A Scalable Method for Obtaining UE-Specific CSI

A method performed by a wireless node for transmitting reference symbols, the wireless node comprising an antenna with a plurality of antenna ports, the method comprising:

• configuring channel state information (CSI) measurements of a user equipment (UE) by transmitting a downlink message;
• transmitting a first reference symbol using the plurality of antenna ports, wherein the first reference symbol is transmitted using a first number (N) of antenna ports;
• and
• transmitting a second reference symbol using the plurality of antenna ports, wherein the second reference symbol is transmitted using a second number (K) of antenna ports, wherein:
• the first reference symbol is transmitted using a first port distance smaller than a second port distance used to transmit the second reference symbol, and
• K is less than N.

A wireless node configured to transmit reference symbols, the wireless node comprising:

• an antenna with a plurality of antenna ports;
• a processor operably coupled to the antenna;
• and
• a memory containing instructions executable by said processor, wherein execution of the instructions configures the wireless node to:
• configure channel state information (CSI) measurements of a user equipment (UE) by transmitting a downlink message;
• transmit a first reference symbol using the plurality of antenna ports, wherein the first reference symbol is transmitted using a first number (N) of antenna ports;
• and
• transmit a second reference symbol using the plurality of antenna ports, wherein the second reference symbol is transmitted using a second number (K) of antenna ports, wherein:
• the first reference symbol is transmitted using a first port distance smaller than a second port distance used to transmit the second reference symbol, and
• K is less than N.