Patent ID: 9565665
Date: 2017-02-07
CPC Classifications: H04L,H04W

Claim:
1. A method for transmitting a downlink control channel at a base station in a wireless communication system, the method comprising: determining a number of usable resource elements for the downlink control channel in a data region of a resource block pair, based on a number of symbols of the data region of the resource block pair and 24 pre-configured resource elements for candidate of a demodulation reference signal (DMRS); determining a size of a resource allocation unit for the downlink control channel and determining a number of resource allocation units within the data region of the resource block pair, based on the determined number of usable resource elements in the data region of the resource block pair; allocating all of the 24 pre-configured resource elements to the DMRS, when the number of resource allocation units is determined to be 4; allocating 12 resource elements of the 24 pre-configured resource elements to the DMRS and 12 remaining resource elements to one or more of the resource allocation units when the number of resource allocation units is less than 4; mapping the downlink control channel to a transmission resource within a predetermined number of resource block pairs, in accordance with the determined number of resource allocation units and allocated resource elements for each of the resource allocation units; and transmitting the downlink control channel to a user equipment by using one or more antennas according to a result of the mapping of the downlink control channel, wherein the determined size of the resource allocation unit varies in accordance with the determined number of usable resource elements.