Method, base station, and user equipment for feeding back ACK/NACK information for carrier aggregation
First Claim
1. A method for feeding back Acknowledgement/Negative-acknowledgement (ACK/NACK) information for carrier aggregation through an uplink component carrier X, comprising:
- receiving, by a user equipment (UE), device, one or more pieces of downlink control information (DCI) carried by one or more physical downlink control channels (PDCCHs) transmitted on a downlink component carrier Y from a base station, wherein each of the one or more pieces of DCI includes a transmission power control (TPC) command field, scheduling information for a physical downlink shared channel (PDSCH), and is transmitted through a PDCCH corresponding to the PDSCH;
determining, by the UE device, that a first command indicated by a fist TPC command field in at least one piece of the one or more pieces of DCI is an ACK resource indication (ARI) command if the downlink component carrier Y is a non-system-linked downlink component carrier of the uplink component carrier X, wherein the ARI command indicates which resource of a group of uplink ACK channel resources assigned through a higher-layer signaling are to be used to feed back ACK/NACK information, and determining that a second command indicated by a second TPC command field in at least one piece of the one or more pieces of DCI is a TPC command if the downlink component carrier Y is a system-linked downlink component carrier of the uplink component carrier X; and
feeding back, by the UE, ACK/NACK information through the uplink component carrier X according to the determined command.
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Abstract
The present invention provides a method, a base station, and a user equipment for feeding back ACK/NACK information for carrier aggregation. The method includes: configuring a common field preset in DCI as at least one type of command field related to ACK/NACK feedback of at least two types of command fields related to ACK/NACK feedback, where the common field can be configured as the command fields related to ACK/NACK feedback; and sending the DCI to a user equipment, so that the user equipment feeds back ACK/NACK information according to the DCI. The present invention may realize backward compatibility of the ACK/NACK information feedback with an LTE system in carrier aggregation.
45 Citations
14 Claims
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1. A method for feeding back Acknowledgement/Negative-acknowledgement (ACK/NACK) information for carrier aggregation through an uplink component carrier X, comprising:
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receiving, by a user equipment (UE), device, one or more pieces of downlink control information (DCI) carried by one or more physical downlink control channels (PDCCHs) transmitted on a downlink component carrier Y from a base station, wherein each of the one or more pieces of DCI includes a transmission power control (TPC) command field, scheduling information for a physical downlink shared channel (PDSCH), and is transmitted through a PDCCH corresponding to the PDSCH; determining, by the UE device, that a first command indicated by a fist TPC command field in at least one piece of the one or more pieces of DCI is an ACK resource indication (ARI) command if the downlink component carrier Y is a non-system-linked downlink component carrier of the uplink component carrier X, wherein the ARI command indicates which resource of a group of uplink ACK channel resources assigned through a higher-layer signaling are to be used to feed back ACK/NACK information, and determining that a second command indicated by a second TPC command field in at least one piece of the one or more pieces of DCI is a TPC command if the downlink component carrier Y is a system-linked downlink component carrier of the uplink component carrier X; and feeding back, by the UE, ACK/NACK information through the uplink component carrier X according to the determined command. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A User equipment (UE), that feedbacks Acknowledgement/Negative-acknowledgement (ACK/NACK) information for carrier aggregation through an uplink component carrier X, the UE comprising:
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a receiver, configured to receive one or more pieces of downlink control information (DCI) carried by one or more physical downlink control channels (PDCCHs) transmitted on a downlink component carrier Y from a base station, wherein each of the one or more pieces of DCI includes a transmission power control (TPC) command field, carries scheduling information for a physical downlink shared channel (PDSCH) respectively, and is transmitted through a PDCCH corresponding to the PDSCH respectively; a processor, configured to determine that a first command indicated by a first TPC command field in at least one piece of the one or more pieces of DCI is an ACK resource indication (ARI) command if the downlink component carrier Y is a non-system-linked downlink component carrier of the uplink component carrier X, wherein the ARI command indicates which resource of a group of uplink ACK channel resources assigned through a higher-layer signaling are to be used to feed back ACK/NACK information, and determining that a second command indicated by a second TPC command field in at least one piece of the one or more pieces of DCI is a TPC command if the downlink component carrier Y is a system-linked downlink component carrier of the uplink component carrier X; and a transmitter, configured to feed back Acknowledgement/Negative-acknowledgement (ACK/NACK) information through an uplink component carrier X according to the determined command. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification