Method and apparatus for beam management for multi-stream transmission

Abstract

A method of a user equipment (UE) for a beam indication in a wireless communication system is provided. The method comprises receiving, from multiple transmission reception points (TRPs), downlink data transmissions, receiving downlink control information (DCI) that includes a beam indication configuration comprising a one bit-field that indicates multiple transmission configuration indicator (TCI) states, wherein each of the multiple TCI states indicates a quasi-colocation (QCL) configuration for downlink data channels received from the TRPs, determining indices of the multiple TCI states based on the received one bit-field included in the DCI, deriving an association between the multiple TCI states indicated by the one bit-field and a downlink data transmission of each of the TRPs, and receiving, the downlink data transmission from each of the TRPs with the QCL configuration indicated by the derived association.

What is claimed is: 
     
         1 . A user equipment (UE) for a beam indication in a wireless communication system, the UE comprising:
 a transceiver configured to:
 receive, from multiple transmission reception points (TRPs), downlink data transmissions; and 
 receive downlink control information (DCI) that includes a beam indication configuration comprising a one bit-field that indicates multiple transmission configuration indicator (TCI) states, wherein the multiple TCI states indicate a quasi-colocation (QCL) configuration for downlink data channels received from the TRPs; 
   a processor operably connected to the transceiver, the processor configured to:
 determine indices of the multiple TCI states based on the received one bit-field included in the DCI; and 
 derive an association between the multiple TCI states indicated by the one bit-field and a downlink data transmission of each of the TRPs, 
   wherein the transceiver is further configured to receive, the downlink data transmission from each of the TRPs with the QCL configuration indicated by the derived association.   
     
     
         2 . The UE of  claim 1 , wherein each value of the one bit-field corresponds to one or two TCI states. 
     
     
         3 . The UE of  claim 2 , wherein:
 a demodulation reference signal (DMRS) antenna port associated with a reception of a first codeword in the downlink data transmission is quasi co-located with reference signals configured in a first TCI state; and   a DMRS antenna port associated with a reception of a second codeword in the downlink data transmission is quasi co-located with reference signals configured in a second TCI state.   
     
     
         4 . The UE of  claim 1 , wherein the transceiver is further configured to:
 receive a control resource set and a search space to monitor downlink control channels; and   receive higher layer signaling that configures the multiple TCI states and a monitoring pattern for monitoring the downlink control channels associated with the control resource set.   
     
     
         5 . The UE of  claim 4 , wherein the processor is further configured to calculate one or more TCI states for a physical downlink control channel (PDCCH) detection occasion based on the configured multiple TCI states and monitoring pattern. 
     
     
         6 . The UE of  claim 5 , wherein the processor is further configured to calculate a QCL configuration for each of the multiple TCI states to receive the downlink control channels. 
     
     
         7 . The UE of  claim 6 , wherein each of the multiple TCI states is swept across symbols within the control resource set, and
 wherein a number of consecutive symbols within the control resource set is configured by the higher layer signaling and the QCL configuration is configured for each of the symbols.   
     
     
         8 . A transmission reception point (TRP), for a beam indication in a wireless communication system, the BS comprising:
 a processor configured to determine indices of multiple transmission configuration indicator (TCI) states based on a one bit-field to be transmitted to a user equipment (UE), wherein the one bit-field is included in downlink control information (DCI); and   a transceiver operably connected to the processor, the transceiver is configured to:
 transmit, to the UE, a downlink data transmission, 
 transmit the DCI that includes a beam indication configuration comprising the one bit-field that indicates the multiple TCI states, wherein the multiple TCI states indicate a quasi-colocation (QCL) configuration for a downlink data channel transmitted to the UE, and 
 transmit, to the UE, the downlink data transmission with the QCL configuration, wherein an association between the multiple TCI states indicated by the one bit-field and the downlink data transmission from the TRP is derived by the UE. 
   
     
     
         9 . The TRP of  claim 8 , wherein each value of the one bit-field corresponds to one or two TCI states. 
     
     
         10 . The TRP of  claim 9 , wherein:
 a demodulation reference signal (DMRS) antenna port associated with a reception of a first codeword in the downlink data transmission is quasi co-located with reference signals configured in a first TCI state; and   a DMRS antenna port associated with a reception of a second codeword in the downlink data transmission is quasi co-located with reference signals configured in a second TCI state.   
     
     
         11 . The TRP of  claim 8 , wherein the transceiver is further configured to:
 transmit a control resource set and a search space to monitor downlink control channels; and   transmit higher layer signaling that configures the multiple TCI states and a monitoring pattern for monitoring the downlink control channels associated with the control resource set.   
     
     
         12 . The TRP of  claim 11 , wherein the processor is further configured to determine one or more TCI states for a physical downlink control channel (PDCCH) detection occasion based on the configured multiple TCI states and the monitoring pattern. 
     
     
         13 . The TRP of  claim 12 , wherein the processor is further configured to determine a QCL configuration for each of the multiple TCI states to transmit the downlink control channels. 
     
     
         14 . The TRP of  claim 13 , wherein each of the multiple TCI states is swept across symbols within the control resource set, and
 wherein a number of consecutive symbols within the control resource set is configured by the higher layer signaling and the QCL configuration is configured for each of the symbols.   
     
     
         15 . A method of a user equipment (UE) for a beam indication in a wireless communication system, the method comprising:
 receiving, from multiple transmission reception points (TRPs), downlink data transmissions;   receiving downlink control information (DCI) that includes a beam indication configuration comprising a one bit-field that indicates multiple transmission configuration indicator (TCI) states, wherein the multiple TCI states indicate a quasi-colocation (QCL) configuration for downlink data channels received from the TRPs;   determining indices of the multiple TCI states based on the received one bit-field included in the DCI;   deriving an association between the multiple TCI states indicated by the one bit-field and a downlink data transmission of each of the TRPs; and   receiving the downlink data transmission from each of the TRPs with the QCL configuration indicated by the derived association.   
     
     
         16 . The method of  claim 15 , wherein each value of the one bit-field corresponds to one or two TCI states. 
     
     
         17 . The method of  claim 16 , wherein:
 a demodulation reference signal (DMRS) antenna port associated with a reception of a first codeword in the downlink data transmission is quasi co-located with reference signals configured in a first TCI state; and   a DMRS antenna port associated with a reception of a second codeword in the downlink data transmission is quasi co-located with reference signals configured in a second TCI state.   
     
     
         18 . The method of  claim 15 , further comprising:
 receiving a control resource set and a search space to monitor downlink control channels; and   receiving higher layer signaling that configures the multiple TCI states and a monitoring pattern for monitoring the downlink control channels associated with the control resource set.   
     
     
         19 . The method of  claim 18 , further comprising:
 calculating one or more TCI states for a physical downlink control channel (PDCCH) detection occasion based on the configured multiple TCI states and the monitoring pattern; and   calculating a QCL configuration for each of the multiple TCI states to receive the downlink control channels.   
     
     
         20 . The method of  claim 19 , wherein each of the multiple TCI states is swept across symbols within the control resource set, and
 wherein a number of consecutive symbols within the control resource set is configured by the higher layer signaling and the QCL configuration is configured for each of the symbols.