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The present invention relates to a wireless communication system. In particular, the present invention relates to a method for handling physical downlink control channels (PDCCHs) in a user equipment, the method comprising: receiving a plurality of control channel elements (CCEs) from a base station; performing blind decoding of the plurality of CCEs in CCE aggregation units; and identifying a CCE aggregation level used for the PDCCH transmission, on the basis of the blinding decoding result, wherein the CCE aggregation level is relevant resource mapping of the control information included in the PDCCH.

Titel:	Method and apparatus for resolving the confusion in CCES
Autor/in / Beteiligte Person:	Han, Seung Hee ; Kwon, Yeong Hyeon ; Chung, Jae Hoon ; Lee, Moon Il
Link:	View record in USPTO Patent Grants (Volltext)
Veröffentlichung:	2016
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Grants Sprachen: English Patent Number: 9,479,309 Publication Date: October 25, 2016 Appl. No: 13/578986 Application Filed: February 01, 2011 Assignees: LG ELECTRONICS INC. (Seoul, KR) Claim: 1. A method for receiving a physical downlink control channel (PDCCH) signal at a user equipment (UE) in a wireless communication system, the method comprising: Receiving, by the UE, a subframe including a plurality of search spaces in a carrier, wherein each search space is for a respective one of a number of control channel element (CCE) aggregation levels; Monitoring, by the UE, PDCCH candidates in a search space of a respective CCE aggregation level to receive the PDCCH signal; and Performing, by the UE, a procedure for receiving or transmitting a physical shared channel signal based on successful reception of the PDCCH signal, wherein a CCE position of the search space of the respective CCE aggregation level in the carrier is calculated based on a value of a carrier indicator field (CIF). Claim: 2. The method of claim 1 , wherein the monitoring the PDCCH candidates includes decoding the PDCCH candidates. Claim: 3. The method of claim 1 , wherein the PDCCH signal indicates a physical downlink shared channel (PDSCH) signal, and if a CCE aggregation level of the PDCCH signal is 1, a single physical uplink control channel (PUCCH) resource is allocated based on a lowest CCE index of the PDCCH signal, and if the CCE aggregation level of the PDCCH signal is 2 or higher, a plurality of PUCCH resources is allocated based on the lowest CCE index of the PDCCH signal. Claim: 4. The method of claim 3 , wherein the plurality of PUCCH resources is orthogonal to each other. Claim: 5. The method of claim 4 , wherein a first one of the plurality of PUCCH resources is determined based on the lowest CCE index of the PDCCH signal, and a second one of the plurality of PUCCH resources is determined based on a sum of an offset and the lowest CCE index of the PDCCH signal. Claim: 6. A user equipment (UE) for receiving a physical downlink control channel (PDCCH) signal in a wireless communication system, the UE comprising: a radio frequency (RF) unit; and a processor, wherein the processor is configured to: receive a subframe including a plurality of search spaces in a carrier, wherein each search space is for a respective one of a number of control channel element (CCE) aggregation levels, monitor PDCCH candidates in a search space of a respective CCE aggregation level to receive the PDCCH signal, and perform a procedure for receiving or transmitting a physical shared channel signal based on successful reception of the PDCCH signal, wherein a CCE position of the search space of the respective CCE aggregation level in the carrier is calculated based on a value of a carrier indicator field (CIF). Claim: 7. The UE of claim 6 , wherein the monitoring the PDCCH candidates includes decoding the PDCCH candidates. Claim: 8. The UE of claim 6 , wherein the PDCCH signal indicates a physical downlink shared channel (PDSCH) signal, and if a CCE aggregation level of the PDCCH signal is 1, a single physical uplink control channel (PUCCH) resource is allocated based on a lowest CCE index of the PDCCH signal, and if the CCE aggregation level of the PDCCH signal is 2 or higher, a plurality of PUCCH resources is allocated based on the lowest CCE index of the PDCCH signal. Claim: 9. The UE of claim 8 , wherein the plurality of PUCCH resources is orthogonal to each other. Claim: 10. The UE of claim 8 , wherein a first one of the plurality of PUCCH resources is determined based on the lowest CCE index of the PDCCH signal, and a second one of the plurality of PUCCH resources is determined based on a sum of an offset and the lowest CCE index of the PDCCH signal. Patent References Cited: 8463262 June 2013 Kwon et al. ; 2009/0088148 April 2009 Chung et al. ; 2009/0257449 October 2009 Chen et al. ; 2009/0274109 November 2009 Zhang et al. ; 2010/0215011 August 2010 Pan et al. ; 2010/0291937 November 2010 Hu et al. ; 2011/0205978 August 2011 Nory et al. ; 2012/0093104 April 2012 Tiirola et al. ; 10-2009-0083269 August 2009 ; WO 2009/041779 April 2009 ; WO 2009/058905 May 2009 Other References: 3GPP TS 36.213 version 10.1.0 Release 10: “LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures”, European Telecommunications Standards Institute 2011, pp. 23, 25, 84-85. cited by examiner ; International Search Report from PCT/KR2011/000714, dated Oct. 13, 2011. cited by applicant Primary Examiner: Harper, Kevin C Attorney, Agent or Firm: Dentons US LLP

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Method and apparatus for resolving the confusion in CCES