Abstract: A layout method for a scalable multi-die network-on-chip FPGA architecture is provided. An application of the aforementioned layout method for the scalable multi-die network-on-chip FPGA architecture is further provided. A scalable multi-die FPGA architecture based on network-on-chip and a corresponding hierarchical recursive layout algorithm are provided, aiming to directly map a register transfer level dataflow design generated by existing high-level synthesis onto the provided interconnection architecture. The layout method can exploit the potential for hierarchical topology and make more efficient use of dedicated interconnection resources, such as cross-die nets, network-on-chips, and high-speed transceivers.

Abstract: Embodiments provide a CSI-RS sending method and device, and a base station. The CSI-RS sending method includes: receiving capability indication information of each user equipment UE in a cell; determining N transmission schemes based on the capability indication information; configuring CSI-RS resources to be multiplexed by CSI-RSs corresponding to the N transmission schemes; and sending, to corresponding UE based on each of the N transmission schemes, a CSI-RS that is carried on the CSI-RS resource and that corresponds to the corresponding transmission scheme. It can be learned that according to the technical solutions in the embodiments of this application, when resources are limited, CSI-RSs corresponding to different transmission schemes are sent in a resource multiplexing manner, so that a plurality of transmission schemes can be compatible, and resource utilization can be improved.

Abstract: Embodiments provide a CSI-RS sending method and device, and a base station. The CSI-RS sending method includes: receiving capability indication information of each user equipment UE in a cell; determining N transmission schemes based on the capability indication information; configuring CSI-RS resources to be multiplexed by CSI-RSs corresponding to the N transmission schemes; and sending, to corresponding UE based on each of the N transmission schemes, a CSI-RS that is carried on the CSI-RS resource and that corresponds to the corresponding transmission scheme. It can be learned that according to the technical solutions in the embodiments of this application, when resources are limited, CSI-RSs corresponding to different transmission schemes are sent in a resource multiplexing manner, so that a plurality of transmission schemes can be compatible, and resource utilization can be improved.

Abstract: Embodiments of the present disclosure relate to the communications field, and in particular, to frequency synchronization of base stations. In an example frequency synchronization method, a first base station obtains a second frequency offset of a second base station. The first base station then determines a frequency difference between the first base station and the second base station and a first frequency offset of the first base station based on the second frequency offset and the frequency difference. The first base station then performs frequency synchronization based on the first frequency offset. In some instances, the first base station can determine, through interaction between the first base station and the second base station, the first frequency offset of the first base station without depending on a synchronous Ethernet to perform frequency synchronization.