# US 2013/0155868 A1 · Method and apparatus for monitoring control channel in wireless communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0155868 A1 - Document ID: US20130155868A1 - Status: Published application - Kind: A1 - Application number: 13/521,014 - Filed: 2011-03-30 - Published: 2013-06-20 - Earliest claimed: 2010-03-30 - Assignees: LG Electronics Inc. - Inventors: Dongyoun Seo; Mingyu Kim; Suckchel Yang; Joonkui Ahn - Web page: https://patentgrep.com/patent/US20130155868A1 ## CPC - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H03M 13/3723: {using means or methods for the initialisation of the decoder} - H03M 13/6525: {3GPP LTE including E-UTRA} - H04J 11/0069: {Cell search, i.e. determining cell identity [cell-ID] (design of multiplexing codes H04J13/00; processing access restriction or access information H04W48/16; discovery of network devices for network data management H04W8/005; sounding signals for channel estimation H04L25/0226; structure of reference signals in multicarrier modulation systems H04L27/2613; frame, time or carrier synchronisation in multicarrier modulation systems H04L27/2655)} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H03M: CODING; DECODING; CODE CONVERSION IN GENERAL (using fluidic means F15C4/00; optical analogue/digital converters G02F7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C) - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) ## Abstract The present disclosure provides a method for monitoring a control channel in a wireless access system, including setting the number of maximum blind decoding times for each user equipment (UE)-specific search space and a common search space to which the control channel is transmitted; monitoring a plurality of candidate control channels in each of the search spaces, based on the number of maximum blind decoding times, set in the respective search spaces; and receiving downlink control information through a control channel which has succeeded in the blinding decoding among the plurality of candidate control channels, wherein the common search space is allocated to at least one carrier group that includes at least one component carrier. ## Claims ### Claim 1 A method for monitoring a control channel in a wireless access system, the method comprising: setting the number of maximum blind decoding times for each user equipment (UE)-specific search space and a common search space to which the control channel is transmitted; monitoring a plurality of candidate control channels in each of the search spaces, based on the number of maximum blind decoding times, set in the respective search spaces; and receiving downlink control information through a control channel which has succeeded in the blinding decoding among the plurality of candidate control channels, wherein the common search space is allocated to at least one carrier group that includes at least one component carrier. ### Claim 2 (depends on 1) The method of claim 1, wherein the monitoring includes performing blind decoding on the plurality of candidate control channels, and the performing of the blind decoding includes performing cyclic redundancy check (CRC) masking on each candidate control channel using a radio network temporary identifier (RNTI). ### Claim 3 (depends on 1) The method of claim 1, wherein the number of maximum blind decoding times in the common search space is set based on the number of the at least one carrier group. ### Claim 4 (depends on 1) The method of claim 1, wherein one common search space is allocated for each carrier group. ### Claim 5 (depends on 4) The method of claim 4, wherein the component carrier having the common search space allocated thereto is a primary component carrier or component carrier on which a physical uplink control channel (PUCCH) is transmitted. ### Claim 6 (depends on 1) The method of claim 1, wherein the at least one carrier group includes at least one component carrier having component carriers with the same frequency band, component carriers with different frequency bands, or a heterogeneous duplex structure or heterogeneous downlink-uplink (DL-UL) configuration. ### Claim 7 (depends on 1) The method of claim 1, wherein the number of maximum blind decoding times in the UE-specific search space is set based on the maximum bandwidth in which a UE simultaneously transmits/receives component carriers according to the capability of the UE. ### Claim 8 (depends on 7) The method of claim 7, wherein the number of maximum blind decoding times in the UE-specific search space is set based on the maximum number of component carriers which the UE transmits/receives according to the capability of the UE, the number of component carriers which the UE receives from a base station, or the number of activated component carriers among the received component carriers. ### Claim 9 (depends on 8) The method of claim 8, wherein the number of maximum blind decoding times in the UE-specific search space is allocated for each component carrier, and the number of blind decoding times, allocated for each component carrier, is determined based on the bandwidth of each component carrier transmitted to the base station or the number of component carriers which the UE receives from the base station. ### Claim 10 (depends on 9) The method of claim 9, wherein, when the number of maximum blind decoding times in the UE-specific search space is allocated for each component carrier based on the bandwidth of each component carrier, the lower limit of the number of blind decoding times for each component carrier is determined. ### Claim 11 (depends on 9) The method of claim 9, wherein the number of maximum blind decoding times for each component carrier is determined, and the number of maximum blind decoding times is set to that in a reference case. ### Claim 12 (depends on 10) The method of claim 10, wherein the lower limit is a value obtained by dividing the maximum number of component carriers which the UE transmits/receives according to the capability of the UE, the number of component carriers which the UE receives from a base station, or the number of activated component carriers among the received component carriers into the number of maximum blind decoding times in the UE-specific search space. ### Claim 13 (depends on 10) The method of claim 10, wherein the lower limit does not exceed the number of maximum blind decoding times in the reference case. ### Claim 14 (depends on 11) The method of claim 11, wherein the reference case is set so that the maximum transmit/receive bandwidth of the UE is 20 MHz, a single carrier is supported, and the number of maximum blind decoding times in the UE-specific search space is 48. ### Claim 15 (depends on 1) The method of claim 1, wherein the control channel is a physical downlink control channel (PDCCH). ### Claim 16 A UE for monitoring a control channel in a wireless access system, the UE comprising: a radio frequency (RF) unit for communicating a radio signal with an outside of the UE; and a control unit connected to the RF unit, wherein the control unit sets the number of maximum blind decoding times for each UE-specific search space and a common search space to which the control channel is transmitted, monitors a plurality of candidate control channels in each of the search spaces, based on the number of maximum blind decoding times, set in the respective search spaces, and receives downlink control information through a control channel which has succeeded in the blinding decoding among the plurality of candidate control channels, and wherein the common search space is allocated to at least one carrier group that includes at least one component carrier. ### Claim 17 (depends on 16) The UE of claim 16, wherein the control unit controls the UE so that the number of maximum blind decoding times in the common search space is set based on the number of the at least one carrier group, and one common search space is allocated for each carrier group. ### Claim 18 (depends on 17) The UE of claim 17, wherein the component carrier having the common search space allocated thereto is a primary component carrier or component carrier on which a PUCCH is transmitted. ### Claim 19 (depends on 16) The UE of claim 16, wherein the number of maximum blind decoding times in the UE-specific search space is set based on the maximum bandwidth in which the UE simultaneously transmits/receives component carriers according to the capability of the UE. ### Claim 20 (depends on 19) The UE of claim 19, wherein the control unit controls the UE so that the number of maximum blind decoding times in the UE-specific search space is set based on the maximum number of component carriers which the UE transmits/receives according to the capability of the UE, the number of component carriers which the UE receives from a base station, or the number of activated component carriers among the received component carriers. ### Claim 21 (depends on 16) The UE of claim 16, wherein the control unit controls the UE so that the number of maximum blind decoding times in the UE-specific search space is allocated for each component carrier, and the number of blind decoding times, allocated for each component carrier, is determined based on the bandwidth of each component carrier transmitted to the base station or the number of component carriers which the UE receives from the base station.