Coordinated Multipoint Transmission and Reception (CoMP)

Abstract

A wireless communications method implemented in a network system that supports coordinated multipoint transmission and reception (CoMP) is disclosed. The wireless communications method includes informing a user equipment (UE) semi-statically of a codebook subset for each channel state information (CSI) process, wherein the UE is restricted to report an indication of a precoding matrix within the codebook subset. Other methods, apparatuses, and systems are also disclosed.

What is claimed is: 
     
         1 . A wireless communications method implemented in a network system that supports coordinated multipoint transmission and reception (CoMP), the wireless communications method comprising:
 informing a user equipment (UE) semi-statically of a codebook subset for each channel state information (CSI) process,   wherein the UE is restricted to report an indication of a precoding matrix within the codebook subset.   
     
     
         2 . The wireless communications method as in  claim 1 , wherein the indication is a PMI (precoding matrix index). 
     
     
         3 . The wireless communications method as in  claim 1 , wherein the CSI process is associated with a choice of a transmission points (TP) in a CoMP set. 
     
     
         4 . The wireless communications method as in  claim 3 , wherein the CoMP set comprises a CoMP measurement set. 
     
     
         5 . The wireless communications method as in  claim 1 , wherein the method is implemented in a network controller. 
     
     
         6 . A wireless communications method implemented in a user equipment (UE) used in network system that supports coordinated multipoint transmission and reception (CoMP), the wireless communications method comprising:
 semi-statically receiving a codebook subset for each channel state information (CSI) process,   wherein the UE is restricted to report an indication of a precoding matrix within the codebook subset.   
     
     
         7 . The wireless communications method as in  claim 6 , wherein the indication is a PMI (precoding matrix index). 
     
     
         8 . The wireless communications method as in  claim 6 , wherein the CSI process is associated with a choice of a transmission points (TP) in a CoMP set. 
     
     
         9 . The wireless communications method as in  claim 8 , wherein the CoMP set comprises a CoMP measurement set. 
     
     
         10 . A wireless communications system that supports coordinated multipoint transmission and reception (CoMP), the wireless communications system comprising:
 a user equipment (UE);   a network controller to inform the user equipment (UE) semi-statically of a codebook subset for each channel state information (CSI) process,   wherein the UE is restricted to report an indication of a precoding matrix within the codebook subset.   
     
     
         11 . The wireless communications system as in  claim 10 , wherein the indication is a PMI (precoding matrix index). 
     
     
         12 . The wireless communications system as in  claim 10 , wherein the CSI process is associated with a choice of a transmission points (TP) in a CoMP set. 
     
     
         13 . The wireless communications system as in  claim 12 , wherein the CoMP set comprises a CoMP measurement set. 
     
     
         14 . A user equipment (UE) used in network system that supports coordinated multipoint transmission and reception (CoMP), the user equipment (UE) comprising:
 a receiver to semi-statically receive a codebook subset for each channel state information (CSI) process,   wherein the UE is restricted to report an indication of a precoding matrix within the codebook subset.   
     
     
         15 . The user equipment (UE) as in  claim 14 , wherein the indication is a PMI (precoding matrix index). 
     
     
         16 . The user equipment (UE) as in  claim 14 , wherein the CSI process is associated with a choice of a transmission points (TP) in a CoMP set. 
     
     
         17 . The user equipment (UE) as in  claim 16 , wherein the CoMP set comprises a CoMP measurement set.