Method and apparatus for making HARQs in carrier aggregation systems
AssigneeLG Electronics Inc.
InventorsDongyoun Seo, Bonghoe Kim, Joonkui Ahn, Suckchel Yang, Hanbyul Seo, Seungmin Lee, Yunjung Yi
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Abstract
A method of performing hybrid automatic repeat request (HARQ) in a carrier aggregation system, the method includes receiving downlink data through a first subframe of a first carrier; transmitting acknowledgement/not-acknowledgement (ACK/NACK) for the downlink data through a second subframe of a second carrier; and receiving the downlink data again through a third subframe of the first carrier, wherein the first carrier is a carrier which s comprised of downlink subframe only.
Claims10
A method for performing a hybrid automatic repeat request (HARQ) process in a carrier aggregation system, the method performed by a user equipment (UE) and comprising:
- determining a maximum number of HARQ processes for a serving cell;
- and
- performing at least one HARQ process among the HARQ processes for the serving cell,
- wherein:
- if the UE is configured with a primary cell using a Time Division Duplex (TDD) radio frame and a secondary cell using a Frequency Division Duplex (FDD) radio frame and
- if the serving cell is the secondary cell using the FDD radio frame,
- the maximum number of HARQ processes for the serving cell is determined by a uplink-downlink (UL-DL) configuration of the primary cell and the maximum number of HARQ processes for the serving cell is determined as shown in a table below:
- UL-DL
- Configuration of the
- Maximum number of HARQ
- primary cell
- processes for the secondary cell
- 0
- 10
- 1
- 11
- 2
- 12
- 3
- 15
- 4
- 16
- 6
- 12.
A user equipment (UE) for performing hybrid automatic repeat request (HARQ) in a carrier aggregation system, the UE comprising:
- a transceiver that transmits and receives a radio signal;
- and
- a processor connected with the transceiver,
- wherein the process is configured to:
- determine a maximum number of HARQ processes for a serving cell, and
- perform at least one HARQ process among the HARQ processes for the serving cell,
- wherein:
- if the UE is configured with a primary cell using a Time Division Duplex (TDD) radio frame and a secondary cell using a Frequency Division Duplex (FDD) radio frame and
- if the serving cell is the secondary cell using the FDD radio frame,
- the maximum number of HARQ processes for the serving cell is determined by a uplink-downlink (UL-DL) configuration of the primary cell and the maximum number of HARQ processes for the serving cell is determined as shown in a table below:
- UL-DL
- Configuration of the
- Maximum number of HARQ
- primary cell
- processes for the secondary cell
- 0
- 10
- 1
- 11
- 2
- 12
- 3
- 15
- 4
- 16
- 6
- 12.
Dependencies are inferred from the claim text.