Method and apparatus for random access in multicarrier wireless communications
First Claim
1. A method performed by an evolved NodeB (eNodeB), the method comprising:
- transmitting a physical downlink control channel (PDCCH) order for a random access procedure, wherein the PDCCH order includes a carrier indicator field (CIF) indicating a component carrier, selected from a plurality of component carriers, via which a wireless transmit/receive unit (WTRU) is to transmit a random access preamble, wherein the component carrier indicated by the CIF is a member of a group of component carriers of the plurality of component carriers, and further wherein the group of component carriers have a same timing alignment (TA);
receiving the random access preamble on the component carrier indicated by the CIF in response to the PDCCH order;
transmitting a random access response (RAR) on a primary downlink component carrier in response to the random access preamble, wherein the RAR includes a timing advance used to adjust uplink transmission timing via any component carrier of the group of component carriers.
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Abstract
Methods and apparatus for random access in multicarrier wireless communications are disclosed. Methods and apparatus are provided for physical random access channel (PRACH) resource signaling, PRACH resource handling, preamble and PRACH resource selection, random access response (RAR) reception, preamble retransmission, and transmission and reception of subsequent messages. A method for maintaining an allowed multicarrier uplink (UL) random access channel (RACH) configuration set by adding an UL carrier to the allowed RACH configuration set provided that a triggering event occurs and performing a random access (RA) procedure using the allowed RACH configuration set. A method for sending data in multicarrier wireless communications by determining a set of available UL carriers and selecting an UL carrier from the set of available UL carriers.
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Citations
20 Claims
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1. A method performed by an evolved NodeB (eNodeB), the method comprising:
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transmitting a physical downlink control channel (PDCCH) order for a random access procedure, wherein the PDCCH order includes a carrier indicator field (CIF) indicating a component carrier, selected from a plurality of component carriers, via which a wireless transmit/receive unit (WTRU) is to transmit a random access preamble, wherein the component carrier indicated by the CIF is a member of a group of component carriers of the plurality of component carriers, and further wherein the group of component carriers have a same timing alignment (TA); receiving the random access preamble on the component carrier indicated by the CIF in response to the PDCCH order; transmitting a random access response (RAR) on a primary downlink component carrier in response to the random access preamble, wherein the RAR includes a timing advance used to adjust uplink transmission timing via any component carrier of the group of component carriers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wireless transmit/receive unit (WTRU), the WTRU comprising:
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a processor; a receiver operably coupled to the processor, the receiver and processor configured to receive downlink control information (DCI); and a transmitter operably coupled to the processor, the transmitter and processor configured in response to the DCI to transmit a random access preamble on a secondary uplink component carrier selected from a plurality of component carriers; wherein the receiver and processor are further configured to receive a random access response (RAR) always on a primary downlink component carrier in response to the random access preamble; and wherein the receiver and processor are further configured to receive downlink transmissions via the primary downlink component carrier and one or more secondary component carriers. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method performed by a wireless transmit/receive unit (WTRU), the method comprising:
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receiving downlink control information (DCI); transmitting, in response to receiving the DCI, a random access preamble on a secondary uplink component carrier selected from a plurality of component carriers; receiving a random access response (RAR) always on a primary downlink component carrier in response to the random access preamble; and receiving downlink transmissions via the primary downlink component carrier and one or more secondary component carriers. - View Dependent Claims (17, 18, 19, 20)
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Specification