Wireless communication terminal device, wireless communication base device, and method for generating CSI
The purpose of the present invention is to be able to simultaneously generate three or more sets of CSI within a predetermined time interval, without degrading the accuracy of the CSI, to achieve CoMP control for flexible switching of base stations. At predetermined intervals or at timing coincident with reception of trigger information, a generation unit uses a CSI-RS resource to measure a desired signal component and interference component, and generate CSI. A transmission unit transmits control information including the CSI. During a given interval (for example, during four sub-frames) following reception of trigger information, the generation unit does not measure the interference component, instead using the most recent previously measured interference component, to measure the channel quality.
1. A radio communication terminal apparatus comprising:
a generation section that generates CSI (Channel State Information) using a desired signal component and an interference component; and
a transmitting section that transmits the CSI, wherein
when receiving trigger information that requests a CSI report and generating the CSI, the generation section uses an interference component measured before receiving the trigger information; and
when receiving the trigger information and generating the CSI, the generation section uses a desired signal component measured after receiving the trigger information.
2. The radio communication terminal apparatus according to claim 1 , wherein the generation section measures the desired signal component and the interference component using a resource indicated by resource information, wherein the resource information indicates a resource to which a reference signal is mapped.
3. The radio communication terminal apparatus according to claim 2 , wherein when no resource exists for measuring a desired signal component of CSI to be reported in a subframe received at timing at which the trigger information is received, the generation section uses a desired signal component of CSI to be reported that is measured before receiving the trigger information.
4. The radio communication terminal apparatus according to claim 2 , wherein, when a resource used to measure a desired signal component of CSI and a resource used to measure an interference component of another CSI are the same, the generation section measures the desired signal component using the resource after receiving the trigger information and measures the interference component using the interference component measured using the resource before receiving the trigger information.
5. A radio communication base station apparatus comprising:
a transmitting section that transmits resource information indicating a resource to which a reference signal is mapped and trigger information requesting a CSI report; and
a receiving section that receives CSI (Channel State Information) generated based on a desired signal component and an interference component measured using the resource for the trigger information, wherein
the CSI is generated based on an interference component measured before transmitting the trigger information, and
the CSI is generated based on a desired signal component measured after transmitting the trigger information.
6. A CSI generating method comprising:
measuring a desired signal component and an interference component; and
generating CSI (Channel State Information) using the desired signal component and the interference component, wherein
when trigger information requesting a CSI report is received and the CSI is generated, an interference component measured before receiving the trigger information is used, and
when the trigger information is received and the CSI is generated, a desired signal component measured after receiving the trigger information is used.