Transmission method and device for a downlink reference signal

A method of receiving reference signals for at least one antenna port by at a user equipment, the method comprising:

• receiving, by the user equipment from a base station, the reference signals for the at least one antenna port;
• and
• demodulating, by the user equipment, data for the at least one antenna port using the reference signals for the at least one antenna port,
• wherein the predetermined pattern includes a first group of resource elements and a second group of resource elements, wherein the first group and the second group have same positions in time domain and different positions in a frequency domain, and
• wherein, in case a number of antenna ports is more than four, reference signals for an additional antenna port are mapped to the first group or the second group in turns.

A base station for transmitting reference signals for at least one antenna port, comprising:

• a reception module;
• a transmission module;
• and
• a processor,
• wherein the processor is configured to:
• map the reference signals for the at least one antenna port to resource elements having a predetermined pattern in a subframe;
• and
• transmit, to a user equipment via the transmission module, the reference signals for the at least one antenna port,
• wherein the predetermined pattern includes a first group of resource elements and a second group of resource elements, wherein the first group and the second group have same positions in time domain and different positions in a frequency domain, and
• wherein, in case a number of antenna ports is more than four, reference signals for an additional antenna port are mapped to the first group or the second group in turns.

A user equipment for receiving reference signals for at least one antenna port, comprising:

• a reception module;
• a transmission module;
• and
• a processor,
• wherein the processor is configured to;
• receive, from a base station via the reception module, the reference signals for the at least one antenna port;
• and
• demodulate data for the at least one antenna port using the reference signals for the at least one antenna port,
• wherein the predetermined pattern includes a first group of resource elements and a second group of resource elements, wherein the first group and the second group have same positions in time domain and different positions in a frequency domain, and
• wherein, in case a number of antenna ports is more than four, reference signals for an additional antenna port are mapped to the first group or the second group in turns.