Method and terminal for receiving bundle of EPDCCHs

• US 9,860,890 B2
• Filed: 12/17/2014
• Issued: 01/02/2018
• Est. Priority Date: 12/18/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: You, Hyangsun, Yi, Yunjung, Ahn, Joonkui, Seo, Inkwon, Yang, Suckchel, Seo, Hanbyul
• Primary Examiner(s): Cho, Hong
• Application Number:
  US15/034,628
• Publication Number:
  US 20160278054A1
• Time in Patent Office: 1,112 Days
• Field of Search: None
• CPC Class Codes: H04B 7/2671 Arrangements for Wireless Time-Division Multiple Access [TDMA] System Synchronisation
• 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 1/0061 Error detection codes
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2607 Cyclic extensions
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 92/18 between terminal devices

Abstract

One disclosure of the present specification provides a method for receiving EPDCCH by an MTC device. The method comprises: a step for determining a first search space and a second search space for receiving EPDCCH on a first subframe and a second subframe, respectively, from among N-number of subframes, if a bundle of EPDCCHs in which the same EPDCCH is repeated on the N-number of subframes should be received, wherein each of the first and second search spaces is determined on the basis of the number of EPDCCH candidates, and determined by any one of a first case, a second case and a third case classified on the basis of a DCI format and whether a CP being used is a normal CP or an extended CP; and a step for decoding the EPDCCH in the second search space if the cases for determining the first search space and the second search space are the same.

Claims

1. A method of receiving an enhanced physical downlink control channel (EPDCCH) by a user equipment (UE), the method comprising:

determining a first search space for receiving an EPDCCH on a first subframe among N subframes when an EPDCCH bundle in which the same EPDCCH is repeated on the N subframes is to be received;

determining a second search space for receiving the EPDCCH on a second subframe among the N subframes, each of the first and second search spaces being determined based on a number of EPDCCH candidates, and the number of EPDCCH candidates being determined according to any one of a first case (case

     1), a second case (case

     2) and a third case (case

     3) classified on the basis of a DCI format and whether a cyclic prefix (CP) being used is a normal CP or an extended CP; and

decoding the EPDCCH in the second search space of the second subframe when cases for determining the first search space and the second search space are the same.

2. The method of claim 1, wherein the case for the first search space and the case for the second search space are the first case, which supports aggregation level 32.

3. The method of claim 1, further comprising:

skipping the decoding of the EPDCCH in the second search space of the second subframe when the case for the first search space and the case for the second search space are different.

4. The method of claim 1, wherein the number of EPDCCH candidates is determined on an aggregation level.

5. The method of claim 4, wherein

the first case supports aggregation levels of 2, 4, 8, 16, and 32,

the second case supports aggregation levels of 2, 4, 8, and 16,

the third case supports aggregation levels of 2, 4, 8, and 16, and

different numbers of EPDCCH candidates are configured by aggregation levels in the second case and the third case.

6. The method of claim 5, wherein the decoding of the EPDCCH in the second search space is performed assuming that an aggregation level for the first search space and an aggregation level for the second search space are the same.

7. The method of claim 5, when an aggregation level for the first search space and an aggregation level for the second search space are the aggregation levels for the first case.

8. The method of claim 5, wherein the UE assumes that a number of EPDCCH candidates in the second search space is a number of EPDCCH candidates in an aggregation level two times an aggregation level for the second search space.

9. The method of claim 1, wherein the UE is a machine-type communication (MTC) device located in a coverage extension region.

10. A user equipment (UE) for receiving an enhanced physical downlink control channel (EPDCCH), the UE comprising:

a radio frequency (RF) unit; and

a processor to determine a first search space for receiving an EPDCCH on a first subframe among N subframes when an EPDCCH bundle in which the same EPDCCH is repeated on the N subframes is to be received through the RF unit, to decode the first subframe in the first search space, to determine a second search space for receiving the EPDCCH on a second subframe among the N subframes, and to decode the second subframe in the second search space,

wherein the first and second search spaces are determined based on a number of EPDCCH candidates,

the EPDCCH candidates are determined according to any one of a first case (case

     1), a second case (case

     2) and a third case (case

     3), and

the processor decodes the second subframe when cases for the first search space and the second search space are the same.

11. The UE of claim 10, wherein the case for the first search space and the case for the second search space are the first case.

12. The UE of claim 10, wherein the processor assumes that no EPDCCH is transmitted on the second subframe when the case for the first search space and the case for the second search space are different.

13. The UE of claim 10, wherein the UE is a machine-type communication (MTC) device located in a coverage extension region.