Method and apparatus for improving precoding resource block group in a wireless communication system

Abstract

A method and apparatus are disclosed from the perspective of a UE. In one embodiment, the method includes the UE receiving a configuration of functionality of PRB bundling from a base station. The method also includes the UE receiving an indication from the base station regarding whether the functionality of PRB bundling is applied to a TTI or not.

What is claimed is: 
     
         1 . A method of operation of a User Equipment (UE), the method comprising:
 receiving a configuration for a first bandwidth portion and a second bandwidth portion of a system bandwidth of a cell, wherein the second bandwidth portion differs from the first bandwidth portion;   receiving a configuration for a first precoding resource group (PRG) size for the first bandwidth portion;   receiving a configuration for a second PRG size for the second bandwidth portion, wherein the second PRG size is different from the first PRG size;   determining each of a plurality of PRGs within the first bandwidth portion according to the first PRG size; and   determining each of a plurality of PRGs within the second bandwidth portion according to the second PRG size.   
     
     
         2 . The method of  claim 1 , wherein the configuration for the first bandwidth portion and the second bandwidth portion is included in a dedicated signaling from a base station that indicates a division of the system bandwidth of the cell. 
     
     
         3 . The method of  claim 1 , wherein the first bandwidth portion does not overlap with any part of the second bandwidth portion. 
     
     
         4 . The method of  claim 1 , wherein the configuration for the first bandwidth portion and the second bandwidth portion includes a first bandwidth portion size, a first bandwidth portion location, a second bandwidth portion size and a second bandwidth portion location. 
     
     
         5 . The method of  claim 1 , further comprising receiving downlink data from a base station. 
     
     
         6 . The method of  claim 1 , further comprising partitioning the first bandwidth portion by the first PRG size and the second bandwidth portion by the second PRG size. 
     
     
         7 . The method of  claim 1 , wherein the first PRG size follows non-increasing order in frequency domain within the first bandwidth portion, and the second PRG size follows non-increasing order in frequency domain within the second bandwidth portion. 
     
     
         8 . The method of  claim 1 , wherein a plurality of the PRGs of the first bandwidth portion have the first PRG size, and a plurality of PRGs of the second bandwidth portion have the second PRG size. 
     
     
         9 . A method of communications between a User Equipment (UE) and a base station (BS) in a cell, the method comprising:
 dividing a system bandwidth of the cell into a first bandwidth portion and a second bandwidth portion, wherein the second bandwidth portion differs from the first bandwidth portion;   defining a first precoding resource group (PRG) size for the first bandwidth portion;   defining a second PRG size for the second bandwidth portion, wherein the second PRG size is different from the first PRG size;   determining each of a plurality of PRGs within the first bandwidth portion according to the first PRG size; and   determining each of a plurality of PRGs within the second bandwidth portion according to the second PRG size.   
     
     
         10 . The method of  claim 9 , further comprising the BS providing to the UE a dedicated signaling indicating a configuration for the division of the first bandwidth portion and the second bandwidth portion of the system bandwidth. 
     
     
         11 . The method of  claim 10 , wherein the configuration for the first bandwidth portion and the second bandwidth portion includes a first bandwidth portion size, a first bandwidth portion location, a second bandwidth portion size and a second bandwidth portion location. 
     
     
         12 . The method of  claim 9 , wherein the first bandwidth portion does not overlap with any part of the second bandwidth portion. 
     
     
         13 . The method of  claim 9 , further comprising receiving downlink data from the base station. 
     
     
         14 . The method of  claim 9 , further comprising partitioning the first bandwidth portion by the first PRG size and the second bandwidth portion by the second PRG size. 
     
     
         15 . The method of  claim 9 , wherein the first PRG size follows non-increasing order in frequency domain within the first bandwidth portion, and the second PRG size follows non-increasing order in frequency domain within the second bandwidth portion. 
     
     
         16 . A method of operation of a Base Station (BS), the method comprising:
 dividing a first bandwidth portion and a second bandwidth portion of a system bandwidth of a cell such that the second bandwidth portion differs from the first bandwidth portion;   determining each of a plurality of precoding resource groups (PRGs) within the first bandwidth portion according to a first PRG size;   determining each of a plurality of PRGs within the second bandwidth portion according a the second PRG size, wherein the second PRG size is different from the first PRG size.   
     
     
         17 . The method of  claim 16 , further comprising communicating to a User Equipment (UE) a configuration for the first bandwidth portion and the second bandwidth portion of a system bandwidth of the cell, including a first bandwidth portion size, a first bandwidth portion location, a second bandwidth portion size and a second bandwidth portion location. 
     
     
         18 . The method of  claim 17 , further comprising communicating to a UE the first PRG size and the second PRG size. 
     
     
         19 . The method of  claim 16 , wherein the first PRG size follows non-increasing order in frequency domain within the first bandwidth portion, and the second PRG size follows non-increasing order in frequency domain within the second bandwidth portion. 
     
     
         20 . The method of  claim 16 , wherein a plurality of the PRGs of the first bandwidth portion have the first PRG size, and a plurality of PRGs of the second bandwidth portion have the second PRG size.