Determining channel state information in 5g wireless communication systems with phase tracking

Abstract

The disclosed subject matter relates to techniques for determining channel state information (CSI) in New Radio (NR) access communication systems with phase tracking. In one embodiment, a method is provided that comprises receiving, by a device comprising a processer, configuration information from a network device of a wireless communication network indicating that a PTRS protocol has been configured for wireless communications between the device and the network device. The method further comprises, determining, by the device, a resource density of resource elements of the wireless communication network allocated for the phase tracking reference signal protocol, determining, by the device, CSI based on the resource density, and reporting, by the device, the CSI to the network device.

What is claimed is: 
     
         1 . A device, comprising:
 a processor; and   a memory that stores executable instructions that, when executed by the processor, facilitate performance of operations, comprising:
 determining channel state information based on an assumed density of resource elements to be used for a transmission of phase tracking reference signals to the device by network equipment without knowledge of an actual density of the resource elements to be used for the transmission; and 
 sending the channel state information to the network equipment. 
   
     
     
         2 . The device of  claim 1 , wherein the determining comprises excluding assumed resource elements of the resource elements allocated for the phase tracking reference signals in association with the determining of the channel state information. 
     
     
         3 . The device of  claim 1 , wherein the operations further comprise:
 receiving the transmission after the sending in accordance with the actual density of the resource element for the phase tracking reference signals;   determining updated channel state information based the actual density based on the actual density being different from the assumed density; and   sending the updated channel state information to the network equipment.   
     
     
         4 . The device of  claim 1 , wherein the actual density is variable from the default density. 
     
     
         5 . The device of  claim 1 , wherein the determining is responsive to reception of activation information from the network equipment indicating that a phase tracking reference signal protocol has been activated for communication between the device and the network equipment. 
     
     
         6 . The device of  claim 1 , wherein, as a result of the sending of the channel state information, the network equipment is to employ the channel state information to determine a downlink communication scheduling parameter for a downlink transmission of the communication. 
     
     
         7 . The device of  claim 1 , wherein the assumed density comprises an assumed time density value and an assumed frequency density value for the resource elements. 
     
     
         8 . The device of  claim 7 , wherein the assumed time density value and the assumed frequency density value are respectively set to zero and consistent with an assumption that no resource elements are to be used for the actual density of the resource elements for the phase tracking reference signals. 
     
     
         9 . The device of  claim 1 , wherein the determining of the channel state information comprises determining a rank indicator, a precoding matrix indicator, and a channel quality indicator based on the assumed density. 
     
     
         10 . A method, comprising:
 determining, by a device comprising a processor, channel state information based on an assumed allocation of resource elements to be used for a transmission of phase tracking reference signals to the device by network equipment independent of an actual allocation of the resource elements to be used for the transmission; and   sending, by the device, the channel state information to the network equipment.   
     
     
         11 . The method of  claim 10 , wherein the determining comprises excluding assumed resources elements of the resource elements allocated for the phase tracking reference signals in association with the determining of the channel state information. 
     
     
         12 . The method of  claim 10 , wherein the operations further comprise:
 receiving, by the device, the transmission after the sending in accordance with the actual density of the resource element for the phase tracking reference signals;   determining, by the device, updated channel state information based the actual density based on the actual density being different from the assumed density; and   sending, by the device, the updated channel state information to the network equipment.   
     
     
         13 . The method of  claim 10 , wherein the actual density is variable from the default density. 
     
     
         14 . The method of  claim 10 , wherein the determining is responsive to reception of activation information from the network equipment indicating that a phase tracking reference signal protocol has been activated for communication between the device and the network equipment. 
     
     
         15 . The method of  claim 10 , wherein, as a result of the sending of the channel state information, the network equipment is to employ the channel state information to determine a downlink communication scheduling parameter for a downlink transmission of the communication. 
     
     
         16 . The method of  claim 10 , wherein the determining of the channel state information comprises determining a rank indicator, a precoding matrix indicator, and a channel quality indicator based on the assumed allocation. 
     
     
         17 . A method, comprising:
 sending, by network equipment comprising a processor to a device, activation information indicating that a phase tracking reference signal protocol has been activated for communication between the device and the network equipment; and   receiving, by the network equipment in response to the sending, channel state information from the device determined by the device based on an assumed allocation of resource elements to be used for a transmission of phase tracking reference signals to the device by the network equipment without knowledge of an actual allocation of the resource elements to be used for the transmission.   
     
     
         18 . The method of  claim 17 , further comprising:
 employing, by the network equipment, the channel state information to determine downlink communication scheduling parameters for downlink transmissions of the communications.   
     
     
         19 . The method of  claim 17 , further comprising:
 determining, by the network equipment, the actual allocation of the resource elements for the transmission based on the channel state information; and   sending, by the network equipment, the transmission of the phase tracking reference signals to the device using the actual allocation.   
     
     
         20 . The method of  claim 19 , further comprising:
 receiving, by the network equipment, updated channel state information from the device determined by the device based on the actual allocation in response to the actual allocation being different from the assumed allocation.