HARQ method and apparatus for communication system

• US 9,356,756 B2
• Filed: 03/12/2012
• Issued: 05/31/2016
• Est. Priority Date: 03/11/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Youngbum, Cho, Joonyoung, Han, Jinkyu, Lee, Juho, Ji, Hyoungju, Choi, Seunghoon
• Primary Examiner(s): Weidner, Timothy J
• Application Number:
  US13/417,851
• Publication Number:
  US 20120230272A1
• Time in Patent Office: 1,541 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• 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 5/0078 Timing of allocation
• CPC Class Codes: H04L 5/0098 Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• 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

Abstract

Methods and apparatus are provided to support HARQ in a communication system adopting cross-carrier scheduling. A second cell is scheduled at a first cell. Data, transmitted by a terminal, at a subframe of the second cell is received. A subframe, in the first cell, is determined for transmitting a HARQ acknowledgement corresponding to the data, and a subframe, in the first cell, is determined carrying scheduling information of the second cell. It is determined whether the subframe for transmitting the HARQ acknowledgement and the subframe carrying scheduling information of the second cell are the same. When the subframe for transmitting the HARQ acknowledgement and the subframe carrying the scheduling information are not the same, the subframe for transmitting the HARQ acknowledgement and the subframe carrying the scheduling information are matched to each other.

Claims

1. A communication method of a base station supporting hybrid automatic repeat request (HARQ) in a communication system, the communication method comprising:

transmitting, by a base station, control information related to a second component carrier on a first component carrier;

receiving, by the base station, from a terminal, data in a subframe on the second component carrier based on the control information; and

identifying, by the base station, a first subframe of the first component carrier, for transmitting a HARQ acknowledgement corresponding to the data, and a second subframe of the first component carrier, for transmitting scheduling information of the second component carrier,

wherein the first subframe of the first component carrier and the second subframe of the first component carrier are matched to a same subframe based on an uplink reference uplink downlink configuration, the uplink reference uplink downlink configuration being determined based on an uplink downlink configuration of the first component carrier if a pair of an uplink downlink configuration of a first cell and an uplink downlink configuration of a second cell is a predetermined set.

2. The communication method of claim 1, wherein matching timings of the first subframe of the first component carrier and the second subframe of the first component carrier comprises, if the first subframe of the first component carrier is earlier in time than the second subframe of the first component carrier, setting a time of the first subframe of the first component carrier to a time of the second subframe of the first component carrier or setting the time of the second subframe of the first component carrier to the time of the first subframe of the first component carrier.

3. The communication method of claim 1, wherein matching timings of the first subframe of the first component carrier and the second subframe of the first component carrier comprises, if the second subframe of the first component carrier is earlier in time than the first subframe of the first component carrier, setting a time of the second subframe of the first component carrier to a time of the first subframe of the first component carrier, and wherein a subframe transmitting data from the terminal according to the scheduling information of the second component carrier has the same timing as the subframe of the second component carrier.

4. The communication method of claim 1, wherein matching timings of the first subframe of the first component carrier and the second subframe of the first component carrier comprises, if the second subframe of the first component carrier is earlier in time than the first subframe of the first component carrier, setting a time of the second subframe of the first component carrier to a time of the first subframe of the first component carrier, and wherein a subframe transmitting data from the terminal according to the scheduling information of the second component carrier appears first among subframes available for transmitting the data from the terminal.

17. The communication method of claim 1, wherein the subframe of the second component carrier has a timing identical to the first component carrier, and the first subframe of the first component carrier and the second subframe of the first component carrier are determined according to a transmission timing in the first component carrier.

5. A communication method of a terminal supporting hybrid automatic repeat request (HARQ) in a communication system, the communication method comprising:

receiving, by a terminal, control information related to a second component carrier on a first component carrier;

transmitting, by the terminal, to a base station, data in a subframe on the second component carrier, based on the control information; and

receiving, by the terminal, from the base station, a HARQ acknowledgement corresponding to the data and scheduling information for the second component carrier in a same subframe of the first component carrier,

wherein the same subframe is determined based on an uplink reference uplink downlink configuration, the uplink reference uplink downlink configuration being determined based on an uplink downlink configuration of the first component carrier if a pair of an uplink downlink configuration of a first cell and an uplink downlink configuration of a second cell is a predetermined set.

6. The communication method of claim 5, wherein, if a first subframe of the first component carrier transmitting the HARQ acknowledgement is earlier in time than a second subframe of the first component carrier transmitting the scheduling information, the matched subframe is the second subframe of the first component carrier to which a time of the first subframe of the first component carrier is set, or the first subframe of the first component carrier to which a time of the second subframe of the first component carrier is set.

7. The communication method of claim 5, wherein the matched subframe is a second subframe of the first component carrier transmitting the scheduling information to which a time of a first subframe of the first component carrier transmitting the HARQ acknowledgement is set, if the second subframe of the first component carrier is earlier in time than the first subframe of the first component carrier, and wherein a subframe transmitting data from the terminal according to the scheduling information has the same timing as the first subframe of the second component carrier.

8. The communication method of claim 5, wherein the matched subframe is a first subframe of the first component carrier transmitting the HARQ acknowledgement to which a time of a second subframe of the first component carrier transmitting the scheduling information is set, if the second subframe of the first component carrier is earlier in time than the first subframe of the first component carrier, and wherein a subframe transmitting data from the terminal according to the scheduling information appears first among subframes available for transmitting the data from the terminal.

18. The communication method of claim 5, wherein the subframe of the second component carrier has a timing identical to the first component carrier, and the first subframe of the first component carrier and the second subframe of the first component carrier are determined according to a transmission timing in the first component carrier.

