Method for transceiving enhanced physical downlink control channel in wireless access system supporting unlicensed band, and device supporting same

• US 10,477,565 B2
• Filed: 12/23/2015
• Issued: 11/12/2019
• Est. Priority Date: 12/23/2014
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Seonwook, Ahn, Joonkui, Lee, Seungmin, Kim, Kijun, Yang, Suckchel, Seo, Hanbyul, Park, Jonghyun, You, Hyangsun
• Primary Examiner(s): Sheikh, Ayaz R
• Assistant Examiner(s): Asefa, Debebe A
• Application Number:
  US15/531,306
• Publication Number:
  US 20170367092A1
• Time in Patent Office: 1,420 Days
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0689 using different transmission schemes, at least one of them being a diversity transmission scheme
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2603 Signal structure ensuring backward compatibility with legacy system
• CPC Class Codes: H04L 41/064 involving time analysis
• CPC Class Codes: H04L 47/28 in relation to timing considerations
• CPC Class Codes: H04L 47/74 measures in reaction to resource unavailability
• CPC Class Codes: H04L 47/826 Involving periods of time
• 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 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 72/04 : Wireless resource allocation
• CPC Class Codes: H04W 72/0446 : Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/12 : Wireless traffic scheduling
• CPC Class Codes: H04W 72/1215 : for collaboration of different radio technologies
• CPC Class Codes: H04W 72/23 : in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/0808 : using carrier sensing, e.g. carrier sense multiple access [CSMA]
• CPC Class Codes: H04W 76/15 : Setup of multiple wireless link connections
• CPC Class Codes: H04W 76/28 : Discontinuous transmission [DTX]; Discontinuous reception [DRX]

Abstract

The present invention relates to a method for a terminal receiving an enhanced physical downlink control channel (EPDCCH) in a wireless access system supporting an unlicensed band, and the method may comprise the steps of: receiving, through an unlicensed-band cell (Ucell) configured in an unlicensed band, an EPDCCH comprising control information for scheduling the Ucell; and, on the basis of the control information, receiving downlink data from the Ucell. Here, if the EPDCCH is transmitted through a partial subframe (pSF), enhanced resource element groups (EREGs) constituting the EPDCCH are indexed from the start symbol of the pSF, and the pSF has a smaller size than one subframe, and the starting position of the pSF may not correspond to the subframe boundary of a primary cell (Pcell) configured in a licensed band.

Claims

1. A method for receiving downlink data by a user equipment (UE) in a wireless access system, the method comprising:

receiving, by the UE, an enhanced physical downlink control channel (EPDCCH) within enhanced resource element groups (EREGs) in a time resource within a subframe for an unlicensed band cell (UCell), wherein the EPDCCH comprises control information on scheduling the UCell; and

receiving, by the UE, the downlink data on the UCell based on the control information,

the EREGs are indexed starting from a symbol included in the subframe, and a starting boundary of the time resource is different from a starting boundary of the subframe and the symbol is different from a 1st symbol of the subframe.

2. The method of according to claim 1, wherein the time resource starts in a 2nd slot of the subframe, and the symbol is a starting symbol of the 2nd slot.

3. The method of claim 1, wherein a number of EREGs in an enhanced control channel element (ECCE) of the EPDCCH is fixed to a first value.

4. The method of claim 3, wherein the first value is identified based on a number of symbols in the time resource.

5. The method of claim 1, wherein a number of EPDCCH candidates for detecting the EPDCCH is changed based on a number of symbols in the time resource.

6. The method of claim 5, wherein the EPDCCH is configured based on a case 1 scheme in case of the number of the symbols in the time resource being equal to or less than a specific number, and

wherein the EPDCCH is configured based on a case 2 scheme in case of a number of EREGs in an enhanced control channel element (ECCE) of the EPDCCH being fixed to a second value.

7. The method of claim 6, wherein the EPDCCH is configured by increasing a number of ECCEs in the EPDCCH in case of the EPDCCH being configured based on the case 1 scheme, and the EPDCCH is configured by reducing the number of the ECCEs in the EPDCCH in case of the EPDCCH being configured based on the case 2 scheme.

8. A user equipment (UE) for receiving downlink data in a wireless access system, the UE comprising:

a transmitter;

a receiver; and

at least one processor coupled with the transmitter and the receiver,

wherein the at least one processor is configured to;

receive an enhanced physical downlink control channel (EPDCCH) within enhanced resource element groups (EREGs) in a time resource within a subframe for an unlicensed band cell (UCell), wherein the EPDCCH comprises control information on scheduling the UCell; and

receive the downlink data on the UCell based on the control information,

wherein the EREGs are indexed starting from a symbol included in the subframe, and

wherein a starting boundary of the time resource is different from a starting boundary of the subframe and the symbol is different from a 1st symbol of the subframe.

9. The UE of claim 8, wherein the time resource starts in a 2nd slot of the subframe, and the symbol is a starting symbol of the 2nd slot.

10. The UE of claim 8, wherein a number of EREGs in an enhanced control channel element (ECCE) of the EPDCCH is fixed to a first value.

11. The UE of claim 10, wherein the first value is identified based on a number of symbols in the time resource.

12. The UE of claim 8, wherein a number of EPDCCH candidates for detecting the EPDCCH is changed based on a number of symbols in the time resource.

13. The UE of claim 12, wherein the EPDCCH is configured based on a case 1 scheme in case of the number of the symbols in the time resource being equal to or less than a specific number, and

wherein the EPDCCH is configured based on a case 2 scheme in case of a number of EREGs in an enhanced control channel element (ECCE) of the EPDCCH being fixed to a second value.

14. The UE of claim 13, wherein the EPDCCH is configured by increasing a number of ECCEs in the EPDCCH in case of the EPDCCH being configured based on the case 1 scheme, and the EPDCCH is configured by reducing the number of the ECCEs in the EPDCCH in case of the EPDCCH being configured based on the case 2 scheme.

15. A base station (BS) for transmitting downlink data in a wireless access system, the BS comprising:

a transmitter;

a receiver; and

at least one processor coupled with the transmitter and the receiver,

wherein the at least one processor is configured to;

transmit an enhanced physical downlink control channel (EPDCCH) within enhanced resource element groups (EREGs) in a time resource within a subframe for an unlicensed band cell (UCell), wherein the EPDCCH comprises control information on scheduling the UCell; and

transmit the downlink data on the UCell based on the control information,

wherein the EREGs are indexed starting from a symbol included in the subframe, and

wherein a starting boundary of the time resource is different from a starting boundary of the subframe and the symbol is different from a 1st symbol of the subframe.