Channel state information reporting method and apparatus
摘要
說明書
Specifically, in a multi-TRP transmission network, the terminal device may receive downlink control information from a plurality of network devices (which may be specifically serving base stations), to trigger the terminal device to report CSI. To avoid dynamic information exchange, the CSI is measured through pre-scheduling in this embodiment of this application. The “pre-scheduling” means that a serving base station makes a semi-static agreement. To be specific, if each serving base station needs to schedule data for the terminal device at a moment t+k, the serving base station sends downlink control information at a moment t, to trigger an associated CSI report. There is a specific association relationship between CSI reports triggered by the serving base stations. The CSI report triggered by the downlink control information sent by each serving base station is associated with a CSI-RS resource and a CSI-IM resource group of the serving base station. The DCI of each base station triggers only the CSI, and the CSI-RS resource and the CSI-IM resource associated with the CSI, and does not need to trigger a CSI-RS resource of another base station (that is, it is not necessary to make a decision for the another base station or know a decision of the another base station). In this way, serving base stations do not need to know scheduling policies and CSI measurement decisions of each other, and a delay caused by information exchange is avoided. In this embodiment of this application, the first DCI indicates the first CSI configuration. The first CSI configuration is associated with at least two CSI-IM resources. There are two types of CSI-IM resources in the at least two CSI-IM resources. The two types of CSI-IM resources separately correspond to different transmission mechanisms, that is, are used to measure interference information in the different transmission mechanisms. Therefore, the terminal device may determine, based on a quantity (M) of pieces of received DCI, whether a data transmission mechanism in the future is multi-station joint transmission or single-station transmission, to select the target CSI-IM resource from the two types of CSI-IM resources, and obtain interference information by measuring the target CSI-IM resource. Further, the terminal device may measure a CSI-RS resource to perform channel measurement.
