Method and apparatus for performing cooperative communication in wireless communication system
摘要
說明書
The UE may determine the number of antenna ports used to transmit PDSCHs, based on Table indicating DMRS ports. In DCI Format 1_1, an antenna port indication method based on new radio (NR) NR Rel-15 specification is determined based on an index with a length of 4 to 6 bits indicated by an antenna port field in DCI. The UE may identify the number and index of DMRS ports for PDSCHs, the number of front-load symbols, and information about the number of CDM groups, based on an indicator (index) transmitted from the BS. Also, the UE may determine a dynamic change in a beamforming direction, based on information of a TCI field in DCI Format 1_1. When tci-PresentDCI is configured as ‘enabled’ in an upper layer, the UE may check the TCI field of 3-bit information and thus may determine a beam direction associated with activated TCI states and DL-RS on a DL BWP or scheduled component carrier. On the other hand, when tci-PresentDCI is disabled, the UE may determine that there is no change in a beam direction of beamforming.
In various embodiments of the disclosure, a scenario in which PDSCHs to be transmitted at least two different transmission points are allocated via one PDCCH is considered. A UE of NR Rel-15 specification may receive a PDSCH stream including one or more layers QCLed based on TCI information and antenna port information in one PDCCH. On the other hand, a UE of NR Rel-16 specification may receive data in a C-JT or NC-JT manner, the data being transmitted from multiple TRPs or a plurality of BSs. In order to support C-JT or NC-JT, the UE of NR Rel-16 specification requires basic upper layer configuration. In detail, the UE may receive C-JT/NC-JT related parameters or setting values via an upper layer and may perform configuration to support C-JT/NC-JT, based on the received parameters or setting value.
