Control channel signaling and acquisition for carrier aggregation
First Claim
Patent Images
1. A method implemented by a wireless transmit/receive unit (WTRU), the method comprising:
- receiving a first radio resource control (RRC) message comprising carrier aggregation information, the carrier aggregation information comprising an indication that downlink control information for downlink transmissions on a first component carrier will be received via a second component carrier, wherein the WTRU receives, via the second component carrier, an indication of which orthogonal frequency division multiplexing (OFDM) symbols of a subframe include a physical downlink shared channel (PDSCH) region for the WTRU to decode the downlink transmissions on the first component carrier;
receiving a physical downlink control channel (PDCCH) transmission on the second component carrier, wherein the PDCCH transmission comprises a downlink grant and an index indicating which component carrier is to be used for carrying a physical downlink shared channel (PDSCH) transmission associated with the downlink grant;
determining the PDSCH transmission is to be received on the first component carrier based on the index included in the PDCCH transmission received on the second component carrier; and
receiving the PDSCH transmission on the first component carrier in accordance with the downlink grant included in the PDCCH transmission received on the second 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.
33 Citations
20 Claims
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1. A method implemented by a wireless transmit/receive unit (WTRU), the method comprising:
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receiving a first radio resource control (RRC) message comprising carrier aggregation information, the carrier aggregation information comprising an indication that downlink control information for downlink transmissions on a first component carrier will be received via a second component carrier, wherein the WTRU receives, via the second component carrier, an indication of which orthogonal frequency division multiplexing (OFDM) symbols of a subframe include a physical downlink shared channel (PDSCH) region for the WTRU to decode the downlink transmissions on the first component carrier; receiving a physical downlink control channel (PDCCH) transmission on the second component carrier, wherein the PDCCH transmission comprises a downlink grant and an index indicating which component carrier is to be used for carrying a physical downlink shared channel (PDSCH) transmission associated with the downlink grant; determining the PDSCH transmission is to be received on the first component carrier based on the index included in the PDCCH transmission received on the second component carrier; and receiving the PDSCH transmission on the first component carrier in accordance with the downlink grant included in the PDCCH transmission received on the second 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) configured, at least in part, to:
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receive a first radio resource control (RRC) message comprising carrier aggregation information, the carrier aggregation information comprising an indication that downlink control information for downlink transmissions on a first component carrier will be received via a second component carrier, wherein the WTRU is configured to receive, via the second component carrier, an indication of which orthogonal frequency division multiplexing (OFDM) symbols of a subframe include a physical downlink shared channel (PDSCH) region for the WTRU to decode the downlink transmissions on the first component carrier; receive a physical downlink control channel (PDCCH) transmission on the second component carrier, wherein the PDCCH transmission comprises a downlink grant and an index indicating which component carrier is to be used for carrying a PDSCH transmission associated with the downlink grant; determine the PDSCH transmission is to be received on the first component carrier based on the index included in the PDCCH transmission received on the second component carrier; and receive the PDSCH transmission on the first component carrier in accordance with the downlink grant included in the PDCCH transmission received on the second component carrier. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A base station configured, at least in part, to:
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determine that downlink control information for a first component carrier is to be transmitted to a wireless transmit receive unit (WTRU) using a physical downlink control channel (PDCCH) of a second component carrier; send a first radio resource control (RRC) message comprising carrier aggregation information to the WTRU, the carrier aggregation information comprising an indication that the downlink control information for downlink transmissions on the first component carrier will be sent to the WTRU via the PDCCH of the second component carrier, wherein the base station is configured to send, via the second component carrier, an indication of which orthogonal frequency division multiplexing (OFDM) symbols of a subframe include a physical downlink shared channel (PDSCH) region for the WTRU to decode the downlink transmissions on the first component carrier; send a PDCCH transmission to the WTRU on the second component carrier, the PDCCH transmission comprising a downlink grant and an index indicating which component carrier is to be used for carrying a PDSCH transmission associated with the downlink grant, wherein the index included in the PDCCH transmission indicates that the first component carrier is to be used by the WTRU for receiving the PDSCH transmission associated with the downlink grant; and receive the PDSCH transmission on the first component carrier in accordance with the downlink grant included in the PDCCH transmission received on the second component carrier. - View Dependent Claims (18, 19, 20)
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Specification