Cell-specific reference signal transmissions for evolved machine type communication

Abstract

The present disclosure provides reduced cell-specific reference signal (CRS) transmissions for evolved machine type communication (eMTC). In one aspect, a network entity may determine at least one narrow band for transmission of a CRS. The network entity may further identify one or more resource blocks proximate the at least one narrow band and transmit the CRS on the narrow band and the one or more proximate resource blocks to a UE. In another aspect, a UE may apply a receive window to filter one or more noise samples outside at least one narrow band allocation, the receive window corresponding to one or more resource blocks located outside the defined number of resource blocks of the at least one narrow band allocation. The UE may further receive the CRS within the at least one narrow band allocation from a network entity in response to applying the receive window.

What is claimed is: 
     
         1 . A method of wireless communications at a network entity, comprising:
 determining at least one narrow band for transmission of a cell-specific reference signal (CRS) to a user equipment (UE);   identifying one or more resource blocks proximate the at least one narrow band; and   transmitting the CRS on the narrow band and the one or more proximate resource blocks to the UE.   
     
     
         2 . The method of  claim 1 , wherein the at least one narrow band corresponds to a defined number of resource blocks allocated for CRS transmission. 
     
     
         3 . The method of  claim 2 , wherein the one or more proximate resource blocks are adjacent to the defined number of resource blocks forming the narrow band. 
     
     
         4 . The method of  claim 3 , wherein the one or more proximate resource blocks are adjacent to the defined number of resource blocks on at least one side of the at least one narrow band. 
     
     
         5 . The method of  claim 1 , wherein a size of the one or more proximate resource blocks is based on a power factor. 
     
     
         6 . A network entity, comprising:
 a memory; and   at least one processor in communication with the memory and configured to:
 determine at least one narrow band for transmission of a cell-specific reference signal (CRS) to a user equipment (UE); 
 identify one or more resource blocks proximate the at least one narrow band; and 
 transmit the CRS on the narrow band and the one or more proximate resource blocks to the UE. 
   
     
     
         7 . The network entity of  claim 6 , wherein the at least one narrow band corresponds to a defined number of resource blocks allocated for CRS transmission. 
     
     
         8 . The network entity of  claim 7 , wherein the one or more proximate resource blocks are adjacent to the defined number of resource blocks forming the narrow band. 
     
     
         9 . The network entity of  claim 8 , wherein the one or more proximate resource blocks are adjacent to the defined number of resource blocks on at least one side of the at least one narrow band. 
     
     
         10 . The network entity of  claim 6 , wherein a size of the one or more proximate resource blocks is based on a power factor. 
     
     
         11 . An apparatus for wireless communications, comprising:
 means for determining at least one narrow band for transmission of a cell-specific reference signal (CRS) to a user equipment (UE);   means for identifying one or more resource blocks proximate the at least one narrow band; and   means for transmitting the CRS on the narrow band and the one or more proximate resource blocks to the UE.   
     
     
         12 . The apparatus of  claim 11 , wherein the at least one narrow band corresponds to a defined number of resource blocks allocated for CRS transmission. 
     
     
         13 . The apparatus of  claim 12 , wherein the one or more proximate resource blocks are adjacent to the defined number of resource blocks forming the narrow band. 
     
     
         14 . The apparatus of  claim 13 , wherein the one or more proximate resource blocks are adjacent to the defined number of resource blocks on at least one side of the at least one narrow band. 
     
     
         15 . The apparatus of  claim 11 , wherein a size of the one or more proximate resource blocks is based on a power factor. 
     
     
         16 . An non-transitory computer-readable medium storing computer code executable by a processor for wireless communications, comprising code for:
 determining at least one narrow band for transmission of a cell-specific reference signal (CRS) to a user equipment (UE);   identifying one or more resource blocks proximate the at least one narrow band; and   transmitting the CRS on the narrow band and the one or more proximate resource blocks to the UE.   
     
     
         17 . The non-transitory computer-readable medium of  claim 16 , wherein the at least one narrow band corresponds to a defined number of resource blocks allocated for CRS transmission. 
     
     
         18 . The non-transitory computer-readable medium of  claim 17 , wherein the one or more proximate resource blocks are adjacent to the defined number of resource blocks forming the narrow band. 
     
     
         19 . The non-transitory computer-readable medium of  claim 18 , wherein the one or more proximate resource blocks are adjacent to the defined number of resource blocks on at least one side of the at least one narrow band. 
     
     
         20 . The non-transitory computer-readable medium of  claim 16 , wherein a size of the one or more proximate resource blocks is based on a power factor.