Patent ID: 8908811

Claim:
A method for acquiring channel state information comprising: a user equipment (UE) reporting codebook index information and information about a total number of layers to an eNode B (eNB), wherein the codebook index information comprises class 1 codebook index i and index parameter j; and after receiving the codebook index information and the information about the total number of layers sent by the UE, the eNB obtaining the codeword by inquiring of the preset codebook list using the class 1 codebook index I, index parameter j, and the total number of layers υ as an index, with the preset codebook list including a table 1; wherein as to table 1, if a class 1 codebook index I, and index parameter j and a total number of layers υ are given, a unique complex matrix CMat ij v will be directly given, wherein i=0,1, . . . , 2 NB 1 , j=0,1, . . . , 2 NB 2 , CMat ij v represents a codeword of a class 2 codebook and is a complex matrix, NB 1 and NB 2 are positive integral numbers greater than 0 and respectively represent the size of the class 1 codebook and that of the class 2 codebook, wherein CMat ij v is a N T ×1 matrix or a N T ×2 matrix; and N T represents a number of antenna ports of the eNB.