Method and device for determining rsrp in nr v2x

Abstract

A method for performing wireless communication by a first device and a device for supporting same are provided. The method may include receiving a plurality of reference signals from a second device through a physical sidelink control channel (PSCCH) or a physical sidelink shared channel (PSSCH), herein, the plurality of reference signals are transmitted through a plurality of antenna ports, determining a reference signal received power (RSRP) value using the plurality of reference signals based on indexes for the plurality of antenna ports, and transmitting the RSRP value to the second device.

What is claimed is: 
     
         1 . A method for performing wireless communication by a first device, the method comprising:
 receiving, from a second device through a physical sidelink control channel (PSCCH), sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH);   receiving, from the second device, a plurality of demodulation reference signals (DMRS s),   wherein the plurality of DMRSs are received through a plurality of antenna ports; and   determining a reference signal received power (RSRP) for the PSSCH based on the plurality of DMRSs,   wherein the RSRP is determined as a sum of a plurality of linear average values of power contributions of the plurality of DMRSs, summed over the plurality of antenna ports.   
     
     
         2 . The method of  claim 1 , further comprising:
 transmitting the RSRP to the second device,   wherein the SCI includes antenna port information related to the plurality of DMRSs for the PSSCH.   
     
     
         3 . The method of  claim 1 , wherein the plurality of DMRSs are received in resource elements included in DMRS symbols in a slot for the PSSCH,
 wherein the RSRP is determined based on the resource elements, and   wherein the sum of the plurality of the linear average values of the power contributions of the plurality of DMRSs are a sum of a plurality of linear average values of power contributions of the resource elements.   
     
     
         4 . The method of  claim 1 , wherein the plurality of the linear average values are determined based on weights related with the plurality of antenna ports. 
     
     
         5 . The method of  claim 1 , wherein information related to whether at least one DMRS among the plurality of DMRSs performs frequency division multiplexing (FDM) with sidelink data is transmitted via predefined signaling. 
     
     
         6 . The method of  claim 5 , further comprising:
 compensating a configured value for the RSRP based on the at least one DMRS being performed FDM with the sidelink data.   
     
     
         7 . The method of  claim 6 , wherein the configured value is determined based on a ratio of REs occupied by the at least one DMRS among all resource elements (RE) in a symbol. 
     
     
         8 . The method of  claim 7 , wherein the configured value is determined based on a ratio of power occupied by REs related to the at least one DMRS among powers for all symbols related to the at least one DMRS. 
     
     
         9 . The method of  claim 5 , wherein at least one DMRS is omitted from RSRP measurement, based on the at least one DMRS being performed FDM with the sidelink data. 
     
     
         10 . The method of  claim 9 , wherein boosting related to an energy per resource element (EPRE) for the PSSCH or boosting related to a power spectral density (PSD) for the PSSCH is performed. 
     
     
         11 . The method of  claim 9 , further comprising:
 compensating for a value related to the at least one DMRS for the RSRP.   
     
     
         12 . The method of  claim 1 , wherein the SCI includes information related to whether at least one DMRS among the plurality of DMRSs is performed frequency division multiplexing (FDM) with sidelink data. 
     
     
         13 . The method of  claim 12 , wherein the SCI includes at least one of information related to an EPRE between the at least one DMRS and sidelink data or information related to a PSD between the at least one DMRS and sidelink data. 
     
     
         14 . A first device for performing wireless communication, the first device comprising:
 one or more transceivers;   one or more processors; and   one or more memories operably connectable to the one or more processors and storing instructions that, based on being executed by the one or more processors, perform operations comprising:   receiving, from a second device through a physical sidelink control channel (PSCCH), sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH),   receiving, from the second device, a plurality of demodulation reference signals (DMRSs),   wherein the plurality of DMRSs are received through a plurality of antenna ports, and   determining a reference signal received power (RSRP) for the PSSCH based on the plurality of DMRSs,   wherein the RSRP is determined as a sum of a plurality of linear average values of power contributions of the plurality of DMRSs, summed over the plurality of antenna ports.   
     
     
         15 . The first device of  claim 14 , wherein the plurality of DMRSs are received in resource elements included in DMRS symbols in a slot for the PSSCH,
 wherein the RSRP is determined based on the resource elements, and   wherein the sum of the plurality of the linear average values of the power contributions of the plurality of DMRSs are a sum of a plurality of linear average values of power contributions of the resource elements.   
     
     
         16 . The first device of  claim 14 , wherein information related to whether at least one DMRS among the plurality of DMRSs performs frequency division multiplexing (FDM) with sidelink data is transmitted via predefined signaling, and
 at least one DMRS is omitted from RSRP measurement, based on the at least one DMRS being performed FDM with the sidelink data.   
     
     
         17 . The first device of  claim 16 , wherein boosting related to an energy per resource element (EPRE) for the PSSCH or boosting related to a power spectral density (PSD) for the PSSCH is performed. 
     
     
         18 . A device configured to control a first user equipment (UE), the device comprising:
 one or more processors; and   one or more memories operably connectable to the one or more processors and storing instructions that, based on being executed by the one or more processors, perform operations comprising:   receiving, from a second UE through a physical sidelink control channel (PSCCH), sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH),   receiving, from the second UE, a plurality of demodulation reference signals (DMRSs),   wherein the plurality of DMRSs are received through a plurality of antenna ports, and   determining a reference signal received power (RSRP) for the PSSCH based on the plurality of DMRSs,   wherein the RSRP is determined as a sum of a plurality of linear average values of power contributions of the plurality of DMRSs, summed over the plurality of antenna ports.   
     
     
         19 . The device of  claim 18 , wherein the plurality of DMRSs are received in resource elements included in DMRS symbols in a slot for the PSSCH,
 wherein the RSRP is determined based on the resource elements, and   wherein the sum of the plurality of the linear average values of the power contributions of the plurality of DMRSs are a sum of a plurality of linear average values of power contributions of the resource elements.   
     
     
         20 . The device of  claim 18 , wherein the SCI includes information related to whether at least one DMRS among the plurality of DMRSs is performed frequency division multiplexing (FDM) with sidelink data, and
 wherein the SCI includes at least one of information related to an EPRE between the at least one DMRS and sidelink data or information related to a PSD between the at least one DMRS and sidelink data.