Patent ID: 8913674

Claim:
A Codebook Subset Restriction (CSR) bitmap transmission method of an evolved Node B (eNB) in transmission mode 9 for communication with 8 antenna ports, the method comprising: generating a CSR bitmap including bits corresponding to restricted precoding matrix indicators and rank indicators that are not allowed for reporting; and transmitting the CSR bitmap to a User Equipment (UE), wherein the CSR bitmap comprises 53 bits corresponding to a first precoding matrix indicator and 56 bits corresponding to a second precoding matrix indicator, wherein the 53 bits corresponding to the first precoding matrix indicator consist of 16, 16, 4, 4, 4, 4, 4 and 1 bits for layers 1, 2, 3, 4, 5, 6, 7, and 8, respectively, wherein the 56 bits corresponding to the second precoding matrix indicator consist of 16, 16, 16 and 8 bits for layers 1, 2, 3, and 4, respectively, and wherein the CSR bitmap does not include bits corresponding to the second precoding matrix indicator for layers 5, 6, 7, and 8.