Method of mapping transmission layers to frequency division multiplexed demodulation reference signal ports

A method for mapping mobile communication devices to demodulation reference signal (DMRS) antenna ports, the method comprising:

• determining a number of the mobile communication devices to be assigned to a plurality of DMRS antenna ports;
• sorting the plurality of DMRS antenna ports in ascending order based on a channel estimation mean square error (MSE);
• sorting the number of the mobile communication devices in descending order of a downlink (DL) spectral efficiency (SE);
• and
• assigning the number of the mobile communication devices to the plurality of DMRS antenna ports in descending order of the DL SE and ascending order of the channel estimation MSE.

A non-transitory computer readable medium having stored thereon instructions for causing one or more processors to perform operations comprising:

• determining a number of mobile communication devices to be assigned to a plurality of DMRS antenna ports;
• sorting the plurality of DMRS antenna ports in ascending order based on a channel estimation mean square error (MSE);
• sorting the number of mobile communication devices in descending order of a downlink (DL) spectral efficiency (SE);
• and
• assigning the number of mobile communication devices to the plurality of DMRS antenna ports in descending order of the DL SE and ascending order of the channel estimation MSE.

An apparatus for mapping transmission layers to demodulation reference signal (DMRS) antenna ports, the apparatus comprising:

• means for determining a number of transmission layers to be transmitted;
• means for sorting a plurality of DMRS antenna ports in ascending order based on a channel estimation mean square error (MSE);
• and
• means for assigning the number of transmission layers to the plurality of DMRS antenna ports in ascending order of the channel estimation MSE.

An apparatus for mapping mobile communication devices to demodulation reference signal (DMRS) antenna ports, the method comprising:

• means for determining a number of the mobile communication devices to be assigned to a plurality of DMRS antenna ports;
• means for sorting the plurality of DMRS antenna ports in ascending order based on a channel estimation mean square error (MSE);
• means for sorting the number of the mobile communication devices in descending order of a downlink (DL) spectral efficiency (SE);
• and
• means for assigning the number of the mobile communication devices to the plurality of DMRS antenna ports in descending order of the DL SE and ascending order of the channel estimation MSE.