# US 9,439,135 B2 · Method and wireless device for monitoring control channel > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,439,135 B2 - Document ID: US9439135B2 - Status: Granted - Kind: B2 - Application number: 14/131,153 - Filed: 2012-07-18 - Published: 2014-05-29 - Granted: 2016-09-06 - Earliest claimed: 2011-07-18 - Assignees: LG Electronics Inc. - Applicants: Joon Kui Ahn; Suck Chel Yang; Dong Youn Seo; Han Byul Seo - Inventors: Joon Kui Ahn; Suck Chel Yang; Dong Youn Seo; Han Byul Seo - Web page: https://patentgrep.com/patent/US9439135B2 ## CPC - H04W 48/16: Discovering, processing access restriction or access information - H04B 7/04: using two or more spaced independent antennas - H04L 5/0023: {Time-frequency-space} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 24/00: Supervisory, monitoring or testing arrangements - H04W 72/20: Control channels or signalling for resource management - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Provided are a method of monitoring a control channel in a multiple antenna system, in which a plurality of layers are defined, and a wireless device using same. The wireless device monitors the control channel in a search layer that is selected from the plurality of layers. ## Claims ### Claim 1 A method of monitoring a physical control channel in a multiple antenna system, the method comprising: determining, by a wireless device, a search layer associated with an antenna used for the physical control channel among a plurality of search layers based on a pre-defined pattern, wherein the pre-defined pattern is determined based on a number of subframes carrying the physical control channel; and monitoring, by the wireless device, the physical control channel in the search layer, wherein the physical control channel is received via an orthogonal frequency division multiplexing (OFDM) symbol carrying a shared data channel, and the physical control channel includes scheduling information for the shared data channel, wherein the pre-defined pattern is determined by the wireless device without using control information received from a base station. ### Claim 2 (depends on 1) The method of claim 1, further comprising: receiving a reference signal used to demodulate the physical control channel in the search layer, wherein the reference signal is spread to a spreading sequence corresponding to the search layer. ### Claim 3 (depends on 2) The method of claim 2, wherein the reference signal is used to demodulate the shared data channel. ### Claim 4 (depends on 1) The method of claim 1, wherein a plurality of search spaces based on a plurality of aggregation levels are defined in the search layer. ### Claim 5 (depends on 1) The method of claim 1, wherein one search space based on one aggregation level is defined in the search layer. ### Claim 6 (depends on 1) The method of claim 1, wherein a first search layer determined for a first subframe is different from a second search layer determined for a second subframe, which directly follows the first subframe. ### Claim 7 A wireless device for monitoring a physical control channel in a multiple antenna system, the wireless device comprising: a radio frequency (RF) unit configured to transmit and receive a radio signal; and a processor operatively coupled to the RF unit, the processor being configured to: determine a search layer associated with an antenna used for the physical control channel among a plurality of search layers based on a pre-defined pattern, wherein the pre-defined pattern is determined based on a number of subframes carrying the physical control channel, and monitor the physical control channel in the search layer, wherein the physical control channel is received via an orthogonal frequency division multiplexing (OFDM) symbol carrying a shared data channel, and the physical control channel includes scheduling information for the shared data channel, wherein the pre-defined pattern is determined by the processor without using control information received from a base station. ### Claim 8 (depends on 7) The wireless device of claim 7, wherein the processor receives a reference signal used to demodulate the physical control channel in the search layer, and wherein the reference signal is spread to a spreading sequence corresponding to the search layer. ### Claim 9 (depends on 8) The wireless device of claim 8, wherein the reference signal is used to demodulate the shared data channel. ### Claim 10 (depends on 7) The wireless device of claim 7, wherein a plurality of search spaces based on a plurality of aggregation levels are defined in the search layer. ### Claim 11 (depends on 7) The wireless device of claim 7, wherein one search space based on one aggregation level is defined in the search layer. ### Claim 12 (depends on 7) The wireless device of claim 7, wherein a first search layer determined for a first subframe is different from a second search layer determined for a second subframe, which directly follows the first subframe.