5GNRPMI码本设计方案。NRdefinestwotypesofCSIthatdifferinthestructureandsizeoftheprecodercodebooks,TypeICSIandTypeIICSI.•TypeICSIprimarilytargetsscenarioswhereasingleuserisscheduledwithinagiventime/frequencyresource(noMU-MIMO),potentiallywithtransmissionofarelativelylargenumberoflayersi