Method and apparatus for processing downlink harq process in carrier aggregation
AssigneeNEC Corporation
InventorKengo OKETANI
Life of this patent
Estimating the term…
Abstract
A radio terminal (1) determines a maximum number of HARQ processes used for DL transport blocks received in an FDD serving cell (32) based on whether or not the radio terminal (1) is configured to monitor a downlink (DL) control channel of a TDD serving cell (31) for scheduling the FDD serving cell (32). This contributes, for example, to appropriate determination of a maximum number of HARQ processes used for DL transport blocks transmitted in the FDD serving cell when FDD-TDD carrier aggregation (FDD-TDD CA) is configured and when cross-carrier scheduling is configured for DL transmission in the FDD serving cell.
Claims15
A method for performing a downlink hybrid automatic repeat request (HARQ) in a radio terminal which is configured by a base station with a plurality of component carriers including first and second component carriers for carrier aggregation, the method comprising:
- if a frame structure of a first serving cell operated using the first component carrier is a frame structure type 2 for time division duplex (TDD) and a frame structure of a second serving cell operated using the second component carrier is a frame structure type 1 for frequency division duplex (FDD), determining a maximum number of downlink hybrid automatic repeat request (HARQ) processes used for downlink transport blocks received in the second serving cell based on whether or not the radio terminal is configured to monitor a first downlink control channel in the first serving cell for scheduling the second serving cell.
A radio terminal which is configured by a base station with a plurality of component carriers including first and second component carriers for carrier aggregation, the radio terminal comprising:
- a processor configured to, if a frame structure of a first serving cell operated using the first component carrier is a frame structure type 2 for time division duplex (TDD) and a frame structure of a second serving cell operated using the second component carrier is a frame structure type 1 for frequency division duplex (FDD), determine a maximum number of downlink hybrid automatic repeat request (HARD) processes used for downlink transport blocks received in the second serving cell based on whether or not the radio terminal is configured to monitor a first downlink control channel in the first serving cell for scheduling the second serving cell.
A method performed by a base station that allocates a plurality of component carriers including first and second component carriers to a radio terminal for carrier aggregation, the method comprising:
- if a frame structure of a first serving cell operated using the first component carrier is a frame structure type 2 for time division duplex (TDD) and a frame structure of a second serving cell operated using the second component carrier is a frame structure type 1 for frequency division duplex (FDD), determining a maximum number of downlink hybrid automatic repeat request (HARQ) processes used for downlink transport blocks received in the second serving cell based on whether or not the radio terminal is configured to monitor a first downlink control channel in the first serving cell for scheduling the second serving cell;
- and
- transmitting downlink transport blocks by using multiple HARQ processes in accordance with the maximum number.
15-28. (canceled)
Dependencies are inferred from the claim text.