Patent ID: 8902849
Filing Date: 2014-12-02
Classification: H04B,H04L,H04W

Abstract:
1. A method of transmitting a demodulation reference signal (DMRS) for a physical uplink shared channel (PUSCH) by a device in a wireless communication system, the method comprising: generating, by the device, a first, second and third DMRS sequence respectively associated with a first, second and third layer of a plurality of layers, wherein a first, second and third cyclic shift is allocated to the first, second and third DMRS sequences, respectively; mapping, by the device, the first, second and third DMRS sequences to a set of resource elements (REs) of single carrier frequency division multiple access (SC-FDMA) symbols and subcarriers to form a first, second and third DMRS, respectively; and transmitting the first, second and third DMRSs to a base station, wherein the first, second and third cyclic shifts allocated to the first, second and third DMRS sequence are determined respectively based on a first parameter n, a second parameter n, and a third parameter n, the first, second and third parameters n being indicated by a common cyclic shift field received through a physical downlink control channel (PDCCH), wherein the first and second parameters n are separated by a maximum value corresponding to a total number of possible cyclic shifts, and wherein the third parameter n is separated from each of the first and second parameters n by a medium value between the first and second parameters n.