RADIO COMMUNICATION SYSTEM, RADIO BASE STATION APPARATUS, USER TERMINAL AND RADIO COMMUNICATION METHOD

• US 20140226519A1
• Filed: 10/01/2012
• Published: 08/14/2014
• Est. Priority Date: 10/14/2011
• Status: Active Grant

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Nagata, Satoshi, Abe, Tetsushi, Kishiyama, Yoshihisa
• Granted Patent: US 9,369,897 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• 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 7/0632 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: H04J 11/0053 using co-ordinated multipoint transmission/reception co-ordinated antenna or beam-forming aspects H04B7/022
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 72/54 based on quality criteria

Abstract

The present invention is designed to enable a radio base station apparatus to adequately estimate a coordinated cell to cause interference upon CoMP transmission, and effectively execute CoMP transmission. A radio communication system, according to the present invention, includes a plurality of radio base station apparatuses, and a user terminal (UE) that is configured to be able to perform coordinated multiple point transmission/reception with the plurality of radio base station apparatuses, where the user terminal (UE) has a transmission section that transmits information to use to estimate a candidate cell to be an interference cell upon coordinated multiple point transmission, and the radio base station apparatus has an estimation section that estimates a candidate cell to be an interference cell upon coordinated multiple point transmission based on the information.

Claims

1. A radio communication system comprising a plurality of radio base station apparatuses and a user terminal that is configured to be able to perform coordinated multiple point transmission/reception with the plurality of radio base station apparatuses, wherein:

the user terminal comprises a transmission section that transmits information to use to estimate a candidate cell to be an interference cell upon coordinated multiple point transmission; and

the radio base station apparatus comprises an estimation section that estimates the candidate cell to be the interference cell upon coordinated multiple point transmission, based on the information.

2. The radio communication system according to claim 1, wherein the information is shared data channel non-transmission candidate cell information.

3. The radio communication system according to claim 2, wherein the user terminal transmits the shared data channel non-transmission candidate cell information to the radio base station apparatus by higher layer signaling, using a measurement report.

4. The radio communication system according to claim 2, wherein the user terminal dynamically transmits the shared data channel non-transmission candidate cell information to the radio base station apparatus, using feedback of channel quality information.

5. The radio communication system according to claim 1, wherein the information is a measurement report result.

6. The radio communication system according to claim 5, wherein the radio base station apparatus estimates a shared data channel non-transmission candidate cell using the measurement report result.

7. The radio communication system according to claim 6, wherein the radio base station apparatus transmits information about the shared data channel non-transmission candidate cell to the user terminal by higher layer signaling.

8. The radio communication system according to claim 6, wherein the radio base station apparatus transmits information about the shared data channel non-transmission candidate cell to the user terminal by dynamic signaling using a downlink control channel.

9. A radio base station apparatus in a radio communication system comprising a plurality of radio base station apparatuses and a user terminal that is configured to be able to perform coordinated multiple point transmission/reception with the plurality of radio base station apparatuses,

wherein the radio base station apparatus comprises an estimation section that estimates a candidate cell to be an interference cell upon coordinated multiple point transmission, based on information transmitted from the user terminal.

10. A user terminal in a radio communication system comprising a plurality of radio base station apparatuses and a user terminal that is configured to be able to perform coordinated multiple point transmission/reception with the plurality of radio base station apparatuses,

wherein the user terminal comprises a transmission section that transmits information to use to estimate a candidate cell to be an interference cell upon coordinated multiple point transmission.

11. A radio communication method in a radio communication system comprising a plurality of radio base station apparatuses and a user terminal that is configured to be able to perform coordinated multiple point transmission/reception with the plurality of radio base station apparatuses, the radio communication method comprising the steps of:

at the user terminal, transmitting information to use to estimate a candidate cell to be an interference cell upon coordinated multiple point transmission; and

at the radio base station apparatus, estimating the candidate cell to be the interference cell upon coordinated multiple point transmission based on the information.