Method whereby user equipment receives downlink control information in wireless communication system, and device therefor

• US 10,448,412 B2
• Filed: 01/12/2016
• Issued: 10/15/2019
• Est. Priority Date: 01/12/2015
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Seungmin, Yang, Suckchel, Ahn, Joonkui, Kim, Seonwook
• Primary Examiner(s): Behnamian, Shahriar
• Application Number:
  US15/543,197
• Publication Number:
  US 20170374653A1
• Time in Patent Office: 1,372 Days
• Field of Search: 455450
• CPC Class Codes: H04J 11/0073 Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 1/0038 Blind format detection for detection of modulation format H04L27/0012
• CPC Class Codes: H04L 1/0045 Arrangements at the receiver end
• CPC Class Codes: H04L 1/0046 Code rate detection or code type detection H04L1/0038 takes precedence; detection of the data rate H04L25/0262; for packet format H04L1/0091
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 5/00 Arrangements affording multiple use of the transmission path
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 36/0079 in case of hand-off failure or rejection
• CPC Class Codes: H04W 36/0088 Scheduling hand-off measurements
• CPC Class Codes: H04W 36/305 Handover due to radio link failure control signalling for hand-off failure H04W36/0079
• CPC Class Codes: H04W 48/10 using broadcasted information
• CPC Class Codes: H04W 48/12 : using downlink control channel
• CPC Class Codes: H04W 48/16 : Discovering, processing access restriction or access information
• CPC Class Codes: H04W 72/21 : in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 : in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/542 : using measured or perceived quality
• CPC Class Codes: H04W 76/27 : Transitions between radio resource control [RRC] states

Abstract

Provided are a method whereby user equipment (UE) receives downlink control information in a wireless communication system and UE using the method. The method comprises: receiving configuration information (MUCC-DCI configuration information) on multi-carrier downlink control information (MUCC-DCI) that may include pieces of scheduling information related to multiple serving cells; and performing blind decoding (BD) on the MUCC-DCI in a shared search space (shared SS) determined on the basis of the MUCC-DCI configuration information.

Claims

1. A method for receiving downlink control information (DCI) by a user equipment (UE) in a wireless communication system, the method comprising:

receiving at least one of single-carrier downlink control information (SICC-DCI) which schedules only one serving cell or multi-carrier downlink control information (MUCC-DCI) which simultaneously schedules multiple serving cells in a subframe; and

blind-decoding the at least one of the SICC-DCI or the MUCC-DCI,

wherein the SICC-DCI is received in a physical downlink control channel (PDCCH) region located at first N (N is a natural number) orthogonal frequency division multiplexing (OFDM) symbols of the subframe,

wherein the MUCC-DCI is received in an enhanced PDCCH (EPDCCH) region located at OFDM symbols following the first N OFDM symbols of the subframe,

wherein, when the UE receives both the SICC-DCI and the MUCC-DCI in the subframe, the UE discards the SICC-DCI and regards the MUCC-DCI as valid.

2. The method of claim 1, wherein the MUCC-DCI and the SICC-DCI are configured to have the same bit size.

3. The method of claim 1, wherein the UE blind-decodes only MUCC-DCI on a shared search space (SS).

4. The method of claim 1, wherein the UE blind-decodes the SICC-DCI in a shared search space (SS) in the PDCCH region.

5. The method of claim 1, wherein aggregation level (AL) candidates when the MUCC-DCI is blind-decoded and AL candidates when the SICC-DCI is blind-decoded are configured to be different from each other.

6. The method of claim 5, wherein the number of times of blind decoding in each AL when the MUCC-DCI is blind-decoded and the number of times of blind decoding in each AL when the SICC-DCI is blind-decoded are configured to be different.

7. The method of claim 1, wherein the MUCC-DCI includes only downlink grant as downlink scheduling information.

8. The method of claim 1, wherein the MUCC-DCI includes only uplink grant as uplink scheduling information.

9. The method of claim 1, wherein a cyclic redundancy check (CRC) of the MUCC-DCI is longer than a CRC of the SICC-DCI.

10. The method of claim 1, wherein, in order to detect the MUCC-DCI, the UE performs blind decoding per aggregation level (AL) a predetermined number of times in a shared search space (SS).

11. The method of claim 10, wherein the number of times of blind decoding previously determined per AL is re-set.

12. A user equipment (UE), comprising:

a transceiver transmitting and receiving a radio signal; and

a processor connected to the transceiver, wherein the processor;

receives at least one of single-carrier downlink control information (SICC-DCI) which schedules only one serving cell or multi-carrier downlink control information (MUCC-DCI) which simultaneously schedules multiple serving cells in a subframe, and

blind-decodes at least one of the SICC-DCI or the MUCC-DCI,

wherein the SICC-DCI is received in a physical downlink control channel (PDCCH) region located at first N (N is a natural number) orthogonal frequency division multiplexing (OFDM) symbols of the subframe,

wherein the MUCC-DCI is received in an enhanced PDCCH (EPDCCH) region located at OFDM symbols following the first N OFDM symbols of the subframe, and

wherein, when the processor receives both the SICC-DCI and the MUCC-DCI in the subframe, the processor discards the SICC-DCI and regards the MUCC-DCI as valid.