RADIO BASE STATION APPARATUS, MOBILE TERMINAL APPARATUS AND RADIO COMMUNICATION METHOD

• US 20120218962A1
• Filed: 10/05/2010
• Published: 08/30/2012
• Est. Priority Date: 10/05/2009
• Status: Active Grant

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Kishiyama, Yoshihisa, Takeda, Kazuaki, Taoka, Hidekazu
• Granted Patent: US 9,276,651 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04B 7/0645 Variable feedback
• CPC Class Codes: H04J 11/003 at the transmitter transmission to multiple receive units in multiple input multiple output [MIMO] H04B7/0452; transmit antenna weighting H04B7/0615
• CPC Class Codes: H04L 1/003 Adaptive formatting arrangements particular to signalling, e.g. variable amount of bits

Abstract

To use CSI feedback information capable of sufficiently supporting MU-MIMO transmission and CoMP transmission in LTE-A systems, in a radio communication method of the invention, a radio base station apparatus (200) generates downlink transmission data including a report mode corresponding to a bandwidth to perform feedback of feedback information including channel quality information and spatial channel information, and an extension level of the feedback information, and multiplexes the downlink transmission data and a reference signal for feedback information to transmit to a mobile terminal apparatus (100), and the mobile terminal apparatus (100) receives a downlink signal including the report mode and the extension level, and generates feedback information associated with the report mode and the extension level to transmit to the radio base station apparatus (200).

Claims

1. A radio base station apparatus comprising:

a downlink transmission data generating section configured to generate downlink transmission data including a report mode corresponding to a bandwidth to perform feedback of feedback information including channel quality information and spatial channel information, and an extension level of the feedback information; and

a multiplexing section configured to multiplex the downlink transmission data and a reference signal for feedback information.

2. The radio base station apparatus according to claim 1, wherein the extension level is changed corresponding to an information amount of spatial channel information for multi-user MIMO transmission.

3. The radio base station apparatus according to claim 1, wherein the extension level is changed corresponding to a form of CoMP transmission.

4. The radio base station apparatus according to claim 1, wherein the downlink transmission data generating section generates downlink transmission data by adaptive modulation/demodulation and coding processing based on the channel quality information included in the feedback information.

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

a transmission weight generating section configured to generate transmission weights based on the spatial channel information included in the feedback information.

6. The radio base station apparatus according to claim 1, wherein feedback information of a higher extension level includes feedback information of a lower extension level.

7. A mobile terminal apparatus comprising:

a reception section configured to receive a downlink signal including a report mode corresponding to a bandwidth to perform feedback of feedback information including channel quality information and spatial channel information, and an extension level of the feedback information; and

a feedback information generating section configured to generate feedback information associated with the report mode and the extension level.

8. The mobile terminal apparatus according to claim 7, wherein the extension level is changed corresponding to an information amount of spatial channel information for multi-user MIMO transmission.

9. The mobile terminal apparatus according to claim 7, wherein the extension level is changed corresponding to a form of CoMP transmission.

10. The mobile terminal apparatus according to claim 7, wherein feedback information of a higher extension level includes feedback information of a lower extension level.

11. A radio communication method comprising:

in a radio base station apparatus,

generating downlink transmission data including a report mode corresponding to a bandwidth to perform feedback of feedback information including channel quality information and spatial channel information, and an extension level of the feedback information;

multiplexing the downlink transmission data and a reference signal for feedback information to transmit to a mobile terminal apparatus;

in the mobile terminal apparatus,

receiving a downlink signal including the report mode and the extension level; and

generating feedback information associated with the report mode and the extension level to transmit to the radio base station apparatus.

12. The radio communication method according to claim 11, wherein the extension level is changed corresponding to an information amount of spatial channel information for multi-user MIMO transmission.

13. The radio communication method according to claim 11, wherein the extension level is changed corresponding to a form of CoMP transmission.

14. The radio communication method according to claim 11, wherein feedback information of a higher extension level includes feedback information of a lower extension level.