Patent ID: 9219587
Filing Date: 2015-12-22
Classification: H04B,H04J,H04L,H04W

Abstract:
1. A method for transmitting, by a user equipment (UE), a demodulation reference signal (DMRS) for a physical uplink shared channel (PUSCH) in a wireless communication system, the method comprising: receiving a cyclic shift field through a physical downlink control channel (PDCCH) from a base station, wherein the cyclic shift field indicates first, second, third and fourth cyclic shifts; generating a first DMRS sequence, which is associated with a first layer, by using the first cyclic shift; generating a second DMRS sequence, which is associated with a second layer, by using the second cyclic shift; generating a third DMRS sequence, which is associated with a third layer, by using the third cyclic shift, wherein the third DMRS sequenced mapped in a second slot among two slots is multiplied with −1; generating a fourth DMRS sequence, which is associated with a fourth layer, by using the fourth cyclic shift, wherein the fourth DMRS sequenced mapped in the second slot among the two slots is multiplied with −1; and transmitting the first, second, third and fourth DMRS sequences to the base station, wherein the first and second cyclic shifts are separated by a maximum value corresponding to a total number of possible cyclic shifts, and wherein the third and fourth cyclic shifts are separated by the maximum value corresponding to the total number of possible cyclic shifts.