first channel measurer is configured to measure a state of the channel including an interference due to a signal transmitted from another first communication device. When measuring the state of the channel between the second communication device and the first communication device using the reference signals transmitted from the first communication device, the second channel state measurer measures the state of the channel while suppressing the interference due to the signal transmitted from the another first communication device. Accordingly, the wireless communication system can generate adequate feedback information both when cooperative communication is performed and when cooperative communication is not performed.

First claim

The invention claimed is:

1. A wireless communication system comprising:
a base station device; and
a mobile station device configured to communicate with the base station device,
wherein the base station device comprises:
a pilot signal generator configured to generate a pilot signal; and
a radio transmitter configured to transmit to the mobile station device, the pilot signal generated by the pilot signal generator,
the mobile station device comprises:
a measurer configured to measure, using the pilot signal transmitted from the base station device, a state of a channel between the mobile station device and the base station device; and
a feedback information generator configured to generate feedback information based on a result of measurement performed by the measurer,
the mobile station device is configured to selectively measure, using control information reported from the base station device, any one of a state of the channel including an interference due to a signal transmitted from another base station device, and a state of the channel including the interference that is reduced, and to selectively generate the feedback information, wherein
the feedback information comprises information indicating an encoding rate and a modulation scheme which are to be recommended to the base station device, and
the base station device is configured to share, with the other base station device through a network, information related to an interference with the other base station device.

2. The wireless communication system according to claim 1 , wherein the control information comprises information indicating whether or not to order the mobile station device to generate the feedback information in order for the base station device to cooperatively communicate with the other base station device.

3. The wireless communication system according to claim 1 , wherein the pilot signal generator is configured to generate the pilot signal based on an orthogonal code sequence.

4. The wireless communication system according to claim 1 , wherein the base station device is configured to report a control signal to the mobile station device through an RRC signaling that is a higher layer signal.

5. A mobile station device configured to communicate with a base station device, the mobile station device comprising:
a measurer configured to measure, using a pilot signal transmitted from the base station device, a state of a channel between the mobile station device and the base station device; and
a feedback information generator configured to generate feedback information based on a result of measurement performed by the measurer,
wherein the mobile station device is configured to selectively measure, using control information reported from the base station device, any one of a state of the channel including an interference due to a signal transmitted from another base station device, and a state of the channel including the interference that is reduced, and to selectively generate the feedback information, wherein
the feedback information comprises information indicating an encoding rate and a modulation scheme which are to be recommended to the base station device, and
information related to an interference with the other base station device is shared between the base station device and the other base station device through a network.

6. A base station device configured to communicate with a mobile station device capable of measuring one of a state of a channel including an interference due to a signal transmitted from another base station device, and a state of the channel including the interference that is reduced, the base station device comprising:
a pilot signal generator configured to generate a pilot signal; and
a radio transmitter configured to transmit to the mobile station device, the pilot signal generated by the pilot signal generator,
wherein the base station device is configured to report, to the mobile station device, control information for the mobile station device to selectively measure any one of the states of the channel by using the pilot signal, and to selectively generate the feedback information, wherein
the feedback information comprises information indicating an encoding rate and a modulation scheme, and
the base station device is configured to share, with the other base station device through a network, information related to an interference with the other base station device.

7. The base station device according to claim 6 , wherein the control information comprises information indicating whether or not to order the mobile station device to generate the feedback information in order for the base station device to cooperatively communication with the other base station device.

8. The base station device according to claim 6 , wherein the pilot signal generator is configured to generate the pilot signal based on an orthogonal code sequence.

9. The base station device according to claim 6 , wherein the base station device is configured to transmit a control signal to the mobile station device through an RRC signaling that is a higher layer signal.

10. A communication method for a mobile station device configured to communicate with a base station device, the communication method comprising:
measuring, using a pilot signal transmitted from the base station device, a state of a channel between the mobile station device and the base station device;
generating feedback information based on a result of measurement performed by the measurer; and
selectively measuring, using control information reported from the base station device, any one of a state of the channel including an interference due to a signal transmitted from another base station device, and a state of the channel including the interference that is reduced, and selectively generating the feedback information, wherein
the feedback information comprises information indicating an encoding rate and a modulation scheme which are to be recommended to the base station device, and
information related to an interference with the other base station device is shared between the base station device and the other base station device through a network.

11. A communication method for a base station device configured to communicate with a mobile station device capable of measuring one of a state of a channel including an interference due to a signal transmitted from another base station device, and a state of the channel including the interference that is reduced, the communication method comprising:
sharing with the other base station device through a network, information related to an interference with the other base station device;
generating a pilot signal;
transmitting the pilot signal generated to the mobile station device; and
reporting to the mobile station device, control information for the mobile station device to selectively measure any one of the states of the channel by using the pilot signal, and to selectively generate the feedback information, wherein
the feedback information comprises information indicating an encoding rate and a modulation scheme.

12. The communication method according to claim 11 , wherein the control information comprises information indicating whether or not to order the mobile station device to generate the feedback information in order for the base station device to cooperatively communicate with the other base station device.

13. The communication method according to claim 11 , wherein the pilot signal is generated based on an orthogonal code sequence.

14. The communication method according to claim 11 , wherein the contr

Assignees

• Shimezawa Kazuyuki
• Nogami Toshizo
• Yamada Shohei
• Sharp Kk

Inventors

• Shimezawa Kazuyuki
• Nogami Toshizo
• Yamada Shohei

Classifications

• H04W72/541

  using the level of interference · CPC title

• H04L2025/03426

  transmission using multiple-input and multiple-output channels · CPC title

• H04L2025/03808

  Transmission of equaliser coefficients · CPC title

• H04L25/0234

  by non-linear interpolation · CPC title

• H04B7/068

  using space frequency diversity (space-frequency coding H04L1/0606) · CPC title