WIRELESS COMMUNICATION APPARATUS AND WIRELESS COMMUNICATION METHOD

• US 20120076040A1
• Filed: 04/27/2010
• Published: 03/29/2012
• Est. Priority Date: 06/02/2009
• Status: Active Grant

• Current Assignee: Sun Patent Trust
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Hoshino, Masayuki, Nishio, Akihiko, Nakao, Seigo, Imamura, Daichi, Yuda, Yasuaki
• Granted Patent: US 8,588,102 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 17/0085 using test signal generators
• CPC Class Codes: H04B 17/24 with feedback of measurements to the transmitter
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0027 Scheduling of signalling, e.g. occurrence thereof
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/1268 of uplink data flows
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

To suppress concentration of channel quality information requests and reports in a case of discontinuously transmitting reference signals at specific resources in a time domain, and thereby preventing degradation in throughput. A transmission apparatus (eNB) transmits an instruction of CSI request distributed for each reception apparatus in a subframe concurrently with or earlier than a reference signal CSI-RS to each of reception apparatuses (UE1, UE2). Each of the reception apparatuses (UE1, UE2) detects the CSI request from the transmission apparatus and calculates CSI from a channel estimation value of CSI-RS received thereafter. Then, the reception apparatus identifies CSI report subframe of the own apparatus from CSI report interval information of a given time interval notified in advance, the subframe in which the CSI request is detected and transmission timing of CSI-RS, and transmits a feedback signal including CSI report value by using PUSCH at the timing of the CSI report subframe.

Claims

1. A wireless communication apparatus, comprising:

a reference signal generator that is configured to generate a reference signal for allowing a reception apparatus serving as a communication party to calculate a channel quality of a transmission channel;

a channel quality information request setting section that is configured to set a transmission timing of a channel quality information request for causing channel quality information with respect to the reference signal to be fed back from the reception apparatus so that timings are set to be temporally distributed over the plurality of reception apparatuses simultaneously with or before a transmission timing of the reference signal to be discontinuously transmitted on the time axis;

a channel quality information report setting section that is configured to set a transmission timing of a channel quality information report to be transmitted from the reception apparatus in response to the channel quality information request so that a report interval is set to a given time interval as a time interval from transmission of the channel quality information request to transmission of the channel quality information report from the reception apparatus; and

a communication section that is configured to transmit the reference signal and the channel quality information request, and receive the channel quality information report.

2. The wireless communication apparatus according to claim 1, wherein

the channel quality information report setting section is configured to set the report interval to be a time interval obtained by adding a predetermined offset to a time interval necessary from reception of the reference signal to transmission of the channel quality information report in the reception apparatus.

3. The wireless communication apparatus according to claim 2, wherein

the channel quality information report setting section is configured to set the predetermined offset to be a value corresponding to the number of reception apparatuses under the wireless communication apparatus.

4. The wireless communication apparatus according to claim 1, wherein

the channel quality information report setting section is configured to set the report interval to be a time interval matched with a retransmission interval at the time of communication with the reception apparatus.

5. The wireless communication apparatus according to claim 1, comprising:

a report interval information notification section that is configured to notify the reception apparatus of report interval information which indicates the report interval.

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

the channel quality information report setting section is configured to instruct a timing, at which the channel quality information report is transmitted from the reception apparatus serving as the communication party, to the communication section, and

the communication section is configured to receive the channel quality information report at the indicated timing.

7. The wireless communication apparatus according to claim 1, comprising:

a resource allocation section that is configured to allocate resources regarding communication from the wireless communication apparatus to the reception apparatus and communication from the reception apparatus to the wireless communication apparatus on the basis of the transmission timing of the channel quality information request and the transmission timing of the channel quality information report.

11. A wireless communication base station apparatus, comprising the wireless communication apparatus according to claim 1.

8. A wireless communication apparatus, comprising:

a channel quality calculator that is configured to calculate a channel quality of a transmission channel on the basis of a reference signal discontinuously transmitted on the time axis received from a transmission apparatus serving as a communication party;

a feedback information generator that is configured, when one of channel quality information requests transmitted at timings temporally distributed over a plurality of reception apparatuses including the wireless communication apparatus is received from the transmission apparatus simultaneously with or before a transmission timing of the reference signal, to generate feedback information including a channel quality information report which indicates the calculated channel quality on the basis of a preset report interval which is a given time interval from transmission of the channel quality information request to transmission of the channel quality information report in response to the channel quality information request; and

a communication section that is configured to receive the reference signal and the channel quality information request, and transmit the channel quality information report.

9. The wireless communication apparatus according to claim 8, wherein

the feedback information generator is configured to generate the feedback information including the channel quality information report on the basis of a time interval, set as the report interval, obtained by adding a predetermined offset to a time interval necessary from reception of the reference signal to transmission of the channel quality information report.

10. The wireless communication apparatus according to claim 8, wherein

the feedback information generator is configured to generate the feedback information including the channel quality information report on the basis of a time interval, set as the report interval, matched with a retransmission interval at the time of communication with the transmission apparatus.

12. A wireless communication mobile station apparatus comprising the wireless communication apparatus according to claim 8.

13. A wireless communication method in a wireless communication apparatus, the wireless communication method comprising:

generating a reference signal for allowing a reception apparatus serving as a communication party to calculate a channel quality of a transmission channel;

when setting transmission timing of a channel quality information request for causing channel quality information with respect to the reference signal to be fed back from the reception apparatus, setting timings temporally distributed over a plurality of reception apparatuses simultaneously with or before transmission timing of the reference signal discontinuously transmitted on the time axis;

when setting transmission timing of a channel quality information report in response to the channel quality information request to be transmitted from the reception apparatus, setting a report interval to be a given time interval as a time interval from transmission of the channel quality information request to transmission of the channel quality information report from the reception apparatus; and

transmitting the reference signal and the channel quality information request, and receiving the channel quality information report.

14. A wireless communication method in a wireless communication apparatus, the wireless communication method comprising:

calculating a channel quality of a transmission channel on the basis of a reference signal discontinuously transmitted on the time axis received from a transmission apparatus serving as a communication party;

when one of channel quality information requests which are transmitted at timings temporally distributed over a plurality of reception apparatuses including the wireless communication apparatus is received from the transmission apparatus simultaneously with or before the transmission timing of the reference signal, generating feedback information including a channel quality information report which indicates the calculated channel quality on the basis of a preset report interval which is a given time interval from transmission of the channel quality information request to transmission of the channel quality information report in response to the channel quality information request; and

transmitting the channel quality information report.