Method and apparatus for handling random access channel responses
AssigneeInterDigital Patent Holdings, Inc.
InventorsKalpendu R. Pasad, Shankar Somasundaram, Jin Wang
Life of this patent
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Abstract
A method and apparatus for supporting a random access using a random access channel (RACH) are disclosed. The WTRU detects a format of control information in at least one control channel element (CCE) of a common area in a control portion of a downlink transmission. The control information indicates a resource allocation in a data portion of the downlink transmission. The WTRU recovers a random access response assigned to the WTRU from the indicated resource allocation of the data portion on a condition that the at least one CCE has a random access radio network terminal identifier (RA-RNTI) assigned to the WTRU.
Claims20
A wireless transmit/receive unit (WTRU) comprising a processor configured to:
- transmit a random access preamble;
- receive a downlink transmission, wherein the downlink transmission comprises a physical downlink control channel (PDCCH), the PDCCH comprises a plurality of control channel elements (CCEs), and a subset of the plurality of CCEs correspond to a common portion of the PDCCH;
- perform blink decoding within the subset of the plurality of CCEs to detect downlink control information intended for the WTRU, wherein the downlink control information comprises a resource allocation to be used for receiving a random access channel (RACH) response in a physical downlink shared channel (PDSCH) comprised in the downlink transmission;
- and
- process the RACH response in the PDSCH in accordance with the resource allocation.
A method performed by a wireless transmit/receive unit (WTRU), the method comprising:
- transmitting a random access preamble;
- receiving a downlink transmission, wherein the downlink transmission comprises a physical downlink control channel (PDCCH), the PDCCH comprises a plurality of control channel elements (CCEs), and a subset of the plurality of CCEs correspond to a common portion of the PDCCH;
- performing blind decoding within the subset of the plurality of CCEs to detect downlink control information intended for the WTRU, wherein the downlink control information comprises a resource allocation to be used for receiving a random access channel (RACH) response in a physical downlink shared channel (PDSCH) comprised in the downlink transmission;
- and
- processing the RACH response in the PDSCH in accordance with the resource allocation.
The method of claim wherein the subset of the plurality of CCEs comprise transport format information.
The method of claim wherein the subset of the plurality of CCEs are spread in the time-frequency domain.
Dependencies are inferred from the claim text.