Patent ID: 8982865
Filing Date: 2015-03-17
Classification: H04J,H04L,H04W

Abstract:
1. A method for transmitting downlink data demodulation reference signals in a radio mobile communication system, comprising: generating, by a base station, a subframe including data and the data demodulation reference signals; and transmitting, by the base station to a user equipment, the generated subframe, wherein the data demodulation reference signals are used by the user equipment to demodulate the data, wherein the data demodulation reference signals are mapped to resource elements of the subframe according to demodulation reference signal patterns, wherein the demodulation reference signal patterns are grouped as: wherein the first demodulation reference signal pattern group and the second demodulation reference signal pattern group are distinguished from each other in a time-frequency resource, wherein, if a rank is N: wherein: