Wireless communication terminal and communication method for measuring a channel quality indicator (CQI)

• US 9,392,480 B2
• Filed: 05/14/2010
• Issued: 07/12/2016
• Est. Priority Date: 05/15/2009
• Status: Active Grant

• Current Assignee: Sun Patent Trust
• Original Assignee: Sun Patent Trust
• Inventors: Yuda, Yasuaki, Nakao, Seigo, Horiuchi, Ayako, Imamura, Daichi, Hoshino, Masayuki, Sumasu, Atsushi
• Primary Examiner(s): Algahaim, Helal A
• Assistant Examiner(s): ISMAIL, MAHMOUD S
• Application Number:
  US13/266,634
• Publication Number:
  US 20120063343A1
• Time in Patent Office: 2,251 Days
• Field of Search: 370/210, 370/241, 370/346, 370/465, 370/328, 370/311, 370/252, 455/422.1, 375/260
• US Class Current: 1/1
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04L 12/189 in combination with wireless systems selective distribution or broadcast in wireless communication networks H04W4/06
• CPC Class Codes: H04L 27/28 with simultaneous transmission of different frequencies each representing one code element
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 84/047 using dedicated repeater stations

Abstract

To measure the channel quality of the own cell accurately in a condition where there is no interference from a neighbor cell. A wireless communication terminal according to the invention is a wireless communication terminal to be connected to a base station for transmitting and receiving data to/from the base station, the wireless communication terminal including: a receiver that receives a signal which includes control information provided for measuring a channel quality of own cell from the base station; an extractor that extracts the control information from the signal received by the receiver; a measurement section that measures, on the basis of the control information, the channel quality of the own cell in a domain where a neighbor cell does not transmit a signal; and a transmitter that transmits a measurement result of the channel quality of the own cell measured by the measurement section, to the base station.

Claims

1. A terminal apparatus that receives signals from a first cell to which the terminal apparatus belongs and from a second cell, the terminal apparatus comprising:

a radio receiver, which, in operation, receives information indicating subframes that include a subframe in which no downlink data is transmitted by the second cell, and receives a reference signal that is transmitted from the first cell to which the terminal apparatus belongs and that is transmitted on the subframe in which no downlink data is transmitted by the second cell; and

a Channel Quality Indicator (CQI) measurement circuit, which, in operation, measures CQI using the received reference signal that is transmitted on the subframe in which no downlink data is transmitted by the second cell,

wherein the CQI measurement circuit, in operation, measures the CQI for a subframe, in which the second cell causes no interference to the first cell to which the terminal apparatus belongs, based on said information.

2. The terminal apparatus according to claim 1, wherein the second cell is a neighbor cell to the first cell.

3. The terminal apparatus according to claim 1, wherein the second cell causes interference to the first cell to which the terminal apparatus belongs.

4. The terminal apparatus according to claim 1, wherein the subframe is a Multicast/Broadcast over Single Frequency Network (MBSFN) subframe.

5. The terminal apparatus according to claim 1, wherein the subframes indicated by said information are different depending on a cell.

6. The terminal apparatus according to claim 1, wherein the reference signal used to measure the CQI is mapped on or after the third symbol in a subframe of the first cell to which the terminal apparatus belongs.

7. The terminal apparatus according to claim 1, wherein the reference signal used to measure the CQI is mapped on the seventh symbol in a subframe of the first cell to which the terminal apparatus belongs.

8. A communication method performed by a terminal apparatus that receives signals from a first cell to which the terminal apparatus belongs and from a second cell, the method comprising:

receiving information indicating subframes that include a subframe in which no downlink data is transmitted by the second cell;

receiving a reference signal that is transmitted from the first cell to which the terminal apparatus belongs and that is transmitted on the subframe in which no downlink data is transmitted by the second cell; and

measuring Channel Quality Indicator (CQI) using the received reference signal that is transmitted on the subframe in which no downlink data is transmitted by the second cell,

wherein the measuring includes measuring of the CQI for a subframe, in which the second cell causes no interference to the first cell to which the terminal apparatus belongs, based on said information.

9. The communication method according to claim 8, wherein the second cell is a neighbor cell to the first cell.

10. The communication method according to claim 8, wherein the second cell causes interference to the first cell to which the terminal apparatus belongs.

11. The communication method according to claim 8, wherein the subframe is a Multicast/Broadcast over Single Frequency Network (MBSFN) subframe.

12. The communication method according to claim 8, wherein the subframes indicated by said information are different depending on a cell.

13. The communication method according to claim 8, wherein the reference signal used to measure the CQI is mapped on or after the third symbol in a subframe of the first cell to which the terminal apparatus belongs.

14. The communication method according to claim 8, wherein the reference signal used to measure the CQI is mapped on the seventh symbol in a subframe of the first cell to which the terminal apparatus belongs.