METHOD FOR TRANSMITTING AND RECEIVING DOWNLINK DATA IN WIRELESS COMMUNICATION SYSTEM, AND APPARATUS THEREFOR

• US 20190074936A1
• Filed: 12/28/2015
• Published: 03/07/2019
• Est. Priority Date: 08/21/2015
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: LEE, Eunjong, CHO, Heejeong, HAHN, Genebeck, BYUN, Ilmu
• Granted Patent: US 10,447,438 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/02 Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas RAKE receivers H04B1/7115
• CPC Class Codes: H04J 13/004 Orthogonal
• CPC Class Codes: H04J 13/0059 CAZAC [constant-amplitude and zero auto-correlation]
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/18 Automatic repetition systems, e.g. Van Duuren systems
• CPC Class Codes: H04L 1/1819 with retransmission of additional or different redundancy
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1896 ARQ related signaling
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• 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 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 76/11 Allocation or use of connection identifiers
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: H04W 80/02 Data link layer protocols

Abstract

A method for transmitting and receiving downlink (DL) data performed by a user equipment (UE) in a wireless communication system according to the present disclosure includes receiving a first DL grant from a base station (BS); receiving first DL data based on the first DL grant from the BS; transmitting a HARQ response in response to the first DL data to the BS; and receiving one or more second DL data from the BS, and a specific frequency shift pattern is set in a frequency region between a resource in which the second DL data is received and a resource in which the first DL data is received, or between resources in which the second DL data are received.

Claims

1. A method for transmitting and receiving a downlink (DL) data in a wireless communication system, the method performed by a user equipment (UE) comprising:

receiving a first DL grant from a base station (BS);

receiving a first DL data based on the first DL grant from the BS;

transmitting a HARQ response in response to the first DL data to the BS; and

receiving one or more second DL data from the BS,

wherein a specific frequency shift pattern is set in a frequency region between a resource in which the second DL data is received and a resource in which the first DL data is received, or between resources in which the second DL data are received.

2. The method of claim 1, wherein the first DL data is initial DL data, and

wherein the one or more second DL data are retransmission data for the first DL data.

3. The method of claim 1, wherein the one or more second DL data are received in a frequency shifted resource as much as a predetermined value from the resource in which the first DL data is received or from the resource in which the second DL data is received in a frequency region.

4. The method of claim 1, wherein the specific frequency shift pattern is determined by Equation below,

Lowest PRB index_(i+1)^th _data=(Lowest PRB index_i^th _data+shift_n)% N_RB

herein, i represents an integer value satisfying condition 1≤

i≤

n, n represents a maximum HARQ retransmission count, i=1 represents an initial data transmission, shift_n represents an integer value satisfying the condition 0≤

shift_n≤

N_RB−

1, N_RB represents an RB number that is available to be set depending on a bandwidth, and % represents a modulo operation symbol.

5. The method of claim 1, wherein the one or more second DL data are received from the BS after a predetermined time from the time when the HAW response is transmitted.

6. The method of claim 1, further comprising receiving a retransmission indicator indicating that the one or more second DL data are data which are retransmitted without a DL grant in relation to a reception of the one or more second DL data.

7. The method of claim 6, wherein the retransmission indicator is received from the BS by being multiplexed with the one or more second DL data in a PDSCH resource region.

8. The method of claim 7, wherein the retransmission indicator is allocated in a unit of resource element (RE) or in a unit of resource block (RB) in the PDSCH resource region.

9. The method of claim 7, wherein the retransmission indicator is allocated in a resource except the resource allocated for a reference signal (RS) or DL data.

10. The method of claim 9, wherein the retransmission indicator is allocated in both symbols of a symbol allocated for the reference signal or allocated in any one side symbol of a symbol allocated for the reference signal.

11. The method of claim 6, further comprising receiving control information in relation to a resource position to which the retransmission indicator is allocated,

wherein the control information is received through an RRC message, a MAC message or a DL grant.

12. The method of claim 6, further comprising determining whether to perform HARQ combining of the first DL data and the one or more second DL data based on the received retransmission indicator.

13. The method of claim 1, further comprising receiving a simple DL grant including resource information in relation to a reception of the one or more second DL data from the BS.

14. The method of claim 13, wherein the simple DL grant is received through a UE-specific Search Space (USS) of a Physical Downlink Control Channel (PDCCH), and

wherein the simple DL grant is received in a unit of simple Control Channel Elements (CCEs).

15. The method of claim 14, wherein the simple DL grant includes at least one of a CRC field or a New Data Indicator (NM) field, when synchronous HARQ is applied.

16. The method of claim 14, wherein the simple DL grant includes at least one of a CRC field, a New Data Indicator (NDI) field or a HARQ related field, when asynchronous HARQ is applied.

17. The method of claim 15, wherein the NDI field is information indicating whether the received DL data is retransmission data or new data.

18. The method of claim 13, wherein the simple DL grant is received through a Common Search Space (CSS) of a PDCCH,

wherein the simple DL grant includes at least one retransmission indicator only,

wherein the retransmission indicator is information indicating that the one or more second DL data are data retransmitted without a DL grant in relation to a reception of the one or more second DL data, and

wherein the simple DL grant further includes a PID field indicating a HARQ process ID (PID) for the one or more second DL data when the retransmission indicator is set as a value indicating retransmission data.

19. The method of claim 6, wherein the retransmission indicator is received through a Physical Retransmission Indicator Channel (PRICH), and

wherein a resource of the PRICH is mapped by at least one of a lowest Physical Resource Block (PRB) index of the second DL data or DL antenna port layer.

20. A user equipment (UE) for transmitting and receiving a downlink (DL) data in a wireless communication system, comprising:

a radio frequency (RF) unit for transmitting and receiving a radio signal; and

a processor functionally connected to the RF unit,

wherein the processor is configured to;

receive a first DL grant from a base station (BS);

receive a first DL data based on the first DL grant from the BS;

transmit a HARQ response in response to the first DL data to the BS; and

receive at least one second DL data from the BS,

wherein a specific frequency shift pattern is set in a frequency region between a resource in which the at least one second DL data is received and a resource in which the first DL data is received, or between resources in which the at least one second DL data are received.