Apparatus and method for transmitting ACK/NACK in TDD system
First Claim
1. An operating method for a user equipment (UE) in a time division duplexing (TDD) system, the method comprising:
- determining a number of Acknowledgement (ACK) bits for multiple downlink (DL) subframes based on a transmission mode and a number of at least one component carrier (CC);
selecting a feedback mode of at least two feedback modes based on the number of ACK bits; and
generating feedback information for the DL subframes based on the selected feedback mode,wherein selecting the feedback mode comprises;
if the number of ACK bits is greater than a predefined number, selecting a bundling feedback mode; and
if the number of ACK bits is equal to or lower than the predefined number, selecting a non-bundling feedback mode.
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Abstract
The present invention provides a method and apparatus for transmitting an ACK/NACK in a TDD system. A component carrier (CC) configuration for a user equipment (UE) and a transmission mode of each CC are received. An ACK/NACK feedback mode is selected based on an overhead status for feedback in an uplink. An ACK/NACK is processed according to the selected feedback mode. And the ACK/NACK is transmitted in the uplink. The method provided by the present invention can avoid excessive overhead for feedback in uplink in various extreme circumstances while ensuring satisfying performances of downlinks under many configurations.
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Citations
24 Claims
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1. An operating method for a user equipment (UE) in a time division duplexing (TDD) system, the method comprising:
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determining a number of Acknowledgement (ACK) bits for multiple downlink (DL) subframes based on a transmission mode and a number of at least one component carrier (CC); selecting a feedback mode of at least two feedback modes based on the number of ACK bits; and generating feedback information for the DL subframes based on the selected feedback mode, wherein selecting the feedback mode comprises; if the number of ACK bits is greater than a predefined number, selecting a bundling feedback mode; and if the number of ACK bits is equal to or lower than the predefined number, selecting a non-bundling feedback mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus of a user equipment (UE) in a time division duplexing (TDD) system, the apparatus comprising:
a controller configured to; determine a number of Acknowledgement (ACK) bits for multiple downlink (DL) subframes based on a transmission mode and a number of at least one component carrier (CC); select a feedback mode of at least two feedback modes based on the number of ACK bits, wherein the controller is further configured to select a bundling feedback mode if the number of ACK bits is greater than a predefined number and select a non-bundling feedback mode if the number of ACK bits is equal to or lower than the predefined number; and generate feedback information for the DL subframes based on the selected feedback mode. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
Specification