Method and apparatus for transmitting and receiving codebook subset restriction bitmap

An evolved Node B (eNB) for transmitting a Codebook Subset Restriction (CSR) bitmap in transmission mode 9 for communication with 8 antenna ports, comprising:

• a controller for generating a CSR bitmap including bits corresponding to restricted precoding matrix indicators and rank indicators that are not allowed for reporting;
• and
• a communication unit for 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.

A Codebook Subset Restriction (CSR) bitmap reception method of a User Equipment (UE) in transmission mode 9 for communication with 8 antenna ports, the method comprising:

• receiving a CSR bitmap transmitted by an evolved Node B (eNB);
• and
• extracting, based on the CSR bitmap, restricted precoding matrix indicators and rank indicators that are not allowed for reporting,
• 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.

A User Equipment (UE) for receiving Codebook Subset Restriction (CSR) bitmap in transmission mode 9 for communication with 8 antenna ports, the UE comprising:

• a communication unit for receiving a CSR bitmap transmitted by an evolved Node B (eNB);
• and
• a controller for extracting, based on the CSR bitmap, restricted precoding matrix indicators and rank indicators that are not allowed for reporting,
• 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.