Control channel signaling and acquisition for carrier aggregation
First Claim
Patent Images
1. A method implemented by a wireless transmit/receive unit (WTRU) for performing carrier aggregation, the method comprising:
- receiving carrier aggregation information applicable to a second component carrier in a radio resource control (RRC) message sent via a first component carrier, wherein the carrier aggregation information indicates that downlink grants for downlink transmissions received via the second component carrier will be scheduled via a physical downlink control channel (PDCCH) transmitted on the first component carrier;
decoding a PDCCH transmission on the first component carrier;
determining whether downlink control information included in the PDCCH transmission is applicable to the first component carrier or the second component carrier based on a carrier index included in the PDCCH transmission, the carrier index indicating that the downlink control information is applicable to the second component carrier; and
receiving a downlink transmission via the second component carrier using the downlink control information received via the PDCCH transmission included on the first component carrier.
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Abstract
A method and apparatus for handling a control channel for carrier aggregation in wireless communications. The method includes determining which component carrier to listen to, detecting the downlink control channel, processing mapping information related to downlink and uplink transmissions and operating discontinuous reception with respect to carrier aggregation. The method also includes detecting a component carrier, determining the component carrier type and locating the anchor component carrier, if necessary, where the anchor component carrier carries the carrier aggregation information.
38 Citations
20 Claims
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1. A method implemented by a wireless transmit/receive unit (WTRU) for performing carrier aggregation, the method comprising:
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receiving carrier aggregation information applicable to a second component carrier in a radio resource control (RRC) message sent via a first component carrier, wherein the carrier aggregation information indicates that downlink grants for downlink transmissions received via the second component carrier will be scheduled via a physical downlink control channel (PDCCH) transmitted on the first component carrier; decoding a PDCCH transmission on the first component carrier; determining whether downlink control information included in the PDCCH transmission is applicable to the first component carrier or the second component carrier based on a carrier index included in the PDCCH transmission, the carrier index indicating that the downlink control information is applicable to the second component carrier; and receiving a downlink transmission via the second component carrier using the downlink control information received via the PDCCH transmission included on the first component carrier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A wireless transmit/receive unit (WTRU) comprising a processor configured to:
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receive carrier aggregation information applicable to a second component carrier in a radio resource control (RRC) message sent via a first component carrier, wherein the carrier aggregation information indicates that downlink grants for downlink transmissions received via the second component carrier will be scheduled via a physical downlink control channel (PDCCH) transmitted on the first component carrier; decode a PDCCH transmission on the first component carrier; determine whether downlink control information included in the PDCCH transmission is applicable to the first component carrier or the second component carrier based on a carrier index included in the PDCCH transmission, the carrier index indicating that the downlink control information is applicable to the second component carrier; and receive a downlink transmission via the second component carrier using the downlink control information received via the PDCCH transmission included on the first component carrier. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification