Channel state information reporting method and apparatus
摘要
說(shuō)明書
The central base station may determine, based on the above three pieces of CSI fed back by the terminal device, which base station needs be used to transmit data to the terminal device or that all base stations need to be used to transmit data to the terminal device.
However, it is assumed that one central base station may make a CSI measurement decision and a data scheduling decision for all serving base stations in the above method. For example, in the above CSI report 3, it is assumed that the base station 1 and the base station 2 obey an instruction of the central base station, and simultaneously send the CSI-RS 1 and the CSI-RS 2, so that the terminal device performs interference measurement. It is also assumed that if an NCJT transmission mechanism is used for subsequent data transmission, the base station 1 and the base station 2 certainly transmit different data streams to the terminal device simultaneously. Because sending of a CSI-RS (especially sending of an aperiodic CSI-RS) is dynamically determined, data scheduling is also dynamically determined. In the above method, the central base station still needs to know CSI information of each serving base station, and coordinate the serving base stations to serve the terminal device. A specific scheduling delay is required, and dynamic information exchange cannot be avoided. This is contrary to an original intention of reducing a delay and avoiding dynamic information exchange.
