Apparatus and method for transmitting and receiving of cyclic shift parameter for supporting orthogonality in mimo environment

A method of transmitting a Cyclic Shift (CS) parameter from an evolved NodeB (eNodeB) to a User Equipment (UE) that generates reference signals for multiple layers, the method comprising:

• setting 011 or 100 as the CS parameter, the 011 CS parameter or the 100 CS parameter indicating a first Orthogonal Cover Code (OCC) for each of N layers of the UE, or
• setting 101 or 110 as the CS parameter, the 101 CS parameter or the 110 CS parameter indicating a second OCC for each of the N layers of the UE;
• and
• transmitting the CS parameter to the UE,
• wherein the 011 CS parameter indicates 4 as a CS parameter value of a first layer of the N layers, the 100 CS parameter indicates 2 as the CS parameter value of the first layer, the 101 CS parameter indicates 8 as the CS parameter value of the first layer, and the 110 CS parameter indicates 10 as the CS parameter value of the first layer, and
• wherein the CS parameter is a 3-bit value, and N is 2 or 4.

A User Equipment (UE) to generate reference signals for multiple layers, the UE comprising:

• a transceiver to receive a Cyclic Shift (CS) parameter from an evolved NodeB (eNodeB), the CS parameter comprising a 3-bit value;
• and
• a processor to generate the reference signals for N layers based on the 3-bit value,
• wherein the transceiver transmits the generated reference signals to the eNodeB,
• wherein N is 2 or 4,
• wherein the processor applies a first Orthogonal Cover Code (OCC) for each of the N layers in response to a determination that the CS parameter is one of 011 indicating 4 as a CS parameter value of a first layer of the N layers and 100 indicating 2 as the CS parameter value of the first layer, and
• wherein the processor applies a second OCC for each of the N layers in response to a determination that the CS parameter is one of 101 indicating 8 as the CS parameter value of the first layer and 110 indicating 10 as the CS parameter value of the first layer.

An evolved NodeB (eNodeB) to transmit a Cyclic Shift (CS) parameter to a User Equipment (UE) that generates reference signals for multiple layers, the eNodeB comprising:

• a processor to set 011 or 100 as the CS parameter or to set 101 or 110 as the CS parameter, the 011 CS parameter or the 100 CS parameter indicating a first Orthogonal Cover Code (OCC) for each of N layers of the UE, and the 101 CS parameter or the 110 CS parameter indicating a second OCC for each of the N layers of the UE;
• and
• a transceiver to transmit the CS parameter to the UE,
• wherein the 011 CS parameter indicates 4 as a CS parameter value of a first layer of the N layers, the 100 CS parameter indicates 2 as the CS parameter value of the first layer, the 101 CS parameter indicates 8 as the CS parameter value of the first layer, and the 110 CS parameter indicates 10 as the CS parameter value of the first layer, and
• wherein the CS parameter is a 3-bit value, and N is 2 or 4.