Method and apparatus for determining a precoding vector for precoding data to be transmitted to a wireless device in a wireless communication system

An apparatus for determining a precoding vector for precoding data to be transmitted to a wireless device in a wireless communication system, the apparatus comprising:

• a wireless receiver configured to receive a first channel state information of a channel between a first wireless device and a first base station in the wireless communication system, wherein the first channel state information is received by the first base station from the first wireless device;
• a wireline receiver configured to receive a first channel gain information of a channel between the second wireless device and the first base station, wherein the first channel gain information is received from a second base station, wherein the wireline receiver is configured to receive a first signal strength parameter from the second base station indicating a signal strength at the second wireless device caused by the second base station, wherein the wireline receiver is further configured to receive a first interference strength parameter from the second base station indicating an interference strength at the first wireless device caused by the second base station;
• and
• a processor configured to acquire a precoding vector for precoding data to be transmitted to the first wireless device by maximizing a common signal to interference noise ratio parameter, wherein the common signal to interference noise ratio parameter depends on a signal to interference noise ratio at the first wireless device and a signal to interference noise ratio at the second wireless device and is based on the first channel state information, the first channel gain information, the first signal strength parameter and the first interference strength parameter.

A computer program with a program code for performing the method for determining a precoding vector for precoding data to be transmitted to a wireless device in a wireless communication system, said method comprising:

• receiving first channel state information of a channel between a first wireless device and a first base station in the wireless communication system, wherein the first channel state information is received by the first base station from the first wireless device;
• receiving first channel gain information of a channel between a second wireless device and the first base station, wherein the first channel gain information is received from a second base station;
• receiving a first signal strength parameter from the second base station indicating a signal strength at the second wireless device caused by the second base station;
• receiving a first interference strength parameter from the second base station indicating an interference strength at the first wireless device caused by the second base station;
• and
• maximizing a common signal to interference noise ratio parameter to acquire a precoding vector for precoding data to be transmitted to the first wireless device, wherein the common signal to interference noise ratio parameter depends on a signal to interference noise ratio at the first wireless device and a signal to interference noise ratio at the second wireless device and is based on the first channel state information, the first channel gain information, the first signal strength parameter and the first interference strength parameter,
• when the computer program runs on a computer or a microcontroller.