Channel raster design in wireless communications

Abstract

Aspects of the present disclosure describe determining an uplink channel raster for determining frequency location of an uplink channel over which to transmit uplink communications to a base station. Uplink communications can be transmitted to the base station over the uplink channel. The uplink channel raster can be shifted, in frequency, with respect to a legacy uplink channel raster of a legacy communication technology to facilitate coexistence, in an uplink carrier, of the uplink channel and one or more uplink channels of the legacy communication technology.

What is claimed is: 
     
         1 . A method for wireless communications by a user equipment (UE), comprising:
 determining an uplink channel raster for an uplink channel of a first system;   determining to shift, with respect to the uplink channel raster, an uplink transmission over the uplink channel by an offset in frequency, wherein the shift of the uplink transmission is based at least in part on tones of uplink carriers of the first system not being aligned with tones of uplink carriers of a second system; and   transmitting the shifted uplink transmission, wherein the shifted uplink transmission aligns in frequency with a second uplink channel of the second system.   
     
     
         2 . The method of  claim 1 , wherein the offset in frequency is 7.5 kilohertz. 
     
     
         3 . The method of  claim 1 , wherein the first system is new radio (NR) and the second system is long term evolution (LTE). 
     
     
         4 . The method of  claim 1 , further comprising:
 receiving, from a base station, a parameter indicating to shift the uplink transmission by the offset in frequency, wherein the shift of the uplink transmission is based at least in part on receiving the parameter.   
     
     
         5 . The method of  claim 1 , wherein the offset in frequency is in a range of 7 to 8 kilohertz. 
     
     
         6 . The method of  claim 1 , further comprising:
 identifying a downlink channel raster for a downlink channel over which to receive downlink communications from a base station,   wherein the uplink channel raster is of a different value than the downlink channel raster.   
     
     
         7 . The method of  claim 1 , further comprising:
 determining an uplink frequency for the uplink channel based on one or more of the offset, the uplink channel raster, and an uplink channel number, and   wherein transmitting the shifted uplink transmission includes transmitting the shifted uplink transmission over the uplink frequency.   
     
     
         8 . A method for wireless communications by a user equipment (UE), comprising:
 determining an uplink channel raster for an uplink channel of a first system;   determining to shift, with respect to the uplink channel raster, an uplink transmission over the uplink channel by an offset in frequency, wherein the offset in frequency is less than a subcarrier spacing associated with a second system; and   transmitting the shifted uplink transmission, wherein the shifted uplink transmission aligns in frequency with a second uplink channel of the second system.   
     
     
         9 . The method of  claim 8 , wherein the offset in frequency is 7.5 kilohertz. 
     
     
         10 . The method of  claim 8 , wherein the first system is new radio (NR) and the second system is long term evolution (LTE). 
     
     
         11 . The method of  claim 8 , further comprising receiving, from a base station, a parameter indicating to shift the uplink transmission by the offset in frequency, wherein the shift of the uplink transmission is based at least in part on receiving the parameter. 
     
     
         12 . An apparatus for wireless communication, comprising:
 a transceiver;   a memory configured to store instructions; and   one or more processors communicatively coupled with the transceiver and the memory, wherein the one or more processors are configured to cause the apparatus to:
 determine an uplink channel raster for an uplink channel of a first system; 
 determine to shift, with respect to the uplink channel raster, an uplink transmission over the uplink channel by an offset in frequency, wherein the shift of the uplink transmission is based at least in part on tones of uplink carriers of the first system not being aligned with tones of uplink carriers of a second system; and 
 transmit the shifted uplink transmission, wherein the shifted uplink transmission aligns in frequency with a second uplink channel of the second system. 
   
     
     
         13 . The apparatus of  claim 12 , wherein the offset in frequency is 7.5 kilohertz. 
     
     
         14 . The apparatus of  claim 12 , wherein the first system is new radio (NR) and the second system is long term evolution (LTE). 
     
     
         15 . The apparatus of  claim 12 , wherein the one or more processors are further configured to cause the apparatus to receive, from a base station, a parameter indicating to shift the uplink transmission by the offset in frequency, wherein the one or more processors are configured to cause the apparatus to shift the uplink transmission based at least in part on receiving the parameter. 
     
     
         16 . The apparatus of  claim 12 , wherein the offset in frequency in a range of 7 to 8 kilohertz. 
     
     
         17 . The apparatus of  claim 12 , wherein the one or more processors are further configured to cause the apparatus to:
 determine an uplink frequency for the uplink channel based on one or more of the offset, the uplink channel raster, and an uplink channel number, and   wherein the one or more processors are configured to cause the apparatus to transmit the shifted uplink transmission over the uplink frequency.   
     
     
         18 . The apparatus of  claim 12 , wherein the one or more processors are configured to cause the apparatus to transmit the shifted uplink transmission as uplink control signaling over the uplink channel, and transmit uplink data over a third uplink channel of the first system. 
     
     
         19 . An apparatus for wireless communication, comprising:
 a transceiver;   a memory configured to store instructions; and   one or more processors communicatively coupled with the transceiver and the memory, wherein the one or more processors are configured to cause the apparatus to:
 determine an uplink channel raster for an uplink channel of a first system; 
 determine to shift, with respect to the uplink channel raster, an uplink transmission over the uplink channel by an offset in frequency, wherein the offset in frequency is less than a subcarrier spacing associated with a second system; and 
 transmit the shifted uplink transmission, wherein the shifted uplink transmission aligns in frequency with a second uplink channel of the second system. 
   
     
     
         20 . The apparatus of  claim 19 , wherein the offset in frequency is 7.5 kilohertz.