Codebook construction
AssigneeNEC Corporation
InventorsNarayan PRASAD, Guosen YUE, Mohammad KHOJASTEPOUR, Sampath RANGARAJAN
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Abstract
A method implemented in a base station used in a wireless communications system is disclosed. The method comprises having 1-layer, 2-layer, 3-layer, and 4-layer codebooks for 4 transmit antenna (4TX) transmission, each codebook including a plurality of precoding matrices, precoding data with one of the plurality of precoding matrices, and transmitting, to a user equipment, the precoded data, wherein each of the 1-layer and 2-layer codebooks comprises a first codebook and a second codebook, and wherein each precoding matrix in the first codebook comprises a first index and a second index. Other apparatuses, systems, and methods also are disclosed.
Claims29
1-18. (canceled)
A base station comprising:
- a reception interface configured to receive, from a user equipment (UE), a first parameter related to precoding matrix indicator (PMI), and a second parameter related to rank indicator (RI);
- a transmission interface configured to transmit, to the UE, a data which the data is precoded by using one of plurality of precoding matrices, based on the first parameter and the second parameter;
- wherein the transmission interface comprises 4 transmit antenna (4TX);
- wherein the plurality of precoding matrices comprise a first 1-layer, a second 1-layer, a first 2-layer, a second 2-layer, 3-layer, and 4-layer codebooks for 4TX transmission, which each precoding matrix in the first 1-layer and the first 2-layer codebooks comprises a first index and a second index.
A communication method by a base station having 4 transmit antenna (4TX), the communication method comprising:
- receiving, from a user equipment (UE), a first parameter related to precoding matrix indicator (PMI), and a second parameter related to rank indicator (RI);
- transmitting, to the UE, a data which the data is precoded by using one of plurality of precoding matrices, based on the first parameter and the second parameter;
- wherein the plurality of precoding matrices comprise a first 1-layer, a second 1-layer, a first 2-layer, a second 2-layer, 3-layer, and 4-layer codebooks for 4TX transmission, which each precoding matrix in the first 1-layer and the first 2-layer codebooks comprises a first index and a second index.
A user equipment (UE) comprising:
- a reception interface configured to receive, from a base station, a reference signal;
- a transmission interface configured to transmit, to the base station comprising 4 transmission antenna (4TX), a first parameter and a second parameter being determined based on channel information estimated from the reference signal, which the first parameter is related to precoding matrix indicator (PMI) and the second parameter is related to rank indicator (RI);
- wherein the first parameter and the second parameter indicate one of plurality of precoding matrices, which the plurality of precoding matrices comprise a first 1-layer, a second 1-layer, a first 2-layer, a second 2-layer, 3-layer, and 4-layer codebooks for 4TX transmission, which each precoding matrix in the first 1-layer and the first 2-layer codebooks comprises a first index and a second index.
A communication method by a user equipment (UE), the communication method comprising:
- receiving, from a base station comprising, a reference signal;
- transmitting, to the base station comprising 4 transmission antenna (4TX), a first parameter and a second parameter being determined based on channel information estimated from the reference signal, which the first parameter is related to precoding matrix indicator (PMI) and the second parameter is related to rank indicator (RI);
- wherein the first parameter and the second parameter indicate one of plurality of precoding matrices, which the plurality of precoding matrices comprise a first 1-layer, a second 1-layer, a first 2-layer, a second 2-layer, 3-layer, and 4-layer codebooks for 4TX transmission, which each precoding matrix in the first 1-layer and the first 2-layer codebooks comprises a first index and a second index.
Dependencies are inferred from the claim text.