Patent ID: 9698955
Date: 2017-07-04
CPC Classifications: H04L

Claim:
1. A method for transmitting a downlink control channel via one or more resource blocks, the one or more resource blocks consisting of resource elements (REs) reserved for carrying a demodulation reference signal (DMRS) for all antenna ports and other REs, the method performed by a base station in a wireless communication system and comprising: transmitting to a user equipment the downlink control channel using one or more resource allocation groups among a plurality of resource allocation groups to a user equipment, wherein the plurality of resource allocation groups are configured for the downlink control channel using a predetermined number of RE subsets, wherein the predetermined number of RE subsets are only defined from the other REs and exclude only the REs reserved for carrying the DMRS for all of the antenna ports, based on an assumption that any RE reserved for a Cell specific Reference Signal (CRS) or any RE reserved for a Channel Status Information Reference Signal (CSI-RS) does not exist, wherein each of the resource blocks includes REs each defined by a symbol index and a subcarrier index, wherein the other REs are allocated sequentially to the predetermined number of RE subsets in an order of subcarrier indexes in each of the one or more resource blocks, and wherein if all REs defined by one symbol index are allocated, the other REs are allocated sequentially to the predetermined number of RE subsets in an order of subcarrier indexes by a next symbol index.