Channel State Information Reporting

Abstract

A user equipment (UE) configured to report Channel State Information (CSI) to a wireless network. The UE transmits a first sounding reference signal (SRS) on an uplink (UL) channel, receives a first channel state information reference signal (CSI-RS) on a downlink (DL) channel, wherein the first CSI-RS includes a first configuration of CSI-RS parameters based on the first SRS, performs first CSI-RS measurements based on the first configuration of CSI-RS parameters, transmits a first CSI report including the first CSI-RS measurements, transmits a second SRS on the UL channel, receives a second CSI-RS on the DL channel, wherein the second CSI-RS includes a second configuration of CSI-RS parameters based on the second SRS, performs second CSI-RS measurements based on the second configuration of CSI-RS parameters and transmits a second CSI report including the second CSI-RS measurements.

1 - 20 . (canceled) 
     
     
         21 . One or more processors configured to perform operations comprising:
 receiving, from a user equipment (UE), a first sounding reference signal (SRS) on an uplink (UL) channel;   transmitting, to the UE, a first channel state information reference signal (CSI-RS) on a downlink (DL) channel, wherein the first CSI-RS includes a first configuration of CSI-RS parameters based on the first SRS;   receiving, from the UE, a first CSI report including first CSI-RS measurements;   receiving, from the UE, a second SRS on the UL channel;   transmitting, to the UE, a second CSI-RS on the DL channel, wherein the second CSI-RS includes a second configuration of CSI-RS parameters based on the second SRS; and   receiving, from the UE, a second CSI report including the second CSI-RS measurements.   
     
     
         22 . The one or more processors of  claim 21 , wherein the first configuration of CSI-RS parameters includes a first number of nonzero power CSI-RS (NZP-CSI-RS) resources and the second configuration of CSI-RS parameters includes a second number of NZP-CSI-RS resources, and wherein the first number of NZP-CSI-RS resources is different than the second number of NZP-CSI-RS resources. 
     
     
         23 . The one or more processors of  claim 22 , wherein the operations further comprise:
 transmitting, to the UE, a radio resource control (RRC) transmission configuring a maximum number of NZP-CSI-RS resources.   
     
     
         24 . The one or more processors of  claim 23 , wherein the second configuration is transmitted via one of a medium access control control element (MAC-CE) transmission or a downlink control information (DCI) transmission, and wherein the second number of NZP-CSI-RS resources is a subset of the maximum number of NZP-CSI-RS resources. 
     
     
         25 . The one or more processors of  claim 24 , wherein each of the first number of NZP-CSI-RS resources includes a different number of ports, and wherein each of the second number of NZP-CSI-RS resources includes a different number of ports. 
     
     
         26 . The one or more processors of  claim 21 , wherein the first configuration of CSI-RS parameters includes a first number of ports for each CSI-RS resource and the second configuration of CSI-RS parameters includes a second number of ports for each CSI-RS resource, and wherein the first number of ports is different than the second number of ports. 
     
     
         27 . The one or more processors of  claim 26 , wherein the second number of ports is the same for each CSI-RS resource. 
     
     
         28 . The one or more processors of  claim 26 , wherein the operations further comprise:
 transmitting, to the UE, a radio resource control (RRC) transmission configuring a maximum number of ports.   
     
     
         29 . The one or more processors of  claim 28 , wherein the second configuration is transmitted via one of a MAC-CE transmission or DCI transmission, and wherein the second number of ports is a subset of the maximum number of ports. 
     
     
         30 . A base station, comprising:
 a transceiver configured to communicate with a user equipment (UE); and   
       one or more processors communicatively coupled to the transceiver and configured to perform operations comprising:
 receiving, from a user equipment (UE), a first sounding reference signal (SRS) on an uplink (UL) channel; 
 transmitting, to the UE, a first channel state information reference signal (CSI-RS) on a downlink (DL) channel, wherein the first CSI-RS includes a first configuration of CSI-RS parameters based on the first SRS; 
 receiving, from the UE, a first CSI report including first CSI-RS measurements; 
 receiving, from the UE, a second SRS on the UL channel; 
 transmitting, to the UE, a second CSI-RS on the DL channel, wherein the second CSI-RS includes a second configuration of CSI-RS parameters based on the second SRS; and 
 receiving, from the UE, a second CSI report including the second CSI-RS measurements. 
 
     
     
         31 . The base station of  claim 30 , wherein the first configuration of CSI-RS parameters includes a first number of nonzero power CSI-RS (NZP-CSI-RS) resources and the second configuration of CSI-RS parameters includes a second number of NZP-CSI-RS resources, and wherein the first number of NZP-CSI-RS resources is different than the second number of NZP-CSI-RS resources. 
     
     
         32 . The base station of  claim 31 , wherein the operations further comprise:
 transmitting, to the UE, a radio resource control (RRC) transmission configuring a maximum number of NZP-CSI-RS resources.   
     
     
         33 . The base station of  claim 32 , wherein the second configuration is transmitted via one of a medium access control control element (MAC-CE) transmission or a downlink control information (DCI) transmission, and wherein the second number of NZP-CSI-RS resources is a subset of the maximum number of NZP-CSI-RS resources. 
     
     
         34 . The base station of  claim 33 , wherein each of the first number of NZP-CSI-RS resources includes a different number of ports, and wherein each of the second number of NZP-CSI-RS resources includes a different number of ports. 
     
     
         35 . The base station of  claim 30 , wherein the first configuration of CSI-RS parameters includes a first number of ports for each CSI-RS resource and the second configuration of CSI-RS parameters includes a second number of ports for each CSI-RS resource, and wherein the first number of ports is different than the second number of ports. 
     
     
         36 . The base station of  claim 35 , wherein the second number of ports is the same for each CSI-RS resource. 
     
     
         37 . The base station of  claim 35 , wherein the operations further comprise:
 transmitting, to the UE, a radio resource control (RRC) transmission configuring a maximum number of ports.   
     
     
         38 . The base station of  claim 37 , wherein the second configuration is transmitted via one of a MAC-CE transmission or DCI transmission, and wherein the second number of ports is a subset of the maximum number of ports. 
     
     
         39 . A method performed by a base station, comprising:
 receiving, from a user equipment (UE), a first sounding reference signal (SRS) on an uplink (UL) channel;   transmitting, to the UE, a first channel state information reference signal (CSI-RS) on a downlink (DL) channel, wherein the first CSI-RS includes a first configuration of CSI-RS parameters based on the first SRS;   receiving, from the UE, a first CSI report including first CSI-RS measurements;   receiving, from the UE, a second SRS on the UL channel;   transmitting, to the UE, a second CSI-RS on the DL channel, wherein the second CSI-RS includes a second configuration of CSI-RS parameters based on the second SRS; and   receiving, from the UE, a second CSI report including the second CSI-RS measurements.   
     
     
         40 . The method of  claim 39 , wherein the first configuration of CSI-RS parameters includes a first number of nonzero power CSI-RS (NZP-CSI-RS) resources and the second configuration of CSI-RS parameters includes a second number of NZP-CSI-RS resources, and wherein the first number of NZP-CSI-RS resources is different than the second number of NZP-CSI-RS resources.