High doppler channel performance enhancement

Abstract

A base station may determine a Doppler metric associated with a wireless channel and a user equipment (UE). The Doppler metric may be determined from received information related to Doppler effects measured by the UE or from directly measured Doppler effects associated with uplink data received from the UE. Based on the determined Doppler metric, the base station may select one or both of a reference signal (RS) density and a channel estimation technique for the wireless channel and associated UE. The base station may transmit an indication of the RS density to the UE. Downlink data bursts and uplink data bursts may include RSs and data according to the indicated RS density. Further, the base station may transmit to the UE, an indication to communicate using the selected wireless channel estimation technique.

What is claimed is: 
     
         1 . A method of wireless communication comprising:
 selecting a reference signal configuration from a plurality of reference signal configurations, the plurality of reference signal configurations indicating a plurality of reference signal density configurations and a plurality of decoding processing timelines; and   transmitting, by a base station to a user equipment (UE), an indication of the reference signal configuration indicating a first reference signal density configuration and a decoding processing timeline for communicating with the UE.   
     
     
         2 . The method of  claim 1 , wherein the plurality of reference signal density configurations comprise a plurality of reference signal positions and reference signal quantities within a transmit time interval. 
     
     
         3 . The method of  claim 1 , further comprising:
 transmitting, by the base station, a downlink data burst including reference signals and data in accordance with the first reference signal density configuration.   
     
     
         4 . The method of  claim 1 , further comprising:
 receiving, by the base station, an uplink data burst including reference signals and data in accordance with the first reference signal density configuration.   
     
     
         5 . The method of  claim 1 , further comprising:
 determining a Doppler characteristic associated with a wireless channel and the UE; and   communicating with the UE in accordance with the first reference signal density configuration and based at least in part on the Doppler characteristic.   
     
     
         6 . The method of  claim 1 , further comprising:
 determining that a Doppler characteristic associated with a wireless channel and the UE satisfies a first threshold, wherein the decoding processing timeline is associated with an extrapolation wireless channel estimation technique; and   communicating with the UE in accordance with the first reference signal density configuration and based at least in part on the Doppler characteristic.   
     
     
         7 . The method of  claim 1 , further comprising:
 determining that a Doppler characteristic associated with a wireless channel and the UE satisfies a second threshold, wherein the decoding processing timeline is associated with an interpolation wireless channel estimation technique; and   communicating with the UE in accordance with the first reference signal density configuration and based at least in part on the Doppler characteristic.   
     
     
         8 . The method of  claim 1 , further comprising:
 determining a Doppler characteristic associated with a wireless channel and the UE;   determining that the Doppler characteristic indicates a higher Doppler shift value than a previously-determined Doppler characteristic; and   determining a second reference signal density configuration based at least in part on the Doppler characteristic, the second reference signal density configuration having more reference signals per transmit time interval than the first reference signal density configuration.   
     
     
         9 . The method of  claim 1 , wherein transmitting, by the base station to the UE, the indication of the reference signal configuration comprises:
 transmitting, via a signaling radio bearer channel, the indication of the reference signal configuration.   
     
     
         10 . A method of wireless communication comprising:
 receiving, by user equipment (UE), an indication of a reference signal configuration indicating a first reference signal density configuration and a decoding processing timeline; and   receiving one or more reference signals and data in accordance with the reference signal configuration; and   decoding the data based at least in part on the decoding processing timeline.   
     
     
         11 . The method of  claim 10 , further comprising:
 determining a Doppler characteristic associated with a wireless channel and a base station, and   wherein receiving one or more reference signals and data comprises receiving the one or more reference signals and the data from the base station in accordance with the reference signal configuration and based at least in part on the Doppler characteristic.   
     
     
         12 . The method of  claim 10 , wherein the first reference signal density configuration is indicated from a plurality of reference signal density configurations, the plurality of reference signal density configurations indicating a plurality of reference signal positions and reference signal quantities within a transmission time interval. 
     
     
         13 . The method of  claim 10 , wherein the decoding processing timeline is indicated from a plurality of decoding processing timelines, the plurality of decoding processing timelines associated with extrapolation and interpolation wireless channel estimation techniques. 
     
     
         14 . The method of  claim 10 , further comprising:
 transmitting, by the UE, information related to Doppler effects measured by the UE, and wherein receiving the indication of the reference signal configuration is based at least in part on transmitting the information related to the Doppler effects.   
     
     
         15 . The method of  claim 10 , wherein communicating with the base station comprises:
 transmitting, by the UE, an uplink data burst including reference signals and data in accordance with the first reference signal density configuration.   
     
     
         16 . The method of  claim 10 , further:
 transmitting, by the UE, an indication of a suggested reference signal density configuration.   
     
     
         17 . The method of  claim 10 , wherein receiving, by the UE, the indication of the reference signal configuration comprises:
 receiving, via a signaling radio bearer channel, the indication of the reference signal configuration.   
     
     
         18 . The method of  claim 10 , wherein receiving, by the UE, the indication of the reference signal configuration comprises:
 receiving, via a resource grant from the base station, the indication of the reference signal configuration.   
     
     
         19 . An apparatus for wireless communication, comprising:
 a processor;   memory coupled with the processor; and   instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
 select a reference signal configuration from a plurality of reference signal configurations, the plurality of reference signal configurations indicating a plurality of reference signal density configurations and a plurality of decoding processing timelines; and 
 transmit, to a user equipment (UE), an indication of the reference signal configuration indicating a first reference signal density configuration and a decoding processing timeline for communicating with the UE. 
   
     
     
         20 . An apparatus for wireless communication, comprising:
 a processor;   memory coupled with the processor; and   instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
 receive an indication of a reference signal configuration indicating a first reference signal density configuration and a decoding processing timeline; 
 receive one or more reference signals and data in accordance with the reference signal configuration; and 
 decode the data based at least in part on the decoding processing timeline.