HARQ method and apparatus for communication system

Patent metadata

Field	Value
Publication number	US-9356756-B2
Application number	US-201213417851-A
Country	US
Kind code	B2
Filing date	Mar 12, 2012
Priority date	Mar 11, 2011
Publication date	May 31, 2016
Grant date	May 31, 2016

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.

First claim

What is claimed is:

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.

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.

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 th

Assignees

• Kim Youngbum
• Cho Joonyoung
• Han Jinkyu
• Lee Juho
• Ji Hyoungju
• Choi Seunghoon
• Samsung Electronics Co Ltd

Inventors

• Kim Youngbum
• Cho Joonyoung
• Han Jinkyu
• Lee Juho
• Ji Hyoungju
• Choi Seunghoon

Classifications

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04L5/001

  the frequencies being arranged in component carriers · CPC title

• H04L5/0023

  Time-frequency-space · CPC title

• H04W72/0453

  Resources in frequency domain, e.g. a carrier in FDMA · CPC title