Precoding matrix set determining method and apparatus, and parameter indication information sending method and apparatus

Abstract

A precoding matrix set determining method and apparatus, and a parameter indication information sending method and apparatus are provided. The precoding matrix set determining method includes: determining, by a first network device, a parameter used for determining a precoding matrix set, where the parameter includes at least one of a phase parameter, an amplitude parameter, a quantity of vectors in the precoding matrix set, a quantity of vectors in a first codebook set in dual-codebook feedback, and a quantity of vectors in a second codebook set in the dual-codebook feedback, and the parameter is not fixed; and using the parameter to determine the precoding matrix set, where the precoding matrix set includes at least one precoding matrix. By using this solution, flexibility of feeding back a precoding matrix indicator is improved.

What is claimed is: 
     
         1 . A precoding matrix set determining method comprising:
 determining, by a first network device, a parameter used for determining a precoding matrix set for use by a transmitter of the first network device, wherein the parameter comprises at least one of a phase interval, an amplitude a m,n  of an element (m, n) in the precoding matrix set, a quantity of vectors in the precoding matrix set, a quantity of vectors in a first codebook set in dual-codebook feedback, and a quantity of vectors in a second codebook set in the dual-codebook feedback, wherein the parameter is first network device-specific; and   determining the precoding matrix set by using the parameter, wherein the precoding matrix set comprises at least one precoding matrix.   
     
     
         2 . The method according to  claim 1 , wherein the parameter comprises multiple groups of parameters used for determining different precoding matrix subsets and determining the precoding matrix set by using the parameter comprises:
 separately determining respective precoding matrix subsets by using the groups of parameters; and   forming the precoding matrix set by using the precoding matrix subsets separately determined for the groups of parameters.   
     
     
         3 . The method according to  claim 1 , wherein:
 for a dual-codebook structure, W=W1*W2,   
       
         
           
             
               
                 
                   W 
                    
                   
                       
                   
                    
                   1 
                 
                 = 
                 
                   [ 
                   
                     
                       
                         U 
                       
                       
                         0 
                       
                     
                     
                       
                         0 
                       
                       
                         U 
                       
                     
                   
                   ] 
                 
               
               , 
             
           
         
          W1 is a diagonal matrix, each U in W1 is a precoding matrix subset, each U is corresponding to a group of parameters, and U corresponding to the group of parameters is determined according to the group of parameters. 
       
     
     
         4 . The method according to  claim 1 , wherein the determining, by a first network device, a parameter used for determining a precoding matrix set comprises:
 receiving, by the first network device, first parameter indication information sent by a second network device, wherein the first parameter indication information is used to indicate the parameter used for determining the precoding matrix set; and   determining, according to the first parameter indication information, the parameter used for determining the precoding matrix set.   
     
     
         5 . The method according to  claim 4 , wherein the first parameter indication information is sent by radio resource control RRC signaling. 
     
     
         6 . A parameter indication information sending method comprising:
 determining, by a second network device, a parameter used for determining a precoding matrix set for use by a transmitter of a first network device,
 wherein the parameter comprises at least one of a quantity of vectors in the precoding matrix set, a quantity of vectors in a first codebook set in dual-codebook feedback, and a quantity of vectors in a second codebook set in the dual-codebook feedback, and the parameter is not fixed; and 
   sending first parameter indication information to a first network device, wherein the first parameter indication information is used to indicate the parameter and the parameter is first network device-specific.   
     
     
         7 . The method according to  claim 6 , wherein the parameter comprises multiple groups of parameters used for determining different precoding matrix subsets; and the precoding matrix subsets separately determined for the groups of parameters form the precoding matrix set. 
     
     
         8 . The method according to  claim 6 , wherein:
 for a dual-codebook structure, W=W1*W2,   
       
         
           
             
               
                 
                   W 
                    
                   
                       
                   
                    
                   1 
                 
                 = 
                 
                   [ 
                   
                     
                       
                         U 
                       
                       
                         0 
                       
                     
                     
                       
                         0 
                       
                       
                         U 
                       
                     
                   
                   ] 
                 
               
               , 
             
           
         
          W1 is a diagonal matrix, each U in W1 is a precoding matrix subset, each U is corresponding to a group of parameters, and U corresponding to the group of parameters is determined according to the group of parameters. 
       
     
     
         9 . The method according to  claim 6 , wherein sending first parameter indication information to the first network device comprises:
 sending the first parameter indication information to the first network device by radio resource control RRC signaling.   
     
     
         10 . A precoding matrix set determining apparatus comprising:
 at least one processor; and   a memory that stores an execution instruction and, when the processor executes the execution instruction, the processor is configured to perform the following operations:
 determining a parameter used for determining a precoding matrix set for use by a transmitter of a first network device,
 wherein the parameter comprises at least one of a phase interval, an amplitude a m,n  of an element (m, n) in the precoding matrix set, a quantity of vectors in the precoding matrix set, a quantity of vectors in a first codebook set in dual-codebook feedback, and a quantity of vectors in a second codebook set in the dual-codebook feedback, wherein the parameter is first network device-specific; and 
 
 determining the precoding matrix set by using the parameter, wherein the precoding matrix set comprises at least one precoding matrix. 
   
     
     
         11 . The apparatus according to  claim 10 , wherein the parameter comprises multiple groups of parameters used for determining different precoding matrix subsets, and determining the precoding matrix set by using the parameter comprises:
 separately determining respective precoding matrix subsets by using the groups of parameters; and   forming the precoding matrix set by using the precoding matrix subsets separately determined for the groups of parameters.   
     
     
         12 . The apparatus according to  claim 10 , wherein:
 for a dual-codebook structure, W=W1*W2,   
       
         
           
             
               
                 
                   W 
                    
                   
                       
                   
                    
                   1 
                 
                 = 
                 
                   [ 
                   
                     
                       
                         U 
                       
                       
                         0 
                       
                     
                     
                       
                         0 
                       
                       
                         U 
                       
                     
                   
                   ] 
                 
               
               , 
             
           
         
          W1 is a diagonal matrix, each U in W1 is a precoding matrix subset, each U is corresponding to a group of parameters, and U corresponding to the group of parameters is determined according to the group of parameters. 
       
     
     
         13 . The apparatus according to  claim 10 , wherein determining, by the first network device, the parameter used for determining the precoding matrix set comprises:
 receiving, by the first network device, first parameter indication information sent by a second network device, wherein the first parameter indication information is used to indicate the parameter used for determining the precoding matrix set; and   determining, according to the first parameter indication information, the parameter used for determining the precoding matrix set.   
     
     
         14 . The apparatus according to  claim 13 , wherein the first parameter indication information is sent by radio resource control RRC signaling. 
     
     
         15 . A parameter indication information sending apparatus comprising:
 at least one processor; and   a memory that stores an execution instruction and, when the processor executes the execution instruction, the processor is configured to perform the following operations:
 determining a parameter used for determining a precoding matrix set for use by a transmitter of a first network device,
 wherein the parameter comprises at least one of a quantity of vectors in the precoding matrix set, a quantity of vectors in a first codebook set in dual-codebook feedback, and a quantity of vectors in a second codebook set in the dual-codebook feedback, and the parameter is not fixed; and 
 
 sending first parameter indication information to a first network device, wherein the first parameter indication information is used to indicate the parameter and the parameter is first network device-specific.