Patent ID: 9467264
Filing Date: 2016-10-11
CPC Classification: H04L,H04W

Claim Text:
1. A method of transmitting a downlink control channel to a user equipment by a base station in a wireless communication system, the method comprising: configuring resource element subsets comprised of a plurality of resource elements; allocating transmission resources for the downlink control channel in a unit of the resource element subset; allocating two antenna ports for a demodulation-reference signal (DM-RS) to the plurality of the resource elements alternatively; and transmitting the downlink control channel through the transmission resources using the DM-RS of the allocated two antenna ports, wherein a first index of the allocated two antenna ports is a fixed value, wherein a second index of the allocated two antenna ports is determined based on which cyclic prefix is applied to a subframe on which the downlink control channel is transmitted among a normal cyclic prefix and an extended cyclic prefix, wherein if the downlink control channel is transmitted on a subframe with the normal cyclic prefix, the allocated two antenna ports are not multiplexed to same resource elements, and wherein if the downlink control channel is transmitted on a subframe with the extended cyclic prefix, the allocated two antenna ports are multiplexed to same resource elements.