9. A base station supporting hybrid automatic repeat request (HARQ) in a communication system, the base station comprising:

a transceiver configured to transmit and receive a signal; and

a controller configured to transmit control information related to a second component carrier on a first component carrier, receive data, transmitted by a terminal, in a subframe on the second component carrier based on the control information, identify a first subframe of the first component carrier for transmitting a HARQ acknowledgement corresponding to the data and a second subframe of the first component carrier for transmitting scheduling information of the second component carrier,

wherein the first subframe of the first component carrier and the second subframe of the first component carrier are matched to a same subframe based on an uplink reference uplink downlink configuration, the uplink reference uplink downlink configuration being determined based on an uplink downlink configuration of the first component carrier if a pair of an uplink downlink configuration of a first cell and an uplink downlink configuration of a second cell is a predetermined set.

10. The base station of claim 9, wherein, if the first subframe of the first component carrier is earlier in time than the second subframe of the first component carrier, the controller is further configured to set a time of the first subframe of the first component carrier to a time of the second subframe of the first component carrier or set the time of the second subframe of the first component carrier to the time of the first subframe of the first component carrier.

11. The base station of claim 9, wherein, if the second subframe of the first component carrier is earlier in time than the first subframe of the first component carrier, the controller is further configured to set a time of the second subframe of the first component carrier to a time of the first subframe of the first component carrier, and wherein a subframe transmitting data from the terminal according to the scheduling information has the same timing as the subframe of the second component carrier.

12. The base station of claim 9, wherein, if the second subframe of the first component carrier is earlier in time than the first subframe of the first component carrier, the controller is further configured to set a time of the second subframe of the first component carrier to a time of the first subframe of the first component carrier, and wherein a subframe transmitting data from the terminal according to the scheduling information appears first among subframes available for transmitting the data from the terminal.

19. The base station of claim 9, wherein the subframe of the second component carrier has a timing identical to the first component carrier, and a first subframe of the first component carrier for transmitting the HARQ acknowledgement and a second subframe of the first component carrier for transmitting the scheduling information are determined by the controller according to a transmission timing in the first component carrier.

13. A terminal supporting hybrid automatic repeat request (HARQ) in a communication system, the terminal comprising:

a transceiver configured to transmit and receive a signal; and

a controller configured to receive control information related to a second component carrier on a first component carrier, to transmit, to a base station, data in a subframe on the second component carrier based on the control information, and to receive a HARQ acknowledgement corresponding to the data and scheduling information for the second component carrier in a same subframe in the first component carrier,

wherein the same subframe is determined based on an uplink reference uplink downlink configuration, the uplink reference unlink downlink configuration being determined based on an uplink downlink configuration of the first component carrier if a pair of an uplink downlink configuration of the first cell and an uplink downlink configuration of the second cell is a predetermined set.

14. The terminal of claim 13, wherein, if a first subframe of the first component carrier transmitting the HARQ acknowledgement is earlier in time than a second subframe of the first component carrier transmitting the scheduling information, the same subframe is the second subframe of the first component carrier to which a time the first subframe of the first component carrier is set, or the first subframe of the first component carrier to which a time of the second subframe of the first component carrier is set.

15. The terminal of claim 13, wherein the same subframe is a second subframe of the first component carrier transmitting the scheduling information to a time which a first subframe of the first component carrier transmitting the HARQ acknowledgement is set, if the second subframe of the first component carrier is earlier in time than the first subframe of the first component carrier, and wherein a subframe transmitting data from the terminal according to the scheduling information has the same timing as a subframe of the second component carrier if transmitting the data.

16. The terminal of claim 13, wherein the same subframe is a first subframe of the first component carrier transmitting HARQ acknowledgement to which a time of the second subframe of the first component carrier transmitting the scheduling information is set, if the second subframe of the first component carrier is earlier in time than the first subframe of the first component carrier, and wherein a subframe transmitting data from the terminal according to the scheduling information appears first among subframes available for transmitting the data from the terminal.

20. The terminal of claim 13, wherein a subframe of the second component carrier transmitting the data from the terminal has a timing identical to the first component carrier, and a first subframe of the first component carrier for transmitting the HARQ acknowledgement and a second subframe of the second component carrier for transmitting the scheduling information are determined by the controller according to a transmission timing in the first component carrier.

21. An article of manufacture for supporting hybrid automatic repeat request (HARQ) in a communication system, comprising a non-transitory machine readable medium containing one or more programs which when executed implement:

transmitting control information related to a second component carrier on a first component carrier;

receiving, from a terminal, data in a subframe on the second component carrier based on the control information;

identifying a first subframe of the first component carrier, for transmitting a HARQ acknowledgement corresponding to the data, and a second subframe of the first component carrier, for transmitting scheduling information of the second component carrier;

wherein the first subframe of the first component carrier and the second subframe of the first component carrier are matched to a same subframe based on an uplink reference uplink downlink configuration, the uplink reference uplink downlink configuration being determined based on an uplink downlink configuration of the first component carrier if a pair of an uplink downlink configuration of a first cell and an uplink downlink configuration of a second cell is a predetermined set.

22. An article of manufacture for supporting hybrid automatic repeat request (HARQ) in a communication system, comprising a non-transitory machine readable medium containing one or more programs which when executed implement:

receiving, by a terminal, control information related to a second component carrier on a first component carrier;

transmitting, to a base station, data in a subframe on the second component carrier based on the control information; and

receiving, from the base station, a HARQ acknowledgement corresponding to the data and scheduling information for the second component carrier in a same subframe of the first component carrier,

wherein the same subframe is determined based on an uplink reference uplink downlink configuration, the uplink reference uplink downlink configuration being determined based on an uplink downlink configuration of the first carrier if a pair of an uplink downlink configuration of the first cell and an uplink downlink configuration of the second cell is a predetermined set.